Water conservancy throttling device

Abstract

The utility model discloses a water conservancy throttling device, including valve body, valve cover, valve stem, cage cover body, valve seat and valve core. The valve stem drives the valve core to go up and down through trapezoidal thread pair, and the cage cover body side wall is equipped with multistage throttling window and realizes flow regulation. The valve core top is equipped with the ladder conical hole that is composed of first sealing cone hole and second guide cone hole, and the valve stem bottom end is connected with ladder conical throttling plug through the connecting screw with radial clearance. When the valve is closed, the big taper section of throttling plug forms the metal hard sealing pair with first sealing cone hole and realizes reliable cut-off, and the small taper section forms the throttling gap with second guide cone hole. The structure is through the floating connection design and ensures that the sealing surface adapts to the combination, and has the accurate throttling and zero leakage cut-off function under the high pressure difference, and is especially suitable for water conservancy pipeline system.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy pipeline facilities technology, specifically to a water conservancy throttling device. Background Technology

[0002] In water conservancy systems, throttling devices not only need to control flow but also require reliable shut-off functions to handle scenarios such as maintenance and pipeline switching. However, current throttling devices generally suffer from a core deficiency—a lack of effective shut-off functionality. Existing devices often focus solely on throttling regulation, with rudimentary core sealing structures and fixed connections between the throttling component and valve stem, making disassembly and maintenance impossible. Even when the throttling component is adjusted to its extreme position, media leakage still occurs, failing to achieve complete shut-off. Furthermore, the connection structure lacks compensation capabilities, and system installation errors or temperature deformation can easily lead to misalignment between the valve core and the throttling component, further exacerbating shut-off failure. Additionally, worn throttling components cannot be replaced individually; the entire valve stem assembly must be replaced, resulting in high maintenance costs. This situation of "throttling without shut-off + inconvenient maintenance" necessitates the addition of shut-off valves during water conservancy system maintenance, increasing costs and installation space. Leakage also wastes water resources and can even cause system pressure disturbances, severely hindering the safe and efficient operation of water conservancy systems. Therefore, a water conservancy throttling device with enhanced shut-off functionality and convenient maintenance is urgently needed to solve this problem. Utility Model Content

[0003] In view of the problems and shortcomings of the existing technology, this utility model provides a water-saving device.

[0004] The technical solution of this utility model is as follows: A hydraulic throttling device includes a valve body, a valve cover, a valve stem, a drive handwheel, a cage-like body, a valve seat, and a valve core. The valve body has a fluid channel cast inside, and flanges at both ends for easy integration with external piping systems. The valve cover is connected to the top of the valve body, forming the main pressure-bearing structure of the device. The valve stem vertically penetrates the center of the valve cover, with its upper end fixedly connected to the drive handwheel to receive operating torque, and its lower end connected to the upper end of the valve core for transmitting motion and power. The cage-like body is fixed at a predetermined position within the valve body's inner cavity and fitted over the valve core. Its sidewalls have multiple stepped throttling windows evenly arranged circumferentially, with orifices decreasing in diameter along the flow direction, thereby achieving multi-stage pressure reduction and precise throttling of the fluid. The valve seat is fixed to the bottom of the valve body's flow channel, directly opposite the outlet of the cage-like body. The lower part of the valve core mates with the valve seat and has an internal connecting hole.

[0005] The device also includes a throttling plug and a connecting screw; the throttling plug is connected to the bottom of the valve stem by the connecting screw, and is generally in the shape of a stepped cone, including a large cone section for shut-off at the top and a small cone section for throttling at the bottom; the top opening of the valve core is a stepped cone-shaped hole, which consists of a first sealing cone hole at the top and a second guide cone hole at the bottom. The large cone section of the throttling plug is precisely matched with the first sealing cone hole to ensure a reliable metal hard seal is formed when fully seated, while the diameter of the small cone section is designed to be smaller than that of the second guide cone hole, so that an annular throttling gap can be formed when the small cone section enters the second guide cone hole to achieve pre-regulation of the flow rate.

[0006] A radial clearance is provided between the shank of the connecting screw and the central mounting hole of the throttling plug. This design gives the throttling plug a certain degree of floating self-adaptability, compensating for machining and assembly errors and ensuring uniform contact and effective sealing of the sealing pair. The sealing surface of the large conical section of the throttling plug is overlaid with hard alloy, while the cone angle and surface finish of the first sealing cone hole meet the contact accuracy requirements of the hard sealing pair. Together, they significantly improve the erosion and wear resistance of the sealing surface, extending the service life of the device in particulate fluids. The cone angle of the second guide cone hole is the same as that of the first sealing cone hole. This consistent design facilitates the machining and precision control of the stepped conical hole and ensures the centering of the throttling plug during movement. The throttling windows of the cage body are spaced apart axially, and the diameter gradually decreases along the flow direction. This structure enables gradual and smooth pressure reduction of the fluid, effectively suppressing cavitation and noise generation, and improving the flow field distribution within the flow channel. A mechanical or electronic valve opening indicator is integrated above the drive handwheel to display the real-time valve opening, providing operators with intuitive position feedback and facilitating precise flow control. The valve stem seal ring, located within the valve cover's stuffing box, utilizes a wear-resistant and corrosion-resistant elastic sealing material. It achieves dynamic sealing during axial movement of the valve stem, reliably preventing fluid leakage along the valve stem. A pressure relief valve is installed on the upper side wall of the valve body, its inlet connected to the upper cavity of the valve body. This valve safely releases excessive pressure within the valve body cavity after closure or under abnormal operating conditions, protecting the valve stem seal and other critical components.

