A multi-layer composite high-performance anti-corrosion and thermal insulation pipeline

Abstract

The present invention discloses a multi-layer composite high-performance anti-corrosion and thermal insulation pipe, which relates to the technical field of thermal insulation pipes, including a flow pipe and a valve for opening or closing the flow pipe, wherein the flow pipe is provided with a circulation channel and an anti-hammer mechanism, wherein the circulation channel is upstream of the valve and both ends are connected to the flow pipe; the anti-hammer mechanism has a first state of blocking both ends of the circulation channel and a second state of opening both ends of the circulation channel, and the materials of the flow pipe and the circulation channel are both materials with a thermal conductivity of less than 0.3W / mk. The present invention provides a multi-layer composite high-performance anti-corrosion and thermal insulation pipe, wherein when the flow pipe is in use, the anti-hammer mechanism is in the first state to block the circulation channel so that the fluid passes through the flow pipe normally, and when the valve on the flow pipe is closed, the anti-hammer mechanism switches to the second state; through the anti-hammer design and the application of high-efficiency materials, multiple goals of environmental protection, economy, energy saving, and thermal insulation are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation pipes, and in particular to a multi-layer composite high-performance anti-corrosion thermal insulation pipe. Background Art

[0002] Insulated energy-saving pipes are widely used in central heating, tap water networks, industrial pipelines and other occasions. They can reduce the thermal loss of the liquid flowing in the insulated pipes, aiming to improve energy efficiency, reduce heat loss, and thus achieve energy conservation and environmental protection.

[0003] High-performance anti-corrosion and thermal insulation pipes are usually used in oil, electricity or heating systems. The inner and outer walls of the pipes are coated with anti-corrosion coatings to resist erosion by corrosive media. In industrial production, multi-layer cavities are set inside and outside the pipes to achieve multi-layer composite insulation, thereby improving the thermal insulation effect of the pipes to achieve energy saving.

[0004] For example, the patent document with the authorization announcement number CN221075582U and the authorization announcement date June 4, 2024, and the name "A thermal insulation structure for a boiler heating pipe" includes an insulation sleeve composed of an arc shell one and an arc shell two, and an insulation cavity is formed between the inner wall of the insulation sleeve and the outer wall of the pipe body, and a refractive layer is coated on the inner wall of the insulation sleeve; this patent can reduce heat conduction, thereby reducing the heat loss inside the pipe body, so as to improve the insulation effect of the pipe body.

[0005] When the medium in the pipeline is flowing, if the valve on the pipeline is suddenly closed, the fluid in the pipeline upstream of the valve will continue to move forward under the action of inertia and accumulate at the valve, which will cause impact on the inner wall of the pipeline at the valve. This is the "water hammer effect".

[0006] In order to alleviate the impact force of the "water hammer effect" on the water pipeline, a one-way valve is set upstream of the valve in the prior art, so that part of the fluid is discharged to the outside when the valve is closed to alleviate the impact force. Obviously, when the liquid transported in the pipeline is toxic, harmful, or has a high purity or is expensive, this method will not only cause a waste of fluid, but may also pollute the environment. Summary of the invention

[0007] The object of the present invention is to provide a multi-layer composite high-performance anti-corrosion and heat-insulating pipeline to solve the above-mentioned deficiencies in the prior art.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A multi-layer composite high-performance anti-corrosion and heat-insulating pipeline, comprising a flow pipe and a valve for opening or closing the flow pipe, wherein the flow pipe is provided with:

[0010] A circulation channel, which is located upstream of the valve and has both ends connected to the flow pipe;

[0011] An anti-water hammer mechanism having a first state of blocking both ends of the circulation channel and a second state of opening both ends of the circulation channel;

[0012] The materials of the flow tube and the circulation channel are both materials with a thermal conductivity of less than 0.3 W / mk.

[0013] In the above-mentioned multi-layer composite high-performance anti-corrosion and heat-insulating pipeline, a sleeve is arranged outside the flow pipe, and a heat-insulating layer is formed between the sleeve and the flow pipe.

[0014] In the above-mentioned multi-layer composite high-performance anti-corrosion and thermal insulation pipeline, the circulation channel is located in the thermal insulation layer.

