Small-flow precision regulating valve

Abstract

The utility model provides a small-flow precision regulating valve, which relates to the technical field of regulating valves and comprises a valve body, a valve core positioned in the valve body and a valve rod used for driving the valve core to rotate, and a fan-shaped hole is horizontally formed in the center of one side of the valve core towards the liquid inlet direction of the valve body. A cylindrical cavity is formed in the center of the side, facing the liquid outlet direction of the valve body, of the valve element and communicates with the fan-shaped hole. According to the regulating valve disclosed by the utility model, the valve core is provided with the horizontal fan-shaped hole and the cylindrical cavity, so that accurate small-flow regulation can be realized. Fine flow control is provided by the fan-shaped hole, the flow is adjusted by adjusting the size of the opening, the larger cavity of the cylindrical cavity effectively reduces the flowing resistance of fluid and improves the flowing speed of the fluid, and meanwhile, the arrangement of the cylindrical cavity can avoid accumulation of sediments, so that the stability of flow control and the anti-blocking capacity of the valve are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to a small-flow precision regulating valve. Background Art

[0002] At present, in the field of fluid control, small-flow precision regulating devices mainly include metering pumps, linear stroke regulating valves and angular stroke regulating valves. These devices have their own advantages and disadvantages in specific application scenarios, but there are also some technical limitations:

[0003] The metering pump can control the flow rate relatively accurately, especially suitable for small-flow control. By selecting different models, the flow accuracy can be controlled within a small range. However, the disadvantages of the metering pump are that it has many peripheral accessories, complex maintenance, relatively large noise during operation, and a narrow adjustment ratio range. In addition, since it relies on volumetric control of the flow rate, it is difficult to achieve linear flow control, which limits its application in some high-precision occasions.

[0004] The advantage of the linear stroke regulating valve is that the repeatability error is small and it can provide relatively stable flow control. However, when used for micro-flow control, due to the limited stroke, a needle-shaped piston structure is usually adopted, resulting in a very small adjustable ratio. The control accuracy is generally only about 50:1, and it is difficult to meet the high-precision flow regulation requirements.

[0005] Compared with the linear stroke regulating valve, the angular stroke regulating valve can provide a higher adjustable ratio and relatively high control accuracy. The V-type regulating ball valve is the most common type of angular stroke regulating valve, and usually adjusts the flow rate by changing the flow area between the V-shaped groove on the valve core and the annular valve seat. The patent with the publication number of CN208703135U discloses a V-shaped groove micro-flow regulating valve, which has a V-shaped groove on the valve core surface, so that the flow area of the fluid changes linearly from the inlet to the outlet, with relatively high flow regulation accuracy and a large adjustable ratio.

[0006] Although the V-type regulating ball valve performs well in small-flow regulation, there are still some problems in specific application scenarios. First, the fluid flows through the channel between the V-shaped groove and the valve seat, and the flow path of the fluid is relatively long, with a large flow resistance, which will lead to a low flow velocity and a slow dynamic response of fluid control. Second, when dealing with fluids containing particles or sediments, due to the long flow path of the fluid, the particles and sediments are easy to accumulate in the channel, which will affect the regulation accuracy and may even cause the valve to block. Especially when the flow rate is small, these problems are more obvious, reducing the reliability and control accuracy of the system. Content of the Utility Model

[0007] In view of this, the present utility model provides a small-flow precision regulating valve to solve the problems of reduced flow velocity, limited regulating accuracy, and easy blockage of fluids containing particles or crystal deposits in the existing V-type regulating ball valve.

[0008] The technical solution of the present utility model is realized as follows:

[0009] The present utility model provides a small-flow precision regulating valve, which includes a valve body, a valve core located inside the valve body, and a valve rod for driving the valve core to rotate. A sector-shaped hole is horizontally opened at the center of one side of the valve core facing the liquid inlet direction of the valve body, and a cylindrical cavity is opened at the center of one side of the valve core facing the liquid outlet direction of the valve body. The cylindrical cavity is communicated with the sector-shaped hole.

[0010] On the basis of the above technical solution, preferably, an installation cavity is provided at the central axis of the valve body for installing the valve core. A liquid inlet hole is coaxially opened at the liquid inlet end of the valve body, and a plugging member is detachably arranged at the liquid outlet end of the valve body for restricting the valve core in the installation cavity. A liquid outlet hole communicated with the installation cavity and the liquid inlet hole is coaxially opened on the plugging member.

[0011] On the basis of the above technical solution, preferably, the length of the sector-shaped hole is adapted to the inner diameter of the liquid inlet hole of the valve body.

