A new low pressure bypass regulating valve

Abstract

The present application relates to the technical field of regulating valve, specifically to a new low-pressure bypass regulating valve, comprising: a pressure and temperature reducing part arranged in a valve body, the pressure and temperature reducing part comprises a labyrinth disc and a dredging part, the labyrinth disc is embedded in the valve body for reducing the pressure of fluid flowing into the valve body, the dredging part is rotatably sleeved outside the labyrinth disc for adjusting the flow rate of fluid flowing through the labyrinth disc; a motion sealing part arranged in the valve body for controlling the on-off and flow rate of fluid in the valve body. The present application has the active anti-clogging function, high reliability in low flow condition, long service life of valve, and significantly reduces the frequency and cost of unplanned shutdown maintenance.

Description

Technical Field

[0001] This invention relates to the field of control valves, and more particularly to a novel low-pressure bypass control valve. Background Technology

[0002] The low-pressure bypass regulating valve is one of the core components of the low-pressure bypass system in a thermal power unit. In the turbine bypass system, the high-pressure bypass system vents steam from the boiler superheater to the reheater, while the low-pressure bypass system vents steam from the reheater to the condenser. The low-pressure bypass regulating valve is installed on the pipeline of the low-pressure bypass system to control the steam flow and achieve pressure reduction and desuperheating functions. The low-pressure bypass system plays a crucial role in protecting the reheater and turbine during unit startup, load shedding, or emergency conditions. By bypassing reheated steam to the condenser, it prevents the boiler reheater from dry-burning and ensures the safe and stable operation of the unit. Therefore, the performance of the low-pressure bypass regulating valve directly affects the safety and reliability of the entire thermal power unit.

[0003] In existing technologies, conventional low-pressure bypass control valves mainly consist of components such as a valve body, valve cover, valve stem, valve core, and valve seat, realizing the basic functions of fluid on / off and flow regulation. Due to the large pressure differential and high flow velocity of the conveyed medium, existing valves face the following prominent problems when performing throttling regulation: First, there are severe problems with cavitation cavitation, erosion, and wear. When high-temperature, high-pressure steam flows through traditional single-seat or cage-type throttling devices, the pressure energy is severely dissipated in localized areas due to the limited number of pressure reduction stages and flow channel structure, easily inducing flashing and cavitation phenomena. The microjets and shock waves generated during cavitation cause continuous erosion damage to the valve core, valve seat sealing surfaces, and the inner wall of the valve body, leading to rapid failure of the sealing pairs, deterioration of valve control performance, significantly shortening the valve's service life, and increasing the frequency and cost of unplanned downtime maintenance.

[0004] Secondly, the problem of clogging in the throttling channel under prolonged low-flow conditions is difficult to solve. When the valve operates at a small opening or low flow rate for an extended period, the flow velocity within the channel decreases significantly. This makes it easy for impurities, oxide scale, and other debris carried by the high-temperature steam to deposit and scale in the narrow throttling channel, gradually clogging it. As the clogging worsens, the effective flow area of ​​the valve decreases, the flow regulation characteristics become distorted, and it may even completely lose its regulating function. Current technologies typically lack effective means to actively suppress clogging of throttling elements under low-flow conditions, often requiring maintenance measures such as disassembly, cleaning, or replacement. This not only incurs high maintenance costs but also affects the reliability of continuous system operation.

[0005] Furthermore, traditional control valves typically employ only a single moving seal (single valve core structure) to perform all shut-off and regulation functions. When this seal and its seat wear and fail under harsh operating conditions, the entire valve must be shut down for maintenance, forcing the entire system to shut down. This results in low efficiency and fails to meet the requirements for long-term stable operation of high-reliability systems. While a few valves employ a dual valve core structure, their drive, sealing, and coordinated control designs are complex, and reliable switching and precise control when the two valve cores are used alternately are difficult to achieve effectively.

