control valve

Abstract

The application provides a regulating valve, and relates to the technical field of valves, which comprises a valve body, a valve seat, a valve core assembly and a noise reduction assembly. The valve body is provided with an inlet, an outlet and a medium cavity for medium circulation. The medium cavity is in communication with the inlet and the outlet respectively. The medium cavity comprises a first valve body cavity and a second valve body cavity in communication with the first valve body cavity through a communication hole. The first valve body cavity is in communication with the inlet, and the second valve body cavity is in communication with the outlet. The valve seat is arranged on the valve body at the communication hole. The valve core assembly is at least partially located in the first valve body cavity. The valve core assembly is slidingly arranged on the valve seat to control the on-off of the communication between the first valve body cavity and the second valve body cavity. The noise reduction assembly is arranged in the second valve body cavity. The noise reduction assembly is used for reducing the noise during medium circulation. The first end of the noise reduction assembly is located at the communication hole and abuts against the valve seat. The second end of the noise reduction assembly is provided with a positioning structure between the inner cavity wall of the second valve body cavity. By arranging the positioning structure, the probability of resonance and violent vibration of the noise reduction assembly is reduced.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more particularly to a regulating valve. Background Technology

[0002] In modern industrial fluid automatic control systems, such as feedwater pump flow recirculation systems and main steam desuperheating and pressure reduction systems in thermal power plants, as well as high-temperature black water pipeline systems in the coal chemical industry, control valves play a crucial role. These industrial scenarios are typically accompanied by extremely high medium pressure and large inlet-outlet pressure differentials. When high-pressure fluid flows through the narrow throttling section inside the control valve, the flow velocity increases sharply, and the static pressure drops drastically.

[0003] To address the severe challenges posed by high pressure differential conditions, control valves employ noise reduction components (typically in the form of a porous valve cage structure). The primary function of these components is to break down a concentrated and destructive high-speed flow into numerous smaller jets through multi-stage dispersion throttling, thereby increasing fluid resistance and dissipating fluid kinetic energy to reduce flow velocity, stabilize pressure, and mitigate turbulent noise. However, in related technologies, because the noise reduction component is only fixed at the upper or middle section, leaving the lower end suspended, the cantilevered valve cage structure is highly susceptible to resonance and severe vibration under the intense impact of the high pressure differential medium. This not only generates high-decibel noise but may also lead to fatigue fracture of internal valve components. Summary of the Invention

[0004] This application provides a regulating valve to solve the technical problem that, since the noise reduction component is only fixed at the upper or middle part, and its lower end is suspended, the valve cage of the cantilever beam structure is prone to resonance and severe vibration under the strong impact of the high pressure differential medium.

[0005] This application provides a regulating valve, comprising: A valve body having an inlet, an outlet, and a medium cavity for flowing medium, the medium cavity being connected to the inlet and the outlet respectively, the medium cavity including a first valve body cavity and a second valve body cavity connected to the first valve body cavity through a connecting hole, the first valve body cavity being connected to the inlet, and the second valve body cavity being connected to the outlet; A valve seat is disposed on the valve body at the communicating hole; A valve core assembly, at least partially located within the first valve body cavity, is slidably disposed on the valve seat to control the opening and closing of the connection between the first valve body cavity and the second valve body cavity; A noise reduction component is disposed in the second valve body cavity. The noise reduction component is used to reduce the noise when the medium flows. The noise reduction component has a first end and a second end opposite to each other. The first end of the noise reduction component is located in the connecting hole and abuts against the valve seat. A positioning structure is provided between the second end of the noise reduction component and the inner wall of the second valve body cavity.

[0006] In one embodiment of this application, the positioning structure includes an annular protrusion and a positioning convex shaft, the annular protrusion forming a central hole, and the positioning convex shaft extending into the central hole of the annular protrusion; The annular protrusion is disposed on the inner wall of the second valve body cavity, and the positioning convex shaft is disposed on the noise reduction component; Alternatively, the annular protrusion is disposed on the noise reduction component, and the positioning convex shaft is disposed on the inner wall of the second valve body cavity.

[0007] In one embodiment of this application, the noise reduction component includes a valve cage, which is cylindrical, and has a plurality of noise reduction holes arranged at intervals along the circumference and / or axial direction of the valve cage. Along the axial direction of the valve cage, the valve cage has a first end and a second end opposite to each other. The first end of the valve cage is disposed on the valve body and abuts against the valve seat. A valve cage base is disposed on the second end of the valve cage. The positioning structure is located between the valve cage base and the inner wall of the second valve body cavity.

[0008] In one embodiment of this application, the valve cage is a cylindrical double-layer sleeve structure. The valve cage includes an inner noise-reducing sleeve and an outer noise-reducing sleeve sleeved outside the inner noise-reducing sleeve. The noise-reducing holes on the inner noise-reducing sleeve and the outer noise-reducing sleeve are offset along the radial direction of the valve cage.

[0009] In one embodiment of this application, the core assembly includes a valve core body and a valve stem connected to the valve core body. The valve core body is sleeve-shaped, and the valve stem extends axially along the valve core body. A guide structure is provided between the valve core body and the valve body, and the guide structure is used to constrain the movement trajectory of the valve core body.

[0010] In one embodiment of this application, the guide structure includes a guide sleeve disposed on the valve body, and the valve core body slides at least partially along the axial direction of the guide sleeve and passes through the guide sleeve.

[0011] In one embodiment of this application, a pressure-reducing sleeve is provided in the first valve body cavity. The pressure-reducing sleeve is coaxially arranged with the guide sleeve. Along the axial direction of the guide sleeve, the pressure-reducing sleeve is sandwiched between the guide sleeve and the valve seat. A pressure-reducing hole is provided on the pressure-reducing sleeve, and the pressure-reducing hole is used to reduce the pressure of the medium flowing through the pressure-reducing hole.

[0012] In one embodiment of this application, a connecting seat is fixedly provided in the central through hole of the valve core body. The connecting seat is used to connect with the valve stem. The connecting seat is located in the axial middle of the valve core body. The connecting seat divides the valve core body into an upper chamber and a lower chamber along the axial direction of the valve core body. A balance hole is provided on the connecting seat to connect the upper chamber and the lower chamber.

