Limiting mechanism of soft sealing butterfly valve

Abstract

The utility model discloses a soft seal butterfly valve limit mechanism which comprises a valve body, a valve shaft and a butterfly plate, the limit mechanism is arranged at the bottom of the valve body, one end of the valve shaft is connected with a power mechanism, the other end of the valve shaft penetrates through the valve body and extends into the limit mechanism, the limit mechanism comprises a bottom cover and a limit bolt, and a positioning nut is arranged on the limit bolt. The section of the portion, extending into the bottom cover and opposite to the limiting bolt, of the valve shaft is square, and a fixing bolt is arranged between the bottom cover and the valve body for fastening. The limiting mechanism of the soft sealing butterfly valve is novel and compact in structural design, economical and convenient to machine, capable of completely overcoming the defects generated by a traditional valve body check block and avoiding the influence of a mechanical check block on the use of the valve, and the valve shaft is rotationally limited through the design that the limiting bolt with the self-locking nut is used for conducting rotation limiting on the valve shaft. And it is guaranteed that the butterfly plate is effectively fixed and limited when the valve is fully opened and fully closed, the opening angle is adjusted according to actual requirements, and the use requirements under various working conditions are met.

Description

Technical Field

[0001] The utility model relates to the technical field of soft-sealed butterfly valves, in particular to a soft-sealed butterfly valve limiting mechanism. Background Art

[0002] For traditional double eccentric soft-seal butterfly valves, when the valve is fully open or fully closed, in order to prevent the butterfly plate from moving from the required fixed position during normal operation, or the butterfly plate closing angle is too far to cause a poor seal, it is usually necessary to cast a mechanical stopper on the inner cavity of the valve body flow channel. The stopper is used to limit the butterfly plate from closing too far and can also affect its sealing effect. It is generally configured to cast a mechanical stopper on the inner cavity of the valve body flow channel, and the stopper position corresponds to the fully open and fully closed angle positions of the butterfly plate, forming a limit to it. However, the setting of the stopper will make it difficult or impossible to machine the inner cavity of the valve body flow channel, thereby causing the surface finish of the cavity to be rough, affecting the appearance quality of the valve, and affecting the corrosion resistance of the inner wall of the valve body and the flow of the medium. In addition, the valve body cavity stopper that is protruding relative to the flow channel will also cause medium turbulence and cavitation, increase the flow resistance coefficient, increase the pressure loss, and increase the system energy loss. The influence of cavitation on the inner wall of the valve cavity is also very large, thereby reducing the service life of the valve.

[0003] In summary, how to achieve the opening limit of the butterfly valve without affecting the valve body itself has become an issue that researchers in this field urgently need to improve. Utility Model Content

[0004] In view of the prior art, the purpose of the utility model is to provide a butterfly valve limit mechanism, which has a novel and compact structural design, is economical and convenient to manufacture, can completely solve the drawbacks of traditional valve body blocks, and ensure that the butterfly plate is effectively fixed and limited when the valve is fully open and fully closed.

[0005] In order to achieve the above objectives, the technical solution adopted by the utility model is: a soft-sealed butterfly valve limiting mechanism, including a valve body, a valve shaft and a butterfly plate, a limiting mechanism is also arranged at the bottom of the valve body, one end of the valve shaft is connected to a power mechanism, and the other end passes through the valve body and extends into the limiting mechanism, the butterfly plate is fixed to the medium flow channel part in the valve body, the limiting mechanism includes a bottom cover and a limiting bolt, a positioning nut is arranged on the limiting bolt, the cross-section of the part of the valve shaft extending into the bottom cover opposite to the limiting bolt is square, and a fixing bolt is arranged between the bottom cover and the valve body for fastening.

[0006] As a further configuration of the above scheme, a gland is further provided on the inner side of the bottom cover, the gland is bolted to the valve body, and an O-ring is provided between the inner hole of the gland and the valve shaft for sealing.

[0007] As a further configuration of the above scheme, a rear cover is further provided on the bottom cover, the rear cover is fixed relative to the bottom cover bolts, and the rear cover is arranged opposite to the valve shaft for observing the limiting fitting position of the limiting bolt and the valve shaft.

[0008] As a further configuration of the above solution, the bottom cover can be circumferentially movable relative to the valve body by loosening fixing bolts, and the valve body is provided with waist-shaped fixing holes relative to the fixing bolts.

[0009] As a further configuration of the above scheme, a coaxial valve hole is provided on the butterfly plate, the valve shaft is provided in two sections which are respectively inserted into the valve holes on the butterfly plate, and a sealing sleeve is further provided between the valve shaft and the valve body.

[0010] As a further configuration of the above solution, a valve seat is provided in the inner cavity of the valve body, and a soft sealing gasket opposite to the valve seat is provided on the butterfly plate.

