Check valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a check valve which comprises a valve body, a valve rod, a valve rod, a valve rod and a valve rod. The valve seat is arranged in the valve body, a valve shaft is hinged to the valve seat, a rocker arm is arranged on the valve shaft, and a valve plate is fixed to the rocker arm; the sealing structure comprises a first sealing piece arranged on the valve plate and a second sealing piece arranged between the valve body and the valve cover; a liquid inlet is formed in the tail end of the flow inlet channel, one end of the valve plate is a connecting end used for being connected with the rocker, and the other end of the valve plate is a sealing end used for blocking the liquid inlet. The valve has the beneficial effects that the sealing structure is arranged and comprises the first sealing piece on the valve plate and the second sealing piece between the valve body and the valve deck, and the sealing effect is effectively improved. Leakage points on the sealing surface are reduced, so that the overall sealing performance of the valve is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valves, and particularly relates to a check valve. BACKGROUND

[0002] The check valve, also known as a non-return valve, a one-way valve, a backflow valve or an isolation valve, is an important fluid control device which can prevent backflow of downstream medium and is widely used in a pipeline system. When fluid flows in from an inlet end, a valve clapper (an opening and closing member) is opened under the action of medium pressure, and the medium can flow. When fluid backflows, the valve clapper is closed under the double actions of its own weight and backflow medium pressure, thereby cutting off the flow path and preventing damage caused by backflow.

[0003] Patent No. CN101251203B discloses a check valve which comprises a valve seat and a valve clapper. The check valve further comprises a damper which is installed on a wall of an inner cavity of the valve seat and is connected between end portions of the valve clapper and the valve seat through a flexible member. The damper generates a reverse resistance to the valve clapper when the valve clapper approaches a closed position, thereby slowing down the closing speed of the valve clapper and reducing the impact force on a sealing surface of the valve seat.

[0004] The above patent can eliminate the impact between the valve clapper and the sealing seat and the water hammer phenomenon by arranging the damper. Although this effect can be achieved, the structure of the damper affects the sealing of the valve clapper, thereby reducing the sealing effect. Therefore, the structure needs to be improved. SUMMARY

[0005] The application aims to provide a check valve which can solve the above problems.

[0006] The application aims to provide a check valve which comprises:

[0007] A valve body which is internally provided with an inlet flow channel and an outlet flow channel and is provided at a top portion with a valve cover;

[0008] A valve seat which is arranged in the valve body and is hingedly provided with a valve shaft, the valve shaft is provided with a rocker arm, and the rocker arm is fixed with a valve plate;

[0009] A sealing structure which comprises a first sealing member arranged on the valve plate and a second sealing member arranged between the valve body and the valve cover;

[0010] The end of the inlet flow channel is provided with an inlet opening, one end of the valve plate is a connecting end for connecting with the rocker arm, and the other end is a sealing end for plugging the inlet opening.

[0011] The valve plate can be flexibly and stably opened and closed to the liquid inlet through the hinged structure of the valve plate on the valve seat. When the fluid flows from the flow channel, the valve plate is automatically opened under the action of fluid pressure, allowing the fluid to flow smoothly. When the fluid pressure decreases or reverses, the valve plate is automatically closed due to gravity, effectively preventing backflow of the fluid. The sealing structure is composed of the first sealing element on the valve plate and the second sealing element between the valve body and the valve cover, ensuring high sealing performance of the valve in the closed state.

[0012] By setting the sealing structure, including the first sealing element on the valve plate and the second sealing element between the valve body and the valve cover, the sealing effect is effectively improved. The leakage points on the sealing surface are reduced, thereby improving the overall sealing performance of the valve. Through the hinged valve shaft on the valve seat and the rocker arm structure, the valve plate can be stably opened and closed, reducing the valve shaking and instability caused by impact and water hammer phenomenon.

[0013] Further, the first sealing element comprises:

[0014] A sealing ring is arranged outside the valve plate.

[0015] A sealing port is arranged on the liquid inlet and in contact with the sealing ring.

[0016] An annular extension is arranged on the outer circumferential surface of the sealing ring and protrudes outward.

[0017] Wherein, the annular extension is extruded after contacting with the sealing port, and forms a sealing outer ring for realizing the axial sealing of the first sealing element.

[0018] The first sealing element realizes the basic sealing function through the direct contact of the sealing ring and the sealing port. The arrangement of the annular extension greatly enhances the reliability of the sealing. When the valve plate is closed, the annular extension contacts and is extruded by the sealing port, forming a tight sealing outer ring, effectively preventing fluid leakage from the axial direction.

[0019] At the same time, the arrangement of the annular extension not only enhances the sealing effect, but also improves the durability of the sealing. Since it protrudes outward on the outer circumferential surface of the sealing ring, the sealing surface is wider, reducing the wear of the sealing ring, thereby prolonging the service life of the sealing element. The tight fit between the annular extension and the sealing port enables the first sealing element to adapt to changes in fluid pressure. When the fluid pressure increases, the annular extension will be extruded more, thereby more tightly adhering to the sealing port to maintain the sealing effect. Conversely, when the fluid pressure decreases, the annular extension can also relax accordingly to avoid sealing failure caused by excessive extrusion.

[0020] Further, the annular extension is inclined to the outside of the sealing port after being extruded, and a sealing cavity is formed between the annular extension and the side wall of the sealing port.

