Telescopic underground drainage pipeline compensator

Abstract

The invention discloses a telescopic underground drainage pipeline compensator, and belongs to the field of compensators. A telescopic underground drainage pipeline compensator comprises a first flange and a second flange, one end of the first flange and one end of the second flange are both fixedly connected with conveying pipes, a corrugated pipe is fixedly installed between the two conveying pipes, a flow guide pipe and a movable limiting ring are arranged on the inner wall of the corrugated pipe, and the flow guide pipe and the movable limiting ring are arranged in one conveying pipe. The limiting ring is fixedly connected with one end of the flow guide pipe through a connecting ring; by arranging the protruding ring, the limiting ring and the elastic part, the gap between the flow guide pipe and the corrugated pipe can be limited, the good sealing effect is achieved under the state that pipeline stretching and retracting are not affected, water and impurities conveyed in the pipeline are prevented from permeating into the gap, the stability of pipeline stretching and retracting is improved, and the service life of the pipeline is prolonged. And residual impurities are prevented from affecting the quality of conveyed water, maintenance is convenient, the function of self-cleaning water pumping and seepage is achieved, and the maintenance cost of the pipeline is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of compensators, and in particular to a telescopic underground drainage pipeline compensator. Background Art

[0002] In modern industry, the pipeline system is an indispensable component used to transport liquids, gases or solid particles. However, due to factors such as temperature changes, mechanical vibrations, and foundation settlement, the pipeline system often expands and contracts due to heat, resulting in stress concentration and pipeline deformation, and even rupture and leakage. Therefore, a retractable compensator is installed between the pipelines to eliminate the stress caused by the thermal expansion and contraction of the pipeline, thereby improving the safety and stability of the pipeline system. In the prior art, most telescopic compensators include a flange connection part, a bellows telescopic part and a guide pipe. When the pipeline is expanded and contracted, the stress is eliminated by the expansion and contraction of the bellows. However, the guide pipe is sleeved in the bellows body. Penetrating liquid and impurities are easy to enter the gap between the guide pipe and the bellows. Excessive accumulation for a long time is likely to affect the expansion and contraction effect of the pipeline. The accumulated impurities are easy to affect the transported medium, wear and penetrate the corrugated part, and increase the maintenance cost. Therefore, we propose a telescopic underground drainage pipe compensator to solve the above-mentioned problems. Summary of the invention

[0003] The purpose of the present invention is to solve the problem in the prior art that liquid and impurities are easily penetrated into the gap between the guide pipe and the corrugated pipe, and excessive accumulation for a long time is likely to affect the expansion and contraction effect of the pipe, and the accumulated impurities are likely to affect the transported medium, causing wear and penetration of the corrugated part, increasing maintenance costs, and a retractable underground drainage pipe compensator is proposed.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A telescopic underground drainage pipe compensator comprises a first flange and a second flange, one end of each of the first flange and the second flange is fixedly connected to a delivery pipe, a bellows is fixedly installed between the two delivery pipes, a guide pipe is arranged on the inner wall of the bellows, a movable limiting ring is arranged in one of the delivery pipes, the limiting ring is fixedly connected to one end of the guide pipe through a connecting ring; raised rings distributed at equal intervals are arranged on the inner wall of one of the delivery pipes; an elastic part is fixed on the top surface of the limiting ring, and cooperates with the limiting ring to form a cavity structure, when the elastic part and the raised ring are in sliding contact, they are elastically deformed to block the gap between the bellows and the guide pipe, when the elastic part is deformed, the water stains remaining in the blocked area are extracted and returned.

[0005] Preferably, a groove is provided on the bottom surface of the elastic part, a rubber ring is fixed on the elastic part at the mouth of the groove, an air supply channel is provided inside the elastic part, a cavity is provided inside the limiting ring, and the air supply channel is connected with the cavity and the rubber ring.