[0015] In the above-mentioned multi-layer composite high-performance anti-corrosion and heat-insulating pipeline, the outer wall of the flow pipe is configured with a first through hole and a second through hole.

[0016] The above-mentioned multi-layer composite high-performance anti-corrosion and heat-insulating pipe, the anti-water hammer mechanism includes a sealing plate arranged at the first through hole and a non-return assembly arranged at the second through hole.

[0017] The above-mentioned multi-layer composite high-performance anti-corrosion and heat-insulating pipeline, the non-return component includes a sphere located in the flow tube and a first elastic member for forcing the sphere to block the second through hole.

[0018] In the above-mentioned multi-layer composite high-performance anti-corrosion and heat-insulating pipeline, the blocking plate is slidably connected to the outer wall of the flow pipe.

[0019] The above-mentioned multi-layer composite high-performance anti-corrosion and heat-insulating pipeline has a resistance member and a second elastic member for forcing the blocking plate to approach the resistance member in the circulation channel, and a wedge-shaped surface is constructed on the side of the blocking plate close to the flow pipe.

[0020] The above-mentioned multi-layer composite high-performance anti-corrosion and heat-insulating pipeline, the valve includes a main body and a valve plate rotatably connected in the main body.

[0021] In the above-mentioned multi-layer composite high-performance anti-corrosion and heat-insulating pipe, a trigger rod is fixed on the resistance member, and the trigger rod extends to the valve plate. A third elastic member is arranged in the circulation channel for forcing the resistance member to stay away from the blocking plate.

[0022] In the above technical scheme, the present invention provides a multi-layer composite high-performance anti-corrosion and thermal insulation pipe. When the flow pipe is in use, the anti-water hammer mechanism is in the first state to block the circulation channel, so that the fluid can pass through the flow pipe normally. When the valve on the flow pipe is closed, the fluid upstream of the valve will continue to move forward under the action of inertia and accumulate at the valve. At this time, the anti-water hammer mechanism switches to the second state, so that the fluid accumulated upstream of the valve can flow upstream through the circulation channel. In this way, a circulation can be formed between the flow pipe and the circulation channel to alleviate the impact of the fluid on the pipeline at the valve, avoid fluid waste as much as possible, and avoid pollution to the environment outside the flow pipe, which is conducive to the development of industrial energy-saving and thermal insulation technology.

[0023] By selecting the materials for the flow pipe and circulation channel, the thermal conductivity of the overall pipeline is made less than 0.3W / mk, which significantly reduces the heat loss of the pipeline, improves the overall energy efficiency, and achieves energy-saving effects; after the thermal conductivity of the overall pipeline is reduced, the durability and reliability of the pipeline are effectively enhanced, the maintenance cost is reduced, and the service life is extended; through anti-water hammer design and the application of high-efficiency materials, multiple goals of environmental protection, economy, energy saving, and thermal insulation are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a circulation channel structure provided in yet another embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of a blocking plate provided in yet another embodiment of the present invention;

[0028] Figure 4 Another embodiment of the present invention provides Figure 3 The enlarged structural diagram at A in the middle;

[0029] Figure 5 A schematic diagram of a wedge-shaped surface structure provided in yet another embodiment of the present invention;

[0030] Figure 6 A schematic diagram of a trigger rod structure provided by yet another embodiment of the present invention;

[0031] Figure 7 A schematic diagram of the structure of a valve closed according to another embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the sealing cover structure provided in yet another embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Flow pipe; 2. Valve; 3. Circulation channel; 4. Sleeve; 41. Partition; 5. First through hole; 6. Second through hole; 7. Sealing plate; 8. Ball; 9. First elastic member; 10. Resistance member; 11. Second elastic member; 12. Wedge surface; 13. Main body; 14. Valve plate; 15. Trigger rod; 16. Third elastic member; 17. Sealing cover; 18. Connecting rod; 19. Limiting disk; 20. Limiting block; 21. Protruding block. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Reference Figure 1-Figure 8 An embodiment of the present invention provides a multi-layer composite high-performance anti-corrosion and thermal insulation pipeline, including a flow tube 1 and a valve 2 for opening or closing the flow tube 1, a circulation channel 3 and an anti-water hammer mechanism are provided on the flow tube 1, the circulation channel 3 is located upstream of the valve 2 and both ends are connected to the flow tube 1; the anti-water hammer mechanism has a first state of blocking both ends of the circulation channel 3 and a second state of opening both ends of the circulation channel 3, and the materials of the flow tube and the circulation channel are both materials with a thermal conductivity of less than 0.3W / mk.