[0012] Furthermore, preferably, the inner diameter of the cylindrical cavity is adapted to the inner diameter of the liquid outlet hole, and the inner diameters of the liquid inlet hole and the liquid outlet hole are the same.

[0013] On the basis of the above technical solution, preferably, the opening size of the sector-shaped hole gradually increases from the end facing the liquid inlet hole to the end away from the liquid inlet hole.

[0014] On the basis of the above technical solution, preferably, the width of the large-end opening of the sector-shaped hole near the liquid inlet hole is 2.5 mm to 5 mm, and the width of the small-end opening of the sector-shaped hole near the liquid inlet hole is 0.3 mm to 1 mm.

[0015] On the basis of the above technical solution, preferably, the distance from the small end of the sector-shaped hole to the inner end face of the cylindrical cavity is 1 mm to 5 mm.

[0016] On the basis of the above technical solution, preferably, positioning rings connected to the surface of the valve core are respectively arranged on both sides in the axial direction of the installation cavity.

[0017] On the basis of the above technical solution, preferably, it further includes a liquid inlet joint, a liquid outlet joint, a first end cover, and a second end cover. The liquid inlet joint is detachably and fixedly connected to the liquid inlet end of the valve body through the first end cover, and the liquid outlet joint is detachably and fixedly connected to the liquid outlet end of the valve body through the second end cover.

[0018] On the basis of the above technical solution, preferably, it further includes an adjusting handle. An installation hole communicating with the installation cavity is provided on the side wall of the valve body. The installation hole is perpendicular to the axial direction of the valve body. A connection groove is provided on the top surface of the valve core. One end of the valve rod is connected to the connection groove, and the other end passes through the installation hole and is perpendicularly and fixedly connected to the adjusting handle. The valve rod is in dynamic sealing connection with the installation hole.

[0019] The utility model has the following beneficial effects compared with the prior art:

[0020] (1) By providing a horizontal fan-shaped hole and a cylindrical cavity on the valve core, precise small-flow adjustment can be achieved. The fan-shaped hole provides fine flow control by adjusting the opening size to regulate the flow rate. The larger cavity of the cylindrical cavity effectively reduces the resistance of fluid flow, improves the flow velocity of the fluid. At the same time, the setting of the cylindrical cavity can prevent the accumulation of sediments, thereby improving the stability of flow control and the anti-blocking ability of the valve; (2) The length of the fan-shaped hole is adapted to the inner diameter of the liquid inlet of the valve body, which can ensure that the fan-shaped hole has a larger range of opening adjustment. This structural setting enables the fan-shaped hole to adjust the opening size within a larger range, thereby achieving a wider flow adjustment range and improving the flexibility and adaptability of flow adjustment.

[0021] (3) The inner diameter of the cylindrical cavity is adapted to the inner diameter of the liquid outlet hole, ensuring that there is no flow resistance when the fluid flows out of the cylindrical cavity, which helps to maintain a stable flow output. The inner diameters of the liquid inlet hole and the liquid outlet hole are the same. The same inner diameters of the liquid inlet hole and the liquid outlet hole can ensure that the fluid maintains a consistent flow velocity when entering and leaving the valve body, reducing the flow resistance or turbulence phenomenon caused by diameter changes, and helping to improve the accuracy and consistency of flow control.

[0022] (4) By making the hole wall of the fan-shaped hole inclined towards the cylindrical cavity, the fluid can more smoothly transition into the cylindrical cavity when flowing through the fan-shaped hole, which helps to reduce the risk of fluid retention and blockage in the narrow hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the regulating valve disclosed in the present invention in the fully closed state;

[0025] Figure 2 It is a schematic diagram of a half-sectional structure of the regulating valve disclosed in the present invention in the fully open state;

[0026] Figure 3 Schematic three-dimensional structure diagram of the valve core disclosed by the present utility model;

[0027] Figure 4 Top view of the fully open state of the regulating valve disclosed by the present utility model;

[0028] Figure 5 is Figure 4 Cross-sectional view taken along the plane A-A in

[0029] Figure 6 Schematic structure diagram of a kind of sector-shaped hole disclosed by the present utility model;

[0030] Figure 7 Top view of the partially open state of the regulating valve disclosed by the present utility model;

[0031] Figure 8 is Figure 7 Cross-sectional view taken along the plane B-B in

[0032] Reference numerals:

[0033] 1, valve body; 2, valve core; 3, valve stem; 21, sector-shaped hole; 22, cylindrical cavity; 11, installation cavity; 12, liquid inlet hole; 4, plugging member; 41, liquid outlet hole; 5, positioning ring; 6, liquid inlet joint; 7, liquid outlet joint; G1, first end cover; G2, second end cover; 13, installation hole; 8, adjusting handle; 23, connecting groove. Specific embodiments