[0006] Preferably, the bottom surface of the elastic part is fixedly connected to a fixed block, the top surface of the fixed block is provided with an arc groove, the arc groove does not contact the air outlet of the air transmission channel, the bottom of the fixed block is fixedly connected to a moving rod, the bottom of the moving rod is fixed with a piston, the piston is slidably connected to the inner wall of the second connecting rod, and the second connecting rod is installed on the inner wall of the limit ring.

[0007] Preferably, a return spring is fixedly connected between the piston and the second connecting rod, a first liquid outlet pipe is provided on one end surface of the second connecting rod, one end of the first liquid outlet pipe passes through the limiting ring and extends into one of the delivery pipes, and a one-way valve is provided at the connection between the piston and the second connecting rod.

[0008] Preferably, an infusion hose is fixedly connected to the top of the second connecting rod, a one-way valve is provided at the connection between the infusion hose and the second connecting rod, one end of the infusion hose passes through the fixed block and the elastic part and extends into the groove, a connecting tube is connected to the surface of the infusion hose, one end of the connecting tube is fixedly connected to one end of the second connecting rod, and a storage cavity is provided inside the second connecting rod.

[0009] Preferably, a one-way valve is provided at the connection between the infusion hose and the connecting tube, a second liquid outlet pipe is fixed to the other end of the second connecting rod, one end of the second liquid outlet pipe passes through the limiting ring and extends into one of the delivery pipes, and a one-way valve is provided at the connection between the second liquid outlet pipe and the second connecting rod.

[0010] Preferably, a support assembly is provided on the inner wall of the limiting ring, and the support assembly includes a support ring fixed on the inner wall of the limiting ring, the support ring is made of elastic rubber material, a fixing ring is provided on the inner ring of the support ring, and an elastic member is provided between the fixing ring and the support ring.

[0011] Preferably, the elastic member includes a sliding rod fixed to the inner wall of the support ring, one end of the sliding rod is fixedly connected to a movable block, the movable block is slidably connected to the inner wall of the first connecting tube, one end of the first connecting tube is fixedly connected to the fixed ring, and the movable block is fixedly connected to the inner wall of the first connecting tube with an extrusion spring.

[0012] Preferably, the first connecting tube, the sliding rod and the fixing ring are all made of high-density polypropylene material.

[0013] Preferably, ear plates are fixed on the surfaces of the first flange and the second flange, an adjusting rod is arranged inside the ear plate, and an adjusting nut is arranged at one end of the adjusting rod.

[0014] Compared with the prior art, the present invention provides a retractable underground drainage pipe compensator, which has the following beneficial effects: 1. This kind of retractable underground drainage pipe compensator, through the mutual cooperation of the raised ring and the limit ring, sets a limit structure on the inner wall of one of the conveying pipes, while not affecting the expansion and contraction state of the pipeline, isolates and limits the gap between the guide pipe and the corrugated pipe to prevent impurities from running into the gap.

[0015] 2. This retractable underground drainage pipe compensator, through the elastic part set, is deformed as it comes into sliding contact with the limit ring. In the deformed state, the force generated by the deformation is used to continuously extract the water seeping from the groove set on the elastic part, and then return it to the conveying pipe, avoiding the occurrence of infiltration in the gap, so that the structure has a self-cleaning function.

[0016] 3. This kind of retractable underground drainage pipe compensator can further support and limit the support component through the setting of the support component, improve the tightness between the outer wall of the limit ring and the inner wall of one of the conveying pipes, improve the sealing between the limit ring and the inner wall of one of the conveying pipes, and the structural design of the support component has a good attraction and noise reduction effect, reducing the occurrence of noise during the water flow transportation process.

