Assembly type service valve well of water supply project

Abstract

The invention relates to the technical field of underground valve wells, in particular to an assembly type service valve well for water supply engineering, which comprises an assembly type valve well body, a conveying pipeline is arranged in the assembly type valve well body in a penetrating manner, and a rigid-flexible conversion part is further arranged. The rigid-flexible conversion part comprises a pressure relief pipe and is arranged at a pressure relief opening of the conveying pipeline, a sliding upper piston is arranged in the pressure relief pipe, the top of the pressure relief pipe is connected with a hydraulic oil pipe and an in-pipe hydraulic piston, the oil pipe is communicated with a hydraulic telescopic rod, the movable end of the hydraulic telescopic rod is connected with a rigid-flexible conversion ring sleeved on the periphery of the conveying pipeline, and a hoop ring is arranged on the well wall of the valve well body. The upper piston receives pipeline fluid impact energy, the pipeline fluid impact energy is transmitted to the hydraulic telescopic rod through the hydraulic piston, the conversion ring is driven to slide in an annular space between the shroud ring and the conveying pipeline, the left metal ring or the right rubber ring is driven to abut against the inner wall of the shroud ring, and rigid supporting connection between the conveying pipeline and the valve well body is converted into flexible supporting connection. The influence of the water hammer effect on a conveying pipeline is reduced, and the situation that fatigue damage of valve well wall materials is caused by vibration, cracks are caused, and the structural stability is affected is avoided.

Description

Technical Field

[0001] This invention relates to the field of underground valve well technology, and more particularly to a prefabricated maintenance valve well for water supply projects. Background Technology

[0002] A valve well is an underground chamber installed in a water supply system for the installation, inspection, and maintenance of valves and other equipment. The valve well protects valves from external damage, such as vehicle damage or human intervention; it provides convenient operating space for valve maintenance and repair personnel, facilitating regular inspection, cleaning, repair, and replacement of valves and related accessories; the valves within the well allow for the regulation of the water supply system's flow rate, pressure, and direction, enabling precise control of the water supply network; and in emergencies such as pipe ruptures or leaks, it can quickly shut off the corresponding valves, cutting off water supply to the affected area, preventing the accident from escalating, and minimizing losses.

[0003] The patent document with publication number CN117721844A proposes a prefabricated pre-drilled hole grouting valve well structure, which is produced in a standardized factory, eliminating the need for a large amount of manpower and material resources on-site. Factory prefabrication allows for batch production and standardization, ensuring construction quality and progress. For long-distance pipelines, especially in mountainous areas with a large number of venting and drainage wells, the prefabricated spliced ​​pipe wells are transported to designated locations for splicing, followed by concrete pouring. This significantly accelerates the construction progress while ensuring the stability of the prefabricated spliced ​​pipe wells.

[0004] However, during the transport of liquids, if a valve on the pipeline suddenly closes or opens, it can cause a water flow shock wave within the pipeline, leading to water hammer and vibration. Prolonged pipeline vibration can cause fatigue damage to the valve well wall material, resulting in cracks. The connection between the wall and the foundation, as well as brick or concrete joints, may loosen due to repeated vibration, reducing the overall structural integrity and potentially causing collapse. Summary of the Invention

[0005] This invention proposes a prefabricated maintenance valve well for water supply projects to solve problems such as water hammer effect caused by liquid in pipelines, which leads to long-term vibration of the valve well and subsequent collapse.

