Double eccentric butterfly valve

Abstract

The utility model discloses a double eccentric butterfly valve, it includes by two half valve body and inserts together valve body, is equipped with the through -hole of being used as fluid passage in the valve body, the valve plate of eccentricity setting and can seal the through -hole of valve body is installed in the valve body, the left half valve body of valve body is equipped with the valve seat of cooperation sealing through -hole with valve plate, the right half valve body bottom of valve body is sealedly connected with the support axle, the right half valve body top of valve body is equipped with the connecting hole and is rotatably connected with drive shaft in connecting hole, and the outer end of drive shaft is equipped with drive handle subassembly, the top power connection of valve plate is on drive shaft, and the bottom is connected on support axle, and drive shaft and the connecting hole between right half valve body are equipped with fireproof sealing subassembly. The utility model has the advantages of high assembly efficiency and can realize the function of fire prevention.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically a double eccentric butterfly valve. Background Technology

[0002] Most butterfly valves in the current technology adopt a double eccentric structure. The double eccentric structure means that the valve stem axis is off from both the center of the butterfly plate and the center of the valve body. After the valve stem drives the butterfly plate to rotate and open, the butterfly plate can quickly disengage from the valve seat, which greatly eliminates unnecessary excessive compression and scraping between the butterfly plate and the valve seat, reduces the torque when the butterfly valve is opened, reduces wear, and improves the valve seat life.

[0003] The butterfly valves described above lack fire resistance. When used in oil pipelines, fire resistance is required, but none of the existing butterfly valve designs possess this capability. Secondly, the valve body is typically a one-piece structure, which is inconvenient for assembly and maintenance. The aforementioned eccentric design also makes butterfly valve assembly time-consuming and labor-intensive, resulting in low efficiency. Thirdly, the seal between the valve plate and seat uses a surface contact structure, which can easily lead to poor sealing stability during long-term wear. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a double eccentric butterfly valve that can quickly and accurately connect the special-shaped nut and ensure its tightening accuracy, thereby realizing automated operation and improving efficiency.

[0005] To solve the above-mentioned technical problems, the provided double eccentric butterfly valve includes a valve body consisting of two valve bodies inserted together. The valve body has a through hole for fluid passage. The valve body is equipped with an eccentrically positioned valve plate that can seal the through hole of the valve body. The left half of the valve body is equipped with a valve seat that cooperates with the valve plate to seal the through hole. Its structural features are: the bottom of the right half of the valve body is sealed and connected to a support shaft; the top of the right half of the valve body is provided with a connection hole and a drive shaft is rotatably connected in the connection hole; the extended end of the drive shaft is equipped with a drive handle assembly; the top of the valve plate is poweredly connected to the drive shaft and the bottom is connected to the support shaft; a fireproof sealing assembly is installed between the drive shaft and the connection hole of the right half of the valve body.

[0006] The fireproof sealing assembly includes a packing gasket and a packing sleeve fitted on the drive shaft and with their outer walls attached to the wall of the connecting hole. The packing gasket and the packing sleeve are spaced apart vertically and filled with fireproof material. A sealing ring located above the packing sleeve is also installed between the drive shaft and the connecting hole.

[0007] The drive handle assembly includes a ratchet disc connected to the top of the valve body, the ratchet disc having ratchet teeth, a handle connected to the drive shaft, and a meshing shank that engages with the ratchet teeth being elastically connected to the lower part of the handle.

[0008] The left half of the valve body is provided with a valve seat mounting ring hole. The valve seat is installed in the valve seat mounting ring hole. The cross-section of the valve seat is polygonal, and one vertex of the polygon extends out of the valve seat mounting ring hole. The sealing outer ring surface of the valve plate is conical and can abut against the vertex of the valve seat to achieve a tight seal.

[0009] With the above structure, this utility model achieves high assembly efficiency by setting two valve bodies, each fitted with a valve plate and a valve seat. The two valve bodies are connected together by a plug-in screw structure, which greatly improves the assembly efficiency of the butterfly valve. By setting a fireproof sealing component, it can prevent flames from shooting out through the valve shaft (drive shaft, where flames move upward) in the event of a fire, thus meeting the requirements of butterfly valves for oil pipelines. Through the structural arrangement of the sealing outer ring surface of the valve plate and the valve seat, a point contact (line seal) is achieved first, followed by gradual pressure to form a surface seal, which improves the sealing effect between the valve plate and the valve seat.

[0010] In summary, the above solution has the following advantages compared with the prior art: the present invention has the advantages of high assembly efficiency and fireproof function. Attached Figure Description

[0011] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 yes Figure 1 A schematic diagram of the left half of the valve body in the embodiment; Figure 3 yes Figure 1 A schematic diagram of the right half of the valve body in the embodiment. Detailed Implementation

