Anti-cavitation and anti-abrasion maze regulating valve and anti-cavitation and anti-abrasion maze regulating method

Abstract

The invention discloses an anti-cavitation and anti-abrasion labyrinth regulating valve and an anti-cavitation and anti-abrasion labyrinth regulating method. A valve element assembly and a sleeve assembly are arranged in the valve body assembly, and an inlet and an outlet are formed in the valve body assembly. The sleeve assembly is arranged in a valve cavity of the valve body assembly, and the valve element assembly is coaxially and movably arranged in the sleeve assembly in a sleeved mode and can move up and down. The sleeve assembly is provided with a flow channel structure for reducing pressure of high-pressure fluid, the valve element assembly is internally provided with two valve elements wrapped with each other and an elastic structure between the two valve elements, and opening control and protection are driven through the elastic structure and the mutual wrapping relation. The regulating valve is better in pressure reduction capacity and higher in cavitation resistance, and in the working process, the erosion influence of fluid and particles in the fluid on the spring in the regulating valve is reduced to a certain extent.

Description

Technical Field

[0001] The present invention relates to a regulating valve, and relates to the fields of chemical industry, nuclear power, and in particular to a regulating valve and a method that are wear-resistant and highly durable. Background Art

[0002] High-pressure differential control valves are key equipment for controlling high-pressure differential fluids in industries such as petrochemicals, nuclear power, and supercritical thermal power. The core challenge lies in balancing precise control, anti-cavitation damage, and structural reliability.

[0003] In scenarios with high pressure difference and small flow precision regulation, traditional regulating valves mainly use multi-stage cage valves or symmetrical labyrinth valve structures, which have nonlinear flow and low control accuracy: multi-stage cage valves achieve pressure reduction by connecting throttling orifice plates in series, but the flow field interference between the orifice plates leads to poor pressure reduction capability; the symmetrical labyrinth flow channel has consistent bidirectional flow resistance and cannot suppress flow fluctuations caused by reverse backflow, exacerbating control instability.

[0004] The traditional valve core and internal spring are constantly washed by the medium during operation, resulting in great wear and tear, and frequent replacement of parts is required. Summary of the Invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a labyrinth control valve and method for resisting cavitation and wear. The present invention solves the common problems of cavitation damage inside the control valve and wear of the valve core components by high-speed fluid.

[0006] The technical solution adopted in the present invention is: The present invention includes a valve body assembly, a valve core assembly and a sleeve assembly. The valve body assembly has a built-in valve core assembly and a sleeve assembly, and is provided with an inlet and an outlet for fluid to flow through; the sleeve assembly is fixed in the valve cavity of the valve body assembly, and the valve core assembly can be coaxially movably sleeved in the sleeve assembly in an up-and-down manner; the sleeve assembly has a flow channel structure for reducing the pressure of high-pressure fluid, and the valve core assembly includes two valve cores wrapped together and an elastic structure between the two valve cores, and the opening control and protection are driven by the elastic structure and the mutual wrapping relationship between the two valve cores.

[0007] The valve body assembly includes a valve body and a valve cover, the valve cover is fixedly installed on the valve body, a valve cavity is provided in the valve body, and a sleeve assembly is fixedly sleeved in the valve cavity; a valve port is provided in the valve body that passes through up and down, an inlet and an outlet are provided at both ends of the valve body, the inlet and the upper end of the valve port are connected through the valve cavity, and the outlet and the lower end of the valve port are connected; a valve seat is sealed at the valve port, and the lower end of the sleeve assembly and the upper end of the valve seat are sealed.

[0008] The sleeve assembly includes a disc module, an upper sleeve and a lower sleeve arranged in the valve cavity. The disc module is mainly composed of a number of discs tightly stacked up and down in an annular shape. The upper sleeve, disc module and lower sleeve are coaxially arranged and tightly connected from top to bottom; a cylindrical cavity for the installation and movement of the valve core assembly is formed in the middle of the upper sleeve, disc module and lower sleeve; a plurality of Tesla valve flow channels are opened in each disc, and the plurality of Tesla valve flow channels are evenly spaced circumferentially, and each Tesla valve flow channel is arranged radially along the disc, so that the outer and inner sides of the disc flow through the Tesla valve flow channel; and the inlet of each Tesla valve flow channel is connected to the outer side of the disc, and the outlet is connected to the inner side of the disc.

[0009] The Tesla valve flow passages within the disc are evenly distributed around the circumference and feature multiple return loops. This increases flow resistance, slows the flow rate, and reduces the impact of high-pressure media on the sleeve assembly. It also prevents cavitation in high-pressure liquid media. Compared to other throttling channels, the multi-layer disc design through the Tesla valve flow passages is smaller and easier to manufacture. The disc's stoppers and grooves provide a tighter fit between the discs, reducing vibration within the sleeve assembly during high-speed fluid flow and enhancing structural strength.

[0010] The discs are stacked on top of each other. The discs are designed to be thinner and the flow area of ​​each layer is small, which can achieve precise control of the fluid. The flow rate at different openings changes linearly and the control accuracy is high.

[0011] The upper and lower adjacent discs are fixed by limiting blocks and limiting grooves, the upper sleeve is pressed on the uppermost disc of the disc module and is fixedly connected by limiting blocks and limiting grooves, and the lower sleeve is supported on the bottom surface of the lowermost disc of the disc module and is fixedly connected by limiting blocks and limiting grooves.