[0006] The technical solution of the present invention: A prefabricated maintenance valve well for a water supply project, comprising a prefabricated type, wherein a conveying pipe for conveying fluid is installed inside the valve well body, a climbing groove is provided on the inner wall of the valve well body, and a flow rate valve is connected to the middle of the conveying pipe via a flange, and further comprising: The rigid-flexible conversion section includes a pressure relief pipe, which is fixedly installed at the pressure relief port at the top of the delivery pipeline. An upper piston is slidably connected inside the pressure relief pipe, separating the cavity of the delivery pipeline from the cavity of the pressure relief pipe. A hydraulic oil pipe is fixedly installed at the top of the pressure relief pipe. A hydraulic piston that slides inside the hydraulic oil pipe is fixedly connected to the top of the upper piston via a straight rod. The hydraulic oil pipe is connected to a hydraulic telescopic rod via a hydraulic pipe. A rigid-flexible conversion ring is fixedly installed at the movable end of the hydraulic telescopic rod. The rigid-flexible conversion ring is fitted onto the outer wall of the delivery pipeline. A hoop is fixedly installed on the well wall of the valve well body. The rigid-flexible conversion ring is located in the annular space between the hoop and the outer wall of the delivery pipeline and can slide within the annular space. The rigid-flexible conversion ring includes a left metal ring and a right rubber ring. The upper piston is used to receive the impact energy of the fluid transmitted from the pressure relief port in the delivery pipeline and transmit the impact energy to the hydraulic telescopic rod through the hydraulic piston. The movable end of the hydraulic telescopic rod extends out and drives the rigid-flexible conversion ring to slide in the annular space between the hoop and the outer wall of the delivery pipeline, so as to realize the abutment of the left metal ring with the inner wall of the hoop or the abutment of the right rubber ring with the inner wall of the hoop, thereby realizing the conversion of rigid and flexible support between the delivery pipeline and the wall of the valve well body. Optionally, a fixed support ring is fixedly installed on the well wall of the valve well body, and the number of hydraulic telescopic rods is two, with the two hydraulic telescopic rods symmetrically arranged inside the fixed support ring.

[0007] Optionally, a buffer is provided at the bottom of the upper piston. The buffer separates the cavity of the delivery pipe from the cavity of the pressure relief pipe and absorbs the impact energy of the fluid transmitted through the pressure relief port in the delivery pipe.

[0008] Optionally, the buffer includes a lower piston that slides up and down inside the pressure relief pipe. An intermediate spring is elastically connected between the top of the lower piston and the upper piston, and a first telescopic rod is fixedly installed between the top of the lower piston and the upper piston.

[0009] Optionally, liquid flows inside the conveying pipe, and the liquid flows from inside the conveying pipe to the flow rate valve. The pressure relief pipe is fixedly installed at the top of the conveying pipe and near the flow rate valve.

[0010] Optionally, the outer wall of the hoop is provided with an opening and closing part for controlling the opening and closing of the hoop. The opening and closing part includes a bending rod, which is fixedly installed on the movable end of the hydraulic telescopic rod. A compression ring is fixedly installed on the other end of the bending rod. The compression ring can slide along the axial direction of the pipeline on the outer wall of the hoop to open or close the hoop. A groove for limiting the compression ring is fixedly installed on the well wall of the valve well body.

[0011] Optionally, the hoop includes two semi-circular steel rings, the outer wall of which is provided with a trapezoidal groove. The cross-section of the extrusion ring is a trapezoidal structure adapted to the trapezoidal groove, and the extrusion ring can slide within the trapezoidal groove to open the hoop.

[0012] Optionally, the outer wall of the hoop is provided with an anti-deviation opening, the bending rod passes through the anti-deviation opening, and the movable end of the hydraulic telescopic rod is also fixedly installed with a second telescopic rod, the telescopic end of the second telescopic rod being fixedly connected to the rigid-flexible conversion ring.

[0013] Optionally, the inner wall of the pressure relief pipe is provided with a limiting and protective part for positioning the upper piston. The limiting and protective part includes a set of clearance grooves opened in the inner wall of the pressure relief pipe. A positioning block is slidably connected inside the clearance grooves. An air spring is elastically connected between the tail of the positioning block and the pressure relief pipe. The end of the positioning block abuts against the upper piston.

[0014] Optionally, two sets of clearance grooves are provided, each set including two clearance grooves, and the two sets of clearance grooves are linearly distributed along the axial direction of the pressure relief pipe.

[0015] Optionally, the upper piston has a first chamfer on both the upper and lower sides, and the positioning block has a second chamfer at its end. The inclination angle of the first chamfer is the same as that of the second chamfer.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: In this invention, because the flow rate valve restricts the flow rate of the liquid, when the flow rate valve is suddenly closed, the water flow will generate pressure on the valve and pipe wall. Due to the smooth pipe wall, the subsequent water flow quickly reaches its maximum under the action of inertia, generating a water flow shock wave, which in turn causes a water hammer effect. When the water hammer effect occurs, the delivery pipeline will be subjected to the impact force of the liquid. When the impact force on the upper piston is large, a large amount of hydraulic oil in the hydraulic oil pipe is squeezed into the hydraulic telescopic rod, so the extension length of the hydraulic telescopic rod is long, thereby enabling the outer wall of the right rubber ring on the rigid-flexible conversion ring to align with the inner wall of the hoop ring, changing from a rigid connection to a flexible connection, reducing the impact of the water hammer effect on the delivery pipeline, and avoiding fatigue damage to the wall material of the valve well caused by vibration, which could lead to cracks and affect structural stability.

