High-reliability large-caliber high-temperature hard sealing three-eccentric center butterfly valve

Abstract

The invention discloses a high-reliability large-diameter high-temperature hard sealing three-eccentric center butterfly valve, which relates to the technical field of three-eccentric center butterfly valves and comprises a valve body, a valve plate, a valve rod and a sealing mechanism, the sealing mechanism comprises a first sealing assembly and a second sealing assembly; according to the invention, the design of the through shaft valve rod is adopted, so that the concentricity is ensured, and meanwhile, the relative position accuracy of a sealing pair is ensured to the maximum extent; spline transmission is adopted between the valve plate and the valve rod, and the fatigue life of key transmission can be prolonged; a valve plate is subjected to reinforced design, a spherical upheaval structure is adopted, the strength of the valve plate is structurally improved, meanwhile, the quick-closing requirement is comprehensively considered, the valve plate is inclined by 15 degrees, the long-short axis ratio of the valve plate is reduced, and the influence of expansion size difference on sealing is reduced; the first sealing assembly, the inner-layer sealing structure and the outer-layer sealing structure are matched to improve the sealing performance of the three-eccentric center butterfly valve.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of three-eccentric butterfly valves, and particularly relates to a high-reliability large-diameter high-temperature hard-seal three-eccentric butterfly valve. BACKGROUND

[0002] The three-eccentric hard-seal butterfly valve is a valve continuously optimized and improved according to use condition changes in a conventional butterfly valve. The evolution of the butterfly valve has experienced a centerline butterfly valve, a single-eccentric butterfly valve, a double-eccentric butterfly valve, and finally a three-eccentric butterfly valve. The first eccentricity of the three-eccentric structure is that the center of the valve rod is eccentric to the center line of the valve plate, the second eccentricity is that the center of the valve rod is eccentric to the center line of the valve body, and the third eccentricity is that the center line of the valve body is inclined to the center line of the sealing pair. The three-eccentric butterfly valve structure has an additional inclination angle compared with the double-eccentric structure, which can adjust the contact stress and make it uniformly distributed, and improve the sealing performance. Since the three-eccentric butterfly valve was invented, in order to meet the increasingly complex production needs, it has also undergone a continuous improvement and development process. The complete system of the three-eccentric butterfly valve involved in the application mainly consists of a valve body, an electro-hydraulic controller and a large torque actuator. The three-eccentric butterfly valve has the advantages of small opening and closing torque, good sealing performance, wear resistance and long service life, and has been widely used in industrial production. Therefore, a high-reliability large-diameter high-temperature hard-seal three-eccentric butterfly valve is needed.

[0003] The existing hard-seal three-eccentric butterfly valve has certain disadvantages in use. When the existing hard-seal three-eccentric butterfly valve is used in the petrochemical field, the environment in the petrochemical field is usually a high-temperature and high-pressure environment, and the petrochemical medium may be corrosive. However, the hard-seal three-eccentric butterfly valve has poor concentricity of the valve shaft, and the valve shaft and the valve plate are usually connected by a flat key. Fatigue failure of the flat key will cause the valve to fail to open and close, resulting in opening and closing resistance of the valve body. In addition, due to insufficient rigidity of the valve plate, deformation of the valve plate under the maximum pressure difference causes the seal to be not tight, and uneven expansion of the valve under high temperature causes the seal surface to be not tight, thereby easily causing the valve body to leak excessively, which cannot meet the needs of people. SUMMARY

[0004] The application aims to solve the technical problems in the prior art. To this end, the application provides a high-reliability large-diameter high-temperature hard-seal three-eccentric butterfly valve.

[0005] The utility model provides a high reliability large -diameter high temperature hard seal three eccentric butterfly valve, include: valve body, the valve plate of rotation setting in the inside of valve body and the sealing mechanism of detachable installation on valve body, be provided with with the valve rod of valve body connection and adopt through axle design on the valve body, sealing mechanism includes the first sealing assembly of setting in the inside of valve body and with valve plate connection and the second sealing assembly of setting respectively in the one side of valve body close to valve rod and adopt two layer sealing design, the inside of valve body is installed with sealing seat, the outer wall of valve plate is detachable installation with sealing seat sealed connection's sealing ring, sealing seat and sealing ring all adopt metal material to make, sealing seat sets up annular structure, sealing seat and sealing ring sealed connection realizes the block of fluid.

