Special regulating valve system for steam pipeline

Abstract

The present invention relates to the field of steam pipeline regulation technology, and in particular to a special regulating valve system for steam pipelines, comprising a pipeline transport unit composed of a plurality of interconnected steam pipelines, wherein the inlet end of the pipeline transport unit is connected to the steam outlet of an upstream high-temperature boiler, and the outlet end is connected to a user end, and each of the steam pipelines is connected by a flange, and each of the steam pipelines is fixedly arranged, and a safety emergency unit is installed on each of the steam pipelines, and a safety water collection unit is installed on each of the steam pipelines at the upstream position of the safety emergency unit. The special regulating valve system for steam pipelines can be used in combination to achieve rapid pressure reduction and pressure relief for the entire pipeline transport unit when a fault occurs and causes a surge in internal steam pressure. During the pressure relief process, the first-level pressure reduction and the second-level pressure reduction of each steam pipeline can be automatically completed according to the pressure reduction situation, thereby achieving the effect of rapid overall pressure reduction for the entire pipeline transport unit.

Description

Technical Field

[0001] The present invention relates to the technical field of steam pipeline regulation, and in particular to a valve group structure capable of ensuring the installation and operation of a steam pipeline, in particular to a special regulating valve system for a steam pipeline. Background Art

[0002] Steam pipes generally have good mechanical properties and thermal insulation properties. Under normal circumstances, they can withstand high temperatures of 120°C. Through modification or combination with other insulation materials, they can withstand high temperatures of 180°C. They are suitable for insulation projects of various cold and hot water high and low temperature pipes. Generally, steam pipes need to withstand steam pressure.

[0003] In the process of using steam pipes to transport high-temperature and high-pressure steam in the heating system, if overpressure operation occurs, it is easy to cause the pipes to rupture or leak.

[0004] Therefore, valve structures such as pressure reducing valves and regulating valves are generally installed on steam pipelines.

[0005] For example, a high-temperature steam valve is disclosed in the patent document with patent application number CN201910912227.6, whose main structure is composed of a valve body, a valve cover, a valve disc, a valve core, a first step, and a second step, and the valve core includes a clamping part and a core head.

[0006] It can be seen from the contents recorded in the above patent that the above patent is mainly used to alleviate the vibration problem caused by the pressure fluctuation of the gas-liquid mixed medium. Although it has a certain safety control for the steam pipeline, the effect is not obvious when the steam inside the steam pipeline is over-pressured and it cannot effectively release the pressure. The overall safety pressure control effect is poor.

[0007] In addition, a multi-stage sealed pressure-regulating and temperature-regulating steam valve is also disclosed in the patent document with patent application number CN202220414109.X, whose main structure includes a valve body and a valve cover, the interior of the valve body is provided with a hollow cavity) and a sleeve, the upper and lower ends of the sleeve are sealed with the upper and lower inner walls of the hollow cavity, a valve stem is sleeved in the sleeve, the inner wall of the sleeve is provided with a sleeve boss and a sleeve groove, the outer wall of the valve stem is provided with a valve stem groove and a valve stem boss, when the valve is in a closed state, the sleeve groove and the valve stem boss are limited and sealed, when the valve is in an open state, the valve stem boss and the sleeve groove are clearance matched, the valve stem groove and the sleeve boss are clearance matched, the valve body is also connected to a branch pipe, and a steam cooling nozzle is bypassed on the branch pipe.

[0008] It can be seen from the records in the patent literature of the above-mentioned multi-stage sealed pressure-regulating and temperature-regulating steam valve that it can achieve pressure control and pressure regulation to a certain extent, but its main function is to avoid cavitation and blocked flow and reduce noise. It has no obvious effect on the safe pressure reduction of the entire steam pipeline under a real overpressure state, because it cannot effectively deal with the sudden overpressure problem encountered when the steam pipeline transports high-temperature steam.

[0009] To this end, the present invention proposes a valve group structure and a regulating system that can ensure that the steam pipeline can cope with a sudden pressure increase and ensure the installation and operation of the steam pipeline, so as to better solve the problems existing in the prior art. Summary of the invention

[0010] The present invention is to solve one of the above-mentioned technical problems, and the technical solution adopted is: a special regulating valve system for steam pipes, including a pipe conveying unit composed of a plurality of interconnected steam pipes, the inlet end of the pipe conveying unit is connected to the steam outlet of an upstream high-temperature boiler, and the outlet end is connected to a user end, the steam pipes are respectively connected by flanges, and the steam pipes are fixedly arranged. A safety emergency unit is respectively installed on each of the steam pipes, and a safety water collection unit is installed on the steam pipe at the upstream position of each of the safety emergency units. The safety emergency unit is used to achieve pressure reduction regulation for the steam pipe under a pressure surge state, and the safety water collection unit cooperates with the steam pipe to ensure the stability of the high-temperature steam under the state of transportation.

[0011] In any of the above schemes, it is preferred that the safety emergency unit includes a main control pressure regulating and pressure releasing mechanism and a sub-control pressure regulating and pressure releasing mechanism installed at intervals on the steam pipe, and the main control pressure regulating and pressure releasing mechanism and the sub-control pressure regulating and pressure releasing mechanism are connected through a closed buffer component, and the closed buffer component is used to control the coordinated movement of the main control pressure regulating and pressure releasing mechanism and the sub-control pressure regulating and pressure releasing mechanism to safely reduce the pressure inside the steam pipe when the internal pressure of the steam pipe surges and exceeds a set maximum value.

[0012] In any of the above schemes, it is preferred that the auxiliary control pressure regulating and releasing mechanism comprises a multi-way pressure releasing valve body installed on the steam pipeline, the valve cavity of the multi-way pressure releasing valve body is divided into an upper valve cavity and a lower valve cavity which are interconnected by a middle valve channel, the upper valve cavity is an air inlet end, and the lower valve cavity is an air outlet end, a one-way lifting valve structure is connected to the bottom of the lower valve cavity, an auxiliary pressure releasing pipeline is installed at the bottom of the one-way lifting valve structure, and the closed buffer component is connected to the bottom of the auxiliary pressure releasing pipeline, the closed buffer component is used to receive and store the high-temperature and high-pressure steam discharged from the multi-way pressure releasing valve body, and the end of the multi-way pressure releasing valve body is used to control the connection and disconnection of the main control pressure regulating and releasing mechanism with the inside of the current steam pipeline;

[0013] A valve core is installed in conjunction with the middle valve channel, and a plurality of steam flow channels are arranged on the valve core, the steam flow channels are connected to the upper valve cavity and the lower valve cavity, and a vertical valve stem is fixed on the top of the valve core, the top of the vertical valve stem moves upward and seals through the valve cover on the top of the multi-way pressure relief valve body and extends to the interior of the pneumatic bypass linkage mechanism, the air inlet end of the pneumatic bypass linkage mechanism is connected to the interior of the steam pipeline, and the air return end is connected back to the valve cavity of the multi-way pressure relief valve body, and the pneumatic bypass linkage mechanism drives the opening and closing of the one-way lift valve structure by controlling the lifting of the vertical valve stem.

[0014] In any of the above schemes, it is preferred that the auxiliary control pressure regulating and pressure releasing mechanism is used to achieve primary pressure relief on the current steam pipeline, and the main control pressure regulating and pressure releasing mechanism is controlled by the auxiliary control pressure regulating and pressure releasing mechanism and achieves secondary pressure relief on the current steam pipeline, and the primary pressure relief and the secondary pressure relief cooperate to achieve regulation of the internal pressure of the current steam pipeline, and each of the steam pipelines is equipped with a primary pressure relief and a secondary pressure relief and cooperates to achieve internal safety pressure reduction of the entire pipeline transportation unit.

[0015] In any of the above schemes, preferably, a stop valve is also installed on each of the steam pipes.