[0006] In summary, existing low-pressure bypass control valves generally suffer from a series of technical challenges when dealing with high-temperature, high-pressure, and large-differential-pressure media, including insufficient throttling and pressure reduction effects, susceptibility to clogging at low flow rates, short seal lifespan, and high maintenance frequency and costs. Therefore, there is an urgent need to innovate and optimize the pressure reduction and cooling structure, anti-clogging mechanism, and motion seal coordination control of low-pressure bypass control valves, and to develop a new type of low-pressure bypass control valve that can effectively suppress cavitation and vibration, prevent throttling channel blockage, extend service life, and reduce operation and maintenance frequency and costs. Summary of the Invention

[0007] To address the technical problems existing in the prior art, this invention provides a novel low-pressure bypass regulating valve. The technical solution is as follows: A novel low-pressure bypass regulating valve includes: A pressure-reducing and temperature-reducing component is disposed within the valve body. The pressure-reducing and temperature-reducing component includes a labyrinth disc and a draining component. The labyrinth disc is embedded in the valve body and is used to reduce the pressure of the fluid flowing into the valve body. The draining component is rotatably sleeved outside the labyrinth disc and is used to regulate the flow rate of the fluid flowing through the labyrinth disc. A moving seal, which is disposed within the valve body, is used to control the flow and interruption of fluid within the valve body.

[0008] Preferably, the unblocking component includes an unblocking sleeve, an unblocking transmission component, and an unblocking power component. The unblocking sleeve is rotatably sleeved outside the labyrinth disc. The unblocking transmission component is on the labyrinth disc and transmits the driving force of the unblocking power component, which is connected in a transmission, to the unblocking sleeve, thereby causing the unblocking sleeve to rotate intermittently on the labyrinth disc to selectively increase the fluid flow velocity in a certain row of the multiple throttling channels on the labyrinth disc.

[0009] Preferably, the first through hole provided on the side wall of the unblocking sleeve has a width greater than the inlet width of the throttling channel and a length greater than the inlet length of a row of throttling channels; the plurality of first through holes are evenly distributed along the circumference of the unblocking sleeve, so that the plurality of first through holes can be connected to the inlets of the plurality of rows of throttling channels one by one.

[0010] Preferably, the sidewall between two adjacent first through holes is a sealing wall, the width of which is not less than the width of the first through hole. Multiple sealing walls can block the inlets of multiple rows of throttling channels one by one. When a sealing wall is cut off, it forms a selective through hole. After the remaining multiple sealing walls block the inlets of the corresponding throttling channels, the selective through hole can connect with the inlets of a certain row of throttling channels to increase the fluid velocity in that row of throttling channels.

[0011] Preferably, the unblocking transmission component includes a first gear ring, a transmission relay, a second gear ring, and a transmission tube. The first gear ring is embedded in the inner wall of the top end of the unblocking sleeve and meshes with the transmission relay. The transmission relay is rotatably mounted on the labyrinth disc. The second gear ring meshes with the transmission relay within the labyrinth disc, so that the second gear ring is connected to the first gear ring via the transmission relay. One end of the transmission tube is connected to the top end of the second gear ring and is driven by the unblocking power component.

[0012] Preferably, the transmission relay includes a transmission shaft, a first gear, and a second gear. One end of the transmission shaft rotatably passes through the mounting base of the labyrinth disc. The first gear is mounted on one end of the transmission shaft and meshes with the first gear ring. The second gear is mounted on the other end of the transmission shaft and meshes with the second gear ring.

[0013] Preferably, the unblocking power component includes a permanent magnet and an electromagnetic component. The permanent magnet is disposed on the transmission pipe, and the electromagnetic component is disposed on the valve cover of the valve body. The permanent magnet is driven by electromagnetic force to drive the transmission pipe to rotate intermittently in a circumferential direction.

[0014] Preferably, the moving seal includes a first moving seal and a second moving seal. The first moving seal controls the opening and closing of the first flow channel and the flow rate within the valve body, and the second moving seal controls the opening and closing of the second flow channel and the flow rate within the valve body. The first moving seal and the second moving seal alternately or simultaneously control the opening and closing of the fluid and the flow rate within the valve body as needed.

[0015] Preferably, the first moving seal includes a first valve stem, a first valve core, a first sealing cap, a first packing, a second sealing cap, and an actuator. One end of the first valve stem is inserted into the first cavity of the valve body. The first valve core is on one end of the first valve stem and cooperates with the valve seat on the first flow channel to control the flow and flow rate of the fluid. The first sealing cap is installed on the valve cover and is sleeved over the first valve stem. The first packing is installed in the packing groove inside the first sealing cap. The second sealing cap is installed on the first sealing cap. The actuator is on the second sealing cap and is drivenly connected to the first valve stem.

