A valve plate structure, a butterfly valve and a valve stem mounting method

Abstract

This invention discloses a valve plate structure, a butterfly valve, and a valve stem installation method. The valve plate structure includes a valve plate and a valve stem, which are detachably connected to the valve plate and relatively fixed after connection. The valve stem includes a driving rod and a driven rod. Two mounting seats are symmetrically arranged on the upper and lower surfaces of the valve plate. The driving rod and the driven rod are respectively fixed to the corresponding mounting seats by a locking structure. The axes of the driving rod and the driven rod are located on the same horizontal plane, which reduces the installation difficulty of the valve stem and improves the service life of the valve stem. The butterfly valve includes the above-mentioned valve plate structure, and the valve stem can still accurately drive the valve plate after long-term use. The valve stem installation method reduces the installation difficulty of the valve stem.

Description

Technical Field

[0001] This invention relates to the field of valves, and more particularly to a valve plate structure, a butterfly valve, and a valve stem installation method. Background Technology

[0002] In industrial valve applications, the reliability of the connection between the valve stem and the valve plate has a decisive impact on valve performance. Current technology generally employs an integrated valve stem design, achieving a fixed connection through a keyway on the valve plate and a key on the valve stem. This keyed connection structure is difficult to install, and after long-term operation, due to factors such as dynamic impact of the fluid medium, temperature cycling, and mechanical vibration, the clearance between the key and the keyway inevitably widens gradually. This increased clearance leads to relative displacement of the connection points, making it impossible for the valve plate to maintain a stable, fully open or fully closed position during rotational operation. Specifically, this manifests as media leakage when the butterfly valve is closed, or insufficient flow cross-section when open, leading to system pressure fluctuations and inaccurate flow control. These problems are particularly pronounced under frequent opening and closing or high-load conditions, not only weakening the valve's sealing performance but also potentially causing production interruptions, threatening the continuous operation and long-term stability of the entire process system. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a valve plate structure.

[0004] The technical solution of this invention is implemented as follows: A valve plate structure includes a valve plate and a valve stem, wherein the valve stem is detachably connected to the valve plate and is fixed relative to it after connection. The valve stem includes a driving rod and a driven rod. Two mounting seats are symmetrically arranged on the upper and lower surfaces of the valve plate. The driving rod and the driven rod are respectively fixed to the corresponding mounting seats by a locking structure. The axes of the driving rod and the driven rod are located on the same horizontal plane.

[0005] Preferably, the mounting base is provided with a connecting hole; the bottom end of the driving rod and the top end of the driven rod are both provided with connecting sections; the connecting section of the driving rod is adapted to the connecting hole of the upper mounting base; and the connecting section of the driven rod is adapted to the connecting hole of the lower mounting base.

[0006] Preferably, the cross-section of the connecting hole is a triangular shape with convex arc sides and the corners of adjacent arc sides are rounded.

[0007] Preferably, the diameter of the connection hole of the upper mounting base gradually decreases from top to bottom, while the diameter of the connection hole of the lower mounting base gradually increases from top to bottom.

[0008] Preferably, the locking structure includes a threaded hole on the end face of the connecting section, a fixing plate vertically disposed in the connecting hole, and a bolt adapted to the threaded hole. The fixing plate is provided with a through hole for the bolt thread to pass through.

[0009] Preferably, the threaded hole is offset from the center of the end face of the connecting section in a direction away from the valve plate.

[0010] Preferably, the bolt is located inside the connecting hole, and the distance between the two mounting seats is greater than the length of the bolt.

[0011] Preferably, a reinforcing seat is provided between the mounting base and the valve plate.

[0012] A butterfly valve includes a valve body and a valve plate structure, wherein the valve plate structure is as described above. The valve body includes a channel, and the valve plate is located within the channel. The valve body has a first through hole for a driving rod to pass through and a second through hole for a driven rod to pass through. Part of the driving rod passes vertically upward through the first through hole and part of the driven rod passes vertically downward through the second through hole. The driving rods passing through the valve body are connected to an external driving structure, which is used to drive the valve rod to rotate.