[0006] As a further scheme of the utility model: one end of the valve rod penetrates rotation setting in the inside of valve body, the valve rod with valve plate adopts rectangular outer spline fixed connection.

[0007] As a further scheme of the utility model: the valve plate is in the center cavity of valve body, and the valve plate sets up spherical bulge structure, the valve plate selects 15 inclination angle, and reduces the influence of expansion size difference to sealing by reducing the major axis ratio of valve plate.

[0008] As a further scheme of the utility model: the both sides of valve body are provided with the rib plate, and two groups of rib plate press against first limit sleeve and second limit sleeve respectively, first limit sleeve is fixedly installed with the first high temperature bearing corresponding with first sealing assembly, and second limit sleeve is fixedly installed with the second high temperature bearing matched with second sealing assembly.

[0009] As a further scheme of the utility model: the first sealing assembly includes the flange cover connected with valve body and the first sealing gasket between flange cover and first high temperature bearing, the flange cover is connected with first high temperature bearing in alignment, the first sealing gasket can be set as flexible graphite gasket, and the valve body and flange cover are fixed through stud and hexagon nut.

[0010] As a further scheme of the utility model: the second sealing assembly is divided into inner layer sealing structure and outer layer sealing structure, the second sealing gasket is arranged between the inner layer sealing structure and the second high temperature bearing, the valve body is provided with a packing gland for sealing the outer layer sealing structure, and the second sealing gasket can be set as a flexible graphite gasket.

[0011] As a further scheme of the utility model: the inner layer sealing structure includes a plurality of first packing and a packing sleeve arranged radially outside the first packing, wherein a plurality of first packing is provided with a spacing ring for separation, and the inner side wall of the first packing is attached to the outer wall of the valve rod.

[0012] As a further scheme of the present application, the outer sealing structure comprises a second packing adhering to the valve rod and a third packing respectively arranged on both sides of the second packing and separating the second packing from other parts.

[0013] As a further scheme of the present application, a packing box for separating packing is arranged between the inner sealing structure and the outer sealing structure, and the outer sealing structure can be compacted in the packing box, so that the inner sealing structure and the outer sealing structure can fully ensure the sealing performance.

[0014] As a further scheme of the present application, the sealing mechanism further comprises a first wrapped gasket arranged between the flange cover and the valve body and a second wrapped gasket arranged between the packing box and the valve body.

[0015] As a further scheme of the present application, the packing gland is fixed on the packing box through a stud bolt and a hexagonal nut, a butterfly spring for extruding the second sealing assembly is arranged on the stud bolt, the butterfly spring is fastened with the hexagonal nut, and the packing box is fixed with the valve body through the stud bolt.

[0016] As a further scheme of the present application, an end cover is mounted on one end of the valve body close to the valve rod through a stud bolt and a hexagonal nut, a straight-through pressure injection oil cup with a stop valve is detachably mounted on one side of the valve body close to the end cover, the straight-through pressure injection oil cup penetrates through the valve body and is arranged in a packing sleeve, a lubricating cavity is arranged on the packing sleeve, and the straight-through pressure injection oil cup can inject lubricating oil into the lubricating cavity.

[0017] As a further scheme of the present application, two groups of steam injection channels are symmetrically and vertically mounted on the valve body, one end of the two groups of steam injection channels penetrates through the valve body and is respectively connected with a first high-temperature bearing and a second high-temperature bearing, a cooling cavity is arranged on each of the first high-temperature bearing and the second high-temperature bearing, the steam injection channels can inject low-temperature steam to cool the leaked substances, and damage to the packing and other components caused by high-temperature leaked substances is avoided.

[0018] As a further scheme of the present application, the valve body is arranged between two pipes, one end of the valve rod away from the valve body is connected with a driving structure, an external spline connected with the driving structure is mounted on the valve rod, and the valve plate is controlled to rotate through the driving structure.

