Drainage device for rainwater and sewage diversion

Abstract

The invention provides a drainage device for rainwater and sewage diversion, and relates to the technical field of drainage, the drainage device comprises an external pipe, and a mounting ring is arranged in the center of the interior of the external pipe; the device further comprises a rotating mechanism, the rotating mechanism comprises a rotating shaft, the rotating shaft is coaxially arranged in the outer pipe, the rotating shaft is rotationally connected with the mounting ring, a plurality of sets of impellers are arranged on the surface of the rotating shaft, and the other ends of the impellers are connected with a first connecting ring and a second connecting ring. The first connecting ring and the second connecting ring are rotationally connected with the inner side wall of an external pipe; the device further comprises a follow-up mechanism, the follow-up mechanism comprises a connecting pipe, the connecting pipe is arranged on the lower end face of the external pipe, a driven shaft is coaxially arranged in the connecting pipe, a rotating ring is arranged on the lower end face of the driven shaft, and the rotating ring is rotationally connected with the outer side wall of the connecting pipe. Initial-stage dirt-containing rainwater and later-stage clean rainwater can be automatically distinguished without manual intervention.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drainage, more particularly, it relates to a drainage device for rain and sewage separation. BACKGROUND

[0002] In the existing urban drainage infrastructure and rainwater management technology system, the problem of ineffective separation of sewage and clean water in the rainwater drainage system is widespread. The traditional combined sewerage system collects rainwater from urban roads, roofs and other hard surfaces together with domestic sewage and industrial wastewater in the same pipe network for transportation, and finally discharges into natural water bodies or is sent to a wastewater treatment plant. This design concept originated from the early stage of urban development when water resources were scarce and environmental awareness was relatively weak. In the early stage of rainfall, rainwater runoff from roads carries a large amount of suspended solids, heavy metals, oil and other pollutants. This part of rainwater indeed contains a high concentration of pollutants and needs to be properly treated. However, as the rainfall continues, the water quality of subsequent rainwater gradually improves and even approaches the quality standard of natural freshwater. Unfortunately, the existing drainage system lacks the ability to identify and separate this water quality change process, and cannot intelligently separate according to water quality characteristics, resulting in a large amount of clean rainwater resources being unnecessarily introduced into the wastewater treatment system or being directly discharged.

[0003] This non-separation of sewage and clean rainwater drainage mode causes serious resource waste and environmental burden. First, a large amount of good quality rainwater resources is incorrectly treated as "waste water" and is not included in the urban water resource recycling system, which is particularly regrettable in the face of increasing water scarcity. Second, a large amount of clean rainwater entering the wastewater treatment system not only significantly increases the treatment load of the wastewater treatment plant, leading to excessive consumption of energy and chemical agents, but also frequently causes the treatment system to operate at overload during heavy rain, causing some mixed sewage to overflow into rivers without being treated, thereby exacerbating water pollution. SUMMARY

[0004] (I) Technical problems solved In view of the problems in the prior art, the present application provides a drainage device for rain and sewage separation to solve the technical problems mentioned in the background.

[0005] (II) Technical solutions In order to achieve the above object, the present application provides the following technical scheme: a drainage device for rain and sewage diversion, comprising an external pipe, a mounting ring is arranged at the center position inside the external pipe; further comprising a rotating mechanism, the rotating mechanism comprises a rotating shaft, the rotating shaft is coaxially arranged inside the external pipe, the rotating shaft is rotatably connected with the mounting ring, a plurality of sets of impellers are arranged on the surface of the rotating shaft, a first connecting ring and a second connecting ring are connected to the other end of the impeller, the first connecting ring and the second connecting ring are rotatably connected with the inner side wall of the external pipe; further comprising a follow-up mechanism, the follow-up mechanism comprises a connecting pipe, the lower end surface of the external pipe is provided with the connecting pipe, a driven shaft is coaxially arranged in the connecting pipe, a rotating ring is arranged on the lower end surface of the driven shaft, and the rotating ring is rotatably connected with the outer side wall of the connecting pipe.