[0037] Specifically, the innovation of the embodiment of the present invention is that a circulation channel 3 and an anti-water hammer mechanism are arranged on the flow tube 1. The circulation channel 3 can be a pipeline arranged along the length of the flow tube 1, which is upstream of the valve 2 and is connected to the flow tube 1 at both ends; the anti-water hammer mechanism can be a combination of a cylinder and a blocking piece in the prior art, so that the movement of the blocking piece is controlled by the cylinder to block or open the connection point between the circulation channel 3 and the flow tube 1. The advantage of such a setting is that when the valve 2 is opened, the anti-water hammer mechanism is in the first state, at which time the circulation channel 3 is blocked, and the fluid in the flow tube 1 flows normally; when the valve 2 is closed, the anti-water hammer mechanism switches to the second state, at which time the circulation channel 3 is opened, and the fluid upstream of the valve 2 will continue to move forward under the action of inertia and accumulate at the valve 2, and the fluid accumulated at the valve 2 can flow into the opened circulation channel 3 and flow into the flow tube 1 again from the other end of the circulation channel 3, so that the fluid can form a circulation between the circulation channel 3 and the flow tube 1 to alleviate the impact of the fluid on the pipeline at the valve 2 (mitigating the impact force through friction and other resistance); compared with the method in the prior art that the fluid needs to be discharged to the outside to alleviate the impact force, in the embodiment of the present invention, the fluid upstream of the valve 2 does not need to be discharged to the outside, it only needs to flow in the circulation channel 3 upstream of the valve 2 to alleviate the impact force of the fluid on the pipeline, and try to avoid the waste of fluid and pollution of the environment caused by the discharge of the fluid to the outside.

[0038] By selecting the materials for the flow pipe and circulation channel, the thermal conductivity of the overall pipeline is made less than 0.3W / mk, which significantly reduces the heat loss of the pipeline, improves the overall energy efficiency, and achieves energy-saving effects; after the thermal conductivity of the overall pipeline is reduced, the durability and reliability of the pipeline are effectively enhanced, the maintenance cost is reduced, and the service life is extended; through anti-water hammer design and the application of high-efficiency materials, multiple goals of environmental protection, economy, energy saving, and thermal insulation are achieved.

[0039] In each embodiment provided by the present invention, in order to further improve the energy-saving and thermal insulation performance of the pipeline, the material of the flow tube 1 and the sleeve 4 is preferably a material with a low thermal conductivity, such as PVC with a thermal conductivity of less than 0.2 or even rubber foam with a thermal conductivity of 0.05 to form a multi-layer composite insulated pipeline, so that its thermal insulation performance is extremely superior and can almost meet all current national standards and higher industry standards and even enterprise standards.

[0040] The advantages of such a setting are: first, significantly reducing heat loss. By using high-efficiency thermal insulation materials and reasonable structural design, the thermal insulation pipe of the present invention can effectively reduce heat loss and achieve a higher heat energy retention rate. This not only improves the efficiency of conveying fluids, but also reduces energy waste and reduces the energy consumption expenditure of users; second, in traditional pipeline systems, heat loss usually leads to low system operation efficiency. The thermal insulation pipes in various embodiments of the present invention optimize the structure to significantly improve the energy efficiency ratio of the entire system, and can provide higher output flow and heat under the same energy consumption; third, the inner and outer walls of the pipeline will be coated with an anti-corrosion coating to resist the erosion of corrosive media, ensuring that the pipeline can effectively resist corrosion, aging and mechanical damage in a complex environment. This enhanced durability can greatly reduce the maintenance frequency and maintenance cost; fourth, in various embodiments of the present invention, while reducing energy consumption, it helps to reduce greenhouse gas emissions, meet the requirements of sustainable development, and improve energy utilization efficiency; fifth, the combination of anti-water hammer design and low thermal conductivity materials can improve the energy efficiency of the overall pipeline system and meet the transportation requirements of different temperatures, pressures and fluid properties.