[0017] Furthermore, since the right rubber ring provides support for the conveying pipeline, and the right rubber ring and the hoop ring are interference fit, the friction between the right rubber ring and the hoop ring is large. Through the cooperation of the second telescopic rod and the bending rod, the extrusion ring moves first, and the rigid-flexible conversion ring moves later. That is, the two semi-circular steel rings are released from the rigid-flexible conversion ring. The opening and closing of the hoop ring reduces the contact area between the hoop ring and the right rubber ring, so as to facilitate the movement of the right rubber ring. Then the extrusion ring moves out of the trapezoidal groove. At this time, the extrusion ring tightens the two semi-circular steel rings, so that the hoop ring and the rigid-flexible conversion ring are connected, which can improve the installation stability of the hoop ring and the rigid-flexible conversion ring.

[0018] Furthermore, by replacing the upper piston with the lower piston to withstand the impact, when the impact force of the liquid on the lower piston is small, the lower piston cannot push the upper piston using the first telescopic rod, corresponding to the state of rigid-flexible conversion ring and hoop ring being rigidly connected; when the liquid impact force is large, the upper piston moves and gets stuck in a set of clearance grooves located above, to prevent the upper piston from moving continuously due to liquid impact forces of different strengths, which would cause the rigid-flexible conversion ring to move frequently and wear out, thereby improving its service life. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of the present invention is provided; Figure 2 This is a schematic diagram of the flow rate valve structure of the present invention; Figure 3 This is a schematic diagram of the rigid-flexible transition ring structure of the present invention; Figure 4 This is a cross-sectional schematic diagram of the conveying pipeline structure of the present invention; Figure 5 This is a schematic diagram of the extrusion ring structure in the separated state according to the present invention; Figure 6 This is a schematic front sectional view of the extrusion ring structure of the present invention; Figure 7 This is a schematic diagram of the climbing trough structure of the present invention; Figure 8 This is a cross-sectional schematic diagram of the pressure relief pipe structure of the present invention; Figure 9 for Figure 8 Enlarged schematic diagram of the positioning block structure in part A.

[0020] In the picture: 1. Valve well body; 2. Delivery pipeline; 3. Flow valve; 4. Climbing groove; 5. Rigid-flexible conversion part; 51. Pressure relief pipe; 52. Lower piston; 53. Intermediate spring; 54. First telescopic rod; 55. Upper piston; 56. Hydraulic oil pipe; 57. Hydraulic piston; 58. Fixed support ring; 59. Hydraulic telescopic rod; 510. Rigid-flexible conversion ring; 511. Hoop ring; 6. Opening and closing part; 61. Second telescopic rod; 62. Bending rod; 63. Extrusion ring; 64. Trapezoidal groove; 65. Anti-deviation port; 7. Limiting protection part; 71. First chamfer; 72. Avoidance groove assembly; 73. Positioning block; 74. Second chamfer; 75. Air spring. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0023] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example 1 The embodiments of the present invention propose a prefabricated maintenance valve well for water supply projects, which serves as the most basic implementation of the present invention, such as... Figures 1 to 5 As shown, the device includes a prefabricated valve well body 1. The well body 1 has pre-drilled holes in its wall, through which a conveying pipe 2 passes. A flow rate valve 3 is connected to the middle of the conveying pipe 2 via a flange. The flow rate valve 3 is located inside the valve well body 1. The valve well body 1 serves both to protect the flow rate valve 3 and to facilitate its maintenance. Figure 7 As shown, a climbing groove 4 is provided on the inner wall of the valve well body 1, which provides a climbing groove 4 for maintenance personnel to climb.