[0006] Preferably, the surface of the mounting ring is provided with a plurality of sets of cross bars and a plurality of sets of inclined bars, the other end of the cross bars and the inclined bars is fixedly connected with the inner side wall of the external pipe, and a reinforcing ring is arranged between the cross bars. In this support structure design, the mounting ring serves as the core bearing platform, providing a stable mounting basis for the entire internal rotating mechanism, and ensuring that the rotating shaft system maintains accurate coaxiality during high-speed rotation.

[0007] Preferably, three sets of fixed rings are arranged between the impellers, and the fixed rings are arranged at equal intervals from top to bottom. The fixed ring system plays a key role in structural stability and performance optimization in the impeller assembly. The equal distribution of the three sets of fixed rings ensures the accurate positioning and uniform load distribution of the impeller on the rotating shaft, preventing the impeller from axial movement or radial swing during high-speed rotation.

[0008] Preferably, a sun gear is arranged on the lower end surface of the rotating shaft, an external gear is coaxially arranged on the outer side of the sun gear, a receiving pipe is coaxially arranged on the lower end of the external gear, and the external gear is attached to the receiving pipe. The core layout of this planetary gear transmission system produces multiple effects. The sun gear serves as the input end of the entire transmission system, efficiently transmitting the rotating motion of the rotating shaft to the planetary gear set. The coaxial design ensures the stability of power transmission and the accuracy of transmission ratio.

[0009] Preferably, three sets of planetary gears are rotatably connected in the receiving pipe, the planetary gears are located between the sun gear and the external gear, and the inner side walls of the sun gear and the external gear are engaged with the planetary gears. The uniform distribution of the planetary gears ensures the balanced distribution of the load in the circumferential direction, eliminates the problem of excessive stress on a single point, and improves the carrying capacity and durability of the transmission system.

[0010] Preferably, the outer gear upper end surface is provided with a plurality of groups of screw sleeves, the screw sleeves are internally provided with hexagonal rods, one end of the hexagonal rods is connected with a counterweight, the other end of the hexagonal rods is connected with a sliding block, the sliding block is in sliding connection with the upper end of the receiving pipe and abuts against the inner side wall of the upper end of the receiving pipe, the anti-rotation design of the hexagonal rods ensures the direct transmission of force between the counterweight and the sliding block, eliminates the torsional stress in the rotation process, and improves the force transmission efficiency and the response accuracy of the system.

[0011] Preferably, the screw sleeve surface is threadedly connected with an adjusting nut, the adjusting nut side wall is provided with a compression spring, the other end of the compression spring is connected with the counterweight side wall, and the adjusting nut and the compression spring cooperate to generate an outward pushing force on the counterweight at the beginning.

[0012] Preferably, the driven shaft upper end surface is fixedly connected with the receiving pipe lower end surface, a plurality of groups of rotating plates are rotatably connected to the surface of the driven shaft, gears are connected to the other ends of the rotating plates, the rotating plates are rotatably connected to the surface of the connecting pipe, and the gears connected to the other ends of the rotating plates provide rotating control for each rotating plate, so that the gears realize accurate positioning of the rotating plate angle, and ensure that adjacent rotating plates can be completely attached to form an effective sealing surface.

[0013] Preferably, the rotating ring upper end surface is provided with an annular rack, the gears are engaged with the annular rack, the simultaneous engagement of the annular rack with a plurality of gears realizes one-to-many transmission control, a single driving source can realize coordinated action of multiple rotating plates, the complexity of the control system is simplified, the reliability and stability of the system are improved, and mechanical support is provided for accurate implementation of rain and sewage separation.

[0014] Preferably, the rotating ring outer side wall is provided with a plurality of groups of clamping rods, the connecting pipe outer surface is provided with a plurality of groups of tension springs, and the tension springs are fixedly connected to the surfaces of the clamping rods. This elastic reset system has the dual effects of automatic recovery and system protection, the plurality of groups of clamping rods provide reliable connection points and force transmission paths for the tension springs, and ensure that the reset force can effectively act on the rotating ring.

[0015] (Three) beneficial effects Compared with the prior art, the drainage device for rain and sewage separation has the following beneficial effects: the device uses the natural physical characteristic of rainwater flow variation as the basis for judgment, and can automatically distinguish the initial sewage-containing rainwater and the later clean rainwater without manual intervention. When the initial rainwater flow is small, the impeller rotating speed is relatively slow, and the centrifugal force generated by the counterweight is not enough to drive the rotating plate to close, so that the polluted rainwater naturally flows into the sewage collection system. When the later rainwater flow increases, the system senses and responds, the rotating plate intelligently closes to realize the separation switching, and the accuracy and timeliness of rain and sewage separation are improved.

