A butterfly valve disc and butterfly valve with a pre-depressurization structure

Abstract

This invention proposes a butterfly valve disc and butterfly valve with a pre-relief structure, including a valve disc body. Two mounting portions are provided on one side of the valve disc body, each with a mounting shaft hole. A first valve stem is connected to one of the mounting shaft holes. A ball valve is fixedly mounted on one side of the valve disc body, and a second valve stem is mounted on the ball valve. A first helical gear is connected to the first valve stem, and a second helical gear is connected to the second valve stem. A pressure relief hole communicating with the ball valve is provided on the valve disc body. The first valve stem is rotatably connected to the mounting shaft hole. An arc-shaped guide groove is provided on the outer wall of the first valve stem. A limiting hole corresponding to the guide groove is provided on the mounting portion, and a limiting pin is connected to the limiting hole. The limiting pin extends into the guide groove. When the valve is opened, the first valve stem is rotated. Initially, the limiting pin moves within the guide groove, and the first valve stem does not drive the valve disc body to rotate. At this time, the first valve stem drives the second valve stem to rotate via the helical gear, opening the ball valve and relieving pressure.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, and specifically to a butterfly valve disc and butterfly valve with a pre-depressurization structure. Background Technology

[0002] A butterfly valve is a commonly used type of valve. It mainly consists of a valve body, a valve disc (butterfly plate), a valve stem, and an operating mechanism.

[0003] Valve body: Typically circular, providing a fluid passage and support for mounting other components. Butterfly plate: Disc-shaped, resembling a butterfly wing, hence the name "butterfly valve." The butterfly plate rotates within the valve body, controlling fluid flow by changing its angle with the fluid passage. Valve stem: Connects the butterfly plate to the operating mechanism, transmitting the operating force to rotate the butterfly plate. Operating mechanism: Controls the opening and closing of the butterfly valve; it can be a manually operated handle, a worm gear mechanism, or an automatic operating device such as an electric or pneumatic actuator.

[0004] The working principle of a butterfly valve is based on the rotational motion of a butterfly plate. When the butterfly plate is parallel to the fluid passage, the valve is fully open, and the fluid can pass through the valve without obstruction; when the butterfly plate rotates to be perpendicular to the fluid passage, the valve is closed, preventing fluid flow.

[0005] When a butterfly valve is closed and the internal pressure at the inlet is high, a pressure difference occurs between the two sides. The high pressure at the inlet exerts a significant pressure on the butterfly plate, causing it to press tightly against the valve seat, increasing the friction and sealing force between the butterfly plate and the valve seat. Simultaneously, the pressure difference also generates a torque on the butterfly plate, keeping it closed and hindering its opening. Difficulty in opening the butterfly plate significantly complicates valve operation, potentially requiring greater force or tools. This not only increases the operator's workload but may also prolong operation time, impacting the normal operation of the system. Summary of the Invention

[0006] In view of the problems pointed out in the background art, the present invention proposes a butterfly valve disc and a butterfly valve with a pre-depressurization structure to solve the above-mentioned technical problems.

[0007] The technical solution of this invention is implemented as follows:

[0008] A butterfly valve disc with a pre-depressurization structure includes a valve disc body. Two mounting portions are provided on one side of the valve disc body, and the two mounting portions are correspondingly arranged about the center of the valve disc body. Each mounting portion has a mounting shaft hole, and a first valve stem is connected in one of the mounting shaft holes. A ball valve is fixedly installed on one side of the valve disc body, and a second valve stem is provided on the ball valve. A first helical gear is connected to the first valve stem, and a second helical gear is connected to the second valve stem. The first and second helical gears mesh with each other. A pressure relief hole communicating with the ball valve is provided on the valve disc body.

[0009] The first valve stem is rotatably connected to the mounting shaft hole. An arc-shaped guide groove is provided on the outer side wall of the first valve stem. A limiting hole corresponding to the guide groove is provided on the mounting part. A limiting pin is connected in the limiting hole and extends into the guide groove.

