Valve seat structure for a butterfly valve

Abstract

The utility model discloses a valve seat structure of butterfly valve relates to butterfly valve technical field. The valve seat structure of butterfly valve, including valve seat, the end portion of valve seat is equipped with the clamp, and the end portion of valve seat is butt jointed with the pipeline, and the other section of clamp is equipped on the pipeline, and the fastening nut is fixedly installed on the clamp, and the quick release bolt is threadedly connected on the fastening nut, and the power bin is fixedly installed above the valve seat, and the electric bidirectional butterfly valve device is arranged in the valve seat and includes: the pivot, the worm wheel, the worm, the servo motor, is connected through the symmetrical structure of valve seat and quick release clamp, realizes bidirectional sealing function and convenient maintenance characteristics, and the symmetrical valve seat ensures that the butterfly plate can form reliable sealing through the inclined wedge principle when the medium positive and negative flow direction, and the worm wheel and the worm enhance the sealing specific pressure and improve the control precision, ensure the close fit of sealing surface, and the inclined wedge butterfly plate reduces the friction loss, and the self -locking characteristic of worm wheel and worm prevents the medium pressure fluctuation, and improves the system safety.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and in particular to a valve seat structure for a butterfly valve. Background Technology

[0002] Currently, the butterfly valve seat structure on the market has many shortcomings in terms of sealing performance, installation and maintenance, and adaptability to working conditions.

[0003] Traditional valve seats are mostly designed for one-way sealing, requiring strict differentiation of the medium flow direction during installation. This leads to complex pipeline system layouts and is prone to sealing failure due to incorrect flow direction judgment. They cannot meet the reliable shut-off requirements for bidirectional flow conditions, posing safety hazards in scenarios requiring bidirectional control, such as petrochemicals and water supply and drainage. Their connection methods typically involve flange welding or bolt fastening, requiring precise alignment of bolt holes and application of significant pre-tightening force during installation. Maintenance requires complete disassembly of the pipeline, which is cumbersome and time-consuming, severely impacting the maintenance efficiency of the pipeline system. Especially in emergency maintenance, excessive disassembly time may lead to the escalation of accidents.

[0004] In terms of transmission control, traditional butterfly valves often use simple gears or worm gears for direct drive, which makes it difficult to balance opening and closing accuracy with sealing pressure. This can easily lead to problems such as the valve plate not rotating into the correct position or the sealing surface not fitting tightly. Under the impact of high-pressure media, leakage is likely to occur. The sealing surfaces of the valve plate and valve seat are mostly designed as planes or at a single angle, resulting in severe frictional wear during long-term opening and closing, which leads to a decline in sealing performance and requires frequent replacement of sealing components, increasing maintenance costs. At the same time, the existing valve seat structure lacks an adaptive compensation mechanism for media pressure. When the system pressure fluctuates, the sealing pressure cannot be adjusted synchronously, which may lead to leakage due to insufficient pressure or valve plate jamming due to excessive pressure, affecting the valve's service life and operational reliability. Utility Model Content

[0005] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a valve seat structure for a butterfly valve that can solve the problem of bidirectional flow in a butterfly valve.

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

[0007] A valve seat structure for a butterfly valve includes a valve seat, an end of which is fitted with a clamp, and the end of the valve seat is connected to a pipe. The other end of the clamp is fitted onto the pipe. A fastening nut is fixedly installed on the clamp, and a quick-release bolt is threaded onto the fastening nut. A power chamber is fixedly installed above the valve seat, and an electric bidirectional butterfly valve device is installed inside the valve seat.

[0008] The electric bidirectional butterfly valve device includes: a rotating shaft, a worm gear, a worm, a servo motor, a driving gear, a driven gear, a valve stem, a butterfly plate, and a valve chamber.

[0009] Preferably, the rotating shaft is rotatably installed inside the power compartment, and the worm gear and the drive gear are respectively fixedly installed at both ends of the rotating shaft.

[0010] Preferably, the servo motor is fixedly mounted above the valve seat, and the worm gear is fixedly mounted on the output shaft of the servo motor, with the worm gear meshing with the worm wheel.

[0011] Preferably, the valve stem is rotatably connected inside the valve seat, and the driven gear is fixedly installed above the valve stem, with the driven gear meshing with the driving gear.

[0012] Preferably, the valve cavity is fixedly installed inside the valve seat, and the butterfly plate is located inside the valve cavity and fixedly installed on the valve stem.

[0013] Preferably, the valve seat has symmetrical shapes on both sides, and the butterfly plate has a beveled wedge shape.

