Multi-stage throttling fine adjustment valve
By setting multiple throttling orifices or throttling plates inside the valve, combined with positioning and indicating devices, the problems of insufficient flow regulation accuracy and poor linearity of traditional valves are solved, achieving precise flow control and improved reliability, and is suitable for industrial fields such as petrochemicals and pharmaceuticals.
Patent Information
- Application Number
- CN202422898239.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Traditional valves suffer from insufficient precision and poor linearity in flow regulation, making it difficult to meet the precise flow control requirements of complex industrial processes. Furthermore, existing improvement solutions suffer from high costs, low reliability, or poor environmental adaptability.
A multi-stage throttling fine-tuning valve is designed. By setting multiple throttling orifices or throttling plates inside the valve, the movement of the valve core changes the fluid path and throttling combination, thereby achieving fine flow regulation. Combined with positioning and indicating devices, the accuracy and reliability of flow control are ensured.
It enables precise regulation within a range of small and large flow rates, improving the reliability and stability of the valve, reducing manufacturing costs and maintenance frequency, and adapting to complex industrial environments.
Smart Images
Figure CN223662628U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to valve technical field especially relates to a multistage throttling fine adjustment valve. BACKGROUND
[0002] In today's industrial field, especially in petroleum chemical industry, pharmaceutical industry, fine chemical industry and fluid conveying system and many other industries, the precision of flow control plays a crucial role in the stability of production process, product quality and energy utilization efficiency. With the continuous improvement of industrial automation and the increasing refinement of production process, the requirement for valve flow regulation performance is becoming more and more stringent.
[0003] Traditional valves have many limitations in flow regulation. For example, the flow regulation range of ordinary single-stage throttling valve is relatively narrow, and it is difficult to achieve accurate control when regulating small flow, and the regulation precision is insufficient. This is because the single-stage throttling structure can only provide limited throttling resistance change, which cannot meet the precise regulation and control demand of small flow change in complex process. Moreover, the linearity of flow control of such valves is poor at different opening degrees, that is, with the change of valve opening degree, the change of flow is not an ideal linear relationship, but there may be a large deviation. This will lead to the difficulty in accurately controlling the valve opening degree according to the set flow parameter in actual production, which is easy to cause flow fluctuation, and then affect the stability of product quality. For example, in the pharmaceutical industry, the precision of raw material flow in drug synthesis process is extremely high, and small flow deviation may lead to imbalance of drug ingredient proportion, affect drug efficacy and even cause safety hazard; in the rectification process of petroleum chemical industry, unstable flow will destroy the material balance and energy balance in the tower, reduce the separation efficiency, increase the energy consumption and production cost.
[0004] In order to solve the problems of low flow regulation precision and poor linearity of traditional valves, researchers have also proposed some improvement schemes. Some valves adopt multi-stage valve core structure, trying to expand the flow regulation range and improve the linearity through the cooperation of multiple valve cores. However, this structure is often complex, which not only increases the manufacturing cost of valve, but also due to the high cooperation precision requirement between multiple valve cores, it is easy to cause problems such as jamming, uneven wear in actual use, which reduces the reliability and service life of valve. In addition, some electronic flow regulation devices are combined with traditional valves, which realize accurate control of flow by means of sensor and controller. But this scheme has the problems of high cost, high requirement for use environment and electronic equipment susceptible to electromagnetic interference, which limits its wide application in some complex industrial environments. UTILITY MODEL CONTENTS
[0005] In order to solve the problems presented in the background art, the utility model provides a multistage throttling fine tuning valve, the utility model discloses utilize the throttling characteristics of each throttling hole or throttling sheet, through setting up multiple throttling holes or throttling sheets in the valve, and utilizing different combination modes thereof, realize extremely fine flow regulation range.
[0006] In order to solve the above technical problems, the utility model provides technical scheme as follows:
[0007] A multistage throttling fine tuning valve, including valve body, valve rod, valve core, multistage throttling system, sealing structure, positioning device, indicating device, valve seat.
[0008] Preferably, the fluid inlet and outlet of the valve body are provided with connecting flanges or threaded interfaces, the connecting flanges are uniformly provided with bolt holes for connecting with the pipeline system, and flow guide structures including flow guide vanes or gradually expanding / contracting flow channel shapes are arranged near the fluid inlet and outlet to enable the fluid to smoothly enter and exit the valve body.
