Five-eccentric high-temperature hard sealing butterfly valve

Abstract

The utility model discloses a five-eccentric high-temperature hard sealing butterfly valve which comprises a valve body and a butterfly plate, a valve seat is arranged on the valve body, a sealing ring corresponding to the valve seat is arranged on the butterfly plate, a spherical cambered surface structure is arranged on an outer ring of the sealing ring, a valve shaft is further arranged in the valve body and penetrates through the valve body to be fixed with the butterfly plate, and a bottom cover is further arranged on the valve body. One end of the valve shaft penetrates through the valve body and abuts against the bottom cover. Compared with the prior art, the five-eccentric high-temperature hard sealing butterfly valve has the advantages that the spherical cambered surface structure and the perfect circular sealing surface of the valve seat form a linear sealing pair, forced linear sealing is formed based on medium pressure and torque applied by the valve shaft, the contact area of the linear sealing pair is small, the sealing effect is larger under the same torque force and pressure, and the sealing effect is better. And the perfect circular sealing specific pressure is uniform, the sealing zero-leakage performance is improved, the sealing device is particularly suitable for the working conditions of high temperature, ultralow temperature and temperature cross change, deformation generated by a sealing pair under the height difference is uniform, and the stability of the sealing performance can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a five-eccentric high-temperature hard-sealed butterfly valve. Background Art

[0002] Usually in the valve industry, butterfly valve is one of the commonly used valve types. Butterfly valves have been continuously improved from centerline butterfly valves (single eccentric) to double eccentric butterfly valves, and then to triple eccentric butterfly valves. After each improvement, the torque on the valve stem is continuously reduced, making it easier to open and able to meet more working conditions. However, although the triple eccentric is a very good structure, compared with the single eccentric and double eccentric, the opening torque is greatly reduced, but the reverse sealing effect is not ideal, and it is difficult to meet the working requirements of two-way sealing. In addition, the sealing surface of the three-eccentric butterfly valve is greatly worn during the closing process, resulting in a shorter service life of the valve. On this basis, the four-eccentric butterfly valve adds an eccentric structure to reduce the mutual wear of the sealing surface. However, its sealing effect is still insufficient and needs to be improved. Utility Model Content

[0003] In view of the prior art, the purpose of the utility model is to provide a high-temperature hard-sealed butterfly valve with a five-eccentric arrangement. The butterfly valve of this embodiment can reduce the wear of the sealing surface, and can also scrape and clean the sealing mating surface during the valve closing process to improve the sealing effect.

[0004] In order to achieve the above objectives, the technical solution adopted by the utility model is: a five-eccentric high-temperature hard-sealed butterfly valve, including a valve body and a butterfly plate. The valve body is also provided with a valve seat, and the butterfly plate is provided with a sealing ring corresponding to the valve seat. The surfaces of the valve seat and the sealing ring opposite to each other are arranged in an inclined cone, and a spherical arc surface structure is arranged on the outer ring of the sealing ring. A valve shaft is also arranged in the valve body, and the valve shaft passes through the valve body and is fixed to the butterfly plate, and a bottom cover is also arranged on the valve body, and one end of the valve shaft passes through the valve body and abuts against the bottom cover.

[0005] As a further configuration of the above scheme, a heat dissipation portion is also provided on the valve body. The heat dissipation portion is located between the power mechanism and the main flow cavity of the valve body and includes a plurality of high-temperature heat sinks. The high-temperature heat sinks are used to enhance the heat exchange between the valve body and the air and reduce the temperature transmitted to the power mechanism.

[0006] As a further configuration of the above scheme, a sealing assembly is also provided on the valve body, and the sealing assembly includes packing, a compression sleeve, a compression cover and a stud for fixing the compression cover to the valve body. A disc spring is also sleeved on the stud, and the disc spring is used to push the compression cover toward the compression sleeve.

[0007] As a further configuration of the above solution, the valve shaft is axially movable relative to the valve body, and the bottom cover is used to limit the axial position of the valve shaft.

[0008] As a further configuration of the above solution, a shaft sleeve is further provided on the valve shaft, the shaft sleeve is located between the valve shaft and the valve body, and a wear-resistant ring sleeve is further provided on the shaft sleeve.

[0009] Beneficial effect: Compared with the prior art, the five-eccentric high-temperature hard-sealed butterfly valve of the utility model forms a line sealing pair by setting a spherical arc surface structure and a perfect circular sealing surface of the valve seat, and forms a forced line seal based on the medium pressure and the torque applied by the valve shaft. The contact area of ​​the line sealing pair is small, and the sealing effect is greater under the same torque and pressure. The perfect circular seal has a uniform specific pressure, which improves the zero leakage performance of the seal. It is especially suitable for working conditions of high temperature, ultra-low temperature and temperature cross-change. The deformation of the sealing pair under the height difference is uniform, which can ensure the stability of the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the five-eccentric butterfly valve of the utility model.

[0011] Figure 2 It is the internal schematic diagram of the five-eccentric butterfly valve of the utility model.