[0016] The device has double benefits in water resource protection and environmental improvement. First, through diversion, a large amount of clean rainwater that would have been wasted or improperly treated is effectively collected and reused for various purposes such as urban landscaping irrigation, road cleaning, industrial cooling, etc., which relieves the pressure on urban water use and reduces overexploitation of natural water bodies. Second, by separating the initial contaminated rainwater from the later clean rainwater, the dilution effect of clean rainwater on the sewage treatment system is avoided, improving the efficiency of sewage treatment and reducing chemical agent and energy consumption. At the same time, this diversion method can effectively prevent overflow at sewage treatment plants during the rainy season due to excessive load, avoiding the direct discharge of mixed sewage that has not been fully treated into natural water bodies, thereby protecting the water ecological environment of rivers, lakes, etc.

[0017] The device has cost optimization effects. Traditional combined rainwater and sewage systems need to treat a large amount of clean rainwater that does not need to be treated, resulting in unnecessary increase in sewage treatment costs. Through diversion, the treatment capacity of sewage treatment plants is reduced, and the power consumption, chemical agent usage, equipment wear and tear, and labor costs are all reduced. At the same time, the collected clean rainwater can replace part of the tap water, saving water fees for users. The device uses a pure mechanical structure design, does not require complex electronic control systems, has low operation and maintenance costs, has a long service life, and has a short investment return period.

[0018] The device has a load reduction and disaster prevention effect on urban infrastructure systems. By separating clean rainwater from the sewage system, the operation pressure of urban drainage pipe networks and sewage treatment facilities is reduced, the service life of infrastructure is extended, and the risk of system overload operation is reduced. In extreme rainfall weather, traditional combined systems often experience internal flooding due to insufficient treatment capacity, while the diversion system can better cope with storm surges through rational allocation of water flow, reducing the risk of urban internal flooding. The collection and storage of clean rainwater can also serve as an emergency water source in the event of drought or water supply system failure.

[0019] The device contributes to ecological environment restoration and sustainable development. By reducing the amount of pollutants carried by initial rainwater into natural water bodies, the water quality of rivers and lakes is effectively protected, and the survival environment of aquatic organisms is maintained. The collected clean rainwater is used for urban landscaping, promoting vegetation growth and improving the urban ecological environment, reducing the urban heat island effect, and reducing dependence on groundwater and long-distance water transfer. The application of the device conforms to the concepts of circular economy and sustainable development, laying a good foundation for the long-term development of the city through resource utilization and environmental protection.

[0020] Overall, the rainwater and sewage diversion drainage device has beneficial effects in water resource utilization, environmental protection, economic benefits, and technology popularization through mechanical structure design. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 1 is a schematic diagram of the overall structure of a drainage device for rain and sewage diversion according to the present application; Figure 2 Fig. 2 is a schematic diagram of the cross-sectional structure of an external pipe and a connecting pipe according to the present application; Figure 3 Fig. 3 is a schematic diagram of the cross-sectional structure of an external pipe and an impeller according to the present application; Figure 4 Fig. 4 is a schematic diagram of the cross-sectional structure of an external pipe according to the present application; Figure 5 Fig. 5 is a schematic diagram of the structure of an impeller and a rotating shaft according to the present application; Figure 6 Fig. 6 is a schematic diagram of the structure of a connecting pipe and a rotating plate according to the present application; Figure 7 Fig. 7 is a schematic diagram of the cross-sectional structure of a counterweight and an external gear according to the present application; Figure 6 Fig. 8 is a schematic diagram of the cross-sectional structure of a receiving pipe and a sun gear according to the present application; Figure 8 Fig. 9 is a schematic diagram of the exploded structure of a counterweight and an external gear according to the present application. Figure 9 Fig. 10 is a schematic diagram of the exploded structure of a receiving pipe and a sun gear according to the present application. Figure 10 In the drawings: 11, external pipe; 12, mounting ring; 13, crossbar; 14, diagonal bar; 15, reinforcing ring; 21, rotating shaft; 22, impeller; 23, first connecting ring; 24, second connecting ring; 25, fixing ring; 26, sun gear; 27, external gear; 28, receiving pipe; 29, planetary gear; 31, connecting pipe; 32, driven shaft; 33, rotating ring; 34, rotating plate; 35, gear; 36, ring-shaped rack; 37, clamping rod; 38, tension spring; 210, threaded sleeve; 211, hexagonal rod; 212, counterweight; 213, sliding block; 214, adjusting nut; 215, compression spring.