[0009] Preferably, the valve body is provided with a valve rod mounting hole at the top, one end of the valve rod extends to the outside of the valve body through the valve rod mounting hole and is fixedly connected with an external power device, and the other end is connected with the valve core through a fastening connection mode including threaded connection and pin connection, so as to ensure that the valve rod can stably drive the valve core to move in position in the valve body, thereby controlling the opening degree and flow of the valve, and the valve rod and the valve core cannot relatively displace or loosen during movement, and a sealing structure is arranged between the valve rod and the valve body.
[0010] Preferably, the valve core is located in the fluid passage inside the valve body, and the valve core moves up and down or in other directions under the driving of the valve rod, so as to change the flow path and throttling condition of the fluid in the valve body through the movement of the valve core.
[0011] Preferably, the multistage throttling system is composed of throttling sheets and throttling holes, the throttling holes are directly arranged on the valve core and are integrated with the valve core, the throttling sheets are fixedly installed on the flow passage wall inside the valve body or specific fixed supports in a position corresponding to the valve core through welding, bolt connection or clamping groove embedding, so as to change the contact combination of the fluid and the throttling holes and the throttling sheets during the movement of the valve core; the throttling holes adjust the fluid flow by changing the hole diameter and the combination with other throttling holes, and the throttling sheets adjust the fluid flow by the specific shape, area and position in the valve body in cooperation with the valve core to generate throttling resistance on the fluid, thereby realizing fine adjustment of the flow.
[0012] Preferably, the distribution mode of the throttling holes includes axial arrangement, circumferential distribution or other specific arrangement modes, the throttling holes are circular or other shape through holes on the valve core, and the hole diameters change from minimum to maximum or are designed according to specific flow regulation rules.
[0013] Preferably, the shape of the throttle plate includes a circle, a rectangle or a streamline, the thickness and area of which are determined according to the required throttling resistance and flow adjustment characteristics, and the surface is polished to reduce fluid friction resistance.
[0014] Preferably, the sealing structure includes an O-shaped sealing ring, a sealing gasket, which is distributed at the connection between the valve body and the valve stem, the mating surface of the valve core and the valve body, and other parts that may have a risk of fluid leakage.
[0015] Preferably, the positioning device is installed inside the valve body and interacts with the valve core, and the connection mode of the positioning device and the valve core includes a clearance fit between the limiting pin and the limiting groove on the valve core, allowing the valve core to move within a limited range, ensuring that the valve core can accurately correspond to the corresponding flow adjustment state at each opening position, thereby ensuring the accuracy and repeatability of flow control.
[0016] Preferably, the indicating device is fixed outside the valve body and has a linkage relationship with the valve stem or the valve core, and directly displays the opening state of the valve, so that the operator can timely understand the working condition of the valve, and the indicating device includes an opening pointer and a scale disc, the opening pointer and the valve stem or the valve core are linked in a mode including key connection or pin connection, and the scale disc is fixed outside the valve body by welding or bolt connection.
[0017] Preferably, the valve seat is installed inside the valve body at a position corresponding to the valve core, and the valve seat and the valve body are connected in a mode including interference fit or bolt connection, to ensure stable installation inside the valve body and good cooperation with the sealing surface of the valve core, thereby realizing the functions of sealing and throttling.
[0018] Compared with the prior art, the utility model has the beneficial effects that:
[0019] 1. The utility model discloses a multi-stage throttling design, a plurality of throttling holes or throttling plates are arranged in the valve, the diameters or throttling areas of these throttling elements are different, and are distributed at specific positions in the valve core or the valve body. By moving the valve core, fluid can pass through different combinations of throttling holes or throttling plates in sequence, thereby achieving fine flow regulation. Whether it is precise control of small flow or accurate adjustment in a large flow range, it can be easily realized, effectively making up for the defects of traditional valves in small flow regulation, and providing reliable protection for industrial production processes with strict flow control requirements.