[0012] The valve core assembly includes a valve stem, a pre-start valve core, a spring, a main valve core and an upper valve disc. The main valve core is movably mounted in a cylindrical cavity formed inside the upper sleeve, the disc module and the lower sleeve and is sealed to the inner wall of the cylindrical cavity. A valve core cavity is opened inside the main valve core, the upper end of the valve core cavity passes through an opening, and a valve core port is opened at the lower end of the valve core cavity; an upper valve disc and a pre-start valve core are installed in the valve core cavity, the outer periphery of the upper valve disc is sealed and fixedly connected to the main valve core, the inner periphery of the upper valve disc is mounted on the lower end of the valve stem and is elastically connected to the lower part of the valve stem, the upper valve disc is provided with a channel for through-conduction up and down, and the upper end of the valve stem passes through the valve cover of the valve body assembly and is connected to an external driving member; a pre-start valve core is installed in the valve core cavity of the main valve core below the lower end of the upper valve disc, the top end of the pre-start valve core is fixedly connected to the lower end of the valve stem, and the bottom end of the pre-start valve core is connected to the valve core port of the main valve core.

[0013] The inner threaded hole is processed on the upper part of the pre-opening valve core, the outer thread is processed on the lower part of the valve rod, and the pre-opening valve core and the valve rod are threaded. The inner threaded hole is processed on the upper part of the main valve core, the outer threaded hole is processed on the lower part of the pre-opening valve core, the main valve core and the upper valve disc are connected by threads, and the upper valve disc moves together with the main valve core. When the valve core is in the closed state, the spring is compressed by the valve rod, and the sealing surface of the pre-opening valve core and the main valve core is in close contact.

[0014] A plurality of springs are arranged between the valve rod and the upper valve disc of the valve core assembly. Due to the elastic effect of the springs, the springs are compressed by the pressure transmitted by the valve rod in the closed state of the valve. When the valve is opened, the upward thrust of the spring facilitates the valve to overcome the pressure on the upper part, and the pre-opening valve core is more easily opened. This process reduces the force required by the valve rod and the pre-opening valve core, so that the pre-opening valve core can more easily separate from the sealing surface, complete the pre-starting of the valve, and solve the problem of difficult opening of the valve.

[0015] The upper valve disc body is a ring-shaped cylinder, an outer flange is fixedly arranged on the top end outer wall of the upper valve disc, the outer flange is fixedly connected between the top end surface of the main valve core, an inner flange is fixedly arranged on the bottom end inner wall of the upper valve disc, an outer flange is fixedly arranged on the lower part of the outer periphery of the valve rod close to the bottom end, and the outer flange of the valve rod and the inner flange of the upper valve disc are connected through the upward and downward arranged springs. A plurality of vertical through holes are arranged on the ring-shaped cylinder of the upper valve disc in a circumferential direction, and the plurality of vertical through holes are used as channels for upward and downward communication. The vertical through holes on the upper side and the lower side of the upper valve disc are parallel to the direction of the valve rod.

[0016] The space in the cylindrical cavity above the main valve core and the upper valve disc is connected with a fluid source outside through a pipeline in the valve body / valve cover, so that the fluid source drives the pre-opening to open when the fluid flows into the space; and when the pre-opening valve core is sealingly connected to the valve core port of the main valve core, a gap for pre-opening control is formed between the bottom surface of the upper valve disc and the top surface of the pre-opening valve core.

[0017] Due to the effect of the through hole of the upper valve disc, when the pre-opening valve core is opened, the high-pressure fluid in the upper part of the valve core assembly flows into the through hole and then flows out of the sealing surface through hole of the pre-opening valve core, which increases the pressure of the lower part of the valve core assembly and reduces the pressure difference between the upper and lower parts of the valve core assembly. When the valve core assembly moves, the problem that the valve core assembly cannot move upward due to too large pressure difference between the upper and lower parts is avoided.

[0018] There is a gap between the upper valve disc and the pre-opening valve core. When the pre-opening valve core is opened, it will collide with the upper valve disc. When the valve rod continues to apply tension upward, the pre-opening valve core is always in close contact with the upper valve disc, so that the upper valve disc and the main valve core can always be moved together during upward movement, and the control of the opening degree of the valve is realized.

[0019] The pre-start valve core is located inside the main valve core, preventing direct fluid impact and reducing stress during operation. Six springs are housed within a groove between the upper disc and the valve stem, enclosing the springs within a sealed space. This prevents the springs from being repeatedly eroded by the medium when the valve is closed or opened, minimizing damage and extending the service life of the components. This new design allows the springs to be located within the valve core assembly, resulting in a more compact structure and smaller size, making it suitable for a wide range of applications.

[0020] The bottom end of the pre-start valve core is processed into a tapered end, and the minimum diameter of the tapered end is smaller than the caliber of the valve core opening of the main valve core, so that the tapered end is connected to the valve core opening of the main valve core in a plug-in manner to achieve pre-start sealing; the valve seat is set to a chamfered structure at the inner edge of the top surface, and the outer edge of the bottom surface of the main valve core is set to a chamfered structure. The chamfered structure of the main valve core is used to cooperate with the chamfered structure of the valve seat to seal and control the closure of the labyrinth regulating valve.

[0021] The outer diameter of the main valve core is equal to the inner diameter of the cylindrical cavity of the sleeve assembly, and the outer diameters of the upper sleeve, the disc and the lower sleeve are equal to the inner diameter of the valve cavity of the valve body.

[0022] The diameter of the valve stem is equal to the diameter of the through hole on the upper part of the valve cover; the outer diameter of the sealing ring is equal to the inner diameter of the sleeve assembly, and the outer diameter of the metal spiral wound gasket is equal to the diameter of the upper part of the valve seat.

