Dustproof butterfly valve

Abstract

The utility model relates to butterfly valve technical field especially is a dustproof butterfly valve, is equipped with the valve seat between the front valve body and rear valve body, the inside of valve seat is equipped with the butterfly plate, the upper and lower ends of butterfly plate are connected with the valve rod, the upper and lower ends of front valve body, rear valve body and valve seat all are seted up and are used to accommodate the rotation hole of valve rod, the inner arc surface of valve seat is equipped with the sealing assembly symmetrically, sealing assembly includes rubber sealing piece, rubber sealing piece and valve seat coaxial arrangement, the inner arc surface of valve seat sets up and installs the arc groove, and installation arc groove and rubber sealing piece are adapted, and rubber sealing piece is clamped in installation arc groove, and the inside edge of rubber sealing piece is round angle setting, in the utility model, sealing assembly can provide the even support and the balanced transmission's reset force of all around to sealing piece, can avoid the dust through the small gap between sealing piece and butterfly plate when valve is closed and form invasion and cause the valve rod jam and accelerate sealing piece wear and tear.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically a dustproof butterfly valve. Background Technology

[0002] A butterfly valve is a type of valve that controls the flow and flow rate of fluid by rotating a butterfly plate. It is widely used in various fields. Its core function is to regulate or cut off the medium in the pipeline. Its basic structure consists of a valve body, a butterfly plate, a valve stem, a sealing element, and a drive device. The drive device drives the valve stem to rotate, and the valve stem rotates the butterfly plate in the valve body. The flow rate can be precisely controlled by adjusting the angle of the butterfly plate.

[0003] Compared to gate valves and ball valves, butterfly valves have advantages such as compact structure, rapid opening and closing, low flow resistance, and convenient maintenance. They can also be adapted to large-diameter pipelines. They are key equipment for achieving convenient fluid control in industrial and civil pipeline systems, and directly affect the system's operating efficiency and safety.

[0004] Traditional butterfly valves mostly rely on the interference fit between the rubber seal and the butterfly plate to achieve sealing. They lack a uniform support structure for the seal and a reset component that can evenly transmit the reset force. This makes it difficult for the seal to obtain a stable support force and reset force throughout the circumference when the valve is closed. Affected by gravity, butterfly plate compression angle deviation, etc., the seal is prone to forming a small gap with the butterfly plate due to uneven local force. Dust intrusion will cause the valve stem to jam and accelerate the wear of the seal, further widening the gap and forming a vicious cycle of "dust intrusion - widening of sealing gap - more serious dust intrusion". Therefore, a dustproof butterfly valve is proposed to address the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a dustproof butterfly valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A dustproof butterfly valve includes a front valve body and a rear valve body, with a valve seat between the front and rear valve bodies. A butterfly plate is located inside the valve seat, and valve stems are connected to the upper and lower ends of the butterfly plate. Rotary holes for accommodating valve stem rotation are provided at the upper and lower ends of the front valve body, rear valve body, and valve seat. A sealing assembly is symmetrically provided on the inner arc surface of the valve seat. The sealing assembly includes a rubber seal, which is coaxially arranged with the valve seat. An installation arc groove is provided on the inner arc surface of the valve seat, adapting to the rubber seal and engaging with it. The inner edge of the rubber seal is rounded, and a reset groove is provided on the outer arc surface of the rubber seal. Multiple reset structures and rubber support blocks are provided between the installation arc groove and the reset groove.

[0008] As a further optimization of this utility model, the butterfly plate has arc-shaped protrusions at both its front and rear ends, and the transition between the arc-shaped protrusions and the edge of the butterfly plate is rounded.

[0009] As a further optimization of this utility model, the circumferential edge of the butterfly plate is machined with an inwardly chamfered dust scraping edge, and the outer side of the dust scraping edge is adapted to the inner arc surface of the rubber seal.

[0010] As a further optimization of this utility model, the multiple reset structures and rubber support blocks are arranged in a regular circular array, and the multiple reset structures and rubber support blocks are arranged in an alternating manner.

[0011] As a further optimization of this utility model, the reset structure includes a pair of reset seats, one of which is fixedly connected to the inner arc surface of the mounting arc groove, and the other of which is fixedly connected to the inner wall of the reset groove. A reset spring is sleeved on the outer side of the two reset seats, and the two ends of the reset spring are fixedly connected to the inner arc surface of the mounting arc groove and the inner wall of the reset groove, respectively.

