Maintenance-free combined bellows sleeve compensator

Abstract

The present invention relates to the technical field of pipeline compensators, and discloses a maintenance-free combined bellows sleeve compensator, comprising connecting flanges at both ends, a bellows connected between the two connecting flanges, the two connecting flanges respectively connecting a first pipe for the medium to flow upstream and a second pipe for the medium to flow downstream, a built-in pressure-bearing mechanism provided in the bellows, an external pressure-bearing detection mechanism provided on the outside of the bellows, at least one group of composite compensating mechanisms connected to the two pipes, and a balancing mechanism provided between the composite compensating mechanism and the two flanges. The beneficial effects of the present invention are as follows: the radial medium pressure of the bellows can be shared, the axial expansion and contraction pressure of the bellows can be shared by providing an external pressure-bearing detection mechanism, and the service life of the bellows can be extended to a certain extent. The bellows can also be detected to see if it is leaking. If there is a leak, the flow pipeline is changed to avoid interruption, and the balancing mechanism as a whole extends the service life of the compensator.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline compensators, and in particular to a maintenance-free combined corrugated sleeve compensator. Background Art

[0002] A pipe compensator is a device used in piping systems to address elongation, contraction, deflection, and deformation caused by temperature fluctuations, installation errors, and pipeline vibration during operation. Also known as an expansion joint or bellows expansion joint, it is primarily used to compensate for thermal expansion and contraction caused by temperature fluctuations in pipes.

[0003] The compensator in the prior art generally includes a flange for connecting the pipes at both ends, and a bellows is arranged between the flanges. The expansion and contraction of the pipe is compensated by the expansion and contraction of the bellows. During the construction of municipal public works, especially the construction of municipal heating pipes, we found that the above-mentioned compensator, after a period of use, especially during the heating season, has a large temperature change, resulting in frequent expansion and contraction of the bellows, which easily causes the compensator to leak and reduces its service life. Once the compensator leaks, it will cause the entire heating pipeline to be broken, and the heating must be stopped and repaired, which affects the use and increases the difficulty of maintenance. Summary of the Invention

[0004] The main inventive concept of the present invention is as follows: changing the internal and external structures of the existing compensator, reducing its expansion and contraction pressure, and extending its service life. At the same time, if a compensator leaks, it can automatically change the route without interrupting the flow of the pipeline and affecting the normal use of the pipeline.

[0005] To this end, the present invention proposes a maintenance-free combined corrugated sleeve compensator. Compared with the existing technology, during normal use, it connects multiple paths to divert the medium, sharing the expansion and contraction of the compensator in the existing technology. At the same time, it can protect the structure of the compensator itself and extend its service life. When leakage occurs, it can automatically switch the path to avoid pipeline interruption.

[0006] The technical solution adopted according to the above-mentioned inventive concept is as follows: a maintenance-free combined bellows sleeve compensator, including connecting flanges at both ends, a bellows connected between the two connecting flanges, the two connecting flanges respectively connected to a first pipe for medium flow upstream and a second pipe for medium flow downstream, a built-in pressure-bearing mechanism provided in the bellows, an external pressure-bearing detection mechanism provided on the outside of the bellows, and at least one group of composite compensation mechanisms connected between the two first pipes and the second pipes, and a balancing mechanism arranged between the composite compensation mechanism and the two connecting flanges.

[0007] By adopting the above technical solution: the connecting flanges at both ends are used to connect the first pipeline and the second pipeline, and by setting a built-in pressure-bearing mechanism, the radial medium pressure of the bellows can be shared, which can extend the service life of the bellows to a certain extent. By setting an external pressure-bearing detection mechanism, firstly, the axial expansion and contraction pressure of the bellows can be shared, which also extends the service life of the bellows to a certain extent. Secondly, it can detect whether the bellows is leaking. If there is a leakage, it will immediately respond to the controller and completely switch to the composite compensation mechanism to change the circulation pipeline to prevent the pipe from bursting. At the same time, it can continue to transport the medium and avoid the problem of pipeline interruption. The balancing mechanism can balance the forces between the composite compensation mechanism and the bellows to prevent a single mechanism from being subjected to too much force and causing premature damage, thereby extending the service life of the compensator as a whole.