[0016] In any of the above schemes, it is preferred that the pneumatic bypass linkage mechanism includes a mounting frame fixedly mounted on the top of the valve cover, a combined rigid sealing chamber is fixedly mounted on the top of the mounting frame, a sealing disk is cooperatively mounted in the inner chamber of the combined rigid sealing chamber, the outer wall of the sealing disk is sealingly abutted against the inner wall of the inner chamber of the combined rigid sealing chamber, the sealing disk seals the inner chamber into an upper sealing chamber cavity and a lower sealing chamber cavity, a primary buffer spring is fixedly mounted in the lower sealing chamber cavity, a plurality of secondary buffer springs are arranged at intervals along the circumference of the top of the primary buffer spring, and the top of each secondary buffer spring is The upper and lower parts of the steam booster and air intake pipe are fixedly mounted on the bottom of the sealing disk, the top movable seal of the vertical valve stem extends to the lower sealing chamber and is fixedly connected to the bottom of the sealing disk, and a steam booster and air intake pipe extending into the interior of the lower sealing chamber is connected to the right side of the lower sealing chamber, the inlet end of the steam booster and air intake pipe is connected to the interior of the steam pipe, and a steam overflow pipe is sealed and connected to the left side of the lower sealing chamber, the end of the steam overflow pipe is connected to the interior of the multi-way pressure relief valve body, the steam overflow pipe is a unidirectional conducting pipeline, and a constant pressure overflow valve and a one-way overflow reflux valve are installed on the steam overflow pipe in sequence from top to bottom.

[0017] In any of the above schemes, it is preferred that the one-way lifting valve structure includes a straight valve tube which is sealed and fixedly connected to the bottom of the lower valve cavity of the multi-way pressure relief valve body, an annular channel disk is fixedly installed inside the straight valve tube, a lifting valve ball is sealed and tightly pressed against the top of the annular channel disk, the top of the lifting valve ball is fixedly connected to a lifting needle column extending into the straight valve tube, the top of the lifting needle column is fixed to the bottom of the vertical valve stem, a lifting and releasing spring is installed inside the straight valve tube above the lifting valve ball, the top of the lifting and releasing spring is pressed against the bottom of the multi-way pressure relief valve body, and the bottom of the straight valve tube is sealed and fixedly connected to the air inlet end of the closed buffer assembly.

[0018] In any of the above schemes, it is preferred that the main control pressure regulating and releasing mechanism includes a pressure-resistant main tank, a drain valve is provided at the bottom outlet of the pressure-resistant main tank, the pressure-resistant main tank is connected to the inside of the steam pipe through a main pressure relief pipeline, and a pneumatic opening and closing valve is installed on the main pressure relief pipeline, and the pneumatic opening and closing valve is used to control the connection or disconnection between the pressure-resistant main tank and the steam pipeline.

[0019] In any of the above schemes, it is preferred that the closed buffer assembly includes a first steel cylinder and a second steel cylinder which are closed and arranged, the top of the first steel cylinder is connected with the auxiliary pressure relief pipe, and the first pressure airbag and the second pressure airbag are respectively arranged inside the first steel cylinder and the second steel cylinder, and the first pressure airbag and the second pressure airbag are filled with an appropriate amount of inert gas, the first pressure airbag is connected with the inside of the second steel cylinder through a connecting steel tube, the second pressure airbag is connected with the pneumatic opening and closing valve of the main control pressure regulating and pressure relief mechanism through an air-conducting steel pipe and is used to control the connection and disconnection of the main control pressure regulating and pressure relief mechanism and the steam pipe, the inner cavity of the first steel cylinder is used to temporarily store steam from the steam pipe and realize the first-level pressure reduction of the steam pipe, and a discharge joint with a sealing plug is sealed and connected to the bottom of the first steel cylinder, and the water vapor accumulated inside the inner cavity of the first steel cylinder is discharged by regularly opening the discharge joint.

[0020] In any of the above schemes, preferably, the safety water collection unit includes a water collection arc bend connected to the water inlet end of the corresponding steam pipe, both ends of the water collection arc bend are connected to the interior of the steam pipe, and a drain joint with a plug is installed at the bottom of the water collection arc bend. The water collection arc bend is used to receive condensed water accumulated inside the steam pipe and to reduce the probability of water hammer. The condensed water accumulated inside the water collection arc bend is discharged by regularly opening the drain joint.

[0021] In any of the above schemes, it is preferred that the pneumatic on-off valve includes an on-off valve body installed on the main pressure relief pipeline, a lifting on-off valve core is installed in the on-off valve cavity of the on-off valve body, the main pressure relief pipeline is fixedly connected to the side walls of the on-off valve body on both sides of the lifting on-off valve core, the lifting on-off valve core is used to control the cut-off or connection of the main pressure relief pipeline, a return spring is installed in the on-off valve body above the lifting on-off valve core, a welded valve pipe is fixedly connected to the bottom of the on-off valve body, and the lifting valve column fixedly connected to the bottom of the lifting on-off valve core is The lower end is movable and sealed and extends to the interior of the welded valve tube. A lifting piston is sealed and installed inside the welded valve tube below the lifting valve column. The end of the gas-guiding steel pipe at the gas outlet end of the closed buffer assembly is sealed and extends to the interior of the welded valve tube below the lifting piston. When the gas-guiding steel pipe discharges high-pressure inert gas to the interior of the welded valve tube below the lifting piston, it pushes the lifting piston to move upward and drives the lifting valve column to move the lifting opening and closing valve core upward. After the lifting opening and closing valve core moves upward, it controls the connection of the main pressure relief pipeline, thereby realizing the control of the connection or disconnection of the pressure-resistant main tank and the steam pipeline.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The special regulating valve system for steam pipeline can be used together to achieve rapid pressure reduction and pressure relief for the entire pipeline transportation unit when a fault occurs and causes a surge in internal steam pressure. During the pressure relief process, the first-level and second-level pressure reduction of each steam pipeline can be automatically completed according to the pressure reduction situation, thereby achieving the effect of overall rapid pressure reduction of the entire pipeline transportation unit.

[0024] 2. The first-stage pressure reduction set here can be used to achieve rapid pressure relief of small capacity. When the pressure inside the steam pipe is still high after the first-stage pressure relief, the first-stage pressure reduction end will automatically control the opening of the second-stage pressure reduction end. The overall linkage is good, which can quickly ensure that the second-stage pressure reduction is opened and complete the large-capacity collection of excess steam, quickly reduce the internal pressure of the steam pipe, and ensure the safety of pipeline transportation.

[0025] 3. In order to reduce the impact and damage of pipes caused by water hammer during steam pipeline transportation, a safety water collection unit is specially set up on each steam pipe to better reduce the water hammer phenomenon, ensure the safe and stable transportation of steam, reduce the vibration caused by water hammer, and extend the service life of the entire pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a schematic diagram of the partial cross-sectional structure of a single steam pipe and its upper components of the present invention.

[0029] Figure 3 It is a schematic diagram of the first partial cross-sectional enlarged structure of the present invention.

[0030] Figure 4 It is a second partial cross-sectional enlarged structural schematic diagram of the present invention.