[0010] The present invention is further configured such that there are two ball valves, which are respectively located on both sides of the first valve stem, and the second helical gears on the two second valve stems respectively mesh with the first helical gear on the first valve stem.

[0011] The present invention is further configured such that the ball valve is provided with a fixing seat, and the fixing seat is fixedly connected to the valve disc body by screws.

[0012] The present invention is further configured such that the outlet end of the ball valve is provided with an outlet pipe, and the outlet pipe passes through the pressure relief hole.

[0013] The present invention is further configured such that a fastening nut is threaded onto the liquid outlet pipe.

[0014] The invention is further configured such that the first valve stem passes through the mounting shaft holes on the two mounting parts, and the two mounting parts are respectively provided with limiting holes, and the first valve stem is provided with guide grooves corresponding to the limiting holes.

[0015] The present invention is further configured such that the fixing seat is in a sealed connection with the valve disc body.

[0016] The invention is further configured to include a cover, wherein the cover and the valve disc body form a sealed space, and the ball valve, the first helical gear, and the second helical gear are all located within the sealed space. The inlet end of the ball valve is provided with an inlet pipe, which extends out from the side wall of the cover and is threaded with a fastening nut.

[0017] The present invention is further configured such that the mounting part and the valve disc body are separately configured, the mounting part and the cover are integrally configured, and the ball valve is fixedly connected to the cover.

[0018] A butterfly valve includes a valve body, wherein the valve body is provided with the aforementioned butterfly valve disc.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0020] The butterfly valve disc and butterfly valve with a pre-depressurization structure provided by this invention, when opening the valve: The first valve stem is rotated, and initially the limiting pin moves within the guide groove. The first valve stem does not drive the valve disc body to rotate. At this time, the first valve stem drives the second valve stem to rotate via a helical gear, opening the ball valve and releasing pressure. As the first valve stem continues to rotate, the limiting pin moves to the end of the guide groove. At this time, the first valve stem drives the valve disc body to rotate via the limiting pin, opening the butterfly valve. When closing the valve, the first valve stem first idles, driving the second valve stem to rotate, closing the ball valve. Then, the first valve stem drives the valve disc body to rotate, closing the butterfly valve. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the butterfly valve disc of the present invention. Figure 1 .

[0023] Figure 2 This is a side view of the butterfly valve disc of the present invention.

[0024] Figure 3 For the present invention Figure 2 AA section view in the image.

[0025] Figure 4 For the present invention Figure 2 BB section view in the middle.

[0026] Figure 5 For the present invention Figure 2 CC section view in the image.

[0027] Figure 6 This is a schematic diagram of the structure of the butterfly valve disc of the present invention. Figure 2 .

[0028] Figure 7 This is an exploded view of the butterfly valve disc of the present invention.

[0029] Figure 8 This is a schematic diagram of the valve body of the present invention.

[0030] Figure 9 This is a schematic diagram of the structure of the cover body of the present invention being mounted on the valve disc body.

[0031] Figure 10 This is a schematic diagram of the structure of the cover, mounting part, valve body, and first valve stem of the present invention. Figure 1 .

[0032] Figure 11 This is a schematic diagram of the structure of the cover, mounting part, valve body, and first valve stem of the present invention. Figure 2 .

[0033] Figure 12 This is a schematic diagram of the butterfly valve of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] For reference as follows Figures 1-12 The present invention will be described as follows:

[0036] Example: A butterfly valve disc with a pre-depressurization structure includes a circular disc body 1, which is the main component of the butterfly valve to realize the opening and closing functions.

[0037] Two mounting parts 2 are provided on one side of the valve disc body 1. The mounting parts 2 are plate-shaped structures and are set perpendicular to the valve disc body 1. The two mounting parts 2 are set about the center of the valve disc body 1, which makes the structure more symmetrical and balanced, and provides support for connecting the first valve stem 3.

[0038] The mounting part 2 is provided with a mounting shaft hole, one of which is connected to a first valve stem 3, so that the first valve stem can be connected to the valve disc body and rotated.