[0019] Compared with the prior art, the present application has the following beneficial effects: (1) The valve body and sealing mechanism are arranged, the through shaft valve rod is adopted, the relative position accuracy of the sealing pair is guaranteed to the maximum while the concentricity is guaranteed, the spline transmission is adopted between the valve plate and the valve rod, the fatigue life of the key transmission can be improved, the valve plate is strengthened, the spherical bulge structure is adopted, the valve plate strength is improved from the structure, the 15-degree inclination angle is selected for the valve plate, the long and short shaft ratio of the valve plate is reduced, the influence of the expansion size difference on the sealing is reduced, the first sealing assembly, the inner sealing structure and the outer sealing structure are matched to improve the sealing performance of the three eccentric butterfly valve, the steam injection channel can reduce the temperature of the leakage material to 300 DEG C to avoid the high temperature damage to the packing, the butterfly spring is used under the fixing bolt of the packing gland, the packing can be extruded for a long time, and the service life of the packing is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall structural diagram of the application.

[0021] Figure 2 It is the enlarged view of A in the application. Figure 1

[0022] Figure 3 It is the enlarged view of B in the application. Figure 1

[0023] Figure 4 It is the partial structural diagram of the valve body when the valve body is closed.

[0024] Figure 5 It is the enlarged view of C in the application. Figure 4

[0025] Figure 6 It is the partial structural diagram of the valve body when the valve body is opened.

[0026] Figure 7 It is the side view of the valve body in the application.

[0027] In the drawing: 1, valve body; 2, valve plate; 3, valve rod; 4, first sealing assembly; 5, second sealing assembly; 6, first limiting sleeve; 7, second limiting sleeve; 8, first high temperature bearing; 9, second high temperature bearing; 10, flange cover; 11, first sealing gasket; 12, inner sealing structure; 13, outer sealing structure; 14, second sealing gasket; 15, packing gland; 16, first packing; 17, packing sleeve; 18, spacing ring; 19, second packing; 20, third packing; 21, packing box; 22, first winding type gasket; 23, second winding type gasket; 24, butterfly spring; 25, end cover; 26, straight-through type pressure injection oil cup; 27, steam injection channel; 28, external spline; 29, sealing seat; 30, sealing ring. DETAILED DESCRIPTION​​​

[0028] The technical solutions of the present application will be described clearly and completely in combination with the embodiments below, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person of ordinary skill in the art without making creative labor belong to the protection scope of the present application.

[0029] Embodiment one Please refer to Figure 1 - Figure 7 The application provides a high-reliability large-diameter high-temperature hard-seal three-eccentric butterfly valve, which comprises a valve body 1, a valve plate 2 rotatably arranged in the valve body 1 and a sealing mechanism detachably mounted on the valve body 1. A valve rod 3 connected with the valve plate 2 and adopting a through shaft design is arranged on the valve body 1. The sealing mechanism comprises a first sealing assembly 4 arranged in the valve body 1 and connected with the valve plate 2 and a second sealing assembly 5 arranged on one side of the valve body 1 close to the valve rod 3 and adopting a two-layer sealing design. A sealing seat 29 is arranged in the valve body 1, and a sealing ring 30 in sealing connection with the sealing seat 29 is detachably arranged on the outer wall of the valve plate 2. The sealing seat 29 and the sealing ring 30 are both made of metal material, the sealing seat 29 is arranged in an annular structure, and the sealing seat 29 and the sealing ring 30 are in sealing connection to block the fluid.

[0030] In the application, one end of the valve rod 3 penetrates through the valve body 1 and is rotatably arranged in the valve body 1. The valve rod 3 is fixedly connected with the valve plate 2 through a rectangular external spline. The three-eccentric butterfly valve is redesigned and calculated in the three-eccentric part to make the generatrix on one side of the sealing seat 29 parallel to the center line of the valve body 1, thereby effectively preventing the material accumulation at the sealing part.

[0031] In the application, the valve plate 2 is located in the central cavity of the valve body 1, and the valve plate 2 is arranged in a spherical protruding structure. The valve plate 2 is selected to have an inclination angle of 15°, and the length-to-short-axis ratio of the valve plate 2 is reduced to reduce the influence of the expansion size difference on the sealing.

[0032] In the application, the valve body 1 is provided with rib plates on both sides. The two groups of rib plates respectively abut against a first limiting sleeve 6 and a second limiting sleeve 7. The first limiting sleeve 6 is fixedly installed with a first high-temperature bearing 8 corresponding to the first sealing assembly 4. The second limiting sleeve 7 is fixedly installed with a second high-temperature bearing 9 matched with the second sealing assembly 5.