[0013] A valve stem mounting method for the aforementioned valve stem includes the following steps: S1: Pre-set the valve plate in the channel of the valve body, adjust the position of the valve plate so that the connection hole of the upper mounting seat is aligned with the first through hole, and the connection hole of the lower mounting seat is aligned with the second through hole. S2: The drive rod passes through the first through hole and enters the connection hole of the upper mounting base; the driven rod passes through the second through hole and enters the connection hole of the lower mounting base. S3: The drive rod is fixed in the connection hole of the upper mounting base by a locking structure; the drive rod is fixed in the connection hole of the lower mounting base by a locking structure.

[0014] The principle and beneficial effects of the present invention, which adopts the above technical solution, are as follows: 1. From the installation angle of the valve stem, the split valve stem is shorter and can be assembled from both sides of the valve body, which greatly reduces the installation difficulty.

[0015] 2. From the perspective of the operational accuracy of the valve stem after long-term use, the gap between the key and the keyway of the existing valve stem will increase after long-term operation, which will affect the valve stem's drive on the valve plate. The valve stem connection section mentioned in this application is a triangular prism section with a tapered shape. The contact area between the connection section and the connection hole is larger and can form a self-locking mechanism, that is, the valve stem can still accurately drive the valve plate after long-term operation.

[0016] 3. From the perspective of the installation of the locking structure, the eccentric design of the threaded hole can provide more installation space for the bolt, further reducing the difficulty of installing the valve stem. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a butterfly valve; Figure 2 This is a schematic diagram of a butterfly valve from another angle; Figure 3 This is a schematic diagram of the valve plate structure; Figure 4 This is a schematic diagram of the valve plate; Figure 5 This is a sectional view of the active valve stem and mounting base; Figure 6 This is a schematic diagram of the drive rod and bolts; Figure 7 This is a schematic diagram of the driven rod and bolt.

[0018] The labels for the attached figures are as follows: 1. Valve plate; 2. Valve stem; 3. Drive rod; 4. Driven rod; 5. Mounting seat; 6. Connecting section; 7. Connecting hole; 8. Threaded hole; 9. Fixing plate; 10. Bolt; 11. Through hole; 12. Reinforcing seat; 13. Butterfly valve; 14. Valve body; 15. Channel. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0021] The specific embodiments of the present invention are as follows: like Figures 1 to 7As shown, the present invention provides a valve plate structure, including a valve plate 1 and a valve stem 2. The valve stem 2 is detachably connected to the valve plate 1 and is relatively fixed after connection. The valve stem 2 includes a driving rod 3 and a driven rod 4. Two mounting seats 5 are symmetrically arranged on the upper and lower surfaces of the valve plate 1. The driving rod 3 and the driven rod 4 are respectively fixed to the corresponding mounting seats 5 by locking structures. The axes of the driving rod 3 and the driven rod 4 are located on the same horizontal plane. The mounting seats 5 are provided with connecting holes 7. The bottom end of the driving rod 3 and the top end of the driven rod 4 are provided with connecting sections 6. The connecting sections 6 of the driving rod 3 are adapted to the connecting holes 7 of the upper mounting seat 5. The connecting sections 6 of the driven rod 4 are adapted to the connecting holes 7 of the lower mounting seat 5. The cross-section of the connecting hole 7 is a convex arc-shaped triangle with rounded corners between adjacent arc sides. The shape of the connecting hole 7 enables the valve stem 2 to form a self-locking mechanism within the connecting hole 7, and ensures that the valve stem 2 and the connecting hole 7 have good integration, thus preventing wear on the inner wall of the valve stem 2 and the connecting hole 7.

