Rail ball valve stem connected with sectional structure

Abstract

A track ball valve stem connected with segmented structure, including middle stem, upper stem and lower stem, the upper stem is connected with hand wheel, the lower stem is connected with valve body, both ends of the middle stem are fixed with the upper stem and the lower stem respectively, the middle stem includes connecting rod and guide sleeve, the guide sleeve is provided with split guide rail and the outer diameter of the guide sleeve is greater than the outer diameter of the connecting rod, the upper stem and the lower stem respectively. The utility model discloses beneficial effects are: through segmented structure design, the valve stem is divided into upper, middle and lower three parts, effectively disperses the bending stress and torque impact in the operation process, avoids the fatigue fracture problem caused by stress concentration of single long valve stem, thereby improve the overall reliability and service life of the valve stem.

Description

TECHNICAL FIELD

[0001] The utility model relates to a valve rod, especially a track ball valve valve rod connected with sectional structure. BACKGROUND

[0002] As a kind of key fluid control equipment, track ball valve is widely used in high pressure, high temperature or corrosive medium pipeline system of petroleum, natural gas, chemical industry and water treatment industry. Its valve rod as core transmission component, connect external operating mechanism (such as manual handle or electric actuator) and internal ball, realize the accurate control of valve by specific track movement mechanism. In the use process, operating force acts on valve rod, drives ball to carry out axial lifting to separate from valve seat, then rotates 90 degrees to change flow passage state, to complete opening or closing operation. This design ensures sealing performance and operation reliability, is suitable for frequent opening and closing and severe working condition, but the strength and durability of valve rod directly affect the performance and life of whole valve.

[0003] However, the valve rod of existing track ball valve is mostly made of integral molding structure, due to the overall length design of valve is longer to adapt to specific installation demand, leading to corresponding overlong valve rod. This overlong valve rod is susceptible to bending stress, torque impact and vibration in operation process, especially under high pressure or frequent opening and closing condition, stress concentrates in middle part or connecting position of valve rod, easily causes fatigue fracture. This not only reduces the structural strength and reliability of valve rod, but also increases maintenance cost and failure risk, affects the safe operation of whole pipeline system. UTILITY MODEL CONTENTS

[0004] In view of the deficiency of prior art, the utility model provides a track ball valve valve rod for preventing overlong valve rod from breaking and enhancing structural strength.

[0005] To realize the above-mentioned purpose, the utility model technical scheme is as follows: a track ball valve valve rod connected with sectional structure, including middle valve rod, upper valve rod and lower valve rod, the upper valve rod is connected with hand wheel, the lower valve rod is connected with valve body, the both ends of middle valve rod are fixed with upper valve rod and lower valve rod respectively, the middle valve rod includes connecting rod and guide sleeve, the guide sleeve is provided with split guide rail, and the outer diameter of guide sleeve is greater than the outer diameter of connecting rod, upper valve rod and lower valve rod respectively.

[0006] The utility model discloses beneficial effect is: through sectional structure design, the valve stem is divided into upper, middle, lower three parts, effectively dispersed the bending stress and torque impact in the operation process, avoided the fatigue fracture problem of single long valve stem because of stress concentration, thereby improved the overall reliability and service life of valve stem. The outer diameter of the guide sleeve is increased, so that the size of the split guide rail is correspondingly increased, the contact area and the carrying capacity when cooperating with the ball are enhanced, and the stability and the anti-vibration performance of the valve stem in the up-down movement and rotation process are further improved. As a preferred mode, the guide sleeve can be made of integral forging process, and a threaded interface matched with the connecting rod is arranged in the guide sleeve, so that the guide sleeve is quickly assembled through screwing, and the split guide rail groove of the guide sleeve is designed in the shape of an involute, so that the rolling track of the ball is optimized, and friction and wear are reduced. As another preferred mode, the connecting rod and the guide sleeve are connected through a key groove, the key groove is arranged in the axial direction, and a high-strength alloy key is embedded in the key groove to transmit torque and prevent relative rotation, so that the valve stem can still maintain structural integrity under high pressure.