[0039] A ball valve 4 is fixedly mounted on one side of the valve disc body 1 (the ball valve provides a pre-pressure relief function for this butterfly valve disc). A second valve stem 5 is mounted on the ball valve 4, used to open and close the ball valve 4. The first valve stem 3 and the second valve stem 5 are arranged perpendicularly to each other. A first helical gear 6 is connected to the first valve stem 3, and a second helical gear 7 is connected to the second valve stem 5. The first helical gear 6 and the second helical gear 7 mesh, and the rotation of the first valve stem 3 drives the second valve stem 5 through the first helical gear 6 and the second helical gear 7. A pressure relief hole 8 communicating with the ball valve 4 is provided on the valve disc body 1.

[0040] The first valve stem 3 is rotatably connected to the mounting shaft hole. An arc-shaped guide groove 9 is provided on the outer side wall of the first valve stem 3. The guide groove 9 is arranged along the circumferential direction of the first valve stem 3. The mounting part 2 is provided with a limiting hole 10 that corresponds to and communicates with the guide groove 9. A limiting pin 11 is connected in the limiting hole 10 and extends into the guide groove 9.

[0041] When the valve body 1 in its closed state is to be opened, the first valve stem 3 is rotated. Initially, the first valve stem 3 rotates freely, and the limiting pin 11 moves within the guide groove 9. At this time, the first valve stem 3 drives the second valve stem 5 to rotate, and the ball valve 4 opens, allowing pressure to be released first through the pressure relief hole 8. The first valve stem 3 continues to rotate, and when the first valve stem 3 rotates until the limiting pin 11 abuts against one end of the guide groove 9, the first valve stem 3 drives the valve body 1 to rotate through the limiting pin 11, and the valve body 1 gradually opens. Because pressure has been released first through the ball valve 4 and the pressure relief hole 8, the pressure at the inflow end of the valve body 1 is reduced, making it easier for the valve body 1 to open.

[0042] The structure of guide groove 9 and limiting pin 11 plays a role in controlling the opening sequence. During the opening of valve disc body 1, the first valve stem 3 initially rotates freely, and the limiting pin 11 moves within the guide groove 9. At this time, only the ball valve 4 is opened to release pressure. When the first valve stem 3 rotates until the limiting pin 11 abuts against one end of the guide groove 9, the first valve stem 3 drives the valve disc body 1 to rotate and open through the limiting pin 11.

[0043] Working principle:

[0044] To open the valve body 1, which is in the closed state, first rotate the first valve stem 3. Initially, due to the movement of the limiting pin 11 within the guide groove 9, the first valve stem 3 idles but drives the second valve stem 5 to rotate, thus opening the ball valve 4. Pressure is released through the pressure relief hole 8, reducing the pressure at the inflow end of the valve body 1. As the first valve stem 3 continues to rotate, when the limiting pin 11 abuts against one end of the guide groove 9, the first valve stem 3 begins to drive the valve body 1 to rotate via the limiting pin 11, and the valve body 1 gradually opens.

[0045] Pre-pressure relief function: By combining ball valve 4 and pressure relief hole 8, pressure is relieved before opening valve disc body 1, so that the pressure at the inflow end of valve disc body 1 is reduced. This solves the problem that the valve disc is difficult to open under high pressure differential in traditional butterfly valves, reduces the difficulty of operation, and improves the reliability and safety of the valve.

[0046] Orderly operation: The design of the guide groove 9 and the limiting pin 11 ensures orderly operation. The pressure is released first and then the valve body 1 is opened, avoiding problems that may be caused by improper operation and improving the accuracy and stability of operation.

[0047] Ball valve 4 is a common and widely used type of ball valve, chosen based on factors such as cost, reliability, and availability. Except for the internal ball and seat, the other components of ball valve 4 are made of plastic. Plastic is generally much lighter than metal, which helps reduce the overall weight of the valve disc. Some plastics have good corrosion resistance, allowing them to be used in corrosive media environments and extending the service life of the ball valve.