[0022] In this design, the valve stem 2 includes a driving rod 3 and a driven rod 4. The driving rod 3 receives torque from an external driving structure. The driven rod 4 rotates following the driving rod 3. The valve stem 2 drives the valve plate 1 to rotate, controlling fluid flow or regulating flow rate. Two mounting seats 5 are used to fix the structures of the driving rod 3 and the driven rod 4, respectively. By adopting a split design for the valve stem 2, the lengths of the driving rod 3 and the driven rod 4 are reduced, allowing for installation from both sides of the valve body 14, thus simplifying installation. It should be noted that the adjacent sides of the arc-shaped triangle have rounded corners, reducing installation difficulty and optimizing the stress distribution of the connecting hole 7, thereby improving the fatigue life and reliability of the structure.

[0023] In this embodiment, the diameter of the connecting hole 7 in the upper mounting base 5 gradually decreases from top to bottom, while the diameter of the connecting hole 7 in the lower mounting base 5 gradually increases from top to bottom. This arrangement facilitates the insertion of the connecting segment 6 into the connecting hole 7 and increases the contact area between the connecting segment 6 and the connecting hole 7, resulting in a progressively tight fit between the connecting segment 6 and the connecting hole 7. This achieves a secure connection between the valve stem 2 and the valve plate 1, reliably withstanding and transmitting large torques, significantly extending the service life of the valve plate structure, and ensuring its opening and closing accuracy during long-term operation. A reinforcing seat 12 is provided between the mounting base 5 and the valve plate 1. By providing the reinforcing seat 12, the connection strength between the mounting base 5 and the valve plate 1 is improved, resulting in a longer service life for the mounting base 5.

[0024] The locking structure includes a threaded hole 8 on the end face of the connecting section 6, a fixing plate 9 vertically disposed within the connecting hole 7, and a bolt 10 adapted to the threaded hole 8. The fixing plate 9 has a through hole 11 through which the bolt 10 passes. During actual installation, the bolt head of the bolt 10 is located on the outside of the fixing plate 9, and the bolt 10 enters the outside of the fixing plate 9 through the through hole 11 and screws into the threaded hole 8, thus locking the connecting section 6 onto the fixing plate 9.

[0025] In this embodiment, the threaded hole 8 is offset from the center of the end face of the connecting section 6 in a direction away from the valve plate 1. This arrangement provides more space for the installation of the bolt 10. In addition, the bolt 10 is located inside the connecting hole 7. The bolt 10 is located inside the connecting hole 7, which effectively protects the bolt 10 and avoids loosening and external interference that may be caused by the bolt 10 being exposed, thereby improving the fixing effect and overall reliability of the locking structure. The distance between the two mounting seats 5 is greater than the length of the bolt 10, so the two mounting seats 5 will not interfere with the bolt 10 when it is installed.

[0026] This embodiment also provides a butterfly valve 13, which includes a valve body 14 and a valve plate structure. The valve plate structure is the valve plate structure described above. The valve body 14 includes a channel 15, and the valve plate 1 is located within the channel 15. The valve body 14 is provided with a first through hole for the drive rod 3 to pass through and a second through hole for the driven rod 4 to pass through. Part of the drive rod 3 passes vertically upward through the first through hole and part of the driven rod 4 passes vertically downward through the second through hole. The drive rod 3 that passes through the valve body 14 is connected to an external drive structure, which is used to drive the rod 3 to rotate. With the above-described valve plate structure, the wear at the connection between the valve stem 2 and the valve plate 1 is significantly reduced, and the valve plate 1 can still maintain the accurate opening and closing position after long-term use.