[0011] Beneficial effects: The soft-sealed butterfly valve limit mechanism of the utility model has a novel and compact structural design and is economical and convenient to process. It can completely solve the drawbacks of traditional valve body blocks and ensure that the butterfly plate is effectively fixed and limited when the valve is fully open and fully closed, avoiding the influence of mechanical blocks on the use of the valve. The design of limiting the rotation of the valve shaft through a limiting bolt with a self-locking nut is more flexible than blocks and other methods, and its opening angle can be adjusted according to actual needs to meet the use requirements under various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the butterfly valve of the utility model.

[0013] Figure 2 It is a schematic diagram of the limiting mechanism of the utility model.

[0014] Figure 3 It is a schematic diagram of the working state of the limit bolt of the utility model.

[0015] Figure 4 It is a schematic diagram of the valve seat of the utility model.

[0016] Figure 5 It is a schematic diagram of the limit state of special working conditions of the utility model.

[0017] Figure numerals: 1. valve body; 2. valve shaft; 23. sealing sleeve; 3. butterfly plate; 31. valve hole; 4. limiting mechanism; 40. fixing bolt; 401. waist-shaped fixing hole; 41. bottom cover; 411. back cover; 42. limiting bolt; 43. pressure cover; 431. inner hole; 432. O-ring; 44. positioning nut; 5. medium flow channel; 7. valve seat; 9. soft sealing gasket. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] like Figure 1-5 The utility model is a soft-sealed butterfly valve limit mechanism, which includes a valve body 1, a valve shaft 2 and a butterfly plate 3. Figure 1-2 As shown in the embodiment, a limiting mechanism 4 is also provided at the bottom of the valve body 1, and one end of the valve shaft 2 is connected to a power mechanism 8. The user controls the power mechanism 8 to drive the valve shaft 2 to control the opening and closing of the valve. The other end of the valve shaft 2 penetrates the valve body 1 and extends into the limiting mechanism 4. The butterfly plate 3 is fixed to the medium flow channel 5 in the valve body 1. The butterfly plate 3 and the valve shaft 2 are fixedly arranged circumferentially and axially. The power mechanism 8 drives the stem valve shaft 2 to rotate, which drives the butterfly plate 3 to rotate to control the opening and closing of the medium flow channel 5 of the valve. The limiting mechanism 4 of the embodiment includes a bottom cover 41 and a limiting bolt 42. A positioning nut 44 is provided on the limiting bolt 42. The cross-section of the part of the valve shaft 2 extending into the bottom cover 41 opposite to the limiting bolt 42 is square. A fixing bolt 40 is arranged between the bottom cover 41 and the valve body 1 for fastening. Figure 2-3 As shown, the limit bolt 42 of this embodiment can control the extension distance of the limit bolt 42 relative to the valve shaft 2 by rotating the positioning nut 44. The front ends of multiple limit bolts 42 are against the valve shaft 2, forming rotation limits on the valve shaft 2 at multiple angles, so that the valve shaft 2 remains circumferentially fixed under the limit of the limit bolt 42, thereby stably maintaining the full open and full closed states of the valve butterfly plate 3.

[0020] As a further setting of the above scheme, Figure 1 A pressure cover 43 is also provided on the inner side of the bottom cover 41 shown. The pressure cover 43 is bolted to the valve body 1, and an O-ring 432 is provided between its inner hole 431 and the valve shaft 2 for sealing. The pressure cover 43 is used to seal with the valve shaft 2 and the valve body 1, and the elastic sealing of the O-ring 432 prevents the medium from leaking out of the medium flow channel 5 in the inner cavity of the valve body 1.

[0021] As a further arrangement of the above scheme, a rear cover 411 is further arranged on the bottom cover 41, and the rear cover 411 is fixed relative to the bottom cover 41 by bolts, and the rear cover 411 is arranged opposite to the valve shaft 2, and is used to observe the limiting fit between the limit bolt 42 and the valve shaft 2. The rear cover 411 can be made of transparent materials, such as acrylic, etc., so that the user can intuitively see the status when adjusting the limit bolt 42, while maintaining the sealing degree of the inner cavity of the bottom cover 41 to prevent outside air and water vapor from entering the bottom cover 41 and affecting the limit bolt 42 and the valve shaft 2.