[0016] Preferably, the second moving seal includes a second valve stem, a second valve core, a second packing, a threaded tube, a screw, a third sealing cap, a guide rod, and a motor. One end of the second valve stem rotates through the second through hole of the first valve core and then penetrates into the third through hole of the first valve stem. The second valve core is on the other end of the second valve stem and cooperates with the valve seat on the second flow channel to control the flow and flow rate of the fluid. The second packing is filled in the bottom of the first enlarged hole in the top hole of the third through hole. The threaded tube is embedded in the second enlarged hole in the inner wall of the first enlarged hole and presses the second packing into the first enlarged hole. One end of the screw is screwed into the threaded tube, and one end face of the screw is rotatably connected to one end face of the second valve stem. The third sealing cap is installed on the other end of the first valve stem. The guide rod is disposed on the third sealing cap. The motor is slidably mounted on the guide rod through the mounting hole thereon.

[0017] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: (1) The novel low-pressure bypass regulating valve of the present invention has an active anti-clogging function, high reliability in low flow conditions, long service life, and significantly reduces the frequency and cost of unplanned downtime maintenance. (2) The novel low-pressure bypass regulating valve of the present invention addresses the problem of blockage of throttling channels during long-term low-flow operation of the valve by innovatively setting up a unblocking component consisting of an unblocking sleeve, an unblocking transmission component, and an unblocking power component. The unblocking sleeve is mounted on the outside of the labyrinth disc and drives the transmission relay component and the gear ring pair through an electromagnetically driven permanent magnet, so that the unblocking sleeve rotates intermittently on the labyrinth disc. When the flow rate is low, the unblocking sleeve blocks most of the throttling channel inlets through the sealing wall, and only the selected through hole is connected to a certain row of throttling channels, which greatly increases the fluid velocity in this row of channels and achieves strong flushing of deposited impurities. At the same time, the unblocking sleeve rotates intermittently, so that the selected through hole is connected to each row of throttling channels periodically, which effectively prevents impurities from being retained and deposited in any channel for a long time. This active anti-blocking design can ensure that the regulating valve remains unobstructed under long-term low-flow conditions, avoid the distortion of regulating characteristics caused by blockage, and significantly improve the reliability of continuous system operation. (3) The novel low-pressure bypass regulating valve of the present invention differs from the traditional single valve core structure by setting a first moving seal and a second moving seal; the two control the opening and closing of the first flow channel and the flow rate of the second flow channel respectively, and can work alternately according to the working conditions or participate in regulation at the same time; by controlling the distance between the first valve core and the second valve core, the valve core in the non-working state can be moved away from the corresponding valve seat and be in a standby protection state without erosion, cavitation and wear; when the sealing surface of one working valve core is worn, the other standby valve core can be switched to continue to perform precise regulation function without immediate shutdown for maintenance, thereby multiplying the overall effective use efficiency of the valve and minimizing the risk of system shutdown due to regulating valve failure. Attached Figure Description

[0018] Figure 1 This is the front view of the present invention; Figure 2 This is the left-side front view of the present invention; Figure 3 For the present invention Figure 1 A magnified view of part A in the image; Figure 4 This is a three-dimensional structural diagram of the present invention; Figure 5 For the present invention Figure 4 A magnified view of part C; Figure 6 For the present invention Figure 2 Front view of the cross section in the middle BB direction; Figure 7 For the present invention Figure 6 A magnified view of part D; Figure 8 For the present invention Figure 6 A magnified view of part E in the image; Figure 9 For the present invention Figure 2 Schematic diagram of the three-dimensional structure in the BB direction; Figure 10 For the present invention Figure 9 A magnified view of part of F; Figure 11 For the present invention Figure 9 A magnified view of a portion of G; Figure 12 This is a three-dimensional structural diagram of the maze disc in this invention; Figure 13 This is a three-dimensional structural diagram of the maze disc in this invention, viewed from below. Figure 14 This is a three-dimensional structural diagram of the unblocking sleeve in this invention; Figure 15 This is a bottom-view three-dimensional structural diagram of the unblocking sleeve in this invention; Figure 16 This is a three-dimensional structural diagram of the unblocking sleeve rotating on the labyrinth disc in this invention; Figure 17 This is a bottom-view three-dimensional structural diagram of the unblocking sleeve rotating on the labyrinth disc in this invention; Figure 18 This is a physical image of the product of this invention.