[0012] As a further optimization of this utility model, the two reset seats are provided with symmetrical mounting grooves on one side of their opposite surfaces, which are coaxially arranged with the reset seats. Each of the two mounting grooves is embedded with a magnetic block, and the two magnetic blocks are set with the same magnetic pole.

[0013] As a further optimization of this utility model, one end of the rubber support block is fixedly connected to the inner arc surface of the mounting arc groove, and the other end of the rubber support block is fixedly connected to the inner wall of the reset groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, the sealing component provides uniform support for the seal and a balanced reset force, so that when the valve is closed, the seal can obtain stable support and reset force throughout the circumference. Therefore, under the influence of gravity, butterfly plate compression angle deviation, etc., the seal is less likely to form a small gap with the butterfly plate due to uneven local force, thus avoiding valve stem jamming caused by dust intrusion and accelerated seal wear. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is an exploded view of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the butterfly plate and valve seat of this utility model;

[0019] Figure 4This is an exploded view of the butterfly plate and valve seat of this utility model;

[0020] Figure 5 Structural breakdown of the valve seat of this utility model Figure 1 ;

[0021] Figure 6 Structural breakdown of the valve seat of this utility model Figure 2 ;

[0022] Figure 7 This is a schematic diagram of the resetting structure of this utility model;

[0023] Figure 8 This is an exploded view of the resetting structure of this utility model;

[0024] Figure 9 This is a cross-sectional view of the resetting structure of this utility model.

[0025] In the diagram: 1. Front valve body; 2. Rear valve body; 3. Valve seat; 4. Butterfly plate; 41. Arc-shaped protrusion; 42. Dust scraper ridge; 5. Valve stem; 6. Sealing assembly; 61. Rubber seal; 62. Mounting arc groove; 63. Reset groove; 64. Reset structure; 641. Reset seat; 642. Reset spring; 643. Mounting groove; 644. Magnetic block; 65. Rubber support block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Please see Figures 1-9 This utility model provides a technical solution:

[0029] A dustproof butterfly valve includes a front valve body 1 and a rear valve body 2. A valve seat 3 is provided between the front valve body 1 and the rear valve body 2. A butterfly plate 4 is provided on the inner side of the valve seat 3. A valve stem 5 is connected to the upper and lower ends of the butterfly plate 4. Rotary holes for accommodating the rotation of the valve stem 5 are opened at the upper and lower ends of the front valve body 1, the rear valve body 2 and the valve seat 3. A sealing assembly 6 is symmetrically provided on the inner arc surface of the valve seat 3. The sealing assembly 6 includes a rubber seal 61. The rubber seal 61 is coaxially arranged with the valve seat 3. An installation arc groove 62 is opened on the inner arc surface of the valve seat 3. The installation arc groove 62 is adapted to the rubber seal 61, and the rubber seal 61 is snapped into the installation arc groove 62. The inner edge of the rubber seal 61 is rounded. A reset groove 63 is opened on the outer arc surface of the rubber seal 61. Multiple reset structures 64 and rubber support blocks 65 are provided between the installation arc groove 62 and the reset groove 63.

[0030] It should be noted that: the front valve body 1 and the rear valve body 2 are connected by bolts to form the main frame of the valve. The inner wall is precision machined to ensure a tight seal with the valve seat 3 and to prevent external dust from entering from the joint. The valve seat 3 serves as the mounting carrier for the butterfly plate 4 and the sealing assembly 6. It is coaxially set with the front and rear valve bodies. The curvature of the inner arc surface is adapted to the outer diameter of the butterfly plate 4 to ensure that the butterfly plate 4 rotates without jamming.

[0031] Furthermore: the butterfly plate 4 is driven to rotate by the valve stem 5 and the handle on it. The cooperation between the valve stem 5 and the rotating hole ensures smooth rotation. A dustproof sealing ring (such as an O-ring) can be added to the rotating hole to further prevent dust from entering the rotation gap of the valve stem 5. The sealing component 6 is the core of dust prevention: the rubber seal 61 is fitted into the mounting arc groove 62 (the width of which is adapted to the thickness of the seal). The rounded edge can prevent the rubber seal 61 from being scratched when the butterfly plate 4 rotates, while increasing the contact area with the butterfly plate 4 and improving the sealing and dustproof effect. The reset groove 63 provides installation space for the reset structure 64 and the rubber support block 65. The two work together to ensure that the rubber seal 61 is quickly reset after being squeezed by the butterfly plate 4, maintaining the sealing shape and preventing dust from entering the channel due to the deformation of the rubber seal 61.