[0041] In another embodiment provided by the present invention, further, a sleeve 4 is provided on the outer surface of the flow tube 1, and a heat preservation layer is formed between the sleeve 4 and the flow tube 1. Specifically, the inner diameter of the sleeve 4 is larger than the outer diameter of the flow tube 1 and the two are coaxially arranged, so that a heat preservation layer with a circular cross-section is formed between the sleeve 4 and the flow tube 1; the advantage is that the flow tube 1 can be protected by the sleeve 4; the heat preservation layer can play an effect of isolating heat transfer, and the heat preservation performance of the pipeline is improved as much as possible.

[0042] Preferably, the circulation channel 3 is located in the insulation layer. Specifically, the insulation layer as a whole can also serve as the circulation channel 3, such as Figure 2 As shown, by opening the outer wall of the flow tube 1, both ends of the circulation channel 3 can be connected to the flow tube 1; optionally, the end of the insulation layer close to the valve 2 is the circulation channel 3, such as fixing a partition 41 between the inner wall of the sleeve 4 and the outer wall of the flow tube 1 to isolate the insulation layer and the circulation channel 3 through the partition 41, as shown in FIG. Figure 3 As shown, the advantage is that when the connection point between the circulation channel 3 and the flow tube 1 is opened, the impact force of the "water hammer effect" on the inner wall of the pipeline can be alleviated; when the connection point between the circulation channel 3 and the flow tube 1 is blocked, the fluid in the flow tube 1 flows normally; regardless of whether the circulation channel 3 is opened or not, it can play the role of an insulation layer, so as to cooperate with the sleeve 4 to insulate the flow tube 1 while alleviating the fluid impact force.

[0043] Preferably, the outer wall of the flow pipe 1 is constructed with a first through hole 5 and a second through hole 6. Specifically, the second through hole 6 is located on the side of the first through hole 5 away from the valve 2; multiple first through holes 5 and second through holes 6 can be provided, and when the first through hole 5 and the second through hole 6 are both in a blocked state, it is the first state of the anti-water hammer mechanism, and when the first through hole 5 and the second through hole 6 are both in an open state, it is the second state of the anti-water hammer mechanism, at which time the fluid accumulates at the valve 2 and flows into the circulation channel 3 from the first through hole 5, and then the fluid flows through the circulation channel 3 and flows into the flow pipe 1 again from the second through hole 6, so that the fluid forms a cycle to alleviate the impact force of the "water hammer effect" on the inner wall of the pipeline.

[0044] As an alternative solution for combining the above-mentioned cylinder and the blocking member to block the circulation channel 3, preferably, the anti-water hammer mechanism includes a blocking plate 7 arranged at the first through hole 5 and a check assembly arranged at the second through hole 6. Specifically, in the above-mentioned embodiment, blocking structures need to be arranged at both ends of the circulation channel 3 to block or open the circulation channel 3, that is, the first through hole 5 and the second through hole 6 are both provided with cylinders and blocking members. In this embodiment, the blocking plate 7 is only arranged at the first through hole 5, and the blocking plate 7 can be driven by a linear drive mechanism (such as an electric push rod or cylinder structure in the prior art) to block or open the first through hole 5, while the second through hole 6 is blocked or opened by the check assembly; the check assembly can select a one-way valve structure in the prior art to limit the fluid from flowing into the circulation channel 3 from the second through hole 6 through the one-way valve, that is, the fluid can only flow into the flow tube 1 through the second through hole 6. The advantage of such a setting is that the check assembly can limit the flow of fluid. When the valve 2 is opened, the blocking plate 7 is controlled to block the first through hole 5 so as to block both ends of the circulation channel 3. When the valve 2 is closed, the blocking plate 7 is controlled to open the first through hole 5 so that the fluid can flow into the circulation channel 3 from the first through hole 5, and a certain amount of fluid accumulated in the circulation channel 3 will return to the flow pipe 1 through the second through hole 6, thereby alleviating the impact force of the "water hammer effect" on the inner wall of the pipeline.