[0019] In the diagram: 1-Valve body, 2-Valve cover, 3-Outlet pipe, 4-First cavity, 5-Inlet pipe, 6-Desuperheating branch pipe, 7-Desuperheating main pipe, 8-Second cavity, 9-Heat sink, 10-First mounting base, 11-Maze plate, 12-Second mounting base, 13-Inlet of throttling channel, 14-Outlet of throttling channel, 15-Unblocking sleeve, 16-First through hole, 17-Sealing wall, 18-Selective through hole, 19-First gear ring, 20-Second gear ring, 21-Transmission pipe, 22 - Drive shaft, 23- First gear, 24- Second gear, 25- Permanent magnet, 26- Electromagnetic component, 27- First valve stem, 28- First valve core, 29- First sealing cover, 30- First packing, 31- Second sealing cover, 32- Actuator, 33- Valve seat on the first flow channel, 34- Second valve stem, 35- Second valve core, 36- Second packing, 37- Threaded pipe, 38- Screw, 39- Third sealing cover, 40- Guide rod, 41- Motor, 42- Valve seat on the second flow channel. Detailed Implementation

[0020] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0021] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0022] In the embodiments of this invention, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning. Similarly, the terms "of," "corresponding (relevant)," and "corresponding" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning.

[0023] In this embodiment of the invention, sometimes a subscript such as W1 may be written in a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.

[0024] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0025] according to Figures 1-17 As shown, a novel low-pressure bypass regulating valve includes a valve body, a pressure-reducing and cooling component, and a moving seal. The pressure-reducing and cooling component is located within the valve body and reduces the pressure and temperature of the fluid flowing through the valve body, controls the flow rate, reduces cavitation, severe vibration, and high-decibel noise, protects the valve body and the moving seal, and extends their service life. The moving seal is located within the valve body and controls the flow and interruption of the fluid within the valve body.

[0026] The valve body includes a valve body 1, a valve cover 2, and an outlet pipe 3. The valve body 1 is used to install the pressure-reducing and cooling component and the moving seal. The valve cover 2 seals and covers the upper port of the first cavity 4 of the valve body 1. The first cavity 4 is connected to one end of the inlet pipe 5. The inlet pipe 5 is used to deliver fluid into the first cavity 4. The outlet pipe 3 is connected to the valve body 1 and is used to discharge the pressure-reduced and cooled fluid.

[0027] Furthermore, a desuperheater is installed on the outlet pipe 3. The desuperheater includes a desuperheating branch pipe 6 and a desuperheating main pipe 7. One end of the desuperheating branch pipe 6 is disposed through the side wall of the outlet pipe 3, and a nozzle is disposed through one end of the desuperheating branch pipe 6 for spraying atomized cooling water into the outlet pipe 3 to reduce the fluid temperature. Two desuperheating branch pipes 6 are provided, and the two desuperheating branch pipes are symmetrically distributed on the pipe wall of the outlet pipe 3 to improve the desuperheating efficiency. The two ends of the desuperheating main pipe 7 are respectively connected to the other ends of the two desuperheating branch pipes 6, and the connection port on the desuperheating main pipe 7 is connected to a cooling water pump for supplying coolant to the nozzle.

[0028] Furthermore, a second cavity 8 is provided inside the valve body 1. The second cavity 8 communicates with the first cavity 4 through a first flow channel, and the second cavity 8 communicates with the outlet pipe 3 through a second flow channel. The flange at the bottom of the valve cover 2 is bolted to the first cavity 4. Alternatively, a heat sink 9 is provided on the outer wall of the valve cover 2 to improve heat dissipation performance and reduce the temperature at the top of the valve cover 2.

[0029] The pressure-reducing and cooling component includes a labyrinth disc and a draining component. The labyrinth disc is embedded in the valve body 1 and is used to reduce the pressure of the fluid flowing into the valve body 1 through the inlet pipe 5. The draining component is rotatably sleeved on the outside of the labyrinth disc and is used to adjust the flow rate of the fluid through the labyrinth disc when the regulating valve is at a low flow rate for a long time, so as to prevent impurities in the fluid from clogging the labyrinth disc.

[0030] The labyrinth disc includes a first mounting base 10, labyrinth stack 11, and a second mounting base 12. The first mounting base 10 and the second mounting base 12 tightly stack multiple labyrinth stacks 11 together along the axial direction, and reduce the pressure and temperature of the fluid through the throttling channels on the labyrinth stacks 11.