[0023] The main valve core diameter is equal to the inner diameter of the sleeve disc. This structural design increases the core's structural strength, making it less susceptible to breakage under fluid impact. When the core assembly is fully closed, fluid cannot pass through the internal channels of the disc. When the valve is open, fluid outside the sleeve passes through the internal Tesla valve flow channel. The wider the valve core is in the open position, the more channels flow through the sleeve, resulting in a greater outlet flow rate.

[0024] Under normal conditions, the bottom end of the pre-start valve core is sealed and connected to the valve core port of the main valve core, the bottom end of the main valve core is connected to the valve seat to form a seal, and the main valve core blocks the inner circumference of the disc in the sleeve assembly; high-pressure fluid enters the upper space in the cylindrical cavity; When the valve is about to open, the high-pressure fluid first flows downward from the through-hole of the upper valve disc into the main valve core cavity that accommodates the pre-start valve core; the upward movement of the valve stem drives the pre-start valve core to move upward first, and the seal between the pre-start valve core and the main valve core is first broken, and the valve changes from the closed state to the open state. A part of the high-pressure fluid first flows downward from the valve core port of the main valve core and then enters the bottom of the valve body cavity, thereby achieving pressure balance on the upper and lower sides of the valve core assembly; Then, the valve stem continues to move upwards to drive the pre-opening valve core to move upwards, and the spring and the pre-opening valve core contact to drive the upper valve disc to move upwards and further drive the main valve core to move upwards, so that the main valve core no longer blocks the inner circumferential surface of the disc in the sleeve assembly, the high-pressure fluid flows from the outside of the disc through the inlet of the valve body, and after the pressure is reduced through the mutual impact and dissipation between the multiple flow channels of the Tesla valve flow channel, the fluid flows out from the inside of the disc, and finally flows into the cylindrical cavity and then flows out from the outlet of the valve body through the valve port.

[0025] In specific implementation, the pre-opening high-pressure fluid and the fluid flowing through the inlet and outlet of the labyrinth regulating valve below can be the same fluid or different fluids.

[0026] The labyrinth disc regulating valve of the Tesla valve flow channel of the present application can enhance the pressure reduction performance of the valve and weaken the influence of the fluid scouring on the internal spring of the pre-opening valve core during operation, the sleeve structure is stacked by a plurality of discs, so that the valve can also have good regulation accuracy during pressure reduction of the fluid, and can smoothly reduce the pressure of the high-pressure fluid; the valve core is a spring pre-opening structure, and when the fluid medium flows through the valve core, the spring is prevented from being repeatedly scoured.

[0027] The present application has the following advantages: 1. The Tesla valve disc pressure reduction function of the present application enables the high-pressure fluid to complete step-by-step pressure reduction inside the channel when passing through, thereby reducing the generation of cavitation. The connection mode of the discs and the upper and lower sleeves ensures that the present application has high structural strength and anti-shock capacity.

[0028] 2. The pre-opening valve core of the present application enables the valve core assembly to achieve pressure balance between the upper and lower parts during the preparation of opening, and when the pre-opening valve core is opened, the passage of a small amount of fluid reduces the pressure difference between the upper and lower parts of the valve core assembly, thereby facilitating the movement of the entire valve core assembly; the spring provides a part of upward thrust during the opening of the pre-opening valve core, thereby facilitating the opening of the pre-opening valve core.

[0029] 3. The design of the upper valve disc and the valve stem of the present application enables the spring to be located inside a sealed space, thereby avoiding the continuous scouring of the spring by the medium during operation and prolonging the service life of the spring.

[0030] 4. The structural design of the labyrinth sleeve assembly of the present application enables the flow under different opening degrees to change linearly and have high control accuracy, and the present application has strong applicability in high-pressure difference working conditions.

[0031] In summary, the labyrinth regulating valve of the present invention can achieve better anti-cavitation capability and weaken the erosion effect of the fluid on the valve core assembly. The sleeve adopts a multi-layer Tesla valve flow channel disc, so that the fluid dissipates impact inside the sleeve, achieving a reduction in flow rate and pressure, which can reduce cavitation and wear. The pre-start valve core adopts a spring-sealed structure to avoid the spring being constantly eroded by the medium and increase its service life. Compared with traditional regulating valves, the labyrinth regulating valve of the present invention has a stronger pressure reduction capability, can effectively weaken cavitation and wear, and has less impact on the pre-start valve core and less wear on the spring inside the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 It is a schematic diagram of the sleeve structure of the present invention; Figure 4 It is a schematic diagram of the structure of the disc part of the present invention; Figure 5 This is a schematic structural diagram of the valve core portion of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the valve core part of the present invention.

[0033] In the figure: 1. Valve body, 2. Valve cover, 3. Valve stem, 4. Pre-start valve core, 5. Main valve core, 6. Upper valve disc, 7. Spring, 8. Sealing ring, 9. Valve seat, 10. Metal spiral wound gasket, 11. Lower sleeve, 12. Disc, 13. Upper sleeve, 14. Bolt, 15. Nut. DETAILED DESCRIPTION

[0034] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings to facilitate understanding of the present invention by those skilled in the art. The embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0035] like Figure 1 As shown, the valve structure of the present invention includes a valve body assembly, a valve core assembly and a sleeve assembly. The valve body assembly has a built-in valve core assembly and a sleeve assembly, and is provided with an inlet and an outlet for fluid to flow through; the sleeve assembly is fixed in the valve cavity of the valve body assembly, and the valve core assembly can be coaxially movably sleeved in the sleeve assembly up and down.

[0036] The sleeve assembly has a flow channel structure for reducing the pressure of high-pressure fluid, and the flow channel structure connects the valve cavity with the inlet and outlet; the valve core assembly includes two valve cores wrapped around each other and an elastic structure between the two valve cores. The elastic structure and the mutual wrapping relationship between the two valve cores drive opening control and protection. The wrapping relationship of the two valve cores protects the valve core located at the core position on the inner side from cavitation and wear. The elastic relationship of the two valve cores allows the valve core to be pre-started without being directly impacted, thereby increasing its service life.