[0045] As an alternative to the check valve structure, preferably, the check assembly includes a ball 8 located in the flow tube 1 and a first elastic member 9 for forcing the ball 8 to block the second through hole 6. Specifically, the first elastic member 9 can be an elastic sheet or spring structure in the prior art, one end of which is fixed on the ball 8 and the other end is fixed on the inner wall of the flow tube 1, so as to force the ball 8 to approach the second through hole 6 through the first elastic member 9; the second through hole 6 and the ball 8 are adapted to each other, so that the ball 8 can block the second through hole 6 when it approaches and fits the second through hole 6, thereby limiting the flow of fluid from the second through hole 6 into the circulation channel 3; when the fluid in the flow tube 1 flows into the circulation channel 3, the pressure of the fluid in the circulation channel 3 on the ball 8 increases until the pressure of the fluid on the ball 8 is greater than the elastic force of the first elastic member 9, and the ball 8 moves away from the second through hole 6, so that the fluid flows from the second through hole 6 to the flow tube 1; when the fluid stops flowing into the circulation channel 3, the ball 8 is reset under the action of the first elastic member 9.

[0046] It should be noted that a plurality of check assemblies may be provided along the axial direction and the circumferential direction of the flow tube 1 so that the fluid has multiple circulation paths and the impact force of the fluid on different positions of the flow tube 1 is mitigated as much as possible.

[0047] Furthermore, the blocking plate 7 is slidably connected to the outer wall of the flow tube 1. Specifically, a plurality of first through holes 5 are arranged along the circumference of the flow tube 1; the blocking plate 7 is constructed in a circular ring shape, and its inner wall is constructed as an annular surface that fits with the outer wall of the flow tube 1, so that the blocking plate 7 can fit with the flow tube 1 and slide along the axial direction of the flow tube 1, and when the blocking plate 7 slides to the position of the first through hole 5, multiple first through holes 5 can be blocked at the same time. The advantage of such a setting is that when the blocking plate 7 moves to the position of the first through hole 5, the annular surface can block multiple first through holes 5 at the same time; when the blocking plate 7 is removed from the first through hole 5, the blocking plate 7 no longer blocks the first through hole 5, so that the fluid in the flow tube 1 can flow into the circulation channel 3 through the first through hole 5.

[0048] As an alternative solution for the above-mentioned linear drive mechanism to directly drive the sealing plate 7 to slide axially along the flow tube 1, preferably, a resistance member 10 and a second elastic member 11 for forcing the sealing plate 7 to approach the resistance member 10 are provided in the circulation channel 3, and a wedge surface 12 is constructed on the side of the sealing plate 7 close to the flow tube 1. Specifically, the resistance member 10 is located on the side of the first through hole 5 close to the valve 2, and the second elastic member 11 is located on the side of the sealing plate 7 away from the resistance member 10; the second elastic member 11 can select an elastic sheet or spring structure in the prior art, one end of which is fixed on the outer wall of the flow tube 1, and the other end is fixed on the sealing plate 7, so as to force the sealing plate 7 to approach the resistance member 10 through the second elastic member 11; the resistance member 10 is constructed in a circular ring shape, and its inner wall fits the outer wall of the flow tube 1, so that the resistance member 10 can fit the outer wall of the flow tube 1 and slide along the axial direction of the flow tube 1; in this embodiment, the linear drive mechanism drives the resistance member 10, so that the resistance member 10 can approach or move away from the sealing plate 7 along the axial direction of the flow tube 1; the resistance member 10 is close to One side of the sealing plate 7 is adapted to the end face of the sealing plate 7, and a wedge-shaped surface 12 is constructed between the annular surface and the end face of the sealing plate 7 close to the valve 2. When the linear drive mechanism drives the resistance member 10 away from the first through hole 5, the sealing plate 7 can approach the resistance member 10 under the action of the second elastic member 11 and seal the first through hole 5 through the annular surface. Conversely, when the resistance member 10 approaches the first through hole 5, the sealing plate 7 can be forced to squeeze the second elastic member 11 to move the annular surface away from the first through hole 5, so that the wedge-shaped surface 12 corresponds to the first through hole 5. At this time, the end face of the sealing plate 7 is attached to the side wall of the resistance member 10 under the action of the second elastic member 11, so as to seal multiple first through holes 5 through the sealing plate 7 and the resistance member 10.