[0034] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0035] As Figure 1 shown, in combination with Figure 2 , 3 , 4, 5, 7 and 8, an embodiment of the present utility model discloses a small-flow precision regulating valve, including a valve body 1, a valve core 2 located inside the valve body 1, and a valve stem 3 for driving the valve core 2 to rotate. A sector-shaped hole 21 is horizontally opened at the center of one side of the valve core 2 facing the liquid inlet direction of the valve body 1, and a cylindrical cavity 22 is opened at the center of one side of the valve core 2 facing the liquid outlet direction of the valve body 1. The cylindrical cavity 22 is communicated with the sector-shaped hole 21.

[0036] The sector-shaped hole 21 horizontally opened on the valve core 2 allows for precise control of the fluid flow rate by adjusting the opening size of the sector-shaped hole 21 during the horizontal rotation of the valve core 2. This horizontally arranged sector can dynamically adjust the flow rate when the valve core 2 rotates, thus achieving very fine flow control. For small flow applications, it can be adjusted with a smaller opening to meet the minute requirements for flow rate changes.

[0037] The design of the sector-shaped hole 21 can provide a stable flow rate when the fluid is flowing, reducing fluctuations in the flow. Since the opening size of the hole can be gradually adjusted, the flow rate of the fluid changes relatively smoothly when passing through the sector-shaped hole 21, which helps to precisely control the flow rate.

[0038] The fluid passing through the sector-shaped hole 21 enters the cylindrical cavity 22. The larger cavity of the cylindrical cavity 22 can reduce the fluid flow resistance, enabling the fluid to flow more smoothly. Due to the relatively large volume of the cylindrical cavity 22, the flow path of the fluid is relatively short, which is the diameter of the entire valve core 2, reducing the flow resistance and increasing the flow rate of the fluid. This structure optimizes the flow path of the fluid and improves the efficiency of flow rate adjustment.

[0039] The setting of the cylindrical cavity 22 can effectively prevent particles or sediments in the fluid from depositing in the channel because the larger cavity of the cavity reduces the residence time of the fluid in the channel and reduces the risk of sediment accumulation. Through this structural setting, the valve can reduce the occurrence of clogging when dealing with fluids containing particulate or crystalline deposits.

[0040] As some preferred embodiments, an installation cavity 11 is provided at the central axis of the valve body 1 for installing the valve core 2 to ensure the stable position of the valve core 2 inside the valve body 1. The liquid inlet hole 12 is coaxially opened at the liquid inlet end of the valve body 1, enabling the fluid to smoothly enter the valve body 1 and flow towards the valve core 2 for adjustment. This coaxial design helps the stable entry of the fluid and reduces flow interference. The liquid outlet end of the valve body 1 is detachably provided with a plugging member 4 for restricting the valve core 2 in the installation cavity 11. The plugging member 4 is coaxially provided with a liquid outlet hole 41 communicating with the installation cavity 11 and the liquid inlet hole 12. Through the setting of the plugging member 4, it is convenient to plug the liquid outlet end after assembling the valve core 2 from the liquid outlet end into the installation cavity 11, stably restricting the valve core 2 in the installation cavity 11 to prevent the valve core 2 from shifting or falling off during operation. At the same time, the liquid outlet hole 41 ensures the outflow of the fluid from the valve body 1 and communicates with the installation cavity 11 and the liquid inlet hole 12, maintaining the smooth flow path of the fluid.

[0041] At the same time, the detachable setting of the plugging member 4 facilitates the maintenance and replacement of the valve core 2.

[0042] As some preferred embodiments, the length of the fan-shaped hole 21 is adapted to the inner diameter of the liquid inlet hole 12 of the valve body 1. With this setting, it can be ensured that the fan-shaped hole 21 has a larger range of opening adjustment. This structural setting enables the fan-shaped hole 21 to adjust the opening size within a larger range, thereby achieving a wider flow rate adjustment range and improving the flexibility and adaptability of flow rate adjustment.

[0043] As some preferred embodiments, the inner diameter of the cylindrical cavity 22 is adapted to the inner diameter of the liquid outlet hole 41, ensuring that there is no flow resistance when the fluid flows out of the cylindrical cavity 22, which helps to maintain a stable flow rate output. The inner diameters of the liquid inlet hole 12 and the liquid outlet hole 41 are the same. The same inner diameters of the liquid inlet hole 12 and the liquid outlet hole 41 can ensure that the fluid maintains a consistent flow velocity when entering and leaving the valve body 1, reducing the flow resistance or turbulent flow phenomenon caused by diameter changes, and helping to improve the accuracy and consistency of flow rate control.

