CN-224229273-U - Leak-proof butterfly valve

CN224229273UCN 224229273 UCN224229273 UCN 224229273UCN-224229273-U

Abstract

Aiming at the problems of poor sealing effect, easy leakage, higher cost and inconvenient installation between a valve rod and a valve body of a butterfly valve in the prior art, the utility model provides a leakage-proof butterfly valve, wherein a filler between the valve rod and the valve body consists of a head filler piece, a plurality of middle filler pieces and a tail filler piece, adjacent filler pieces are spliced through a bulge part and a groove, and the angle of the bulge part is larger than that of the groove into which the bulge part is inserted, so that the middle filler piece and the tail filler piece can be propped up under the atmospheric pressure, the sealing effect is good under the condition that the butterfly valve is connected with a vacuum system, the leakage-proof capacity is strong, and compared with the traditional water seal structure, the leakage-proof butterfly valve is more economical and convenient to install.

Inventors

LI JIFENG
Zhou Haojian
JIANG SHIJIN
YUAN YE
LU WEIDONG
SUN ZONGXU
SHI JIANXIN

Assignees

中广核工程有限公司
悠尼酷(上海)流体控制有限公司

Dates

Publication Date: 20260512
Application Date: 20250512
Priority Date: 20250306

Claims (10)

1. A leak-proof butterfly valve comprises a valve body with an annular radial section, a disk plate positioned in a flow passage of the valve body, a valve rod used for driving the disk plate to rotate under the drive of an actuating mechanism so as to open or close the flow passage, a valve seat used for forming a sealing surface with the disk plate, and an insert used for pressing the valve seat, the valve body is provided with an upper pore canal and a lower pore canal which are opposite up and down, the lower end of the valve rod sequentially passes through the upper pore canal and the disc plate to the lower pore canal, a sealing medium is arranged between the upper pore canal and the valve rod, the valve rod and the disc plate are fixed through a connecting pin passing through the valve rod and the disc plate, it is characterized in that the sealing medium is a filler, the filler comprises an upper filler structure and a lower filler structure, the upper packing structure and the lower packing structure comprise a head packing element, a plurality of middle packing elements and a tail packing element, the head packing element, the middle packing element and the tail packing element are all annular, the rear end face of the head packing element is a plane, the front end face forms a circle of protruding parts with triangular axial sections, the rear end face of the middle packing element forms a circle of grooves with triangular axial sections, the front end face forms a circle of protruding parts with triangular axial sections, the rear end face of the tail packing element forms a circle of grooves with triangular axial sections, the front end face is a plane, the head packing element, the plurality of middle packing elements and the tail packing element of the upper packing structure are sequentially arranged from top to bottom, the front end face of each packing element faces downwards, the head packing element, the plurality of middle packing elements and the tail packing element of the lower packing structure are sequentially arranged from bottom to top, the front end face of each packing element faces upwards, wherein, adjacent packing piece passes through protruding portion and recess grafting, just the angle of protruding portion is greater than the angle of corresponding recess.
2. A leak-proof butterfly valve as recited in claim 1, wherein the centerline of the connecting pin is offset from the centerline of the valve stem.
3. A leak-proof butterfly valve according to claim 2, wherein the connecting pin passes perpendicularly through the plate and the valve stem.
4. A leak-proof butterfly valve as recited in claim 2, wherein the centerline of the connecting pin is tangential to the valve stem.
5. A leak-proof butterfly valve according to any one of claims 2 to 4, wherein the back surface of the plate is formed with a tube penetrated by the valve stem in the up-down direction, the tube and the valve stem being fixed by the connecting pin penetrating both, the tube passing through the center of the back surface of the plate.
6. The leakage-proof butterfly valve according to claim 1, wherein the valve body is provided with a seat body, the upper pore canal is formed on the seat body, the seat body is provided with a supporting frame for fixing the actuating mechanism, and the supporting frame is in a trapezoid shape with a narrow upper part and a wide lower part.
7. A leak-proof butterfly valve as recited in claim 6, wherein the support bracket is formed from a sheet of steel.
8. The leakage preventing butterfly valve according to claim 1, wherein the upper duct has a step therein to divide the upper duct into an upper section and a lower section, the upper section being wider than the lower section, the packing being provided between the upper section and the valve stem, the packing being pressed against the step by a packing cover which is passed through by the valve stem and fixed to the valve body by a fixing bolt,
9. The leak-proof butterfly valve of claim 8, wherein a resilient spacer is disposed between the packing cover and the nut of the fixing bolt.
10. The leakage-proof butterfly valve of claim 1, wherein a seal ring is disposed between the insert and an inner wall of the flow passage of the valve body, and the lower orifice is a blind hole.

