Butterfly valve with multiple sealing structure

Abstract

The utility model provides a butterfly valve with multiple sealing structure, including valve body, valve core board, valve core seat and the valve rod through being arranged in the inside of valve body, wherein valve core board sealing surface and valve core seat outer surface are in close conjunction, realize the sealing in the valve body, and the fixed seat is established on the rod wall of valve rod, here fixed seat and valve rod fixed connection between, because the utility model discloses through the fixed bolt and the adjusting mouth fixed on the valve rod, makes it synchronous rotation with valve rod, and the fixed seat bottom is closely contacted with the damping top board through the antiskid pad, and the limiting spring is equipped below the damping top board, and the lower end of the spring is supported by the mounting seat fixed on the valve body, thereby lasting axial top pressure is exerted to the damping top board, this design will the circumferential rotation movement that valve rod can occur, the great static friction between the damping top board and fixed seat is converted into the axial damping that needs to overcome, greatly increases the resistance of spontaneous rotation of valve rod, ensures the position locking reliability of valve under the opening or closed state.

Description

Technical Field

[0001] This utility model relates to the technical field of butterfly valves, specifically to a butterfly valve with a multi-seal structure. Background Technology

[0002] A butterfly valve, also known as a flap valve, is generally used for the on / off control of pipeline media. It is a simple regulating valve. The butterfly valve's opening and closing element, also called the valve core butterfly plate, can be used for the on / off control of low-pressure pipeline media. It rotates with the valve stem to achieve opening and closing. When the valve core butterfly plate is aligned with the valve body, the fluid can pass through smoothly; when the valve core butterfly plate is rotated 90 degrees to be perpendicular to the fluid direction, the valve is closed and the fluid cannot pass through.

[0003] According to Chinese patent number "CN 222122265 U", a butterfly valve with a multi-seal structure is disclosed. The valve body is a cylindrical tubular structure with sealing components installed on it. Through the arrangement of grooves, protrusions, and pads, when two valve bodies are connected or the valve body is connected to a pipeline, the insertion of the protrusions into the grooves improves the sealing performance, and the elastic contact between the protrusions and the pads further enhances the sealing performance, resulting in a good sealing effect. A stop seat and a sealing block are also provided. The stop seat limits the movement of the sealing block, preventing displacement and ensuring the sealing effect between the sealing plate and the sealing block. This solves the problem of leakage that easily occurs in existing butterfly valves during use.

[0004] In the aforementioned technology, the butterfly valve utilizes the inherent characteristics of the helical spring, with its upper end pressed against the bottom of the stop block, achieving elastic clamping of the stop block and reducing the probability of the rotating shaft loosening. Combined with the auxiliary rod's clamping against the rubber sleeve, this also reduces the probability of the rotating shaft loosening. However, since the lower end of the helical spring is in elastic contact with the valve body, if the pressure inside the valve body is too high, the sealing plate may still cause the rotating shaft and the stop block control spring to rotate relative to the valve body surface, potentially leading to loosening. Simultaneously, the auxiliary rod's smooth surface, when pressed against the rubber sleeve, generates relatively little resistance, making it difficult to prevent the sealing plate from rotating. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the problem that when the internal pressure of the existing butterfly valve is too high, the sealing plate may still drive the rotating shaft and the stop control spring to rotate relative to the valve body surface, and there may still be a chance of loosening. At the same time, the auxiliary rod surface is smooth and it is pressed against the rubber sleeve, so the resistance generated is small and it is still difficult to prevent the sealing plate from rotating.

[0006] The technical solution adopted to solve the above technical problems is:

[0007] A butterfly valve with a multi-seal structure includes a valve body, a valve core plate, a valve core seat, and a valve stem that penetrates the valve body. A fixing seat is provided on the stem wall of the valve stem, and a matching damping top plate is provided at the bottom of the fixing seat. A limiting spring is provided at the bottom of the damping top plate, and a mounting seat is provided at the lower end of the limiting spring. The mounting seat is detachably mounted on the valve body, and a limiting sleeve is slidably connected inside the mounting seat. The upper end of the limiting sleeve is fixedly mounted on the bottom of the fixing seat. The mounting seat, the limiting spring, and the limiting sleeve are all sleeved on the outside of the valve stem.

