Nuclear power station passive ventilation system isolation valve

Abstract

The utility model discloses an isolating valve of a passive ventilation system of a nuclear power station, and belongs to the field of isolating valves. Comprising a valve body of a tubular structure; the valve plate is arranged in the valve body and used for opening and closing the valve body; the sealing piece is arranged at one end of the valve body and used for sealing the valve body and the valve plate; the valve rod is used for driving movement; the three-section type eccentric connecting rod structure is used for enabling the valve rod to drive the valve plate to translate along the center line of the valve body when the valve plate is opened and to turn to be parallel to the center line of the valve body after a certain distance is reached. The nuclear power station passive ventilation system isolation valve has the beneficial effect that the nuclear power station passive ventilation system isolation valve is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of isolation valves, in particular to a passive ventilation system isolation valve for nuclear power plants. BACKGROUND

[0002] The isolation valves for nuclear power plants are generally divided into 0 level, I level and II level according to the leakage level. The circular isolation valve mechanism form is optimized under the premise of meeting zero leakage. The original three-bar butterfly valve and double eccentric butterfly valve are designed and changed accordingly to meet the product service life, safety reliability and manufacturing efficiency. The existing butterfly valve is opened and closed by the overturning of the butterfly plate, which causes the stress of the sealing structure in different areas to be inconsistent when opening and closing, which is easy to cause leakage.

[0003] Therefore, a safe and reliable passive ventilation system isolation valve for nuclear power plants is needed. CONTENT OF THE UTILITY MODEL

[0004] The content part of the present application is used to introduce the concept in a simple form, which will be described in detail in the specific embodiment part. The content part of the present application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0005] In order to solve the technical problems mentioned in the background part, some embodiments of the present application provide a passive ventilation system isolation valve for nuclear power plants, comprising: a valve body, which is a pipe type structure; a valve plate, which is arranged in the valve body and is used for opening and closing the valve body; a sealing element, which is arranged at one end of the valve body and is used for sealing between the valve body and the valve plate; a valve stem, which is used to drive movement; a three-section eccentric connecting rod structure, which is used to make the valve stem drive the valve plate to move along the center line of the valve body first when opening, and then overturn to a state parallel to the center line of the valve body after a certain distance. The three-section eccentric connecting rod structure comprises: a connecting rod seat fixed on the inner wall of the valve body, the valve stem passes through the connecting rod seat; a first rod fixed on the valve stem; a second rod fixed on the valve plate, a hinge shaft is rotatably connected to the second rod, and the first rod is hinged to the second rod through the hinge shaft; and a third rod, one end of which is hinged to the connecting rod seat, and the other end is hinged to the second connecting rod.

[0006] Through the three-section eccentric connecting rod structure, the valve plate is first moved along the center line of the valve body when opening, and then overturned to open.

[0007] Further, the first end of the second rod is fixed to the valve plate, the second end is hinged to the third rod, and the hinge shaft is located between the first end and the second end.

[0008] Further, the sealing member comprises a sealing ring holder arranged inside the valve body, and a projection on the valve plate has a part coinciding with the edge area of the valve plate; and a sealing ring arranged on the sealing ring holder close to the valve plate, and having a part abutting with the edge area of the valve plate.

[0009] Further, the valve rod is arranged to pass through the valve body at both ends, and a rotating seal is arranged at the passing position.

[0010] Further, a cylindrical part is arranged on the connecting rod seat, and the valve rod passes through the cylindrical part and is arranged with a bearing between the valve rod and the cylindrical part.

[0011] Further, a driving part is fixedly connected to the outside of the valve body, and an output end of the driving part is fixedly connected with the valve rod.

[0012] Further, a sleeve is fixedly connected to the valve rod, and one end of the first rod is fixed to the sleeve.

[0013] The nuclear power plant passive ventilation system isolation valve has the advantages that: the valve opening and closing are realized through the three-rod connecting rod mechanism, the sealing performance is good, the action is stable and reliable, the valve is flexible, non-blocking and small in abrasion, the sealing member is convenient to replace, and the service life is long. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings constituting a part of this application are used to provide further understanding of this application, so that other features, objects and advantages of this application become more apparent. The illustrative embodiment drawings of this application and the description thereof are used to explain this application, and do not constitute an improper limitation on this application.