[0020] 2.The structure of the utility model is more simple, the existing multistage valve core structure often causes the assembly difficulty to be big because of many valve core quantity, the complex cooperation relation, and the long -term operation process is easy to appear the fault such as jam, uneven wear, reduce the reliability and service life of valve.And the multistage throttling fine adjustment valve only sets throttling hole or throttling sheet in the valve core or valve body, and utilizes the synergistic effect of its and valve core movement to realize flow regulation, reduces the complex mechanical structure and moving parts, not only reduces the manufacturing cost, but also improves the overall reliability and stability of the valve, reduces the frequency and cost of maintenance. BRIEF DESCRIPTION OF DRAWINGS
[0021] Fig. 1 is the sectional view structure schematic diagram of the utility model;
[0022] Fig. 2 is the ball body fluid flow surface throttling hole schematic diagram of the utility model.
[0023] 1, valve body;2, valve stem;3, valve core;4, multistage throttling system;5, sealing structure;6, positioning device;7, indicating device;8, valve seat;9, hand wheel;41, throttling hole;42, throttling sheet;51, packing box;52, packing gland;53, graphite packing;54, gasket;61, opening pointer;62, dial. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.
[0025] As Figs. 1-2 shown, the valve of the utility model embodiment includes valve body 1, valve stem 2, valve core 3, multistage throttling system 4, sealing structure 5, positioning device 6, indicating device 7 and valve seat 8.
[0026] Specifically, the valve body 1 of the embodiment is spherical, the two sides of the valve body 1 are provided with fluid inlet and outlet, the fluid inlet is provided with tapered flow channel shape, the starting diameter is slightly larger than the diameter of the connected pipeline, then gradually reduces to the diameter of the internal flow channel connection place of the valve body 1 along the fluid flow direction. The fluid outlet is provided with gradually expanding flow channel shape, the gradually expanding flow channel starts from the internal flow channel outlet of the valve body 1, and the diameter gradually increases to be slightly larger than the diameter of the connected pipeline.
[0027] Specifically, the fluid inlet and outlet of the valve body 1 are provided with standard threaded interfaces, and the diameter of the threaded interfaces is strictly designed according to the relevant industrial standards.
[0028] Specifically, at the top of the valve body 1, a valve stem 2 mounting hole is provided, the valve stem 2 top extends to the outside after passing through the valve body 1 mounting hole, and a standard square connector is processed, which perfectly matches the hand wheel 9 to achieve reliable connection. The valve stem 2 and the valve body 1 top mounting hole adopt a packing gland sealing structure 5. The packing gland is composed of a packing box 51, a packing gland 52 and graphite packing 53. The packing box 51 is firmly fixed on the valve body 1 by welding process, and has a specific annular space inside, the valve stem 2 passes through the space. The graphite packing 53 is carefully cut into the appropriate shape and size and filled in the annular space around the valve stem 2 in the packing box 51, and the packing gland 52 is connected to the packing box 51 by means of a plurality of high-strength bolts. During installation, by tightening the bolts step by step, the packing gland 52 applies uniform and appropriate compression force to the graphite packing 53, prompting the graphite packing 53 to tightly fit the surface of the valve stem 2.
[0029] Specifically, the valve core 3 of the embodiment is a spherical part. A plurality of throttle holes 41 of different diameters are distributed radially and axially on the fluid flow surface of the sphere. The diameters of these throttle holes 41 vary from 1mm to 5mm, and are arranged according to a specific mathematical model and flow regulation requirements. In this embodiment, the area close to the central axis of the sphere has larger diameter throttle holes 41 and sparse distribution, while as it approaches the edge of the sphere, the diameter of the throttle holes 41 gradually decreases and the distribution density increases accordingly.
[0030] Specifically, a plurality of throttle plates 42 are installed on the flow passage wall inside the valve body 1. The throttle plates 42 are made of high-quality ceramic material, the shape of the throttle plates 42 is circular, the thickness is accurately controlled to be 2mm, and they are fixed in a specific position on the flow passage wall by a clamping groove and correspond to the throttle holes 41 on the sphere. The size of the clamping groove and the outer diameter of the throttle plate 42 adopt a tight interference fit. When the sphere rotates, the fluid can pass through the throttle holes 41 on the sphere and the throttle plates 42 on the flow passage wall in turn, and the two cooperate with each other to achieve multi-stage throttling through different combination modes. For example, when small flow regulation is required, the fluid mainly passes through the narrow channel formed by the small-diameter throttle holes 41 on the sphere and the throttle plates 42 at a specific position on the flow passage wall, generating a large throttling resistance, thereby accurately controlling the small flow; while in the large flow demand, as the sphere rotates, more throttle holes 41 and throttle plates 42 are combined to participate in fluid flow, the flow area is greatly increased to meet the delivery requirements of larger flow.