[0044] Refer to the attached Figure 5 As shown, in some embodiments, the hole wall of the fan-shaped hole 21 is parallel to the axis direction of the valve body 1. This makes the opening of the fan-shaped hole 21 maintain a uniform width in the entire hole length direction. This structural setting can provide a stable flow rate adjustment effect because the parallel design of the hole wall helps to maintain the uniformity and stability of fluid flow. When the fluid flows through the hole, there will be no flow rate fluctuations due to aperture changes, which is suitable for application scenarios that require a relatively constant flow rate.

[0045] Refer to the attached Figure 6 As shown, as some other embodiments, the opening size of the fan-shaped hole 21 gradually increases from the end facing the liquid inlet hole 12 to the end away from the liquid inlet hole 12. Specifically, the hole wall of the fan-shaped hole 21 is inclined, and the opening size gradually increases from the end close to the liquid inlet hole 12 and is inclined towards the cylindrical cavity 22. This structural setting can achieve more flexible flow rate adjustment. The gradually increasing aperture allows the fluid to gradually increase the flow rate when passing through the fan-shaped hole 21, so as to provide fine adjustment at low flow rates and quickly increase the flow rate when a large flow rate is required. This gradually changing aperture design helps to provide a wider adjustment range when the flow rate demand changes and can reduce the turbulent flow phenomenon of the fluid, making the adjustment smoother and more accurate.

[0046] At the same time, the hole wall of the fan-shaped hole 21 is inclined towards the cylindrical cavity 22, which can make the fluid flow more smoothly into the cylindrical cavity 22 when flowing through the fan-shaped hole 21. This structural setting helps to reduce the risk of fluid retention and blockage in the narrow channel because the inclined hole wall can reduce the local resistance of fluid flow and reduce the interference to fluid flow, thereby increasing the speed and efficiency of the fluid flowing into the cylindrical cavity 22. This design improves the smoothness of fluid flow and helps to avoid possible blockage problems.

[0047] In the above embodiments, the width of the large-end opening of the sector-shaped hole 21 near the liquid inlet hole 12 is 2.5 mm to 5 mm. This allows more fluid to pass through when the valve core 2 rotates to a larger opening, making it suitable for occasions with higher flow rates. This larger opening size provides the valve with the ability to adjust under larger flow conditions. The width of the small-end opening of the sector-shaped hole 21 near the liquid inlet hole 12 is 0.3 mm to 1 mm. This is suitable for use in small-flow regulation, providing finer flow control, especially in occasions with higher precise regulation requirements.

[0048] To ensure the maximum length of the cylindrical cavity 22 while avoiding penetrating the valve core 2, in this embodiment, the distance from the small end of the sector-shaped hole 21 to the inner end face of the cylindrical cavity 22 is set to 1 mm to 5 mm. This not only ensures the structural strength of the valve core 2 but also ensures that the cylindrical cavity 22 can make full use of the space, optimize the fluid flow path, and improve the effect of flow regulation.

[0049] Preferably, positioning rings 5 connected to the surface of the valve core 2 are respectively arranged on both sides in the axial direction of the installation cavity 11. The setting of the positioning rings 5 improves the stability of the valve core 2, ensures its correct position during operation, and helps maintain the coaxiality of the valve core 2 and the valve body 1 by accurately positioning the valve core 2, thus improving the accuracy and consistency of flow regulation.

[0050] Preferably, it further includes a liquid inlet connector 6, a liquid outlet connector 7, a first end cover G1, and a second end cover G2. The liquid inlet connector 6 is detachably and fixedly connected to the liquid inlet end of the valve body 1 through the first end cover G1. This setting allows fluid to smoothly enter the valve body 1 from the liquid inlet connector 6, and the detachable first end cover G1 provides flexibility in installation and disassembly, facilitating maintenance and cleaning. The liquid outlet connector 7 is detachably and fixedly connected to the liquid outlet end of the valve body 1 through the second end cover G2. This enables the fluid to smoothly flow out from the liquid outlet connector 7, and at the same time, it is convenient to disassemble and replace the liquid outlet connector 7, improving the convenience of use.

[0051] The liquid inlet connector 6 and the liquid outlet connector 7 are detachably fixed through end covers, facilitating the daily maintenance, cleaning, and replacement of parts of the valve. This modular design greatly improves the operability and maintenance efficiency of the valve.

[0052] The detachable design of the first end cover G1 and the second end cover G2 not only improves the overall structural flexibility of the valve but also facilitates the replacement or adjustment of the specifications of the liquid inlet and liquid outlet connectors 7 according to requirements in different application scenarios to adapt to different fluid control needs.