[0008] Preferably, the built-in pressure-bearing mechanism includes a built-in tube arranged inside the bellows, the outer wall of the built-in tube is close to the inner wall of the bellows, one end of the built-in tube facing the flow direction of the medium is welded to the end of the bellows, and the other end is slidably connected to the end of the bellows through a sealing rubber ring.

[0009] By adopting the above technical solution: the built-in tube is a round tube. In actual use, the medium flows through the round tube. The upstream end of the medium flow direction is fixed by welding, and the other side is sealed and slidably connected to the corrugated end by a sealing rubber ring, which shares the pressure of the corrugated section of the bellows that directly contacts the medium. The setting of the built-in tube means that the bellows does not contact the medium during the front period of using the compensator, which can extend its service life. Only when the sealing rubber ring fails can the medium contact the bellows, but the medium pressure is still mainly borne by the built-in tube, which further extends the service life of the bellows. Only when the bellows has been used for a long time may leakage occur. At this time, the outer periphery of the bellows can be protected by the external pressure detection mechanism, which can further reduce the expansion and contraction force of the bellows and temporarily prevent the pipe from bursting. At this time, the pipeline can be switched through the controller so that the medium no longer passes through the bellows and continues to circulate in a different route to prevent pipeline interruption.

[0010] Preferably, the external pressure detection mechanism includes sealing ring sleeves sleeved on both ends of the bellows, a telescopic tube is provided between the two sealing ring sleeves, and a detection component is provided on one of the sealing ring sleeves.

[0011] By adopting the above technical solution: the telescopic tube sleeve is arranged on the outside of the bellows, and the two ends are sealed and fixedly connected with the sealing ring sleeve to form a closed space with the outer wall of the bellows. When the bellows leaks, the medium is in this closed space. After the medium signal is detected by the detection component, it is used as a driving signal to change the medium flow direction of the pipeline through the controller to prevent large-scale leakage from causing pipe burst.

[0012] Preferably, the detection component includes a medium leakage detector, the medium leakage detector is communicatively connected to a controller, and the controller controls a multi-way solenoid valve connected to the first pipeline.

[0013] By adopting the above technical solution: the medium leakage detector can detect whether there is medium inside the closed cavity. When the presence of medium is detected, the signal is transmitted to the controller. The controller can control the multi-way solenoid valve, close the channel of the bellows, and completely redirect the medium to the composite compensation mechanism for continued circulation, avoiding the problem of medium flow interruption.

[0014] Preferably, the composite compensation mechanism includes a compensation pipeline having one end connected to the multi-way solenoid valve, and the other end of the compensation pipeline is connected to the second pipeline through a connecting vessel.

[0015] By adopting the above technical solution: under normal circumstances, the medium circulates through the compensation pipe and the bellows dual channels, which can reduce the pressure of a single bellows circulation and extend its service life.

[0016] Preferably, the compensation pipeline includes a first curved pipe portion communicating with the multi-way solenoid valve and a second curved pipe portion communicating with the second pipeline, and also includes a straight pipe portion communicating with the first curved pipe portion and the second curved pipe portion.

[0017] Preferably, both the first curved tube portion and the second curved tube portion are elastic.

[0018] By adopting the above technical solution: the first curved pipe part and the second curved pipe part are both elastic and can bend, so that they can expand and contract simultaneously with the bellows, sharing the pressure of the bellows expanding and contracting alone. When the bellows leaks, the controller can be used to completely close the channel of the bellows, and the medium can be diverted to the compensation pipeline to continue flowing, preventing the entire pipeline from being interrupted.

[0019] Preferably, the balancing mechanism is arranged between the straight pipe portion and the two connecting flanges, and includes an intermediate component and a plurality of telescopic components.

