A valve core valve rod clamping structure of a single seat valve

Abstract

The utility model belongs to valve technical field, especially point to a single seat valve's valve core valve stem clamping structure, single seat valve contains valve stem, valve core and locking nut, three are connected as a whole through the thread, still include: annular recess, form in the outer periphery of valve core, split hoop piece is formed by two symmetrical hoop half rings, the appearance after the hoop is closed and is matched with annular recess, the butt -joint end of two hoop half rings is equipped with the connecting portion and is fixed through the fastener, at least one positioning rib board is located in the inboard of hoop half ring, and the positioning rib board is positioned with the corresponding rib groove on valve core, at least one anti -rotation limiting piece is assembled on hoop half ring, and the anti -rotation limiting piece is matched with the groove wall of annular recess to limit split hoop piece relative valve core circumferential rotation. The utility model can obtain a kind of valve core valve stem clamping structure which can realize stable clamping, effective anti-loose of valve core valve stem connecting portion by the above technical scheme.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and specifically refers to a valve core and valve stem clamping structure for a single-seat valve. Background Technology

[0002] As a core component of fluid control systems, single-seat valves are widely used in media switching and flow regulation scenarios in industries such as food, pharmaceuticals, and chemicals. Sanitary single-seat valves, with their reliable sealing and convenient disassembly and assembly, have become the mainstream choice for clean environments.

[0003] In existing single-seat valves, the valve stem, valve core, and lock nut are directly connected by threads. Conventional anti-loosening methods often use cotter pins, lock nuts, or washers. This structure easily creates sanitary dead zones within the valve body, failing to meet the cleaning requirements of clean environments. Furthermore, under long-term vibration and media erosion, the threads are still prone to loosening, leading to asynchronous valve stem and valve core movement, valve seal failure, and affecting normal equipment operation. Therefore, there is an urgent need for a valve stem clamping structure that can securely clamp the valve stem and valve core connection and effectively prevent loosening. Utility Model Content

[0004] This invention solves the problems mentioned in the background art by setting a split clamping component on the outer periphery of the valve core, and cooperating with a positioning rib and an anti-rotation limiting component to achieve clamping and circumferential limiting of the connection between the valve core and the valve stem.

[0005] The technical solution of this utility model is implemented as follows: a valve core and valve stem clamping structure for a single-seat valve, wherein the single-seat valve includes a valve stem, a valve core, and a locking nut, which are connected as one unit by threads, and further includes: An annular groove is formed on the outer periphery of the valve core; The split clamp component is formed by two symmetrical clamp half-rings enclosing each other. The shape after enclosing is adapted to the annular groove. The mating ends of the two clamp half-rings are provided with connecting parts and are fixed by fasteners. At least one positioning rib is provided on the inner side of the clamp half ring, and the positioning rib cooperates with the corresponding rib groove on the valve core for positioning. At least one anti-rotation limiting component is assembled on the clamp half-ring, and the anti-rotation limiting component cooperates with the groove wall of the annular groove to limit the circumferential rotation of the split clamp component relative to the valve core.

[0006] The present invention is further configured such that the split clamp is embedded inside the annular groove and does not protrude from the outer contour surface of the valve core after assembly.

[0007] The present invention is further configured such that the connecting part of the clamp half-ring is a symmetrically arranged connecting ear, and the connecting ear extends outward along the radial direction of the clamp half-ring.

[0008] The present invention is further configured such that the fastener is a bolt assembly, and the bolt assembly passes through the connecting part to lock and fix the two clamp half rings.

[0009] The present invention is further configured such that the anti-rotation limiting component is a double-headed elastic pin that passes through the clamp half-ring along the axial direction, and the two ends of the double-headed elastic pin are respectively limited and engaged with the upper and lower groove walls of the annular groove.

[0010] The present invention is further configured such that the double-headed elastic pin includes a fixing part fixed to the clamp half ring, and pin heads respectively movably connected to both ends of the fixing part, and the upper and lower groove walls of the annular groove are provided with pin grooves adapted to the pin heads.

[0011] The present invention is further configured such that an elastic washer is sleeved between the split clamp and the annular groove, and the elastic washer fills the mating gap between the two.

[0012] By adopting the above technical solution, the beneficial effects that this utility model can achieve are: 1. The valve core and valve stem connection is securely clamped by the cooperation of the split clamping parts and the positioning ribs, which improves the anti-loosening reliability of the connection structure.

[0013] 2. By cooperating with the anti-rotation limiting component and the annular groove wall, the circumferential movement of the split clamping component is restricted, thereby improving the operational stability of the clamping structure.

[0014] 3. The compact assembly design, which combines an embedded split clamp with an elastic gasket, improves the overall assembly accuracy and adaptability to operating conditions of the valve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a first cross-sectional structural diagram of the present invention; Figure 3 This is a utility model Figure 2 A magnified structural diagram of part A; Figure 4 This is a schematic diagram of the second cross-sectional structure of this utility model; Figure 5 This is a utility model Figure 4 Schematic diagram of the cross-sectional structure at point BB.

