CN-224214711-U - Vacuum breaking valve

CN224214711UCN 224214711 UCN224214711 UCN 224214711UCN-224214711-U

Abstract

Aiming at the problem of fracture and damage caused by larger stress received by a valve rod of a vacuum breaking valve in the prior art when the valve rod rotates, the utility model provides a vacuum breaking valve which comprises a valve body with an annular radial section, a disc plate positioned in a flow passage of the valve body and a valve rod used for driving the disc plate to rotate under the driving of an actuating mechanism so as to open or close the flow passage, the valve body is provided with an upper pore canal and a lower pore canal which are vertically opposite, the lower end of the valve rod sequentially passes through the upper pore canal and the disc plate to the lower pore canal, and the valve rod and the disc plate are fixed through connecting pins passing through the upper pore canal and the disc plate, wherein the central line of the connecting pin deviates from the central line of the valve rod, so that the valve rod is stressed less when rotating, and is not easy to break, the service life of the vacuum breaking valve is prolonged, and the maintenance cost is reduced.

Inventors

LI JIFENG
JIANG SHIJIN
Zhou Haojian
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: 20260508
Application Date: 20250512
Priority Date: 20250306

Claims (10)

1. The utility model provides a vacuum break valve, includes that radial cross-section is annular valve body, is located the dish board in the runner of valve body and be used for driving under actuating mechanism's drive the dish board rotates in order to open or close the valve rod of runner, 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 down the pore, valve rod and dish board are fixed through the connecting pin that passes both, its characterized in that, the central line of connecting pin skew the central line of valve rod.
2. A vacuum break valve according to claim 1 wherein the connecting pin passes vertically through the disc and valve stem.
3. A vacuum break valve according to claim 1 wherein the centre line of the connecting pin is tangential to the valve stem.
4. A vacuum break valve according to any of claims 1-3, characterized in that the back of the disc plate forms a tube body penetrated by the valve stem in the up-down direction, the tube body and the valve stem being fixed by the connecting pin penetrating both, the tube body passing through the center of the back of the disc plate.
5. A vacuum break valve according to claim 1 characterized in that the valve body has a seat body, the upper duct is formed on the seat body, the seat body has a supporting frame for fixing the actuator, and the supporting frame has a trapezoid shape with a narrow upper part and a wide lower part.
6. A vacuum break valve according to claim 5 wherein the support is formed by bending a steel plate.
7. The vacuum break valve according to claim 1, wherein the upper duct is internally provided with a step so that the upper duct is divided into an upper section and a lower section, the upper section is wider than the lower section, a packing is arranged between the upper section and a valve rod, the packing is pressed on the step by a packing cover, the packing cover is penetrated by the valve rod and is fixed with a valve body through a fixing bolt, the packing comprises an upper packing structure and a lower packing structure, each of the upper packing structure and the lower packing structure comprises a head packing element, a plurality of middle packing elements and a tail packing element, the rear end surfaces of the head packing element, the middle packing element and the tail packing element are all annular, the front end surfaces of the head packing element form a circle of protruding parts with triangular axial cross sections, the front end surfaces of the middle packing element form a circle of protruding parts with triangular axial cross sections, the rear end surfaces of the tail packing element form a circle of protruding parts with triangular axial cross sections, the front end surfaces of the tail packing element are plane, the head packing element, the middle packing element, the tail packing element and the tail packing element are sequentially arranged from the upper end surfaces, the lower end surfaces of the head packing element and the tail packing element are sequentially arranged from the upper end surfaces to the lower end surfaces of the packing element, and the front packing element are sequentially arranged from the front end surfaces to the protruding elements to the upper end surface and the upper end surface of the packing element.
8. A vacuum break valve according to claim 7 characterized in that a resilient washer is provided between the packing cover and the nut of the fixing bolt.
9. A vacuum break valve according to claim 1, further comprising a valve seat for forming a sealing surface with the disc plate and an insert for pressing against the valve seat, the radial cross section of the insert being annular and being fixed in the front flow passage opening of the valve body, the outer diameter of the insert being adapted to the inner diameter of the front flow passage opening, a sealing ring being provided between the insert and the inner wall of the flow passage of the valve body.
10. A vacuum break valve according to claim 1 wherein the lower port is a blind hole.

Description

Vacuum breaking valve Technical Field The utility model belongs to the technical field of valves, and particularly relates to a vacuum breaking valve. Background The main function of the vacuum break valve is to automatically suck air to protect the equipment and system when the pipeline or container generates negative pressure or vacuum is raised gradually due to the operation or stop of the system. If the circulating cooling water system of the nuclear power station is in power failure or is shut down due to failure, the circulating cooling water system needs to supply air to the condenser in time through the flow channel of the vacuum breaking valve so as to break the vacuum at the outlet of the seawater circulating water pump and prevent water flow from flowing backwards, thereby protecting the safe operation of the host, but under normal conditions, the air supply channel (the flow channel of the vacuum breaking valve) leading to the condenser needs to be closed. In the prior art, the vacuum breaking valve comprises a valve body, a disc plate positioned in a flow channel of the valve body and a valve rod used for driving the disc plate to rotate under the driving of an actuating mechanism so as to open or close the flow channel, wherein the valve rod and the disc plate are fixed through a connecting pin passing through the valve rod and the valve rod, and the connecting pin passes through the center line of the valve rod. Disclosure of utility model In view of the above, a vacuum break valve is provided. The technical scheme adopted by the utility model is as follows: The utility model provides a vacuum break valve, includes that radial cross-section is annular valve body, is located the dish board in the runner of valve body and be used for driving under actuating mechanism's drive the dish board rotates in order to open or close the valve rod of runner, 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 down the pore, valve rod and dish board are fixed through the connecting pin that passes both, its characterized in that, the central line of connecting pin skew the central line of valve rod. The center line of the connecting pin deviates from the center line of the valve rod, so that the valve rod is less in stress when rotating and is not easy to break, the service life of the vacuum breaking valve is prolonged, and the maintenance cost is reduced. 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 vacuum break valve according to an embodiment of the present 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 utility model of the present patent and are not intended to limit the embodiments thereof. It will be apparent to those skilled in the art that various changes and modifications can be made in the embodiment described, and that all the obvious changes or modifications which come within the spirit and scope of the utility model are deemed to be within the scope of the utility model. As shown in fig. 1, an embodiment of the present application provides a vacuum break valve comprising a valve body 110, a disk 120, a valve stem 130, a valve seat 140, and an insert 150. The radial section of the valve body 110 is annular, the inside is a flow channel 111, and both the front and the back have flanges, wherein the front is one side of the connection system (right side in fig. 1), the back is one side of the connection air inlet pipe (left side in fig. 1), and fig. 1 shows the air inlet flow direction when the vacuum needs to be broken. As shown in fig. 3, the valve body 110 has an upper hole 112 and a lower hole 113 opposite to each other, the upper hole 112 is formed on the seat 114 and is penetrated by the valve rod 130, and the lower hole 113 is a blind hole, so that compared with the through hole in the prior art, leakage points can be reduced. As shown in fig. 3, the upper duct 112 has a step therein, so that the upper duct 112 is divided into an upper section 1