[0031] The first mounting base 10 is generally thick-walled and annular, used for a sealed and continuous connection with the first flow channel. The labyrinth plate 11 is generally annular and plate-shaped, with grooves precisely machined on it. These grooves guide the fluid and gradually reduce its pressure along a predetermined path. Alternatively, each labyrinth plate 11 may have multiple sets of grooves, which are evenly distributed circumferentially on the labyrinth plate 11. Multiple labyrinth plates 11 are tightly pressed together axially between the first mounting base 10 and the second mounting base 12, such that the grooves on the multiple labyrinth plates 11 form a throttling channel for the fluid. The inlets 13 of the multiple throttling channels formed by the labyrinth plates are arranged axially on the outer wall of the labyrinth plates, and eight rows of axially arranged throttling channel inlets are provided on the labyrinth plates, with the eight rows of throttling channel inlets 13 evenly spaced circumferentially. The outlets 14 of the multiple throttling channels formed by the labyrinth disc are arranged axially on the inner sidewall of the labyrinth disc, and eight rows of throttling channel outlets arranged axially on the labyrinth disc are provided, with the eight rows of throttling channel outlets 14 evenly spaced circumferentially. The labyrinth disc 11 can be manufactured using existing technology. The eight rows of grooves and eight rows of throttling channels described in this patent are only intended to clarify the subsequent technical features and do not constitute a specific technical limitation.

[0032] The second mounting base 12 is generally in the shape of a thick-walled circular tube. A transmission groove is provided on the outer side wall of the top of the second mounting base 12. The bottom of the second mounting base 12 is tightly fitted with the labyrinth plate 11, and the top of the second mounting base 12 is sealed and fitted with the valve cover 2.

[0033] The unblocking component includes an unblocking sleeve 15, an unblocking transmission component, and an unblocking power component. The unblocking sleeve 15 is rotatably sleeved on the outside of the labyrinth disc. The unblocking transmission component is on the labyrinth disc and transmits the driving force of the connected unblocking power component to the unblocking sleeve 15, so as to drive the unblocking sleeve 15 to rotate intermittently on the labyrinth disc. This allows for selectively increasing the fluid velocity of a certain column of the throttling channels during prolonged low flow (while disconnecting the throttling channels in the remaining groups), preventing impurities in the fluid from accumulating and clogging the throttling channels.

[0034] The unblocking sleeve 15 is generally cylindrical, with a length less than that of the labyrinth disc, and an inner wall radius not less than that of the labyrinth disc. A first through hole 16 is provided on the side wall of the unblocking sleeve 15. The first through hole 16 is elongated, with a width greater than the width of the inlet 13 of the throttling channel, and a length greater than the sum of the lengths of the inlets 13 of a row of throttling channels (optionally, the length of the first through hole 16 is greater than the total axial length of the labyrinth discs 11 after stacking). Eight first through holes 16 are provided, evenly distributed circumferentially along the unblocking sleeve 15, so that each of the eight first through holes 16 corresponds to one of the inlets 13 of the eight rows of throttling channels, allowing fluid to enter the inlets 13 of the throttling channels through the first through holes 16.

[0035] The sidewall between two adjacent first through holes 16 is a sealing wall 17. The width of the sealing wall 17 is not less than the width of the first through hole 16. When the unblocking sleeve 15 rotates circumferentially by a predetermined angle, the eight sealing walls 17 can block the inlets 13 of the eight columns of throttling channels one by one. Furthermore, one sealing wall 17 is removed to form a selective through hole 18. After the remaining seven sealing walls block the corresponding inlets 13 of the throttling channels, the selective through hole 18 can connect with the inlets 13 of a certain column of throttling channels. The flow velocity of the unblocked throttling channels in this column will significantly increase, preventing impurities in the fluid from clogging the throttling channels. Alternatively, the specific number of sealing walls 17 removed can be determined based on the minimum flow rate.

[0036] The unblocking transmission component includes a first gear ring 19, a transmission relay, a second gear ring 20, and a transmission tube 21. The first gear ring 19 is fixedly embedded in the inner wall of the top end of the unblocking sleeve 15 and meshes with the transmission relay. The transmission relay is rotatably disposed on the labyrinth disc. The second gear ring 20 is meshed with the transmission relay within the labyrinth disc, so that the second gear ring 20 is connected to the first gear ring 19 through the transmission relay. One end of the transmission tube 21 is fixedly connected to the top end of the second gear ring 20.