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

[0015] (1) The valve seat structure of this butterfly valve and the power transmission system adopt a combination of worm gear speed increase and gear set speed reduction, which converts the high speed and low torque output of the servo motor into the low speed and high torque rotation of the valve stem, which not only improves the control accuracy but also enhances the sealing pressure, ensuring the tight fit between the butterfly plate and the sealing surface of the valve cavity. The inclined wedge-shaped butterfly plate gradually separates from or contacts the sealing surface during the opening and closing process, reducing friction loss and extending the life of the sealing components. The self-locking characteristics of the worm and worm wheel prevent the butterfly plate from rotating unexpectedly due to the fluctuation of the medium pressure, thus improving the system safety. The precise cooperation between the various parts realizes the high reliability and convenient operation of bidirectional fluid control, and is suitable for various systems such as petrochemical and water treatment that require frequent opening and closing and maintenance.

[0016] (2) The valve seat structure of the butterfly valve achieves bidirectional sealing function and convenient maintenance characteristics through the symmetrical structure design of the valve seat and quick-release clamp connection. The symmetrical valve seat ensures that the butterfly plate can form a reliable seal through the inclined wedge principle when the medium flows in both directions, without distinguishing the installation direction, simplifying the system layout. The positioning convex ring on the inner wall of the clamp cooperates with the groove at the end of the valve seat, and quick installation and removal are achieved through quick-release bolts and fastening nuts, avoiding the complex process of traditional welding or flange connection, and significantly shortening the maintenance time. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the valve seat structure of a butterfly valve according to the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of the valve seat structure of a butterfly valve according to the present invention;

[0020] Figure 3 This is a schematic cross-sectional view of the valve seat structure of a butterfly valve according to the present invention;

[0021] Figure 4 This is a cross-sectional schematic diagram of the valve seat structure of a butterfly valve according to the present invention.

[0022] Reference numerals: 1. Valve seat; 2. Clamp; 3. Pipeline; 4. Quick-release bolt; 5. Fastening nut; 6. Power compartment; 7. Shaft; 8. Worm gear; 9. Worm; 10. Servo motor; 11. Drive gear; 12. Driven gear; 13. Valve stem; 14. Butterfly plate; 15. Valve chamber. Detailed Implementation

[0023] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. 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.

[0025] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Please see Figure 1-4 This utility model provides a technical solution: a valve seat structure for a butterfly valve, including a valve seat 1, the two sides of the valve seat 1 are symmetrical, a clamp 2 is fitted at the end of the valve seat 1, a pipe 3 is connected to the end of the valve seat 1, the other end of the clamp 2 is fitted on the pipe 3, a fastening nut 5 is fixedly installed on the clamp 2, a quick-release bolt 4 is threaded on the fastening nut 5, a power chamber 6 is fixedly installed above the valve seat 1, and an electric bidirectional butterfly valve device is installed inside the valve seat 1.

[0028] Insert both ends of valve seat 1 into the port of pipe 3, and put on clamp 2. The inner wall of clamp 2 has a positioning protrusion ring that matches the groove at the end of valve seat 1. Lock clamp 2 with quick release bolt 4 and fastening nut 5 to make valve seat 1 and pipe 3 form a rigid connection. When maintenance is required, loosen quick release bolt 4, remove clamp 2, and valve seat 1 can be completely removed from pipe 3 for inspection.

[0029] The electric bidirectional butterfly valve device includes: a rotating shaft 7, a worm gear 8, a worm 9, a servo motor 10, a driving gear 11, a driven gear 12, a valve stem 13, a butterfly plate 14, and a valve chamber 15;

[0030] The rotating shaft 7 is rotatably installed inside the power compartment 6, and the worm gear 8 and the drive gear 11 are respectively fixedly installed at both ends of the rotating shaft 7;

[0031] The servo motor 10 is fixedly mounted above the valve seat 1, and the worm 9 is fixedly mounted on the output shaft of the servo motor 10. The worm 9 meshes with the worm wheel 8.

[0032] The valve stem 13 is rotatably connected inside the valve seat 1, and the driven gear 12 is fixedly installed above the valve stem 13. The driven gear 12 meshes with the driving gear 11.

[0033] The valve cavity 15 is fixedly installed inside the valve seat 1, and the butterfly plate 14 is located inside the valve cavity 15 and fixedly installed on the valve stem 13. The butterfly plate 14 is in the shape of a beveled wedge.

[0034] During the opening process, the servo motor 10 rotates clockwise after being powered on, and the output shaft drives the worm 9 to rotate at high speed. The worm wheel 8 meshes with the worm 9, and the worm wheel 8 converts the high speed and low torque of the worm 9 into a low speed and high torque output, which drives the rotating shaft 7 to rotate clockwise. The driving gear 11 at the lower end of the rotating shaft 7 meshes with the driven gear 12 at the top of the valve stem 13 to form a reduction transmission. The driven gear 12 drives the valve stem 13 to rotate. The butterfly plate 14 fixed at the lower end of the valve stem 13 rotates synchronously with the valve stem 13. Its inclined wedge-shaped edge gradually separates from the symmetrical sealing surfaces on both sides of the valve cavity 15. When the butterfly plate 14 rotates to be parallel to the axis of the valve cavity 15, the fluid channel is fully opened, and the medium can flow freely in both directions.