[0022] As a further configuration of the above scheme, the bottom cover 41 can be circumferentially movable relative to the valve body 1 by loosening the fixing bolts 40, and the valve body 1 is provided with a waist-shaped fixing hole 401 relative to the fixing bolts 40. It is worth noting that the limiting bolts 42 of this embodiment are connected to the bottom cover 41 by threads, and the valve body 1 and the bottom cover 41 are also threaded. The difference is that the screw hole of the limiting bolt 42 is fixed, and the waist-shaped fixing hole 401 is provided on the valve body 1. Before the fixing bolts 40 lock the valve body 1 and the bottom cover 41, the bottom cover 41 can be slightly moved relative to the valve body 1. The circumferential movement can adjust the angle, so that the opening and closing angle of the butterfly valve can be fine-tuned and corrected. It can be adjusted for processing errors or working conditions with special requirements for the opening. In addition, the limit bolts 42 of the present embodiment are four, and the user can adjust the maximum extension length of the four limit bolts 42 to control the rotation angle of the valve shaft 2, including in special working conditions other than full opening and full closing, the two limit bolts 42 corresponding to the sides are deepened and the two corresponding to the sides are not deepened, so that the valve shaft 2 is kept at a half-open or other opening angle, such as Figure 5 That is, it is a schematic diagram of the cooperation between the valve shaft 2 and the limit bolt 42 when the butterfly plate 3 is in a small valve opening state of 5°. As long as the extension length of the four limit bolts 42 is controlled under the opening required by special working conditions, the rotation angle of the valve shaft 2 can be fixed. The current opening can be kept stable through the cooperation and abutment of multiple limit bolts 42. Compared with the mechanical stops in the prior art, this embodiment has more flexible adjustment characteristics.

[0023] As a further configuration of the above scheme, a coaxial valve hole 31 is provided on the butterfly plate 3, and the valve shaft 2 is configured to be two sections respectively plugged into the valve holes 31 on the butterfly plate 3, and a sealing sleeve 23 is also provided between the valve shaft 2 and the valve body 1. This embodiment adopts a method of plugging the butterfly plate 3 with two sections of valve shaft 2. Under this structure, the butterfly plate 3 and the valve shaft 2 can be processed separately, and relatively speaking, the production and processing thereof will be simpler, and the upper and lower sections of the valve shaft 2 and the butterfly plate 3 are plug-in matched, so that the butterfly plate 3 has a certain axial correction ability, and is not prone to jamming problems during sealing. The soft seal fits more tightly, reducing the unnecessary wear between the butterfly plate 3 and the valve body 1.

[0024] As a further configuration of the above solution, a valve seat 7 is provided in the inner cavity of the valve body 1 , and a soft sealing gasket 9 opposite to the valve seat 7 is provided on the butterfly plate 3 .

[0025] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A soft-seal butterfly valve limit mechanism, comprising a valve body (1), a valve shaft (2) and a butterfly plate (3), characterized in that: A limiting mechanism (4) is also provided at the bottom of the valve body (1); one end of the valve shaft (2) is connected to the power mechanism (8), and the other end passes through the valve body (1) and extends into the limiting mechanism (4); the butterfly plate (3) is fixed to the medium flow channel (5) in the valve body (1); the limiting mechanism (4) comprises a bottom cover (41) and a limiting bolt (42); a positioning nut (44) is provided on the limiting bolt (42); the cross section of the portion of the valve shaft (2) extending into the bottom cover (41) and opposite to the limiting bolt (42) is square; a fixing bolt (40) is provided between the bottom cover (41) and the valve body (1) for fastening.

2. A soft seal butterfly valve limit mechanism according to claim 1, characterized in that: A pressure cover (43) is also provided on the inner side of the bottom cover (41). The pressure cover (43) is fixed to the valve body (1) by bolts, and an O-type rubber ring (432) is provided between the inner hole (431) of the pressure cover and the valve shaft (2) for sealing.

3. A soft-seal butterfly valve limiting mechanism according to claim 1, characterized in that: A rear cover (411) is also provided on the bottom cover (41), the rear cover (411) being fixed relative to the bottom cover (41) by bolts, and the rear cover (411) is provided directly opposite to the valve shaft (2) for observing the limiting matching position of the limiting bolt (42) and the valve shaft (2).

4. A soft-seal butterfly valve limiting mechanism according to claim 1, characterized in that: The bottom cover (41) can be movably arranged in the circumferential direction relative to the valve body (1) by loosening the fixing bolts (40), and the valve body (1) is provided with a waist-shaped fixing hole (401) relative to the fixing bolts (40).

5. The soft-seal butterfly valve limiting mechanism according to claim 1, characterized in that: The butterfly plate (3) is provided with a coaxial valve hole (31), the valve shaft (2) is provided with two sections which are respectively inserted into the valve holes (31) on the butterfly plate (3), and a sealing sleeve (23) is further provided between the valve shaft (2) and the valve body (1).

6. A soft-seal butterfly valve limiting mechanism according to claim 1, characterized in that: The inner cavity of the valve body (1) is provided with a valve seat (7), and the butterfly plate (3) is provided with a soft sealing gasket (9) opposite to the valve seat (7).

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