[0033] The first sealing assembly 4 in the application comprises a flange cover 10 connected with the valve body 1 and a first sealing gasket 11 arranged between the flange cover 10 and the first high-temperature bearing 8, the flange cover 10 is connected with the first high-temperature bearing 8 in alignment, one end of the first high-temperature bearing 8 is arranged in the valve body 1 and connected with the end of the valve stem 3 penetrating through the valve body 1, the first sealing gasket 11 can be arranged as a flexible graphite gasket, and the valve body 1 and the flange cover 10 are fixed by means of studs and hexagonal nuts.

[0034] The second sealing assembly 5 in the application is divided into an inner layer sealing structure 12 and an outer layer sealing structure 13, a second sealing gasket 14 is arranged between the inner layer sealing structure 12 and the second high-temperature bearing 9, and a packing gland 15 for sealing the outer layer sealing structure 13 is arranged on the valve body 1, and the second sealing gasket 14 can be arranged as a flexible graphite gasket.

[0035] The inner layer sealing structure 12 in the application comprises a plurality of groups of first packing 16 and a packing sleeve 17 arranged on the radial outer side of the first packing 16, wherein a spacer ring 18 is arranged in the middle of the plurality of groups of first packing 16, and the inner side wall of the first packing 16 is attached to the outer wall of the valve stem 3.

[0036] The outer layer sealing structure 13 in the application comprises a second packing 19 attached to the valve stem 3 and a third packing 20 arranged on both sides of the second packing 19 and separating the second packing 19 from other parts.

[0037] The inner layer sealing structure 12 and the outer layer sealing structure 13 in the application are provided with a packing box 21 for separating the packing, and the outer layer sealing structure 13 can be compacted in the packing box 21, so that the inner layer sealing structure 12 and the outer layer sealing structure 13 can fully guarantee the sealing performance.

[0038] The sealing mechanism in the application further comprises a first wrapped gasket 22 arranged between the flange cover 10 and the valve body 1 and a second wrapped gasket 23 arranged between the packing box 21 and the valve body 1.

[0039] The packing gland 15 in the application is fixed on the packing box 21 by means of studs and hexagonal nuts, a butterfly spring 24 for extruding the second sealing assembly 5 is arranged on the stud, the butterfly spring 24 is fastened with the hexagonal nut, and the packing box 21 is fixed with the valve body 1 by means of the stud.

[0040] The end cover 25 is installed on one end of the valve body 1 close to the valve stem 3 by means of studs and hexagonal nuts in the application, and the straight-through type pressure injection oil cup 26 with a stop valve is detachably installed on one side of the valve body 1 close to the end cover 25, the straight-through type pressure injection oil cup 26 penetrates through the valve body 1 and is arranged in the packing sleeve 17, a lubricating cavity is arranged on the packing sleeve 17, and the straight-through type pressure injection oil cup 26 can inject lubricating oil into the lubricating cavity.

[0041] Two groups of steam injection channels 27 are symmetrically and vertically installed on the valve body 1, one end of the two groups of steam injection channels 27 penetrates through the valve body 1 and is connected with the first high-temperature bearing 8 and the second high-temperature bearing 9 respectively, the first high-temperature bearing 8 and the second high-temperature bearing 9 are both provided with cooling cavities, the steam injection channels 27 can inject low-temperature steam to cool the leakage, so as to avoid damage to the packing and other components caused by high-temperature leakage.

[0042] The valve body 1 is arranged between two pipes, one end of the valve rod 3 away from the valve body 1 is connected with a driving structure, the valve rod 3 is provided with an external spline 28 connected with the driving structure, and the valve plate 2 is controlled to rotate through the driving structure.

[0043] In summary, the driving structure is started, the valve rod 3 is driven to rotate through the external spline 28, the valve rod 3 drives the valve plate 2 to rotate in the valve body 1, so as to open the three-eccentric butterfly valve, and the fluid passes through, when the driving structure is reversed, the valve rod 3 controls the valve plate 2 to rotate reversely, so as to close the three-eccentric butterfly valve, and the fluid is blocked by the valve plate 2.

[0044] When the second sealing assembly 5 needs to be lubricated, the lubricating oil is injected into the lubricating cavity through the straight-through type injection oil cup 26, so that the lubricating oil immerses the inner layer sealing structure 12 and the outer layer sealing structure 13 for lubrication, when cooling is needed, low-temperature steam is injected into the cooling cavity through the steam injection channel 27 for cooling.

