Double eccentric butterfly valve for high frequency applications

Abstract

The application discloses a double eccentric butterfly valve for high frequency application, which comprises a valve body, a butterfly plate installed on the inner side of the valve body, a valve rod structure installed in the butterfly plate, a bearing installed on the top of the outer side of the valve rod structure, the outer side of the bearing connected with the valve body, a packing seal ring installed on the contact point below the valve body, a packing block installed above the bearing, a filler block installed above the packing block, the filler block connected with the valve body through a gland bolt, the outer side of the gland bolt sleeved with a butterfly plate spring, the bottom of the butterfly plate spring installed with a gland nut, and the gland nut exerting pre-tightening force on the gland bolt. When the sealing surface is slightly worn, the system can actively exert dynamic pressure on the packing, realize self-compensation of wear, and the shaft hole is installed with the packing seal ring, so that the risk of internal and external leakage caused by progressive wear is avoided.

Description

Technical Field

[0001] This invention relates to the field of butterfly valves, and in particular to double eccentric butterfly valves for high-frequency applications. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for on / off control of low-pressure pipeline media. A butterfly valve is a type of valve in which the closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing. The double eccentric butterfly valve adopts a double eccentric structure design, which combines the functions of shut-off, connection and flow regulation, and can meet the diverse needs of pipelines in air separation, petrochemical, metallurgical and power systems.

[0003] In the existing technology, double eccentric butterfly valves have been widely used in the industrial field due to their structural advantages. However, in the operation of some equipment, the valve plate needs to be opened and closed frequently, which poses a significant challenge to traditional double eccentric butterfly valves. Specifically, under high-frequency switching conditions, the wear rate of the sealing components is significantly accelerated, which leads to the deterioration of sealing performance and the formation of continuous leakage. This problem not only directly affects the stability of equipment operation, but also greatly prolongs the downtime due to the need for complete disassembly when replacing the valve, which has an adverse impact on production efficiency.

[0004] Therefore, we offer double eccentric butterfly valves for high-frequency applications. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the present invention aims to solve the technical problem of excessively rapid wear of butterfly valves in the prior art under high-frequency switching conditions.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a double eccentric butterfly valve for high-frequency applications, comprising a valve body, and further comprising: A butterfly plate is installed inside the valve body. A valve stem structure is installed inside the butterfly plate. A bearing is installed on the top of the outer side of the valve stem structure. The outer side of the bearing is connected to the valve body. A plug seal ring is installed at the contact point between the bearing and the lower part of the valve body. A valve seat pressure ring is provided on the inner wall of one side wall of the valve body. A soft valve seat is installed on the valve seat pressure ring. When the butterfly plate is closed, it will squeeze the soft valve seat to form a seal. A packing retainer ring is installed above the bearing. A pressure block is installed above the packing retainer ring. The pressure block is connected to the valve body by a pressure cover bolt. A butterfly plate spring is sleeved on the outside of the pressure cover bolt. A pressure cover nut is installed at the bottom of the butterfly plate spring. The pressure cover nut applies a preload force to the pressure cover bolt.

[0008] As a preferred embodiment of the high-frequency double eccentric butterfly valve described in this invention, the valve stem structure includes a valve stem body, an offset rod slidably mounted on the inner wall of the valve stem body, and a pin groove provided on one side of the offset rod.

[0009] As a preferred embodiment of the high-frequency application double eccentric butterfly valve described in this invention, a downward pressure rod is installed on the other side of the misaligned rod, and a top sleeve is installed at the bottom of the downward pressure rod.

[0010] As a preferred embodiment of the high-frequency double eccentric butterfly valve described in this invention, a pin body is installed on the outer side of the valve stem body for use with a pin groove, and a butterfly plate is sleeved on the outer side of the valve stem body.

[0011] As a preferred embodiment of the high-frequency double eccentric butterfly valve described in this invention, a gasket is installed at the bottom of the valve stem body, and a retaining ring is installed on the outer side of the valve stem body above the gasket.

[0012] As a preferred embodiment of the high-frequency application double eccentric butterfly valve described in this invention, an end cap is bolted to the bottom of the valve body, and the end cap fixes the gasket, retaining ring and valve stem structure.

[0013] As a preferred embodiment of the high-frequency application double eccentric butterfly valve described in this invention, a bottom packing is provided between the end cap and the butterfly plate.

[0014] As a preferred embodiment of the high-frequency double eccentric butterfly valve described in this invention, wherein: a packing assembly is installed on the top of the packing retainer ring, the packing assembly is made of polytetrafluoroethylene, and the packing retainer ring adopts an inverted V-shaped structure.

