Nuclear power pneumatic stop valve with elastic seal

Abstract

The utility model discloses a nuclear power pneumatic stop valve with an elastic seal, and relates to the field of stop valves. The nuclear power pneumatic stop valve with the elastic seal comprises a valve body, a valve cover and a cylinder barrel, the valve cover is installed between the valve body and the cylinder barrel, a valve rod is movably inserted into the valve cover, the outer side of the valve rod is fixedly sleeved with a connecting ring, and the connecting ring is fixedly connected with an elastic corrugated pipe; a valve clack is installed at the bottom end of the valve rod, a cylinder cover is fixedly installed in the cylinder barrel, a piston is fixedly connected to the top end of the valve rod, and a spring is fixedly connected between the top of the piston and the inner top wall of the cylinder barrel. According to the nuclear power pneumatic stop valve with the elastic seal, when the valve rod moves upwards under the action of the piston, the connecting ring at the top of the elastic corrugated pipe can be pulled to move, the elastic corrugated pipe is stretched, and at the moment, even if a medium enters the valve cover, the medium cannot penetrate through the elastic corrugated pipe to continue to move upwards; therefore, the sealing effect is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a nuclear power pneumatic stop valve with elastic sealing. Background Art

[0002] Nuclear electric pneumatic stop valve refers to a stop valve that uses a pneumatic device powered by compressed air to drive the valve action. It is usually installed in the nuclear island N1, conventional island CI and power plant auxiliary facilities BOP system of nuclear power plants to control the on and off of fluids.

[0003] Existing pneumatic stop valves generally use compressed air to drive the piston to overcome the friction with the cylinder body and the spring force to drive the valve disc to move upward, and the valve opens; for air shut-off valves, the action is the opposite, but after long-term use, the medium in the valve body may enter the valve cover and cylinder body along the outside of the valve stem, which will affect the movement of the compressed air-driven piston in the cylinder body, and thus affect the opening and closing of the pneumatic stop valve. Therefore, this application proposes a nuclear electric pneumatic stop valve with an elastic seal. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a nuclear electric pneumatic stop valve with elastic seal, which solves the problem that after long-term use, the medium in the valve body may enter the valve cover and cylinder body along the outside of the valve stem, thereby affecting the movement of the compressed air-driven piston in the cylinder body, and thus affecting the opening and closing of the pneumatic stop valve.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a nuclear electric pneumatic stop valve with elastic seal, comprising a valve body, a valve cover, and a cylinder, wherein the valve cover is installed between the valve body and the cylinder, a valve stem is movably inserted into the interior of the valve cover, a connecting ring is fixedly sleeved on the outside of the valve stem, an elastic bellows is fixedly connected to the connecting ring, the elastic bellows is movably sleeved on the outside of the valve stem, and the bottom end of the elastic bellows is fixedly connected to the valve cover;

[0006] The bottom end of the valve stem extends toward the interior of the valve body and is installed with a valve disc, the cylinder cover is fixedly installed inside the cylinder, and the top end of the valve stem extends toward the cylinder and is fixedly connected to a piston, and a spring is fixedly connected between the top of the piston and the inner top wall of the cylinder.

[0007] Preferably, a liquid inlet channel and a liquid outlet channel are respectively provided on both sides of the valve body, a connecting port connected to the liquid inlet channel and the liquid outlet channel is provided inside the valve body, a valve head is fixedly installed at the bottom of the valve disc, and the valve head is tightly fitted to the inner wall of the connecting port.

[0008] Preferably, branch pipes are installed at both ends of the valve body, and the branch pipes on both sides are respectively connected to the liquid inlet channel and the liquid outlet channel.

[0009] Preferably, a valve cover nut is installed on the outer side of the connection between the valve body and the valve cover.

[0010] Preferably, an air pipe joint is installed on the outside of the cylinder, and the inside of the air pipe joint is connected to the space between the cylinder cover and the piston.

[0011] The utility model discloses a nuclear power pneumatic stop valve with elastic seal, which has the following beneficial effects:

[0012] This nuclear electric pneumatic stop valve with elastic seal uses an elastic bellows arranged on the outer side of the valve stem. When the valve stem moves upward under the action of the piston, on the one hand, it drives the valve disc at the bottom end of the valve stem to move and open the valve body. On the other hand, it can pull the connecting ring at the top of the elastic bellows to move, thereby stretching the elastic bellows. At this time, even if a medium enters the valve cover, it cannot pass through the elastic bellows and continue to move upward, thereby further improving the sealing effect. When the valve stem moves downward under the action of the piston, the elastic bellows can be reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a cross-sectional view of the utility model;

[0016] Figure 3 This is a cross-sectional view of the valve body and valve cover of the utility model;

[0017] Figure 4 It is a cross-sectional view of the cylinder of the present utility model.

[0018] In the figure: 1. Valve body; 11. Liquid inlet channel; 12. Liquid outlet channel; 13. Connecting port; 2. Valve cover; 21. Valve stem; 22. Valve disc; 23. Valve head; 24. Connecting ring; 25. Elastic bellows; 3. Cylinder; 31. Cylinder head; 32. Piston; 33. Spring; 4. Valve cover nut; 5. Branch pipe; 6. Air pipe joint. DETAILED DESCRIPTION

[0019] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] The embodiment of the utility model discloses a nuclear power pneumatic stop valve with elastic seal.

[0021] According to the attached Figure 1-4 As shown, it includes a valve body 1, a valve cover 2, and a cylinder 3. The valve cover 2 is installed between the valve body 1 and the cylinder 3. A valve stem 21 is movably inserted into the interior of the valve cover 2. A connecting ring 24 is fixedly sleeved on the outside of the valve stem 21. The connecting ring 24 is fixedly connected to an elastic bellows 25. The elastic bellows 25 is movably sleeved on the outside of the valve stem 21, and the bottom end of the elastic bellows 25 is fixedly connected to the valve cover 2.