[0016] The attached figures are labeled as follows: 1. Valve stem; 2. Valve core; 3. Locking nut; 4. Annular groove; 5. Split clamp; 50. Clamp half ring; 6. Connecting part; 7. Fastener; 8. Positioning rib; 9. Rib groove; 10. Anti-rotation limiting part; 11. Fixing part; 12. Pin head; 13. Pin groove. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-5 : Example 1:

[0018] This embodiment provides a valve core and valve stem clamping structure for a single-seat valve. The single-seat valve includes a valve stem 1, a valve core 2, and a locking nut 3, which are connected as a single unit by threads. It also includes: An annular groove 4 is formed on the outer periphery of the valve core 2; The split clamp component 5 is formed by two symmetrical clamp half rings 50. The shape after the clamping is adapted to the annular groove 4. The mating ends of the two clamp half rings 50 are provided with connecting parts 6 and are fixed by fasteners 7. At least one positioning rib 8 is provided on the inner side of the clamp half ring 50, and the positioning rib 8 is positioned in conjunction with the corresponding rib groove 9 on the valve core 2. At least one anti-rotation limiting member 10 is assembled on the clamp half ring 50. The anti-rotation limiting member 10 cooperates with the groove wall of the annular groove 4 to restrict the circumferential rotation of the split clamp member 5 relative to the valve core 2.

[0019] This single-seat valve mainly consists of a cylinder assembly, a bracket, an upper seat, a lower seat, a valve stem 1, a valve core 2, a locking nut 3, and sealing rings. The cylinder assembly is securely connected to the upper and lower seats below via the bracket. The upper and lower seats interlock to form the medium flow channel of the valve. The valve stem 1 transmits power to the cylinder; its upper end is connected to the cylinder assembly, and its lower end extends into the internal cavity of the lower seat. The valve core 2 and locking nut 3 are both located inside the lower seat. The lower end of the valve stem 1 is connected to the valve core 2 and locking nut 3 sequentially by threaded engagement. The three components form a non-rotatable integral structure inside the lower seat. The valve core 2 adopts an I-shaped structure, with sealing rings fitted on its upper and lower sides respectively. The upper sealing ring is used to seal with the sealing surface of the upper seat, and the lower sealing ring is used to seal with the sealing surface of the lower seat. When the cylinder assembly is running, it drives the valve stem 1 to make a linear reciprocating motion up and down. The valve stem 1 synchronously drives the valve core 2 to move. By the contact or separation of the sealing rings with the corresponding valve seats, the opening and closing of the medium flow channel can be controlled.

[0020] The outer peripheral wall of the I-shaped valve core 2 is formed with an annular groove 4. This groove is an annular groove that serves as an installation and accommodating space for the clamping structure. The clamping structure is embedded in the groove as a whole. After assembly, it does not protrude from the outer contour surface of the valve core 2 and will not interfere with the movement of the valve core 2 or the flow of the medium.

[0021] The clamping structure is a split clamping component 5, which is formed by two clamping half-rings 50 that are completely symmetrical in shape and size. The clamping half-rings 50 are arc-shaped plate structures. Both the split clamping component 5 and the clamping half-rings 50 are made of stainless steel, which has sufficient structural strength and is suitable for corrosive working conditions of fluid media. The overall outline of the two clamping half-rings 50 after being enclosed matches the internal outline of the annular groove 4, and can be completely fitted into the annular groove 4. Each clamping half-ring 50 has an integrally formed connecting ear at the mating end. The connecting ear extends outward along the radial direction of the clamping half-ring 50. When the two clamping half-rings 50 are enclosed, the opposite connecting ears fit together. The fitted connecting ears are locked through by a bolt assembly. The shank of the bolt passes through the through hole on the connecting ear and is screwed into the matching nut to tighten it, fixing the two clamping half-rings 50 into a complete annular clamping component, so that it tightly clamps the valve core 2 at the annular groove 4.

[0022] Each clamping half-ring 50 has an integrally formed positioning rib 8 on its inner wall. The positioning rib 8 is a plate-shaped protrusion extending along the axial direction of the valve core 2. It is evenly distributed along the circumference of the clamping half-ring 50 and corresponds to the rib grooves 9 on the valve core 2. The positioning rib 8 is an integral structure with the clamping half-ring 50. The outer peripheral wall of the valve core 2 has rib grooves 9 that are adapted to the number, position, and shape of the positioning rib 8. The side of the positioning rib 8 away from the clamping half-ring 50 is embedded in the rib groove 9 and fits against the inner wall of the rib groove 9. Through the cooperation of the positioning rib 8 and the rib groove 9, the radial and axial movement of the split clamping part 5 relative to the valve core 2 is constrained.