[0015] As a preferred embodiment of the high-frequency double eccentric butterfly valve described in this invention, wherein: a packing gland is installed on the top of the packing assembly, a gland flange is installed on the top of the packing gland, and the gland flange is installed at the bottom of the pressure block.

[0016] In a preferred embodiment of the high-frequency double eccentric butterfly valve described in this invention, a washer is installed on the top of the gland nut, and the washer supports the butterfly plate spring.

[0017] As a preferred embodiment of the high-frequency application double eccentric butterfly valve of the present invention, wherein: a drive structure is installed on the top of the valve body, and the drive structure includes a high-frequency pneumatic actuator.

[0018] As a preferred embodiment of the high-frequency application of the double eccentric butterfly valve described in this invention, the high-frequency pneumatic actuator is equipped with two sets of dual redundant solenoid valves at its top, and each set of dual redundant solenoid valves is connected to a pneumatic control valve below it, and each pneumatic control valve is connected to a filter pressure regulating valve.

[0019] The beneficial effects of this invention are as follows: A pre-tightening pressure mechanism is employed, allowing the system to actively apply dynamic pressure to the packing when slight wear occurs on the sealing surface, achieving wear self-compensation. This mechanism ensures the valve maintains effective sealing during long-term, high-frequency opening and closing. A plug seal ring is installed in the shaft hole to avoid the risk of internal and external leakage caused by progressive wear. The specially designed packing retainer ring uses an inverted V-shaped cross-section, achieving intelligent sealing through gradient pressure distribution. Even if wear occurs at the sealing edge, the inverted V-shaped structure can still maintain a tight fit with the valve body, extending the lifespan of the sealing components to the same period as the valve body. An innovative detachable valve stem design allows for complete overhaul by simply removing the valve stem body during maintenance, without disassembling the valve body. A bottom packing layer is added to the standard sealing system, forming a double sealing barrier and enhancing axial sealing performance. The wear self-compensation of this device and the inverted V-shaped retainer ring form a dynamic sealing closed loop, and the modular design reduces maintenance difficulty, indirectly extending the lifespan of the seals. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments 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. Wherein: Figure 1 This is a front view of the device according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the specific structure of the valve body according to one embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of the valve body according to an embodiment of the present invention; Figure 4 As described in one embodiment of the present invention Figure 3 A schematic diagram of the specific structure of region x; Figure 5 As described in one embodiment of the present invention Figure 3 A detailed structural diagram of the y-region; Figure 6 As described in one embodiment of the present invention Figure 3 A detailed structural diagram of the z-region; Figure 7 As described in one embodiment of the present invention Figure 3 A detailed structural diagram of region v; Figure 8 As described in one embodiment of the present invention Figure 3 A detailed structural diagram of region k; Figure 9This is a detailed schematic diagram of the valve stem structure according to one embodiment of the present invention; Figure 10 This is a schematic diagram of the overall structure of the driving structure according to one embodiment of the present invention.