[0007] Further, the guide sleeve is provided with a mortise slot at one end thereof facing the upper valve rod, the upper valve rod is provided with a tenon head corresponding to the mortise slot, the two ends of the tenon head are provided with auxiliary reinforcing parts, the mortise slot is provided with fixing holes corresponding to the auxiliary reinforcing parts, and a fixing pin is arranged in the fixing holes and penetrates through the auxiliary reinforcing parts.

[0008] This connection mode realizes quick alignment and preliminary fixation between the upper valve rod and the guide sleeve through the mortise and tenon structure, the auxiliary reinforcing parts increase the contact area and disperse local stress, and the penetration design of the fixing pin provides additional mechanical locking to prevent the tenon head from being pulled out of the mortise slot under vibration or impact conditions, so that the reliability and safety of the connection are enhanced. As a preferred mode, the tenon head can be designed in a T-shaped structure, the auxiliary reinforcing parts on the two sides of the tenon head are convex wing plates, the mortise slot is provided with a groove corresponding thereto, the fixing holes penetrate through the wing plates and the side walls of the groove, the fixing pin is a threaded pin, and a nut is screwed to apply a pre-tightening force, so that the connection part is not loose. As another preferred mode, the auxiliary reinforcing parts can be integrated with spring washers, the spring washers provide continuous elastic pressure after the fixing pin is inserted, compensate for the gap caused by temperature changes or wear, and maintain the stability of the connection.

[0009] Further, the tenon head comprises a pressing part, a bearing is arranged between the pressing part and the end face of the mortise slot close to the guide sleeve, and an open ring is arranged between the pressing part and the end face of the mortise slot away from the guide sleeve.

[0010] The structure reduces the rotation friction and torque of the valve stem during operation through the bearing, making the opening and closing more smooth and reducing the operation force. For the split ring, the bearing is stably fixed between the guide sleeve and the compression part by applying axial compression force to the compression part, preventing the bearing from shifting or loosening during operation, thereby ensuring the stability of long-term operation and low maintenance requirement. As a preferred mode, the bearing can adopt an angular contact ball bearing, the inner ring of which is interference-fitted with the compression part, and the outer ring is fixed with the mortise and tenon groove end face through the snap spring. The split ring is a split ring structure, which is fastened on the compression part by bolts, generating uniform axial pressure, pre-tightening the bearing and eliminating the play. As another preferred mode, the split ring can be designed as a tapered ring, the inner inclined surface of which matches the tapered surface of the compression part. By rotating the adjusting nut on the split ring, the split ring is gradually compressed, thereby accurately controlling the pre-tightening force of the bearing and adapting to the load changes under different working conditions.

[0011] Further, the middle valve rod is provided with a countersunk head on the side facing the guide sleeve, and the guide sleeve is provided with a counterbore corresponding to the countersunk head.

[0012] The cooperation of the countersunk head and the counterbore provides a simple and effective fixing method, ensuring the alignment and connection strength between the middle valve rod and the guide sleeve, avoiding relative movement or rotation, thereby improving the rigidity and transmission efficiency of the valve rod as a whole. As a preferred mode, the countersunk head can be designed as a multi-prism shape, and the counterbore is correspondingly designed as a matching polygonal hole, realizing keyless connection through press-fit, and a threaded hole is processed at the end of the countersunk head, which is screwed from the outside of the guide sleeve to enhance the tensile strength. As another preferred mode, an adhesive layer can be added between the countersunk head and the counterbore, and high-strength epoxy resin is applied during assembly, forming chemical bonding after curing, supplementing the deficiency of mechanical fixation, and improving the durability in corrosive environments.

[0013] Further, the lower valve rod is provided with a rectangular fixing groove at the center of the end face on the side facing the middle valve rod, and the middle valve rod is provided with a fixing head matching the shape of the fixing groove at the center of the end face on the side facing the lower valve rod, which cooperates with the fixing head and the fixing groove to form the fixation between the middle valve rod and the lower valve rod.

[0014] The cooperation of the rectangular fixing groove and the fixing head ensures the accurate alignment and high concentricity between the middle valve rod and the lower valve rod, reducing the assembly error and the running deflection, thereby improving the transmission accuracy and overall stability of the valve rod, which is suitable for harsh conditions such as high pressure and frequent opening and closing. As a preferred mode, the fixing head can be designed as a rectangular boss with a chamfer, and the fixing groove is correspondingly designed as a precisely processed groove, and fine tooth patterns are processed on the side faces of the boss and the groove, which transmit torque through tooth pattern engagement to prevent relative rotation. As another preferred mode, a positioning pin can be provided between the fixing head and the fixing groove, which is inserted along the diagonal direction. During assembly, the pin holes are aligned first, and then the fixing head is pressed in, ensuring the high-precision cooperation of one-time molding and reducing the adjustment time.