[0049] In this way, the position of the blocking plate 7 can be adjusted by controlling the position of the abutment 10, so that the blocking plate 7 always abuts against the abutment 10. When the abutment 10 is on the side away from the first through hole 5, the blocking plate 7 blocks the plurality of first through holes 5 through the annular surface. Figure 6 As shown, at this time, the pressure of the fluid in the flow tube 1 can only force the blocking plate 7 to move away from the flow tube 1, and the force direction of the blocking plate 7 is perpendicular to its sliding direction, that is, the blocking plate 7 will not release the blocking of the first through hole 5 under the action of the fluid in the flow tube 1, which is the first state of the anti-water hammer mechanism; when the valve 2 is closed, the resistance member 10 moves to the side close to the first through hole 5, and at this time, the wedge surface 12 cooperates with the resistance member 10 to block multiple first through holes 5, as shown in FIG. Figure 7As shown, in this state, the fluid impacts the wedge surface 12 under the action of inertia, and the fluid pressure on the wedge surface 12 is divided into a component force perpendicular to the axial direction of the flow tube 1 and a component force along the axial direction of the flow tube 1, wherein the component force along the axial direction of the flow tube 1 can force the sealing plate 7 to squeeze the second elastic member 11 and away from the resistance member 10, so that the fluid can flow into the circulation channel 3 through the gap between the sealing plate 7 and the resistance member 10. At the same time, the fluid in the circulation channel 3 can force the ball 8 to evade, so that the fluid circulates between the circulation channel 3 and the flow tube 1 until the impact force of the fluid in the flow tube 1 dissipates, and the pressure of the fluid itself on the wedge surface 12 cannot force the sealing plate 7 to evade, that is, when the impact force of the fluid dissipates, the sealing plate 7 will cooperate with the resistance member 10 to seal the first through hole 5 again, and at the same time, the ball 8 also seals the first through hole 5 again under the action of the first elastic member 9, which is the second state of the anti-water hammer mechanism. The advantage is that, in this embodiment, the first through hole 5 can be tightly sealed through the first state of the anti-hammer mechanism, and the first through hole 5 and the second through hole 6 can be opened based on the pressure on the inner wall of the pipeline through the second state of the anti-hammer mechanism, so that the fluid can circulate when the first through hole 5 and the second through hole 6 are opened, thereby alleviating the impact force of the fluid on the pipeline, and after the impact force is alleviated, the first through hole 5 and the second through hole 6 are blocked again to avoid the fluid from flowing in the circulation channel 3 as much as possible.

[0050] Furthermore, the valve 2 includes a main body 13 and a valve plate 14 rotatably connected to the main body 13. Specifically, the main body 13 is a tubular structure as a whole, which is integrally constructed with the flow tube 1. A flow channel is constructed in the main body 13, and the diameter of the flow channel is the same as the inner diameter of the flow tube 1, so that the fluid can flow through the flow tube 1 and the flow channel; the valve plate 14 is rotatably connected to the flow channel, and the flow channel can be blocked when the valve plate 14 is perpendicular to the flow channel; the structure of the valve 2 is a prior art and will not be described in detail here.

[0051] As an alternative to the linear drive mechanism driving the resistance member 10 to move, preferably, a trigger rod 15 is fixed on the resistance member 10, and the trigger rod 15 extends to the valve plate 14, and a third elastic member 16 for forcing the resistance member 10 to stay away from the blocking plate 7 is provided in the circulation channel 3. Specifically, a through groove is constructed on the main body 13, and the two ends of the through groove are respectively connected to the flow channel and the circulation channel 3, and the trigger rod 15 is slidably connected in the through groove, one end of the trigger rod 15 extends into the circulation channel 3 and is fixed to the resistance member 10, and the other end extends into the flow channel, and a dynamic sealing structure is provided between the trigger rod 15 and the through groove to avoid fluid leakage when the trigger rod 15 slides in the through groove. The third elastic member 16 can adopt a spring structure in the prior art. The third elastic member 16 is sleeved on the trigger rod 15, one end of which is fixed on the inner wall of the circulation channel 3, and the other end is fixed on the resistance member 10, so that the resistance member 10 is forced to move away from the blocking plate 7 through the third elastic member 16, that is, the resistance member 10 and the trigger rod 15 are forced to move toward the valve plate 14 side; the outer wall of the flow tube 1 is constructed with a protrusion block 21, and the protrusion block 21 is located on the side of the resistance member 10 close to the valve 2, so that the resistance member 10 can be abutted on the protrusion block 21 under the action of the third elastic member 16, and the blocking plate 7 can be abutted on the resistance member 10 under the action of the second elastic member 11.