[0021] In the diagram: 1. Valve body; 2. Butterfly plate; 3. Soft valve seat; 4. Valve stem structure; 4a. Valve stem body; 4b. Offset rod; 4c. Pin groove; 4d. Lower pressure rod; 4e. Top sleeve; 5. Valve seat pressure ring; 6. Pressure plate flange; 7. End cover; 8. Packing gland; 9. Packing retainer ring; 10. Packing assembly; 11. Bearing; 12. Pin body; 13. Bottom packing; 14. Gasket; 15. Retainer ring; 16. Pressure plate bolt; 17. Pressure plate nut; 18. Washer; 19. Spring washer; 20. Butterfly plate spring; 21. Pressure block; 22. Plug seal ring; 23. Drive structure; 23a. High-frequency pneumatic actuator; 23b. Dual redundant solenoid valve; 23c. Pneumatic control valve; 23d. Filter pressure regulating valve. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] 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 those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0025] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0026] Example Reference Figure 1-10This embodiment discloses a double eccentric butterfly valve for high-frequency applications, suitable for high-frequency reciprocating and high-frequency rotating operating conditions. It features stable sealing performance, strong wear compensation capability, long service life, and high operational safety, effectively solving the problems of traditional butterfly valves such as easy loosening, sealing failure, rapid component wear, and poor operational reliability under high-frequency conditions. Specifically, it includes a valve body 1 and a butterfly plate 2, which is installed inside the valve body 1. A valve stem structure 4 is installed inside the butterfly plate 2. A bearing 11 is installed on the top of the outer side of the valve stem structure 4. The outer side of the bearing 11 is connected to the valve body 1. The bearing 11 provides rotational support for the valve stem structure 4, ensuring the coaxiality and smooth operation of the valve stem structure 4 and the butterfly plate 2 during high-frequency rotation. A plug seal ring 22 is installed at the contact point between the bearing 11 and the lower part of the valve body 1. The plug seal ring 22 can effectively avoid the risk of internal and external leakage caused by the gradual wear of components during long-term operation, further improving the overall sealing reliability of the valve. A valve seat pressure ring 5 is provided on the inner wall of one side wall of valve body 1. A soft valve seat 3 is installed on the valve seat pressure ring 5. When the butterfly plate 2 is in the fully closed state, the outer edge of the butterfly plate 2 can tightly squeeze the soft valve seat 3. The end face seal between the butterfly plate 2 and the valve body 1 is achieved through the elastic deformation of the soft valve seat 3, completing the cut-off seal of the valve flow channel. This structure is mainly for achieving precise sealing of the sealing surface of the butterfly plate 2 and preventing media leakage. A packing retainer ring 9 is installed above the bearing 11. The packing retainer ring 9 limits the packing and also serves as the first seal. A pressure block 21 is installed above the packing retainer ring 9. The pressure block 21 can apply constant axial pressure to the packing, packing retainer ring 9, bearing 11 and other components below, effectively solving the problem of poor sealing caused by excessive assembly gaps and loose contact of various components. To improve the overall sealing tightness and thus increase the sealing performance, the pressure block 21 is connected to the valve body 1 through the pressure cover bolt 16. A butterfly spring 20 is sleeved on the outside of the pressure cover bolt 16. The butterfly spring 20 can increase the reverse pressure on the pressure cover nut 17 to avoid the problem of the pressure cover nut 17 loosening. At the same time, it also applies a pre-tightening force. The nut 17 drives the screw to move downward. When the valve stem, packing and other internal components are subjected to high-frequency operation for a long time and generate a small amount of wear, the pre-tightening force of the butterfly spring 20 can achieve adaptive compensation of the sealing gap without manual adjustment and maintenance. The bottom of the butterfly spring 20 is equipped with a pressure cover nut 17. The pressure cover nut 17 applies a pre-tightening force to the pressure cover bolt 16. It needs to be installed with a torque wrench to avoid the situation of manual installation. The valve stem structure 4 includes a valve stem body 4a. A misaligned rod 4b is slidably installed on the inner wall of the valve stem body 4a. The misaligned rod 4b can slide on the valve stem body 4a and extends to the top of the valve stem body 4a, but its height is lower than that of the valve stem body 4a to avoid accidental activation during equipment installation. A pin groove 4c is provided on one side of the misaligned rod 4b, and a pressing rod 4d is installed on the other side of the misaligned rod 4b. A top sleeve 4e is installed at the bottom of the pressing rod 4d. A spring is provided between the pressing rod 4d and the top sleeve 4e to keep the misaligned rod 4b in position. It can only be triggered by direct external pressure. A pin 12 that cooperates with the pin groove 4c is installed on the outer side of the valve stem body 4a. A butterfly plate 2 is sleeved on the outer side of the valve stem body 4a. A gasket 14 is installed at the bottom of the valve stem body 4a. A retaining ring 15 is installed on the outer side of the valve stem body 4a above the gasket 14 to limit the gasket 14 and prevent the gasket 14 from falling off. An end cap 7 is bolted to the bottom of the valve body 1. The end cap 7 secures the gasket 14, retaining ring 15, and valve stem structure 4. Bottom packing 13 fills the space between the end cap 7 and the butterfly plate 2, providing auxiliary sealing at the bottom of the valve and further blocking media leakage. A packing assembly 10 is installed on top of the packing retaining ring 9. The packing assembly 10 is made of polytetrafluoroethylene (PTFE), specifically 3M's TFM1700 material, which has a longer service life compared to traditional materials used in high-frequency reciprocating or rotary motion. The packing retaining ring 9 adopts an inverted V-shaped structure, which achieves intelligent sealing through gradient pressure distribution. Even if the sealing edge wears, the inverted V-shaped structure can still maintain a tight fit with the valve body, preventing leaks. To ensure a continuous sealing effect, a packing gland 8 is installed on the top of the packing assembly 10, and a gland flange 6 is installed on the top of the packing gland 8. The gland flange 6 is installed at the bottom of the pressure block 21. A washer 18 is installed on the top of the gland nut 17, and the washer 18 supports the disc spring 20. A drive structure 23 is installed on the top of the valve body 1. The drive structure 23 includes a high-frequency pneumatic actuator 23a. Two sets of dual redundant solenoid valves 23b are connected to the top of the high-frequency pneumatic actuator 23a, meaning that each set of dual redundant solenoid valves 23b has two valves, which can effectively increase the safety of use. A pneumatic control valve 23c is connected below each set of dual redundant solenoid valves 23b, and each pneumatic control valve 23c is connected to a filter pressure regulating valve 23d.