[0037] The valve body assembly includes a valve body 1 and a valve cover 2. The valve cover 2 is installed on the valve body 1 for fluid to flow through, and has a built-in valve core assembly and a sleeve assembly.

[0038] In practice, the valve body is a casting, integrally formed by casting. The valve cover is a forging, formed by cutting. The valve cover is mounted on the top surface of the valve body and sealed to the valve body via bolts 14 and nuts 15. Internally threaded holes are drilled in the upper end surface of the valve body 1, allowing bolts to pass through the through-holes in the valve cover. Nuts are used to tightly connect the valve cover 2 and the valve body 1, making them removable.

[0039] The valve core assembly is used to control the flow and disconnection of the fluid in the valve body 1. The valve core assembly includes a pre-start valve core 4 and a main valve core 5. The valve core assembly is installed in the upper cavity of the valve body 1 and the main valve core 5 is located in the valve body 1.

[0040] The sleeve assembly is installed inside the valve body 1 and is used to reduce the pressure of high-pressure fluid. The sleeve assembly includes a disc 12 for improving the pressure reduction performance.

[0041] like Figure 2 As shown, the valve body assembly includes a valve body 1 and a valve cover 2. The valve cover is fixedly installed on the valve body 1. A valve cavity is provided in the valve body 1, and a sleeve assembly is fixedly installed in the valve cavity. The valve cavity main body of the valve body 1 is an S-shaped structure. The top end of the valve body 1 is installed on the bottom end of the valve cover 2 to seal the upper end opening of the valve cavity.

[0042] A valve port is provided in the valve body 1, which is vertically connected. The horizontal valve port is vertically connected. An inlet and an outlet are provided at both ends of the valve body 1. The inlet and the outlet are connected to the two ends of the valve port respectively. The inlet is connected to the upper end of the valve port through the valve cavity, and the outlet is connected to the lower end of the valve port. The valve seat 9 is sealed and installed at the valve port, and the lower end of the sleeve assembly and the upper end of the valve seat 9 are sealed and connected.

[0043] The valve cover is a rotating flange structure coaxially sealed and installed on the top surface of the upper disc structure of the valve body 1. The valve core assembly is located inside the valve cover 2 and the valve body 1 and is coaxially installed inside the sleeve assembly. The valve stem 3 is coaxial with the middle opening of the valve cover 2 and extends outward partially.

[0044] In the embodiment, an upper flow channel is arranged above the valve port, a lower flow channel is arranged below the valve port, a valve cavity is arranged in the upper flow channel, the valve port is communicated with the inlet through the upper flow channel, the valve port is communicated with the outlet through the lower flow channel, and the upper flow channel and the lower flow channel are communicated through the valve port.

[0045] As shown in Figure 2 and Figure 3 , the sleeve assembly comprises a disc module arranged in the valve cavity, an upper sleeve 13 and a lower sleeve 11, the disc module is mainly composed of a plurality of discs 12 arranged in an annular upper and lower close stack, the upper sleeve 13, the disc module and the lower sleeve 11 are coaxially arranged from top to bottom and closely connected; a cylindrical cavity for installing and moving the valve core assembly is formed in the middle of the upper sleeve 13, the disc module and the lower sleeve 11.

[0046] The top surface of the upper sleeve 13 is in contact with the valve cover 2, the upper sleeve 13, the disc module and the lower sleeve 11 are fixed as a whole in the valve cavity by the valve cover 2 pressing downward, and the bottom surface of the lower sleeve 11 is in close contact with the inner bottom surface of the valve cavity.

[0047] The inner circumferential surfaces of the disc module, the upper sleeve 13 and the lower sleeve 11 are on the same cylinder surface, and the outer circumferential surfaces of the disc module, the upper sleeve 13 and the lower sleeve 11 are on the same cylinder surface.

[0048] As shown in Figure 4 , a plurality of Tesla valve flow channels are arranged in each disc 12, the plurality of Tesla valve flow channels are evenly distributed in a circumferential direction, each Tesla valve flow channel is arranged in a radial direction of the disc 12, so that the fluid flows through the Tesla valve flow channel between the outer side and the inner side of the disc 12; and the inlet of each Tesla valve flow channel is communicated with the outer side of the disc 12, and the outlet is communicated with the inner side of the disc 12, so that the fluid flows from the outer side to the inner side of the disc 12.

[0049] The disc 12 is connected with the upper sleeve 13 and the lower sleeve 11 by the limiting block, and the three are coaxially assembled in the valve body 1.

[0050] As shown in Figure 4 , the upper and lower adjacent discs 12 in the disc module are fixed by the limiting block and the limiting groove, the upper sleeve 13 is pressed on the uppermost disc 12 of the disc module and is fixed and connected by the limiting block and the limiting groove, and the lower sleeve 11 is supported on the bottom surface of the lowermost disc 12 of the disc module and is fixed and connected by the limiting block and the limiting groove; the upper part of the sleeve assembly is fixed with the bottom part of the valve cover 2, and the lower part is fixed with the valve seat 9.