[0012] Figure 3 This is the schematic diagram of the eccentric structure of the five-eccentric butterfly valve of the utility model.

[0013] Figure 4 This is the sealing matching diagram of the butterfly plate and valve seat of the utility model.

[0014] Figure 5 This is a schematic diagram of the sealing component structure of the utility model.

[0015] Figure 6 It is a schematic diagram of the bottom cover structure of the valve body of the utility model.

[0016] Figure numerals: 1. valve body; 10. high-temperature heat sink; 11. power mechanism; 12. sealing assembly; 121. packing; 122. pressing sleeve; 123. pressing cover; 124. stud; 125. disc spring; 3. valve seat; 4. sealing ring; 5. spherical arc surface structure; 6. valve shaft; 61. shaft sleeve; 62. wear-resistant ring sleeve; 7. bottom cover. DETAILED DESCRIPTION

[0017] 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.

[0018] like Figure 1-6A five-eccentric high-temperature hard-sealed butterfly valve is shown, comprising a valve body 1 and a butterfly plate 2. A valve seat 3 is also provided on the valve body 1. A sealing ring 4 is provided on the butterfly plate 2 corresponding to the valve seat 3. The surfaces opposite to the valve seat 3 and the sealing ring 4 are arranged in an oblique cone. A spherical arc surface structure 5 is arranged on the outer ring of the sealing ring 4. A valve shaft 6 is also provided in the valve body 1. The valve shaft 6 passes through the valve body 1 and is fixed to the butterfly plate 2. A bottom cover 7 is also provided on the valve body 1. One end of the valve shaft 6 passes through the valve body 1 and abuts against the bottom cover 7.

[0019] As a further configuration of the above scheme, a heat dissipation portion is also provided on the valve body 1. The heat dissipation portion is located between the power mechanism 11 and the main flow cavity of the valve body 1 and includes a plurality of high-temperature heat sinks 10. The high-temperature heat sinks 10 are used to enhance the heat exchange between the valve body 1 and the air and reduce the temperature transmitted to the power mechanism 11.

[0020] As a further configuration of the above solution, the valve body 1 is further provided with a sealing component 12, such as Figure 5 The sealing assembly 12 of the present embodiment shown includes a packing 121, a pressing sleeve 122, a pressing cover 123 and a stud 124 for fixing the pressing cover 123 to the valve body 1. The stud 124 is also sleeved with a disc spring 125, and the disc spring 125 is used to push the pressing cover 123 against the pressing sleeve 122 to achieve a long-term and effective sealing strength effect.

[0021] As a further arrangement of the above scheme, the valve shaft 6 is axially movable relative to the valve body 1, the bottom cover 7 is used to limit the axial position of the valve shaft 6, the valve shaft 6 is also sleeved with a shaft sleeve 61, the shaft sleeve 61 is located between the valve shaft 6 and the valve body 1, and the shaft sleeve 61 is also provided with a wear-resistant ring sleeve 62, the wear-resistant ring sleeve 62 is located between the valve shaft 6 and the shaft sleeve 61, radially replacing the direct friction between the shaft sleeve 61 and the valve shaft 6, and axially the folded edge of the wear-resistant ring sleeve 62 is isolated between the butterfly plate 2 and the shaft sleeve 61, replacing the direct friction between the shaft sleeve 61 and the butterfly plate 2, and the wear-resistant ring sleeve 62 can be made of fluoroplastics such as FEP (F46) and PCTFE (F3), thereby reducing the wear inside the valve body 1.

[0022] Embodiment: The five-eccentric high-temperature hard-sealed butterfly valve of this embodiment includes a valve body 1 with a power mechanism 11, a butterfly plate 2, and a high-temperature heat sink 10 is also provided on the valve body 1 to reduce the high temperature of the medium in the valve cavity from affecting the power mechanism 11. In addition, based on the existing eccentric butterfly valve, the butterfly valve of this embodiment has a five-fold eccentric structure setting, thereby improving the use effect of the valve. The five eccentricities are as follows: Figure 3 Shown:

[0023] Eccentricity 1: Axial eccentricity, the valve shaft 6 is located behind the valve seat 3, so that the seal can completely and tightly surround the entire valve seat 3;

[0024] Eccentricity 2: radial eccentricity, the center of the valve shaft 6 deviates from the center line of the valve body 1, reducing the forced squeezing and scraping effect between the sealing ring 4 and the valve seat 3 when the valve is opened and closed;

[0025] Eccentricity 3: Angle eccentricity, the center axis of the elliptical cone of the valve seat 3 deviates from the center line of the flow channel of the valve body 1, which plays a role in eliminating excessive friction interference of the sealing pair during opening and closing. The elliptical cone is beveled at a specific angle to form a perfect circular sealing surface. The angle of the elliptical cone surface is not a constant value, that is, α≠β. Figure 3 ;

[0026] Eccentricity 4: Position eccentricity, such as Figure 3 The oblique section of the elliptical cone is changed into a perfect circle, so that the sealing cross section of the valve seat 3 is a perfect circle geometry, so that the flow area is larger and the circumferential sealing pressure is more uniform;