[0031] Specifically, the valve seat 8 is installed at the key position inside the valve body 1 in contact with the ball. The sealing surface of the valve seat 8 is finely ground, and the ball surface is sealed by the sealing gasket 54. When the valve is in the closed state, the ball is tightly pressed against the valve seat 8 by the sealing gasket 54 under the drive of the valve stem 2, and the contact pressure between the two is evenly distributed, forming a reliable sealing interface.
[0032] Specifically, the positioning device 6 adopts a mechanical limiting structure. Limiting pins are installed at the upper and lower ends inside the valve body 1, and the limiting pins are firmly fixed on the valve body 1 by threaded connection. The upper and lower ends of the ball of the valve core 3 are correspondingly provided with limiting grooves, and when the ball rotates to the maximum or minimum opening position, the limiting pins will accurately enter the limiting grooves to prevent further rotation of the ball, thereby accurately limiting the displacement range of the valve core 3.
[0033] Specifically, the indicating device 7 is composed of an opening pointer 61 and a scale disc 62. The opening pointer 61 is made of lightweight aluminum alloy and is fixed on the valve stem 2 at the top of the valve body 1. The scale disc 62 is made of stainless steel and has scales from 0 degrees to 90 degrees marked on the surface, corresponding to the positions of the valve from full closing to full opening, and the accuracy of the scales reaches ±1 degree. The scale disc 62 is installed on the top of the valve body 1 near the pointer by welding process, and its installation angle is accurately calibrated to ensure the accuracy of the pointer and the scale. When the valve stem 2 rotates, the opening pointer 61 rotates with it, and the operator can intuitively understand the opening of the valve by observing the position of the pointer on the scale disc 62, thereby conveniently controlling the operation according to the process requirements.
[0034] The working principle of the embodiment is as follows:
[0035] When the valve is in the initial closed state, the through hole of the ball of the valve core 3 is perpendicular to the flow channel of the valve body 1, the fluid inlet and outlet are completely blocked by the ball, and the fluid cannot flow in the valve body 1. When it is necessary to open the valve to adjust the flow, the operator rotates the valve stem 2 by applying a suitable torque through the hand wheel 9, and the valve stem 2 stably transmits the torque to the ball of the valve core 3, so that the ball starts to rotate in the valve body 1. With the rotation of the ball, the fluid first contacts the smaller diameter throttling hole 41 on the ball, at this time, due to the restriction of the throttling hole 41, the flow area of the fluid is small, the flow rate is high, the pressure is low, and the flow is small, realizing preliminary throttling and flow control. With the continuous rotation of the ball, more throttling holes 41 participate in the flow path of the fluid, and the fluid begins to interact with the throttling piece 42 on the flow channel wall, the flow area gradually increases, the flow rate gradually decreases, the pressure gradually recovers, and the flow gradually increases. During the entire flow adjustment process, due to the distribution of the throttling holes 41 of different diameters on the ball and the combination with the throttling piece 42, and the accurate control of the opening degree of the ball by the positioning device 6, the flow can change according to the expected linear relationship at different opening degrees of the valve, thereby realizing fine flow adjustment and good flow control linearity.
[0036] It should be noted that, in the description of the embodiments of the present application, the terms indicating the orientation or position relationship appearing in the description of the embodiments of the present application, such as "upper", "lower", "left", "right", "center", "inner", "outer", etc., are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / device / apparatus of the present application is usually used. These terms of orientation or position relationship are only for the convenience of describing the present application or simplifying the description in the embodiments, and for the convenience of the skilled person to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation or be constructed and operated in a specific position relationship, so it cannot be understood as a limitation on the present application.
[0037] In addition, in the description of the embodiments of the present application, "several", "a plurality of", "several" represent at least 2. It can be 3, 4, 5, 6, 7, 8, 9, etc. in any case, or even more than 9.