[0020] By adopting the above technical solution: by setting up a balancing mechanism, the expansion and contraction of the compensation pipeline and the bellows can be coordinated, so that the compensation pipeline and the bellows can expand and contract basically synchronously, balancing their respective expansion and contraction pressures, expanding and contracting more evenly, and improving the service life of both.

[0021] Preferably, the intermediate component is provided with at least three hinged parts, which are respectively rotatably connected to one end of the first telescopic part, the second telescopic part and the third telescopic part. The other end of the first telescopic part is rotatably connected to the fixing ring on the straight pipe part, and the second telescopic part and the third telescopic part are respectively rotatably connected to the two connecting flanges.

[0022] By adopting the above technical solution: through the intermediate component and the above multiple telescopic parts, the expansion and contraction between the compensation pipe, especially the first curved pipe part, the second curved pipe part and the bellows, can be achieved, so that the first curved pipe part, the second curved pipe part and the bellows can expand and contract basically synchronously.

[0023] Preferably, the first telescopic member, the second telescopic member and the third telescopic member are tension springs, the intermediate member is a circular plate, and the hinged portion is a through hole provided on the circular plate for hanging the tension springs.

[0024] By adopting the above technical solution, the first curved tube part, the second curved tube part and the bellows can be pulled together by the tension spring, and can be expanded and contracted in a basically balanced and synchronous manner.

[0025] Preferably, the first telescopic member, the second telescopic member and the third telescopic member are telescopic rods, the intermediate member is a circular plate, and the hinged portion is a hinged shaft fixed on the circular plate for hingedly connecting the telescopic rods.

[0026] By adopting the above technical solution, the telescopic rod has basically the same function as the tension spring, so that the first curved tube part, the second curved tube part and the bellows can be pulled together and telescoped in a basically balanced and synchronous manner.

[0027] Preferably, the composite compensation mechanism is provided with two groups, and the controllers therein are communicatively connected to the control center.

[0028] By adopting the above technical solution, at least three groups of medium circulation channels can be formed. Under normal circumstances, the three groups of channels are used for medium circulation at the same time. When the bellows channel leaks, the other two compensation pipelines can be used for circulation to avoid interruption of the entire circulation pipeline.

[0029] The working principle and beneficial effects of the present invention are:

[0030] 1. The connecting flanges at both ends of the present invention are used to connect the first pipe and the second pipe. By setting a built-in pressure-bearing mechanism, the radial medium pressure of the bellows can be shared, and the service life of the bellows can be extended to a certain extent. By setting an external pressure-bearing detection mechanism, firstly, the axial expansion and contraction pressure of the bellows can be shared, and the service life of the bellows can be extended to a certain extent. Secondly, it can detect whether the bellows is leaking. If there is a leakage, the controller will immediately respond and completely switch to the composite compensation mechanism to change the circulation pipeline to prevent the pipe from bursting. At the same time, the medium can continue to be transported, avoiding the problem of pipeline interruption. The balancing mechanism can balance the forces between the composite compensation mechanism and the bellows, preventing a single mechanism from being subjected to large forces and causing premature damage, thereby extending the service life of the compensator as a whole.

[0031] 2. The built-in tube in the present invention is a round tube. In actual use, the medium flows through the round tube. The upstream end of the medium flow direction is fixed by welding, and the other side is sealed and slidably connected to the corrugated end by a sealing rubber ring, which shares the pressure of the corrugated section of the bellows that directly contacts the medium. The setting of the built-in tube ensures that the bellows does not contact the medium during the front period of using the compensator, which can extend its service life. Only when the sealing rubber ring fails can the medium contact the bellows, but the medium pressure is still mainly borne by the built-in tube, which further extends the service life of the bellows. Only when the bellows has been used for a long time may leakage occur. At this time, the outer periphery of the bellows can be protected by the external pressure detection mechanism, which can further reduce the expansion and contraction force of the bellows and temporarily prevent the pipe from bursting. At this time, the pipeline can be switched by the controller so that the medium no longer passes through the bellows and continues to circulate in a different route to prevent pipeline interruption.

