A positioning and connecting structure of a valve stem and a butterfly plate of a butterfly valve

Abstract

The utility model discloses a kind of positioning connection structure of butterfly valve stem and butterfly plate, including including valve body, the inside of valve body is equipped with butterfly valve stem, fixed disc plate and rotating disc plate, the inside of the valve body is installed in the fixed disc plate, multiple fixed shaft tubes are installed on the fixed disc plate, multiple rotating shaft tubes are installed on the rotating disc plate, the rotating shaft tube is fixedly connected on the butterfly valve stem, the butterfly valve stem is inserted on the valve body and multiple the fixed shaft tube by sealing bearing, the utility model relates to butterfly valve technical field, through the mechanical rigidity locking of electromagnetic telescopic lock and insert mount limiting block, the problem that traditional butterfly valve is prone to position drift under vibration impact is solved completely, the accuracy and reliability of valve plate positioning are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically to a positioning connection structure for a butterfly valve stem and butterfly plate. Background Technology

[0002] As a commonly used fluid control component, the butterfly valve's core function is to drive the butterfly plate to rotate via the valve stem, thereby opening and closing pipelines and regulating flow. However, existing butterfly valves have revealed several technical defects that urgently need to be addressed during long-term use, especially under high-pressure, high-frequency, or pressure-fluctuating conditions.

[0003] Firstly, regarding positioning and locking, traditional butterfly valves typically rely solely on the torque of the valve stem to maintain the open and closed position of the disc. This method, which depends on a continuous torque supply from a drive source, is prone to slight angular displacement or "drifting" of the disc under system vibration or pressure shock, leading to sealing failure or decreased regulation accuracy. Some improved solutions employ mechanical limiting, but these are often structurally complex and struggle to achieve reliable self-locking in a sealed state, failing to meet the requirements of high-reliability applications.

[0004] Secondly, regarding sealing performance, conventional butterfly valves typically employ an interference fit ("compression" seal) between a rubber sealing ring fixed to the butterfly plate and the valve body sealing surface. This sealing method places extremely high demands on the manufacturing precision of the butterfly plate and the alignment during installation. Furthermore, the sealing ring is prone to wear and aging, resulting in a limited seal life. After wear, the sealing pressure decreases, easily leading to internal leakage. In addition, traditional sealing structures lack an effective wear compensation mechanism, causing the sealing performance to gradually decline over time.

[0005] Furthermore, in terms of automation and intelligent control, although existing electric or pneumatic butterfly valves have achieved automated drive, their locking and sealing processes are often separate or lack effective status feedback. Operators find it difficult to monitor the locking status and sealing tightness of the valve in real time and accurately, making it impossible to achieve fault early warning and precise process control. This restricts the integrated application of valves in intelligent pipeline systems. In view of this, this case was developed through in-depth research into the above problems. Utility Model Content

[0006] To achieve the above objectives, this utility model provides the following technical solution: a positioning and connection structure for a butterfly valve stem and a butterfly plate, comprising a valve body, a butterfly valve stem, a fixed disc, and a rotating disc mounted on the inner side of the valve body. The fixed disc is mounted on the inner side of the valve body, and multiple fixed shaft tubes are mounted on the fixed disc. Multiple rotating shaft tubes are mounted on the rotating disc, and the rotating shaft tubes are fixedly connected to the butterfly valve stem. The butterfly valve stem is inserted into the valve body and the multiple fixed shaft tubes via sealed bearings. The butterfly valve stem is connected to the rotating shaft tubes. The fixed disc and the rotating disc are equipped with... The airbag has multiple semi-circular telescopic grooves on the fixed disc plate, and an insertion limiting block is installed on the rotating disc plate. The insertion limiting block is movably inserted into the inner side of the semi-circular telescopic groove. An electromagnetic telescopic lock is provided on the semi-circular telescopic groove. An insertion limiting groove is provided on the insertion limiting block. An expansion compression hole is provided on the fixed disc plate. The inner side of the expansion compression hole is connected to the airbag. An expansion telescopic cylindrical block is installed on the inner side of the expansion compression hole. A sealing ring rubber ring is installed on the expansion telescopic cylindrical block. A telescopic magnet is installed on the expansion telescopic cylindrical block. A telescopic electromagnet is installed on the inner side of the expansion compression hole.

[0007] Preferably, the electromagnetic telescopic lock is equipped with a position sensor and a return spring. The position sensor is used to detect whether the insertion limit block is in place, and the return spring is used to automatically retract the electromagnetic telescopic lock when the power is off.

