CN210344320U

CN210344320U - Three-eccentric butterfly valve with self-adaptive sealing ring

Info

Publication number: CN210344320U
Application number: CN201921160367.4U
Authority: CN
Inventors: 黄容; 王兵
Original assignee: Dong Fang Heng Yun Electrical Machinery Co ltd
Current assignee: Dong Fang Heng Yun Electrical Machinery Co ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-04-17
Anticipated expiration: 2029-07-23

Abstract

The utility model discloses a three eccentric butterfly valves with self-adaptation sealing washer belongs to valve technical field, including disk seat, valve body, valve plate, valve shaft and valve rod, its characterized in that: the valve plate is provided with a sealing ring matched with the valve seat; the sealing ring is clamped and fixed with a gland arranged on the valve plate through the valve plate; the gland is fixed with the valve plate through a gland bolt; the outer diameter of the valve plate is larger than the inner diameter of the sealing ring and is smaller than one half of the sum of the inner diameter and the outer diameter of the sealing ring; the inner wall of the valve seat is matched with the outer wall of the sealing ring to form a sealing surface, and the sealing surface is a conical surface; the seal ring is of a multilayer structure in the radial direction and is composed of rigid layers and flexible layers in an alternating mode. The sealing ring adopts a multilayer structure formed by alternating rigid materials and flexible materials, the rigid material layer in the sealing ring generates displacement by utilizing the deformation generated by the flexible material layer in the sealing ring, and the compensation of a gap generated by the abrasion of the sealing surface is realized by utilizing the characteristics of a conical sealing surface of a three-eccentric center butterfly valve.

Description

Three-eccentric butterfly valve with self-adaptive sealing ring

Technical Field

The utility model relates to a three eccentric butterfly valves, concretely relates to three eccentric butterfly valves with self-adaptation sealing washer belongs to valve technical field.

Background

A hard-sealing triple-eccentric butterfly valve is a pipeline opening and closing device widely applied to the fields of water supply, heat supply, chemical engineering, water conservancy and the like at present, and is sealed by matching a valve seat with a valve plate sealing ring. However, when the hard-seal triple-eccentric butterfly valve is applied to the fields of coal chemical industry, sewage treatment and the like, because the medium passing through the pipeline is not pure water any more, the medium contains impurities and even is slurry with particles, the medium easily wears a sealing surface matched between the valve seat and the sealing ring, the sealing performance of the valve is affected, and even leakage occurs, and at the moment, the sealing ring or the valve seat needs to be replaced. When this kind of butterfly valve had just led to having led to this kind of butterfly valve to use in fields such as chemical industry, sewage treatment, valve seal structure life is short, and use cost is high, the problem that production efficiency reduces appears.

Chinese patent CN207796121U discloses a corrosion-resistant electric butterfly valve of multilayer elastic sealing sheet, which comprises a valve body, the valve body includes the valve casing, the valve casing encircles the regional valve chamber that forms that seals and enclose, the both ends of valve casing are provided with the import that supplies the material to get into the valve chamber respectively and discharge the export in valve chamber, the valve body still includes: the check ring is arranged on the inner wall of the valve shell; the valve plate is arranged in the valve cavity, can rotate towards one side of the retainer ring in the valve cavity and is matched with the retainer ring; a plurality of layers of sealing sheets disposed at the edges of the valve plate; when the valve plate rotates towards one side of the retainer ring and is matched with the retainer ring, the sealing piece is in contact fit with the retainer ring. Although the chinese patent CN207796121U adopts the arrangement of multiple layers of sealing rings, actually forms multiple sealing layers, and improves the sealing effect, because the sealing rings are all rigid layers, after the sealing rings are worn, automatic compensation cannot be realized, the sealing rings still have to be replaced to continue to be used, and the service life of the sealing rings is not significantly increased. Meanwhile, the retainer ring (namely the valve seat) of CN207796121U is fixedly arranged, so that the replacement is difficult.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a three eccentric butterfly valve with self-adaptation sealing washer, the sealing washer adopts by rigid material and the alternating multilayer structure of flexible material, the medium produces the flexible material layer and produces deformation in the pressure messenger valve plate sealing washer when utilizing the valve to close the medium, let the rigid material layer in the sealing washer produce the displacement, and utilize the sealed face of toper of three eccentric butterfly valves (reduce gradually along medium flow direction diameter promptly), realize the compensation to the gap that sealed face wearing and tearing produced, reach extension seal structure life's purpose.