[0017] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present invention can limit the gap between the guide pipe and the corrugated pipe by arranging a raised ring, a limiting ring and an elastic part. It has a good sealing effect without affecting the expansion and contraction of the pipeline, prevents water and impurities transported in the pipeline from penetrating into the gap, improves the stability of the expansion and contraction of the pipeline, and avoids residual impurities from affecting the quality of the transported water. It is easy to maintain and has the function of self-cleaning and pumping out seepage water, effectively reducing the maintenance cost of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a retractable underground drainage pipe compensator proposed by the present invention; Figure 2 A schematic diagram of the top view of a retractable underground drainage pipe compensator proposed by the present invention; Figure 3 The present invention proposes Figure 2 Schematic diagram of the AA section structure; Figure 4 The present invention proposes Figure 3 A schematic diagram of the enlarged structure of the middle A area; Figure 5 The present invention proposes Figure 2 Schematic diagram of the structure of the middle BB section; Figure 6 This is a schematic diagram of the cross-sectional three-dimensional structure of the corrugated pipe and the delivery pipe proposed by the present invention; Figure 7 It is a schematic diagram of a partial three-dimensional cross-sectional structure of the guide tube and the limiting ring proposed by the present invention; Figure 8 This is a schematic diagram of a partial cross-sectional three-dimensional structure of the support assembly proposed by the present invention.

[0019] In the figure: 1. first flange; 10. second flange; 11. delivery pipe; 12. bellows; 2. flow guide pipe; 3. limit ring; 31. connecting ring; 32. raised ring; 4. support assembly; 41. fixed ring; 42. first connecting cylinder; 43. movable block; 44. extrusion spring; 45. slide rod; 46. support ring; 5. elastic part; 51. cavity; 52. groove; 53. rubber ring; 54. gas transmission channel; 61. fixed block; 62. moving rod; 63. piston; 64. second connecting rod; 65. reset spring; 66. first liquid outlet pipe; 67. storage chamber; 68. infusion hose; 69. second liquid outlet pipe; 691. connecting pipe; 71. ear plate; 72. adjusting rod; 73. adjusting nut. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, the term "multiple" refers to two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. The terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0022] In the description of this specification, the description of the terms "one embodiment", "some implementations", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0023] Reference Figure 1-Figure 8 A telescopic underground drainage pipe compensator comprises a first flange 1 and a second flange 10, one end of each of the first flange 1 and the second flange 10 is fixedly connected with a delivery pipe 11, a bellows 12 is fixedly installed between the two delivery pipes 11, a guide pipe 2 is arranged on the inner wall of the bellows 12, a movable limiting ring 3 is arranged in one of the delivery pipes 11, the limiting ring 3 is fixedly connected to one end of the guide pipe 2 through a connecting ring 31; raised rings 32 distributed at equal intervals are arranged on the inner wall of one of the delivery pipes 11; an elastic part 5 is fixed on the top surface of the limiting ring 3, and cooperates with the limiting ring 3 to form a cavity structure, when the elastic part 5 is in sliding contact with the raised ring 32, it is elastically deformed to block the gap between the bellows 12 and the guide pipe 2, and when the elastic part 5 is deformed, the water stains remaining in the blocked area are extracted and returned.

[0024] The underground drainage pipes installed in the prior art are generally provided with a retractable compensator at the pipe connection part to eliminate the stress caused by thermal expansion and contraction of the pipe, thereby improving the safety and stability of the pipe system. The retractable compensator generally has a flange connection part, a corrugated retractable part and a guide pipe 2. However, in actual use, when the pipe is retracted and contracted, the stress is eliminated by the expansion and contraction of the corrugated part, but the guide pipe 2 is sleeved in the bellows 12 body, and it is easy for penetrating liquid and impurities and foreign objects to enter the gap between the guide pipe 2 and the bellows 12. Excessive accumulation for a long time is likely to affect the expansion and contraction effect of the pipe, and the accumulated impurities are likely to affect the transported medium, wear and penetrate the corrugated part, and increase the maintenance cost. Therefore, in this scheme, one end of the guide pipe 2 is welded to the inner wall of the conveying pipe 11 fixedly connected to the first flange 1, and the other end of the guide pipe 2 is located at one of the inner walls of the conveying pipe 11 and is slidably connected. A limiting ring 3 is provided at the other end of the guide pipe 2, and the limiting ring 3 is connected to the guide pipe The tubes 2 are fixedly connected by a connecting ring 31, and raised circles 32 are arranged on the inner wall of one of the conveying tubes 11 at equal intervals. When the pipeline is in a telescopic state, the limiting ring 3 cooperates with the raised circle 32. When the expansion and contraction of the pipeline is not affected, the gap between the guide tube 2 and the corrugated tube 12 can be limited and blocked to avoid leakage during the process of conveying liquid in the pipeline, and some impurities in the liquid run into the gap, which effectively improves the sealing effect of the gap. During the process of sealing and limiting, due to long-term use, the sealing contact part will inevitably deform, which reduces the sealing effect. The setting of the raised circle 32 allows the seeped water stains to form a volume cavity between the elastic part 5 and the two adjacent raised circles 32, which has a certain flow limiting effect on the seeped water. As the elastic part 5 moves and contacts with the sliding raised circle 32 to deform, the water in the volume cavity can be continuously extracted and then transported to the pipeline, which has an automatic cleaning effect, eliminating the trouble of manual maintenance and reducing maintenance costs.