[0007] The beneficial effects of this utility model are: Through the precise matching design of the stepped conical throttling plug and the valve core, the shut-off performance is specially enhanced. The upper conical section of the throttling plug and the upper conical hole of the valve core form a precision metal hard seal pair. The sealing surface has a high degree of fit and a large contact area, which can completely block the flow of media. This fundamentally solves the defect of existing devices that cannot shut off, avoids water waste and system pressure disorder, and eliminates the need for additional shut-off valves, reducing costs and installation space.

[0008] Meanwhile, the detachable connection between the throttling plug and the valve stem is achieved by connecting screws, which not only ensures the stability of the connection between the two and guarantees the reliability of force transmission during throttling and shut-off, but also allows for individual disassembly and replacement of the throttling plug after the sealing surface wears down, without the need to replace the entire valve stem assembly, thus significantly reducing maintenance costs and operational difficulties.

[0009] The gap design between the lower conical section of the throttling plug and the lower conical hole of the valve core ensures the shut-off effect while eliminating the risk of operational jamming. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 for Figure 1 View from direction A; The components represented by the reference numerals in the diagram are: 1. Opening adjustment handwheel; 2. Valve cover; 3. Valve stem; 4. Valve stem sealing ring; 5. Cage body; 6. Throttling plug; 7. Pressure relief valve; 8. Valve body; 9. Connecting screw; 10. Valve seat; 11. Valve core. Detailed Implementation

[0011] The technical means adopted to achieve the intended purpose of this utility model will be further described below with reference to the accompanying drawings of the embodiments of this utility model.

[0012] Example A water-saving device for water pipelines, see [link / reference] Figure 1 and Figure 2 The main structure of the device is a valve body 8, which has an internal fluid channel and standard flanges at both ends for connection to pipelines. The valve cover 2 is fastened to the top flange of the valve body 8 by a set of high-strength bolts, and a metal spiral wound gasket is placed at the mating surface to ensure the reliability of the static seal. The valve stem 3 vertically penetrates the center of the valve cover 2, its upper end is fixedly connected to the drive handwheel 1, and its lower end is connected to the upper end of the valve core 11 through a trapezoidal thread pair. A dynamic seal is achieved between the valve stem 3 and the valve cover 2 by a valve stem sealing ring 4 located within the stuffing box of the valve cover 2.

[0013] The cage sleeve 5, as a key throttling element, is fixed at a predetermined position within the valve body 8. Multiple stepped throttling windows, evenly arranged circumferentially and with progressively smaller diameters along the flow direction, are precisely machined on the sidewalls of the cage sleeve 5. These windows are responsible for multi-stage pressure reduction of the fluid to control the flow rate. The valve seat 10 is fixedly installed at the bottom of the flow channel of the valve body 8 with an interference fit, directly opposite the outlet of the cage sleeve 5. The valve seat 10 is fixed inside the valve body 8, and the lower part of the valve core 11 is fixed to the valve seat 10, with a through-hole running along the axis inside.

[0014] The core improvement of this utility model lies in the opening at the top of the connecting hole of the valve core 11 and the structure of the throttling plug 6 that matches it. The throttling plug 6 is connected to the bottom end of the valve stem 3 by a connecting screw 9. The throttling plug 6 is generally stepped conical, with a large conical section for shut-off at the top and a small conical section for throttling at the bottom. The top opening of the valve core 11 is a stepped conical hole. This hole consists of a first sealing conical hole at the top and a second guiding conical hole at the bottom. The first sealing conical hole is located at the top of the valve core 11, and its cone angle and surface finish requirements are extremely high. The second guiding conical hole is located at the bottom of the first sealing conical hole, and its cone angle may be the same as or slightly different from that of the first sealing conical hole, but its large end diameter is smaller than that of the large end diameter of the first sealing conical hole. The cone angle and size of the large conical section of the throttling plug 6 are precisely matched with the first sealing conical hole of the valve core 11 so as to achieve a shut-off function when the throttling plug 6 is fully seated in the valve core 11. In addition, preferably, its sealing surface is overlaid with hard alloy to provide wear resistance. The cone angle of the small cone segment is adapted to the second guide cone hole of the valve core 11, but its design size is slightly smaller to ensure that when the throttling plug 6 begins to enter the valve core 11, an annular gap is formed to reduce the flow rate, thereby achieving flow regulation. An appropriate radial clearance is designed between the shank of the connecting screw 9 and the center mounting hole of the throttling plug 6. This allows the throttling plug 6, under the constraint of the connecting screw 9, to have limited radial floating and deflection freedom, thus enabling it to adaptively align with the first sealing cone hole of the valve core 11 and ensure uniform contact of the sealing pair.