[0027] This embodiment provides another method for installing the valve stem 2, used for the valve stem 2 described above, characterized by including the following steps: S1: The valve plate 1 is pre-positioned within the channel of the valve body 14. The position of the valve plate 1 is adjusted so that the connecting hole 7 of the upper mounting base 5 is aligned with the first through hole, and the connecting hole 7 of the lower mounting base 5 is aligned with the second through hole, thus achieving precise alignment between the valve plate 1 and the through hole of the valve body 14. This ensures smooth insertion of the valve stem 2 and reliable connection. S2: Drive rod 3 passes through the first through hole and enters the connection hole 7 of the upper mounting base 5; driven rod 4 passes through the second through hole and enters the connection hole 7 of the lower mounting base 5. Drive rod 3 and driven rod 4 are accurately introduced into the mounting base 5 of valve plate 1 to facilitate subsequent locking steps. S3: The drive rod 3 is fixed in the connection hole 7 of the upper mounting base 5 by the locking structure; the drive rod 3 is fixed in the connection hole 7 of the lower mounting base 5 by the locking structure; the bolt 10 passes through the fixing plate 9 and is screwed into the threaded hole 8 of the rod connecting section 6. By tightening the bolt 10, a strong preload is generated, thereby axially tightening the rod and radially pressing it into the mounting base 5, effectively preventing it from loosening or falling off.

[0028] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A valve plate structure, characterized in that, The valve includes a valve plate and a valve stem. The valve stem is detachably connected to the valve plate and is relatively fixed after connection. The valve stem includes a driving rod and a driven rod. The valve plate has two mounting seats symmetrically arranged on its upper and lower surfaces. The driving rod and the driven rod are respectively fixed to the corresponding mounting seats by a locking structure. The axes of the driving rod and the driven rod are located on the same horizontal plane.

2. The valve plate structure according to claim 1, characterized in that, The mounting base is provided with a connection hole; the bottom end of the driving rod and the top end of the driven rod are both provided with a connecting section; the connecting section of the driving rod is adapted to the connecting hole of the upper mounting base; the connecting section of the driven rod is adapted to the connecting hole of the lower mounting base.

3. The valve plate structure according to claim 2, characterized in that, The cross-section of the connecting hole is a triangular shape with convex arc sides and the corners of adjacent arc sides are rounded.

4. The valve plate structure according to claim 3, characterized in that, The diameter of the connection hole on the upper mounting base gradually decreases from top to bottom, while the diameter of the connection hole on the lower mounting base gradually increases from top to bottom.

5. A valve plate structure according to claim 1, characterized in that, The locking structure includes a threaded hole on the end face of the connecting section, a fixing plate vertically installed in the connecting hole, and a bolt adapted to the threaded hole. The fixing plate is provided with a through hole for the bolt thread to pass through.

6. A valve plate structure according to claim 5, characterized in that, The threaded hole is offset from the center of the end face of the connecting section in a direction away from the valve plate.

7. A valve plate structure according to claim 6, characterized in that, The bolt is located inside the connecting hole, and the distance between the two mounting seats is greater than the length of the bolt.

8. The valve plate structure according to claim 1, characterized in that, A reinforcing seat is provided between the mounting base and the valve plate.

9. A butterfly valve, characterized in that, The butterfly valve includes a valve body and a valve plate structure. The valve plate structure is the valve plate structure according to any one of claims 1 to 8. The valve body includes a channel, and the valve plate is located in the channel. The valve body is provided with a first through hole for the driving rod to pass through and a second through hole for the driven rod to pass through. Part of the driving rod passes vertically upward through the first through hole and part of the driven rod passes vertically downward through the second through hole. The driving rod that passes through the valve body is connected to an external driving structure, which is used to drive the valve rod to rotate.

10. A valve stem installation method for the valve stem as described in claim 9, characterized in that, Includes the following steps: S1: Pre-set the valve plate in the channel of the valve body, adjust the position of the valve plate so that the connection hole of the upper mounting seat is aligned with the first through hole, and the connection hole of the lower mounting seat is aligned with the second through hole. S2: The drive rod passes through the first through hole and enters the connection hole of the upper mounting base; the driven rod passes through the second through hole and enters the connection hole of the lower mounting base. S3: The drive rod is fixed in the connection hole of the upper mounting base by a locking structure; the drive rod is fixed in the connection hole of the lower mounting base by a locking structure.

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