[0025] It should be noted that the elastic portion 5 is made of wear-resistant elastic rubber material.

[0026] In a preferred embodiment, referring to Figure 4 A groove 52 is provided on the bottom surface of the elastic part 5, a rubber ring 53 is fixed on the elastic part 5 at the mouth of the groove 52, an air delivery channel 54 is provided inside the elastic part 5, a cavity 51 is provided inside the limiting ring 3, and the air delivery channel 54 is connected with the cavity 51 and the rubber ring 53.

[0027] The elastic part 5 may be deformed when in contact with the raised ring 32. When the elastic part 5 is deformed, the air inside the cavity 51 is squeezed. The squeezed air is transported to the rubber ring 53 through the air delivery channel 54, causing the rubber ring 53 to expand, thereby alleviating the deformation of the rubber ring 53 caused by long-term frictional contact, improving the sealing effect of the rubber ring 53, and preventing liquid leakage of the limit ring 3 when the overall moving state is in place. On the other hand, due to the provision of the groove 52, the leaked liquid is diverted and stored, which is convenient for subsequent rapid extraction of the stored liquid.

[0028] In a preferred embodiment, referring to Figure 4 A return spring 65 is fixedly connected between the piston 63 and the second connecting rod 64. A first liquid outlet pipe 66 is provided on one end surface of the second connecting rod 64. One end of the first liquid outlet pipe 66 penetrates the limiting ring 3 and extends into one of the delivery pipes 11. A one-way valve is provided at the connection between the piston 63 and the second connecting rod 64. A liquid infusion hose 68 is fixedly connected to the top of the second connecting rod 64. A one-way valve is provided at the connection between the liquid infusion hose 68 and the second connecting rod 64. One end of the liquid infusion hose 68 penetrates the fixed block 61 and the elastic part 5 and extends Extending into the groove 52, the surface of the infusion hose 68 is connected to a connecting tube 691, one end of the connecting tube 691 is fixedly connected to one end of the second connecting rod 64, a storage chamber 67 is provided inside the second connecting rod 64, a one-way valve is provided at the connection between the infusion hose 68 and the connecting tube 691, a second liquid outlet pipe 69 is fixed to the other end of the second connecting rod 64, one end of the second liquid outlet pipe 69 passes through the limiting ring 3 and extends into one of the delivery pipes 11, and a one-way valve is provided at the connection between the second liquid outlet pipe 69 and the second connecting rod 64.

