A low-low water level self-sealing check valve for nuclear power plants

Abstract

The utility model discloses a kind of for nuclear power station low low water level self-sealing check valve, including valve pipe, outlet pipe, inlet pipe, fixed seat, float ball rod, float ball, spring, valve core and filter structure;The utility model inserts stud into elastic card piece inside, elastic card piece hand is opened, to be fixed by elastic card piece to stud, to realize filter screen is fixed in inlet pipe inside, when water enters inlet pipe inside, it will pass filter screen, filter screen can filter magazine in water, to realize the impurity in water can be filtered, and filtered impurity will be stored in collection groove, avoid impurity accumulation on valve seat, cause the problem of valve core and valve seat close not tightly, pull filter screen upwards, so that stud is extracted elastic card piece, to realize the beneficial effect of convenient disassembly to filter screen, convenient cleaning maintenance.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically a self-sealing check valve for low-low water levels in nuclear power plants. Background Technology

[0002] A check valve is a type of valve whose opening and closing element is a circular valve disc that relies on its own weight and the pressure of the medium to prevent backflow of the medium. The low-level self-sealing check valve in a nuclear power plant is a valve installed at the outlet of the water supply and has a self-sealing function when the water level is low.

[0003] Existing self-sealing check valves have the following problems: Existing self-sealing check valves suffer from problems due to the presence of impurities in the water. Over time, these impurities tend to accumulate on the valve seat, leading to a poor seal between the valve core and the valve seat. Utility Model Content

[0004] The purpose of this invention is to provide a self-sealing check valve for low-low water levels in nuclear power plants, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a self-sealing check valve for low-low water levels in nuclear power plants, comprising a valve pipe, an outlet pipe at the lower end of the valve pipe, an inlet pipe on the valve pipe, a fixed seat fixed in the inlet pipe, a float rod connected to the fixed seat, a float ball at the end of the float rod, a spring fixed on the float rod, a valve core at the end of the float rod, and a filter structure on the inlet pipe, the filter structure comprising a filter screen, the filter screen being disposed in the inlet pipe, and a collection trough being disposed in the filter screen.

[0006] Preferably, the water inlet pipe is provided with elastic clips inside, and there are at least two elastic clips, which are symmetrically arranged in the water inlet pipe.

[0007] Preferably, the filter screen surface is fixed with a post, which can be inserted into an elastic clip.

[0008] Preferably, when the elastic clips are in a naturally contracted state without being subjected to force, the spacing is less than the thickness of the insert.

[0009] Preferably, a roller seat is fixed in the insert, and a roller is connected inside the roller seat.

[0010] Preferably, the roller protrudes from the surface of the insert post.

[0011] Compared with the prior art, the beneficial effects of this utility model are: Insert the insert into the elastic clip, which then expands and secures the insert, thus fixing the filter screen inside the inlet pipe. When water enters the inlet pipe, it passes through the filter screen, which filters out impurities. The filtered impurities are collected in the collection tank, preventing them from accumulating on the valve seat and causing a problem with the valve core and seat not closing properly. Pulling the filter screen upwards allows the insert to be removed from the elastic clip, enabling easy disassembly of the filter screen for cleaning and maintenance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a frontal cross-sectional view of the present invention.

[0014] Figure 3 This is a schematic diagram of the docking structure between the insert and the elastic clip of this utility model.

[0015] Figure 4 This is a schematic diagram of the elastic clip of this utility model in the unloaded state.

[0016] Figure 5 This is a side cross-sectional view of the docking structure of the insert and the elastic clip of this utility model.

[0017] In the diagram: Valve pipe-1, Outlet pipe-2, Inlet pipe-3, Fixing seat-4, Float rod-5, Float-6, Spring-7, Valve core-8, Filter structure-9, Filter screen-91, Collection tank-901, Elastic clip-92, Insert post-93, Roller seat-94, Roller-95. Detailed Implementation

[0018] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0019] Please see Figure 1 and Figure 2 This utility model provides a self-sealing check valve for low water level in nuclear power plants, including a valve pipe 1, an outlet pipe 2 integrally formed at the lower end of the valve pipe 1, an inlet pipe 3 integrally formed at the upper end of the valve pipe 1, a fixed seat 4 fixed in the inlet pipe 3, a float rod 5 vertically slidably connected in the fixed seat 4, a float 6 fixed at the upper end of the float rod 5, a spring 7 fixed on the surface of the float rod 5, the spring 7 fixed inside the fixed seat 4, a valve core 8 fixed at the lower end of the float rod 5, and a filter structure 9 provided on the inlet pipe 3.