[0013] In one embodiment of this application, the valve body includes a valve body body and a valve cover, a first valve body cavity is formed between the valve cover and the valve body body, and the valve seat is located at the opening of the communicating hole facing the first valve body cavity.

[0014] In one embodiment of this application, a guide hole is provided on the inner wall of the second valve body cavity. The guide hole is used to guide the noise reduction component to a preset position, so that the noise reduction component is positioned and engaged with the inner wall of the second valve body cavity through the positioning structure.

[0015] The beneficial effects of this application are as follows: The regulating valve proposed in this application provides a robust radial physical constraint point for the second end of the noise reduction component by setting a positioning structure between the second end of the noise reduction component and the inner wall of the second valve body cavity. This alters the force model of the noise reduction component within the second valve body cavity to a certain extent, constraining the first and second ends of the noise reduction component and improving the dynamic stability of the noise reduction component's installation structure under vibration. This helps reduce the probability of resonance and severe vibration in the noise reduction component, keeping the overall operating noise within a reasonable range. Simultaneously, it reduces the risk of metal fatigue fracture caused by long-term vibration, significantly improving the operational stability of the regulating valve under extreme conditions and extending the safe service life of the valve's core internal components. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a regulating valve provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a regulating valve body provided in an embodiment of this application; Figure 3 This is a schematic diagram of the valve core body provided in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of a noise reduction component provided in an embodiment of this application; Figure 5 yes Figure 1 Enlarged structural diagram at point A; Figure 6 yes Figure 1 Enlarged structural diagram at point B; Figure 7 yes Figure 1 A magnified structural diagram at point C.

[0018] The reference numerals in the attached drawings are as follows: valve body 1, valve body 101, valve cover 102, first valve body cavity 103, connecting hole 104, second valve body cavity 105, guide hole 106; Guide sleeve 2, limiting protrusion 201; 3 packing gaskets; Packing material 4; 5. Packing gland; Valve stem 6; Anti-rotation sleeve 7, limit groove 701; Pressure reducing sleeve 8; Valve core body 9, annular groove 901, connecting seat 902, balance hole 903, upper part 904, lower part 905, flow opening 906; Valve seat 10; Valve cage 11, inner noise reduction sleeve 1101, outer noise reduction sleeve 1102, noise reduction hole 1103; Valve cage base 12; 13 ring-shaped protrusions; Balance seal ring 14; Key bar 15; 16 fastening nuts; Abrasion-resistant pad 17; 18-pin convex shaft. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present application.

[0022] The following section will first examine the application scenarios of this application to understand the conceptual origin of its technical solution. In industrial fluid automatic control scenarios such as feedwater pump flow recirculation systems in thermal power plants, main steam desuperheating and pressure reduction systems, and high-temperature black water pipeline systems in the coal chemical industry, regulating valves play a crucial role in flow and pressure regulation. These scenarios typically involve large medium pressures and significant inlet and outlet pressure differences. When high-pressure fluid flows through the narrow throttling section inside the regulating valve, the flow velocity increases sharply, and the static pressure drops abruptly, easily triggering strong fluid-induced vibrations and high-decibel noise.

[0023] To address the challenges posed by high differential pressure conditions, regulating valves in related technologies typically employ noise reduction components. The main function of these components is to break down a concentrated and destructive high-speed flow into numerous smaller jets through multi-stage distributed throttling, thereby increasing fluid resistance, dissipating fluid kinetic energy, and achieving the goals of reducing flow velocity, stabilizing pressure reduction, and mitigating turbulent noise. However, long-term engineering practice has revealed that noise reduction components in these technologies are usually only fixed at the upper or middle end, with the lower end suspended within the valve cavity. In a mechanical model, this installation structure is equivalent to a cantilever beam fixed at one end.

[0024] The natural frequency of a cantilever beam structure is relatively low. Under the intense impact of a high-pressure differential medium, the medium generates complex fluid stripping, turbulent shearing, and pressure pulsation on the surface of the noise reduction component. When the excitation frequency of the fluid shedding eddies coincides with the low-order natural frequency of the noise reduction component, it will induce severe structural resonance, which can lead to equipment damage in severe cases. This resonance not only generates high-decibel industrial noise but also causes metal fatigue spalling and even fracture of the noise reduction component and sealing structure. Simultaneously, it induces valve core vibration and surge, seriously threatening the safe operation of the valve. The root cause of these problems lies in the large valve diameter, the lack of fixed constraint at the lower end of the noise reduction component, and the large medium pressure difference. The combination of these three factors results in the noise reduction component being in a cantilevered stress state with a low natural frequency, significantly lowering the threshold for resonance.

[0025] The difficulty in solving the above problems lies in the fact that the internal space of the valve is confined and the medium is in a high-speed flow state. Simply increasing the wall thickness of the noise reduction component to improve rigidity will not only significantly increase material costs and processing difficulty, but also significantly sacrifice the valve's flow capacity. If supporting ribs are added to the outer periphery of the noise reduction component, it will disrupt the flow field within the valve cavity and generate new sources of turbulent noise. In other words, there is an irreconcilable contradiction between "improving structural rigidity" and "maintaining flow capacity and controlling costs," which is why related technologies have long failed to solve this problem at the stress model level.

[0026] The overall structure of the regulating valve provided in the embodiments of this application will be described in detail below with reference to the figures.

[0027] See Figures 1 to 7 The regulating valve provided in this application embodiment includes a valve body 1, a valve seat 10, a valve core assembly, and a noise reduction assembly. The noise reduction assembly is implemented in the form of a valve cage 11, and the valve core assembly includes a valve core body 9 and a valve stem 6.