[0032] As a further implementation of this solution, both the front and rear ends of the butterfly plate 4 are provided with arc-shaped protrusions 41, and the transition between the arc-shaped protrusions 41 and the edge of the butterfly plate 4 is rounded.

[0033] It should be noted that the arc-shaped protrusion 41 is integrally formed with the butterfly plate 4. The core function of the arc-shaped protrusion 41 is to prevent dust from adhering to the surface of the butterfly plate 4. Traditional flat butterfly plates 4 are prone to dust accumulation, and dust is easily squeezed into the sealing gap. The convex structure formed by the protrusion can reduce the possibility of dust adhesion and can also use the airflow to carry away the dust through the guiding effect, which greatly reduces the amount of dust adhering to the butterfly plate 4. The rounded corner setting at the transition can eliminate the dead corner of dust retention and prevent dust from accumulating into hard blocks, further enhancing the anti-adhesion effect. At the same time, the arc-shaped protrusion 41 can also improve the bending strength of the butterfly plate 4 and prevent fluid pressure from causing deformation and expanding the dust accumulation area. The arc-shaped protrusion 41 is responsible for preventing dust from accumulating on the surface of the butterfly plate 4 and reducing dust interference with the seal. It works in concert with the reset structure 64 to improve the dustproof reliability of the valve.

[0034] As a further implementation of this solution, the circumferential edge of the butterfly plate 4 is machined with an inwardly chamfered dust scraping ridge 42, the outer side of which is adapted to the inner arc surface of the rubber seal 61.

[0035] It should be noted that the dust scraper 42 is set along the circumferential edge of the butterfly plate 4, and its outer side is closely fitted with the inner arc surface of the rubber seal 61, forming a double defense line of "dust scraping and sealing". When the butterfly plate 4 is rotated to open / close, the dust scraper 42 will slide along the inner arc surface of the rubber seal 61 like a "scraper" to scrape off the dust (such as dust and particulate impurities) attached to the surface of the rubber seal 61, and prevent dust from being squeezed into the sealing gap (traditional butterfly valves lack a dust scraping structure, and dust is easy to accumulate on the sealing surface, which will lead to premature sealing failure). At the same time, the appropriate fit ensures that the rubber seal 61 is not damaged when scraping dust. While actively removing dust, it protects the sealing structure, so that the valve can still work stably for a long time in dusty environments (such as building materials and mining industries).

[0036] As a further implementation of this solution, the multiple reset structures 64 and rubber support blocks 65 are arranged in a regular circular array, and the multiple reset structures 64 and rubber support blocks 65 are arranged alternately.

[0037] It should be noted that the reset structure 64 and the rubber support block 65 are arranged in a circumferential array, which can make the rubber seal 61 be subjected to uniform force throughout the circumference, and it is not easy to cause excessive or insufficient local force on the rubber seal 61. The array distribution can control the compression deviation of the rubber seal 61 within a small range, ensuring consistent sealing pressure throughout the circumference and no weak points in dust prevention.

[0038] Furthermore, the staggered arrangement of multiple reset structures 64 and rubber support blocks 65 achieves a synergistic effect of "elastic reset plus rigid support": the rubber support blocks 65 provide basic support force to prevent the rubber seal 61 from being excessively deformed due to long-term compression; the reset structures 64 provide elastic reset force to ensure that the rubber seal 61 quickly returns to its original shape after the butterfly plate 4 leaves. The alternating distribution of the two can form a uniform "support-reset" combined force around the rubber seal 61. Even in scenarios where the butterfly plate 4 is frequently opened and closed, the initial shape of the rubber seal 61 can still be maintained, preventing dust intrusion caused by local collapse or protrusion, and ensuring the long-term reliability of the dustproof seal.

[0039] As a further implementation of this solution, the reset structure 64 includes a pair of reset seats 641. One reset seat 641 is fixedly connected to the inner arc surface of the mounting arc groove 62, and the other reset seat 641 is fixedly connected to the inner wall of the reset groove 63. A reset spring 642 is sleeved on the outer side of the two reset seats 641. The two ends of the reset spring 642 are fixedly connected to the inner arc surface of the mounting arc groove 62 and the inner wall of the reset groove 63, respectively. A mounting groove 643 coaxially arranged with the reset seat 641 is symmetrically opened on one side of the opposite face of the two reset seats 641. A magnetic block 644 is embedded in both mounting grooves 643, and the two magnetic blocks 644 are set with the same magnetic pole.