[0048] Two ball valves 4 are provided, located on either side of the first valve stem 3. The second helical gears 7 on the two second valve stems 5 mesh with the first helical gear 6 on the first valve stem 3. This design of having two ball valves 4 increases the reliability and efficiency of pressure relief. When one ball valve malfunctions or becomes blocked, the other ball valve can continue to operate, ensuring the normal functioning of pressure relief. Simultaneously, the two ball valves can share the fluid pressure, reducing the load on a single ball valve and extending its service life. The symmetrical layout of the two ball valves on either side of the first valve stem 3 makes the structure more stable and balanced. During operation, the force on both sides of the first valve stem 3 is more even, reducing the risk of deformation or damage caused by uneven force. The second helical gears 7 on the two second valve stems 5 mesh with the first helical gear 6 on the first valve stem 3, enabling the first valve stem 3 to simultaneously drive the two second valve stems 5. This transmission method ensures the synchronous opening and closing of the two ball valves, improving the accuracy and stability of operation.

[0049] When the first valve stem 3 is rotated, the first helical gear 6 rotates accordingly. Through meshing with the two second helical gears 7, it simultaneously drives the two second valve stems 5 to rotate, thereby opening the two ball valves 4 at the same time. The fluid is depressurized through the pressure relief hole 8 on the valve disc body 1, which communicates with the ball valve 4. After depressurization is completed, the first valve stem 3 is rotated again, which drives the valve disc body 1 to open through the limiting pin 11, allowing the fluid to flow.

[0050] Improved pressure relief efficiency: The dual ball valves increase the area of ​​the pressure relief channel, accelerating the pressure relief speed and allowing the pressure at the inflow end of valve body 1 to decrease more quickly, thus making it easier to open valve body 1. Enhanced reliability: The dual ball valve design improves the reliability of the entire pre-pressure relief structure. Even if one ball valve fails, the other ball valve can continue to operate, ensuring that the butterfly valve disc can operate normally when pressure relief is required. Operational stability: Helical gear transmission ensures synchronous operation of the two ball valves, avoiding pressure imbalance caused by inconsistent opening of a single ball valve, thus improving operational stability and safety.

[0051] The ball valve 4 is equipped with a fixed seat 12, which is plate-shaped and perpendicular to the inlet direction of the ball valve 4. The fixed seat 12 has connection holes at its four corners. The fixed seat 12 is fixedly connected to the valve disc body 1 by screws. The valve disc body 1 has threaded holes corresponding to the connection holes; these threaded holes are blind holes. This design provides stable support and fixation for the ball valve 4, ensuring that the ball valve will not shift or loosen due to fluid impact during operation. The connection method is simple, reliable, and easy to install and disassemble. The function of the fixed seat 12 is to firmly fix the ball valve 4 to the valve disc body 1, ensuring the stability and reliability of the ball valve during operation. It prevents the ball valve from loosening or falling off due to vibration, fluid impact, or other factors, thus affecting the normal operation of the pre-pressure relief function.

