Adjustable airtight valve special for nuclear island

Abstract

The utility model discloses a special adjustable airtight valve for a nuclear island. The special adjustable airtight valve comprises a valve base, a middle shaft adapter, a middle shaft piece and a control valve, a plurality of vent holes are formed in the inner ring of the valve base. The middle shaft piece is rotationally connected to the valve base. The control valve is fixed to the inner end of the middle shaft piece and provided with a plurality of first air guide holes matched with the vent holes. According to the utility model, the valve base of which the inner ring is provided with the plurality of vent holes is arranged on the protective door. And a control valve driven by a middle shaft piece is arranged on the inner side of the protective door. And a plurality of first air guide holes communicated with the vent holes are formed in the control valve. And meanwhile, a plurality of second air guide holes matched with the first air guide holes are formed in the protective door. And by driving the control valve to rotate, the balance of internal and external air pressure when the plant stops working is realized. Meanwhile, when the equipment in the plant works, the equipment is matched with the protective door, so that the plant is in a sealed state.

Description

Technical Field

[0001] The utility model belongs to the technical field of airtight valves, and in particular relates to an adjustable airtight valve dedicated to a nuclear island. Background Art

[0002] The nuclear island plant is usually a closed plant, where the equipment works and is isolated from the outside world to prevent radioactive elements from affecting outside operators. A protective door is set up on one side of the plant so that operators can open the protective door and perform maintenance on the equipment in the nuclear island when the equipment in the plant stops working.

[0003] In the prior art, after the nuclear island plant is in cyclic operation, negative pressure will be formed inside the plant. The protective door will be adsorbed on the door frame due to the negative pressure, making it difficult for operators to enter the plant to maintain the equipment. Some plants use one-way controlled air relief valves, and operators can open the air relief valves from the outside to achieve a balance of air pressure inside and outside the plant. However, when the operator enters the plant and the protective door is suddenly closed, the negative pressure inside the plant makes it difficult for the staff to open the protective door from the inside, causing trouble.

[0004] Therefore, there is an urgent need for a device installed on the protective door, which can be operated by operators from the outside or inside of the factory building when the factory building stops working, so as to achieve the balance of the internal and external air pressure of the factory building. At the same time, it can cooperate with the protective door to form a sealed state when the equipment in the factory building is working. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art, the utility model provides an adjustable airtight valve dedicated to a nuclear island to solve the technical problem that a protective door is difficult to open due to internal negative pressure.

[0006] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0007] A nuclear island-specific adjustable airtight valve comprises a valve base, a central axis adapter, a central axis and a control valve. The inner ring of the valve base is provided with a plurality of vents. The central axis is rotatably connected to the valve base. The control valve is fixed to the inner end of the central axis and is provided with a plurality of first air guide holes matched with the vents.

[0008] Furthermore, an arc-shaped positioning groove is provided on the control valve; a positioning pin is arranged in the arc-shaped positioning groove for limiting the extreme position of the rotation of the control valve.

[0009] Furthermore, there are two arc-shaped positioning grooves in total; the two arc-shaped positioning grooves are symmetrically arranged on the control valve.

[0010] Furthermore, the device also includes a central axis adapter, which is sleeved on the central axis and has an outer end fixed to the valve base.

[0011] Furthermore, the central axis adapter has a tapered structure with a small inner diameter and a large outer diameter.

[0012] Furthermore, rotating wheels are fixed to both ends of the central axis.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1. The utility model provides a valve base with a plurality of vents in the inner circle on the protective door. A control valve driven by a central axis is provided on the inner side of the protective door. A plurality of first air guide holes connected to the vents are provided on the control valve. At the same time, a plurality of second air guide holes matched with the first air guide holes are provided on the protective door. By driving the rotation of the control valve, the balance of the internal and external air pressures is achieved when the factory stops working. At the same time, when the equipment in the factory is working, it cooperates with the protective door to make the factory sealed.

[0015] 2. The utility model provides a conical central axis adapter so that the outside air entering from the vent hole of the valve base will be guided through the conical central axis adapter, so that the outside air can be quickly guided to the first air guide hole, thereby accelerating the balance of the internal and external air pressures and reducing the time required for balancing the internal and external air pressures.

[0016] 3. The utility model provides a rotating wheel capable of driving and controlling the rotation of the valve on both the inner and outer sides of the protective door, so that the operator can operate the device from the outside or inside of the factory building, thereby achieving a balance of the internal and external air pressures of the factory building. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is an explosion diagram of the utility model;

[0019] Figure 3 The utility model is installed on the protective door schematic diagram.