[0008] As a preferred embodiment of this utility model, the top of the damping top plate abuts against the bottom of the fixing seat, and the bottom of the fixing seat is provided with an anti-slip pad.

[0009] As a preferred technical solution of this utility model, the valve stem is provided with an adjustment port from bottom to top on the outer wall of the valve body. The fixed seat is connected to the inside of the adjustment port through a fixed pin, so that the valve stem rotation controls the fixed seat to rotate together.

[0010] As a preferred embodiment of this utility model, the top of the fixing seat is provided with a locking bolt, which is threaded onto the outer wall of the valve stem.

[0011] As a preferred embodiment of this utility model, the upper end of the valve stem passes through the valve body and is connected to a turntable, and the outer side wall of the turntable is provided with a protective pad.

[0012] As a preferred embodiment of this utility model, the valve body is connected to both the output end and the input end with a connecting flange. Trapezoidal grooves are provided on both sides of the connecting flanges, and trapezoidal sealing rings are provided on the inner sides of the two trapezoidal grooves.

[0013] As a preferred technical solution of this utility model, the inner diameters of the two trapezoidal grooves decrease sequentially from the outside to the inside, forming a double seal.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention effectively solves the problem of valve stems easily becoming loose due to self-rotation under pipeline medium pressure by setting an axial damping system consisting of a damping top plate, a limiting spring, and a limiting sleeve. Specifically, the fixed seat is fixed to the adjustment port on the valve stem by a fixing pin, allowing it to rotate synchronously with the valve stem. The bottom of the fixed seat is in close contact with the damping top plate through an anti-slip pad. A limiting spring is provided below the damping top plate, and the lower end of the spring is supported by a mounting seat fixed to the valve body, thereby applying a continuous axial clamping force to the damping top plate. This design converts the possible circumferential rotational movement of the valve stem into axial damping that needs to be overcome through the huge static friction between the damping top plate and the fixed seat, greatly increasing the resistance to the spontaneous rotation of the valve stem, ensuring the reliability of the valve's position locking in the open or closed state, and fundamentally preventing sealing failure caused by internal pressure fluctuations.

[0016] This utility model significantly improves the valve's adjustment adaptability and end-face sealing reliability by integrating an adjustable spring preload mechanism and a double flange sealing structure. The preload of the limit spring can be adjusted in two ways: first, by inserting a fixing pin into the adjustment port at different heights on the valve stem to change the initial position of the fixing seat and adjust the spring compression; second, by turning the locking bolt on the top of the fixing seat to directly drive the fixing seat down to compress the spring. This dual adjustment mechanism allows the damping force to be precisely adjusted according to actual working conditions to maintain the best anti-loosening effect.

[0017] Furthermore, trapezoidal grooves with gradually decreasing inner diameters are cut on the end faces of the flanges at both ends of the valve body, and trapezoidal sealing rings are embedded therein, forming a double sealing ring from the outside in. This greatly enhances the sealing reliability at the valve-pipeline connection and eliminates the risk of media leakage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the main cross-sectional structure of the present utility model;

[0020] Figure 3 for Figure 2 A partially enlarged structural diagram.