The utility model discloses a following technical scheme realizes: the utility model provides a three eccentric butterfly valves with self-adaptation sealing washer, includes disk seat, valve body, valve plate, valve shaft and valve rod, its characterized in that: the valve plate is provided with a sealing ring matched with the valve seat; the sealing ring is clamped and fixed with a gland arranged on the valve plate through the valve plate; the gland is fixed with the valve plate through a gland bolt; the outer diameter of the valve plate is larger than the inner diameter of the sealing ring and is smaller than one half of the sum of the inner diameter and the outer diameter of the sealing ring; the inner wall of the valve seat is matched with the outer wall of the sealing ring to form a sealing surface, and the sealing surface is a conical surface; the seal ring is of a multilayer structure in the radial direction and is composed of rigid layers and flexible layers in an alternating mode. The sealing structure of the common hard sealing butterfly valve inevitably generates a gap on the sealing surface due to abrasion under the long-term friction action of a medium, so that the sealing effect of the sealing surface is reduced, and leakage occurs. And the utility model discloses a three eccentric butterfly valve, the sealing washer adopts the multilayer structure of rigid material and flexible material layering combination, and the external diameter of sealing washer is greater than the external diameter of valve plate, make the valve close the back, the sealing washer directly receives the pressure that comes from the medium, flexible material layer in the sealing washer is upwards compressed and is produced deformation, and then the rigid material layer that makes the valve plate sealing washer can follow the direction removal that the medium flows, utilize the sealed conical characteristics of personally submitting of disk seat inner circle simultaneously (the diameter of sealed face reduces along the flow direction of medium gradually promptly), the automatic compensation in the gap that the valve plate sealing washer produced to wearing and tearing has been realized. Meanwhile, the flexible material layer is compressed in the radial direction and expanded in the direction perpendicular to the medium flowing direction, and the pores generated by abrasion of the sealing surface are further compensated.

Furthermore, the valve body is provided with a valve seat positioning piece; the valve seat positioning part is at least partially positioned in the valve body; the valve seat is positioned in the valve body and is fixed on the valve seat positioning piece through a valve seat bolt.

Still further, the multilayer structure of valve plate sealing washer is five layers, does in proper order: rigid layer-flexible layer-rigid layer.

Still further, the rigid layer of the sealing ring is made of pure copper, and the flexible layer is made of flexible graphite.

Still further, the valve seat upstream face is at least partially inclined, and the valve plate upstream face outer edge is the inclined plane.

Still further, the contact surface of the valve seat flange and the valve body is at least provided with an annular waterproof seal; and an annular sealing gasket is arranged on the inner wall of the sealing ring.

Still further, the valve seat is provided with a screw hole matched with the valve seat bolt, and the screw hole is filled with waterproof materials.

Still further, the valve seat positioning piece is a valve seat flange, is fixed with the valve body through a valve seat bolt, and partially extends into the valve body.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

(1) the utility model discloses a valve has reduced the diameter of valve plate upstream face (the valve plate is direct by the one side that the medium erodees promptly), makes the valve sealing washer can expose by a large scale in the medium and bear bigger medium pressure when the off condition. Meanwhile, the seal ring with the multi-layer structure combined by hardness and softness is compressed by the flexible layer in the seal ring after the seal ring is subjected to medium pressure, so that the rigid layer in the seal ring is displaced along the medium flowing direction. The displacement of the rigid layer of the sealing ring is matched with the conical sealing surface, so that the automatic compensation of the abrasion gap of the sealing surface is realized.

(2) When the flexible layer of the valve plate sealing ring with the multilayer structure is compressed in the radial direction, the flexible layer inevitably expands in the direction perpendicular to the radial direction, and the expansion of the flexible layer can be used for further filling a hole generated by abrasion of the valve seat, so that the sealing effect of the valve is improved.

(3) The valve seat of the conventional hard sealing triple offset butterfly valve is usually fixed in the valve body, and the valve body needs to be disassembled usually to be replaced during replacement, which wastes time and labor. And the utility model discloses a set up detachable disk seat flange in one side of valve body to on passing through the bolt fastening in flange disk seat with the disk seat, need not to disassemble the valve body and can change when the disk seat is changed to needs, improved work efficiency.

(4) The seal structure of three eccentric butterfly valves of usual hard seal adopts the stainless steel usually, and the utility model discloses then utilize copper as the rigidity layer of sealing washer, it is better for the flexibility and the leakproofness of stainless steel, has both realized the good specificity of required metal durability and temperature adaptability in the hard seal, has improved the sealed effect on rigidity layer again. The flexible layer adopts flexible graphite instead of traditional rubber or polytetrafluoroethylene, so that the flexible layer not only has good elasticity, but also has better high-temperature resistance (the flexible graphite can bear the temperature of 450 ℃, and the polytetrafluoroethylene can generally bear the temperature of 250 ℃).

(5) The inner edge of the upstream face of the valve seat and the outer edge of the upstream face of the valve plate are both inclined planes, so that the pressure of a medium acts on the sealing ring when the valve is closed, the scouring effect of the medium on the upstream face of the valve seat and the valve plate is reduced, and the service life of accessories is prolonged.