[0020] Figure numerals: 1. valve base; 2. central axis adapter; 3. central axis member; 4. control valve; 6. air vent; 7. first air guide hole; 8. arc-shaped positioning groove; 9. rotating wheel; 10. protective door. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] The utility model will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1 and 2 As shown, a nuclear island-specific adjustable airtight valve is installed on the protective door 10 in the nuclear island, and is used to balance the air pressure inside the nuclear island and the outside world, so as to avoid the protective door 10 from being adsorbed and unable to be opened due to excessive positive and negative pressure differences between the inside and outside. The adjustable airtight valve includes a valve base 1, a central axis adapter 2, a central axis member 3 and a control valve 4. Among them, the valve base 1 is fixedly set on the protective door 10, and a plurality of air vents 6 are provided on the inner ring. The central axis member 3 is rotatably connected to the valve base 1. The control valve 4 is fixed to the inner end of the central axis member 3, and a plurality of first air guide holes 7 connected to the air vents 6 are provided. A plurality of second air guide holes matching the first air guide holes 7 are provided on the protective door 10.

[0024] like Figure 3 As shown, when the operator operates, by rotating the central axis 3, the control valve 4 is driven to rotate. When the first air guide hole 7 on the control valve 4 is aligned with the second air guide hole on the protective door 10. The inner area of ​​the protective door 10 is connected to the outside world. The outside air flows into the inner area of ​​the protective door 10 through the vent 6, the first air guide hole 7 and the second air guide hole, so that the air pressure inside and outside the protective door 10 is balanced, and the protective door 10 is prevented from being adsorbed on the door frame and unable to open due to the air pressure in the inner area being too low. When the control valve 4 rotates, so that the first air guide hole 7 and the second air guide hole are misaligned, the control valve 4 forms a seal on the second air guide hole, so that the inner area of ​​the protective door 10 is a closed space.

[0025] Furthermore, two symmetrically arranged arc-shaped positioning grooves 8 are provided on the control valve 4. A positioning pin is provided in the arc-shaped positioning groove 8. One end of the positioning pin is fixed on the protective door 10, and can limit the two rotation limit positions of the control valve 4. When the control valve 4 rotates clockwise until the positioning pin abuts against one end of the arc-shaped positioning groove 8, the first air guide hole 7 on the control valve 4 is aligned with the second air guide hole on the protective door 10.

[0026] like Figure 1 and 3As shown, the central axis adapter 2 is sleeved on the central axis 3, and the outer end is fixed to the valve base 1. The central axis adapter 2 has a conical structure with a small inner diameter and a large outer diameter. When in use, the outside air entering from the vent hole 6 of the valve base 1 will be guided through the central axis adapter 2 with a conical structure, so that the outside air can be quickly guided to the first air guide hole 7, accelerating the balance of the internal and external air pressures.

[0027] Furthermore, both ends of the central axis 3 are fixed with a rotating wheel 9, which can facilitate the operator to drive the central axis 3 to rotate. After the work in the nuclear island is completed, the operator can rotate the rotating wheel 9 located at the outer end of the central axis 3 to allow the air inside and outside the protective door 10 to circulate, balance the internal and external air pressure, and realize the opening of the protective door 10 that forms a negative pressure state on the inner area on the outer side of the protective door 10. When the operator enters the inner side of the protective door 10 and the protective door 10 is suddenly closed and adsorbed due to the negative pressure in the inner area, the operator can rotate the rotating wheel 9 located at the inner end of the central axis 3 to open the protective door 10.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An adjustable airtight valve for nuclear island, characterized in that: The valve base (1) comprises a valve seat (1), a central axis adapter (2), a central axis member (3) and a control valve (4); the inner ring of the valve base (1) is provided with a plurality of vent holes (6); the central axis member (3) is rotatably connected to the valve base (1); the control valve (4) is fixed to the inner end of the central axis member (3) and is provided with a plurality of first air guide holes (7) that match the vent holes (6).

2. The adjustable airtight valve for nuclear island according to claim 1, characterized in that: The control valve (4) is provided with an arc-shaped positioning groove (8); a positioning pin is arranged in the arc-shaped positioning groove (8) for limiting the extreme position of rotation of the control valve (4).

3. The adjustable airtight valve for nuclear island according to claim 2, characterized in that: There are two arc-shaped positioning grooves (8) in total; the two arc-shaped positioning grooves (8) are symmetrically arranged on the control valve (4).

4. The adjustable airtight valve for nuclear island according to claim 1, characterized in that: It also comprises a middle axis adapter (2), wherein the middle axis adapter (2) is sleeved on the middle axis (3), and the outer end of the middle axis adapter (2) is fixed to the valve base (1).

5. The adjustable airtight valve for nuclear island according to claim 4, characterized in that: The central axis adapter (2) has a conical structure with a small inner end diameter and a large outer end diameter.

6. The adjustable airtight valve for nuclear island according to claim 1, characterized in that: Rotating wheels (9) are fixed to both ends of the central shaft (3).

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