[0022] The bottom end of the valve stem 21 extends toward the interior of the valve body 1 and is installed with a valve disc 22, the cylinder cover 31 is fixedly installed inside the cylinder 3, and the top end of the valve stem 21 extends toward the cylinder 3 and is fixedly connected to a piston 32, and a spring 33 is fixedly connected between the top of the piston 32 and the inner top wall of the cylinder 3.

[0023] Through the elastic bellows 25 arranged on the outside of the valve stem 21, when the valve stem 21 moves upward under the action of the piston 32, on the one hand, it drives the valve disc 22 at the bottom end of the valve stem 21 to move, opening the valve body 1, and on the other hand, it can pull the connecting ring 24 at the top of the elastic bellows 25 to move, thereby stretching the elastic bellows 25. At this time, even if medium enters the valve cover 2, it cannot pass through the elastic bellows 25 and continue to move upward, thereby further improving the sealing effect. When the valve stem 21 moves downward under the action of the piston 32, the elastic bellows 25 can be reset.

[0024] Furthermore, a liquid inlet channel 11 and a liquid outlet channel 12 are respectively provided on both sides of the valve body 1, and a connecting port 13 connected to the liquid inlet channel 11 and the liquid outlet channel 12 is provided inside the valve body 1. A valve head 23 is fixedly installed at the bottom of the valve disc 22, and the valve head 23 fits tightly against the inner wall of the connecting port 13.

[0025] Through the provided liquid inlet channel 11, liquid outlet channel 12 and connecting port 13, when the valve flap 22 moves upward, the valve head 23 is separated from the inner wall of the connecting port 13, so that the liquid inlet channel 11, liquid outlet channel 12 and connecting port 13 are connected; when the valve flap 22 moves downward, the valve head 23 fits tightly with the inner wall of the connecting port 13, thereby sealing the connecting port 13.

[0026] Furthermore, branch pipes 5 are installed at both ends of the valve body 1, and the branch pipes 5 on both sides are respectively connected to the liquid inlet channel 11 and the liquid outlet channel 12.

[0027] Furthermore, a valve cover nut 4 is installed on the outer side of the connection between the valve body 1 and the valve cover 2. By providing the valve cover nut 4, the installation and connection of the valve body 1 and the valve cover 2 are facilitated.

[0028] Furthermore, an air pipe joint 6 is installed on the outside of the cylinder 3 , and the interior of the air pipe joint 6 is connected to the space between the cylinder head 31 and the piston 32 .

[0029] Through the provided air pipe joint 6, the air pipe joint 6 is connected to an external air pump, and compressed air can be injected into the space between the cylinder head 31 and the piston 32, which can drive the piston 32 to move upward. At the same time, the air can be extracted from the space between the cylinder head 31 and the piston 32, and the piston 32 can be driven downward under the action of air pressure.

[0030] Through the elastic bellows 25 arranged on the outside of the valve stem 21, when the valve stem 21 moves upward under the action of the piston 32, on the one hand, it drives the valve disc 22 at the bottom end of the valve stem 21 to move, opening the valve body 1, and on the other hand, it can pull the connecting ring 24 at the top of the elastic bellows 25 to move, thereby stretching the elastic bellows 25. At this time, even if medium enters the valve cover 2, it cannot pass through the elastic bellows 25 and continue to move upward, thereby further improving the sealing effect. When the valve stem 21 moves downward under the action of the piston 32, the elastic bellows 25 can be reset.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A nuclear electric pneumatic stop valve with elastic seal, comprising a valve body (1), a valve cover (2), and a cylinder (3), wherein the valve cover (2) is installed between the valve body (1) and the cylinder (3), and is characterized in that: The valve cover (2) has a valve stem (21) movably inserted inside, a connecting ring (24) fixedly sleeved on the outside of the valve stem (21), an elastic bellows (25) fixedly connected to the connecting ring (24), the elastic bellows (25) movably sleeved on the outside of the valve stem (21), and the bottom end of the elastic bellows (25) is fixedly connected to the valve cover (2); The bottom end of the valve stem (21) extends toward the interior of the valve body (1) and is installed with a valve flap (22), the interior of the cylinder barrel (3) is fixedly installed with a cylinder cover (31), and the top end of the valve stem (21) extends toward the cylinder barrel (3) and is fixedly connected to a piston (32), and a spring (33) is fixedly connected between the top of the piston (32) and the inner top wall of the cylinder barrel (3).

2. A nuclear power pneumatic stop valve with elastic seal according to claim 1, characterized in that: A liquid inlet channel (11) and a liquid outlet channel (12) are respectively provided on both sides of the valve body (1), a communication port (13) communicating with the liquid inlet channel (11) and the liquid outlet channel (12) is provided inside the valve body (1), a valve head (23) is fixedly mounted on the bottom of the valve flap (22), and the valve head (23) is tightly fitted to the inner wall of the communication port (13).

3. A nuclear power pneumatic stop valve with elastic seal according to claim 2, characterized in that: Branch pipes (5) are installed at both ends of the valve body (1), and the branch pipes (5) on both sides are respectively connected to the liquid inlet channel (11) and the liquid outlet channel (12).

4. A nuclear power pneumatic stop valve with elastic seal according to claim 1, characterized in that: A valve cover nut (4) is installed on the outer side of the connection between the valve body (1) and the valve cover (2).

5. The nuclear power pneumatic stop valve with elastic seal according to claim 1, characterized in that: An air pipe joint (6) is installed on the outside of the cylinder (3), and the interior of the air pipe joint (6) is connected to the space between the cylinder cover (31) and the piston (32).

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