Double eccentric butterfly valve with switch position locking

Abstract

The utility model relates to valve structure technical field and disclose a double eccentricity with switch position locked butterfly valve, solved the problem that the valve plate position is unstable in the operation of prior art. The device includes valve plate, drive assembly and locking assembly, through setting up the locking assembly independent of drive assembly at butterfly valve second valve shaft tail end, can lock the valve plate in full open or full close position stably, can pass through optimization fixed block and adaptive groove structure simultaneously, adapts different operation frequency and medium pressure scene, avoids the problem that the gap of valve shaft and drive device produces leakage, improper operation damages drive device for long -term use, prevents butterfly plate accidental closing from producing destructive water hammer when not stopping water on -line replacement drive device to guarantee pipeline safety, and simple structure easy operation is combined double eccentric structure and reduces the wear and tear of valve plate and valve seat, prolongs butterfly valve life, does not interfere with normal flow regulation.

Description

Technical Field

[0001] This utility model relates to the field of valve structure technology, and in particular to a double eccentric butterfly valve with switch position locking. Background Technology

[0002] A butterfly valve is a type of valve whose closing element is a disc that rotates around a valve shaft to open or close. Its main functions in pipelines are to cut off and throttle flow. It typically rotates 90° from fully open to fully closed. To position the butterfly valve disc, a worm gear reducer needs to be installed on the valve stem. This allows the valve disc to stop at any position between 0° and 90°. Through worm gear transmission, the rotational speed is reduced and the output torque is increased, avoiding positional deviations during manual operation. It also allows the valve disc to remain stably in any position, precisely adapting to different flow regulation scenarios.

[0003] Existing technology announcement number CN217208011 U discloses a locking device for a butterfly valve, including a locking device, a valve body, and a valve plate. The valve plate is arc-shaped and disposed inside the valve body. The locking device is located on the left side of the top center of the valve body and near the bottom of the valve plate. The use of a double-eccentric butterfly valve meets the safety requirements of the operating conditions, and the locking device provides double protection. The locking device prevents the valve from over-closing or accidentally opening. Existing technology announcement number CN216407764U also discloses a self-locking mechanism and a double-eccentric butterfly valve, including a first locking member with a locking part and an unlocking part; a locking assembly, spaced apart from the first locking member, including a fixed part and a second locking member disposed on the fixed part; the second locking member can move relative to the fixed part to adapt and connect with the locking part or the unlocking part; when the first locking member moves relative to the locking assembly, the second locking member switches between being connected to the locking part and being connected to the unlocking part.

[0004] The aforementioned and existing related technologies have the following drawbacks: First, after long-term opening and closing operations, the butterfly valve installed in the pipeline is prone to developing a clearance between the valve shaft and the turbine drive unit, causing the butterfly plate and valve seat to shift at an angle, directly leading to media leakage. Second, when dealing with this leakage problem on-site, although the butterfly valve can be restored to its normal closed position by adjusting the limit bolt on the drive unit, improper operation during this process, or increasing the closing torque to forcibly close the valve to curb leakage, can easily damage the turbine drive unit. Finally, when the drive unit is damaged and needs to be replaced online without interrupting water supply, the existing technology lacks a butterfly plate opening and closing position locking function. During the replacement process, the butterfly plate may suddenly close, generating destructive water hammer, ultimately leading to damage to the entire pipeline and causing property loss. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the valve plate position is unstable during operation in the existing technology. To address this, we propose a double eccentric butterfly valve with switch position locking.

[0006] To achieve the above objectives, this application adopts the following technical solution: a double-eccentric butterfly valve with switch position locking, comprising a valve body, a valve plate installed inside the valve body, a drive assembly installed on one side of the valve plate, and a locking assembly installed on the other side of the valve plate; the locking assembly includes a second valve shaft, one end of the second valve shaft is connected to the valve plate, a cross groove is machined on the end face of the other end of the second valve shaft, a locking cover is sleeved on the second valve shaft, a vertical groove is integrally formed on the back of the locking cover facing the valve body, a fixing block is installed in the vertical groove, the width of the vertical groove is adapted to the cross groove, and the fixing block can be embedded in the vertical groove and the cross groove to restrict the rotation of the second valve shaft.

[0007] Preferably, the drive assembly includes a turbine component, a worm gear component is mounted on one side of the turbine component, the turbine component includes a first valve shaft, one end of the first valve shaft is connected to a valve plate, and a turbine disk is mounted on the other end of the first valve shaft. A limit plate is integrally formed on the back of the turbine disk facing the valve body, and a limit bolt is mounted on one side of the limit plate.

[0008] Preferably, the worm gear component includes a worm shaft, a handwheel is mounted on the upper end of the worm shaft, and a helical tooth segment is machined in the middle of the worm shaft, which meshes with the turbine disk.