[0028] like Figure 2 As shown, valve body 1 has an inlet, an outlet, and a medium cavity for the flow of medium, which are connected to the inlet and the outlet, respectively. The medium cavity includes a first valve body cavity 103 and a second valve body cavity 105 connected to the first valve body cavity 103 through a connecting hole 104. The first valve body cavity 103 is connected to the inlet, and the second valve body cavity 105 is connected to the outlet. In a specific example, the medium adopts a high-in, low-out flow path, for example, right-in, left-out. That is, the medium enters the first valve body cavity 103 from the inlet located at a higher position, enters the second valve body cavity 105 located at a lower position after being throttled and depressurized by the connecting hole 104, and then flows out from the outlet.

[0029] See Figure 1The valve seat 10 is disposed on the valve body 1 at the connecting hole 104. In a specific example, the valve seat 10 is fixedly disposed at the orifice of the connecting hole 104 facing the first valve body cavity 103, and a valve seat sealing gasket is provided under the valve seat 10 to ensure static sealing around the connecting hole 104 and prevent internal leakage short circuit of the medium from the mating surface between the valve seat 10 and the valve body 1.

[0030] The valve core assembly is at least partially located within the first valve body cavity 103, and is slidably mounted on the valve seat 10 to control the flow between the first valve body cavity 103 and the second valve body cavity 105. In this embodiment, the valve core body 9 is sleeve-shaped, extending along the connecting hole 104 onto the valve seat 10, and is slidable relative to the valve seat 10. The valve core body 9 has a flow hole for the flow of the medium. The valve stem 6 drives the valve core body 9 to perform reciprocating linear motion, adjusting the cross-sectional area of ​​the flow hole entering the first valve body cavity 103, thereby changing the flow rate through the regulating valve and thus controlling the flow rate and pressure of the medium.

[0031] The noise reduction component is disposed in the second valve body cavity 105 and is used to reduce the noise during medium flow. The noise reduction component has a first end and a second end opposite to each other. The first end of the noise reduction component is located in the connecting hole 104 and abuts against the valve seat 10. A positioning structure is provided between the second end of the noise reduction component and the inner wall of the second valve body cavity 105.

[0032] The contact between the first end of the noise reduction component and the valve seat 10, and the positioning structure between the second end and the inner wall of the second valve body cavity 105, function to support and interact with each other. If only the first end contacts without the positioning of the second end, the noise reduction component will remain in a cantilever state, and its natural frequency cannot be effectively increased. If only the second end positions without the compression of the first end, the noise reduction component will lack axial locking, making it difficult to form stable end-constraint boundaries. Only when both work together can the technical effect of suppressing resonance be achieved.

[0033] In this embodiment, the noise reduction component does not perform the critical flow regulation function. Flow regulation is mainly accomplished by the valve core assembly in conjunction with the upstream throttling structure. The noise reduction component is primarily used for noise reduction and to meet flow capacity requirements. This design, which separates the flow regulation function from the noise reduction flow rate control function, allows the orifice structure of the noise reduction component to be optimized focusing on noise reduction requirements without having to consider the flow characteristic curve. This provides design freedom for the miniaturization and dense arrangement of the noise reduction orifices 1103. This functional separation design is particularly suitable for large-diameter control valves.

[0034] In some embodiments, the positioning structure can be a plug-in fit between the convex shaft 18 and the hole, a nested fit between the boss and the annular groove, or a wedge fit between the conical surface and the conical hole, as long as it can apply radial physical constraints to the second end of the noise reduction component and restrict its radial degrees of freedom. Those skilled in the art will understand that any equivalent fit that can achieve the above-mentioned radial constraint function is within the scope of the concept of this application.

[0035] In some embodiments, the contact between the noise reduction component and the valve seat 10 can be a contact between the annular end face of the first end of the noise reduction component and the plane of the lower end face of the valve seat 10, or a stepped stop can be provided between the two to provide both axial compression and radial preliminary centering. The choice of the above contact method does not affect the formation of the two-end constraint support system.

[0036] See Figure 7 In some embodiments, the positioning structure includes an annular protrusion 13 and a positioning convex shaft 18. The annular protrusion 13 surrounds a central hole, and the positioning convex shaft 18 extends into the central hole of the annular protrusion 13. The annular protrusion 13 is disposed on the inner wall of the second valve body cavity 105, and the positioning convex shaft 18 is disposed on the noise reduction assembly; or, the annular protrusion 13 is disposed on the noise reduction assembly, and the positioning convex shaft 18 is disposed on the inner wall of the second valve body cavity 105.

[0037] In the first embodiment, the annular protrusion 13 is integrally formed or welded onto the bottom wall of the inner cavity of the second valve body cavity 105, and the positioning protrusion 18 is integrally formed or fixedly disposed on the lower surface of the second end of the valve cage 11. During assembly, the positioning protrusion 18 is inserted axially from top to bottom into the central hole of the annular protrusion 13. The outer cylindrical surface of the positioning protrusion 18 and the inner cylindrical surface of the central hole form a clearance fit, which ensures smooth insertion and controls the radial clearance within a small range.

[0038] As an alternative implementation, the annular protrusion 13 is integrally formed or fixedly disposed on the lower surface of the second end of the valve cage 11, while the positioning convex shaft 18 is integrally formed or disposed on the bottom wall of the inner cavity of the second valve body cavity 105. During assembly, the valve cage 11 is inserted downward into the second valve body cavity 105, and the annular protrusion 13 at its lower end is sleeved on the outside of the positioning convex shaft 18 on the bottom wall, thus forming an axial insertion and radial constraint fit. The above two implementations are structurally symmetrical and equivalent in terms of constraint function and technical effect. They can be selected according to the casting process conditions of the bottom of the valve body 1 and the processing convenience of the valve cage 11.

[0039] A positioning structure employing an annular protrusion 13 and a positioning convex shaft 18 is used to control the contact area. In the manufacturing process of large-diameter high-pressure valves, if the second end of the noise reduction component is designed to mate with the bottom wall of the valve body 1 as a large-area planar or cylindrical surface, the accumulated form and position tolerances during casting and machining of the valve body 1 can easily lead to out-of-tolerance issues on the mating surface, causing jamming or misalignment during assembly. Simultaneously, large-area precision machining significantly increases manufacturing costs and processing difficulty. Cost increases are primarily due to increased material usage, while processing difficulty mainly stems from ensuring the accuracy of the fit.