[0040] It should be noted that: the reset seat 641 is fixed to the mounting arc groove 62 and the reset groove 63 respectively to ensure the stability of the installation reference of the reset structure 64 and avoid reset failure due to the offset of the reset seat 641; the reset spring 642, as the basic elastic element, compresses and stores energy when the rubber seal 61 is squeezed by the butterfly plate 4, and releases elastic potential energy after the butterfly plate 4 leaves, pushing the rubber seal 61 to reset quickly. Compared with the single rubber reset, the reset speed is greatly improved, which can reduce the window period for dust to enter when the rubber seal 61 is not reset;

[0041] Furthermore, the matching magnetic poles of the magnetic block 644 (made of neodymium iron boron) form a "magnetic repulsion-assisted reset": when the rubber seal 61 is compressed, the two reset seats 641 approach each other, and the matching magnetic block 644 generates a repulsive force, which is consistent with the elastic force of the reset spring 642, enhancing the reset power and preventing insufficient reset force due to fatigue of the reset spring 642; when the rubber seal 61 is reset to the initial position, the repulsive force of the magnetic block 644 can maintain the spacing of the reset seats 641, preventing permanent deformation caused by long-term stretching or compression of the reset spring 642, extending the service life of the reset structure 64. At the same time, the coaxial mounting groove 643 ensures that the force direction of the magnetic block 644 is consistent with the reset direction, with no radial component force, preventing the reset seat 641 from tilting, further ensuring the stable operation of the reset structure 64, and ultimately ensuring that the rubber seal 61 always maintains a sealed state, blocking the dust intrusion channel;

[0042] As a further implementation of this solution, one end of the rubber support block 65 is fixedly connected to the inner arc surface of the mounting arc groove 62, and the other end of the rubber support block 65 is fixedly connected to the inner wall of the reset groove 63.

[0043] It should be noted that the two ends of the rubber support block 65 are fixed by vulcanization bonding or high-strength glue to ensure a firm connection with the mounting arc groove 62 and the reset groove 63, eliminating the risk of detachment. Its core function is to provide appropriate support force when the rubber seal 61 is not squeezed by the butterfly plate 4, so that the rubber seal 61 maintains its arc shape coaxial with the valve seat 3, preventing the seal from sagging or deforming due to gravity or slight vibration. When the butterfly plate 4 squeezes the rubber seal 61, the rubber support block 65 can undergo elastic deformation with the compression of the rubber seal 61, absorbing part of the compression stress, relieving the stress on the reset spring 642, and extending the life of the reset spring 642. While supporting the shape of the rubber seal 61, it also protects the integrity of the sealing structure and ensures long-term dustproof effect.

[0044] Work process: When the valve needs to be opened, turn the handle on the valve stem 5 to drive the butterfly plate 4 to rotate from 0° (closed) to 90° (open). During the rotation of the butterfly plate 4, the dust scraping edge 42 of its edge slides along the inner arc surface of the rubber seal 61, scraping away the dust (such as cement dust and mineral powder) attached to the surface of the rubber seal 61 like a "scraper", preventing dust from being squeezed into the sealing gap. The arc-shaped protrusion 41 on the surface of the butterfly plate 4 forms a convex structure, reducing the dust settling area. At the same time, the airflow is guided along the arc surface, carrying away the dust that is about to be attached, so that the amount of dust on the surface of the butterfly plate 4 is greatly reduced. The rounded corner design at the transition eliminates the dead corner of dust retention, avoids the accumulation of hard blocks, and further reduces the interference of dust on the seal. As the butterfly plate 4 leaves the rubber seal 61, the reset spring 642 of the reset structure 64 releases elastic potential energy, and with the repulsive force of the magnetic block 644, pushes the rubber seal 61 to quickly reset, and the rubber support block 65 rebounds synchronously.

