A small-aperture gravity pressure relief butterfly valve

Abstract

The utility model discloses a small-aperture gravity pressure relief butterfly valve, which is designed to meet the system pressure relief and backflow prevention requirements in a narrow space environment. The valve is composed of a valve body, a valve plate, a protective cover, a fixed plate, a counterweight and other components. The valve body is designed to be cylindrical, with a connecting boss on the top and three connecting plates on the outer wall to facilitate the installation of the protective cover, simplifying installation in a narrow space. The valve body has a built-in fixed plate and a rib plate to enhance the structural stability, and the valve plate is equipped with a sealing gasket and a pressure plate to ensure sealing. The opening and closing speed is controlled by an L-shaped connector and an adjustable counterweight to achieve pressure release and automatic closing to prevent backflow of the medium. The innovation of this valve lies in its compact design and counterweight adjustment mechanism, which is suitable for installation in a narrow space, while ensuring efficient pressure relief and sealing performance, thereby improving the safety and reliability of the system.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear power ventilation equipment, in particular to a small-aperture gravity pressure relief butterfly valve. Background Art

[0002] Gravity pressure relief valves, as an indispensable safety component in nuclear-grade ventilation systems, play a vital role, especially in ensuring system pressure stability and preventing potential backflow risks. This type of valve is often deployed in areas where system pressure may increase abnormally. Its design principle is to use the positive pressure of the medium itself to drive the valve plate to open, thereby quickly releasing excessive pressure. When the system pressure returns to normal or negative pressure occurs, the valve plate automatically closes due to gravity, effectively preventing the backflow of outside air or other media, and ensuring the sealing and safety of the system.

[0003] However, in the face of the increasingly compact design trend of modern nuclear power facilities, traditional medium and large gravity pressure relief valves are often difficult to adapt to application scenarios with limited space due to their large size. Especially in nuclear reactor auxiliary facilities, pipeline-intensive areas or upgrade and renovation projects, the narrow installation conditions put forward higher requirements on the size of the pressure relief valve, and there is an urgent need to deeply optimize and miniaturize the existing valve structure to ensure that it can still efficiently perform its pressure relief function in a limited space. Summary of the invention

[0004] The purpose of the embodiment of the utility model is to provide a small-aperture gravity pressure relief butterfly valve to achieve system pressure relief in a narrow space.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is a small-aperture gravity pressure relief butterfly valve, including a valve body, a valve plate and a protective cover.

[0006] The valve body is a cylindrical body, with a circular annular boss on the top and three connecting plates on the outer wall of the cylinder; the valve body is fixed on the protective cover through the connecting plates;

[0007] A fixing plate is also provided on the outer wall of the valve body, one end of the fixing plate is anchored on the outer wall of the valve body through a rib plate, and an end cover bottom plate is provided on both sides of the other end; a bearing end cover is provided on each end cover bottom plate, a valve shaft is provided between the two bearing end covers, and both ends of the valve shaft are fixed to the bearing end covers by hexagon socket screws;

[0008] The valve plate is a circular plate with an area larger than the cross-section of the valve body. The contact surface between the valve plate and the valve body is equipped with a sealing gasket and is fastened by a pressure plate and bolts. A connecting body is arranged at the lower part of the valve plate, and an axial hole is arranged on the connecting body. The valve shaft passes through the axial hole to realize the limiting and opening and closing of the valve plate. One end of the connecting body is connected to the valve plate, and a counterweight is arranged at the other end.

[0009] Furthermore, the connector is specifically an L-shaped structure, one side of which is a cuboid and the other side of which is a rectangular sheet structure.

[0010] Furthermore, the counterweight is connected to the connecting body through bolts and nuts.

[0011] Furthermore, the bolt is fastened to the rectangular plate end of the connector via a nut on one side, the counterweight is sleeved on the bolt, and is clamped and fixed by two other nuts located at both ends of the bolt.

[0012] Furthermore, when the connecting body and the fixing plate are in contact, the angle formed by the valve plate and the horizontal plane is 50°.

[0013] Furthermore, sealant is applied between the protective cover and the valve body.