[0027] like Figure 2 As shown, liquid flows inside the conveying pipe 2 and flows from the inside of the conveying pipe 2 to the flow rate valve 3. A pressure relief port is provided at the top of the conveying pipe 2 and is located near the flow rate valve. A rigid-flexible conversion part 5 is provided at the pressure relief port. The rigid-flexible conversion part 5 includes a pressure relief pipe 51, which is fixedly installed at the pressure relief port. An upper piston 55 is slidably connected in the internal cavity of the pressure relief pipe 51. The upper piston is used to receive the impact energy of the fluid at the pressure relief port.

[0028] Because the flow rate valve 3 restricts the flow of liquid, the liquid near the flow rate valve 3 exerts a large impact force on the delivery pipeline 2. Therefore, the pressure relief pipe 51 and the lower piston 52 are used to reduce the impact force, thereby improving the connection stability between the delivery pipeline 2 and the flow rate valve 3, and reducing the impact of pipeline vibration on the valve well body. Figure 3 and Figure 4 As shown, a hydraulic oil pipe 56 is fixedly installed on the top of the pressure relief pipe 51. The top of the upper piston 55 is fixedly connected to the hydraulic piston 57, which is slidably set on the hydraulic oil pipe, through a straight rod. The hydraulic oil pipe 56 is connected to a hydraulic telescopic rod 59 through a hydraulic pipe. A rigid-flexible conversion ring 510 is fixedly installed on the movable end of the hydraulic telescopic rod 59. A hoop ring 511 is fixedly installed on the well wall of the valve well body 1. The rigid-flexible conversion ring 510 is fitted on the outer wall of the conveying pipeline 2 and is located in the annular space between the hoop ring 511 and the outer wall of the conveying pipeline 2, and can slide axially in the annular space.

[0029] Therefore, when the liquid in the pipeline exerts a large impact force on the upper piston 55, the upper piston 55 moves upward to push the hydraulic piston 57 upward, thereby squeezing the hydraulic oil in the hydraulic oil pipe 56 into the hydraulic telescopic rod 59. The movable end of the hydraulic telescopic rod 59 extends outward, driving the rigid-flexible conversion ring 510 to slide axially and change the position of the rigid-flexible conversion ring 510.

[0030] like Figure 5As shown, the rigid-flexible conversion ring 510 includes a left metal ring and a right rubber ring. The rigid-flexible conversion ring 510 slides on the outer wall of the conveying pipeline 2. When the upper piston 55 is subjected to a large impact force, the upper piston 55 moves a large distance. At this time, the hydraulic piston 57 moves a large distance, and the amount of hydraulic oil in the hydraulic oil pipe 56 squeezes into the hydraulic telescopic rod 59 is large. Therefore, the hydraulic telescopic rod 59 extends a long length, so that the right rubber ring on the rigid-flexible conversion ring 510 is connected to the hoop ring 511 (the outer wall of the right rubber ring abuts against the inner wall of the hoop ring 511), changing from a rigid connection to a flexible connection. The elasticity of the rubber ring is used to reduce the impact of water hammer effect on the conveying pipeline 2 and the wall of the valve well body 1.

[0031] Understandably, there is a certain difference in the outer diameter between the left metal ring and the right rubber ring, with the outer diameter of the right rubber ring typically being slightly larger than that of the left metal ring. The size of the left metal ring is matched with the inner diameter of the clamping ring 511, and the right rubber ring and clamping ring 511 are interference fit.

[0032] When the impact force on the upper piston 55 is small, the upper piston 55 moves a small distance. At this time, the hydraulic piston 57 moves a small distance, and the amount of hydraulic oil in the hydraulic oil pipe 56 squeezed into the hydraulic telescopic rod 59 is small. Therefore, the extension length of the hydraulic telescopic rod 59 is short, so that the left metal ring on the rigid-flexible conversion ring 510 is connected with the hoop ring 511 and converted into a rigid support, thereby improving the installation stability of the conveying pipeline 2 on the valve well body 1.

[0033] A fixed support ring 58 is fixedly installed in the reserved hole of the valve well body 1. Two hydraulic telescopic rods 59 are provided, and the two hydraulic telescopic rods are symmetrically arranged inside the fixed support ring 58. A portion of the rigid-flexible conversion ring 510 is located outside the hoop ring 511. This ensures that the rigid-flexible conversion ring 510 is subjected to uniform force when it moves.