(6) The waterproof seal that disk seat flange and valve body contact surface set up to and the sealed pad of annular that the sealing washer inner wall set up has all further increased the sealed effect of valve, avoids appearing the seepage.

(7) And the valve seat screw hole is filled with waterproof materials, so that the sealing effect of the valve is further improved.

(8) The valve seat flange is used as a valve seat positioning piece, and the valve seat flange is connected with the valve body through bolts, so that the positioning is accurate, and the disassembly and the assembly are convenient.

Drawings

Fig. 1 is a side view of a valve.

Fig. 2 is an enlarged view of a point a in fig. 1.

Fig. 3 is a sectional view of the valve plate seal ring.

Fig. 4 is a sectional view of the valve seat positioning member 1 in embodiment 1.

FIG. 5 is a cross-sectional view of the valve plate.

Fig. 6 is a cross-sectional view of the valve seat.

Wherein, 1-valve seat positioning piece; 11-flange bolts; 2-a valve body; 21-valve body bolt; 3-a valve stem; 4-a valve shaft; 5-a valve plate; 51-a gland; 52-gland bolts; 53-ribs; 6-valve seat; 61-valve seat bolt; 62-screw hole; 7-sealing ring; 71-a flexible layer; 72-a rigid layer; 73-annular sealing gasket; 8, waterproof sealing; 9-sealing surface.

Detailed Description

The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.

Example 1:

as shown in the figure, a three-eccentric butterfly valve with a self-adaptive sealing ring, with specification DN1750, is connected with a pipeline through a valve body bolt 21 on the butterfly valve. The butterfly valve of this embodiment includes disk seat 6, valve body 2, valve plate 5, valve shaft 4 and valve rod 3, and above-mentioned part all adopts the stainless steel to make, and wherein valve shaft 4 size is phi 240, and valve rod 3 length is 975 mm. The structure of the valve plate 5 is shown in fig. 5, the diameter of the upstream face (the face directly washed by the medium, namely the right side in fig. 5) of the valve plate 5 is 1500mm, the thickness of the valve plate 5 is 90mm, the upstream face of the valve plate 5 is provided with ribs 53, and the outer edge of the upstream face of the valve plate 5 is a 45-degree inclined plane. The external diameter of the sealing ring 7 is about 1750mm, the internal diameter is 1680mm, the section structure is shown in fig. 3, the section is trapezoidal, and the following components are sequentially arranged from left to right: the flexible printed circuit board comprises a rigid layer 72, a flexible layer 71, a rigid layer 72, a flexible layer 71 and a rigid layer 72, wherein the rigid layer 72 is an annular copper plate with the thickness of 10mm, and the flexible layer 71 is an annular rubber plate with the thickness of 10 mm; the sealing ring 7 is clamped and fixed on the back water surface of the valve plate 5 (the surface of the valve plate 5 which is not directly washed by a medium, namely the left side in the figure 5) through a gland 51 and a gland bolt 52, an annular sealing gasket 73 made of rubber is arranged between the inner ring of the sealing ring 7 and the valve plate 5, and the thickness of the annular sealing gasket 73 is 10 mm; the outer diameter of the gland 51 is 1740mm, and the specification of the gland bolt 52 is M16 with the length of 40. The valve seat positioning part 1 is a valve seat flange with an L-shaped section, the specific section structure is shown in figure 4, the outer diameter of the valve seat flange is phi 2412, the inner diameter of the valve seat flange is phi 1768mm, the overall length (namely the horizontal direction in figure 4) is 190mm, and the length of the part extending into the valve body 2 is 105 mm. The valve seat 6 is structurally shown in FIG. 6, the outer diameter is 1848mm, the inner diameter is about 1750mm, the thickness is 40mm, and the edge of the inner ring of the water facing surface of the valve seat 6 (namely, the edge at the lower left corner in FIG. 5) is a 45-degree inclined surface; the valve seat 6 is fixed with a flange of the valve seat 6 through a valve seat bolt 61, and the valve seat bolt 61 is M16 in specification and 35 in length; the screw hole 62 of the valve seat 6 is filled with a rubber material as a waterproof material. The outer ring surface of the sealing ring 7 is matched with the inner ring surface of the valve seat 6 to form a sealing surface 9, the sealing surface 9 is tapered (namely, the sealing surface is gradually reduced from left to right in figure 2), and the maximum diameter of the sealing surface 9 is about 1756 mm. In the position shown in fig. 2, two water-tight seals 8 of rubber material are provided on the contact surface of the flange of the valve seat 6 with the valve body 2.