[0023] An anti-rotation limiting member 10 is axially inserted on the clamp half-ring 50. The anti-rotation limiting member 10 is a double-headed elastic pin. The middle part of the double-headed elastic pin is a fixing part 11. The fixing part 11 is a hollow cylindrical structure. The fixing part 11 is tightly inserted into the axial mounting hole of the clamp half-ring 50 to realize the fixed assembly of the double-headed elastic pin and the clamp half-ring 50. Pin heads 12 are telescopically embedded in the inner cavities at both ends of the fixing part 11. The pin heads 12 are connected to the fixing part 11 through elastic telescopic cooperation. An elastic element is provided in the inner cavity of the fixing part 11. The elastic element provides the elastic driving force for the extension and retraction of the pin heads 12 to ensure that the pin heads 12 are stably inserted into the pin groove 13. The pin head 12 can extend and retract within the inner cavity of the fixing part 11. The upper and lower groove walls of the annular groove 4 are respectively provided with pin grooves 13. In the assembled state, the pin head 12 extends out under elastic action and is inserted into the corresponding pin groove 13. Through the engagement and cooperation between the pin head 12 and the pin groove 13, the circumferential rotation of the split clamp 5 relative to the valve core 2 is restricted.

[0024] An elastic washer is fitted between the split clamp 5 and the inner wall of the annular groove 4. The elastic washer is a ring-shaped elastic component, fitted on the outside of the split clamp 5 and embedded in the annular groove 4 together with the split clamp 5. The elastic washer is made of food-grade silicone rubber or polytetrafluoroethylene, which has stable elastic deformation capability and resistance to media corrosion, and is suitable for use in sanitary fluid conditions. The outer wall of the elastic washer fits tightly with the inner wall of the annular groove 4, and the inner wall fits tightly with the outer wall of the split clamp 5, filling the assembly gap between the split clamp 5 and the annular groove 4 and buffering the vibration stress during equipment operation.

[0025] After the overall assembly is completed, the valve stem 1, valve core 2, and locking nut 3 are connected by threads and then locked again by the clamping action of the split clamp 5. The positioning rib plate 8 and the rib groove 9 cooperate to constrain the radial and axial displacement of the split clamp 5. The double-headed elastic pin and the pin groove 13 cooperate to restrict the circumferential rotation of the split clamp 5. The elastic washer ring fills the gap and buffers vibration. The synergistic effect of multiple structures ensures that the connection between the valve stem 1 and the valve core 2 remains stable. When the cylinder assembly drives the valve stem 1 to move up and down, the stable connection structure ensures that the power is transmitted without loss. The valve core 2 synchronously drives the upper and lower sealing rings to accurately engage with the corresponding valve seats, stably realizing the opening and closing control of the flow channel. This clamping structure is detachable. During maintenance, only the bolt assembly needs to be removed to take out the two clamp half rings 50 from the annular groove 4 of the valve core 2, realizing the separation of the valve core 2 and the valve stem 1 without disassembling the entire valve structure.

[0026] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A valve core and valve stem clamping structure for a single-seat valve, the single-seat valve comprising a valve stem (1), a valve core (2), and a locking nut (3), the three being connected as a single unit by threads, characterized in that, Also includes: An annular groove (4) is formed on the outer periphery of the valve core (2); The split clamp component (5) is formed by two symmetrical clamp half rings (50) enclosing each other. The shape after enclosing is adapted to the annular groove (4). The mating ends of the two clamp half rings (50) are provided with connecting parts (6) and fixed by fasteners (7). At least one positioning rib (8) is provided on the inner side of the clamp half ring (50), and the positioning rib (8) is positioned in conjunction with the corresponding rib groove (9) on the valve core (2); At least one anti-rotation limiting member (10) is assembled on the clamp half ring (50), and the anti-rotation limiting member (10) cooperates with the groove wall of the annular groove (4) to restrict the circumferential rotation of the split clamp member (5) relative to the valve core (2).

2. The stem-and-spool clamping structure of a single-seat valve according to claim 1, characterized in that, The split clamp (5) is embedded in the annular groove (4) and does not protrude from the outer contour surface of the valve core (2) after assembly.

3. The stem-and-spool clamping structure of a single-seat valve according to claim 1, wherein The connecting part (6) of the clamp half ring (50) is a symmetrically arranged connecting ear, which extends outward along the radial direction of the clamp half ring (50).

4. The stem-and-spool clamping structure of a single-seat valve according to claim 1, wherein The fastener (7) is a bolt assembly that passes through the connection part (6) to lock and fix the two clamp half rings (50).

5. The stem-and-spool clamping structure of a single-seat valve according to claim 1, wherein The anti-rotation limiting component (10) is a double-headed elastic pin that passes through the clamp half-ring (50) along the axial direction. The two ends of the double-headed elastic pin are respectively limited and matched with the upper and lower groove walls of the annular groove (4).

6. A stem-and-spool clamping structure for a single seat valve according to claim 5, wherein The double-headed elastic pin includes a fixing part (11) fixed to the clamp half ring (50) and a pin head (12) movably connected to both ends of the fixing part (11). The upper and lower groove walls of the annular groove (4) are provided with pin grooves (13) that are adapted to the pin head (12).

7. The stem-and-spool clamping structure of a single-seat valve according to claim 1, wherein An elastic washer is fitted between the split clamp (5) and the annular groove (4), and the elastic washer fills the gap between the two.

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