[0040] In this embodiment, the mechanical contact area between the positioning cam 18 and the central hole of the annular protrusion 13 is reduced to a necessary small range through a partial fit, and the contact area should not be too large. While ensuring sufficient radial shear support stiffness, the machining accuracy requirements of the bottom inner cavity of the valve body 1 and the area requiring precision machining are significantly reduced, thereby reducing material consumption and manufacturing time.

[0041] When the high-pressure medium flows within the second valve body cavity 105 and exerts a lateral impact on the valve cage 11, the positioning cam 18 abuts against the sidewall of the central hole of the annular protrusion 13, which can withstand a large lateral fluid impact force and directly transfer the lateral load to the thick-walled shell at the bottom of the valve body 1. This ensures the rigidity of the radial physical constraint at the bottom of the valve cage 11 while avoiding the assembly difficulties and high costs associated with large-area contact fits, achieving a balance between constraint rigidity, processing cost, and assembly smoothness.

[0042] In some embodiments, the end of the positioning cam 18 may also be chamfered or rounded to provide initial insertion capability when inserted into the center hole of the annular protrusion 13, further improving the smoothness of assembly.

[0043] See Figure 4 In some embodiments, the noise reduction component includes a valve cage 11, which is cylindrical and has multiple noise reduction holes. The multiple noise reduction holes are arranged at intervals along the circumference and / or axial direction of the valve cage 11. Along the axial direction of the valve cage 11, the valve cage 11 has a first end and a second end opposite to each other. The first end of the valve cage 11 is located at the connecting hole 104 and abuts against the valve seat 10. A valve cage base 12 is provided on the second end of the valve cage 11, and a positioning structure is located between the valve cage base 12 and the inner wall of the second valve body cavity 105.

[0044] Multiple small-diameter noise reduction holes are provided on the side wall of the valve cage 11. These noise reduction holes can be arranged in a circular array along the circumference of the valve cage 11, or in multiple rows spaced apart along the axial direction of the valve cage 11, or simultaneously arranged in an array along both the circumferential and axial directions. The arrangement of the noise reduction holes can be flexibly selected according to the medium parameters and noise reduction requirements; this application does not impose a unique limitation on this arrangement.

[0045] See Figure 1 The valve cage 11 has an opening at its first end that corresponds to the connecting hole 104, and is installed inside the valve body 1, tightly abutting and pressing against the lower end face of the valve seat 10. A thick-walled, disc-shaped valve cage base 12 is fixedly connected to the second end of the valve cage 11. The valve cage base 12 can be integrally cast or forged with the valve cage 11, or it can be fixedly connected by high-strength welding. The aforementioned positioning structure, such as the positioning cam 18, can be integrally set on the lower end face of the valve cage base 12, so that the entire positioning structure is located between the valve cage base 12 and the inner cavity bottom wall of the second valve body cavity 105.

[0046] The frustum-shaped positioning convex shaft 18 on the valve cage base 12 engages with the annular protrusion 13 at the bottom of the valve body 1, effectively adding a fixing point to the lower end of the valve cage 11. With this fixing point, the valve cage 11 can be extended axially to the bottom of the valve body 1. After this extension, the holes drilled on the valve cage 11 can be smaller and denser, resulting in a more precise division of the throttling window. This further enhances noise reduction while preventing vibration, reducing the probability of vibration after the medium enters the valve cage 11.

[0047] Please see Figure 4 In some embodiments, the valve cage 11 is a cylindrical double-layer sleeve structure. The valve cage 11 includes an inner noise reduction sleeve 1101 and an outer noise reduction sleeve 1102 sleeved outside the inner noise reduction sleeve 1101. The noise reduction holes 1103 on the inner noise reduction sleeve 1101 and the outer noise reduction sleeve 1102 are offset along the radial direction of the valve cage 11.

[0048] Specifically, the inner noise reduction sleeve 1101 has multiple inner noise reduction holes 1103 on its wall surface, and the outer noise reduction sleeve 1102 has multiple outer noise reduction holes 1103 on its wall surface. The inner noise reduction holes 1103 and the outer noise reduction holes 1103 are staggered in their radial projection along the valve cage 11, meaning they are not directly aligned or connected in the radial direction. A small annular gap can be left between the outer wall of the inner noise reduction sleeve 1101 and the inner wall of the outer noise reduction sleeve 1102, or a tortuous throttling channel can be formed between the two sleeves through staggered holes, thus forming a multi-stage stepped pressure reduction mechanism. The medium is first ejected through the inner noise reduction hole 1103, cut into tiny jets, and impacts the inner wall of the outer noise reduction sleeve 1102 for kinetic energy dissipation. Subsequently, the medium undergoes diversion, expansion, and rectification within the gap between the two sleeves. Finally, it is ejected through the outer noise reduction hole 1103, which is radially misaligned with the inner noise reduction hole 1103. This forms a multi-stage pressure reduction path consisting of a first-stage orifice throttling, an intermediate annular cavity expansion and buffering, and a second-stage misaligned orifice throttling, distributing the total pressure drop into two smaller pressure drops, which significantly suppresses the conditions for cavitation cavitation from a physical mechanism perspective.

[0049] Through the aforementioned double-layer staggered flow interception, the high-energy flow stream is cut into numerous tiny jets, kinetic energy is efficiently dissipated, turbulent noise is suppressed, and a good effect of quiet operation and pressure reduction is achieved. At the same time, the double-layer sleeve structure itself also increases the moment of inertia of the valve cage 11, which, together with the aforementioned end-constraint supports, improves the dynamic stability of the noise reduction component from both stiffness and constraint dimensions.

[0050] In some embodiments, the apertures of the inner noise reduction hole 1103 and the outer noise reduction hole 1103 can be the same or different. For example, the aperture of the outer noise reduction hole 1103 can be slightly larger than that of the inner noise reduction hole 1103, so that the medium can gradually expand and release pressure during outward flow. The selection of the above aperture relationship does not affect the tortuous throttling effect brought about by the radial misalignment.