[0009] Preferably, the first valve shaft and the second valve shaft are coaxially arranged, and the axes of the first valve shaft and the second valve shaft are offset from the geometric center of the valve plate and the axes of the first valve shaft and the second valve shaft are offset from the inner cavity center of the valve body.

[0010] Preferably, the fixing block is a long strip structure with an isosceles trapezoidal cross-section, the cross-shaped groove is adapted to the fixing block, and the vertical groove is adapted to the fixing block.

[0011] Preferably, the fixing block has a long strip structure with a closed ring cross-section, the cross groove cross-section shape is adapted to the fixing block, and the vertical groove cross-section shape is adapted to the fixing block.

[0012] The technical effects and advantages of this utility model are as follows:

[0013] In this invention, a locking component is independently installed at the tail end of the second valve shaft, completely separated from the drive component. This avoids leakage caused by disc offset due to long-term gaps between the valve shaft and the drive device, and also prevents damage to the drive device caused by improper operation or increased closing torque during on-site leak handling. Especially when replacing the drive device online without interrupting water supply, the valve plate can be stably locked in the fully open or fully closed position, eliminating destructive water hammer caused by accidental closure of the disc plate and ensuring pipeline safety. At the same time, by optimizing the structure of the fixing block and the adapter groove for different operating frequencies and media pressure scenarios, the invention can meet the operational convenience of frequent locking scenarios and the locking reliability of high-pressure and large-diameter pipeline conditions. The overall structure is simple and easy to operate. Combined with the double eccentric structure, it reduces wear on the valve plate and valve seat, extends the overall service life of the butterfly valve, ensures long-term stable operation, and does not interfere with normal flow regulation functions. Attached Figure Description

[0014] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts:

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 4 This is a partially enlarged structural schematic diagram of the present invention;

[0019] Figure 5 This is a schematic diagram of the locked fully closed state structure of this utility model;

[0020] Figure 6 This is a schematic diagram of the locked fully open state structure of this utility model;

[0021] Figure 7 This is a schematic diagram of the structure of a locking component according to the present invention;

[0022] Figure 8 This is a schematic diagram of the structure of a locking component according to the present invention;

[0023] Figure 9 This is a structural schematic diagram of a locking component according to the present invention.

[0024] Legend: 1. Valve body; 2. Valve plate; 3. Drive assembly; 31. Turbine component; 311. First valve shaft; 312. Turbine disc; 313. Limiting plate; 314. Limiting bolt; 32. Worm gear component; 321. Helical gear segment; 322. Handwheel; 323. Dustproof housing; 4. Locking assembly; 41. Second valve shaft; 42. Cross groove; 43. Bottom cover; 44. Locking cover; 45. Vertical groove; 46. Fixing block; 5. Flange. Detailed Implementation

[0025] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0026] Example 1

[0027] Reference Figures 1-2 As shown, this utility model provides a technical solution: a double eccentric butterfly valve with switch position locking, including a valve body 1, a valve plate 2 installed inside the valve body 1, a drive assembly 3 installed on one side of the valve body 1, a locking assembly 4 installed on the other side of the valve body, and a flange 5 installed on the outer edge of the valve body 1.

[0028] Reference Figures 1-2 As shown, the valve body 1 has a hollow circular tube structure and is made of QT450-10 ductile iron. The inner cavity of the valve body 1 is polished to reduce the resistance to medium flow. Flanges 5 are fixedly installed on the outer edges of both ends of the valve body 1 by circumferential welding. The material of the flanges 5 is the same as that of the valve body 1. There are 16 evenly distributed bolt holes on the flanges 5 for connecting with the pipe flanges.

[0029] A valve plate 2 is movably mounted on the inner edge of the middle part of the valve body 1. The valve plate is made of 316L stainless steel and coated with a 0.2mm thick polytetrafluoroethylene coating. The valve plate 2 has a disc-shaped structure. An H-shaped protrusion is integrally formed in the middle of the front side. It forms a frame support with the middle crossbeam and the two vertical parts on both sides, which enhances the bending and torsional resistance of the valve plate 2 under pressure conditions. A concave part corresponding to the front crossbeam is opened in the middle of the back side of the valve plate 2. Fixed protrusions are integrally formed on both sides of the concave part. The left fixed protrusion is embedded and connected to the drive component 3, and the right fixed protrusion is embedded and connected to the locking component 4, forming a linkage structure between the valve plate 2, the drive component 3, and the locking component 4.

[0030] Reference Figures 3-4 As shown, the drive assembly 3 includes a turbine component 31 and a worm component 32, which are connected by meshing transmission, and are covered with a dustproof housing 323.