[0032] 3. The medium leakage detector in the present invention can detect whether there is medium inside the closed cavity. When the presence of medium is detected, the signal is transmitted to the controller. The controller can control the multi-way solenoid valve to close the channel of the bellows and completely redirect the medium to the composite compensation mechanism for continued circulation, thereby avoiding the problem of medium flow interruption.

[0033] 4. The first curved pipe portion and the second curved pipe portion are both elastic and bendable, so they can expand and contract simultaneously with the bellows, sharing the pressure of the bellows expanding and contracting alone. When the bellows leaks, the controller can completely close the channel of the bellows, and the medium is diverted to the compensation pipeline to continue flowing, preventing the entire pipeline from being interrupted.

[0034] 5. In another embodiment of the present invention, at least three groups of medium circulation channels can be formed. Under normal circumstances, the three groups of channels are used for medium circulation at the same time. When the bellows channel leaks, the other two compensation pipelines can be used for circulation to avoid interruption of the entire circulation pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 Schematic diagram of the external overall structure of the first embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the internal structure of the bellows according to the first embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the overall internal structure of the first embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the external structure of the first embodiment of the present invention (including a set of balancing mechanisms);

[0040] Figure 5 Schematic diagram of the external structure of the second embodiment of the present invention (including two sets of balancing mechanisms).

[0041] The various features in the drawings are marked as follows:

[0042] 100, connecting flange; 200, bellows; 300, first pipeline; 400, second pipeline; 500, built-in pressure-bearing mechanism; 510, built-in pipe; 520, sealing rubber ring; 600, external pressure-bearing detection mechanism; 610, sealing ring sleeve; 620, telescopic tube; 630, medium leakage detector; 640, controller; 650, multi-way solenoid valve; 700, composite compensation mechanism; 710, compensation pipeline; 711, first curved pipe part; 712, second curved pipe part; 713, straight pipe part; 720, communicating vessel; 800, balancing mechanism; 810, intermediate component; 820, hinged part; 830, first telescopic member; 840, second telescopic member; 850, third telescopic member; 860, fixing ring. DETAILED DESCRIPTION

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0044] The present invention includes two specific embodiments, but is certainly not limited to the following specific embodiments. It mainly lies in the inventive concept of the present invention. The main inventive concept of the present invention as a whole is as follows: changing the internal and external structures of the existing compensator, reducing its expansion and contraction pressure, and extending its service life. At the same time, if a compensator leaks, it can automatically change the route without interrupting the flow of the pipeline and affecting the normal use of the pipeline.

[0045] To this end, the present invention specifically provides the following two embodiments, which are as follows:

[0046] Example 1:

[0047] Reference Figures 1-4 This embodiment proposes the following maintenance-free combined corrugated sleeve compensator. Compared with the existing technology, during normal use, it connects multiple paths to divert the medium, sharing the expansion and contraction of the compensator in the existing technology. At the same time, it can protect the structure of the compensator itself and extend its service life. When leakage occurs, it can automatically switch the path to avoid pipeline interruption.

[0048] The technical solution adopted according to the above-mentioned inventive concept is as follows: a maintenance-free combined corrugated sleeve compensator, including connecting flanges 100 at both ends. The two connecting flanges 100 are mainly used for docking the compensator with the conveying pipeline. On the entire conveying pipeline, according to the specifications and standards, it is necessary to install the compensator in the conveying pipeline at a certain distance. Therefore, the above-mentioned two connecting flanges 100 are connected to the pipeline at the location where the compensator is installed. In the prior art, a bellows 200 is connected between the two connecting flanges 100. The two connecting flanges 100 are respectively connected to the first pipeline 300 for the medium to flow upstream and the second pipeline 400 for the medium to flow downstream. Here, the first pipeline 300 and the second pipeline 400 are actually the locations where the compensator is installed. The pipes on both sides of the position, of course, the first pipe 300 and the second pipe 400 are only distinguished as a schematic diagram of the installation, and there is no actual difference. A built-in pressure-bearing mechanism 500 is provided in the bellows 200 to share the internal pressure of the bellows 200, and an external pressure-bearing detection mechanism 600 is provided on the outside of the bellows 200. While sharing the medium pressure, it detects whether there is a medium leakage. If there is a leakage, it communicates to the controller 640 to take favorable measures. This embodiment also includes at least one group of composite compensation mechanisms 700 connected to the two first pipes 300 and the second pipe 400, and a balancing mechanism 800 arranged between the composite compensation mechanism 700 and the two connecting flanges 100. This embodiment takes a group of composite compensation mechanisms 700 as an example.