[0008] Preferably, the sealing airbag is embedded in an annular groove on the end face of the fixed disc facing the rotating disc.

[0009] Preferably, a central controller is installed on the valve body, and the central controller is electrically connected to the position sensor of the electromagnetic telescopic lock, the drive circuit of the electromagnetic telescopic lock, and the telescopic electromagnet.

[0010] Preferably, the contact surfaces of the insert limiting block and the semi-circular telescopic groove, as well as the contact surfaces of the expansion telescopic cylindrical block and the expansion extrusion hole, are coated with a wear-resistant and friction-reducing material layer.

[0011] Preferably, the fixed disc also integrates a pressure sensor that communicates with the sealing airbag.

[0012] This utility model provides a positioning connection structure for the valve stem and disc of a butterfly valve. It offers the following advantages: This positioning connection structure for the valve stem and disc, through the mechanical hard locking of an electromagnetic telescopic lock and a cartridge limit block, completely solves the problem of position drift easily caused by vibration and impact in traditional butterfly valves, significantly improving the accuracy and reliability of valve disc positioning; it adopts a flexible sealing method using a pneumatically driven sealing airbag, which not only greatly reduces the stringent requirements for disc processing and installation, but also possesses excellent adaptive compensation capabilities, automatically adjusting the sealing specific pressure to compensate for wear and aging, thereby greatly extending the sealing life and eliminating internal leakage; the integrated position and pressure sensors work in conjunction with the central controller to form an intelligent system with real-time status monitoring, closed-loop control, and fault diagnosis capabilities, achieving a leap from "passive operation" to "active management," ultimately achieving a perfect unity of high reliability, long-lasting sealing, and intelligent operation and maintenance. Attached Figure Description

[0013] Figure 1 This is a front sectional view of the positioning and connection structure of the butterfly valve stem and butterfly plate described in this utility model.

[0014] Figure 2 for Figure 1 A magnified view of the letter "A" in the image.

[0015] Figure 3 This is a top sectional view of the positioning and connection structure of the butterfly valve stem and butterfly plate described in this utility model.

[0016] In the diagram: 1. Valve body; 2. Butterfly valve stem; 3. Fixed disc; 4. Rotating disc; 5. Fixed shaft tube; 6. Rotating shaft tube; 7. Sealing airbag; 8. Semi-circular telescopic groove; 9. Inserted limit block; 10. Electromagnetic telescopic lock; 11. Expansion extrusion hole; 12. Telescopic electromagnet; 13. Expansion telescopic cylindrical block; 14. Telescopic magnet. Detailed Implementation

[0017] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires. Appropriate controllers and encoders should be selected according to the actual situation to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, and will not describe the electrical control further. Example