[0037] Furthermore, the bottom surface of the first gear ring 19 is inclined, and a first gear tooth is provided on the bottom surface of the first gear ring 19, which meshes with the first gear 23. The bottom surface of the second gear ring 20 is inclined, and a second gear tooth is provided on the bottom surface of the second gear ring 20, which meshes with the second gear 24. When the transmission pipe 21 is circumferentially driven by the unblocking power component, the first gear 23 will be driven to rotate through the second gear 24 and the transmission relay component, and the first gear 23 will drive the unblocking sleeve 15 to rotate intermittently circumferentially. When the regulating valve is at a low flow rate for a long time, the selected through hole 18 and the eight rows of throttling channels are intermittently connected one by one (each row is connected for a predetermined time) to prevent blockage.

[0038] The transmission relay includes a transmission shaft 22, a first gear 23, and a second gear 24. One end of the transmission shaft 22 rotatably passes through the second mounting base 12. The first gear 23 is fixedly mounted on one end of the transmission shaft 22 and meshes with the first gear ring 19. The second gear 24 is fixedly mounted on the other end of the transmission shaft 22 and meshes with the second gear ring 20.

[0039] Furthermore, both the first gear 23 and the second gear 24 are bevel gears, with the first gear 23 meshing with the first gear teeth and the second gear 24 meshing with the second gear teeth. Alternatively, four sets of the transmission relay are provided, and the four sets of transmission relays are evenly distributed circumferentially.

[0040] The unblocking power component includes a permanent magnet 25 and an electromagnetic component 26. The permanent magnet 25 is fixedly mounted on the transmission pipe 21, and the electromagnetic component 26 is fixedly mounted outside the valve cover 2. The permanent magnet 25 is driven by electromagnetic force to drive the transmission pipe 21 to rotate intermittently in a circumferential direction.

[0041] Sixteen permanent magnets 25 are provided, and the sixteen permanent magnets 25 are evenly fixed along the circumference on the outer wall of the other end of the transmission tube 21. Alternatively, the permanent magnets 25 are high-temperature resistant permanent magnets such as AlNiCo, Samarium Cobalt, or ferrite. The magnetic poles of adjacent permanent magnets 25 are in opposite directions.

[0042] The electromagnetic component 26 includes a protective shell, an iron core, and a coil. The protective shell is fixedly mounted on the outer wall of the upper end of the valve cover 2, the iron core is fixedly mounted inside the protective shell, and the coil is wound around the iron core. This allows the electromagnetic field generated by the electromagnetic component 26 to be directed towards one end (the circumferential end) of the permanent magnet 25, thereby driving the permanent magnet 25 to rotate the transmission tube 21 circumferentially by a predetermined angle (after each 22.5-degree circumferential rotation, the circumferential lock is maintained for a predetermined time). One or more sets of the electromagnetic component 26 are provided. Alternatively, sixteen sets of the electromagnetic component 26 are provided, evenly distributed circumferentially and fixedly mounted on the outer wall of the upper end of the valve cover 2, with each set corresponding to one of the sixteen permanent magnets 25.

[0043] It should be noted that when one set of the electromagnetic components 26 is installed, the direction of the electromagnetic poles changes once for each predetermined angle rotation of the transmission tube 21. When multiple sets of the electromagnetic components 26 are installed, the direction of the magnetic poles of adjacent electromagnetic components changes once for each predetermined angle rotation of the transmission tube 21, and the directions of the magnetic poles of adjacent electromagnetic components are always opposite. The housing of the low-pressure bypass regulating valve is not made of carbon steel; 304 and 316 stainless steel are very common and mainstream materials for manufacturing the housing (valve body) of the low-pressure bypass regulating valve.

[0044] The motion seal includes a first motion seal and a second motion seal. The first motion seal controls the opening and closing of the first flow channel and the flow rate within the valve body. The second motion seal controls the opening and closing of the second flow channel and the flow rate within the valve body. The first motion seal and the second motion seal can be controlled alternately or simultaneously as needed.