[0031] In the figure, 1, steam pipe; 2, flange; 3, multi-way pressure relief valve body; 4, middle valve channel; 5, upper valve cavity; 6, lower valve cavity; 7, one-way lifting valve structure; 701, straight valve pipe; 702, annular channel disk; 703, lifting valve ball; 704, lifting needle column; 705, lifting slow-release spring; 8, auxiliary pressure relief pipeline; 9, closed buffer assembly; 901, first steel cylinder; 902, second steel cylinder; 903, first pressure airbag; 904, second pressure airbag; 905, connecting steel pipe; 906, air guide steel pipe;

[0032] 907, discharge joint; 10, valve core; 11, steam flow channel; 12, vertical valve stem; 13, valve cover; 14, stop valve;

[0033] 15. Installation frame; 16. Combined rigid sealed chamber; 17. Sealing plate; 18. Upper sealed chamber cavity; 19. Lower sealed chamber cavity;

[0034] 20. Primary buffer spring; 21. Secondary buffer spring; 22. Steam booster intake pipe; 23. Steam overflow pipe; 24. Constant pressure overflow valve; 25. One-way overflow return valve; 26. Pressure-resistant main tank; 27. Drain valve; 28. Main pressure relief pipeline; 29. ​​Water collecting arc elbow; 30. Drain joint; 31. Lifting opening and closing valve core; 32. Return spring; 33. Welded valve pipe; 34. Lifting valve column; 35. Lifting piston; 36. Opening and closing valve body; A. Pneumatic bypass linkage mechanism; B. Pneumatic opening and closing valve; C. Safety emergency unit. DETAILED DESCRIPTION

[0035] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-4 as shown in .

[0036] Embodiment 1:

[0037] The steam pipeline regulating valve system includes a pipeline transport unit composed of a plurality of interconnected steam pipelines 1, the inlet end of the pipeline transport unit is connected to the upstream high-temperature boiler steam outlet, and the outlet end is connected to the user end. The steam pipelines 1 are connected by flanges 2, and the steam pipelines 1 are fixedly arranged. A safety emergency unit C is installed on each steam pipeline 1, and a safety water collection unit is installed on the steam pipeline 1 at the upstream position of each safety emergency unit. The safety emergency unit is used to reduce the pressure of the steam pipeline 1 under the pressure surge state, and the safety water collection unit cooperates with the steam pipeline 1 to ensure the stability of the high-temperature steam under the state of transportation. The entire pipeline transport unit takes each steam pipeline 1 as a small node unit. The safety emergency unit and the safety water collection unit installed on each steam pipeline 1 can cooperate to ensure the safety of the steam pipeline 1. At the same time, the safety of each steam pipeline 1 can effectively ensure the safe transportation of the entire pipeline transport unit.

[0038] In any of the above schemes, it is preferred that the safety emergency unit includes a main control pressure regulating and pressure releasing mechanism and a sub-control pressure regulating and pressure releasing mechanism installed at intervals on the steam pipe 1, and the main control pressure regulating and pressure releasing mechanism and the sub-control pressure regulating and pressure releasing mechanism are connected through a closed buffer component 9. The closed buffer component 9 is used to control the coordinated movement of the main control pressure regulating and pressure releasing mechanism and the sub-control pressure regulating and pressure releasing mechanism to safely reduce the pressure inside the steam pipe 1 when the internal pressure of the steam pipe 1 surges and exceeds the set maximum value. The safety emergency unit can deal with the phenomenon of a surge in pressure inside the steam pipe 1 caused by a fault. When a surge in pressure inside the steam pipe 1 is sensed, the sub-control pressure regulating and pressure releasing mechanism will achieve rapid linkage feedback, thereby achieving a rapid and small pressure reduction, that is, a first-level pressure reduction. If the pressure surge problem can be controlled after each steam pipe 1 undergoes a first-level pressure reduction, the pressure reduction will be completed at this time. The main control pressure regulating and pressure releasing mechanism is in an idle state to reach the opening pressure. When the first-level pressure reduction cannot effectively reduce the pressure inside the steam pipe 1 to the standard pressure, the sub-control pressure regulating and pressure releasing mechanism will continue to receive steam. When the pressure of the inert gas at the output end of the sub-control pressure regulating and pressure releasing mechanism is greater than the preset pressure of the main control pressure regulating and pressure releasing mechanism, the main control pressure regulating and pressure releasing mechanism will be opened. At this time, the purpose of quickly reducing the pressure inside the steam pipe 1 is achieved, that is, a second-level large-capacity pressure reduction, thereby ensuring the safety of the steam pipe 1 and reducing the problem of pipe rupture caused by continuous excessive pressure.

[0039] In any of the above schemes, it is preferred that the auxiliary control pressure regulating and releasing mechanism includes a multi-way pressure relief valve body 3 installed on the steam pipe 1, and the valve cavity of the multi-way pressure relief valve body 3 is divided into an upper valve cavity 5 and a lower valve cavity 6 that are interconnected by a middle valve channel 4, the upper valve cavity 5 is an air inlet end, and the lower valve cavity 6 is an air outlet end, and a one-way pull-up valve structure 7 is connected to the bottom of the lower valve cavity 6, and a secondary pressure relief pipeline 8 is installed at the bottom of the one-way pull-up valve structure 7, and the closed buffer component 9 is connected to the bottom of the auxiliary pressure relief pipeline 8, and the closed buffer component 9 is used for receiving and storing high-temperature and high-pressure steam discharged from the multi-way pressure relief valve body 3, and the end of the multi-way pressure relief valve body 3 is used to control the connection and disconnection of the main control pressure regulating and releasing mechanism with the inside of the current steam pipe 1. In the auxiliary control pressure regulating and releasing mechanism set here, the upper valve chamber 5 and the lower valve chamber 6 are always in a connected state. When the internal pressure is too high, the pneumatic bypass linkage mechanism A will control the opening of the one-way pull valve structure 7, which will eventually allow the high-pressure steam to directly enter the closed buffer component 9 from the one-way pull valve structure 7 in the open state for storage, thereby reducing the pressure inside the steam pipe 1.

[0040] A valve core 10 is installed in cooperation with the middle valve channel 4, and a plurality of steam flow channels 11 are arranged on the valve core 10. The steam flow channels 11 are connected to the upper valve cavity 5 and the lower valve cavity 6. A vertical valve stem 12 is fixed on the top of the valve core 10. The top of the vertical valve stem 12 moves upward and seals through the valve cover 13 on the top of the multi-way pressure relief valve body 3 and extends to the interior of the pneumatic bypass linkage mechanism A. The air inlet end of the pneumatic bypass linkage mechanism A is connected to the interior of the steam pipe 1, and the air return end is connected back to the valve cavity of the multi-way pressure relief valve body 3. The pneumatic bypass linkage mechanism A drives the opening and closing of the one-way lifting valve structure 7 by controlling the lifting and lowering of the vertical valve stem 12. When the pneumatic bypass linkage mechanism A is working, it mainly continuously receives high-temperature and high-pressure steam from the steam pipe 1. Then, the steam entering the pneumatic bypass linkage mechanism A will push the vertical valve stem 12 upward to overcome the resistance and pull it upward. After being pulled, the vertical valve stem 12 will drive the lifting valve ball 703 connected to its bottom to move upward and open the one-way lifting valve structure 7 in the blocked state. At this time, the high-pressure steam will pass through the one-way lifting valve structure 7 into the auxiliary pressure relief pipe 8, and then enter the first steel cylinder 901 connected to it for storage, thereby realizing the first-level pressure relief.

[0041] In any of the above schemes, it is preferred that the auxiliary control pressure regulating and releasing mechanism is used to realize the primary pressure relief of the current steam pipeline 1, and the main control pressure regulating and releasing mechanism is controlled by the auxiliary control pressure regulating and releasing mechanism and realizes the secondary pressure relief of the current steam pipeline 1. The primary pressure relief and the secondary pressure relief cooperate to realize the regulation of the internal pressure of the current steam pipeline 1. Each of the steam pipelines 1 is equipped with a primary pressure relief and a secondary pressure relief and cooperates to realize the internal safety pressure reduction of the entire pipeline transportation unit. The primary pressure relief can realize the discharge of small-capacity steam and complete the initial pressure reduction. When the initial pressure reduction cannot meet the requirements, the secondary pressure reduction will be automatically started. The cooperation of the primary pressure reduction and the secondary pressure reduction can better and faster ensure the safe pressure reduction inside the steam pipeline 1.