[0051] See Figure 1 and Figure 5 In some embodiments, the valve core assembly includes a valve core body 9 and a valve stem 6 connected to the valve core body 9. The valve core body 9 is sleeve-shaped, and the valve stem 6 extends along the axial direction of the valve core body 9. A guide structure is provided between the valve core body 9 and the valve body 1. The guide structure is used to constrain the movement trajectory of the valve core body 9.

[0052] Specifically, the valve core body 9 is an axially elongated sleeve-shaped cylindrical structure. The valve stem 6 extends upward along the axial centerline of the valve core body 9, passes through the sealing structure at the top of the valve, and is connected to the external actuator. The guide structure forms a high-precision sliding fit with the outer circumferential surface of the valve core body 9 to constrain the axial linear reciprocating motion trajectory of the valve core body 9 within the first valve body cavity 103 and the connecting hole 104, thereby preventing the valve stem 6 from tilting or radially deviating.

[0053] In control valves of related technologies, the valve core is typically short and guided from only one end. Especially under large-diameter, high-pressure differential conditions, the medium flows asymmetrically into the first valve body cavity 103 from the inlet, generating a large unbalanced lateral thrust on the side wall of the valve core. The single-end guiding structure is insufficient to counteract this lateral torque, causing the valve core to tilt and resulting in unilateral interference wear with the valve seat 10 or sleeve, which in turn leads to jamming or even control failure.

[0054] In this embodiment, the valve core body 9 is designed as an axially long sleeve-like structure, and in conjunction with a guide structure, the movement trajectory of the valve core body 9 is constrained. The guide structure can absorb and offset the lateral impact force generated by the medium in real time, ensuring good coaxiality of the valve core body 9 throughout its entire stroke. This not only significantly reduces the probability of valve jamming due to lateral wear, but also helps to reduce surge of the valve core body 9 at the throttling orifice caused by fluid excitation. This ensures the flow capacity of the medium, improves the vibration problem of the valve cage 11 and the valve core body 9, and enhances the flow control accuracy and mechanical reliability of the control valve.

[0055] In some embodiments, along the axial direction of the valve core body 9, the valve core body 9 has an upper portion 904 and a lower portion 905. The upper portion 904 of the valve core body 9 has no opening, and the lower portion 905 of the valve core body 9 has a flow opening 906. When the flow opening in the lower portion 905 of the valve core body 9 is completely located within the second valve body cavity 105, the regulating valve is closed. Figure 1 The diagram shows the closed state of the regulating valve. When the valve stem 6 is lifted, causing at least part of the flow opening 906 of the lower part 905 of the valve core body 9 to enter the first valve body cavity 103, the regulating valve opens, and the flow rate of the medium flowing in the regulating valve increases as the cross-sectional area of ​​the flow opening 906 in the first valve body cavity 103 increases.

[0056] In some embodiments, the guide structure includes a guide sleeve 2 disposed on the valve body 1, and the valve core body 9 slides at least partially along the axial direction of the guide sleeve 2 and passes through the guide sleeve 2.

[0057] Specifically, the guide sleeve 2 is fixedly disposed on the upper part of the valve body 1. For example, the valve body 1 includes a valve body 101 and a valve cover 102. The guide sleeve 2 can be pressed and fixed at the joint between the valve body 1 and the valve cover 102. The guide sleeve 2 can be a thick-walled metal sleeve, and its inner cylindrical surface can be quenched and precision ground to obtain high surface hardness and dimensional accuracy. The valve core body 9 extends upward, and the upper part 904 of the valve core body 9 is at least partially nested in the inner cavity of the guide sleeve 2 along the axial direction, forming a sliding guide fit with the inner wall of the guide sleeve 2; at the same time, the lower part 905 of the valve core body 9 slides along the inner wall of the valve seat 10, thereby creating a large physical distance between the guide sleeve 2 and the valve seat 10 in the axial direction, together forming a double guide structure with the upper part 904 and the lower part 905 of the valve core body 9 respectively.

[0058] The aforementioned dual-guide structure expands the guide span. The resistance of the guide support to overturning moment is closely related to the guide span; the larger the span, the stronger the resistance. In related technologies, the guide surface is concentrated near the valve seat 10, resulting in a smaller span and making the upper end of the valve core prone to lateral swaying. In this embodiment, by introducing an independent guide sleeve 2, the upper part 904 of the valve core body 9 is deeply guided into the inner cavity of the guide sleeve 2, establishing a dual-end, large-span guide system with the top guided by the guide sleeve 2 and the bottom guided by the valve seat 10. This expands the support span of the valve core body 9 several times, significantly improving its resistance to overturning moment.

[0059] Therefore, even under strong turbulent impact, the guide sleeve 2 can stably constrain the movement trajectory of the upper part 904 of the valve core body 9, significantly suppressing the high-frequency lateral jitter and oscillation of the valve core body 9, improving the problem of vibration caused by the valve core body 9 being suspended and subjected to force on one side, and ensuring that the valve can operate smoothly and steadily at both small and large openings. The upper and lower double guides, together with the two-end constraint supports of the aforementioned noise reduction components, jointly suppress the vibration source of the entire valve from the two kinematic pairs of the valve core and valve cage 11.

[0060] In some embodiments, the valve core body 9 is coaxially arranged with the guide sleeve 2, and the lower part 905 of the valve core body 9 can also slide along the inner wall of the valve cage 11 during the sliding process, thereby obtaining additional auxiliary guidance in the lower part of the stroke of the valve core body 9 and further extending the effective guide length.

[0061] like Figure 1 In some embodiments, a pressure-reducing sleeve 8 is provided in the first valve body cavity 103, and the pressure-reducing sleeve 8 is coaxially arranged with the guide sleeve 2. Along the axial direction of the guide sleeve 2, the pressure-reducing sleeve 8 is sandwiched between the guide sleeve 2 and the valve seat 10, and a pressure-reducing hole is provided on the pressure-reducing sleeve 8 to reduce the pressure of the medium flowing through the pressure-reducing hole.