[0029] When the elastic portion 5 contacts and squeezes the raised ring 32 to deform, the fixed block 61 is driven to move synchronously, and then the piston 63 at the end of the moving rod 62 slides inside the second connecting rod 64. At this time, negative pressure is generated in the storage chamber 67, and the liquid stored in the groove 52 due to leakage is extracted through the infusion hose 68 to avoid entering the gap between the guide tube 2 and the bellows 12. With the elastic rebound of the reset spring 65, when the extrusion piston 63 moves upward, the extracted liquid is discharged through the second liquid outlet pipe 69 and transported to the pipeline to avoid liquid residue. When the piston 63 moves upward, the one-way valve arranged between the infusion hose 68 and the second connecting rod 64 is closed. At this time, negative pressure is generated in the rodless cavity inside the second connecting rod 64, and the liquid is pumped out through the connecting pipe 691 It is connected with the infusion hose 68 to extract the liquid in the groove 52 again, so as to achieve the effect of continuous extraction of liquid. When the piston 63 moves down next time, the liquid in the rodless chamber is transported to the pipeline through the first liquid outlet pipe 66. Through this structure, no manual maintenance operation is required, which effectively avoids the sealing parts of the prior art compensator from aging due to long-term use and poor sealing, effectively improves the sealing effect, and extracts water stains seeping from the inner wall of the pipeline in the telescopic state, keeps the gap between the guide tube 2 and the bellows 12 dry, and reduces the erosion caused by the residual gap in the transported liquid. This sealing structure can avoid impurities from remaining in the gap, maintain the stability of the pipeline expansion and contraction, and reduce the occurrence of faults.

[0030] In a preferred embodiment, referring to Figure 7 and Figure 8 A support assembly 4 is provided on the inner wall of the limit ring 3, and the support assembly 4 includes a support ring 46 fixed on the inner wall of the limit ring 3. The support ring 46 is made of elastic rubber material, and a fixing ring 41 is provided on the inner ring of the support ring 46. An elastic member is provided between the fixing ring 41 and the support ring 46, and the elastic member includes a slide rod 45 fixed on the inner wall of the support ring 46, and one end of the slide rod 45 is fixedly connected to a movable block 43, and the movable block 43 is slidably connected to the inner wall of the first connecting tube 42, and one end of the first connecting tube 42 is fixedly connected to the fixing ring 41, and the movable block 43 is fixedly connected to the inner wall of the first connecting tube 42 with an extrusion spring 44, and the first connecting tube 42, the slide rod 45 and the fixing ring 41 are all made of high-density polypropylene material.

[0031] During installation, the elastic rebound of the extrusion spring 44 causes multiple slide rods 45 to squeeze the support ring 46, thereby playing a role of uniformly supporting the limit ring 3, so that the limit ring 3 is in a close fit with the inner wall of one of the delivery pipes 11, thereby improving the sealing performance of the limit ring 3. At the same time, through this structure, the liquid transported by the pipeline can be diverted, the turbulent state in the liquid transportation process can be alleviated, the transported liquid can be more stable, the frequency of the pipeline telescopic movement can be alleviated, and the service life of the compensator can be extended. The first connecting tube 42, the slide rod 45 and the fixed ring 41 are made of high-density polypropylene material, which has a good attraction and noise reduction effect, and can reduce the noise generated by the rapidly transported liquid.

[0032] In a preferred embodiment, referring to Figure 3 The surfaces of the first flange 1 and the second flange 10 are both fixed with ear plates 71 , an adjusting rod 72 is arranged inside the ear plate 71 , and an adjusting nut 73 is arranged at one end of the adjusting rod 72 .

[0033] During the installation of the compensator and the pipeline, the compensator can be constrained by the adjusting rod 72 to facilitate the mobile installation operation. An adjusting thread is provided at one end of the adjusting rod 72. The adjusting nut 73 is screwed to limit the length of the adjusting rod 72, thereby controlling the extension and retraction range of the compensator and adjusting it according to the usage.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A telescopic underground drainage pipe compensator, comprising a first flange (1) and a second flange (10), one end of each of the first flange (1) and the second flange (10) being fixedly connected to a delivery pipe (11), a bellows (12) being fixedly installed between the two delivery pipes (11), and a flow guide pipe (2) being arranged on the inner wall of the bellows (12), characterized in that: A movable limiting ring (3) is arranged in one of the conveying pipes (11), wherein the limiting ring (3) is fixedly connected to one end of the flow guide pipe (2) via a connecting ring (31); Raised circles (32) are evenly spaced and arranged on the inner wall of one of the conveying pipes (11); The elastic part (5) is fixed on the top surface of the limiting ring (3) and cooperates with the limiting ring (3) to form a cavity structure. When the elastic part (5) and the raised ring (32) are in sliding contact, the elastic part (5) elastically deforms to seal the gap between the bellows (12) and the guide tube (2). When the elastic part (5) is deformed, the water stains remaining in the sealed area are extracted and returned.