[0042] In any of the above schemes, it is preferred that a stop valve 14 is also installed in each of the steam pipes 1. Controlling the opening of the stop valve 14 can control the opening and closing of the entire steam pipe 1, which is convenient for inspection and maintenance, and can also control the flow of the steam pipe 1.

[0043] In any of the above schemes, it is preferred that the pneumatic bypass linkage mechanism A includes an installation frame 15 fixedly installed on the top of the valve cover 13, a combined rigid sealing chamber 16 is fixedly installed on the top of the installation frame 15, and a sealing disk 17 is installed in the inner chamber of the combined rigid sealing chamber 16, the outer wall of the sealing disk 17 is sealingly abutted against the inner wall of the inner chamber of the combined rigid sealing chamber 16, and the sealing disk 17 seals and divides the inner chamber into an upper sealing chamber cavity 18 and a lower sealing chamber cavity 19, and a first-level buffer spring 20 is fixedly installed in the lower sealing chamber cavity 19, and a plurality of second-level buffer springs 21 are arranged at intervals along the circumference of the top of the first-level buffer spring 20, and each of the second-level buffer springs 21 has a The tops are fixedly installed on the bottom of the sealing disk 17, the top movable seal of the vertical valve stem 12 extends to the lower sealing chamber 19 and is fixedly connected to the bottom of the sealing disk 17, and a steam booster intake pipe 22 is connected to the right side of the lower sealing chamber 19 and extends thereinto in a sealed manner, and the inlet end of the steam booster intake pipe 22 is connected to the interior of the steam pipe 1, and a steam overflow pipe 23 is sealed and connected to the left side of the lower sealing chamber 19, and the end of the steam overflow pipe 23 is connected to the interior of the multi-way pressure relief valve body 3. The steam overflow pipe 23 is a unidirectional conducting pipeline, and a constant pressure overflow valve 24 and a one-way overflow reflux valve 25 are installed on the steam overflow pipe 23 in sequence from top to bottom.

[0044] When the pneumatic bypass linkage mechanism A is working, the high-pressure and high-temperature steam in the steam pipe 1 will enter the lower sealing chamber 19 of the combined rigid sealing chamber 16 through the steam booster intake pipe 22. As the steam continues to enter, the pressure in the lower sealing chamber 19 will continue to increase and be greater than the pressure in the upper sealing chamber 18, thereby driving the sealing disk 17 to overcome the pressure of the spring and other resistances to control the entire sealing disk 17 to move upward, and at this time, the vertical valve stem 12 connected thereto will be driven to move upward. When the vertical valve stem 12 moves upward, it will bring The lifting valve ball 703 fixed at its bottom moves upward, thereby controlling the opening of the one-way lifting valve structure 7. At this time, the high-pressure steam inside the steam pipe 1 will immediately enter the first steel cylinder 901 of the closed buffer assembly 9 for storage and complete the first-level pressure reduction. When the internal pressure reaches the standard value, each first-level buffer spring 20 and second-level buffer spring 21 will drive the sealing disk 17 to move downward according to their own elastic force, thereby driving the vertical valve stem 12 to move downward into place, and finally driving the lifting valve ball 703 to close the one-way lifting valve structure 7, and the first-level pressure reduction is completed. If the pressure inside the steam pipe 1 is still high after the first-stage pressure reduction, the high-pressure steam will continue to enter the lower sealed chamber 19 through the steam booster intake pipe 22. When the pressure inside the lower sealed chamber 19 reaches the set value, the constant pressure relief valve 24 on the steam overflow pipe 23 will open, so that the steam that will continue to enter the lower sealed chamber 19 under the action of the constant pressure relief valve 24 and the one-way overflow return valve 25 will be directly diverted to the inside of the multi-way pressure relief valve body 3, so as to achieve the purpose of ensuring the stability of the maximum pressure inside the combined rigid sealed chamber 16 and ensure the safety of the combined rigid sealed chamber 16. The preset pressures of the first-stage buffer spring 20 and the second-stage buffer spring 21 are selected according to needs, and the first-stage buffer spring 20 and the second-stage buffer spring 21 can achieve secondary buffering and pre-compression to ensure the stability of movement.

[0045] In any of the above schemes, it is preferred that the one-way lifting valve structure 7 includes a straight valve tube 701 which is sealed and fixedly connected to the bottom of the lower valve cavity 6 of the multi-way pressure relief valve body 3, and an annular channel disk 702 is fixedly installed inside the straight valve tube 701. A lifting valve ball 703 is sealed and tightly pressed against the top of the annular channel disk 702. The top of the lifting valve ball 703 is fixedly connected to a lifting needle column 704 extending into the straight valve tube 701, and the top of the lifting needle column 704 is fixed to the bottom of the vertical valve stem 12. A lifting and releasing spring 705 is installed inside the straight valve tube 701 above the lifting valve ball 703, and the top of the lifting and releasing spring 705 is abutted against the bottom of the multi-way pressure relief valve body 3. The bottom of the straight valve tube 701 is sealed and fixedly connected to the air inlet end of the closed buffer assembly 9. The opening of the one-way lifting valve structure 7 is mainly due to the lifting valve ball 703 being driven by the lifting needle column 704 and the vertical valve stem 12 fixed on its upper part. When the vertical valve stem 12 moves upward, it will drive the lifting valve ball 703 to move upward and open the channel at the annular channel disk 702, thereby realizing the opening of the one-way lifting valve structure 7, ensuring that the steam in the steam pipe 1 flows downward to the first steel cylinder 901 of the closed buffer assembly 9 for storage, thereby achieving pressure reduction. The lifting release spring 705 arranged here mainly serves the purpose of cooperating to achieve the preset pressure.

[0046] In any of the above schemes, it is preferred that the main control pressure regulating and releasing mechanism includes a pressure-resistant main tank 26, a drain valve 27 is provided at the bottom outlet of the pressure-resistant main tank 26, the pressure-resistant main tank 26 is connected to the inside of the steam pipe 1 through the main pressure relief pipeline 28, and a pneumatic opening and closing valve B is installed on the main pressure relief pipeline 28, and the pneumatic opening and closing valve B is used to control the connection or disconnection between the pressure-resistant main tank 26 and the steam pipe 1. When the pneumatic opening and closing valve B is opened, a two-stage pressure reduction will be achieved, that is, the steam with high pressure standard pressure inside the steam pipe 1 will continuously enter the pressure-resistant main tank 26 for storage, thereby reducing the pressure inside the steam pipe 1. The large storage capacity of the pressure-resistant main tank 26 can achieve effective pressure reduction. After the pressure reduction is completed, regular maintenance and opening of the drain valve 27 on the pressure-resistant main tank 26 can regularly discharge the stored water to ensure the effective space inside the pressure-resistant main tank 26.

[0047] In any of the above schemes, it is preferred that the closed buffer assembly 9 includes a first steel cylinder 901 and a second steel cylinder 902 which are closed, the top of the first steel cylinder 901 is connected to the secondary pressure relief pipe 8, a first pressure airbag 903 and a second pressure airbag 904 are respectively arranged inside the first steel cylinder 901 and the second steel cylinder 902, the first pressure airbag 903 and the second pressure airbag 904 are filled with an appropriate amount of inert gas, the first pressure airbag 903 is connected to the second steel cylinder 902 through a steel pipe 905, and the second pressure airbag 904 is connected to the second steel cylinder 902. The first steel cylinder 901 and the second steel cylinder 901 are connected to each other, the second pressure airbag 904 is connected to the pneumatic opening and closing valve B of the main control pressure regulating and pressure releasing mechanism through the air guide steel pipe 906 and is used to control the connection and disconnection of the main control pressure regulating and pressure releasing mechanism and the steam pipe 1. The inner cavity of the first steel cylinder 901 is used to temporarily store the steam from the steam pipe 1 and realize the first-level pressure reduction of the steam pipe 1. A discharge joint 907 with a sealing plug is sealed and connected to the bottom of the first steel cylinder 901. The water vapor accumulated inside the inner cavity of the first steel cylinder 901 is discharged by regularly opening the discharge joint 907. The closed buffer assembly 9 receives steam from the steam pipe 1 by opening the one-way lifting valve structure 7. The steam enters the first steel cylinder 901. As the steam increases, the internal pressure increases, thereby continuously compressing the first pressure airbag 903. When the first pressure airbag 903 is compressed, the pressure inside the second steel cylinder 902 connected thereto will continue to increase. When the internal pressure inside the second steel cylinder 902 increases, the second pressure airbag 904 will be continuously compressed. The inert gas inside the second pressure airbag 904 will cooperate with the pneumatic opening and closing valve B of the main control pressure regulating and pressure relief mechanism along the air guide steel pipe 906 and drive the pneumatic opening and closing valve B to open, thereby connecting the steam pipe 1 with the pressure-resistant main tank 26 to achieve secondary pressure relief and ensure rapid pressure relief. The accumulated water can be discharged by opening the discharge joint 907 through regular maintenance, reserving space for the inside of the first steel cylinder 901.