[0062] like Figure 5 As shown, a circumferentially extending limiting protrusion 201 is provided on the outer circumferential surface of the guide sleeve 2 at the end away from the valve seat 10. The limiting protrusion 201 surrounds the guide sleeve 2 and protrudes radially from the outer surface of the guide sleeve 2. The upper end face of the pressure reducing sleeve 8 abuts against the limiting protrusion 201 of the guide sleeve 2, and the lower end face of the pressure reducing sleeve 8 abuts against the upper end face of the valve seat 10. The pressure reducing sleeve 8 is axially clamped by the clamping force transmitted downward from the valve cover 102 through the guide sleeve 2, so that the guide sleeve 2, the pressure reducing sleeve 8 and the valve seat 10 remain coaxial. Moreover, the pressure reducing sleeve 8 is at least partially sleeved on the guide sleeve 2, which reduces the axial size of the regulating valve on the guide sleeve 2 and can, to a certain extent, position the installation position of the pressure reducing sleeve 8. Multiple pressure reducing holes are opened on the circumferential wall of the pressure reducing sleeve 8, and the pressure reducing holes can also be designed in the form of pressure reducing windows. After the high-pressure medium flows into the first valve body cavity 103 through the inlet, it needs to pass through the pressure reducing hole or pressure reducing window on the wall of the pressure reducing sleeve 8 before reaching the throttling area around the valve core body 9. The pressure reducing hole performs pre-stage interception on the medium flowing through it, initially reducing the static pressure and flow velocity of the medium, and buffering the direct impact of the fluid on the valve core body 9.

[0063] The pressure-reducing sleeve 8, valve core body 9, and valve cage 11 together form a progressive multi-stage pressure-reducing system. The medium pressure decreases step by step along the flow path, and the pressure drop at each stage is controlled within a small range. The medium flow velocity at each throttling section is correspondingly reduced, thereby significantly improving the overall service life of the control valve under harsh erosion conditions. At the same time, the upstream pressure reduction reduces the energy of the medium entering the valve cage 11, which also indirectly reduces the fluid excitation intensity borne by the valve cage 11. Combined with the constraint supports at both ends, this further improves the dynamic stability of the noise reduction components.

[0064] In some embodiments, the pressure relief holes on the pressure relief sleeve 8 can be circular through holes or window-shaped flow ports. The pressure relief holes can be arranged in an array along the circumference and axial direction of the pressure relief sleeve 8. The diameter and number of holes can be designed and determined according to the medium parameters and the required pre-stage pressure drop. This application does not impose a unique limitation on the specific shape and arrangement of the pressure relief holes.

[0065] like Figure 3 and Figure 6 As shown, in some embodiments, a connecting seat 902 is fixedly provided in the central through hole of the valve core body 9. The connecting seat 902 is used to connect with the valve stem 6. The connecting seat 902 is located in the axial middle of the valve core body 9. The connecting seat 902 divides the valve core body 9 into an upper chamber and a lower chamber along the axial direction of the valve core body 9. A balance hole 903 is provided on the connecting seat 902 to connect the upper chamber and the lower chamber.

[0066] Specifically, one end of the valve stem 6 extends axially into the central through hole of the valve core body 9, and is axially locked and fixed to the connecting seat 902 by a wear-resistant pad 17 and a fastening nut 16. That is, the fastening nut 16 is screwed onto the threaded section at the lower end of the valve stem 6, pressing the wear-resistant pad 17 and the connecting seat 902 in sequence, thereby achieving a reliable coaxial fixed connection between the valve stem 6 and the valve core body 9. The wear-resistant pad 17 is located between the fastening nut 16 and the connecting seat 902, and is used to distribute the compressive stress and reduce wear on the connection parts during reciprocating motion.

[0067] The connecting seat 902 divides the internal cavity of the valve core body 9 into an upper chamber located above the connecting seat 902 and a lower chamber located below the connecting seat 902 along the axial direction of the valve core body 9. Specifically, on the connecting seat 902, on the outer side of the nut connecting the valve stem 6 and the valve core body 9, an axially penetrating balance hole 903 is provided, directly connecting the upper and lower chambers. An annular groove 901 is provided on the outer wall of the upper part 904 of the valve core body 9, and a balance sealing ring 14 is provided within the annular groove 901. That is, the balance sealing ring 14 on the valve core body 9 is used to seal with the guide sleeve 2, and achieves real-time conduction and dynamic balance of the medium pressure at both ends of the valve core body 9 through the balance hole 903.

[0068] For example, in large-diameter high-pressure differential valves, if the valve core adopts an unbalanced solid structure, the static pressure difference generated between the top and bottom of the valve core by the medium will form a large axial unbalanced force. This unbalanced force is proportional to the product of the pressure difference and the effective pressure-bearing area of ​​the valve core, and can reach tens of tons in large-diameter conditions. This requires a bulky and expensive heavy-duty actuator, and the valve operation is slow.

[0069] In this embodiment, the high-pressure medium flows freely between the upper and lower chambers through the balance hole 903, ensuring that the medium pressure acting on the upper side of the valve core body 9 connecting seat 902 is basically consistent with the medium pressure acting on the lower side in real time. Pressure balance is achieved between the first valve body cavity 103 and the second valve body cavity 105 via the balance hole 903. Simultaneously, the balance sealing ring 14 dynamically seals the annular gap between the outer wall of the valve core body 9 and the inner wall of the guide sleeve 2, preventing medium leakage through this gap and thus preventing disruption of the balance. Furthermore, the connecting seat 902 is located in the axial center of the valve core body 9, optimizing the stress transmission path between the valve stem 6 and the valve core body 9, resulting in better stability of the valve core body 9 during sliding.

[0070] The valve core body 9 is in a basically self-balancing state at the medium static pressure level. When the valve is opened and closed, the actuator only needs to overcome a small frictional resistance and residual unbalanced force, which significantly reduces the requirement for the output thrust of the actuator. This allows a lightweight actuator to achieve smooth and rapid control of a large-diameter high-pressure regulating valve. At the same time, it allows the valve stem 6 and the valve core body 9 to move smoothly up and down in a linear motion, reducing the overall size and cost of the valve.