[0049] The basic principle of this embodiment: the connecting flanges 100 at both ends are used to connect the first pipe 300 and the second pipe 400. By setting up a built-in pressure-bearing mechanism 500, the radial medium pressure of the bellows 200 can be shared, and the service life of the bellows 200 can be extended to a certain extent. By setting up an external pressure-bearing detection mechanism 600, firstly, the axial expansion and contraction pressure of the bellows 200 can be shared, and the service life of the bellows 200 can be extended to a certain extent. Secondly, it can detect whether the bellows 200 is leaking. If there is a leakage, it will immediately respond to the controller 640 and completely switch to the composite compensation mechanism 700 to change the circulation pipeline. While preventing the pipe from bursting, it can also continue to transport the medium and avoid the problem of pipeline interruption. The balancing mechanism 800 can balance the forces between the composite compensation mechanism 700 and the bellows 200, preventing a single mechanism from being subjected to too much force and causing premature damage, thereby extending the service life of the compensator as a whole.

[0050] Reference Figure 2 and Figure 3The built-in pressure-bearing mechanism 500 in this embodiment includes a built-in tube 510 arranged inside the bellows 200, the outer wall of the built-in tube 510 is close to the inner wall of the bellows 200, and the end of the built-in tube 510 facing the medium flow direction is welded to the end of the bellows 200. The welding protrusion can disturb the medium, and impurities in the medium are not easy to stay in the bellows 200 section. The other end of the built-in tube 510 is slidably connected to the end of the bellows 200 through a sealing rubber ring 520. When pipeline compensation is required, the built-in tube 510 can move inside the bellows 200 to compensate for the expansion and contraction. The sealing rubber ring 520 can prevent the medium from entering between the bellows 200 and the built-in tube 510 as much as possible. The built-in tube 510 is a round tube. In actual use, the medium flows through the round tube, and its upstream end in the medium flow direction is fixed by welding, and the other side is fixed with sealing glue. The ring 520 is connected to the corrugated end in a sealed sliding manner, sharing the pressure of the direct contact medium at the corrugated section of the bellows 200. The setting of the built-in tube 510 means that the bellows 200 does not contact the medium during the front period of using the compensator, which can extend its service life. Only when the sealing rubber ring 520 fails can the medium contact the bellows, but the medium pressure is still mainly borne by the built-in tube 510, further extending the service life of the bellows 200. Only when the bellows 200 has been used for a long time may leakage occur. At this time, the outer periphery of the bellows 200 can be protected by the external pressure detection mechanism 600, which can further reduce the expansion and contraction force of the bellows 200 and temporarily prevent the pipe from bursting. At this time, the pipeline can also be switched through the controller 640 so that the medium no longer passes through the bellows 200 and continues to circulate by a different route to prevent pipeline interruption.