The specific working principle is as follows: after the butterfly valve is assembled according to the drawing, the butterfly valve is fixed at the corresponding position on the pipeline through a valve body bolt 21 on the butterfly valve, and the butterfly valve is opened and closed according to specific use conditions. After the butterfly valve is used for a long time, a gap is generated by abrasion of a sealing surface 9 (i.e., a contact surface between the valve seat 6 and the seal ring 7) of the butterfly valve due to a friction effect of fine particles such as impurities in a medium. When the valve is in the closed state, because the utility model discloses a thoroughly expose sealing washer 7 in the structural feature of medium, make sealing washer 7 directly bear the pressure along the medium flow direction (from right to left in fig. 2 promptly) that the medium brought. When the pressure of the medium is applied to the outermost rigid layer 72 in the seal ring 7, pressure is applied to the flexible layer 71 in the seal ring 7, so that the flexible layer 71 is compressed, and the rigid layer 72 is displaced to the left in fig. 1. Because the sealing surface 9 is tapered, namely the diameter of the right side of the inner ring of the valve seat 6 in fig. 1 is larger than the diameter of the left side, in the process that the rigidity of the sealing ring 7 moves to the left, the gap generated by the abrasion of the sealing surface 9 is naturally compensated, so that the automatic compensation function of the gap of the sealing surface 9 is realized, and the service life of the valve sealing structure (namely the valve seat 6 and the sealing ring 7) is prolonged.

Example 2;

this embodiment has the same structure as embodiment 1 except that the flexible layer 71 of the seal ring 7 is replaced with a rubber material for flexible graphite, and the materials of the two waterproof seals 8 between the flange of the valve seat 6 and the seal ring 7 of the valve body 2, the ring-shaped seal 73, and the waterproof material filled in the screw hole 62 of the flange of the valve seat 6 are replaced with flexible graphite. Because the flexible graphite can normally work in the working environment of 450 ℃, the working temperature limit of the valve is greatly improved by adopting the flexible graphite to replace rubber.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims

1. The utility model provides a three eccentric butterfly valves with self-adaptation sealing washer, includes disk seat (6), valve body (2), valve plate (5), valve shaft (4) and valve rod (3), its characterized in that: a sealing ring (7) matched with the valve seat (6) is arranged on the valve plate (5); the sealing ring (7) is clamped and fixed with a gland (51) arranged on the valve plate (5) through the valve plate (5); the gland (51) is fixed with the valve plate (5) through a gland bolt (52); the outer diameter of the valve plate (5) is larger than the inner diameter of the sealing ring (7) and is smaller than one half of the sum of the inner diameter and the outer diameter of the sealing ring (7); the inner wall of the valve seat (6) is matched with the outer wall of the sealing ring (7) to form a sealing surface (9), and the sealing surface (9) is a conical surface; the sealing ring (7) is of a multilayer structure in the radial direction and is composed of rigid layers (72) and flexible layers (71) in an alternating mode.

2. A triple offset butterfly valve with an adaptive seal according to claim 1, characterized in that: the valve body (2) is provided with a valve seat positioning piece (1); the valve seat positioning piece (1) is at least partially positioned in the valve body (2); the valve seat (6) is positioned in the valve body (2) and is fixed on the valve seat positioning piece (1) through a valve seat bolt (61).

3. A triple offset butterfly valve with an adaptive seal according to claim 1, characterized in that: the multilayer structure of valve plate (5) sealing washer (7) is five layers, does in proper order: rigid layer (72) -flexible layer (71) -rigid layer (72).

4. A triple offset butterfly valve with an adaptive seal according to claim 1, characterized in that: the rigid layer (72) of the sealing ring (7) is made of pure copper, and the flexible layer (71) is made of flexible graphite.

5. A triple offset butterfly valve with an adaptive sealing ring (7) according to claim 1, characterized in that: at least part of the upstream surface of the valve seat (6) is an inclined surface, the outer edge of the upstream surface of the valve plate (5) is an inclined surface, and a rib (53) is arranged on the upstream surface of the valve plate (5).

6. A triple offset butterfly valve with an adaptive seal according to claim 1, characterized in that: the contact surface of the flange of the valve seat (6) and the valve body (2) is at least provided with an annular waterproof seal (8); and an annular sealing gasket (73) is arranged on the inner wall of the sealing ring (7).

7. A triple offset butterfly valve with an adaptive seal according to claim 1, characterized in that: and the valve seat (6) is provided with a screw hole (62) matched with the valve seat bolt (61), and the screw hole (62) is filled with waterproof materials.

8. A triple offset butterfly valve with an adaptive seal according to claim 2, characterized in that: the valve seat positioning piece (1) is a valve seat flange, the section of the valve seat flange is L-shaped, the valve seat flange is fixed with the valve body (2) through a valve seat bolt (61), and the valve seat positioning piece partially extends into the valve body (2).