[0071] In some embodiments, the number of balancing holes 903 can be one or multiple holes spaced apart circumferentially along the connecting seat 902. Multiple balancing holes 903 are beneficial for the uniformity of pressure conduction and response speed. The aperture of the balancing holes 903 can be designed and determined according to the viscosity of the medium and the required pressure response speed.

[0072] like Figure 1 and Figure 2 As shown, in some embodiments, the valve body 1 includes a valve body 101 and a valve cover 102, with a first valve body cavity 103 formed between the valve cover 102 and the valve body 101, and the valve seat 10 is located at the opening of the connecting hole 104 facing the first valve body cavity 103.

[0073] Specifically, the valve cover 102 and the valve body 101 are fixedly connected by high-strength bolts arranged circumferentially. A stop sealing gasket is fitted at the joint between the two, and the valve cover 102 and the valve body 101 together form a closed first valve body cavity 103. The stop sealing gasket can be a flexible graphite gasket that is resistant to high temperature and high pressure. Under the action of bolt pre-tightening force, the stop sealing gasket is fully compressed between the valve cover 102 and the valve body 101, filling the microscopic rough gaps of the joint surface, constructing a tight external sealing barrier, and significantly reducing the risk of high-pressure medium leakage to the outside of the valve.

[0074] A connecting hole 104 is formed in the partition section inside the valve body 101, used to connect the first valve body cavity 103 and the second valve body cavity 105. The valve seat 10 is fixedly mounted on the upper opening of the connecting hole 104 facing the first valve body cavity 103, and a valve seat sealing gasket is placed on the lower end face of the valve seat 10. The bolt tightening force of the valve cover 102 is transmitted through the guide sleeve 2 and the pressure reducing sleeve 8 of the upper part 904, pressing the valve seat 10 and the valve seat sealing gasket tightly against the stepped surface of the opening of the connecting hole 104, achieving a static seal at the valve seat 10.

[0075] The aforementioned split design of the valve body 101 and valve cover 102 provides excellent process convenience for the assembly and subsequent maintenance of the complex internal components of the regulating valve, including the guide sleeve 2, pressure reducing sleeve 8, valve core body 9, valve seat 10, and valve cage 11: after opening the valve cover 102, each internal component can be removed or inserted sequentially along the axial direction without damaging the valve body 101. Simultaneously, positioning the valve seat 10 at the upper opening of the connecting hole 104 facing the first valve body cavity 103 allows the high-pressure medium within the first valve body cavity 103 to exert a downward pressure on the valve seat 10. The greater the medium pressure, the tighter the valve seat sealing gasket is pressed, forming a self-tightening sealing tendency that increases with pressure, further enhancing the static sealing reliability at the valve seat 10.

[0076] It is worth noting that the valve seat 10 performs three functions in this application: firstly, it serves as the sliding guide surface of the lower part 905 of the valve core body 9, forming a lower guide for dual upper and lower guidance; secondly, it serves as the axial pressing bearing surface of the first end of the valve cage 11, forming an upper constraint for dual-end constraint support; and thirdly, it serves as the throttling and sealing reference at the connecting hole 104. This multi-functional integrated design of the valve seat 10 allows the dual-end constraint support and the dual upper and lower guide to share the same high-rigidity reference component, reducing the number of parts and tolerance accumulation links, and improving the coaxial accuracy of the entire valve internal system.

[0077] In some embodiments, a guide hole 106 is provided on the inner wall of the second valve body cavity 105. The guide hole 106 is used to guide the noise reduction component to a preset position so that the noise reduction component is positioned and engaged with the inner wall of the second valve body cavity 105 through the positioning structure.

[0078] Specifically, the guide hole 106 can be opened on the inner wall of the bottom of the second valve body cavity 105. The guide hole 106 can be tapered or beveled, that is, the upper diameter of the guide hole 106 is larger than the lower positioning structure of the noise reduction component, such as the outer diameter of the positioning cam 18. The inner wall of the guide hole 106 gradually converges from top to bottom and transitions to the positioning hole diameter that matches the positioning cam 18.

[0079] During the assembly of the control valve, the valve cage 11 needs to be inserted into the depth of the second valve body cavity 105 from the top opening of the valve body 1. The operator cannot directly see the positioning and mating parts at the bottom of the second valve body cavity 105, which is a typical blind assembly situation. Without a guiding structure, the positioning cam 18 is very likely to have a hard collision with the bottom mating hole, resulting in end blunting, deformation, or even assembly jamming.

[0080] In this embodiment, when there is a slight axial eccentricity during the fall of the valve cage 11, after the valve cage 11 contacts the tapered inclined surface of the guide hole 106, under the combined action of the valve cage 11's own weight and the lateral component force of the inclined surface, the positioning convex shaft 18 automatically slides and corrects itself along the inclined surface, gradually correcting towards the center position, and finally smoothly slides into the preset center mating position, realizing a non-blocking positioning fit between the noise reduction component and the inner wall of the second valve body cavity 105.

[0081] Therefore, the guide hole 106 provides progressive physical guidance to the noise reduction components during blind assembly, significantly improving the success rate of blind assembly alignment, reducing the risk of damage to the positioning mating surfaces caused by forced hammering, and shortening the on-site maintenance and assembly time for large valves. It is understandable that the guide hole 106 and the aforementioned positioning structure are functionally interconnected: the guide hole 106 is responsible for dynamic guidance and alignment during assembly, while the positioning structure is responsible for static radial constraint after assembly. Together, they ensure the reliable establishment of the constraint support system at both ends.

[0082] In some embodiments, in addition to the tapered guide hole, a larger guide radius can be machined on the upper opening of the central hole of the annular protrusion 13, or a guide cone can be machined on the head of the positioning cam 18. This can also achieve the progressive guidance function in the blind assembly process. The above-mentioned guidance forms can be used individually or in combination.