[0045] The first moving seal includes a first valve stem 27, a first valve core 28, a first sealing cover 29, a first packing 30, a second sealing cover 31, and an actuator 32. One end of the first valve stem 27 is inserted into the first cavity 4. The first valve core 28 is disposed on one end of the first valve stem 27. The first valve core 28 cooperates with the valve seat 33 on the first flow channel to control the flow and flow rate of the fluid. The flange at the bottom of the first sealing cover 29 is detachably and sealingly installed on the flange at the top of the valve cover 2, and the first sealing cover 29 is sleeved over the first valve stem 27. The first packing 30 is installed in the packing groove on the inner wall of the top of the first sealing cover 29, so that the first valve stem 27 and the first sealing cover 29 are axially slidingly sealed. The bottom flange of the second sealing cover 31 is detachably sealed on the top flange of the first sealing cover 29, pressing the first packing 30 into the packing groove. The actuator 32 is on the second sealing cover 31 and is drivenly connected to the first valve stem 27 to drive the first valve stem 27 to slide up and down, thereby driving the first valve core 28 to move up and down to control the flow and flow rate of the fluid.

[0046] The second moving seal includes a second valve stem 34, a second valve core 35, a second packing 36, a threaded tube 37, a screw 38, a third sealing cap 39, a guide rod 40, and a motor 41. One end of the second valve stem 34 rotates through a second through hole at the axis of the first valve core 28 and then rotates into a third through hole at the axis of the first valve stem 27. The second valve core 35 is fixedly mounted on the other end of the second valve stem 34. The second valve core 35 cooperates with the valve seat 42 on the second flow channel to control fluid flow and flow rate. The second packing 36 is filled into the bottom of a first enlarged hole within the top hole of the third through hole, enabling an axial sliding sealing transmission connection between the second valve stem 34 and the third through hole. The threaded tube 37 is embedded in the first enlarged hole. The second enlarged hole on the inner wall (the radius of the second enlarged hole is not less than the radius of the first enlarged hole, the depth of the second enlarged hole is less than the depth of the first enlarged hole, and the first enlarged hole below the second enlarged hole forms a packing groove) is used to stably press the second packing 36 into the first enlarged hole. One end of the screw 38 is screwed into the threaded tube 37, and one end face of the screw 38 is rotatably connected to one end face of the second valve stem 34. The flange on the third sealing cover 39 is detachably installed on the flange on the other end of the first valve stem 27. One end of the guide rod 40 is vertically set on the third sealing cover 39, and the four guide rods 40 are evenly distributed circumferentially on the third sealing cover 39. The motor 41 is slidably fitted onto the guide rod 40 through the mounting holes on it. There are four mounting holes, and the four mounting holes are axially slidably fitted onto the four guide rods 40 one by one, so that the motor 41 can slide axially and be circumferentially locked on the guide rods 40.

[0047] When the motor 41 drives the screw 38 to rotate, it will drive the second valve core 35 to move up and down through the second valve stem 34. The moving second valve core 35 cooperates with the second valve seat on the second flow channel to control the fluid flow and flow rate. Alternatively, the external thread of the threaded tube 37 can be screwed into the internal thread of the second enlarged hole to axially press the second packing 36 into the first enlarged hole.

[0048] It should be noted that by controlling the distance between the second valve core 35 and the first valve core 28, the fluid flow and on / off state can be controlled sequentially using either the first valve core 28 or the second valve core 35. When not in use, the first valve core 28 or the second valve core 35 is far from its corresponding valve seat, remaining in a standby state free from erosion, cavitation, and wear. This significantly improves the effective utilization efficiency of the regulating valve and reduces the impact of system downtime caused by regulating valve maintenance.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A novel low-pressure bypass regulating valve, characterized in that, include: A pressure-reducing and temperature-reducing component is disposed within the valve body. The pressure-reducing and temperature-reducing component includes a labyrinth disc and a draining component. The labyrinth disc is embedded in the valve body and is used to reduce the pressure of the fluid flowing into the valve body. The draining component is rotatably sleeved outside the labyrinth disc and is used to regulate the flow rate of the fluid flowing through the labyrinth disc. A moving seal, which is disposed within the valve body, is used to control the flow and interruption of fluid within the valve body.

2. The novel low-pressure bypass regulating valve according to claim 1, characterized in that, The unblocking component includes an unblocking sleeve, an unblocking transmission component, and an unblocking power component. The unblocking sleeve is rotatably sleeved on the outside of the labyrinth disc. The unblocking transmission component is on the labyrinth disc and transmits the driving force of the unblocking power component, which is connected in a transmission, to the unblocking sleeve, thereby causing the unblocking sleeve to rotate intermittently on the labyrinth disc to selectively increase the fluid flow velocity in a certain row of the multiple throttling channels on the labyrinth disc.