[0022] DETAILED DESCRIPTION It should be noted that the embodiments and features in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0023] It should be noted that all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs, unless otherwise specified.

[0024]

[0025] ​In the present application, the orientation such as "upper, lower" is generally directed to the direction shown in the drawings, or the vertical, perpendicular or gravity direction, unless otherwise specified; similarly, for the convenience of understanding and description, "left, right" is generally directed to the left and right shown in the drawings; "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0026] Please refer to Figures 1 to 10 A drainage device for rain and sewage diversion, comprising an outer pipe 11, an installation ring 12 is arranged at the center of the inner part of the outer pipe 11, a plurality of groups of cross bars 13 and a plurality of groups of inclined bars 14 are arranged on the surface of the installation ring 12, the other end of the cross bars 13 and the inclined bars 14 is fixedly connected with the inner side wall of the outer pipe 11, and a reinforcing ring 15 is arranged between the cross bars 13; further comprising a rotating mechanism, the rotating mechanism comprises a rotating shaft 21, the rotating shaft 21 is coaxially arranged in the inner part of the outer pipe 11, the rotating shaft 21 is rotatably connected with the installation ring 12, a plurality of groups of impellers 22 are arranged on the surface of the rotating shaft 21, the other end of the impellers 22 is connected with a first connecting ring 23 and a second connecting ring 24, the first connecting ring 23 and the second connecting ring 24 are rotatably connected with the inner side wall of the outer pipe 11, three groups of fixing rings 25 are arranged between the impellers 22, the fixing rings 25 are arranged at equal intervals from top to bottom, a sun gear 26 is arranged on the lower end surface of the rotating shaft 21, an external gear 27 is coaxially arranged on the outer side of the sun gear 26, a receiving pipe 28 is coaxially arranged on the lower end of the external gear 27, the external gear 27 is attached to the receiving pipe 28, three groups of planetary gears 29 are rotatably connected in the receiving pipe 28, the planetary gears 29 are located between the sun gear 26 and the external gear 27, the planetary gears 29 are respectively engaged with the inner side wall of the sun gear 26 and the external gear 27, a plurality of groups of screw sleeves 210 are arranged on the upper end surface of the external gear 27, a hexagonal rod 211 is arranged in the screw sleeve 210, a counterweight 212 is connected to one end of the hexagonal rod 211, and a sliding block 213 is connected to the other end of the hexagonal rod 211, the sliding block 213 is slidably connected with the upper end of the receiving pipe 28 and abuts against the inner side wall of the upper end of the receiving pipe 28, an adjusting nut 214 is threadedly connected with the surface of the screw sleeve 210, a compression spring 215 is arranged on the side wall of the adjusting nut 214, and the other end of the compression spring 215 is connected with the side wall of the counterweight 212.

[0027] When the sky begins to rain, the initial rainwater carries the accumulated soil particles, dust, oil stains, fallen leaves and other impurities on the road, and the water quality is turbid and the pollutant concentration is high, which needs to be guided to the sewage collection device for treatment. At this time, the rainwater collected from a high place flows into the external pipe 11 by gravity, forming a water flow with a certain impact force. The rainwater impacts the multiple sets of impellers 22, causing the rotating shaft 21 to rotate. The rotating shaft 21 drives the bottom sun gear 26 to rotate, and the planetary gears 29 meshed with it rotate accordingly. At this time, the external gear 27 starts to rotate with the planetary gears 29, and the multiple sets of counterweight blocks 212 fixed on the upper end face of the external gear 27 start to rotate. Since the rotating speed is relatively low at this time, the centrifugal force generated by the counterweight blocks 212 has not reached a large enough value. At this time, the lower rotating plate 34 is in an open state, and the rainwater that has been guided and buffered by the impellers 22 continues to flow downward and finally flows into the lower sewage collection device through the gaps between the multiple sets of rotating plates 34 in the open state.