[0038] In addition, in the description of the technical scheme of the present application, unless otherwise specified / limited / limited, the terms "provided", "installed", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, which can be welding, riveting, bolting, screwing, etc. The connection means commonly used in the art. The connection can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication between two elements.
[0039] For those skilled in the art, in the understanding of the scheme described in the specific embodiments of the present application, reference can be made to the conventional technical manuals in the art, and at the same time, for the places where professional terms appear, reference can be made to the appropriate understanding or adjustment, and the same or similar technical scheme implementation conditions are derived without paying creative labor.
Claims
1. A multi-stage throttling fine-tuning valve, characterized in that, The valve body (1) includes a valve body (1), a valve stem (2), a valve core (3), a multi-stage throttling system (4), a sealing structure (5), a positioning device (6), an indicating device (7), and a valve seat (8). The valve body (1) has a valve stem (2) mounting hole at the top. The upper end of the valve stem (2) passes through the valve stem (2) mounting hole and extends to the outside of the valve body (1) to connect with an external power device. The other end is connected to the valve core (3). A sealing structure (5) is provided between the valve stem (2) and the valve body (1). The multi-stage throttling system (4) includes a valve body (1), a valve stem (2), a valve core (3), a multi-stage throttling system (4), a sealing structure (5), a positioning device (6), an indicating device (7), and a valve seat (8). The throttling system (4) consists of a throttling plate (42) and a throttling orifice (41). The throttling orifice (41) is located on the valve core (3), and the throttling plate (42) is installed on the flow channel wall inside the valve body (1). The positioning device (6) is installed inside the valve body (1) and connected to the valve core (3). The indicating device (7) is installed outside the valve body (1) and linked with the valve stem (2) or the valve core (3). The valve seat (8) is installed inside the valve body (1) at a position corresponding to the valve core (3).
2. The multi-stage throttling fine-tuning valve according to claim 1, characterized in that, The valve body (1) is provided with connecting flanges or threaded interfaces at the fluid inlet and outlet. The connecting flanges have evenly distributed bolt holes for connecting to the pipeline system. A flow guiding structure is provided near the fluid inlet and outlet, including flow guide vanes or gradually expanding / contracting flow channel shapes, so that the fluid can smoothly enter and exit the valve body (1).
3. The multi-stage throttling fine-tuning valve according to claim 1, characterized in that, The valve core (3) is located in the fluid channel inside the valve body (1), and the valve core (3) moves under the drive of the valve stem (2).
4. The multi-stage throttling fine-tuning valve according to claim 1, characterized in that, The distribution of the throttling orifice (41) includes axial arrangement and circumferential distribution. The throttling orifice (41) is circular on the valve core (3), and the orifice size changes from the smallest to the largest according to the flow regulation requirements or is designed according to the flow regulation law.
5. A multi-stage throttling fine-tuning valve according to claim 1, characterized in that, The shape of the throttling vane (42) includes circular, rectangular or streamlined, and its thickness and area are determined according to the required throttling resistance and flow regulation characteristics, and its surface is polished to reduce fluid friction resistance.
6. A multi-stage throttling fine-tuning valve according to claim 1, characterized in that, The sealing structure (5) is distributed at the connection between the valve body (1) and the valve stem (2), the mating surface between the valve core (3) and the valve body (1), and the parts where there is a risk of fluid leakage. The sealing structure (5) includes a sealing gasket (54), an O-ring, and a stuffing box.
7. A multi-stage throttling fine-tuning valve according to claim 1, characterized in that, The connection between the positioning device (6) and the valve core (3) includes a clearance fit between the limiting pin and the limiting groove on the valve core (3), allowing the valve core (3) to move within a limited range.
8. A multi-stage throttling fine-tuning valve according to claim 1, characterized in that, The indicating device (7) includes an opening pointer (61) and a scale (62). The opening pointer is linked with the valve stem (2) or valve core (3) by means of key connection or pin connection. The scale (62) is fixed to the outside of the valve body (1) by welding or bolt connection.
9. A multi-stage throttling fine-tuning valve according to claim 1, characterized in that, The valve seat (8) and the valve body (1) are connected by either an interference fit or bolts.