3. The novel low-pressure bypass regulating valve according to claim 2, characterized in that, The first through hole provided on the side wall of the unblocking sleeve has a width greater than the inlet width of the throttling channel and a length greater than the inlet length of a row of throttling channels; multiple first through holes are evenly distributed around the circumference of the unblocking sleeve, so that multiple first through holes can be connected to the inlets of multiple rows of throttling channels one by one.

4. The novel low-pressure bypass regulating valve according to claim 3, characterized in that, The sidewall between two adjacent first through holes is a sealing wall, the width of which is not less than the width of the first through hole. Multiple sealing walls can block the inlets of multiple rows of throttling channels one by one. When a sealing wall is cut off, it forms a selective through hole. After the remaining multiple sealing walls block the inlets of the corresponding throttling channels, the selective through hole can connect with the inlets of a certain row of throttling channels to increase the fluid velocity in that row of throttling channels.

5. The novel low-pressure bypass regulating valve according to any one of claims 2-4, characterized in that, The unblocking transmission component includes a first gear ring, a transmission relay, a second gear ring, and a transmission tube. The first gear ring is embedded in the inner wall of the top of the unblocking sleeve and meshes with the transmission relay. The transmission relay is rotatably mounted on the labyrinth disc. The second gear ring meshes with the transmission relay within the labyrinth disc, so that the second gear ring is connected to the first gear ring via the transmission relay. One end of the transmission tube is connected to the top of the second gear ring and is driven by the unblocking power component.

6. The novel low-pressure bypass regulating valve according to claim 5, characterized in that, The transmission relay includes a transmission shaft, a first gear, and a second gear. One end of the transmission shaft rotatably passes through the mounting base of the labyrinth disc. The first gear is mounted on one end of the transmission shaft and meshes with the first gear ring. The second gear is mounted on the other end of the transmission shaft and meshes with the second gear ring.

7. The novel low-pressure bypass regulating valve according to claim 5, characterized in that, The unblocking power component includes a permanent magnet and an electromagnetic component. The permanent magnet is mounted on the transmission pipe, and the electromagnetic component is mounted on the valve cover of the valve body. The permanent magnet is driven by electromagnetic force to drive the transmission pipe to rotate intermittently in a circumferential direction.

8. The novel low-pressure bypass regulating valve according to any one of claims 1-4, characterized in that, The moving seal includes a first moving seal and a second moving seal. The first moving seal controls the opening and closing of a first flow channel and the flow rate within the valve body. The second moving seal controls the opening and closing of a second flow channel and the flow rate within the valve body. The first moving seal and the second moving seal can control the opening and closing of the fluid and the flow rate within the valve body alternately or simultaneously as needed.

9. The novel low-pressure bypass regulating valve according to claim 8, characterized in that, The first moving seal includes a first valve stem, a first valve core, a first sealing cap, a first packing, a second sealing cap, and an actuator. One end of the first valve stem is inserted into the first cavity of the valve body. The first valve core is on one end of the first valve stem and cooperates with the valve seat on the first flow channel to control the flow and flow rate of the fluid. The first sealing cap is installed on the valve cover and is sleeved over the first valve stem. The first packing is installed in the packing groove inside the first sealing cap. The second sealing cap is installed on the first sealing cap. The actuator is on the second sealing cap and is drivenly connected to the first valve stem.

10. The novel low-pressure bypass regulating valve according to claim 9, characterized in that, The second moving seal includes a second valve stem, a second valve core, a second packing, a threaded tube, a screw, a third sealing cap, a guide rod, and a motor. One end of the second valve stem rotates through the second through hole of the first valve core and then penetrates into the third through hole of the first valve stem. The second valve core is on the other end of the second valve stem and cooperates with the valve seat on the second flow channel to control the flow and flow rate of fluid. The second packing is filled in the bottom of the first enlarged hole in the top hole of the third through hole. The threaded tube is embedded in the second enlarged hole in the inner wall of the first enlarged hole and presses the second packing into the first enlarged hole. One end of the screw is screwed into the threaded tube, and one end face of the screw is rotatably connected to one end face of the second valve stem. The third sealing cap is installed on the other end of the first valve stem. The guide rod is disposed on the third sealing cap. The motor is slidably mounted on the guide rod through the mounting hole thereon.

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