[0014] The beneficial effects of the utility model include the following points:

[0015] Spatial adaptability: The pressure relief valve has a compact cylindrical body design, especially the convenient connection between the top annular boss and the external pipe, as well as a flexibly adjustable protective cover, which significantly improves the convenience of installation in limited space and solves the problem of installation and application in small spaces.

[0016] Efficient pressure relief and backflow prevention: The combination of the valve body structure, L-shaped connector and counterweight system ensures that the valve can be quickly opened to a maximum opening of 50° under the action of positive airflow, achieving rapid and effective pressure release. At the same time, when there is no airflow or pressure balance, the valve can automatically close, effectively preventing system backflow and ensuring system safety and stability.

[0017] Adjustment flexibility and sealing: The sealing gasket between the valve plate and the valve body and the design of fastening by the pressure plate and bolts ensure a good sealing effect. The adjustability of the counterweight not only allows the valve opening and closing speed to be adjusted as needed, but also further improves the flexibility of operation and the adaptability of the system.

[0018] Stable structure and easy maintenance: The combination of the fixed plate and the rib plate, as well as the stable support structure of the bearing end cover and the valve shaft, not only enhances the overall mechanical strength, but also facilitates maintenance and overhaul, thus extending the service life of the valve.

[0019] To sum up, the pressure relief butterfly valve design of the utility model successfully overcomes the limitations of application in narrow spaces through a series of structural innovations and optimizations, achieves efficient execution of the pressure relief function, simplifies installation and use, and facilitates maintenance and management, and provides a reliable and practical solution for pressure control systems in narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a front view of a small-aperture gravity pressure relief butterfly valve;

[0022] Figure 2 This is the left side schematic diagram of a small-aperture gravity pressure relief butterfly valve;

[0023] Figure 3 This is a schematic diagram of the bottom of a small-aperture gravity pressure relief butterfly valve;

[0024] Figure 4 It is the structural diagram of the valve plate assembly.

[0025] Among them, 1. valve body; 2. connecting plate; 3. end cover bottom plate; 4. fixing plate; 5. rib plate; 6. protective cover; 7. pressure plate; 8. sealing gasket; 9. valve plate; 10. connecting body; 11. counterweight; 12. bearing end cover; 13. hexagon socket screw; 14. valve shaft. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The utility model provides a pressure relief butterfly valve suitable for installation and use in a narrow space, which can meet the pressure relief of the system in the narrow space and prevent the system from backflowing. Figure 1 The pressure relief valve includes a valve body 1, a valve plate 9, a protective cover 6 and a counterweight 11.

[0028] like Figures 1 to 3The valve body 1 is a cylindrical body with a circular annular boss on the top for connecting to an external pipeline; three connecting plates 2 are arranged on the outer wall of the cylinder; the valve member described in this embodiment also includes a protective cover 6, the specific form of which can be adjusted according to actual needs, and is fixed by combining with the preset connecting plate 2 on the outer wall of the cylinder. The protective cover 6 can not only protect the structure in the valve, but also has the function of isolating the medium; in the actual deployment scenario, the valve assembly with the protective cover 6 can be directly installed on the medium isolation surface, which greatly simplifies the installation process in a limited space. A fixing plate 4 is also arranged on the valve body 1, one end of which is anchored to the outer wall of the valve body 1 through a rib plate 5, and an end cover bottom plate 3 is arranged on both sides of the other end; a bearing end cover 12 is arranged on the end cover bottom plate 3; a valve shaft 14 is arranged between the two bearing end covers 12, and the two ends of the valve shaft 14 are fixed to the bearing end covers 12 through hexagon socket screws 13. Sealant is applied between the protective cover and the valve body.

[0029] like Figure 1 , 4 , the contact surface between the valve plate 9 and the valve body 1 is provided with a sealing gasket 8, and is fastened by a pressure plate 7 and bolts; an L-shaped connector 10 is provided at the lower part of the valve plate 9, one end of the connector 10 is connected to the valve plate 9, and a long bolt is provided at the other end, and is fastened to the connector 10 by a nut; a counterweight 11 is provided on the long bolt through two nuts, and the position and quantity of the counterweight 11 can be adjusted as needed to adjust the opening and closing speed of the valve plate 9, and the long bolt is made of high-strength material. An axial hole is also provided on the connector 10, and the valve shaft 14 passes through the axial hole to realize the limiting and opening and closing of the valve plate 9. When the connector 10 contacts the fixed plate 4, the angle between the valve plate 9 and the horizontal plane is 50°, and the valve plate 9 reaches the maximum opening.