[0083] See Figure 1 and Figure 5In some embodiments, an anti-rotation sleeve 7 is provided on the valve body 1, and a key 15 is provided on the upper part 904 of the valve stem 6. The valve stem 6 is at least partially inserted into the anti-rotation sleeve 7. A limiting groove 701 extending axially along the inner wall of the anti-rotation sleeve 7 is provided. The key 15 is slidably disposed in the limiting groove 701 along the axial direction of the anti-rotation sleeve 7 to prevent the valve stem 6 from rotating circumferentially. The valve stem 6 performs axial linear reciprocating motion under the drive of the actuator. If the valve stem 6 undergoes circumferential torsion during the motion, the torsional stress and axial stress are superimposed, which can easily lead to the breakage of the valve stem 6 and may cause the valve core body 9 to deflect, thereby damaging the sealing fit. The key 15 cooperates with the limiting groove 701 of the anti-rotation sleeve 7 to restrict the circumferential degree of freedom of the valve stem 6, ensuring that the valve stem 6 only performs axial linear displacement, thereby preventing the valve stem 6 from breaking due to torsion and ensuring the stability of the linear reciprocating motion of the valve stem 6.

[0084] In some embodiments, a valve stem 6 is axially disposed through the upper part 904 of the valve cover 102. A packing washer 3, packing 4, and a packing gland 5 are sequentially assembled from bottom to top within the packing gland 4 of the valve cover 102 and tightened by screws. The packing washer 3 is supported at the bottom of the packing gland 4. The packing 4 is axially compressed between the packing gland 5 and the packing washer 3, resulting in radial expansion that tightly fits the outer cylindrical surface of the valve stem 6 against the inner wall of the packing gland 4. This achieves an external seal for the valve stem 6 during dynamic axial displacement, preventing high-pressure media from leaking outwards along the gap between the valve stem 6 and the valve cover 102.

[0085] The anti-rotation constraint of the key bar 15 and the sealing system of the packing 4 work together functionally: the valve stem 6 maintains pure axial linear motion, so that there is only axial sliding friction between the packing 4 and the valve stem 6 and no circumferential rubbing friction, which slows down the wear rate of the packing 4, extends the maintenance cycle of the dynamic sealing system, and ensures the long-term reliability of the dynamic axial seal.

[0086] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A regulating valve, characterized in that, include: A valve body having an inlet, an outlet, and a medium cavity for flowing medium, the medium cavity being connected to the inlet and the outlet respectively, the medium cavity including a first valve body cavity and a second valve body cavity connected to the first valve body cavity through a connecting hole, the first valve body cavity being connected to the inlet, and the second valve body cavity being connected to the outlet; A valve seat is disposed on the valve body at the communicating hole; A valve core assembly, at least partially located within the first valve body cavity, is slidably disposed on the valve seat to control the opening and closing of the connection between the first valve body cavity and the second valve body cavity; A noise reduction component is disposed in the second valve body cavity. The noise reduction component is used to reduce the noise when the medium flows. The noise reduction component has a first end and a second end opposite to each other. The first end of the noise reduction component is located in the connecting hole and abuts against the valve seat. A positioning structure is provided between the second end of the noise reduction component and the inner wall of the second valve body cavity.

2. The regulating valve according to claim 1, characterized in that: The positioning structure includes an annular protrusion and a positioning convex shaft. The annular protrusion surrounds a central hole, and the positioning convex shaft extends into the central hole of the annular protrusion. The annular protrusion is disposed on the inner wall of the second valve body cavity, and the positioning convex shaft is disposed on the noise reduction component; Alternatively, the annular protrusion is disposed on the noise reduction component, and the positioning convex shaft is disposed on the inner wall of the second valve body cavity.

3. The regulating valve according to claim 1, characterized in that: The noise reduction component includes a cylindrical valve cage with multiple noise reduction holes spaced apart along the circumference and / or axial direction of the valve cage. Along the axial direction of the valve cage, the valve cage has a first end and a second end opposite to each other. The first end of the valve cage is disposed on the valve body and abuts against the valve seat. A valve cage base is disposed on the second end of the valve cage. The positioning structure is located between the valve cage base and the inner wall of the second valve body cavity.

4. The regulating valve according to claim 3, characterized in that: The valve cage is a cylindrical double-layer sleeve structure. The valve cage includes an inner noise reduction sleeve and an outer noise reduction sleeve sleeved outside the inner noise reduction sleeve. The noise reduction holes on the inner noise reduction sleeve and the outer noise reduction sleeve are offset along the radial direction of the valve cage.

5. The regulating valve according to claim 1, characterized in that: The valve core assembly includes a valve core body and a valve stem connected to the valve core body. The valve core body is sleeve-shaped, and the valve stem extends along the axial direction of the valve core body. A guide structure is provided between the valve core body and the valve body, and the guide structure is used to constrain the movement trajectory of the valve core body.

6. The regulating valve according to claim 5, characterized in that: The guide structure includes a guide sleeve disposed on the valve body, and the valve core body slides at least partially along the axial direction of the guide sleeve and passes through the guide sleeve.

7. The regulating valve according to claim 6, characterized in that: A pressure-reducing sleeve is provided in the first valve body cavity. The pressure-reducing sleeve is coaxially arranged with the guide sleeve. Along the axial direction of the guide sleeve, the pressure-reducing sleeve is sandwiched between the guide sleeve and the valve seat. A pressure-reducing hole is provided on the pressure-reducing sleeve. The pressure-reducing hole is used to reduce the pressure of the medium flowing through the pressure-reducing hole.

8. The regulating valve according to claim 5, characterized in that: A connecting seat is fixedly installed in the central through hole of the valve core body. The connecting seat is used to connect with the valve stem. The connecting seat is located in the axial middle of the valve core body. The connecting seat divides the valve core body into an upper chamber and a lower chamber along the axial direction of the valve core body. A balance hole is opened on the connecting seat to connect the upper chamber and the lower chamber.

9. The regulating valve according to any one of claims 1-8, characterized in that: The valve body includes a valve body body and a valve cover, with the valve cover and the valve body body forming the first valve body cavity, and the valve seat located at the opening of the communicating hole facing the first valve body cavity.

10. The regulating valve according to any one of claims 1-8, characterized in that: A guide hole is provided on the inner wall of the second valve body cavity. The guide hole is used to guide the noise reduction component to a preset position so that the noise reduction component is positioned and engaged with the inner wall of the second valve body cavity through the positioning structure.

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