[0021] In the diagram: 1. Valve body; 2. Valve core plate; 3. Valve core seat; 4. Valve stem; 5. Mounting seat; 6. Limit spring; 7. Damping top plate; 8. Fixed seat; 9. Limit sleeve; 10. Adjustment port; 11. Fixed pin; 12. Locking bolt; 13. Connecting flange; 14. Trapezoidal groove; 15. Trapezoidal sealing ring; 16. Turntable. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0027] Example 1

[0028] exist Figures 1-3This utility model provides a technical solution: a butterfly valve with a multi-seal structure, including a valve body 1, a valve core plate 2, a valve core seat 3, and a valve stem 4 that penetrates the inside of the valve body 1. The sealing surface of the valve core plate 2 is in contact with the outer surface of the valve core seat 3, achieving a seal within the valve body 1. A fixing seat 8 is provided on the stem wall of the valve stem 4, and the fixing seat 8 is fixedly connected to the valve stem 4. Furthermore, a matching damping top plate 7 is provided at the bottom of the fixing seat 8 to enhance the friction between the fixing seat 8 and the valve stem 4. This prevents the valve stem 4 from rotating on its own after the valve core plate 2 is opened and closed by rotating the valve stem 4, due to the damping effect. The damping top plate 7 further enhances the damping effect. The bottom of the valve stem 4 is provided with a limiting spring 6, and the lower end of the limiting spring 6 is provided with a mounting seat 5. The mounting seat 5 is detachably mounted on the valve body 1. The reverse force of the limiting spring 6 controls the damping top plate 7 to press against the fixed seat 8. At the same time, a limiting sleeve 9 is slidably connected inside the mounting seat 5. The upper end of the limiting sleeve 9 is fixedly mounted on the bottom of the fixed seat 8. Under the limitation of the mounting seat 5, the limiting spring 6 controls the vertical up and down movement of the limiting sleeve 9 and the fixed seat 8 to improve the clamping effect. The mounting seat 5, the limiting spring 6, and the limiting sleeve 9 are all sleeved on the outside of the valve stem 4. At the same time, the mounting seat 5 can be detachably mounted on the valve body 1 by bolts, which facilitates the subsequent maintenance of the spring.

[0029] The top of the damping top plate 7 is pressed against the bottom of the fixed seat 8. The bottom of the fixed seat 8 is provided with an anti-slip pad. The addition of the anti-slip pad further enhances the friction between the contact surface of the damping top plate 7 and the fixed seat 8, and further prevents the valve stem 4 from becoming loose.

[0030] In one aspect of this embodiment, to further improve the adjustment of the self-acting force of the limiting spring 6, an adjustment port 10 is provided from bottom to top on the outer side wall of the valve stem 4 near the valve body 1. The fixed seat 8 is connected to the inside of the adjustment port 10 through a fixed pin 11, so that the valve stem 4 rotates to control the fixed seat 8 to rotate together. At the same time, the pin is inserted into the adjustment port 10 below to control the limiting spring 6 to contract and improve the elasticity effect.

[0031] In one aspect of this embodiment, based on the previous implementation, a locking bolt 12 is provided on the top of the fixed seat 8. The locking bolt 12 is threaded onto the outer wall of the valve stem 4. When adjusting the spring force, the locking bolt 12 is rotated to press against the lower fixed seat 8 and move downward, thereby pushing the damping top plate 7 to move downward along the mounting seat 5, compressing the spring to contract, and realizing the spring force adjustment, so that the adjustment can be carried out when the spring force decreases.

[0032] In one aspect of this embodiment, the upper end of the valve stem 4 passes through the valve body 1 and is connected to a turntable 16, and the outer side wall of the turntable 16 is provided with a protective pad.

[0033] In one aspect of this embodiment, both the output end and the input end of the valve body 1 are connected to a connecting flange 13. Trapezoidal grooves 14 are provided on both end faces of the connecting flange 13. Trapezoidal sealing rings 15 are provided on the inner sides of the two trapezoidal grooves 14. The inner diameters of the two trapezoidal grooves 14 decrease from the outside to the inside, forming a double seal.