[0019] Please see Figure 1-3 As a key fluid control component, butterfly valves have revealed numerous defects in their traditional design during long-term use, especially under high-pressure and high-frequency conditions: In terms of positioning and locking, they typically rely on valve stem torque to maintain the position of the butterfly plate, which is prone to sealing failure due to vibration or pressure shock. Existing mechanical limiting structures are also complex and lack sufficient self-locking reliability. In terms of sealing performance, the mainstream "compression" seal has stringent requirements for machining and installation precision, and the sealing ring is prone to wear and aging, leading to internal leakage. Furthermore, there is a lack of effective automatic wear compensation mechanisms. In addition, in terms of automation integration, the locking and sealing processes of existing valves lack effective status feedback, making it difficult to achieve precise control and fault early warning. Therefore, this application protects a positioning connection structure for a butterfly valve stem 2 and a butterfly plate. The butterfly valve body 1 rotates inside the valve body 1, driving multiple rotating shafts 6 on it. These rotating shafts 6 then drive a rotating disc 4 on them, causing the disc 4 to rotate stably horizontally along the valve body 1. The rotating disc 4 drives a plug-in limiting block 9 on it, movably inserting the limiting block 9 into the inner side of a semi-circular telescopic groove 8, thereby limiting the fixed position between the rotating disc 4 and the fixed butterfly plate. An electromagnetic telescopic lock 1 inside the semi-circular telescopic groove 8 further controls this positioning. The expansion and contraction of 0 fixes the insertion limiting block 9. The telescopic electromagnet 12 inside the expansion and compression hole 11 is energized, and the telescopic electromagnet 12 magnetically repels the telescopic magnet 14. The telescopic magnet 14 drives the expansion and contraction cylindrical block 13 on it, thereby making the expansion and contraction cylindrical block 13 stably horizontally expand and contract inside the expansion and compression hole 11. This squeezes the gas inside the expansion and compression hole 11 into the inner side of the sealing airbag 7. The expansion of the sealing airbag 7 expands and seals the space between the fixed disc 3 and the rotating disc 4. In summary, during the opening and locking phases, the butterfly valve stem 2 is driven to rotate, which in turn drives the rotating disc 4 and its insert limiting block 9 to rotate. When the disc reaches the predetermined position, the insert limiting block 9 is precisely embedded in the semi-circular telescopic groove 8 of the fixed disc 3. At this time, the central controller receives the position signal from the position sensor and instructs the drive circuit of the electromagnetic telescopic lock 10 to be energized, causing the locking tongue to extend and insert into the insertion limiting groove of the insert limiting block 9, thus completing the mechanical hard locking. The return spring serves as a safety guarantee in the event of power failure, ensuring that the locking tongue can reliably retract. Next, the sealing execution stage begins. After the locking is confirmed, the central controller energizes the telescopic electromagnet 12, generating a magnetic repulsive force to push the expanding telescopic cylindrical block 13 with the telescopic magnet 14 to move, compressing the space inside the expansion compression hole 11. The compressed gas enters the sealing airbag 7 embedded in the groove of the fixed disc 3 through the channel, causing it to expand under pressure, thereby tightly filling the gap between the two discs and achieving a flexible seal. During this process, the airtightness of the compression chamber is ensured by the sealing ring rubber ring, while the wear-resistant and friction-reducing material layer on the contact surface effectively reduces the wear of the moving parts.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning connection structure for a butterfly valve stem and a butterfly plate, characterized in that, The valve includes a valve body, on the inner side of which a butterfly valve stem, a fixed disc, and a rotating disc are mounted. The fixed disc is mounted on the inner side of the valve body and has multiple fixed shaft tubes. The rotating disc has multiple rotating shaft tubes mounted on it, and the rotating shaft tubes are fixedly connected to the butterfly valve stem. The butterfly valve stem is inserted into the valve body and the multiple fixed shaft tubes via sealed bearings and is connected to the rotating shaft tubes. Sealing airbags are mounted on the fixed disc and the rotating disc. The fixed disc has multiple semi-circular telescopic grooves. The rotating disc is equipped with an insertion limiting block, which is movably inserted into the inner side of the semi-circular telescopic groove. An electromagnetic telescopic lock is formed on the semi-circular telescopic groove. An insertion limiting groove is formed on the insertion limiting block. An expansion and compression hole is formed on the fixed disc. The inner side of the expansion and compression hole is connected to the sealing airbag. An expansion and compression cylindrical block is installed on the inner side of the expansion and compression hole. A sealing ring rubber ring is installed on the expansion and compression cylindrical block. A telescopic magnet is installed on the expansion and compression cylindrical block. A telescopic electromagnet is installed on the inner side of the expansion and compression hole.

2. The positioning connection structure of the butterfly valve stem and butterfly plate according to claim 1, characterized in that, The electromagnetic telescopic lock is equipped with a position sensor and a return spring. The position sensor is used to detect whether the insertion limit block is in place, and the return spring is used to automatically retract the electromagnetic telescopic lock when the power is off.

3. The positioning connection structure of the butterfly valve stem and butterfly plate according to claim 2, characterized in that, The sealing airbag is fitted into an annular groove on the end face of the fixed disc facing the rotating disc.

4. The positioning connection structure of the butterfly valve stem and butterfly plate according to claim 3, characterized in that, A central controller is installed on the valve body, and the central controller is electrically connected to the position sensor of the electromagnetic telescopic lock, the drive circuit of the electromagnetic telescopic lock, and the telescopic electromagnet.

5. The positioning connection structure of the butterfly valve stem and butterfly plate according to claim 4, characterized in that, The contact surfaces of the insert limiting block and the semi-circular telescopic groove, as well as the contact surfaces of the expansion telescopic cylindrical block and the expansion extrusion hole, are all coated with a wear-resistant and friction-reducing material layer.

6. The positioning connection structure of the butterfly valve stem and butterfly plate according to claim 5, characterized in that, The fixed disc also integrates a pressure sensor that communicates with the sealed airbag.

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