[0012] Referring to the accompanying drawings, an embodiment of a double eccentric butterfly valve is shown, comprising a valve body 1 consisting of two valve body halves inserted together. Specifically, it is divided into a left valve body and a right valve body. The left valve body is inserted into the right valve body and then screwed on (the left valve body has a insertion platform, and the right valve body has an insertion hole), achieving a screw-on connection between the left and right valve bodies. The valve body 1 has a through hole 2 for fluid passage. The valve body 1 contains an eccentrically positioned valve plate 3 that seals the through hole. The left valve body 1 is equipped with a valve plate. 3. The valve plate 3 is installed with a valve seat 4 that seals the through hole. In this embodiment, the valve plate 3 is installed using the following structure: a support shaft 5 is sealed to the bottom of the right half of the valve body 1; a connecting hole is provided at the top of the right half of the valve body 1, and a drive shaft 6 is rotatably connected within the connecting hole; the top of the valve plate 3 is poweredly connected to the drive shaft, and the bottom is connected to the support shaft. In this embodiment, the support shaft 5 is screwed onto the valve body 1, and a sealing ring is used to seal the nut end with the valve body; the lower end of the valve plate is fitted onto the support shaft 5 via a bushing. The valve seat 4 is installed using the following structure: a valve seat mounting ring hole is provided on the left half of the valve body; the valve seat 4 is installed within the valve seat mounting ring hole; the cross-section of the valve seat 4 is polygonal, and one vertex of the polygon extends beyond the valve seat mounting ring hole; the sealing outer annular surface of the valve plate 3 is conical and can abut against the vertex of the valve seat 4 to achieve a tight seal. The above structure greatly improves the sealing effect when the valve plate and valve seat are in contact.

[0013] Referring to the accompanying drawings, a fireproof sealing assembly is installed between the drive shaft 6 and the connecting hole of the right half of the valve body. The fireproof sealing assembly includes a packing ring 7 and a packing sleeve 8, which are fitted onto the drive shaft and have their outer walls attached to the hole wall of the connecting hole. In this embodiment, the packing ring 7 adopts a fitted structure with a trumpet-shaped opening. When it is deformed, its inner and outer surfaces are more tightly attached to the shaft surface of the drive shaft and the hole wall of the connecting hole, respectively. The packing ring 7 and the packing sleeve 8 are spaced apart vertically and filled with fireproof material between them. The fireproof material is made of graphite. The packing sleeve 8 is connected by a screw connection, that is, the inner hole of the packing sleeve 8 and the shaft surface of the drive shaft 6 are slightly interference-fitted. The packing sleeve 8 has an external thread, and the hole wall of the connecting hole is provided with an internal thread. That is, the packing sleeve 8 is screwed into the connecting hole. Therefore, by screwing the packing sleeve 8, the fireproof material can be made more compact and the packing ring 7 can be deformed. A sealing ring 9 is also installed between the drive shaft 6 and the connecting hole, located above the packing sleeve 8. The above structure can better achieve the fire protection function of this part and meet the installation requirements of oil pipelines.

[0014] Referring to the attached drawings, a drive handle assembly is mounted on the extended end of the drive shaft 6. The drive handle assembly includes a ratchet disc 12 connected to the top of the valve body 1, with ratchet teeth on the disc. A handle 10 is connected to the drive shaft 6. A meshing shank 11 that engages with the ratchet teeth is elastically connected to the lower part of the handle 10. Specifically, the middle part of the meshing shank 11 is hinged to the handle via a hinge pin. A spring is installed between the rear end of the meshing shank 11 and the handle 10. The front end of the meshing shank 11 has a protrusion that can be inserted into the ratchet teeth. The spring force drives the protrusion of the meshing shank into the ratchet teeth. When the spring is compressed, the protrusion disengages from the ratchet teeth. This structure enables the handle to drive the drive shaft 6 to rotate and also lock the drive shaft.

[0015] The above describes the specific structural form of this utility model. This utility model is not limited to the above embodiments. For those skilled in the art, equivalent changes to the specific structure and component substitutions based on this utility model are all within the protection scope of this utility model.

Claims

1. A double eccentric butterfly valve, comprising a valve body (1) consisting of two valve body halves inserted together, a through hole for fluid passage provided in the valve body, a valve plate (3) eccentrically positioned and capable of sealing the through hole of the valve body (1) being installed inside the valve body (1), and a valve seat (4) cooperating with the valve plate (3) to seal the through hole on the left half of the valve body (1), characterized in that: The bottom of the right half of the valve body (1) is sealed with a support shaft (5). The top of the right half of the valve body (1) is provided with a connection hole and a drive shaft (6) is rotatably connected in the connection hole. The extended end of the drive shaft (6) is equipped with a drive handle assembly. The top of the valve plate (3) is poweredly connected to the drive shaft and the bottom is connected to the support shaft. A fireproof sealing assembly is installed between the drive shaft (6) and the connection hole of the right half of the valve body.

2. The double eccentric butterfly valve according to claim 1, characterized in that: The fireproof sealing assembly includes a packing gasket (7) and a packing sleeve (8) fitted on the drive shaft and with their outer walls attached to the wall of the connecting hole. The packing gasket (7) and the packing sleeve (8) are spaced apart vertically and filled with fireproof material. A sealing ring (9) located above the packing sleeve (8) is also installed between the drive shaft (6) and the connecting hole.

3. The double eccentric butterfly valve according to claim 1, characterized in that: The drive handle assembly includes a ratchet plate connected to the top of the valve body (1), the ratchet plate is provided with ratchet teeth, a handle (10) is connected to the drive shaft (6), and a meshing shank (11) that can cooperate with the ratchet teeth is elastically connected to the lower part of the handle (10).

4. The double eccentric butterfly valve according to any one of claims 1-3, characterized in that: The left half of the valve body is provided with a valve seat mounting ring hole. The valve seat (4) is installed in the valve seat mounting ring hole. The cross section of the valve seat (4) is polygonal and one vertex of the polygon extends out of the valve seat mounting ring hole. The sealing outer ring surface of the valve plate (3) is conical and can abut against the vertex of the valve seat (4) to achieve a tight seal.

Images