[0045] When the valve needs to be closed, the handle is turned in the opposite direction, and the butterfly plate 4 rotates from 90° to 0°. During the closing process of the butterfly plate 4, the dust scraper 42 slides along the inner arc surface of the rubber seal 61 again, removing the dust that was newly attached to the surface of the rubber seal 61 during the valve opening, preparing for subsequent sealing and preventing dust from getting stuck between the sealing surfaces and affecting the sealing performance. When the butterfly plate 4 rotates to 0°, its edge contacts the rubber seal 61. As the handle continues to apply force, the butterfly plate 4 squeezes the rubber seal 61, the return spring 642 is compressed and stored energy, the distance between the magnetic blocks 644 decreases and the repulsive force increases. At this time, the rubber seal 61 is compressed evenly around the circumference under the synergistic action of the return structure 64 and the rubber support block 65. Combined with the close sealing of the dust scraper 42, a double dustproof barrier is formed. Although the arc-shaped protrusion 41 of the butterfly plate 4 does not directly increase the sealing pressure, it can prevent the butterfly plate 4 from deforming due to fluid pressure, preventing deformation from causing the gap between the sealing surfaces to widen. At the same time, the convex structure reduces the accumulation of dust in the area of ​​the butterfly plate 4, further reducing the risk of dust breaking through the seal.

[0046] During stable operation after the valve is closed, each component continues to play a dustproof role: the rubber support block 65 provides basic support force, maintains the shape of the rubber seal 61, and avoids deformation of the seal due to gravity or slight vibration; the magnetic block 644 of the reset structure 64 maintains the spacing of the reset seat 641 and avoids permanent deformation of the reset spring 642 due to long-term compression; the arc-shaped protrusion 41 continuously reduces dust accumulation on the surface of the butterfly plate 4, and even if a small amount of dust settles, it can be removed by the dust scraper 42 during the next opening and closing.

[0047] 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 dustproof butterfly valve, comprising a front valve body (1) and a rear valve body (2), characterized in that: A valve seat (3) is provided between the front valve body (1) and the rear valve body (2). A butterfly plate (4) is provided on the inner side of the valve seat (3). A valve stem (5) is connected to the upper and lower ends of the butterfly plate (4). A rotating hole for accommodating the rotation of the valve stem (5) is provided at the upper and lower ends of the front valve body (1), the rear valve body (2) and the valve seat (3). A sealing component (6) is symmetrically provided on the inner arc surface of the valve seat (3). The sealing assembly (6) includes a rubber seal (61), which is coaxially arranged with the valve seat (3). The inner arc surface of the valve seat (3) is provided with an installation arc groove (62), which is adapted to the rubber seal (61) and the rubber seal (61) is snapped into the installation arc groove (62). The inner edge of the rubber seal (61) is rounded. The outer arc surface of the rubber seal (61) is provided with a reset groove (63). Multiple reset structures (64) and rubber support blocks (65) are provided between the installation arc groove (62) and the reset groove (63).

2. The dustproof butterfly valve according to claim 1, characterized in that: Both ends of the butterfly plate (4) are provided with arc-shaped protrusions (41), and the transition between the arc-shaped protrusions (41) and the edge of the butterfly plate (4) is rounded.

3. A dustproof butterfly valve according to claim 1, characterized in that: The circumferential edge of the butterfly plate (4) is machined with an inwardly chamfered dust scraper ridge (42), the outer side of which is adapted to the inner arc surface of the rubber seal (61).

4. A dustproof butterfly valve according to claim 1, characterized in that: The multiple reset structures (64) and rubber support blocks (65) are arranged in a regular circular array, and the multiple reset structures (64) and rubber support blocks (65) are arranged alternately.

5. A dustproof butterfly valve according to claim 1, characterized in that: The reset structure (64) includes a pair of reset seats (641). One reset seat (641) is fixedly connected to the inner arc surface of the mounting arc groove (62), and the other reset seat (641) is fixedly connected to the inner wall of the reset groove (63). A reset spring (642) is sleeved on the outer side of the two reset seats (641). The two ends of the reset spring (642) are fixedly connected to the inner arc surface of the mounting arc groove (62) and the inner wall of the reset groove (63), respectively.

6. A dustproof butterfly valve according to claim 5, characterized in that: The two reset seats (641) have symmetrical mounting slots (643) on one side of their opposite surfaces, which are coaxially arranged with the reset seats (641). Each of the two mounting slots (643) is embedded with a magnetic block (644), and the two magnetic blocks (644) are set with the same magnetic pole.

7. A dustproof butterfly valve according to claim 1, characterized in that: One end of the rubber support block (65) is fixedly connected to the inner arc surface of the mounting arc groove (62), and the other end of the rubber support block (65) is fixedly connected to the inner wall of the reset groove (63).

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