[0034] The butterfly valve with a multi-seal structure described in this utility model operates as follows: When the valve needs to be opened or closed, the operator rotates the turntable 16 at the upper end of the valve stem 4, and the valve stem 4 rotates accordingly. It drives the fixed seat 8 to rotate synchronously through the fixed pin 11, thereby driving the valve core plate 2 to rotate 90 degrees inside the valve body 1 to realize the opening and closing of the flow channel. During the rotation of the valve stem 4, a huge static friction force is generated between the anti-slip pad at the bottom of the fixed seat 8 and the damping top plate 7 below. The damping top plate 7 is subjected to the continuous axial pressing force of the limiting spring 6 below it. The lower end of the limiting spring 6 is supported by the mounting seat 5 fixedly installed on the valve body 1. The limiting sleeve 9 ensures that the fixed seat 8 and the damping top plate 7 can only move axially. This friction torque constitutes the main resistance that must be overcome when the valve stem 4 rotates. When the valve reaches the fully open or fully closed position, the operator removes the rotation torque. The damping system can effectively resist the torque generated by the pressure fluctuation of the medium in the pipeline on the valve core plate 2, prevent the valve stem 4 from self-rotating and loosening, and ensure the stability of the valve state.

[0035] Secondly, the preload of the limit spring 6 can be adjusted in two ways: one is to insert the fixing pin 11 into the adjustment port 10 at different heights on the valve stem 4 to change the initial compression amount; the other is to tighten the locking bolt 12 on the top of the fixing seat 8 and directly push the fixing seat 8 down to further compress the spring. The connection between the valve and the pipeline is achieved through the connecting flanges 13 at both ends of the valve body 1. The trapezoidal sealing ring 15 embedded in the trapezoidal groove 14 on its end face forms a double sealing ring by utilizing the structure of the groove gradually shrinking from the outside to the inside, ensuring zero leakage at the interface.

[0036] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model 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 this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A butterfly valve with a multi-seal structure, comprising a valve body (1), a valve core plate (2), a valve core seat (3), and a valve stem (4) extending through the interior of the valve body (1), characterized in that: The valve stem (4) has a fixed seat (8) on its stem wall. The bottom of the fixed seat (8) has a matching damping top plate (7). The bottom of the damping top plate (7) has a limiting spring (6). The lower end of the limiting spring (6) has a mounting seat (5). The mounting seat (5) is detachably mounted on the valve body (1). The mounting seat (5) has a sliding connection to a limiting sleeve (9). The upper end of the limiting sleeve (9) is fixedly mounted on the bottom of the fixed seat (8). The mounting seat (5), the limiting spring (6), and the limiting sleeve (9) are all sleeved on the outside of the valve stem (4).

2. The butterfly valve with a multiple sealing structure according to claim 1, characterized in that: The top of the damping top plate (7) abuts against the bottom of the fixing seat (8), and the bottom of the fixing seat (8) is provided with an anti-slip pad.

3. A butterfly valve with a multiple sealing structure according to claim 1, characterized in that: The valve stem (4) is located on the outer side wall of the valve body (1) and has an adjustment port (10) from bottom to top. The fixed seat (8) is connected to the inside of the adjustment port (10) through a fixed pin (11) so that the valve stem (4) can rotate and the fixed seat (8) can rotate together.

4. A butterfly valve with a multiple sealing structure according to claim 3, characterized in that: The top of the fixed seat (8) is provided with a locking bolt (12), which is threaded onto the outer wall of the valve stem (4).

5. A butterfly valve with a multiple sealing structure according to claim 1, characterized in that: The upper end of the valve stem (4) passes through the valve body (1) and is connected to a turntable (16), and the outer side wall of the turntable (16) is provided with a protective pad.

6. A butterfly valve with a multiple sealing structure according to claim 1, characterized in that: The valve body (1) is connected to both the output and input ends by connecting flanges (13). Trapezoidal grooves (14) are provided on both ends of the connecting flanges (13), and trapezoidal sealing rings (15) are provided on the inner sides of the two trapezoidal grooves (14).

7. A butterfly valve with a multiple sealing structure according to claim 6, characterized in that: The inner diameters of the two trapezoidal grooves (14) decrease sequentially from the outside to the inside, forming a double seal.

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