[0020] Specifically, the outlet pipe 2 is fixed to the bottom of the water storage tank and connected to the outlet of the water storage tank through a flange. When the water level in the water storage tank is higher than the float ball 6, the float ball 6 will move upward under its action, and then pull the float rod 5 to separate the valve core 8 from the valve seat, thereby opening the valve. When the water level is lower than the float ball 6, under the action of buoyancy and spring 7, the valve core 8 will close with the valve seat, thereby closing the valve, so as to achieve the effect of automatic sealing at low water levels.

[0021] Please see Figure 2 , Figure 3 , Figure 4 and Figure 5 This utility model provides a self-sealing check valve for low water levels in nuclear power plants. The filter structure 9 includes a filter screen 91. The filter screen 91 is installed in the water inlet pipe 3 and extends into the interior of the water inlet pipe 3. A collection groove 901 is formed in the filter screen 91. Elastic clips 92 are fixed inside the left and right ends of the water inlet pipe 3. Of course, there can also be three or four, etc., which is not limited here. Inserts 93 are fixed on the surface of the filter screen 91. The number of inserts 93 is the same as that of the elastic clips 92. The inserts 93 can be inserted into the elastic clips 92 for better fixing effect.

[0022] When the elastic clip 92 is in a naturally contracted state without being subjected to force, the spacing is less than the thickness of the insert post 93. A roller seat 94 is fixed in the insert post 93, and a roller 95 is connected inside the roller seat 94. The roller 95 protrudes from the surface of the insert post 93, resulting in a more stable installation effect and making it less likely for the filter screen 91 to fall off.

[0023] Specifically, the insert 93 is inserted into the elastic clip 92, which is then opened to fix the insert 93 in place, thus securing the filter screen 91 inside the inlet pipe 3. When water enters the inlet pipe 3, it passes through the filter screen 91, which filters out impurities in the water. The filtered impurities are then stored in the collection tank 901, preventing them from accumulating on the valve seat and causing the valve core 8 to not close properly. Pulling the filter screen 91 upwards allows the insert 93 to be removed from the elastic clip 92, enabling easy disassembly of the filter screen 91 for cleaning and maintenance.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-sealing check valve for low-low water level in a nuclear power plant, comprising a valve pipe (1), an outlet pipe (2) at the lower end of the valve pipe (1), an inlet pipe (3) on the valve pipe (1), a fixing seat (4) fixed in the inlet pipe (3), a float rod (5) connected in the fixing seat (4), a float (6) at the end of the float rod (5), a spring (7) fixed on the float rod (5), and a valve core (8) at the end of the float rod (5), characterized in that: It also includes a filter structure (9), on which the water inlet pipe (3) is provided a filter structure (9), the filter structure (9) includes a filter screen (91), the water inlet pipe (3) is provided with a filter screen (91), and the filter screen (91) is provided with a collection tank (901).

2. The self-sealing check valve for low-low water level in nuclear power plants according to claim 1, characterized in that: The water inlet pipe (3) is provided with an elastic clip (92), and there are at least two elastic clips (92) arranged symmetrically in the water inlet pipe (3).

3. The self-sealing check valve for low-low water level in nuclear power plants according to claim 2, characterized in that: The filter screen (91) has a fixed post (93) on its surface, and the post (93) can be inserted into the elastic clip (92).

4. The self-sealing check valve for low-low water level in nuclear power plants according to claim 3, characterized in that: When the elastic clip (92) is in a naturally contracted state without being subjected to force, the spacing is less than the thickness of the insert (93).

5. A self-sealing check valve for low-low water level in nuclear power plants according to claim 1, characterized in that: A roller seat (94) is fixed in the insert (93), and a roller (95) is connected inside the roller seat (94).

6. A self-sealing check valve for low-low water level in nuclear power plants according to claim 5, characterized in that: The roller (95) protrudes from the surface of the insert (93).

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