[0015] In addition, throughout the drawings, the same or similar reference signs represent the same or similar elements. It should be understood that the drawings are schematic, and the elements and elements are not necessarily drawn according to the scale.

[0016] In the drawings:

[0017] Figure 1 is a whole schematic view according to an embodiment of the application;

[0018] Figure 2 is Figure 1 the front view schematic view of the valve body in the embodiment;

[0019] Figure 3 is Figure 1 the side sectional view schematic view of the valve body of the embodiment.

[0020] Reference signs:

[0021] 100, valve body; 101, valve plate; 102, seal; 103, valve stem; 104, link seat; 105, first rod; 106, second rod; 107, third rod; 108, seal ring holder; 109, seal ring; 110, driving component; 111, cylindrical portion; 112, sleeve; 113, hinged shaft. DETAILED DESCRIPTION

[0022] Embodiments of the present disclosure will be described in more detail with reference to the drawings. Although certain embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be interpreted as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly and completely understood. It should be understood that the drawings of the present disclosure are only for illustrative purposes and should not be construed as limiting the scope of protection of the present disclosure.

[0023] In addition, it should be further noted that only the parts related to the present application are shown in the drawings for ease of description. The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that the concepts of "first", "second", etc. mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0025] It should be noted that the adjectives "one", "multiple" mentioned in the present disclosure are illustrative and not limiting, and those skilled in the art should understand that unless otherwise explicitly stated in the context, it should be understood as "one or more".

[0026] The present disclosure will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0027] Reference Figures 1-3 A passive ventilation system isolation valve for a nuclear power plant includes a valve body 100, a valve plate 101, a seal 102, a valve stem 103, a link seat 104, a first rod 105, a second rod 106, and a third rod 107. The valve body 100 is a pipe-shaped structure, and the valve plate 101 is arranged in the valve body 100 and used to open and close the valve body 100. The inner cavity of the valve body 100 is blocked by the valve plate 101 to control the opening and closing of the valve and the flow.

[0028] The sealing member 102 is arranged at one end of the valve body 100, and is used to seal the valve body 100 and the valve plate 101. The sealing member 102 comprises a sealing ring holder 108 and a sealing ring 109. The sealing ring holder 108 is fixedly arranged on the inner side of the valve body 100, and is located on the inner wall of the valve body 100. The projection of the valve plate 101 on the sealing ring holder 108 has a coinciding part with the edge area of the valve plate 101. When the valve plate 101 is closed to the valve body 100, the valve plate 101 covers the sealing ring holder 108, and the edge area is in close contact with the sealing ring holder 108 to achieve sealing. The sealing ring 109 is arranged on the side of the sealing ring holder 108 close to the valve plate 101, and has a close contact part with the edge area of the valve plate 101. When the valve plate 101 is closed to the valve body 100, the edge area of the valve plate 101 is in close contact with the sealing ring 109 to achieve sealing. The sealing form of the valve plate 101 is a pressing type sealing, which can avoid leakage.

[0029] In one embodiment, the sealing ring holder 108 has a tapered groove with a gradually decreasing cross section away from the wiping plate side. The sealing ring 109 is embedded in the tapered groove. When the valve plate 101 is pressed in close contact with the sealing ring 109, the sealing ring 109 is embedded on the side with a smaller cross section. When the sealing ring 109 needs to be replaced, it only needs to be taken out without disassembling the installed valve.

[0030] The valve stem 103 is arranged to pass through the valve body 100 at both ends, and rotating seals are arranged at the positions where the valve stem 103 passes through the valve body 100. The outer side of the valve body 100 is fixedly connected with a driving component 110, which can be an electric motor. The output end of the electric motor is fixedly connected with the valve stem 103. The valve stem 103 is located on the side of the valve plate 101 away from the sealing ring holder 108.