[0051] The above description is about sharing the medium pressure inside the bellows 200, that is, the improvement made from the inside of the bellows 200. In order to further extend the service life of the bellows 200, we consider sharing the telescopic displacement outside the bellows 200, and even consider changing the signal source problem of the medium channel while sharing the pressure of the bellows 200. In this way, the synergistic realization of killing two birds with one stone is achieved. This embodiment also provides an external pressure detection mechanism 600, which includes a sealing ring sleeve 610 set at both ends of the bellows 200, and a telescopic tube 620 is provided between the two sealing ring sleeves 610. The telescopic tube 620 can be made of high-toughness rubber material. It is sleeve-shaped, has a certain elasticity, can be expanded and contracted, and expands and contracts synchronously with the bellows 200 to reduce the axial expansion and contraction pressure of the bellows 200. A detection component is provided on one of the sealing ring sleeves 610 to detect whether there is a medium leakage. In practice, the expansion tube 620 is sleeved on the outside of the bellows 200, and the two ends are sealed and fixedly connected to the sealing ring sleeve 610 to form a closed space. When the bellows 200 leaks, the medium is in this closed space. After the medium signal is detected by the detection component, it is used as a driving signal to change the medium flow direction of the pipeline through the controller 640 to prevent large-scale leakage from causing pipe burst.

[0052] Reference Figure 2 and Figure 3 Specifically, the detection component in this embodiment includes a medium leakage detector 630, which uses a liquid medium sensor to sense whether there is a liquid medium. The medium leakage detector 630 is communicatively connected to the controller 640. The controller 640 controls the multi-way solenoid valve 650 connected to the first pipeline 300. Each compensator is provided with a controller 640. The controllers 640 of multiple compensators have a single identification for the current compensator. Multiple controllers 640 can be networked to the main control center, and the main control center can display the working status of each compensator. The medium leakage detector 630 can detect whether there is a medium inside the closed cavity. When the presence of the medium is detected, the signal is transmitted to the controller 640. The controller 640 can control the multi-way solenoid valve 650, close the channel of the bellows 200, and completely redirect it to the composite compensation mechanism 700 to continue circulation, thereby avoiding the problem of medium circulation interruption.

[0053] Reference Figure 2 and Figure 3To balance the medium pressure and expansion of bellows 200, a composite compensation mechanism 700 is provided on bellows 200. Specifically, in this embodiment, composite compensation mechanism 700 includes a compensation line 710 connected to multi-way solenoid valve 650 at one end, and the other end of compensation line 710 communicates with second pipeline 400 via a connecting piece 720. Under normal circumstances, the medium flows through both compensation line 710 and bellows 200, reducing the pressure flowing through a single bellows 200 and extending its service life.

[0054] Of course, the compensation pipeline 710 should also have a certain amount of expansion and contraction. Therefore, the compensation pipeline 710 in this embodiment includes a first curved pipe portion 711 connected to the multi-way solenoid valve 650 and a second curved pipe portion 712 connected to the second pipeline 400. It also includes a straight pipe portion 713 connecting the first curved pipe portion 711 and the second curved pipe portion 712. The first curved pipe portion 711 and the second curved pipe portion 712 are both elastic, that is, they can move closer to or farther away from each other relative to the straight pipe portion 713, forming a certain amount of expansion and contraction.

[0055] Reference Figure 2 and Figure 3 Specifically, the first curved tube portion 711 and the second curved tube portion 712 are both elastic and can bend, so that they can expand and contract simultaneously with the bellows 200, sharing the pressure of the bellows 200 expanding and contracting alone. When the bellows 200 leaks, the controller 640 can completely close the channel of the bellows 200, and the medium can be diverted to the compensation pipeline 710 to continue flowing, preventing the entire pipeline from being interrupted.

[0056] Reference Figure 4 To ensure synchronous expansion and contraction of the compensating pipe and the bellows 200, and to prevent the expansion and contraction from being solely loaded on the compensating pipe 710 or the bellows 200, this embodiment further provides a balancing mechanism 800. This balancing mechanism 800 is disposed between the straight pipe portion 713 and the two flanges and comprises an intermediate component 810 and a plurality of expansion and contraction components. The provision of the balancing mechanism 800 coordinates the expansion and contraction of the compensating pipe 710 and the bellows 200, allowing them to expand and contract essentially synchronously, balancing their respective expansion and contraction pressures and achieving more uniform expansion and contraction, thereby increasing the service life of both.