[0051] The upper sleeve 13 is a stepped cylinder structure and is coaxially installed in the upper passage of the valve body 1 and is fixed against the stepped structure of the lower part of the valve cover 2. The disc 12 is cut from a disc-shaped forged piece. The limiting block at the outer edge of the upper part of the disc 12 is fixed with the groove at the bottom of the sleeve, and the disc is coaxially installed with the upper and lower sleeves. The disc is provided with a groove at the lower part. The discs are fixed with each other by the limiting block and the groove. A plurality of Tesla valve flow channels are cut on the upper surface of the disc 12. The channels are composed of a plurality of backflow rings to achieve the function of fluid impact dissipation. The lower sleeve 11 is a cylindrical structure. The upper part is provided with a limiting block to fix the disc module. The lower part is fixed with the upper part of the valve seat 9 and the valve body 1. In order to strengthen the stability of the sleeve assembly structure, the outer edge of the connecting surface of the upper sleeve 13, the disc module and the lower sleeve 11 can be welded.

[0052] Specifically, for each upper and lower adjacent disc 12, the lower disc 12 is provided with a plurality of limiting grooves at the circumferential edge, and the upper disc 12 is provided with a plurality of limiting blocks matched with the limiting grooves at the circumferential edge. Each limiting groove and each limiting block are matched one by one in position, so that the lower disc 12 and the upper disc 12 are embedded together.

[0053] In this way, each disc 12 is spliced by the limiting block, and the discs are fixed after splicing by welding. The combined disc is welded and fixed with the upper sleeve and the lower sleeve. The upper part of the sleeve assembly is fixed with the inner circle of the upper part of the valve body and the bottom of the valve cover. The lower part of the sleeve assembly is fixed with the upper part of the valve seat. The flow channel in the shape of Tesla valve is machined in the disc. The tip of the flow channel is directed towards the outer wall of the sleeve. For example, four limiting blocks are machined at the edge of the upper surface of the disc. The four limiting blocks are distributed in 90° circumferential order on the disc. Four limiting grooves are machined at the lower part of the disc. The four limiting grooves are distributed in 90° circumferential order on the disc. The limiting grooves can be tightly matched with the limiting blocks.

[0054] The valve seat 9 is embedded in the valve port through the stepped structure and is sealed by the metal winding gasket 11. The bottom surface of the lower sleeve 11 of the sleeve assembly is tightly and sealingly connected with the top surface of the valve seat 9. Specifically, the valve seat 10 is coaxially and sealingly installed in the middle part of the valve body 1. The metal winding gasket 11 is located between the contact surface of the valve seat 9 and the valve body.

[0055] The inner wall of the upper sleeve 13 and the valve cavity are sealingly connected by the sealing ring 8.

[0056] Two sealing rings 8 are embedded in the outer groove of the main valve core 5 to prevent the fluid in the gap between the sleeve and the main valve core 5 from flowing into the upper cavity when the valve is opened. The metal winding gasket 10 is arranged at the connection between the valve seat 9 and the valve body 1 to prevent the fluid from flowing out of the gap between the valve seat 9 and the valve body 1 and to reduce the leakage rate of the valve.

[0057] As Figure 2 and Figure 5 , Figure 6 As shown, the valve core assembly includes a valve stem 3, a pre-start valve core 4, a spring 7, a main valve core 5 and an upper valve disc 6. The main valve core 5 is movably sleeved in a cylindrical cavity formed inside the upper sleeve 13, the disc module and the lower sleeve 11 and is sealed to the inner wall of the cylindrical cavity. A valve core cavity is defined inside the main valve core 5, with an opening extending through the upper end of the valve core cavity and a valve core port defined at the lower end of the valve core cavity. The main valve core 5 is a cylindrical structure with two grooves on the upper outer wall for placing the sealing ring 8. The lower sealing surface adopts an inclined chamfer design. The valve core port is opened at the lower end of the cylindrical structure. Figure 5 shown.

[0058] An upper valve disc 6 and a pre-start valve core 4 are installed in the valve core cavity. The outer periphery of the upper valve disc 6 is sealed and fixedly connected to the main valve core 5. The inner periphery of the upper valve disc 6 is sleeved on the lower end of the valve stem 3 and is elastically connected to the lower part of the valve stem 3. The upper valve disc 6 is provided with a channel for vertical communication. The upper end of the valve stem 3 passes through the valve cover 2 of the valve body assembly and then passes through the valve cavity and is connected to an external driving component. A pre-start valve core 4 is installed in the valve core cavity of the main valve core 5 below the lower end of the upper valve disc 6. The top end of the pre-start valve core 4 is fixedly connected to the lower end of the valve stem 3 via threads, and the bottom end of the pre-start valve core 4 is connected to the valve core port of the main valve core 5. The upper end of the valve stem 3 passes through the middle hole of the valve cover 2, and the lower end of the valve stem 3 is tightly connected to the pre-start valve core 4; the pre-start valve core 4 is located at the bottom of the valve stem 3 and is connected to the valve stem 3 via threads.

[0059] like Figure 5 and Figure 6 As shown, the main body of the upper valve disc 6 is an annular cylinder, and the outer wall of the top end of the upper valve disc 6 is fixedly provided with an outer flange, which is fixedly connected to the top end surface of the main valve core 5. The inner wall of the bottom end of the upper valve disc 6 is fixedly provided with an inner flange, and the outer periphery of the lower part of the valve stem 3 near the bottom end is fixedly provided with an outer flange. The outer flange of the valve stem 3 and the inner flange of the upper valve disc 6 are connected by springs 7 arranged above and below. A plurality of vertical through holes are provided on the annular cylinder of the upper valve disc 6 at intervals along the circumferential direction. The plurality of vertical through holes serve as channels for upward and downward communication. The vertical through holes on the upper and lower sides of the upper valve disc 6 are parallel to the direction of the valve stem 3.