2. The retractable underground drainage pipe compensator according to claim 1, characterized in that: A groove (52) is provided on the bottom surface of the elastic part (5); a rubber ring (53) is fixed on the elastic part (5) at the mouth of the groove (52); an air delivery channel (54) is provided inside the elastic part (5); a cavity (51) is provided inside the limiting ring (3); and the air delivery channel (54) is in communication with the cavity (51) and the rubber ring (53).

3. The retractable underground drainage pipe compensator according to claim 2, characterized in that: A fixing block (61) is fixedly connected to the bottom surface of the elastic portion (5); a circular arc groove is formed on the top surface of the fixing block (61); the circular arc groove does not contact the gas outlet of the gas transmission channel (54); a moving rod (62) is fixedly connected to the bottom of the fixing block (61); a piston (63) is fixed to the bottom of the moving rod (62); the piston (63) is slidably connected to the inner wall of a second connecting rod (64); and the second connecting rod (64) is mounted on the inner wall of the limiting ring (3).

4. The retractable underground drainage pipe compensator according to claim 3 is characterized in that: A return spring (65) is fixedly connected between the piston (63) and the second connecting rod (64); a first liquid outlet pipe (66) is provided on one end surface of the second connecting rod (64); one end of the first liquid outlet pipe (66) passes through the limiting ring (3) and extends into one of the delivery pipes (11); and a one-way valve is provided at the connection between the piston (63) and the second connecting rod (64).

5. The retractable underground drainage pipe compensator according to claim 4, characterized in that: The top of the second connecting rod (64) is fixedly connected to an infusion hose (68), a one-way valve is provided at the connection between the infusion hose (68) and the second connecting rod (64), one end of the infusion hose (68) passes through the fixed block (61) and the elastic portion (5) and extends into the groove (52), a connecting tube (691) is connected to the surface of the infusion hose (68), one end of the connecting tube (691) is fixedly connected to one end of the second connecting rod (64), and a storage chamber (67) is provided inside the second connecting rod (64).

6. The retractable underground drainage pipe compensator according to claim 5, characterized in that: A one-way valve is provided at the connection between the infusion hose (68) and the connecting tube (691); a second liquid outlet pipe (69) is fixed to the other end of the second connecting rod (64); one end of the second liquid outlet pipe (69) passes through the limiting ring (3) and extends into one of the delivery pipes (11); and a one-way valve is provided at the connection between the second liquid outlet pipe (69) and the second connecting rod (64).

7. The retractable underground drainage pipe compensator according to claim 1, characterized in that: The inner wall of the limiting ring (3) is provided with a support assembly (4), the support assembly (4) comprising a support ring (46) fixed to the inner wall of the limiting ring (3), the support ring (46) being made of elastic rubber material, the inner ring of the support ring (46) being provided with a fixing ring (41), and an elastic member being provided between the fixing ring (41) and the support ring (46).

8. The retractable underground drainage pipe compensator according to claim 7, characterized in that: The elastic member comprises a sliding rod (45) fixed to the inner wall of the support ring (46); one end of the sliding rod (45) is fixedly connected to a movable block (43); the movable block (43) is slidably connected to the inner wall of the first connecting tube (42); one end of the first connecting tube (42) is fixedly connected to the fixing ring (41); and a compression spring (44) is fixedly connected between the movable block (43) and the inner wall of the first connecting tube (42).

9. The retractable underground drainage pipe compensator according to claim 8, characterized in that: The first connecting tube (42), the sliding rod (45) and the fixing ring (41) are all made of high-density polypropylene material.

10. The retractable underground drainage pipe compensator according to claim 1, characterized in that: Ear plates (71) are fixed to the surfaces of the first flange (1) and the second flange (10), an adjusting rod (72) is arranged inside the ear plate (71), and an adjusting nut (73) is arranged at one end of the adjusting rod (72).

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