[0027] Eccentricity 5: Forced line seal. The five-eccentric butterfly valve is derived from the four-eccentric butterfly valve. The valve seat 3 sealing surface of the five-eccentric butterfly valve is the same as the four-eccentric structure, but the sealing surface of the sealing ring 4 is changed from an eccentric right conical curved plane to a special-shaped spherical arc surface structure 5. The spherical arc sealing surface and the right circular sealing surface of the valve seat form a line seal pair. The torque applied by the medium pressure and the valve shaft 6 forms a forced line seal. Since the contact area of ​​the line seal pair is very small, the sealing pressure ratio obtained under the same torque force and pressure is large, and the right circular sealing pressure ratio is uniform, which is easy to ensure the performance of zero leakage. The five-eccentric forced line seal pair, under high temperature, ultra-low temperature and temperature alternating conditions, the sealing pair deforms evenly under thermal expansion and contraction, maintaining stable sealing performance.

[0028] Furthermore, the valve seat 3 provided on the valve body 1 of this embodiment and the sealing ring 4 correspondingly provided on the butterfly plate 2 are provided with an oblique cone surface, and the outer ring of the sealing ring 4 is provided with a spherical arc surface structure 5 which abuts against the valve seat 3. The spherical arc sealing surface and the round sealing surface of the valve body seat as described above form a line sealing pair. A forced line seal is formed by the medium pressure and the torque applied by the valve shaft. Since the contact area of ​​the line sealing pair is very small, the sealing pressure ratio obtained under the same torque force and pressure is large, and the round sealing pressure ratio is uniform, which is easy to ensure the performance of zero leakage. In addition, the valve seat is a round sealing surface with an elliptical cone bevel cut. Therefore, the sealing ring and the valve seat form a forced line sealing pair. When the butterfly plate is fully opened, it is difficult for the medium to wash and wear the spherical arc sealing surface, and the dust particle medium cannot accumulate on the sealing surface. When the butterfly plate is close to closing, the spherical arc surface flange, like a scraper, will scrape off the dust particle medium accumulated on the sealing surface of the clean valve seat, so that the butterfly valve always maintains good sealing performance.

[0029] A bottom cover 7 is also provided at the bottom of the valve body 1 of the present embodiment. One end of the valve shaft 6 passes through the valve body 1 and abuts against the bottom cover 7. The bottom cover 7 is used to limit the axial movement of the valve shaft 6. In the present embodiment, the valve shaft 6 can perform slight axial movement. This arrangement can alleviate the problem of jamming between the butterfly plate 2 and the valve seat 3, so that the butterfly plate 2 can produce a certain adaptive movement based on the characteristics of its own key connection when the seal rotates relatively, thereby obtaining a better sealing effect.

[0030] 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 five-eccentric high-temperature hard-sealed butterfly valve, characterized in that: The invention comprises a valve body (1) and a butterfly plate (2). The valve body (1) is also provided with a valve seat (3). The butterfly plate (2) is provided with a sealing ring (4) corresponding to the valve seat (3). The surfaces of the valve seat (3) and the sealing ring (4) opposite to each other are arranged in an inclined conical surface. The outer ring of the sealing ring (4) is provided with a spherical arc surface structure (5). A valve shaft (6) is also provided in the valve body (1). The valve shaft (6) passes through the valve body (1) and is fixed to the butterfly plate (2). A bottom cover (7) is also provided on the valve body (1). One end of the valve shaft (6) passes through the valve body (1) and abuts against the bottom cover (7).

2. A five-eccentric high-temperature hard-sealed butterfly valve according to claim 1, characterized in that: The valve body (1) is also provided with a heat dissipation portion, the heat dissipation portion being located between the power mechanism (11) and the main flow cavity of the valve body (1) and comprising a plurality of high-temperature heat dissipation fins (10), the high-temperature heat dissipation fins (10) being used to enhance heat exchange between the valve body (1) and air and to reduce the temperature transmitted to the power mechanism (11).

3. A five-eccentric high-temperature hard-sealed butterfly valve according to claim 1, characterized in that: The valve body (1) is also provided with a sealing assembly (12), the sealing assembly (12) comprising a packing (121), a pressing sleeve (122), a pressing cover (123), and a stud (124) for fixing the pressing cover (123) to the valve body (1), the stud (124) is also sleeved with a disc spring (125), the disc spring (125) being used to push the pressing cover (123) toward the pressing sleeve (122).

4. A five-eccentric high-temperature hard-sealed butterfly valve according to claim 1, characterized in that: The valve shaft (6) is axially movable relative to the valve body (1), and the bottom cover (7) is used to limit the axial position of the valve shaft (6).

5. The five-eccentric high-temperature hard-sealed butterfly valve according to claim 1 is characterized in that: The valve shaft (6) is also sleeved with a shaft sleeve (61), the shaft sleeve (61) is located between the valve shaft (6) and the valve body (1), and a wear-resistant ring sleeve (62) is also provided on the shaft sleeve (61).

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