[0052] The ball valve 4 has a discharge pipe 13 at its outlet end. The discharge pipe 13 passes through the fixed seat 12 and the pressure relief hole 8. The outer diameter of the discharge pipe 13 is equal to the inner diameter of the pressure relief hole 8. A fastening nut 14 is threaded onto the discharge pipe 13. The valve disc body 1 is located between the fastening nut 14 and the fixed seat 12. The fastening nut 14 is tightened and abuts against the valve disc body 1, fixing the ball valve 4 onto the valve disc body 1. The discharge pipe 13 at the outlet end of the ball valve 4 passes through the fixed seat 12 and the pressure relief hole 8. The discharge pipe connects the ball valve to the external space of the valve disc body, allowing the fluid after pressure relief by the ball valve to be smoothly discharged. At the same time, the specific size design of the discharge pipe ensures a tight fit with the pressure relief hole. The outer diameter of the outlet pipe 13 is equal to the inner diameter of the pressure relief hole 8. This design allows the outlet pipe to fit tightly against the pressure relief hole, preventing fluid leakage from the gap between the outlet pipe and the pressure relief hole during pressure relief, thus ensuring the sealing and reliability of the pressure relief system. The fastening nut 14 is threaded onto the outlet pipe 13, and the valve disc body 1 is located between the fastening nut 14 and the fixing seat 12. When the fastening nut 14 is tightened and abuts against the valve disc body 1, the ball valve 4 is securely fixed to the valve disc body 1. This fixing method is simple and effective, ensuring that the ball valve will not loosen or fall off due to vibration or fluid pressure during operation. The fastening nut further enhances the connection stability between the ball valve and the valve disc body. During the operation of the butterfly valve, especially under conditions of large fluid pressure changes, the fastening nut can withstand certain axial and radial forces, ensuring the ball valve remains in place and thus guaranteeing the normal operation of the pressure relief system.

[0053] The first valve stem 3 passes through the mounting shaft holes on the two mounting parts 2. Each mounting part 2 has a limiting hole 10, and the first valve stem 3 has a guide groove 9 corresponding to the limiting hole 10. This mounting method provides stable support and a rotation axis for the first valve stem. The two mounting parts make the first valve stem rotate more smoothly, reducing the possibility of wobbling and deviation.

[0054] The fixed seat 12 is attached to the valve disc body 1 to form a sealed connection, and a sealing gasket can be placed between the fixed seat 12 and the valve disc body 1. This sealed connection effectively prevents fluid leakage at the connection between the ball valve 4 and the valve disc body 1. For butterfly valve discs with a pre-depressurization structure, the sealed connection is crucial. Only by ensuring the seal between the fixed seat 12 and the valve disc body 1 can the fluid be smoothly depressurized through the outlet pipe 13 and the pressure relief hole 8 after the ball valve 4 is opened, thereby reducing the pressure at the inflow end of the valve disc body 1 and making it easier to open. Placing a sealing gasket between the fixed seat 12 and the valve disc body 1 further enhances the sealing effect. Sealing gaskets are typically made of materials with good elasticity and sealing properties, such as rubber and silicone.

[0055] The system also includes a housing 15, which, together with the valve disc body 1, forms a sealed space. The ball valve 4, the first helical gear 6, and the second helical gear 7 are all located within this sealed space. The inlet end of the ball valve 4 is equipped with an inlet pipe 16, which extends through the side wall of the housing 15. The side wall of the housing 15 has holes for the inlet pipe 16 to pass through, and holes for the first valve stem 3 to pass through. A fastening nut 14 is threaded onto the inlet pipe 16. The housing 15 is a shell structure with an opening facing the valve disc body 1, forming a sealed space together with the valve disc body 1. This structural design allows the housing to fit tightly against the valve disc body, forming an effective seal. The side wall of the housing 15 has holes for the inlet pipe 16 and the first valve stem 3 to pass through. The dimensions of these holes match the inlet pipe and the first valve stem, ensuring the sealing of the space without affecting their normal operation. The sealed space protects the ball valve 4, the first helical gear 6, and the second helical gear 7. The sealed space reduces the impact of external interference on the ball valve and helical gear transmission system, ensuring their operational stability and reliability. The inlet pipe 16 extends from the side wall of the cover 15, connecting the inlet end of the ball valve to the external pipeline. A fastening nut 14 is threaded onto the inlet pipe; tightening the fastening nut presses the cover onto the valve disc body 1, forming a sealed connection. The fastening nut not only secures the cover but also enhances the sealing performance between the cover and the valve disc body by applying pressure. Ensuring the integrity of the sealed space further improves the protection of internal components. The sealed space formed by the cover 15 and the valve disc body 1, along with the fastening nut on the inlet pipe, work together to provide effective protection for internal components such as the ball valve and helical gears, ensuring the stable operation and long service life of the butterfly valve disc.