[0048] Embodiment 2:

[0049] A special regulating valve system for steam pipes includes a pipe conveying unit composed of a plurality of interconnected steam pipes 1, wherein the inlet end of the pipe conveying unit is connected to the steam outlet of an upstream high-temperature boiler, and the outlet end is connected to a user end, and each of the steam pipes 1 is connected via a flange 2, each of the steam pipes 1 is fixedly arranged, and a safety emergency unit is installed on each of the steam pipes 1, and a safety water collection unit is installed on the steam pipe 1 at the upstream position of each of the safety emergency units, and the safety emergency unit is used to achieve pressure reduction regulation for the steam pipe 1 in a pressure surge state, and the safety water collection unit cooperates with the steam pipe 1 to ensure the stability of the high-temperature steam in the state of transportation.

[0050] The entire pipeline transportation unit uses each steam pipe 1 as a small node unit. The safety emergency unit and the safety water collection unit set on each steam pipe 1 can cooperate to ensure the safety of the steam pipe 1. At the same time, only when each steam pipe 1 is safe can the safe transportation of the entire pipeline transportation unit be effectively guaranteed.

[0051] In any of the above schemes, it is preferred that the safety emergency unit includes a main control pressure regulating and pressure releasing mechanism and a sub-control pressure regulating and pressure releasing mechanism installed at intervals on the steam pipe 1, and the main control pressure regulating and pressure releasing mechanism and the sub-control pressure regulating and pressure releasing mechanism are connected through a closed buffer component 9. The closed buffer component 9 is used to control the coordinated movement of the main control pressure regulating and pressure releasing mechanism and the sub-control pressure regulating and pressure releasing mechanism to safely reduce the pressure inside the steam pipe 1 when the internal pressure of the steam pipe 1 surges and exceeds the set maximum value.

[0052] The safety emergency unit can deal with the phenomenon of a surge in pressure inside the steam pipe 1 caused by a fault. When a surge in pressure inside the steam pipe 1 is sensed, the sub-control pressure regulating and pressure releasing mechanism will achieve rapid linkage feedback, thereby achieving a rapid and small pressure reduction, that is, a first-level pressure reduction. If the pressure surge problem can be controlled after each steam pipe 1 undergoes a first-level pressure reduction, the pressure reduction will be completed at this time. The main control pressure regulating and pressure releasing mechanism is in an idle state to reach the opening pressure. When the first-level pressure reduction cannot effectively reduce the pressure inside the steam pipe 1 to the standard pressure, the sub-control pressure regulating and pressure releasing mechanism will continue to receive steam. When the pressure of the inert gas at the output end of the sub-control pressure regulating and pressure releasing mechanism is greater than the preset pressure of the main control pressure regulating and pressure releasing mechanism, the main control pressure regulating and pressure releasing mechanism will be opened. At this time, the purpose of quickly reducing the pressure inside the steam pipe 1 is achieved, that is, a second-level large-capacity pressure reduction, thereby ensuring the safety of the steam pipe 1 and reducing the problem of pipe rupture caused by continuous excessive pressure.

[0053] In any of the above schemes, it is preferred that the auxiliary control pressure regulating and releasing mechanism includes a multi-way pressure relief valve body 3 installed on the steam pipe 1, and the valve cavity of the multi-way pressure relief valve body 3 is divided into an upper valve cavity 5 and a lower valve cavity 6 that are interconnected by a middle valve channel 4, the upper valve cavity 5 is an air inlet end, and the lower valve cavity 6 is an air outlet end, and a one-way pull-up valve structure 7 is connected to the bottom of the lower valve cavity 6, and a secondary pressure relief pipeline 8 is installed at the bottom of the one-way pull-up valve structure 7, and the closed buffer component 9 is connected to the bottom of the auxiliary pressure relief pipeline 8, and the closed buffer component 9 is used for receiving and storing high-temperature and high-pressure steam discharged from the multi-way pressure relief valve body 3, and the end of the multi-way pressure relief valve body 3 is used to control the connection and disconnection of the main control pressure regulating and releasing mechanism with the inside of the current steam pipe 1.

[0054] In the auxiliary control pressure regulating and releasing mechanism set here, the upper valve chamber 5 and the lower valve chamber 6 are always in a connected state. When the internal pressure is too high, the pneumatic bypass linkage mechanism A will control the opening of the one-way pull valve structure 7, which will eventually allow the high-pressure steam to directly enter the closed buffer component 9 from the one-way pull valve structure 7 in the open state for storage, thereby reducing the pressure inside the steam pipe 1.

[0055] A valve core 10 is installed in cooperation with the middle valve channel 4, and a plurality of steam flow channels 11 are arranged on the valve core 10. The steam flow channels 11 are connected to the upper valve cavity 5 and the lower valve cavity 6. A vertical valve stem 12 is fixed on the top of the valve core 10. The top of the vertical valve stem 12 moves upward and seals through the valve cover 13 on the top of the multi-way pressure relief valve body 3 and extends to the interior of the pneumatic bypass linkage mechanism A. The air inlet end of the pneumatic bypass linkage mechanism A is connected to the interior of the steam pipe 1, and the air return end is connected back to the valve cavity of the multi-way pressure relief valve body 3. The pneumatic bypass linkage mechanism A drives the opening and closing of the one-way lifting valve structure 7 by controlling the lifting and lowering of the vertical valve stem 12.

[0056] When the pneumatic bypass linkage mechanism A is working, it mainly continuously receives high-temperature and high-pressure steam from the steam pipe 1. Then, the steam entering the pneumatic bypass linkage mechanism A will push the vertical valve stem 12 upward to overcome the resistance and pull it upward. After being pulled, the vertical valve stem 12 will drive the lifting valve ball 703 connected to its bottom to move upward and open the one-way lifting valve structure 7 in the blocked state. At this time, the high-pressure steam will pass through the one-way lifting valve structure 7 into the auxiliary pressure relief pipe 8, and then enter the first steel cylinder 901 connected to it for storage, thereby realizing the first-level pressure relief.

[0057] In any of the above schemes, it is preferred that the auxiliary control pressure regulating and pressure releasing mechanism is used to achieve primary pressure relief on the current steam pipe 1, and the main control pressure regulating and pressure releasing mechanism is controlled by the auxiliary control pressure regulating and pressure releasing mechanism and achieves secondary pressure relief on the current steam pipe 1, and the primary pressure relief and the secondary pressure relief cooperate to achieve the regulation of the internal pressure of the current steam pipe 1, and each of the steam pipes 1 is equipped with a primary pressure relief and a secondary pressure relief and cooperates to achieve internal safety pressure reduction of the entire pipeline transportation unit.

[0058] The primary pressure relief can achieve a small volume of steam discharge and complete the initial pressure reduction. When the initial pressure reduction cannot meet the requirements, the secondary pressure reduction will be automatically started. The coordination of the primary and secondary pressure reductions can better and faster ensure the safe pressure reduction inside the steam pipe 1.