[0045] The first high-temperature bearing 8 is installed to one side of the valve body 1, the first sealing gasket 11 is connected with the other end of the first high-temperature bearing 8, the flange cover 10 is connected with the valve body 1 and connected with the first high-temperature bearing 8, the flange cover 10 is fixed to the valve body 1 through the stud and the hexagon nut, the second high-temperature bearing 9 is installed to the other side of the valve body 1, the second sealing gasket 14 is connected with the second high-temperature bearing 9, the inner layer sealing structure 12 is pressed into the other side of the valve body 1 and connected with the second high-temperature bearing 9, that is, the first packing 16, the packing sleeve 17 and the spacer ring 18 are assembled into the inner layer sealing structure 12, and the second packing 19 and the third packing 20 are assembled into the outer layer sealing structure 13, the packing gland 15 is connected with the inner layer sealing structure 12, the outer layer sealing structure 13 is connected with the inner side wall of the packing gland 21, the packing gland 15 is fixed to the valve body 1, the packing gland 15 is pressed to the outer layer sealing structure 13, and the valve body 1 is sealed; The end cover 25 is installed to the valve body 1, and the straight-through type injection oil cup 26 and the steam injection channel 27 are installed to the valve body 1, the external spline 28 is installed to the valve rod 3, so that the driving structure is connected with the valve rod 3 through the external spline 28 and controls the valve plate 2 to rotate.

[0046] The above examples are only used to illustrate the technical method of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present application.

Claims

1. A high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve, characterized in that: include: A valve body (1), a valve plate (2) arranged inside the valve body (1), a valve stem (3) rotatably arranged inside the valve body (1) and controlling the rotation of the valve plate (2), and a sealing mechanism detachably mounted on the valve body (1); The sealing mechanism comprises a first sealing component (4) arranged on the valve body (1) and a second sealing component (5) respectively arranged on one side of the valve body (1) close to the valve stem (3) and adopting a two-layer sealing design.

2. A high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 1, characterized in that: The valve plate (2) is configured as a spherical raised structure; The valve plate (2) is inclined at an angle of 15°, and the length-to-short axis ratio of the valve plate (2) itself is reduced.

3. A high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 2, characterized in that: The sealing mechanism further comprises a first limiting sleeve (6) and a second limiting sleeve (7) respectively arranged on both sides of the valve body (1); The sealing mechanism further comprises a first high-temperature bearing (8) respectively arranged corresponding to the first limiting sleeve (6) and the first sealing assembly (4), and a second high-temperature bearing (9) respectively matched with the second limiting sleeve (7) and the second sealing assembly (5).

4. A high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 3, characterized in that: The first sealing assembly (4) comprises a flange cover (10) connected to the valve body (1) and a first sealing gasket (11) arranged between the flange cover (10) and the first high-temperature bearing (8).

5. A high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 3, characterized in that: The second sealing component (5) is divided into an inner sealing structure (12) and an outer sealing structure (13); A second sealing gasket (14) is provided between the inner sealing structure (12) and the second high-temperature bearing (9); The valve body (1) is provided with a packing gland (15) for sealing the outer sealing structure (13); A stuffing box (21) for separating fillers is provided between the inner sealing structure (12) and the outer sealing structure (13).

6. A high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 5, characterized in that: The inner sealing structure (12) includes a plurality of groups of first fillers (16) and a filler sleeve (17) arranged radially outside the first fillers (16); A spacer ring (18) is provided between the plurality of groups of first fillers (16) for separation.

7. A high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 6, characterized in that: The outer sealing structure (13) comprises a second filler (19) fitted with the valve stem (3) and a third filler (20) respectively arranged on both sides of the second filler (19) and separating the second filler (19) from other parts.

8. A high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 7, characterized in that: The sealing mechanism further comprises a first wound gasket (22) arranged between the flange cover (10) and the valve body (1), and a second wound gasket (23) arranged between the stuffing box (21) and the valve body (1).

9. The high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 1, characterized in that: An end cap (25) is detachably mounted on one end of the valve body (1) close to the valve stem (3); A straight-through pressure-injection oil cup (26) for lubricating the second sealing component (5) is detachably mounted on one side of the valve body (1) close to the end cover (25).

10. The high reliability, large diameter, high temperature, hard-sealed triple eccentric butterfly valve according to claim 1, characterized in that: Two groups of steam injection channels (27) for cooling treatment are symmetrically and vertically mounted on the valve body (1).

Images