[0056] The side wall of the housing 15 has a hole through which the inlet pipe 16 and the first valve stem 3 pass. This hole is prone to leakage. High-performance sealing gaskets can be used at the contact points between the hole and the inlet pipe and the first valve stem. For example, highly corrosion-resistant and elastic rubber gaskets or PTFE gaskets can be used. These gaskets can deform under pressure, filling gaps and forming a good seal. For the inlet pipe, a gasket compatible with the pipe material can be selected to ensure consistent sealing performance under different operating pressures and temperatures. For the first valve stem, a self-lubricating gasket can be selected to reduce friction during valve stem rotation while ensuring a good seal. Before installing the inlet pipe, sealant can be applied around the hole. The sealant fills tiny gaps and forms a strong sealing layer after curing. A sealing sleeve can be installed on the inlet pipe, fitting tightly to the hole in the housing. The sealing sleeve can be made of an elastic material, achieving a seal through compression deformation. A sealing ring can be installed at the contact point between the valve stem and the hole in the first valve stem. The sealing ring can be made of wear-resistant and corrosion-resistant materials, such as graphite or polytetrafluoroethylene (PTFE), and prevents leakage through a tight fit with the valve stem. For the inlet pipe, the tapered orifice allows the sealing material to be gradually compressed during pipe insertion, forming a better seal. For the first valve stem, the stepped orifice allows for the installation of multiple sealing rings, improving the sealing effect.

[0057] The mounting part 2 and the valve disc body 1 are separate components, while the mounting part 2 and the cover 15 are integrated. The ball valve 4 is fixedly connected to the cover 15. This technical solution facilitates the installation of the cover 15, ball valve 4, and first valve stem 3 within the valve body 17. The mounting part 2, cover 15, ball valve 4, and first valve stem 3 can be assembled into a single structure before being installed into the valve body. This integrated structure is then installed with the valve disc body 1 and finally inserted into the valve body 17. This integrated structure makes installation into the valve body 17 more convenient and faster, reducing the difficulty of complex installation operations inside the valve body. Compared to the traditional method of installing individual components inside the valve body, this integrated installation method greatly improves installation efficiency. Because the ball valve 4 and first valve stem 3 are connected to the cover 15 first, the sealing structure can be installed before being installed into the valve body. This allows for sealing in a more spacious and convenient operating environment, ensuring the quality and reliability of the seal. It allows for easier installation of sealing materials such as gaskets and sealants, or the adoption of more complex sealing structure designs, without the inconvenience of operating in the narrow space inside the valve body.

[0058] The overall structure allows for precise assembly and debugging before installation, ensuring accurate positional relationships between all components. This ensures better fit between the valve disc body 1 and other components after valve body 17 is installed, improving valve performance and sealing. If maintenance or replacement of the ball valve 4, first valve stem 3, or cover 15 is required during use, they can be easily disassembled and installed as a single unit connected to the valve disc body 1. This reduces maintenance time and costs, improving valve availability. The integrated mounting section 2 and cover 15, along with the fixedly connected ball valve 4 and cover 15, make the entire structure more stable and reliable. During valve operation, it can better withstand fluid pressure and external forces, reducing the risk of leakage and malfunction due to component loosening or displacement. This technical solution, by separating the mounting section 2 from the valve disc body 1, integrating the mounting section 2 and cover 15, and fixing the ball valve 4 to the cover 15, brings numerous conveniences to the installation and sealing structure of the butterfly valve, improving installation efficiency, accuracy, and reliability.