[0059] In any of the above schemes, it is preferred that a stop valve 14 is also installed in each of the steam pipes 1. Controlling the opening of the stop valve 14 can control the opening and closing of the entire steam pipe 1, which is convenient for inspection and maintenance, and can also control the flow of the steam pipe 1.

[0060] In any of the above schemes, it is preferred that the pneumatic bypass linkage mechanism A includes an installation frame 15 fixedly installed on the top of the valve cover 13, a combined rigid sealing chamber 16 is fixedly installed on the top of the installation frame 15, and a sealing disk 17 is installed in the inner chamber of the combined rigid sealing chamber 16, the outer wall of the sealing disk 17 is sealingly abutted against the inner wall of the inner chamber of the combined rigid sealing chamber 16, and the sealing disk 17 seals and divides the inner chamber into an upper sealing chamber cavity 18 and a lower sealing chamber cavity 19, and a first-level buffer spring 20 is fixedly installed in the lower sealing chamber cavity 19, and a plurality of second-level buffer springs 21 are arranged at intervals along the circumference of the top of the first-level buffer spring 20, and each of the second-level buffer springs 21 has a The tops are fixedly installed on the bottom of the sealing disk 17, the top movable seal of the vertical valve stem 12 extends to the lower sealing chamber 19 and is fixedly connected to the bottom of the sealing disk 17, and a steam booster intake pipe 22 is connected to the right side of the lower sealing chamber 19 and extends thereinto in a sealed manner, and the inlet end of the steam booster intake pipe 22 is connected to the interior of the steam pipe 1, and a steam overflow pipe 23 is sealed and connected to the left side of the lower sealing chamber 19, and the end of the steam overflow pipe 23 is connected to the interior of the multi-way pressure relief valve body 3. The steam overflow pipe 23 is a unidirectional conducting pipeline, and a constant pressure overflow valve 24 and a one-way overflow reflux valve 25 are installed on the steam overflow pipe 23 in sequence from top to bottom.

[0061] When the pneumatic bypass linkage mechanism A is working, the high-pressure and high-temperature steam in the steam pipe 1 will enter the lower sealing chamber 19 of the combined rigid sealing chamber 16 through the steam booster intake pipe 22. As the steam continues to enter, the pressure in the lower sealing chamber 19 will continue to increase and be greater than the pressure in the upper sealing chamber 18, thereby driving the sealing disk 17 to overcome the pressure of the spring and other resistances to control the entire sealing disk 17 to move upward, and at this time, the vertical valve stem 12 connected thereto will be driven to move upward. When the vertical valve stem 12 moves upward, it will bring The lifting valve ball 703 fixed at its bottom moves upward, thereby controlling the opening of the one-way lifting valve structure 7. At this time, the high-pressure steam inside the steam pipe 1 will immediately enter the first steel cylinder 901 of the closed buffer assembly 9 for storage and complete the first-level pressure reduction. When the internal pressure reaches the standard value, each first-level buffer spring 20 and second-level buffer spring 21 will drive the sealing disk 17 to move downward according to their own elastic force, thereby driving the vertical valve stem 12 to move downward into place, and finally driving the lifting valve ball 703 to close the one-way lifting valve structure 7, and the first-level pressure reduction is completed.

[0062] If the pressure inside the steam pipe 1 is still high after the first level of pressure reduction, the high-pressure steam will continue to enter the lower sealed chamber 19 through the steam booster intake pipe 22. When the pressure inside the lower sealed chamber 19 reaches the set value, the constant-pressure relief valve 24 on the steam overflow pipe 23 will open. Under the action of the constant-pressure relief valve 24 and the one-way relief reflux valve 25, the steam that will continue to enter the lower sealed chamber 19 will be directly diverted to the interior of the multi-way pressure relief valve body 3, so as to achieve the purpose of ensuring the stability of the maximum pressure inside the combined rigid sealed chamber 16 and ensure the safety of the combined rigid sealed chamber 16.

[0063] The preset pressures of the primary buffer spring 20 and the secondary buffer spring 21 are selected according to needs. At the same time, the primary buffer spring 20 and the secondary buffer spring 21 can be used to achieve secondary buffering and pre-compression to ensure the smoothness of movement.

[0064] In any of the above schemes, it is preferred that the one-way lifting valve structure 7 includes a straight valve tube 701 which is sealed and fixedly connected to the bottom of the lower valve cavity 6 of the multi-way pressure relief valve body 3, and an annular channel disk 702 is fixedly installed inside the straight valve tube 701. A lifting valve ball 703 is sealed and tightly pressed against the top of the annular channel disk 702. The top of the lifting valve ball 703 is fixedly connected to a lifting needle column 704 extending into the straight valve tube 701, and the top of the lifting needle column 704 is fixed to the bottom of the vertical valve stem 12. A lifting and releasing spring 705 is installed inside the straight valve tube 701 above the lifting valve ball 703, and the top of the lifting and releasing spring 705 is abutted against the bottom of the multi-way pressure relief valve body 3. The bottom of the straight valve tube 701 is sealed and fixedly connected to the air inlet end of the closed buffer assembly 9.

[0065] The opening of the one-way lifting valve structure 7 is mainly due to the lifting valve ball 703 being driven by the lifting needle column 704 and the vertical valve stem 12 fixed on its upper part. When the vertical valve stem 12 moves upward, it will drive the lifting valve ball 703 to move upward and open the channel at the annular channel disk 702, thereby realizing the opening of the one-way lifting valve structure 7, ensuring that the steam in the steam pipe 1 flows downward to the first steel cylinder 901 of the closed buffer assembly 9 for storage, thereby achieving pressure reduction. The lifting release spring 705 arranged here mainly serves the purpose of cooperating to achieve the preset pressure.

[0066] In any of the above schemes, it is preferred that the main control pressure regulating and releasing mechanism includes a pressure-resistant main tank 26, a drain valve 27 is provided at the bottom outlet of the pressure-resistant main tank 26, the pressure-resistant main tank 26 is connected to the inside of the steam pipe 1 through a main pressure relief pipeline 28, and a pneumatic opening and closing valve B is installed on the main pressure relief pipeline 28, and the pneumatic opening and closing valve B is used to control the connection or disconnection of the pressure-resistant main tank 26 and the steam pipe 1.

[0067] When the pneumatic opening and closing valve B is opened, two-level pressure reduction will be achieved, that is, the steam with high-pressure standard pressure inside the steam pipe 1 will continuously enter the pressure-resistant main tank 26 for storage, thereby reducing the pressure inside the steam pipe 1. The large storage capacity of the pressure-resistant main tank 26 can achieve effective pressure reduction. After the pressure reduction is completed, regular maintenance and opening of the drain valve 27 on the pressure-resistant main tank 26 can regularly discharge the stored water to ensure the effective space inside the pressure-resistant main tank 26.

[0068] In any of the above schemes, it is preferred that the closed buffer assembly 9 includes a first steel cylinder 901 and a second steel cylinder 902 which are closed, the top of the first steel cylinder 901 is connected to the secondary pressure relief pipe 8, a first pressure airbag 903 and a second pressure airbag 904 are respectively arranged inside the first steel cylinder 901 and the second steel cylinder 902, the first pressure airbag 903 and the second pressure airbag 904 are filled with an appropriate amount of inert gas, the first pressure airbag 903 is connected to the second steel cylinder 902 through a steel pipe 905, and the second pressure airbag 904 is connected to the second steel cylinder 902. The first steel cylinder 901 and the second steel cylinder 901 are connected to each other, the second pressure airbag 904 is connected to the pneumatic opening and closing valve B of the main control pressure regulating and pressure releasing mechanism through the air guide steel pipe 906 and is used to control the connection and disconnection of the main control pressure regulating and pressure releasing mechanism and the steam pipe 1. The inner cavity of the first steel cylinder 901 is used to temporarily store the steam from the steam pipe 1 and realize the first-level pressure reduction of the steam pipe 1. A discharge joint 907 with a sealing plug is sealed and connected to the bottom of the first steel cylinder 901. The water vapor accumulated inside the inner cavity of the first steel cylinder 901 is discharged by regularly opening the discharge joint 907.