[0031] The turbine component 31 includes a first valve shaft 311, which is forged from 40Cr material and has been quenched. One end of the first valve shaft 311 is embedded in the keyway of the fixing protrusion on the left side of the valve plate 2 via a flat key, and the other end passes through the shaft hole of the valve body 1 and extends to the outside. The turbine disk 312 is connected and installed via a flat key. The turbine disk 312 is integrally formed with a limiting plate 313 facing the back of the valve body 1. A 90° arc groove is provided on the limiting plate 313. A limiting bolt 314 is installed at the corresponding position on the dustproof housing 323. The end of the limiting bolt 314 extends into the arc groove. By adjusting the extension length of the bolt, the rotation range of the valve plate 20-90° can be finely adjusted to avoid interference opening and closing.

[0032] The worm gear component 32 is located on one side of the turbine disk 312 and includes a worm shaft. The worm shaft is also made of 40Cr material and has a helical tooth segment 321 machined in the middle, which meshes with the turbine disk 312 to form a speed reduction transmission. A handwheel 322 is movably mounted on the upper end of the worm shaft through a rolling bearing. The handwheel 322 is made of ABS engineering plastic with a knurled surface, and its lower end is fixed in the bearing seat at the bottom of the dustproof housing 323 through a deep groove ball bearing.

[0033] Manually rotate the handwheel 322 clockwise, and the helical tooth segment 321 drives the turbine disk 312 to rotate at a differential speed, which in turn drives the valve plate 2 to rotate through the first valve shaft 311, thereby achieving the cut-off or throttling of the medium. At the same time, through the cooperation of the limit plate 313 and the limit bolt 314, it is ensured that the valve plate 2 rotates only within the range of 0-90°, avoiding damage to the valve seat due to overtravel.

[0034] Reference Figure 7 As shown, the locking assembly 4 includes a second valve shaft 41 made of 40Cr material. It is coaxially arranged with the first valve shaft 311 to form a double eccentric structure. The valve shaft axis is offset from the geometric center of the valve plate 2 by 8mm and from the center of the inner cavity of the valve body 1 by 10mm, which reduces the squeezing wear between the valve plate and the valve seat when the valve plate is opened and closed. One end of the second valve shaft 41 is embedded in the keyway of the fixing protrusion on the right side of the valve plate 2 by a flat key. The other end has a cross groove 42 machined on its end face. The groove surface of the cross groove 42 is perpendicular to the bottom surface. The bottom cover 43 and the locking cover 44 are sequentially fitted on the outer edge of the middle part of the second valve shaft 41. The bottom cover 43 and the locking cover 44 are fixedly connected by four bolts. The bottom cover 43 and the locking cover 44 have a through hole in the middle. The inner diameter of the through hole is the same as the diameter of the second valve shaft 41.

[0035] The locking cover 44 has a vertical groove 45 integrally formed on the back of the valve body 1. The bottom surface of the vertical groove 45 has two threaded holes. The groove surface of the vertical groove 45 is perpendicular to the bottom surface. A fixing block 46 is installed in the vertical groove 45 by threads. The fixing block 46 has a rectangular cross-section. The width of the vertical groove 45 is the same as that of the cross groove 42. The upper and lower ends of the fixing block 46 are embedded in the vertical groove 45, and the middle part is embedded in the cross groove 42, forming a physical fixation of the second valve shaft 41.

[0036] Reference Figures 5-6 As shown, when the drive assembly 3 leaks due to gaps caused by long-term use, or when the drive assembly needs to be replaced online without interrupting water supply, first rotate the handwheel 322 to adjust the valve plate 2 to the fully closed position, with the valve plate 2 parallel to the flange 5 and the vertical section of the cross groove 42 aligned with the vertical groove 45. Alternatively, adjust the valve plate 2 to the fully open position, with the valve plate 2 orthogonal to the flange 5 and the vertical section of the cross groove 42 aligned with the vertical groove 45. Then screw the fixing block 46 into the vertical groove 45 and the cross groove 42. The fixing block 46 restricts the rotation of the second valve shaft 41, thereby locking the position of the valve plate 2 and preventing accidental closure that could cause destructive water hammer. At the same time, it eliminates the need to rely on the limiting structure of the drive assembly 3, reducing the risk of damage to the drive assembly.

[0037] Example 2

[0038] Reference Figure 8 As shown, this embodiment is basically the same as embodiment 1 in terms of structure, connection relationship and function. The only difference is the structure of the fixing block 46 and the adapter slot of the locking component 4, as detailed below:

[0039] The fixing block 46 is made of 304 stainless steel and has an isosceles trapezoidal long strip structure with the bottom near the valve body 1. Correspondingly, the cross groove 42 and the vertical groove 45 do not have matching isosceles trapezoidal cross sections.