Description

Leak-proof butterfly valve Technical Field The utility model belongs to the technical field of valves, and particularly relates to a leakage-proof butterfly valve. Background Butterfly valves are a commonly used type of valve, mainly for opening and closing or regulating the flow of a medium in a pipeline. In the prior art, the butterfly valve comprises a valve body with an annular radial section, a disc plate positioned in a flow passage of the valve body, a valve rod used for driving the disc plate to rotate to open or close the flow passage under the drive of an actuating mechanism, a valve seat used for forming a sealing surface with the disc plate and an insert for pressing the valve seat, wherein in order to prevent the butterfly valve from leaking, a sealing medium such as a filler or a water seal is usually arranged between the valve rod and the valve body, and the filler is connected with a vacuum system (such as a condenser connected with a circulating cooling water system of a nuclear power station) by the butterfly valve. Disclosure of utility model In view of the above, the present invention provides a leak-proof butterfly valve. The technical scheme adopted by the utility model is as follows: The utility model provides a leak protection butterfly valve, includes radial cross-section annular valve body, is located the dish board in the runner of valve body, be used for driving under actuating mechanism's drive the dish board rotates in order to open or close the valve rod of runner, be used for with the disk forms the disk seat of sealed face and push down the inserts of disk seat, have upper and lower relative pore and lower pore on the valve body, the lower extreme of valve rod passes in proper order upper pore and dish board extremely the lower pore, be equipped with sealing medium between upper pore and the valve rod, valve rod and dish board are fixed through the connecting pin that passes both, its characterized in that, sealing medium is the filler, and this filler includes upper filler structure and lower filler structure, upper filler structure and lower filler structure all include first filler piece, a plurality of well filler piece and tail filler piece, first filler piece and well filler piece all are the annular, the rear end face of first filler piece is the plane, and the front end face forms the bulge of a round triangle-shaped that the axial is the round, the rear end face of well filler piece forms a recess axial direction, the front end face of well filler piece forms a recess axial recess, the front end face of a round-down, the end face is the triangle-shaped that is the plane is arranged by the upper end face of the triangle-shaped piece and the end face of the lower end face of the back end face of the well filler piece, the front end face of the triangle-shaped, the front end face is the triangle-shaped piece is arranged to the plane, the front end face is arranged by the plane of the front end face of the triangle-shaped, the front end piece and the back end face is arranged by the plane, the front end face is the plane, the plane is the plane. The packing between the valve rod and the valve body consists of the head packing element, the plurality of middle packing elements and the tail packing element, and the adjacent packing elements are spliced through the convex parts and the grooves, and the angle of the convex parts is larger than that of the grooves into which the convex parts are inserted, so that the middle packing elements and the tail packing elements can be spread under the atmospheric pressure, the sealing effect is good under the condition that the butterfly valve is connected with a vacuum system, the leakage preventing capability is strong, and compared with the traditional water sealing structure, the packing is more economical and the installation is convenient. Drawings The utility model is described in detail below with reference to the attached drawings and detailed description: FIG. 1 is an axial cross-sectional view of a leak-proof butterfly valve provided by an embodiment of the utility model; FIG. 2 is a right side view of the schematic diagram of FIG. 1; FIG. 3 is a radial cross-sectional view of a valve body according to an embodiment of the present utility model; FIG. 4 is an enlarged view of a portion of FIG. 1 at A; FIG. 5 is a schematic perspective view of a disk plate according to an embodiment of the present utility model; FIG. 6 is a transverse cross-sectional view of the valve stem and the body of the disk of FIG. 1 secured by a connecting pin; Fig. 7 is a partial enlarged view of fig. 1 at B. Detailed Description Embodiments of the present utility model will be described below with reference to the drawings. The embodiments described in the present specification are not intended to be exhaustive or to represent the only embodiments of the present utility model. The following examples are presented for clarity of illustration of the