[0015] In addition, a pressure relief valve 7 is installed on the upper side wall of the valve body 8. Its inlet is connected to the upper cavity of the valve body 8. It is used to release pressure after the valve is closed or when the pressure inside the valve rises abnormally due to temperature changes, thus protecting the valve stem seal and other components. A mechanical or electronic opening indicator mechanism can be integrated above the drive handwheel 1 to visually display the real-time opening degree of the valve.

[0016] In the on or flow regulation state (see...) Figure 1 Rotating the drive handwheel 1 clockwise moves the valve stem 3 upward. The upward movement of the valve stem 3 gradually exposes the throttling windows on the cage body 5. Fluid enters from the inlet, and after being progressively depressurized by the throttling windows of the cage body 5, flows through the flow channel between the valve core 11 and the cage body 5, finally exiting through the valve seat 10. By precisely controlling the lifting height of the valve stem 3, the effective throttling area can be linearly adjusted, thereby achieving precise flow control. During this process, the throttling plug 6 rises together with the valve stem 3 and the valve core 11, completely separating from the stepped conical orifice inside the valve core 11, thus preventing flow resistance.

[0017] During the closing and shutdown process (see...) Figure 2The handwheel 1 is rotated counterclockwise, causing the valve stem 3 to move downwards. The closing process can be divided into three stages: In the initial stage, the valve stem 3 moves downwards, and the lower conical surface of the throttling plug 6 first forms an annular gap with the valve port of the valve core 11, reducing the flow rate; In the final stage, the valve stem 3 continues to move downwards, and the large conical section of the throttling plug 6 fits tightly with the first sealing conical hole of the valve core 11, forming an independent metal hard seal pair. The guide conical section of the throttling plug 6 is then inserted into the second guide conical hole of the valve core 11.

[0018] The floating design of the connecting screw 9 ensures that the throttling plug 6 can adaptively adjust its position, so that the large cone section and the first sealing cone hole can achieve uniform contact across the entire circumference, forming a reliable hard seal.

Claims

1. A water-saving device, comprising a valve body (8), a valve cover (2), a valve stem (3), a drive handwheel (1), a cage body (5), a valve seat (10), and a valve core (11); characterized in that, The valve body (8) has a fluid channel cast inside, and flanges connected to pipes are provided at both ends; the valve cover (2) is connected to the top of the valve body (8); the valve stem (3) vertically penetrates the center of the valve cover (2), the upper end is fixedly connected to the drive handwheel (1), and the lower end is connected to the upper end of the valve stem (3); the cage body (5) is fixed in a predetermined position in the inner cavity of the valve body (8) and sleeved on the outside of the valve stem (3), and the side wall is provided with multiple stepped throttling windows that are evenly arranged in the circumferential direction and whose aperture gradually decreases along the flow direction; the valve seat (10) is fixed at the bottom of the flow channel of the valve body (8) and faces the outlet of the cage body (5), the lower part of the valve core (11) is fixed on the valve seat (10), and a connecting hole is provided inside; The device also includes a throttling plug (6) and connecting screws; The throttling plug (6) is connected to the bottom of the valve stem (3) by connecting screws (9). The whole is in the shape of a stepped cone, including a large cone section for shut-off at the top and a small cone section for throttling at the bottom. The top opening of the valve core (11) is a stepped cone hole, which is composed of a first sealing cone hole at the top and a second guide cone hole at the bottom. The large cone section of the throttling plug (6) is precisely matched with the first sealing cone hole, and the diameter of the small cone section is smaller than that of the second guide cone hole.

2. The water-saving device according to claim 1, characterized in that, A radial gap is provided between the shank of the connecting screw (9) and the central mounting hole of the throttling plug (6).

3. The water-saving device according to claim 1, characterized in that, The sealing surface of the large cone section of the throttling plug (6) is overlaid with hard alloy, and the cone angle and surface finish of the first sealing cone hole meet the contact accuracy requirements of the hard sealing pair.

4. The water-saving device according to claim 1, characterized in that, The cone angle of the second guide cone hole is the same as that of the first sealing cone hole.

5. The water-saving device according to claim 1, characterized in that, The throttling windows of the cage body (5) are spaced apart along the axial direction, and the diameter of the orifice gradually decreases along the flow direction.

6. The water-saving device according to claim 1, characterized in that, The drive handwheel (1) is equipped with a mechanical or electronic opening indicator mechanism to display the real-time opening of the valve.

7. The water-saving device according to claim 1, characterized in that, The valve cover (2) is provided with a valve stem sealing ring (4) in the stuffing box. The valve stem sealing ring (4) is made of wear-resistant and media corrosion-resistant elastic sealing material, which achieves dynamic sealing when the valve stem (3) moves axially.

8. The water-saving device according to claim 1, characterized in that... A pressure relief valve (7) is installed on the upper side wall of the valve body (8), and its inlet is connected to the upper cavity of the valve body (8).

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