[0040] In this embodiment, there is no need to tighten the bolts when locking. Simply push the fixing block 46 vertically into the vertical groove 45. The self-positioning characteristic of the trapezoidal structure can achieve quick locking. Compared with embodiment 1, the operation time is shortened, which is suitable for scenarios that require frequent locking. At the same time, the contact area of ​​the trapezoidal mating surface is larger, and the stability in the locked state is also better.

[0041] Example 3

[0042] Reference Figure 9 As shown, this embodiment is basically the same as embodiment 1 in terms of structure, connection relationship and function. The only difference is the structure of the fixing block 46 and the adapter slot of the locking component 4, as detailed below:

[0043] The fixing block 46 is made of 2Cr13 stainless steel and has a closed ring structure. Its cross section is composed of two parallel straight sections at the top and bottom and two symmetrical semicircular curved sections on the left and right. Correspondingly, the cross-shaped groove 42 and the vertical groove 45 are perfectly matched with the fixing block 46.

[0044] In this embodiment, the annular structure can disperse the stress concentration of the valve plate 2 under pressure, which is suitable for high-pressure and large-diameter pipeline conditions, and avoids the locking failure caused by the breakage of the fixing block 46 due to excessive local stress. At the same time, the service life is longer than that of Embodiment 1.

[0045] Working principle: The user manually rotates the handwheel 322, and the helical tooth segment 321 of the worm gear component 32 drives the turbine disk 312 to rotate at a reduced speed. The first valve shaft 311 rotates synchronously and drives the valve plate 2 and the second valve shaft 41 to rotate. When the valve plate 2 rotates to the target angle, the handwheel 322 is released. The self-locking characteristic of the worm gear can temporarily fix the position of the valve plate to achieve flow regulation or cut-off. When the drive component 3 needs to be replaced, first rotate the handwheel 322 to adjust the valve plate 2 to the fully open or fully closed position. At this time, the cross groove 42 is aligned with the vertical groove 45. After screwing the fixing block 46 into the vertical groove 45 and the cross groove 42 and tightening the bolt to lock it, the second valve shaft 41 cannot rotate, the position of the valve plate 2 is fixed, and the drive component 3 can be safely removed and replaced. After the drive component 3 is replaced, unscrew the bolt of the fixing block 46 and take out the fixing block 46. Then rotate the handwheel 322 to restore the normal opening and closing function of the valve plate 2.

[0046] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A double-eccentric butterfly valve with switch position locking, characterized in that, Includes a valve body, inside which a valve plate is installed, a drive assembly is installed on one side of the valve plate, and a locking assembly is installed on the other side of the valve plate; The locking assembly includes a second valve shaft, one end of which is connected to a valve plate. A cross groove is machined on the end face of the other end of the second valve shaft. A locking cover is fitted onto the second valve shaft. A vertical groove is integrally formed on the back of the locking cover facing the valve body. A fixing block is installed in the vertical groove. The width of the vertical groove is adapted to the width of the cross groove. The fixing block can be embedded in the vertical groove and the cross groove to restrict the rotation of the second valve shaft.

2. The butterfly valve with double eccentricity and switch position locking according to claim 1, characterized in that: The drive assembly includes a turbine component, a worm gear component mounted on one side of the turbine component, a first valve shaft, one end of the first valve shaft being connected to a valve plate, and a turbine disk being mounted on the other end of the first valve shaft. A limit plate is integrally formed on the back of the turbine disk facing the valve body, and a limit bolt is mounted on one side of the limit plate.

3. A double eccentric butterfly valve with switch position locking according to claim 2, characterized in that: The worm gear component includes a worm shaft, a handwheel is mounted on the upper end of the worm shaft, and a helical tooth segment is machined in the middle of the worm shaft, which meshes with the turbine disk.

4. A double eccentric butterfly valve with switch position locking according to claim 3, characterized in that: The first valve shaft and the second valve shaft are coaxially arranged, and the axes of the first valve shaft and the second valve shaft are offset from the geometric center of the valve plate and the axes of the first valve shaft and the second valve shaft are offset from the inner cavity center of the valve body.

5. A double eccentric butterfly valve with switch position locking according to claim 1, characterized in that: The fixing block is a long strip structure with an isosceles trapezoidal cross-section. The cross-shaped groove is adapted to the fixing block, and the vertical groove is adapted to the fixing block.

6. A double eccentric butterfly valve with switch position locking according to claim 1, characterized in that: The fixing block has a long strip structure with a closed ring cross-section. The cross-shaped groove is adapted to the fixing block, and the vertical groove is adapted to the fixing block.

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