[0028] As the rain continues and gradually increases, due to the scouring of the early rainwater, large particle impurities and soluble pollutants have been carried away by the early rainwater. At this time, the rainwater flowing into the drainage device shows an increasingly clear state, and the water quality approaches the natural freshwater standard, which has the value of reuse. At the same time, the rainwater flow increases significantly in this stage, forming a strong and continuous water flow impact force. A large amount of rainwater impacts the impellers 22, causing the rotating shaft 21 to rotate at a higher speed, which in turn drives the sun gear 26 and the planetary gears 29 meshed with it to move faster. The high-speed movement of the planetary gears 29 further accelerates the rotating speed of the external gear 27. At this time, the multiple sets of counterweight blocks 212 fixed on the upper end face of the external gear 27 rotate at high speed with the external gear 27. The centrifugal force generated by the counterweight blocks 212 increases, generating a large outward expansion force. Each counterweight block 212 is connected to the sliding block 213 through the hexagonal rod 211. The centrifugal force pushes the sliding block 213 to the inner side wall of the receiving pipe 28. The friction force between the sliding block 213 and the inner wall of the receiving pipe 28 increases with the increase of the centrifugal force. When the friction force exceeds the static friction threshold of the receiving pipe 28, the sliding block 213 starts to drag the receiving pipe 28 to rotate. At this time, the driven shaft 32 connected below the receiving pipe 28 rotates, and the rotating ring 33 connected below the driven shaft 32 rotates. The annular rack 36 arranged above the rotating ring 33 meshes with the gear 35 at the end of the rotating plate 34, and the annular rack 36 drives the gear 35 to rotate, and then the multiple sets of rotating plates 34 start to rotate synchronously. After the adjacent two sets of rotating plates 34 are tightly attached, a sealed state is achieved, and rainwater cannot flow into the lower sewage collection device, forcing the rainwater to accumulate in the connecting pipe 31. When the water level in the connecting pipe 21 reaches a certain height, the accumulated clean rainwater flows into the clean water collection device through the opening specially arranged at the lower part of the external pipe 11, realizing the effective diversion of clean rainwater. At this time, the multiple sets of tension springs 38 arranged on the outer side of the connecting pipe 31 are in a stretched state.

[0029] When the rainfall gradually weakens or completely stops, the rainwater flow into the device is significantly reduced, the water flow impact force on the impeller 22 is reduced, the rotation speed of the whole transmission system begins to decrease. The centrifugal force generated by the counterweight 212 is correspondingly reduced, the friction force of the sliding block 213 on the inner wall of the receiving pipe 28 is not enough to maintain the rotation of the receiving pipe 28, the receiving pipe 28 gradually stops rotating, at this time the tension spring 38 rebounds, drives the rotating ring 33 to rotate through the clamping rod 37, and the rotating plate 34 is opened again to return to the initial state, preparing for the next rainfall cycle.

[0030] The follow-up mechanism includes a connecting pipe 31, the lower end surface of the outer pipe 11 is provided with the connecting pipe 31, the connecting pipe 31 is coaxially provided with a driven shaft 32 in the inner, the lower end surface of the driven shaft 32 is provided with a rotating ring 33, the rotating ring 33 is rotatably connected with the outer side wall of the connecting pipe 31, the upper end surface of the driven shaft 32 is fixedly connected with the lower end surface of the receiving pipe 28, the surface of the driven shaft 32 is rotatably connected with a plurality of groups of rotating plates 34, the other end of the rotating plate 34 is connected with a gear 35, the rotating plate 34 is rotatably connected with the surface of the connecting pipe 31, the upper end surface of the rotating ring 33 is provided with an annular gear rack 36, the gear 35 is engaged with the annular gear rack 36, the outer side wall of the rotating ring 33 is provided with a plurality of groups of clamping rods 37, the outer surface of the connecting pipe 31 is provided with a plurality of groups of tension springs 38, and the tension spring 38 is fixedly connected with the surface of the clamping rod 37.