[0060] In a specific embodiment, multiple springs 7 are provided, and the multiple springs 7 are evenly spaced along the circumference and connected between the outer flange step of the valve stem 3 and the inner flange step of the upper valve disc 6. The upper end of the spring 7 is connected to the bottom surface of the outer flange of the valve stem 3, and the lower end is connected to the top surface of the inner flange of the upper valve disc 6.

[0061] In a specific implementation, the bottom surface of the outer flange of the valve stem 3 and the top surface of the inner flange of the upper valve disc 6 are both provided with holes for embedding springs. Each spring 7 is arranged in the hole groove of the upper valve disc 6 and the valve stem 3. The upper part of the spring is connected to the lower hole groove of the valve stem 3, and the lower part is connected to the hole groove of the upper valve disc 6.

[0062] The space within the cylindrical cavity above the outer flange of the main valve core 5, the upper valve disc 6 and the valve stem 3 is connected to the external high-pressure fluid source through the pipeline inside the valve body 1 / valve cover 2, so that the high-pressure fluid source can inject fluid into the space to drive the pre-start opening; when the bottom end of the pre-start valve core 4 is sealed and connected to the valve core port of the main valve core 5, that is, before the pre-start opening, there is a gap for pre-start control between the bottom surface of the upper valve disc 6 and the top surface of the pre-start valve core 4.

[0063] The bottom end of the pre-start valve core 4 is processed into a conical end portion, the minimum diameter of the conical end portion is smaller than the diameter of the valve core opening of the main valve core 5, and the maximum diameter of the conical end portion is larger than the diameter of the valve core opening of the main valve core 5, so that the conical end portion is connected to the valve core opening of the main valve core 5 in a plug-in manner to realize pre-start sealing; The inner edge of the top surface of the valve seat 9 is configured as a chamfered structure as a sealing surface, and the outer edge of the bottom surface of the main valve core 5 is configured as a chamfered structure as a sealing surface. The chamfered structure of the main valve core 5 is used to cooperate with the chamfered structure of the valve seat 9 to seal and control the closure of the labyrinth regulating valve. This results in a chamfered sealing surface on the lower portion of the main valve core 5, and the chamfered structure has the same chamfer angle as the sealing surface of the chamfered structure of the valve seat 9.

[0064] The outer diameter of the main valve core 5 is equal to the inner diameter of the cylindrical cavity of the sleeve assembly, and the outer diameters of the upper sleeve 13, the disc 12 and the lower sleeve 11 are equal to the inner diameter of the valve cavity of the valve body 1.

[0065] The diameter of the valve stem 3 is equal to the diameter of the through hole on the upper part of the valve cover 2; the outer diameter of the sealing ring 8 is equal to the inner diameter of the sleeve assembly, and the outer diameter of the metal spiral wound gasket 10 is equal to the diameter of the upper part of the valve seat 9.

[0066] The valve stem 3 is made of bar material, and the lower part is processed into a disc-shaped structure as an outer flange. Six circular spring grooves are opened at the lower part of the outer flange; an external thread is cut on the lower surface of the valve stem 3, and an internal thread is tapped on the upper part of the pre-start valve core 4, and the two are tightened and connected.

[0067] The annular body of the upper disc 6 is machined with several through-holes for steam flow during pre-start. Near the central through-hole are six spring slots. Six springs are located between the disc-shaped structure at the bottom of the valve stem and the upper disc, and are retained within the fixed slots. During valve core assembly, the springs are positioned within the spring slots of the valve stem 3 and upper disc 6. The diameter of the lower outer flange of the valve stem 3 is equal to the inner diameter of the annular body of the upper disc 6, and the diameter of the upper cylindrical portion of the pre-start valve core 4 is equal to the diameter of the central through-hole of the upper disc 6. After assembly, the springs are enclosed in a sealed space, preventing erosion by the fluid medium.

[0068] The diameter of the main valve core 5 is equal to the inner diameter of the sleeve assembly, and its bottom is chamfered at the same angle as the valve seat. When the valve core assembly is at its lowest point, the main valve core 5 completely seals the valve seat 9 and the outlet hole of the sleeve assembly, preventing leakage when the valve is closed. The central through hole of the main valve core 5 is chamfered at the same angle as the bottom of the pre-start valve core 4 to ensure a sealed pre-start sealing surface.

[0069] The top of the main valve core 5 and the upper disc 6 are connected by welding or bolts to ensure a secure connection. When the pre-start valve core 4 contacts the pre-start sealing surface of the main valve core 5, a gap exists between the upper disc 6 and the pre-start valve core 4. During pre-start, the pre-start valve core 4 has a sufficient clearance to open the pre-start sealing surface, allowing some fluid to flow out and achieve pressure balance above and below the main valve core 5. When the valve is open, the pre-start valve core 4 and the upper disc 6 are in contact, and the valve stem 3 drives the movement of the entire valve core assembly.