[0031] The connecting rod seat 104 is fixed on the inner wall of the valve body 100. The valve stem 103 passes through the connecting rod seat 104. The connecting rod seat 104 is provided with a cylindrical portion 111. The valve stem 103 passes through the cylindrical portion 111 and is provided with a bearing between the valve stem 103 and the cylindrical portion. The valve stem 103 is fixedly connected with a sleeve 112. One end of each of the two first rods 105 is fixed on the sleeve 112. The two second rods 106 are fixed on the valve plate 101. The two second rods 106 are rotatably connected with a hinge shaft 113. The first rods 105 are hinged to the second rods 106 through the hinge shaft 113. One end of the third rod 107 is hinged to the connecting rod seat 104, and the other end is hinged to the second rod 106. One end of the second rod 106 is fixed to the valve plate 101, and the other end is hinged to the third rod 107. The hinge shaft 113 is located between the first end and the second end.

[0032] Through the cooperation of the first rods 105, the second rods 106 and the third rod 107, the valve plate 101 is first translated along the center line of the valve body 100 when it is opened, and then starts to flip after reaching a certain distance. The opening operation of the valve plate 101 from the state of being perpendicular to the center line of the valve body 100 to the state of being parallel to the center line of the valve body 100 is completed. The operation is safe and reliable, and the sealing performance is good.

[0033] The above description is merely exemplary of some embodiments of the present disclosure and of the principles thereof. It is to be understood that the present disclosure is not limited to the specific technical features described above and that the scope of the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, but also covers other technical solutions formed by the combinations of the above technical features or equivalent features thereof without departing from the above inventive concept. For example, the above technical features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) to form technical solutions.

Claims

1. A passive nuclear power plant vent system isolation valve characterized by, The utility model relates to a valve, comprising: a valve body (100) in the shape of a pipe; a valve plate (101) arranged in the valve body (100) and used for opening and closing the valve body (100); a sealing element (102) arranged at one end of the valve body (100) and used for sealing between the valve body (100) and the valve plate (101); a valve rod (103) used for driving movement; a three-section eccentric connecting rod structure used for driving the valve rod (103) to drive the valve plate (101) to translate along the center line of the valve body (100) first and then turn to a state parallel to the center line of the valve body (100) when the valve plate (101) is opened; the three-section eccentric connecting rod structure comprises: a connecting rod seat (104) fixed to the inner wall of the valve body (100), wherein the valve rod (103) passes through the connecting rod seat (104); a first rod (105) fixed to the valve rod (103); a second rod (106) fixed to the valve plate (101), wherein a hinge shaft (113) is rotatably connected to the second rod (106), and the first rod (105) is hinged to the second rod (106) through the hinge shaft (113); a third rod (107) hinged at one end to the connecting rod seat (104) and hinged at the other end to the second rod (106).

2. The isolation valve of the passive ventilation system of the nuclear power plant according to claim 1, characterized in that: a first end of the second rod (106) is fixed to the valve plate (101), a second end of the second rod (106) is hinged to the third rod (107), and the hinge shaft (113) is located between the first end and the second end.

3. The isolation valve of the passive ventilation system of the nuclear power plant according to claim 2, characterized in that: the sealing element (102) comprises: a sealing ring holder (108) arranged on the inner side of the valve body (100), wherein the projection of the sealing ring holder (108) on the valve plate (101) has a part coinciding with the edge area of the valve plate (101); a sealing ring (109) arranged on the side of the sealing ring holder (108) close to the valve plate (101), wherein the sealing ring (109) has a part adhering to the edge area of the valve plate (101).

4. The isolation valve of the passive ventilation system of the nuclear power plant according to claim 3, characterized in that: both ends of the valve rod (103) pass through the valve body (100) and are provided with rotary seals at the passing-through positions.

5. The isolation valve of the passive ventilation system of the nuclear power plant according to claim 4, characterized in that: a cylindrical part (111) is arranged on the connecting rod seat (104), the valve rod (103) passes through the cylindrical part (111) and is provided with a bearing between the valve rod (103) and the cylindrical part (111).

6. The isolation valve of the passive ventilation system of the nuclear power plant according to claim 5, characterized in that: a driving part (110) is fixedly connected to the outer side of the valve body (100), and the valve rod is driven to rotate through the driving part (110).

7. The isolation valve of the passive ventilation system of the nuclear power plant according to claim 6, characterized in that: a sleeve (112) is fixedly connected to the valve rod (103), and one end of the first rod (105) is fixed to the sleeve (112).

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