[0034] In the embodiments described in this invention, since the flow rate valve 3 restricts the flow rate of the liquid, the conveying pipeline 2 will be subjected to the impact force of the liquid. At this time, the upper piston 55 is subjected to the impact of the liquid, which reduces the impact force of the liquid on the connection between the conveying pipeline 2 and the flow rate valve 3. When the impact force on the upper piston 55 is large, the upper piston 55 moves a large distance. At this time, the hydraulic piston 57 moves a large distance, and the amount of hydraulic oil in the hydraulic oil pipe 56 squeezed into the hydraulic telescopic rod 59 is large. Therefore, the extension length of the hydraulic telescopic rod 59 is long, so that the right rubber ring on the rigid-flexible conversion ring 510 is connected with the hoop ring 511, changing from a rigid support connection to a flexible support connection. This reduces the impact of water hammer effect on the conveying pipeline 2 and avoids fatigue damage to the valve well wall material caused by vibration, which can lead to cracks and affect the structural stability.

[0035] Example 2 Based on Example 1, this embodiment, for example Figures 5 to 6As shown, the clamp 511 includes two semi-circular steel rings. Because of these two semi-circular steel rings, the clamp 511 has an opening and closing function. The two semi-circular steel rings are arranged one above the other. Due to the high friction between the right rubber ring and the clamp 511, opening and closing the clamp 511 reduces the contact area between the clamp 511 and the right rubber ring, thereby reducing friction and facilitating the movement of the right rubber ring. A lubrication cylinder can be installed on the inner wall of the rigid-flexible transition ring 510 to reduce the friction between the rigid-flexible transition ring 510 and the conveying pipeline.

[0036] Furthermore, the outer wall of the hoop 511 is provided with an opening and closing part 6 for controlling its opening and closing. The opening and closing part 6 includes a bending rod 62, which is fixedly installed at the movable end of the hydraulic telescopic rod 59. A compression ring 63 is fixedly installed at the other end of the bending rod 62. The compression ring 63 can slide along the axial direction on the outer wall of the hoop 511. A groove for limiting the compression ring 63 is fixedly installed inside the valve well body 1.

[0037] The outer wall of the semi-circular steel ring is provided with a trapezoidal groove 64. The cross section of the extrusion ring 63 adopts a trapezoidal structure to fit the trapezoidal groove 64. The extrusion ring 63 slides in the trapezoidal groove 64. The outer wall of the hoop 511 is provided with an anti-deviation opening 65. The bending rod 62 passes through the anti-deviation opening 65. The movable end of the hydraulic telescopic rod 59 is also fixedly installed with a second telescopic rod 61. The telescopic end of the second telescopic rod 61 is fixedly connected to the rigid-flexible conversion ring 510.

[0038] Because of the presence of the second telescopic rod 61, before the second telescopic rod 61 is fully compressed, the hydraulic telescopic rod 59 cannot push the second telescopic rod 61 to move the rigid-flexible conversion ring 510, that is, it cannot change the position of the rigid-flexible conversion ring 510. However, the extension of the hydraulic telescopic rod 59 causes the bending rod 62 to move, which in turn directly drives the extrusion ring 63 to move. When the extrusion ring 63 slides into the trapezoidal groove 64 of the hoop ring 511, the two semi-circular steel rings separate. After the second telescopic rod 61 is fully compressed, the hydraulic telescopic rod 59 continues to extend and pushes the rigid-flexible conversion ring 510 using the second telescopic rod 61. At the same time, the compression ring 63 also moves. When the compression ring 63 moves out of the trapezoidal groove 64, the compression ring 63 clamps the two semi-circular steel rings, and the right rubber ring is squeezed into the annular space between the clamping ring 511 and the conveying pipe 2. The outer circumference of the right rubber ring abuts against the inner wall of the clamping ring 511, changing from a rigid support connection to a flexible support connection.

[0039] In this embodiment, since the right rubber ring provides support for the conveying pipe 2, and the right rubber ring and the hoop ring 511 are interference fit, the friction between the right rubber ring and the hoop ring 511 is large, making it difficult for them to move. At this time, the second telescopic rod 61 and the bending rod 62 cooperate to make the extrusion ring 63 move first, and the rigid-flexible conversion ring 510 move later. That is, the two semi-circular steel rings are released from the rigid-flexible conversion ring 510. The opening and closing of the hoop ring 511 reduces the contact area between the hoop ring 511 and the right rubber ring, so as to facilitate the movement of the right rubber ring. Then the extrusion ring 63 moves out from the trapezoidal groove 64. At this time, the extrusion ring 63 tightens the two semi-circular steel rings, so that the hoop ring 511 and the rigid-flexible conversion ring 510 are connected, improving the installation stability of the hoop ring 511 and the rigid-flexible conversion ring 510.