[0070] Under normal circumstances, when the valve is fully closed, the bottom end of the pre-start valve core 4 is sealed and connected to the valve core port of the main valve core 5, and the sealing surface of the bottom end of the main valve core 5 is connected to the sealing surface of the valve seat 9 to form a seal, and the main valve core 5 blocks the inner circumference of the disc 12 of the disc module in the sleeve assembly, so that the Tesla valve flow channel therein cannot flow; the fluid source delivers high-pressure fluid into the upper space in the cylindrical cavity, filling the upper space in the cylindrical cavity. The high-pressure fluid medium will fill the upper cavity of the valve core assembly, and the valve needs to overcome the upper and lower pressure differences to open; When the valve is about to open, the high-pressure fluid first flows downward from the through hole of the upper valve disc 6 into the valve core cavity of the main valve core 5 below the lower end of the upper valve disc 6, which accommodates the pre-start valve core 4, and then reaches the sealing surface between the pre-start valve core 4 and the main valve core 5; The upward movement of the valve stem 3 drives the pre-start valve core 4 to move upward first, and the seal between the pre-start valve core 4 and the main valve core 5 changes to conduction. The seal between the pre-start valve core 4 and the main valve core 5 is first broken, and the valve changes from a closed state to an open state. A part of the high-pressure fluid first flows downward from the valve core port of the main valve core 5 into the valve port of the valve body 1, and then enters the bottom of the valve cavity of the valve body 1, thereby achieving pressure balance on the upper and lower sides of the valve core assembly, which is convenient for the subsequent opening of the valve; Then, the valve stem 3 continues to move upward, driving the pre-start valve core 4 to move upward, and the contact between the spring 7 and the pre-start valve core 4 drives the upper valve disc 6 to move upward, and then drives the main valve core 5 to move upward, thereby driving the valve core assembly to move upward as a whole, so that the main valve core 5 no longer blocks the inner circumference of the disc 12 of the disc module in the sleeve assembly, and the high-pressure fluid flows in from the outside of the disc 12 through the inlet of the valve body 1, and flows out from the inside of the disc 12 after the pressure is reduced due to mutual impact and dissipation between the multi-stage flow channels of the Tesla valve flow channel, and finally flows into the cylindrical cavity, and then flows out from the outlet of the valve body 1 through the valve port.

[0071] By adjusting the upward movement height of the main valve core 5, that is, adjusting the area of ​​the inner circumference of the disc 12 of the disc module in the sleeve assembly blocked by the main valve core 5, the opening is adjusted. The greater the upward movement height of the main valve core 5, the smaller the blocked area, the larger the valve core opens, the more layers of the disc 12 pass through, the more Tesla valve flow channels pass through the disc 12, and the greater the flow rate at the outlet.

[0072] Therefore, the valve core of this valve adopts a pre-starting method. First, under the action of the tension of the valve stem 3 and the thrust of the spring 7, the pre-starting valve core 4 first separates from the pre-starting sealing surface, and the high-pressure fluid on the upper part of the valve core assembly flows in from the through hole of the upper valve disc 6 and flows out from the pre-starting sealing surface, realizing the upper and lower pressure balance; the spring 7 is located in the closed cavity and will not be eroded by the fluid medium.

[0073] And when the pre-start valve core 4 hits the bottom of the upper valve disc 6, the valve stem 3 drives the entire valve core assembly to open upward, and when the main valve core 5 is in different positions, the valve opening can be controlled at different degrees.

[0074] The fluid enters from the outer surface of the disc module and circulates in the Tesla valve flow channel. When passing through the internal return ring, the fluid impacts and dissipates each other, and the flow rate and pressure are reduced, thereby achieving decompression inside the sleeve. The flow rate of the fluid flowing out of the sleeve will decrease, and the impact load on the main valve core 5 will be reduced, thereby weakening the impact and abrasion effect of the fluid on the main valve core 5.

[0075] It can be seen from this implementation that compared with the traditional regulating valve, the regulating valve of the present invention has better pressure reduction capability and stronger anti-cavitation ability, and during operation, the erosion effect of the fluid and particles in the fluid on the internal spring is reduced to a certain extent.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A labyrinth regulating valve that resists cavitation and wear, characterized by: It includes a valve body assembly, a valve core assembly and a sleeve assembly. The valve body assembly has a built-in valve core assembly and a sleeve assembly, and is provided with an inlet and an outlet for fluid to flow through; the sleeve assembly is fixed in the valve cavity of the valve body assembly, and the valve core assembly can be coaxially movably sleeved in the sleeve assembly up and down; the sleeve assembly has a flow channel structure for reducing the pressure of high-pressure fluid, and the valve core assembly includes two valve cores wrapped together and an elastic structure between the two valve cores. The opening control and protection are driven by the elastic structure and the mutual wrapping relationship between the two valve cores.

2. The cavitation and wear-resistant labyrinth regulating valve according to claim 1, characterized in that: The valve body assembly comprises a valve body (1) and a valve cover (2), the valve cover is fixedly mounted on the valve body (1), a valve cavity is provided in the valve body (1), and a sleeve assembly is fixedly sleeved in the valve cavity; a valve port is provided in the valve body (1) and is connected vertically; an inlet and an outlet are provided at both ends of the valve body (1); the inlet and the upper end of the valve port are connected through the valve cavity, and the outlet and the lower end of the valve port are connected; a valve seat (9) is sealingly mounted at the valve port, and the lower end of the sleeve assembly is sealingly connected to the upper end of the valve seat (9).

3. The cavitation and wear-resistant labyrinth regulating valve according to claim 1, characterized in that: The sleeve assembly includes a disc module, an upper sleeve (13) and a lower sleeve (11) arranged in a valve cavity, wherein the disc module is mainly composed of a plurality of discs (12) arranged in an annular shape and tightly stacked up and down, and the upper sleeve (13), the disc module and the lower sleeve (11) are coaxially arranged and tightly connected from top to bottom; a cylindrical cavity for the installation and movement of the valve core assembly is formed in the middle of the upper sleeve (13), the disc module and the lower sleeve (11); A plurality of Tesla valve flow channels are provided in each disc (12), and the plurality of Tesla valve flow channels are evenly spaced in the circumferential direction. Each Tesla valve flow channel is arranged radially along the disc (12), so that the outer side and the inner side of the disc (12) flow through the Tesla valve flow channel; and the inlet of each Tesla valve flow channel is connected to the outer side of the disc (12), and the outlet is connected to the inner side of the disc (12).