[0057] In this embodiment, at least three hinged parts 820 are provided on the intermediate component 810, which are respectively rotatably connected to one end of the first telescopic component 830, the second telescopic component 840 and the third telescopic component 850. The other end of the first telescopic component 830 is rotatably connected to the fixing ring 860 on the straight pipe portion 713, and the second telescopic component 840 and the third telescopic component 850 are respectively rotatably connected to the two flanges. Through the intermediate component 810 and the above-mentioned multiple telescopic components, the compensation pipeline, especially the expansion and contraction between the first curved pipe portion 711, the second curved pipe portion 712 and the bellows 200, can be made so that the first curved pipe portion 711, the second curved pipe portion 712 and the bellows 200 can be basically expanded and contracted synchronously.

[0058] The first telescopic member 830, the second telescopic member 840 and the third telescopic member 850 are tension springs, the intermediate member 810 is a circular plate, and the hinge portion 820 is a through hole opened on the circular plate for hanging the tension spring. The tension spring can make the first curved tube portion 711, the second curved tube portion 712 and the bellows 200 entangled with each other, and basically balance and synchronize the expansion and contraction.

[0059] The first telescopic member 830, the second telescopic member 840 and the third telescopic member 850 are telescopic rods, the intermediate member 810 is a circular plate, and the hinge portion 820 is a hinge shaft fixed on the circular plate for hingedly connecting the telescopic rods. The telescopic rods have basically the same function as the above-mentioned tension springs, which can make the first curved tube portion 711, the second curved tube portion 712 and the bellows 200 mutually entangled, and basically balanced and synchronously extend and retract.

[0060] Example 2:

[0061] Reference Figure 4The maintenance-free combined bellows sleeve compensator proposed in this embodiment includes connecting flanges 100 at both ends. The two flanges are mainly used to connect to the butt joints of the pipeline. On the entire transmission pipeline, according to the specifications and standards, it is necessary to install a compensator in the pipeline at a certain distance. Therefore, the above-mentioned two flanges are connected to the pipeline at the location where the compensator is installed. In the prior art, a bellows 200 is connected between the two connecting flanges 100. The two connecting flanges 100 are respectively connected to the first pipe 300 where the medium flows upstream and the second pipe 400 where the medium flows downstream. Here, the first pipe 300 and the second pipe 400 are actually the locations where the compensator is installed. The pipes on both sides of this position, of course, the first pipe 300 and the second pipe 400 are only distinguished as a schematic diagram of the installation. There is actually no difference. A built-in pressure-bearing mechanism 500 is provided in the bellows 200 to share the internal pressure of the bellows 200, and an external pressure-bearing detection mechanism 600 is provided on the outside of the bellows 200 to share the medium. While measuring the mass pressure, it detects whether there is a medium leakage. If there is a leakage, it communicates to the controller 640 and takes favorable measures. This embodiment also includes two groups of composite compensation mechanisms 700 connected to the two pipes, and a balancing mechanism 800 arranged between the composite compensation mechanism 700 and the two flanges. The composite compensation mechanism 700 is provided with two groups. According to the first embodiment, this embodiment can form at least three groups of medium circulation channels. Under normal circumstances, the three groups of channels are used for medium circulation at the same time. When the bellows 200 channel leaks, it can be replaced by the other two compensation pipelines 710 for circulation to avoid interruption of the entire circulation pipeline. When one of the compensation pipelines 710 is damaged, the second compensation pipeline 710 can also be used to continue to maintain the circulation of the medium. The multi-way solenoid valve 650 here at least has the function of connecting and disconnecting the bellows 200, the first compensation pipeline 710 and the second compensation pipeline 710. Such a solenoid valve also exists in the prior art and will not be described in detail here.