[0030] The specific working process of the pressure relief valve described in this embodiment is as follows: when positive airflow is generated inside the system and pressure needs to be released, the force of the airflow first acts on the valve plate 9, and at this time, the L-shaped connector 10 and the counterweight 11 connected to the valve plate 9 begin to interact. The counterweight 11 moves upward due to the thrust of the airflow, overcomes its own weight, and drives the valve plate 9 to rotate counterclockwise (when viewed from above), and the valve plate 9 gradually opens until it forms a maximum opening angle of 50° with the horizontal plane, ensuring that the airflow can pass through unimpeded, thereby achieving the purpose of effective pressure relief.

[0031] When the internal pressure of the system is balanced or the positive airflow weakens or even disappears, the counterweight 11 naturally falls under the action of gravity, pushing the valve plate 9 to rotate in the clockwise direction and gradually closing the valve. This closing action is smooth and controllable, thanks to the adjustable counterweight 11 design, so that the closing rate of the valve plate 9 can be pre-set according to actual needs, which not only prevents the backflow of external media, but also ensures the stable operation of the system.

[0032] In the whole working cycle, whether opening to release pressure or closing to maintain sealing, the valve can be used in limited space conditions. The utility model has a compact structure and can achieve reliable operating performance while being able to adapt to application requirements in narrow spaces.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A small-aperture gravity pressure relief butterfly valve, comprising a valve body (1), a valve plate (9) and a protective cover (6), characterized in that: The valve body (1) is a cylindrical body, with a circular annular boss provided on the top, and three connecting plates (2) provided on the outer wall of the cylinder; the valve body (1) is fixed to the protective cover (6) via the connecting plates (2); The outer wall of the valve body (1) is also provided with a fixing plate (4), one end of the fixing plate (4) is anchored to the outer wall of the valve body (1) via a rib plate (5), and an end cover base plate (3) is provided on both sides of the other end; a bearing end cover (12) is provided on each end cover base plate (3), a valve shaft (14) is provided between the two bearing end covers (12), and both ends of the valve shaft (14) are fixed to the bearing end covers (12) via hexagon socket screws (13); The valve plate (9) is a circular plate member having an area larger than the cross-section of the valve body (1); the contact surface between the valve plate (9) and the valve body (1) is provided with a sealing gasket (8) and is fastened by a pressure plate (7) and bolts; a connecting body (10) is provided at the lower part of the valve plate (9); an axial hole is provided on the connecting body (10), and a valve shaft (14) passes through the axial hole to realize the limiting and opening and closing of the valve plate (9); one end of the connecting body (10) is connected to the valve plate (9), and a counterweight (11) is provided at the other end.

2. A small-aperture gravity pressure relief butterfly valve according to claim 1, characterized in that: The connector (10) is specifically an L-shaped structure, one side of which is a cuboid and the other side of which is a rectangular sheet structure.

3. A small-aperture gravity pressure relief butterfly valve according to any one of claims 1 and 2, characterized in that: The counterweight (11) is connected to the connecting body (10) via bolts and nuts.

4. A small-aperture gravity pressure relief butterfly valve according to claim 3, characterized in that: The bolt is fastened to the rectangular sheet end of the connecting body (10) via a nut on one side, and the counterweight (11) is sleeved on the bolt and clamped and fixed by two other nuts located at both ends of the bolt.

5. A small-aperture gravity pressure relief butterfly valve according to claim 1, characterized in that: When the connecting body (10) and the fixing plate (4) are in a contact state, the angle formed by the valve plate (9) and the horizontal plane is 50°.

6. A small-aperture gravity pressure relief butterfly valve according to claim 1, characterized in that: Sealant is applied between the protective cover (6) and the valve body (1).

Images