[0015] Furthermore, a fastening hole is provided through the lower valve stem, the cross-section of the fastening hole is located in the fixing groove, and a fastener is provided through the fastening hole with the fastening head being provided.

[0016] The design of the fastening hole and fastener further strengthens the connection between the fixed head and the fixed groove. Mechanical locking prevents loosening or detachment, enhancing the valve stem's resistance to vibration and impact under dynamic loads and ensuring long-term operational reliability. As a preferred method, the fastener can be a double-ended bolt, with one end threaded into the fastening hole of the lower valve stem and the other end passing through the fixed head and locked with a lock nut. An elastic washer is added to the center of the bolt to absorb vibration energy. Alternatively, the fastening hole can be designed as an angled hole, with its axis forming an angle with the bottom surface of the fixed groove. The fastener is a tapered pin, which, upon hammering in, generates radial expansion force, causing the fixed head to fit tightly against the wall of the fixed groove, achieving a self-locking effect. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of an embodiment of the present utility model;

[0018] Figure 2 This is a partial cross-sectional view of the guide sleeve in an embodiment of the present utility model;

[0019] Figure 3 This is a partial cross-sectional view from a top view of the connection between the guide sleeve and the upper valve stem in an embodiment of this utility model.

[0020] Figure 4 This is a partial sectional view of the connection between the valve stem and the lower valve stem in an embodiment of this utility model;

[0021] Figure 5 This is a partial sectional view from a top view of the connection between the valve stem and the lower valve stem in an embodiment of this utility model. Detailed Implementation

[0022] This utility model embodiment describes a ball valve stem with a segmented connection structure, such as... Figures 1-5 As shown: The valve includes a middle valve stem 1, an upper valve stem 2, and a lower valve stem 3. The upper valve stem 2 is connected to the handwheel, and the lower valve stem 3 is connected to the valve body. The two ends of the middle valve stem 1 are fixed to the upper valve stem 2 and the lower valve stem 3 respectively to achieve a segmented connection, thus avoiding the problem of easy breakage due to excessive valve stem length. The middle valve stem 1 includes a connecting rod 11 and a guide sleeve 12. The guide sleeve 12 is provided with a split guide rail 121, and the outer diameter of the guide sleeve 12 is larger than the outer diameters of the connecting rod 11, the upper valve stem 2, and the lower valve stem 3, respectively. This ensures that the size of the split guide rail 121 is increased, improving its structural strength when it engages with the ball bearings, thereby reliably driving the entire valve stem to move up and down and rotate.

[0023] The guide sleeve 12 has a tenon groove 122 at one end facing the upper valve stem 2. The upper valve stem 2 has a tenon head 21 corresponding to the tenon groove 122. The two ends of the tenon head 21 have auxiliary reinforcing parts 211. The tenon groove 122 has a fixing hole 1221 corresponding to the auxiliary reinforcing part 211. A fixing pin 4 is inserted into the fixing hole 1221 and is arranged to penetrate the auxiliary reinforcing part 211 so as to realize the rotation and fixation of the tenon head 21 in the tenon groove 122 and prevent it from falling off during operation by fixing pin 4. The tenon head 21 includes a clamping part 212. A bearing 5 is provided between the clamping part 212 and the end face of the tenon groove 122 near the guide sleeve 12. A split ring 6 is provided between the clamping part 212 and the end face of the tenon groove 122 away from the guide sleeve 12. The split ring 6 is clamped on the clamping part 212 by applying axial clamping force and transmitting it to the bearing 5, so that the bearing 5 is stably fixed between the guide sleeve 12 and the clamping part 212, thereby reducing the torque during valve stem operation.