[0031] In all the above-mentioned schemes, the connection between the two components can be selected according to the actual situation, such as welding, bolt and nut cooperation connection, bolt or screw connection or other known connection mode, which will not be repeated here. In the above, whenever it is mentioned that it is fixedly connected, it is preferred to consider welding. Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A drainage device for separating rainwater and sewage, comprising an external pipe (11), wherein an mounting ring (12) is provided at the center of the interior of the external pipe (11); characterized in that: It also includes a rotating mechanism, which includes a rotating shaft (21). The rotating shaft (21) is coaxially arranged inside the outer tube (11). The rotating shaft (21) is rotatably connected to the mounting ring (12). The surface of the rotating shaft (21) is provided with several sets of impellers (22). The other end of the impeller (22) is connected to a first connecting ring (23) and a second connecting ring (24). The first connecting ring (23) and the second connecting ring (24) are rotatably connected to the inner side wall of the outer tube (11). It also includes a follower mechanism, which includes a connecting tube (31). The lower end face of the outer tube (11) is provided with a connecting tube (31). The connecting tube (31) is coaxially arranged inside the connecting tube (31). The lower end face of the follower shaft (32) is provided with a rotating ring (33). The rotating ring (33) is rotatably connected to the outer side wall of the connecting tube (31).

2. A drainage device for separating rainwater and sewage according to claim 1, characterized in that: The mounting ring (12) has several sets of horizontal bars (13) and several sets of diagonal bars (14) on its surface. The other end of the horizontal bars (13) and the diagonal bars (14) is fixedly connected to the inner wall of the outer tube (11). A reinforcing ring (15) is provided between the horizontal bars (13).

3. A drainage device for separating rainwater and sewage according to claim 1, characterized in that: Three sets of fixing rings (25) are provided between the impellers (22), and the fixing rings (25) are arranged at equal intervals from top to bottom.

4. A drainage device for separating rainwater and sewage according to claim 3, characterized in that: The lower end face of the rotating shaft (21) is provided with a sun gear (26), and an external gear (27) is coaxially provided on the outer side of the sun gear (26). The lower end of the external gear (27) is coaxially provided with a bearing tube (28), and the external gear (27) is attached to the bearing tube (28).

5. A drainage device for separating rainwater and sewage according to claim 4, characterized in that: Three sets of planetary gears (29) are rotatably connected inside the bearing tube (28). The planetary gears (29) are located between the sun gear (26) and the external gear (27). The planetary gears (29) mesh with the inner walls of the sun gear (26) and the external gear (27), respectively.

6. A drainage device for separating rainwater and sewage according to claim 5, characterized in that: The upper end face of the external gear (27) is provided with several sets of threaded sleeves (210). The threaded sleeves (210) are provided with hexagonal rods (211). One end of the hexagonal rods (211) is connected to a counterweight (212), and the other end is connected to a slider (213). The slider (213) is slidably connected to the upper end of the bearing tube (28) and abuts against the inner side wall of the upper end of the bearing tube (28).

7. A drainage device for separating rainwater and sewage according to claim 6, characterized in that: The screw sleeve (210) is threaded with an adjusting nut (214), and the side wall of the adjusting nut (214) is provided with a compression spring (215). The other end of the compression spring (215) is connected to the side wall of the counterweight (212).

8. A drainage device for separating rainwater and sewage according to claim 1, characterized in that: The upper end face of the driven shaft (32) is fixedly connected to the lower end face of the receiving pipe (28). Several sets of rotating plates (34) are rotatably connected to the surface of the driven shaft (32). A gear (35) is connected to the other end of the rotating plate (34). The rotating plate (34) is rotatably connected to the surface of the connecting pipe (31).

9. A drainage device for separating rainwater and sewage according to claim 8, characterized in that: The upper end face of the rotating ring (33) is provided with an annular rack (36), and the gear (35) meshes with the annular rack (36).

10. A drainage device for separating rainwater and sewage according to claim 9, characterized in that: The outer wall of the rotating ring (33) is provided with several sets of clamps (37), and the outer surface of the connecting pipe (31) is provided with several sets of tension springs (38). The tension springs (38) are fixedly connected to the surface of the clamps (37).

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