4. The cavitation and wear-resistant labyrinth regulating valve according to claim 3, characterized in that: The upper and lower adjacent discs (12) are fixed by a limit block and a limit slot, the upper sleeve (13) is pressed on the uppermost disc (12) of the disc module and is fixedly connected by the limit block and the limit slot, and the lower sleeve (11) is supported on the bottom surface of the lowermost disc (12) of the disc module and is fixedly connected by the limit block and the limit slot.

5. The cavitation and wear-resistant labyrinth regulating valve according to claim 1, characterized in that: The valve core assembly comprises a valve stem (3), a pre-start valve core (4), a spring (7), a main valve core (5) and an upper valve disc (6); the main valve core (5) is movably sleeved in a cylindrical cavity formed inside the upper sleeve (13), the disc module and the lower sleeve (11) and is sealed to the inner wall of the cylindrical cavity; a valve core cavity is provided inside the main valve core (5); an opening is passed through the upper end of the valve core cavity, and a valve core port is provided at the lower end of the valve core cavity; An upper valve disc (6) and a pre-start valve core (4) are installed in the valve core cavity. The outer periphery of the upper valve disc (6) is sealed and fixedly connected to the main valve core (5). The inner periphery of the upper valve disc (6) is sleeved on the lower end of the valve stem (3) and elastically connected to the lower part of the valve stem (3). The upper valve disc (6) is provided with a channel for upward and downward communication. The upper end of the valve stem (3) passes through the valve cover (2) of the valve body assembly and is connected to an external driving member. A pre-start valve core (4) is installed in the valve core cavity of the main valve core (5) below the lower end of the upper valve disc (6). The top end of the pre-start valve core (4) is fixedly connected to the lower end of the valve stem (3), and the bottom end of the pre-start valve core (4) is connected to the valve core port of the main valve core (5).

6. The cavitation and wear-resistant labyrinth regulating valve according to claim 5, characterized in that: The main body of the upper valve disc (6) is an annular column, and the outer wall of the top end of the upper valve disc (6) is fixedly provided with an outer flange, and the outer flange is fixedly connected to the top end face of the main valve core (5), and the inner wall of the bottom end of the upper valve disc (6) is fixedly provided with an inner flange, and the outer periphery of the lower part of the valve stem (3) near the bottom end is fixedly provided with an outer flange, and the outer flange of the valve stem (3) and the inner flange of the upper valve disc (6) are connected by springs (7) arranged up and down; a plurality of vertical through holes are provided on the annular column of the upper valve disc (6) at intervals along the circumference, and the plurality of vertical through holes serve as channels for upward and downward communication, and the vertical through holes on the upper and lower sides of the upper valve disc (6) are parallel to the direction of the valve stem (3).

7. The cavitation and wear-resistant labyrinth regulating valve according to claim 5, characterized in that: The space in the cylindrical cavity above the main valve core (5) and the upper valve disc (6) is connected to an external fluid source through a pipeline inside the valve body (1) / valve cover (2), so that the fluid source can enter the space to drive the pre-start opening; when the bottom end of the pre-start valve core (4) is sealed and connected to the valve core port of the main valve core (5), a gap for pre-start control is provided between the bottom surface of the upper valve disc (6) and the top surface of the pre-start valve core (4).

8. The cavitation and wear-resistant labyrinth regulating valve according to claim 3 or 5, characterized in that: The bottom end of the pre-start valve core (4) is processed into a conical end, and the minimum diameter of the conical end is smaller than the diameter of the valve core opening of the main valve core (5), so that the conical end is connected to the valve core opening of the main valve core (5) in a plug-in manner to achieve pre-start sealing; the valve seat (9) is set as a chamfered structure on the inner edge of the top surface, and the outer edge of the bottom surface of the main valve core (5) is set as a chamfered structure. The chamfered structure of the main valve core (5) is used to cooperate with the chamfered structure of the valve seat (9) to seal and control the closing of the labyrinth regulating valve.

9. The method for controlling the pre-start and pressure reduction of a labyrinth regulating valve against cavitation and wear according to any one of claims 1 to 8, characterized in that: Under normal conditions, the bottom end of the pre-start valve core (4) is sealed and connected to the valve core port of the main valve core (5), the bottom end of the main valve core (5) is connected to the valve seat (9) to form a seal, and the main valve core (5) blocks the inner peripheral surface of the disc (12) in the sleeve assembly; high-pressure fluid enters the upper space in the cylindrical cavity; When the valve is to be opened, the high-pressure fluid first flows downward from the through hole of the upper valve disc (6) into the valve core cavity of the main valve core (5) accommodating the pre-start valve core (4); the valve stem (3) moves upward, driving the pre-start valve core (4) to move upward first, and the seal between the pre-start valve core (4) and the main valve core (5) is first disconnected, and the valve changes from the closed state to the open state. A part of the high-pressure fluid first flows downward from the valve core port of the main valve core (5) into the valve port of the valve body (1), and then enters the bottom of the valve cavity of the valve body (1), thereby achieving pressure balance between the upper and lower sides of the valve core assembly; Then, the valve stem (3) continues to move upward, driving the pre-start valve core (4) to move upward, and the contact between the spring (7) and the pre-start valve core (4) drives the upper valve disc (6) to move upward, and then drives the main valve core (5) to move upward, thereby driving the valve core assembly to move upward as a whole, so that the main valve core (5) no longer blocks the inner peripheral surface of the disc (12) in the sleeve assembly, and the high-pressure fluid flows in from the outside of the disc (12) through the inlet of the valve body (1), and flows out from the inside of the disc (12) after the pressure is reduced due to mutual impact and dissipation between the multi-stage flow channels of the Tesla valve flow channel, and finally flows into the cylindrical cavity, and then flows out from the outlet of the valve body (1) through the valve port.

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