[0040] Example 3 Based on Example 1 or Example 2, such as Figures 8 to 9 As shown, a buffer is provided at the bottom of the upper piston 55. The buffer separates the cavity of the conveying pipe 2 from the cavity of the upper pressure relief pipe 5, and the buffer directly absorbs the fluid impact energy at the pressure relief port. The buffer includes a lower piston 52, which can slide up and down inside the pressure relief pipe 51. An intermediate spring 53 is connected between the top of the lower piston 52 and the upper piston 55, and a first telescopic rod 54 is also fixedly installed between the top of the lower piston 52 and the upper piston 55.

[0041] Furthermore, the inner wall of the pressure relief pipe 51 is provided with a limiting and protective part 7 for positioning the upper piston 55. The limiting and protective part 7 includes a clearance groove group 72 opened on the inner wall of the pressure relief pipe 51. A positioning block 73 is slidably arranged inside the clearance groove group 72. An air spring 75 is connected between the tail of the positioning block 73 and the pressure relief pipe 51. The end of the positioning block 73 is engaged with the upper piston 55.

[0042] The upper piston 55 is blocked by the positioning block 73. When the liquid impacts, the liquid cannot directly impact the upper piston 55 because of the presence of the lower piston 52. When the liquid impact force is small, the lower piston 52 and the intermediate spring 53 work together to eliminate small vibration forces.

[0043] Two sets of clearance groove groups 72 are provided, with two clearance grooves in each set. The two sets of clearance groove groups 72 are linearly distributed along the axial direction of the pressure relief pipe 51. The two sets of clearance groove groups 72 correspond to the two docking states of the rigid-flexible conversion ring 510 and the hoop ring 511, respectively.

[0044] The upper piston 55 has a first chamfer 71 on both its upper and lower sides, and the positioning block 73 has a second chamfer 74 at its end. The inclination angle of the first chamfer 71 is the same as that of the second chamfer 74. The inclination angles are the same so that the upper piston 55 can apply force to the positioning block 73.

[0045] When the liquid impact force is large, the lower piston 52 compresses the intermediate spring 53 and causes the first telescopic rod 54 to fully retract. The lower piston 52 uses the first telescopic rod 54 to push the upper piston 55 and break through the restriction of the positioning block 73 on the upper piston 55, thereby causing the upper piston 55 to move and get stuck in a set of clearance grooves 72 located above.

[0046] In this embodiment, the lower piston 52 is subjected to impact instead of the upper piston 55. When the impact force of the liquid on the lower piston 52 is small, the lower piston 52 cannot push the upper piston 55 using the first telescopic rod 54, corresponding to the state of rigid-flexible conversion ring 510 and hoop ring 511 being rigidly connected. When the liquid impact force is large, the lower piston 52 uses the first telescopic rod 54 to push the upper piston 55 and break through the restriction of the positioning block 73 on the upper piston 55, thereby causing the upper piston 55 to move and be engaged in a set of clearance grooves 72 located above, corresponding to the state of flexible connection between the rigid-flexible conversion ring 510 and hoop ring 511. This avoids the upper piston 55 from moving continuously due to liquid impact forces of different strengths, which would cause the rigid-flexible conversion ring 510 to move frequently and wear out, thus improving its service life.