[0053] As some preferred embodiments, it further includes an adjusting handle 8. An installation hole 13 communicating with the installation cavity 11 is formed in the side wall of the valve body 1. The installation hole 13 is perpendicular to the axial direction of the valve body 1. A connection groove 23 is formed in the top surface of the valve core 2. One end of the valve stem 3 is connected to the connection groove 23, and the other end passes through the installation hole 13 and is perpendicularly and fixedly connected to the adjusting handle 8. The valve stem 3 is movably sealed with the installation hole 13. With this setting, the valve stem 3 can be driven to rotate by the adjusting handle 8 and transmitted to the valve core 2, so as to control the opening size of the fan-shaped hole 21 and realize flow regulation.

[0054] A movable seal connection is adopted between the valve stem 3 and the installation hole 13 to ensure that fluid leakage will not occur during the adjustment process, improving the sealing performance and safety of the valve.

[0055] The valve stem 3 and the valve core 2 are connected through the connection groove 23, which facilitates the detachable installation of the valve stem 3 and the valve core 2 on the valve body 1 and is convenient for replacement or maintenance.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A small flow precision regulating valve, comprising a valve body (1), a valve core (2) located in the valve body (1), and a valve stem (3) for driving the valve core (2) to rotate, characterized in that: A fan-shaped hole (21) is horizontally opened at the center of the valve core (2) on the side facing the liquid inlet direction of the valve body (1), and a columnar cavity (22) is opened at the center of the valve core (2) on the side facing the liquid outlet direction of the valve body (1), and the columnar cavity (22) is connected to the fan-shaped hole (21).

2. The small flow precision regulating valve according to claim 1, characterized in that: The valve body (1) is provided with an installation cavity (11) at the center axis thereof for installing the valve core (2); a liquid inlet hole (12) is coaxially provided at the liquid inlet end of the valve body (1); a sealing member (4) is detachably provided at the liquid outlet end of the valve body (1) for restricting the valve core (2) in the installation cavity (11); a liquid outlet hole (41) is coaxially provided on the sealing member (4) and is connected to the installation cavity (11) and the liquid inlet hole (12).

3. The small flow precision regulating valve according to claim 2, characterized in that: The length of the fan-shaped hole (21) is matched to the inner diameter of the liquid inlet hole (12) of the valve body (1).

4. The small flow precision regulating valve according to claim 3, characterized in that: The inner diameter of the columnar cavity (22) is matched to the inner diameter of the liquid outlet hole (41), and the inner diameters of the liquid inlet hole (12) and the liquid outlet hole (41) are the same.

5. The small flow precision regulating valve according to claim 4, characterized in that: The opening size of the fan-shaped hole (21) gradually increases from an end facing the liquid inlet hole (12) to an end away from the liquid inlet hole (12).

6. The small flow precision regulating valve according to claim 4 or 5, characterized in that: The width of the large end opening of the fan-shaped hole (21) close to the liquid inlet hole (12) is 2.5 mm to 5 mm, and the width of the small end opening of the fan-shaped hole (21) close to the liquid inlet hole (12) is 0.3 mm to 1 mm.

7. The small flow precision regulating valve according to claim 4 or 5, characterized in that: The distance from the small end of the fan-shaped hole (21) to the inner end surface of the cylindrical cavity (22) is 1 mm to 5 mm.

8. The small flow precision regulating valve according to claim 2, characterized in that: Positioning rings (5) connected to the surface of the valve core (2) are respectively arranged on both sides of the installation cavity (11) in the axial direction.

9. The small flow precision regulating valve according to claim 2, characterized in that: The valve body (1) further comprises a liquid inlet connector (6), a liquid outlet connector (7), a first end cover (G1) and a second end cover (G2); the liquid inlet connector (6) is detachably fixedly connected to the liquid inlet end of the valve body (1) via the first end cover (G1), and the liquid outlet connector (7) is detachably fixedly connected to the liquid outlet end of the valve body (1) via the second end cover (G2).

10. The small flow precision regulating valve according to claim 2, characterized in that: It also includes an adjusting handle (8), the side wall of the valve body (1) is provided with a mounting hole (13) connected to the mounting cavity (11), the mounting hole (13) is perpendicular to the axial direction of the valve body (1), the top surface of the valve core (2) is provided with a connecting groove (23), one end of the valve stem (3) is connected to the connecting groove (23), and the other end passes through the mounting hole (13) and is vertically fixedly connected to the adjusting handle (8), and the valve stem (3) is dynamically sealed with the mounting hole (13).

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