[0035] During the closing process, the servo motor 10 drives the valve stem 13 to rotate counterclockwise. The worm 9, worm wheel 8, rotating shaft 7, and driving gear 11 move synchronously in the opposite direction. The driven gear 12 drives the valve stem 13 to rotate counterclockwise. When the butterfly plate 14 rotates with the valve stem 13 to be perpendicular to the axis of the valve cavity 15, its inclined wedge-shaped edge is completely in contact with the sealing surfaces of the valve seats 1 on both sides. Since the structure of the valve seat 1 is symmetrical on both sides, the butterfly plate 14 can generate sealing pressure in both directions under the action of medium pressure through the inclined wedge tightening principle, so as to achieve bidirectional zero leakage sealing.

[0036] Working principle: During use, the valve seat 1 is inserted into the pipe 3 at both ends during installation, and locked with clamps 2, quick-release bolts 4 and fastening nuts 5 to form a rigid connection. When opening, the servo motor 10 drives the worm 9 to rotate, which is accelerated by the worm wheel 8 and transmitted by the rotating shaft 7. The driving gear 11 and driven gear 12 reduce the speed and drive the valve stem 13, so that the butterfly plate 14 rotates to be parallel to the axis of the valve cavity 15 to open the channel. When closing, the servo motor 10 drives in the opposite direction, and the butterfly plate 14 rotates to be perpendicular to the axis. Its inclined wedge-shaped edge fits against the symmetrical sealing surface of the valve seat 1, and the medium pressure wedges to achieve bidirectional sealing. During maintenance, the valve seat 1 can be removed by loosening the quick-release bolts 4.

[0037] The symmetrical structure design of valve seat 1 and quick-release clamp 2 achieve bidirectional sealing function and convenient maintenance. The symmetrical valve seat 1 ensures that the butterfly plate 14 can form a reliable seal through the inclined wedge principle when the medium flows in both directions, without distinguishing the installation direction, which simplifies the system layout. The positioning convex ring on the inner wall of clamp 2 cooperates with the end groove of valve seat 1, and quick installation and removal are achieved by quick-release bolt 4 and fastening nut 5, avoiding the complicated process of traditional welding or flange connection, and significantly shortening maintenance time.

[0038] The power transmission system employs a combination of worm gear 8 and worm 9 for speed increase and gear set for speed reduction, converting the high-speed, low-torque output of servo motor 10 into low-speed, high-torque rotation of valve stem 13. This improves control accuracy and enhances sealing pressure, ensuring a tight fit between the butterfly plate 14 and the sealing surface of valve cavity 15. The inclined wedge-shaped butterfly plate 14 gradually detaches from or contacts the sealing surface during opening and closing, reducing friction loss and extending the life of the seals. The self-locking characteristics of worm 9 and worm gear 8 prevent accidental rotation of butterfly plate 14 caused by medium pressure fluctuations, improving system safety. The precise coordination between the components achieves high reliability and ease of operation for bidirectional fluid control, making it suitable for various systems requiring frequent opening, closing, and maintenance, such as petrochemical and water treatment industries.

[0039] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A valve seat structure of a butterfly valve comprising a valve seat (1), characterized in that: The valve seat (1) is fitted with a clamp (2) at one end, and the valve seat (1) is connected to a pipe (3). The other end of the clamp (2) is fitted onto the pipe (3), and a fastening nut (5) is fixedly installed on the clamp (2). The fastening nut (5) is threaded with a quick-release bolt (4), and a power chamber (6) is fixedly installed above the valve seat (1). An electric two-way butterfly valve device is installed inside the valve seat (1). The electric bidirectional butterfly valve device includes: a rotating shaft (7), a worm gear (8), a worm (9), a servo motor (10), a driving gear (11), a driven gear (12), a valve stem (13), a butterfly plate (14), and a valve chamber (15).

2. The valve seat structure of a butterfly valve according to claim 1, characterized by: The rotating shaft (7) is rotatably installed inside the power compartment (6), and the worm gear (8) and the drive gear (11) are respectively fixedly installed at both ends of the rotating shaft (7).

3. A valve seat structure for a butterfly valve according to claim 2, wherein: The servo motor (10) is fixedly installed above the valve seat (1), and the worm (9) is fixedly installed on the output shaft of the servo motor (10). The worm (9) meshes with the worm wheel (8).

4. The valve seat structure of a butterfly valve according to claim 3, characterized in that: The valve stem (13) is rotatably connected inside the valve seat (1), and the driven gear (12) is fixedly installed above the valve stem (13). The driven gear (12) meshes with the driving gear (11).

5. The valve seat structure of a butterfly valve according to claim 4, characterized in that: The valve cavity (15) is fixedly installed inside the valve seat (1), and the butterfly plate (14) is located inside the valve cavity (15) and fixedly installed on the valve stem (13).

6. The valve seat structure of a butterfly valve according to claim 5, characterized in that: The valve seat (1) has symmetrical shapes on both sides, and the butterfly plate (14) has a wedge-shaped shape.

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