[0047] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A prefabricated maintenance valve well for a water supply project, comprising a prefabricated valve well body (1), wherein a conveying pipe (2) is disposed inside the valve well body (1), characterized in that, Also includes: The rigid-flexible conversion part (5) includes a pressure relief pipe (51), which is fixedly installed at the pressure relief port of the delivery pipeline (2). An upper piston (55) is slidably connected inside the pressure relief pipe (51). A hydraulic oil pipe (56) is fixedly installed on the top of the pressure relief pipe (51). A hydraulic piston (57) that slides inside the hydraulic oil pipe (56) is fixedly connected to the top of the upper piston (55) through a straight rod. A hydraulic telescopic rod (59) is connected to the hydraulic oil pipe (56) through a hydraulic pipe. The movable end of the hydraulic telescopic rod (59) is fixedly connected to a rigid-flexible conversion ring (510) fitted on the outer periphery of the delivery pipeline (2). A hoop ring (511) is fixedly installed on the well wall of the valve well body (1). The rigid-flexible conversion ring (510) includes a left metal ring and a right rubber ring; the upper piston (55) is used to receive the impact energy of the fluid in the conveying pipe (2) and transmit the impact energy to the hydraulic telescopic rod (59) through the hydraulic piston (57). The movable end of the hydraulic telescopic rod (59) extends or retracts to drive the rigid-flexible conversion ring (510) to slide in the annular space between the hoop ring (511) and the outer wall of the conveying pipe (2), so as to realize that the left metal ring abuts against the inner wall of the hoop ring (511) or the right rubber ring abuts against the inner wall of the hoop ring (511).

2. The prefabricated maintenance valve well for a water supply project according to claim 1, characterized in that: The valve well body (1) has a fixed support ring (58) fixedly installed on its well wall, and the hydraulic telescopic rod (59) is symmetrically arranged inside the fixed support ring (58).

3. The prefabricated maintenance valve well for a water supply project according to claim 1, characterized in that: The outer wall of the hoop (511) is provided with an opening and closing part (6) for controlling the opening and closing of the hoop (511). The opening and closing part (6) includes a bending rod (62). The bending rod (62) is fixedly installed at the movable end of the hydraulic telescopic rod (59). The other end of the bending rod (62) is fixedly installed with a compression ring (63). The compression ring (63) slides on the outer wall of the hoop (511) to open or close the hoop (511). A groove for limiting the compression ring (63) is fixedly installed on the well wall of the valve well body (1).

4. The prefabricated maintenance valve well for a water supply project according to claim 3, characterized in that: The hoop (511) includes two semi-circular steel rings. The outer wall of the semi-circular steel rings is provided with a trapezoidal groove (64). The cross section of the extrusion ring (63) is a trapezoidal structure adapted to the trapezoidal groove. The extrusion ring (63) slides in the trapezoidal groove (64).

5. The prefabricated maintenance valve well for a water supply project according to claim 4, characterized in that: The outer wall of the hoop (511) is provided with an anti-deviation opening (65), and the bent rod (62) is inserted into the anti-deviation opening (65).

6. The prefabricated maintenance valve well for a water supply project according to claim 1, characterized in that: The movable end of the hydraulic telescopic rod (59) is fixedly installed with a second telescopic rod (61), and the end of the second telescopic rod (61) is fixedly connected to the rigid-flexible conversion ring (510).

7. The prefabricated maintenance valve well for a water supply project according to claim 1, characterized in that, The bottom of the upper piston (55) is provided with a buffer; the buffer includes a lower piston (52), which slides up and down inside the pressure relief pipe (51), and an intermediate spring (53) is elastically connected between the top of the lower piston (52) and the upper piston (55); a first telescopic rod (54) is also fixedly installed between the top of the lower piston (52) and the upper piston (55).

8. The prefabricated maintenance valve well for a water supply project according to claim 1, characterized in that: The inner wall of the pressure relief pipe (51) is provided with a limiting protection part (7) for positioning the upper piston (55). The limiting protection part (7) includes a clearance groove group (72) opened on the inner wall of the pressure relief pipe (51). A positioning block (73) is slidably connected inside the clearance groove group (72). An air spring (75) is connected between the tail of the positioning block (73) and the pressure relief pipe (51). The end of the positioning block (73) abuts against the upper piston (55).

9. A prefabricated maintenance valve well for a water supply project according to claim 8, characterized in that: The avoidance groove group (72) is provided in two groups, with two avoidance grooves in each group, and the two groups of avoidance groove groups (72) are distributed along the axial direction of the pressure relief pipe (51).

10. A prefabricated maintenance valve well for a water supply project according to claim 8, characterized in that: The upper piston (55) has a first chamfer (71) on both the upper and lower sides, and the positioning block (73) has a second chamfer (74) at the tail. The slope angle of the first chamfer (71) is the same as the slope angle of the second chamfer (74).

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