[0059] When using the cover 15, the screw fixing structure between the fixing seat 12 and the valve disc body 1 is not required. Instead, the cover 15 and the ball valve 4 are fixed using the fastening nuts 14 on the two outlet pipes 13. The fastening nuts 14 on the inlet pipe 16 are also not used. Eliminating the screw fixing structure between the fixing seat and the valve disc body reduces the number of parts used and makes the overall structure simpler. This reduces the number of operation steps and required tools during installation and maintenance, improving work efficiency. Using the fastening nuts on the two outlet pipes to fix the cover and the ball valve concentrates the fixing point at the outlet pipe. This method allows for a more even distribution of force, improving the stability of the fixation. It also facilitates adjustment and alignment during installation, ensuring accurate positioning of the cover and the ball valve. During installation, first assemble the ball valve and the cover, ensuring a good seal between them. Then, pass the outlet pipe through the corresponding hole on the valve disc body and tighten the fastening nut. During tightening, care should be taken to apply moderate force, ensuring a secure fixation without over-tightening and damaging the components. To ensure a tight seal, gaskets or sealant can be used to seal the contact area between the outlet pipe and the valve body. This further enhances the seal and prevents fluid leakage. Since the fastening nut on the inlet pipe is no longer used, special treatment is required at the connection between the inlet pipe and the cover to ensure a tight seal. This can be achieved through welding, bonding, or other methods, followed by a sealing test to ensure no leakage.

[0060] A butterfly valve includes a valve body 17, characterized in that: the valve body 17 contains the aforementioned butterfly valve disc; a first valve stem 3 is circumferentially rotatably connected to the valve body; the first valve stem 3 is axially fixedly connected to the valve body; and a valve seat that mates with the valve disc body 1 is provided within the valve body. The butterfly valve disc includes a circular valve disc body 1, a mounting portion 2, a first valve stem 3, a ball valve 4, a second valve stem 5, a first helical gear 6, a second helical gear 7, a pressure relief hole 8, and other components. This valve disc has a pre-pressure relief structure, allowing pressure to be released via the ball valve before opening the butterfly valve, making the valve disc easier to open. The first valve stem 3 is circumferentially rotatably connected to the valve body, meaning that the first valve stem can rotate around its own axis on the valve body. This rotatable connection allows the operator to control the opening and closing of the butterfly valve disc by rotating the first valve stem. The first valve stem is axially fixedly connected to the valve body, meaning that the first valve stem cannot move axially, only rotate. This fixing method ensures the stability of the first valve stem during operation, preventing axial displacement that could affect the normal operation of the valve.

[0061] Working principle:

[0062] When the butterfly valve needs to be opened, the first valve stem 3 is rotated. The rotation of the first valve stem drives the second valve stem 5 of the ball valve 4 via a helical gear transmission, thus opening the ball valve. Fluid is depressurized through the pressure relief hole 8 on the valve disc body 1, reducing the pressure at the inflow end of the valve disc body. As the first valve stem continues to rotate, when the limiting pin abuts against one end of the guide groove, the first valve stem drives the valve disc body 1 to rotate via the limiting pin, causing the valve disc body to separate from the valve seat, thus opening the butterfly valve. When the butterfly valve needs to be closed, the first valve stem is rotated in the opposite direction, causing the valve disc body to gradually approach the valve seat and eventually fit tightly against it, forming a seal.

[0063] Advantages:

[0064] Pre-pressure relief function: The design of the ball valve and pressure relief hole allows for pressure relief before opening the butterfly valve, reducing operational difficulty and improving its reliability and safety. Especially under high pressure differential conditions, it effectively prevents the valve disc from being difficult to open. Compact structure: The butterfly valve's components are rationally designed, resulting in a compact structure and small footprint. The valve body, valve disc body, and first valve stem fit tightly together, effectively controlling the fluid. Convenient operation: The circumferential rotational connection and axial fixed connection between the first valve stem and the valve body make operation more convenient and faster. Operators can easily control the opening and closing of the butterfly valve by rotating the first valve stem, improving work efficiency. The angle of the circumferential guide groove of the first valve stem needs to be determined based on specific design requirements and usage scenarios.

[0065] If the guide groove angle is small, the initial stage of the ball valve opening for pressure relief will be relatively short when the valve body is opened. This may result in insufficient pressure relief before the valve body enters the rotation and opening stage, increasing the difficulty of opening the valve and potentially causing a large pressure shock to the valve structure.