[0062] The other technical contents of this embodiment are the same as those of the first embodiment, and will not be elaborated here. Of course, two groups of balancing mechanisms 800 should also be provided, and their specific structures are the same as those of the first embodiment.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A maintenance-free combined bellows sleeve compensator, comprising connecting flanges (100) at both ends, a bellows (200) being connected between the two connecting flanges (100), the two connecting flanges (100) being respectively connected to a first pipe (300) for the medium to flow upstream and a second pipe (400) for the medium to flow downstream, characterized in that: The bellows (200) is provided with a built-in pressure-bearing mechanism (500), the bellows (200) is provided with an external pressure-bearing detection mechanism (600) on the outside, and further includes at least one set of composite compensation mechanisms (700) connected to the first pipe (300) and the second pipe (400), and a balancing mechanism (800) provided between the composite compensation mechanism (700) and the two flanges; A multi-way electromagnetic valve (650) is provided on the first pipeline (300); The composite compensation mechanism (700) comprises a compensation pipeline (710) connected to the multi-way electromagnetic valve (650) at one end, and the other end of the compensation pipeline (710) is connected to the second pipeline (400) via a connecting vessel (720); The compensation pipeline (710) includes a first curved pipe portion (711) communicating with the multi-way electromagnetic valve (650) and a second curved pipe portion (712) communicating with the second pipeline (400), and also includes a straight pipe portion (713) communicating with the first curved pipe portion (711) and the second curved pipe portion (712); The balancing mechanism (800) is arranged between the straight pipe portion (713) and the two connecting flanges (100), and comprises an intermediate component (810) and a plurality of telescopic components; The intermediate component (810) is provided with at least three hinged parts (820), which are rotatably connected to one end of a first telescopic component (830), a second telescopic component (840), and a third telescopic component (850), respectively; the other end of the first telescopic component (830) is rotatably connected to a fixing ring (860) on the straight pipe portion (713); and the second telescopic component (840) and the third telescopic component (850) are rotatably connected to two connecting flanges (100), respectively.

2. The maintenance-free combined corrugated sleeve compensator according to claim 1 is characterized in that: The built-in pressure-bearing mechanism (500) comprises a built-in tube (510) arranged inside the bellows (200), the outer wall of the built-in tube (510) being in close contact with the inner wall of the bellows (200), one end of the built-in tube (510) facing the flow direction of the medium being welded to the end of the bellows (200), and the other end being slidably connected to the end of the bellows (200) via a sealing rubber ring (520).

3. The maintenance-free combined corrugated sleeve compensator according to claim 1 is characterized in that: The external pressure detection mechanism (600) comprises sealing ring sleeves (610) sleeved on both ends of the bellows (200), a telescopic tube (620) is provided between the two sealing ring sleeves (610), and a detection component is provided on one of the sealing ring sleeves (610).

4. The maintenance-free combined corrugated sleeve compensator according to claim 3 is characterized in that: The detection assembly comprises a medium leakage detector (630) embedded in the sealing ring sleeve (610); the medium leakage detector (630) is communicatively connected to a controller (640); and the controller (640) controls a multi-way electromagnetic valve (650) connected to the first pipeline (300).

5. The maintenance-free combined corrugated sleeve compensator according to claim 1 is characterized in that: Both the first curved tube portion (711) and the second curved tube portion (712) are elastic.

6. The maintenance-free combined corrugated sleeve compensator according to claim 1, characterized in that: The first telescopic member (830), the second telescopic member (840) and the third telescopic member (850) are tension springs, the intermediate member (810) is a circular plate, and the hinge portion (820) is a through hole provided on the circular plate for hanging the tension springs.

7. The maintenance-free combined corrugated sleeve compensator according to claim 6, characterized in that: The first telescopic member (830), the second telescopic member (840) and the third telescopic member (850) are telescopic rods, the intermediate member (810) is a circular plate, and the hinged portion (820) is a hinged shaft fixed on the circular plate for hingedly connecting the telescopic rods.

8. The maintenance-free combined corrugated sleeve compensator according to claim 4, characterized in that: The composite compensation mechanism (700) is provided with two groups, wherein the controller (640) thereof is communicatively connected to the control center.

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