[0024] A countersunk head 111 is provided on the side of the middle valve stem 1 facing the guide sleeve 12. The guide sleeve 12 is provided with a countersunk hole 123 corresponding to the countersunk head 111. The countersunk head 111 is fixed in the countersunk hole 123 to achieve a reliable connection between the middle valve stem 1 and the guide sleeve 12. A rectangular fixing groove 31 is provided at the center of the end face of the lower valve stem 3 facing the middle valve stem 1. A fixing head 112 that matches the shape of the fixing groove 31 is provided at the center of the end face of the middle valve stem 1 facing the lower valve stem 3. The fixing head 112 and the fixing groove 31 cooperate to form a fixation between the middle valve stem 1 and the lower valve stem 3, improving the concentricity between the two. A fastening hole 311 is provided through the lower valve stem 3. The cross-section of the fastening hole 311 is located in the fixing groove 31. A fastener 7 is provided through the fastening hole 311 and is provided through the fixing head 112 to further strengthen the connection between the fixing head 112 and the fixing groove 31.

[0025] The assembly process of this embodiment is as follows: During assembly, firstly, the countersunk head 111 of the middle valve stem 1 is inserted into the countersunk hole 123 of the guide sleeve 12 for fixation, ensuring a stable connection; then, the tenon head 21 of the upper valve stem 2 is aligned with the tenon groove 122 of the guide sleeve 12 and inserted, and locked by the fixing pin 4 passing through the fixing hole 1221 and the auxiliary reinforcement part 211. At the same time, the bearing 5 and the split ring 6 are pressed by the clamping part 212 to achieve smooth rotation and torque reduction; finally, the fixing groove 31 of the lower valve stem 3 is aligned and engaged with the fixing head 112 of the middle valve stem 1, and fastened by the fastener 7 passing through the fastening hole 311 and the fixing head 112, completing the segmented connection. During operation, rotating the handwheel drives the upper valve stem 2 to rotate. Through the engagement of the split guide rail 121 of the middle valve stem 1 and the ball bearing, the valve stem is raised, lowered, and rotated, thereby controlling the opening and closing of the ball valve. The segmented structure effectively enhances the overall rigidity and durability.

[0026] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A ball valve stem employing a segmented connection structure, characterized in that: It includes a middle valve stem, an upper valve stem, and a lower valve stem. The upper valve stem is connected to a handwheel, and the lower valve stem is connected to a valve body. The two ends of the middle valve stem are fixed to the upper valve stem and the lower valve stem, respectively. The middle valve stem includes a connecting rod and a guide sleeve. The guide sleeve is provided with split guide rails, and the outer diameter of the guide sleeve is larger than the outer diameters of the connecting rod, the upper valve stem, and the lower valve stem, respectively.

2. The ball valve stem of the track valve with segmented connection structure according to claim 1, characterized in that: The guide sleeve has a tenon groove at one end facing the upper valve stem. The upper valve stem has a tenon head corresponding to the tenon groove. The two ends of the tenon head are provided with auxiliary reinforcement parts. The tenon groove is provided with a fixing hole corresponding to the auxiliary reinforcement part. A fixing pin is inserted into the fixing hole and the fixing pin is provided through the auxiliary reinforcement part.

3. The ball valve stem of the track valve with segmented connection structure according to claim 2, characterized in that: The tenon and mortise head includes a clamping part, a bearing is provided between the clamping part and the end face of the tenon and mortise groove near the guide sleeve, and a split ring is provided between the clamping part and the end face of the tenon and mortise groove away from the guide sleeve.

4. The ball valve stem of the track valve with segmented connection structure according to claim 1, characterized in that: The valve stem has a countersunk head on the side facing the guide sleeve, and the guide sleeve has a countersunk hole corresponding to the countersunk head.

5. The valve stem of the ball valve with a segmented connection structure according to claim 1, characterized in that: A rectangular fixing groove is provided at the center of the end face of the lower valve stem facing the middle valve stem, and a fixing head adapted to the shape of the fixing groove is provided at the center of the end face of the middle valve stem facing the lower valve stem. The fixing head and the fixing groove cooperate to form a fixation between the middle valve stem and the lower valve stem.

6. The ball valve stem of the track valve with segmented connection structure according to claim 5, characterized in that: A fastening hole is provided through the lower valve stem. The cross-section of the fastening hole is located in the fixing groove. A fastener is inserted through the fastening hole and is provided as a through fixing head.

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