[0066] If the guide groove angle is large, although it can ensure sufficient time for pressure relief, it may make the entire opening process too long, affecting operational efficiency. At the same time, a larger angle may occupy more space, which will impose certain limitations on the overall structural design of the valve.

[0067] Generally, the angle of the guide groove needs to take into account the following factors: Fluid pressure: If the fluid pressure is high, a larger guide groove angle may be required to ensure sufficient pressure relief. Operating speed requirements: If a high valve opening speed is required, the guide groove angle should not be too large. Valve size and structure: The overall size and structural layout of the valve must be considered to ensure that the guide groove angle does not affect the installation and operation of other components.

[0068] Considering that the opening angle of the ball valve 4 is 90 degrees, the angle of the guide groove 9 in the circumference of the first valve stem 3 can also be set to 90 degrees.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A butterfly valve disc with a pre-relief structure, comprising a valve disc body (1), wherein two mounting portions (2) are provided on one side of the valve disc body (1), the two mounting portions (2) are correspondingly arranged about the center of the valve disc body (1), and the mounting portions (2) are provided with mounting shaft holes, wherein a first valve stem (3) is connected in one of the mounting shaft holes, characterized in that: A ball valve (4) is fixedly installed on one side of the valve body (1). A second valve stem (5) is provided on the ball valve (4). A first helical gear (6) is connected to the first valve stem (3). A second helical gear (7) is connected to the second valve stem (5). The first helical gear (6) and the second helical gear (7) mesh. A pressure relief hole (8) communicating with the ball valve (4) is provided on the valve body (1). The first valve stem (3) is rotatably connected to the mounting shaft hole. An arc-shaped guide groove (9) is provided on the outer side wall of the first valve stem (3). The mounting part (2) is provided with a limiting hole (10) corresponding to the guide groove (9). A limiting pin (11) is connected in the limiting hole (10). The limiting pin (11) extends into the guide groove (9). The mounting part (2) also includes a cover (15). The cover (15) and the valve disc body (1) form a sealed space. The ball valve (4), the first helical gear (6), and the second helical gear (7) are all located in the sealed space. The inlet end of the ball valve (4) is provided with an inlet pipe (16). The inlet pipe (16) passes through the side wall of the cover (15). A fastening nut (14) is threaded on the inlet pipe (16). The mounting part (2) and the valve disc body (1) are set separately. The mounting part (2) and the cover (15) are set as one piece. The ball valve (4) is fixedly connected to the cover (15).

2. The butterfly valve disc with a pre-depressurization structure according to claim 1, characterized in that: The ball valve (4) is provided in two parts, and the two ball valves (4) are located on both sides of the first valve stem (3). The second helical gears (7) on the two second valve stems (5) respectively mesh with the first helical gears (6) on the first valve stem (3).

3. The butterfly valve disc with a pre-depressurization structure according to claim 1, characterized in that: The ball valve (4) is provided with a fixing seat (12), which is fixedly connected to the valve disc body (1) by screws.

4. The butterfly valve disc with a pre-depressurization structure according to claim 1, characterized in that: The ball valve (4) has an outlet pipe (13) at its outlet end, and the outlet pipe (13) passes through the pressure relief hole (8).

5. The butterfly valve disc with a pre-depressurization structure according to claim 4, characterized in that: The outlet pipe (13) is threaded with a fastening nut (14).

6. The butterfly valve disc with a pre-depressurization structure according to claim 1, characterized in that: The first valve stem (3) passes through the mounting shaft holes on the two mounting parts (2), and the two mounting parts (2) are respectively provided with limiting holes (10). The first valve stem (3) is provided with a guide groove (9) corresponding to the limiting hole (10).

7. The butterfly valve disc with a pre-depressurization structure according to claim 3, characterized in that: The fixed seat (12) is sealed to the valve disc body (1).

8. A butterfly valve, comprising a valve body (17), characterized in that: The valve body (17) is provided with a butterfly valve disc as described in any one of claims 1-7.

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