[0027] This embodiment has the following workflow: During use, the drive structure 23 can be disassembled and the device installed according to the usage environment. After installation, the device can open and close the butterfly plate 2 by rotating the valve stem body 4a. After long-term operation, when the packing assembly 10 and the packing retainer ring 9 wear out, the gland nut 17 applies a preload to the gland bolt 16. At this time, the gland bolt 16 pulls the packing gland 8 and the gland flange 6 to apply pressure to the packing assembly 10 and the packing retainer ring 9. When maintenance is required, the misalignment rod 4b can be pressed. At this time, the pin groove 4c on the misalignment rod 4b will descend. When the pin groove 4c and the pin body coincide, the valve stem body 4a can be pulled out, and personnel can then inspect the entire valve.

[0028] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0029] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A double eccentric butterfly valve for high-frequency applications, comprising a valve body, characterized in that, Also includes: A butterfly plate is installed inside the valve body. A valve stem structure is installed inside the butterfly plate. A bearing is installed on the top of the outer side of the valve stem structure. The outer side of the bearing is connected to the valve body. A plug seal ring is installed at the contact point between the bearing and the lower part of the valve body. A valve seat pressure ring is provided on the inner wall of one side wall of the valve body. A soft valve seat is installed on the valve seat pressure ring. When the butterfly plate is closed, it will squeeze the soft valve seat to form a seal. A packing retainer ring is installed above the bearing. A pressure block is installed above the packing retainer ring. The pressure block is connected to the valve body by a pressure cover bolt. A butterfly plate spring is sleeved on the outside of the pressure cover bolt. A pressure cover nut is installed at the bottom of the butterfly plate spring. The pressure cover nut applies a preload force to the pressure cover bolt.

2. The double eccentric butterfly valve for high-frequency applications according to claim 1, characterized in that: The valve stem structure includes a valve stem body, an offset rod slidably mounted on the inner wall of the valve stem body, and a pin groove provided on one side of the offset rod.

3. The double eccentric butterfly valve for high-frequency applications according to claim 2, characterized in that: A pressure rod is installed on the other side of the misaligned rod, and a top sleeve is installed at the bottom of the pressure rod.

4. The double eccentric butterfly valve for high-frequency applications according to claim 2, characterized in that: A pin that mates with a pin groove is installed on the outer side of the valve stem body, and a butterfly plate is fitted on the outer side of the valve stem body.

5. The double eccentric butterfly valve for high-frequency applications according to claim 2, characterized in that: A gasket is installed at the bottom of the valve stem body, and a retaining ring is installed on the outer side of the valve stem body above the gasket.

6. The double eccentric butterfly valve for high-frequency applications according to claim 1, characterized in that: The bottom of the valve body is bolted with an end cap, which secures the gasket, retaining ring, and valve stem structure.

7. The double eccentric butterfly valve for high-frequency applications according to claim 6, characterized in that: Bottom filler is used to fill the space between the end cap and the butterfly plate.

8. The double eccentric butterfly valve for high-frequency applications according to claim 1, characterized in that: A packing assembly is installed on the top of the packing retainer ring. The packing assembly is made of polytetrafluoroethylene, and the packing retainer ring has an inverted V-shaped structure.

9. The double eccentric butterfly valve for high-frequency applications according to claim 8, characterized in that: The packing assembly is fitted with a packing gland on top, and a gland flange is fitted on top of the packing gland. The gland flange is installed at the bottom of the packing block.

10. The double eccentric butterfly valve for high-frequency applications according to claim 1, characterized in that: A washer is installed on the top of the pressure cap nut, and the washer supports the disc spring.

11. The double eccentric butterfly valve for high-frequency applications according to claim 1, characterized in that: A drive structure is mounted on the top of the valve body, and the drive structure includes a high-frequency pneumatic actuator.

12. The double eccentric butterfly valve for high-frequency applications according to claim 11, characterized in that: The top of the high-frequency pneumatic actuator is connected to two sets of dual-redundant solenoid valves, and each set of dual-redundant solenoid valves is connected to a pneumatic control valve below it. Each pneumatic control valve is connected to a filter pressure regulating valve.

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