[0069] The closed buffer assembly 9 receives steam from the steam pipe 1 by opening the one-way pull valve structure 7. The steam enters the first steel cylinder 901. As the steam increases, the internal pressure increases, thereby continuously compressing the first pressure airbag 903. When the first pressure airbag 903 is compressed, the pressure inside the second steel cylinder 902 connected thereto will continue to increase. When the internal pressure inside the second steel cylinder 902 increases, the second pressure airbag 904 will be continuously compressed. The inert gas inside the second pressure airbag 904 will cooperate with the pneumatic opening and closing valve B of the main control pressure regulating and pressure relief mechanism along the air guide steel pipe 906 and drive the pneumatic opening and closing valve B to open, thereby connecting the steam pipe 1 with the pressure-resistant main tank 26 to achieve secondary pressure relief and ensure rapid pressure relief.

[0070] The accumulated water can be discharged by opening the discharge joint 907 through regular maintenance, thereby reserving space for the interior of the first steel cylinder 901 .

[0071] In any of the above schemes, it is preferred that the safety water collection unit includes a water collection arc bend 29 connected to the water inlet end of the corresponding steam pipe 1, both ends of the water collection arc bend 29 are connected to the interior of the steam pipe 1, and a drain joint 30 with a plug is installed at the bottom of the water collection arc bend 29. The water collection arc bend 29 is used to receive condensed water accumulated inside the steam pipe 1 and to reduce the probability of water hammer. The condensed water accumulated inside the water collection arc bend 29 is discharged by regularly opening the drain joint 30.

[0072] The condensed water inside the steam pipe 1 will sink to the bottom of the pipe and be forced to be transported forward with the movement of the steam. When passing through the water collecting arc bend pipe 29, the bottom of the water collecting arc bend pipe 29 drops, so a large amount of condensed water will accumulate here and no longer move forward. Therefore, the probability of water hammer can be reduced. The condensed water accumulated inside the water collecting arc bend pipe 29 can be discharged by regularly opening the drain joint 30.

[0073] In any of the above schemes, it is preferred that the pneumatic on-off valve B includes an on-off valve body 36 installed on the main pressure relief pipeline 28, and a lifting on-off valve core 31 is installed in the on-off valve cavity of the on-off valve body 36. The main pressure relief pipeline 28 is fixedly connected to the side walls of the on-off valve body 36 on both sides of the lifting on-off valve core 31, and the lifting on-off valve core 31 is used to control the cutoff or connection of the main pressure relief pipeline 28. A return spring 32 is installed in the on-off valve body 36 above the lifting on-off valve core 31, and a welded valve pipe 33 is fixedly connected to the bottom of the on-off valve body 36. The lower part of the lifting valve column 34 fixedly connected to the bottom of the lifting on-off valve core 31 The end is movable and sealed to extend into the interior of the welding valve tube 33, and a lifting piston 35 is sealed and installed in the welding valve tube 33 below the lifting valve column 34. The end of the air guide steel pipe 906 at the air outlet end of the closed buffer assembly 9 is sealed to extend into the interior of the welding valve tube 33 below the lifting piston 35. When the air guide steel pipe 906 discharges high-pressure inert gas to the interior of the welding valve tube 33 below the lifting piston 35, it will push the lifting piston 35 to move upward and drive the lifting valve column 34 to move the lifting opening and closing valve core 31 upward. After the lifting opening and closing valve core 31 moves upward, it will control the connection of the main pressure relief pipeline 28, thereby realizing the control of the connection or disconnection of the pressure-resistant main tank 26 and the steam pipe 1.

[0074] When the internal pressure of the second steel cylinder 902 increases, the second pressure airbag 904 will be continuously compressed, and the inert gas inside the second pressure airbag 904 will cooperate with the pneumatic opening and closing valve B of the main control pressure regulating and pressure releasing mechanism along the air guide steel pipe 906 and drive the lifting piston 35 on the pneumatic opening and closing valve B to move upward. When the lifting piston 35 moves upward, it will drive the lifting valve column 34 and the lifting opening and closing valve core 31 to move upward, thereby controlling the connection of the main pressure relief pipeline 28, thereby controlling the connection between the pressure-resistant main tank 26 and the steam pipe 1, and performing secondary pressure reduction. When the external pressure of the second pressure airbag 904 disappears, the lifting piston 35 returns to its position under the action of the return spring 32, and at the same time, the lifting opening and closing valve core 31 moves downward to control the disconnection of the pressure-resistant main tank 26 and the steam pipe 1.

[0075] Specific working principle:

[0076] The entire pipeline transportation unit uses each steam pipe 1 as a small node unit. The safety emergency unit and the safety water collection unit set on each steam pipe 1 can cooperate to ensure the safety of the steam pipe 1. At the same time, only when each steam pipe 1 is safe can the safe transportation of the entire pipeline transportation unit be effectively guaranteed.

[0077] When the pressure inside the steam pipe 1 surges and is greater than the set value, the auxiliary pressure regulating and releasing mechanism works, and the pneumatic bypass linkage mechanism A thereon continuously receives high-temperature and high-pressure steam from the steam pipe 1. Then, the steam entering the pneumatic bypass linkage mechanism A will push the vertical valve stem 12 upward to overcome the resistance and pull it upward. After being pulled, the vertical valve stem 12 will drive the lifting valve ball 703 connected to its bottom to move upward and open the one-way lifting valve structure 7 in the blocked state. At this time, the high-pressure steam will pass through the one-way lifting valve structure 7 into the auxiliary pressure relief pipe 8, and then enter the first steel cylinder 901 connected thereto for storage, thereby realizing the first-level pressure relief. If the pressure inside the steam pipe 1 is still high after the first level of pressure reduction, the high-pressure steam will continue to enter the lower sealed chamber 19 through the steam booster intake pipe 22. When the pressure inside the lower sealed chamber 19 reaches the set value, the constant-pressure relief valve 24 on the steam overflow pipe 23 will open. Under the action of the constant-pressure relief valve 24 and the one-way relief reflux valve 25, the steam that will continue to enter the lower sealed chamber 19 will be directly diverted to the interior of the multi-way pressure relief valve body 3, so as to achieve the purpose of ensuring the stability of the maximum pressure inside the combined rigid sealed chamber 16 and ensure the safety of the combined rigid sealed chamber 16. The closed buffer assembly 9 receives steam from the steam pipe 1 by opening the one-way pull valve structure 7. The steam enters the first steel cylinder 901. As the steam increases, the internal pressure increases, thereby continuously compressing the first pressure airbag 903. When the first pressure airbag 903 is compressed, the pressure inside the second steel cylinder 902 connected thereto will continue to increase. When the internal pressure inside the second steel cylinder 902 increases, the second pressure airbag 904 will be continuously compressed. The inert gas inside the second pressure airbag 904 will cooperate with the pneumatic opening and closing valve B of the main control pressure regulating and pressure relief mechanism along the air guide steel pipe 906 and drive the pneumatic opening and closing valve B to open, thereby connecting the steam pipe 1 with the pressure-resistant main tank 26 to achieve secondary pressure relief and ensure rapid pressure relief.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. For those skilled in the art, any replacement, improvement or change made to the implementation mode of the present invention falls within the protection scope of the present invention.