[0052] When the valve 2 is opened, the valve plate 14 is arranged along the length direction of the flow channel or the flow tube 1, so that the fluid can flow normally through the flow tube 1 and the flow channel. At this time, the resistance member 10 is away from the first through hole 5 and abuts on the protrusion 21 under the action of the third elastic member 16, so that the blocking plate 7 can block the first through hole 5 through the annular surface; when the valve 2 is closed, the valve plate 14 rotates to a position perpendicular to the flow channel to block the flow channel and the flow tube 1. During the rotation of the valve plate 14, it can resist the trigger rod 15 to force the trigger rod 15 to overcome the elastic force of the third elastic member 16 and move to the side of the first through hole 5, thereby driving the resistance member 10 to overcome the elastic force of the third elastic member 16 and squeeze the blocking plate 7, so that the wedge surface 12 of the blocking plate 7 cooperates with the resistance member 10 to block the first through hole 5. The advantage is that the flow tube 1 can be blocked or opened by the valve plate 14. When the valve plate 14 opens the flow tube 1, the blocking plate 7 passively blocks the first through hole 5 through the annular surface, that is, the anti-water hammer mechanism is in the first state. When the valve plate 14 closes the flow tube 1, the blocking plate 7 can be passively forced to move through the trigger rod 15 and other structures to block the first through hole 5 through the wedge surface 12 and the resistance member 10, thereby switching the anti-water hammer mechanism to the second state, which can effectively reduce the impact force of the "water hammer effect" on the pipeline.

[0053] In another embodiment provided by the present invention, further, an opening is constructed on the sleeve 4, and a sealing cover 17 is screwed on the opening. Specifically, in each embodiment of the present invention, the same fluid as that in the flow tube 1 can flow in the circulation channel 3, so that when the anti-water hammer mechanism is in the second state, the fluid can circulate in the circulation channel 3 and the flow tube 1; in order to facilitate the injection of fluid into the circulation channel 3 or the replacement of fluid, an opening is constructed on the sleeve 4, and the opening can be blocked or opened by screwing the sealing cover 17 at the opening. Preferably, a connecting rod 18 is fixed to the inner wall of the sealing cover 17, and a limiting disk 19 is fixed on the connecting rod 18. The limiting disk 19, the connecting rod 18 and the sealing cover 17 are all coaxially fixed and staggered with the second elastic member 11, and a limiting block 20 corresponding to the limiting disk 19 is fixed on the sealing plate 7. When the valve 2 is opened, the anti-water hammer mechanism is in the first state, at which time the sealing plate 7 seals the first through hole 5, and the limiting disk 19 and the limiting block 20 are staggered in the axial direction of the flow tube 1, so that the sealing cover 17 can be screwed to the opening or unscrewed from the opening to inject fluid into the circulation channel 3 or replace the fluid. When the sealing cover 17 is screwed to the opening position, the limiting disk 19 moves to the side of the limiting block 20 close to the flow tube 1, and the limiting block 20 is on the side of the limiting disk 19 away from the flow tube 1. At this time, the closing of the valve 2 can switch the anti-water hammer mechanism to the second state, so as to drive the sealing plate 7 away from the valve 2 through the resistance member 10, so that the limiting block 20 fits the top wall of the limiting disk 19 and is close to the connecting rod 18. The advantage is that when the valve 2 is opened, the anti-water hammer mechanism is in the first state, and the sealing cover 17 can be operated at this time to inject fluid into or replace the fluid in the circulation channel 3; when the valve 2 is closed, the anti-water hammer mechanism switches to the second state, and the sealing plate 7 switches its position to limit the position of the limiting disk 19 through the limiting block 20, so as to avoid the sealing cover 17 from detaching from the opening as much as possible, and to avoid the fluid in the flow tube 1 from being discharged through the circulation channel 3 and the opening as much as possible.