[0079] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Special regulating valve system for steam pipeline, characterized by: It comprises a pipeline transport unit composed of a plurality of interconnected steam pipelines, wherein the inlet end of the pipeline transport unit is connected to the steam outlet of an upstream high-temperature boiler, and the outlet end is connected to a user end, and the steam pipelines are connected to each other through flanges, and the steam pipelines are fixedly arranged, and a safety emergency unit is installed on each steam pipeline, and a safety water collection unit is installed on the steam pipeline at the upstream position of each safety emergency unit, and the safety emergency unit is used to realize pressure reduction regulation of the steam pipeline in a pressure surge state, and the safety water collection unit cooperates with the steam pipeline to ensure the stability of the high-temperature steam in the state of transport; The safety emergency unit comprises a main pressure regulating and releasing mechanism and a sub-pressure regulating and releasing mechanism installed at intervals on the steam pipeline, wherein the main pressure regulating and releasing mechanism and the sub-pressure regulating and releasing mechanism are connected via a closed buffer component, and when the pressure inside the steam pipeline surges and exceeds a set maximum value, the closed buffer component controls the main pressure regulating and releasing mechanism and the sub-pressure regulating and releasing mechanism to coordinate movements to achieve safe pressure reduction inside the steam pipeline; The auxiliary control pressure regulating and releasing mechanism comprises a multi-way pressure releasing valve body installed on the steam pipeline, the valve cavity of the multi-way pressure releasing valve body is divided into an upper valve cavity and a lower valve cavity which are interconnected by a middle valve channel, the upper valve cavity is an air inlet end, the lower valve cavity is an air outlet end, a one-way lifting valve structure is connected to the bottom of the lower valve cavity, an auxiliary pressure releasing pipeline is installed at the bottom of the one-way lifting valve structure, the closed buffer assembly is connected to the bottom of the auxiliary pressure releasing pipeline, the closed buffer assembly is used to receive and store the high-temperature and high-pressure steam discharged from the multi-way pressure releasing valve body, and the end of the multi-way pressure releasing valve body is used to control the connection and disconnection of the main control pressure regulating and releasing mechanism with the inside of the current steam pipeline; The main control pressure regulating and releasing mechanism includes a pressure-resistant main tank, which is connected to the inside of the steam pipeline through a main pressure relief pipeline. A pneumatic opening and closing valve is installed on the main pressure relief pipeline. The pneumatic opening and closing valve is used to control the connection or disconnection between the pressure-resistant main tank and the steam pipeline.

2. The steam pipeline regulating valve system according to claim 1 is characterized in that: A valve core is installed in conjunction with the middle valve channel, and a plurality of steam flow channels are arranged on the valve core, the steam flow channels are connected to the upper valve cavity and the lower valve cavity, and a vertical valve stem is fixed on the top of the valve core, the top of the vertical valve stem moves upward and seals through the valve cover on the top of the multi-way pressure relief valve body and extends to the interior of the pneumatic bypass linkage mechanism, the air inlet end of the pneumatic bypass linkage mechanism is connected to the interior of the steam pipeline, and the air return end is connected back to the valve cavity of the multi-way pressure relief valve body, and the pneumatic bypass linkage mechanism drives the opening and closing of the one-way lift valve structure by controlling the lifting of the vertical valve stem.

3. The steam pipeline regulating valve system according to claim 2 is characterized in that: The auxiliary control pressure regulating and releasing mechanism is used to realize the primary pressure relief of the current steam pipeline. The main control pressure regulating and releasing mechanism is controlled by the auxiliary control pressure regulating and releasing mechanism and realizes the secondary pressure relief of the current steam pipeline. The primary pressure relief and the secondary pressure relief cooperate to realize the regulation of the internal pressure of the current steam pipeline. Each of the steam pipelines is equipped with a primary pressure relief and a secondary pressure relief and cooperates to realize the internal safety pressure reduction of the entire pipeline transportation unit.

4. The steam pipeline regulating valve system according to claim 3 is characterized in that: A stop valve is also installed on each of the steam pipelines.

5. The steam pipeline regulating valve system according to claim 4 is characterized in that: The pneumatic bypass linkage mechanism includes a mounting frame fixedly mounted on the top of the valve cover, a combined rigid sealing chamber fixedly mounted on the top of the mounting frame, a sealing disk cooperatedly mounted in the inner chamber of the combined rigid sealing chamber, the outer wall of the sealing disk sealingly abuts against the inner wall of the inner chamber of the combined rigid sealing chamber, the sealing disk seals and separates the inner chamber into an upper sealing chamber cavity and a lower sealing chamber cavity, a primary buffer spring is fixedly mounted in the lower sealing chamber cavity, a plurality of secondary buffer springs are arranged at intervals along the circumference of the top of the primary buffer spring, and the tops of the secondary buffer springs are fixedly mounted on the The bottom of the sealing disk, the top of the vertical valve stem is movable and sealed to extend into the lower sealing chamber and is fixedly connected to the bottom of the sealing disk, and a steam booster intake pipe is connected to the right side of the lower sealing chamber and extends into the interior thereof in a sealed manner, and the inlet end of the steam booster intake pipe is connected to the interior of the steam pipe, and a steam overflow pipe is sealed and connected to the left side of the lower sealing chamber, and the end of the steam overflow pipe is connected to the interior of the multi-way pressure relief valve body, and the steam overflow pipe is a unidirectional conducting pipeline, and a constant pressure overflow valve and a one-way overflow reflux valve are installed on the steam overflow pipe in sequence from top to bottom.

6. The steam pipeline regulating valve system according to claim 5, characterized in that: The one-way lifting valve structure includes a straight valve tube which is sealed and fixedly connected to the bottom of the lower valve cavity of the multi-way pressure relief valve body, an annular channel disk is fixedly installed inside the straight valve tube, a lifting valve ball is sealed and tightly pressed against the top of the annular channel disk, the top of the lifting valve ball is fixedly connected to a lifting needle column extending into the straight valve tube, the top of the lifting needle column is fixed to the bottom of the vertical valve stem, a lifting and releasing spring is installed inside the straight valve tube above the lifting valve ball, the top of the lifting and releasing spring is pressed against the bottom of the multi-way pressure relief valve body, and the bottom of the straight valve tube is sealed and fixedly connected to the air inlet end of the closed buffer assembly.

7. The steam pipeline regulating valve system according to claim 6, characterized in that: A discharge valve is provided at the bottom outlet of the pressure-resistant main tank.

8. The steam pipeline regulating valve system according to claim 7, characterized in that: The closed buffer assembly includes a first steel cylinder and a second steel cylinder which are closed and arranged. The top of the first steel cylinder is connected with the auxiliary pressure relief pipe. The first steel cylinder and the second steel cylinder are respectively provided with a first pressure airbag and a second pressure airbag. The first pressure airbag and the second pressure airbag are both filled with an appropriate amount of inert gas. The first pressure airbag is connected with the interior of the second steel cylinder through a connecting steel pipe. The second pressure airbag is connected with the pneumatic opening and closing valve of the main pressure regulating and pressure relief mechanism through an air-conducting steel pipe and is used to control the connection and disconnection of the main pressure regulating and pressure relief mechanism and the steam pipeline. The inner cavity of the first steel cylinder is used to temporarily store steam from the steam pipeline and realize the first-level pressure reduction of the steam pipeline. A discharge joint with a sealing plug is sealed and connected to the bottom of the first steel cylinder. The water vapor accumulated inside the inner cavity of the first steel cylinder is discharged by regularly opening the discharge joint.

9. The steam pipeline regulating valve system according to claim 8, characterized in that: The safety water collection unit includes a water collection arc elbow connected to the corresponding steam pipe water inlet end, both ends of the water collection arc elbow are connected to the interior of the steam pipe, and a drain joint with a plug is installed at the bottom of the water collection arc elbow. The water collection arc elbow is used to receive condensed water accumulated inside the steam pipe and to reduce the probability of water hammer. The condensed water accumulated inside the water collection arc elbow is discharged by regularly opening the drain joint.

Images