[0054] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-layer composite high-performance anti-corrosion and heat-insulating pipeline, comprising a flow pipe and a valve for opening or closing the flow pipe, characterized in that: The flow tube is provided with: A circulation channel, which is located upstream of the valve and has both ends connected to the flow pipe; An anti-water hammer mechanism having a first state of blocking both ends of the circulation channel and a second state of opening both ends of the circulation channel; The materials of the flow tube and the circulation channel are both materials with a thermal conductivity of less than 0.3W / mk; A sleeve is disposed outside the flow tube, and a heat-insulating layer is formed between the sleeve and the flow tube; The outer wall of the flow tube is configured with a first through hole and a second through hole; The anti-water hammer mechanism comprises a blocking plate arranged at the first through hole and a check assembly arranged at the second through hole, so as to limit the fluid from flowing from the second through hole into the circulation channel through the check assembly; The sealing plate is in the shape of a ring, and its inner wall is in the shape of a ring surface that fits the outer wall of the flow pipe; The circulation channel is provided with a resistance member and a second elastic member for forcing the blocking plate to approach the resistance member, and a wedge-shaped surface is constructed on one side of the blocking plate close to the flow pipe; The resistance member is located on a side of the first through hole close to the valve, and the second elastic member is located on a side of the blocking plate away from the resistance member; the resistance member is constructed in a circular ring shape, and its inner wall is in contact with the outer wall of the flow tube, so that the resistance member can be in contact with the outer wall of the flow tube and slide along the axial direction of the flow tube; When the resistance member is at the side away from the first through hole, the blocking plate blocks the multiple first through holes through the annular surface; when the valve is closed, the resistance member moves to the side close to the first through hole, and at this time, the multiple first through holes can be blocked by the wedge-shaped surface cooperating with the resistance member. In this state, the fluid impacts the wedge-shaped surface under the action of inertia, and the fluid pressure on the wedge-shaped surface can force the blocking plate to squeeze the second elastic member and move away from the resistance member, so that the fluid can flow into the circulation channel through the gap between the blocking plate and the resistance member. At the same time, the fluid in the circulation channel can flow into the flow tube through the second through hole, so that the fluid circulates between the circulation channel and the flow tube. Until the impact force of the fluid in the flow tube dissipates, the blocking plate will cooperate with the resistance member to block the first through hole again; The valve comprises a main body and a valve plate rotatably connected in the main body; A flow passage is constructed in the main body, and the valve plate is rotatably connected in the flow passage; A trigger rod is fixed on the abutment member, and the trigger rod extends to the valve plate. A third elastic member for forcing the abutment member to move away from the blocking plate is arranged in the circulation channel. A through groove is constructed on the main body, and the two ends of the through groove are respectively connected to the flow channel and the circulation channel. The trigger rod is slidably connected in the through groove, one end of the trigger rod extends into the circulation channel and is fixed to the abutment, and the other end extends into the flow channel; The outer wall of the flow pipe is structured with a protrusion, which is located on the side of the resistance member close to the valve, so that the resistance member can resist the protrusion under the action of the third elastic member, and the blocking plate can resist the resistance member under the action of the second elastic member; When the valve is opened, the fluid can flow normally through the flow tube and the flow channel. At this time, the resistance member is moved away from the first through hole and abuts on the protrusion under the action of the third elastic member, so that the sealing plate can seal the first through hole through the annular surface; when the valve is closed, the valve plate rotates to a position perpendicular to the flow channel to seal the flow channel and the flow tube. During the rotation of the valve plate, it can resist the trigger rod to force the trigger rod to overcome the elastic force of the third elastic member and move to the side of the first through hole, thereby driving the resistance member to overcome the elastic force of the third elastic member and squeeze the sealing plate, so that the wedge surface of the sealing plate cooperates with the resistance member to seal the first through hole.

2. The multi-layer composite high-performance anti-corrosion and thermal insulation pipeline according to claim 1 is characterized in that: The non-return assembly comprises a ball located in the flow tube and a first elastic member used for forcing the ball to block the second through hole.

3. The multi-layer composite high-performance anti-corrosion and thermal insulation pipeline according to claim 1 is characterized in that: The blocking plate is slidably connected to the outer wall of the flow tube.

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