[0021] When the annular extension is tilted outward after being compressed, it forms a sealing cavity between the annular extension and the side wall of the sealing seat. The existence of the sealing cavity makes the fluid pressure more evenly distributed on the sealing surface, reducing the damage of local high pressure to the sealing ring, thereby enhancing the reliability and durability of the seal. At the same time, after the annular extension is tilted outward and forms a sealing cavity, it actually provides an additional support structure for the sealing surface, which helps to maintain the stability of the sealing surface, so that the sealing effect remains unchanged even in the case of fluid pressure fluctuations or temperature changes.

[0022] In addition, the formation of the sealing cavity further reduces the path of fluid leakage. Even if the fluid can penetrate near the sealing surface, it must bypass the sealing cavity to continue to leak, which increases the difficulty of fluid leakage and improves the sealing performance of the valve.

[0023] Further, the first sealing member further comprises a sealing protrusion arranged on the sealing ring, and the sealing protrusion is in contact with the bottom of the sealing seat and forms a radial seal.

[0024] The sealing protrusion is arranged to contact the bottom of the sealing seat and form a radial seal, effectively preventing fluid from leaking from the radial gap between the sealing ring and the sealing seat, further enhancing the sealing performance of the check valve. The close contact between the sealing protrusion and the bottom of the sealing seat provides an additional sealing barrier for the valve. Even in the case of slight wear or deformation of other sealing surfaces, the sealing protrusion can still maintain effective sealing effect, thereby improving the reliability of the entire sealing structure.

[0025] Further, the sealing protrusion is provided in a plurality, and the plurality of sealing protrusions are connected to form a wave shape.

[0026] The wave-shaped design of the plurality of sealing protrusions connected together makes the sealing surface more flexible and better adapts to the slight unevenness or deformation of the bottom of the sealing seat. It helps to maintain the close contact between the sealing protrusion and the bottom of the sealing seat, and can achieve effective sealing even in the case of slight differences in the sealing surface.

[0027] At the same time, the wave-shaped sealing protrusion increases the contact area between the sealing surface and the bottom of the sealing seat, thereby improving the sealing effect. Each sealing protrusion can act as an independent sealing point, and even if one or several sealing points are worn or fail, the other sealing points can still maintain effective sealing effect, thereby enhancing the reliability of the entire sealing structure.

[0028] Further, the second sealing member comprises a sealing gasket arranged between the valve body and the valve cover.

[0029] The sealing gasket prevents fluid from leaking from the gap between the valve body and the valve cover. By tightly fitting between the valve body and the valve cover, the sealing gasket can effectively block the penetration of fluid and ensure the sealing performance of the valve. It covers the entire joint surface between the valve body and the valve cover, ensuring that fluid cannot leak out through any gap when the valve is closed.

[0030] The beneficial effects of the present application are:

[0031] 1. By setting the sealing structure, including the first sealing member on the valve plate and the second sealing member between the valve body and the valve cover, the sealing effect is effectively improved. The leakage points on the sealing surface are reduced, thereby improving the overall sealing performance of the valve;

[0032] 2. The close fit between the annular extension and the sealing opening allows the first sealing member to adapt to changes in fluid pressure. When the fluid pressure increases, the annular extension will be more extruded, thereby more tightly fitting on the sealing opening and maintaining the sealing effect. Conversely, when the fluid pressure decreases, the annular extension can also relax accordingly to avoid sealing failure caused by excessive extrusion;

[0033] 3. The wave-shaped design of the multiple sealing protrusions connected together makes the sealing surface more flexible and better adapts to the slight unevenness or deformation at the bottom of the sealing opening. It helps to maintain the close contact between the sealing protrusions and the bottom of the sealing opening, and even in the case of slight differences in the sealing surface, effective sealing can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural schematic view of the present utility model;

[0035] Figure 2 is Figure 1 is an enlarged view of A in

[0036] Figure 3 is a structural schematic view of the sealing structure of the present utility model;

[0037] Figure 4 is a connection schematic view of the valve plate and the sealing structure of the present utility model.

[0038] The reference signs in the drawings are: 100, valve body; 110, inlet channel; 120, outlet channel; 130, liquid inlet; 200, valve cover; 300, valve seat; 310, valve shaft; 320, rocker arm; 330, valve plate; 331, connection end; 332, sealing end; 400, first sealing member; 410, sealing ring; 420, sealing opening; 430, annular extension; 440, sealing cavity; 450, sealing protrusion; 500, second sealing member; 510, sealing gasket. DETAILED DESCRIPTION

[0039] With reference to the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art are within the scope of the present application.

[0040] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a category and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the objects before and after are in a "or" relationship.

[0041] The check valve provided by the embodiments of the present application will be described in detail below in combination with the drawings, through specific embodiments and application scenarios.

[0042] Embodiment 1:

[0043] As shown in the drawings, the present application provides a check valve, comprising: Figures 1 to 4

[0044] A valve body 100, which is internally provided with an inlet channel 110 and an outlet channel 120, and is provided at the top with a valve cover 200;

[0045] A valve seat 300, which is arranged in the valve body 100, and is hingedly connected with a valve shaft 310, the valve shaft 310 being provided with a rocker arm 320, and the rocker arm 320 being fixed with a valve plate 330;

[0046] A sealing structure, comprising a first sealing member 400 arranged on the valve plate 330 and a second sealing member 500 arranged between the valve body 100 and the valve cover 200;

[0047] Wherein, the end of the inlet channel 110 is provided with a liquid inlet 130, one end of the valve plate 330 is a connecting end 331 for connecting with the rocker, and the other end is a sealing end 332 for sealing the liquid inlet 130.

[0048] In some embodiments of the present application, as Figure 1 ​As shown, the check valve adopts the above-mentioned valve plate 330, which is hinged on the valve seat 300, so that the valve plate 330 can be flexibly and stably opened and closed to the liquid inlet 130. When the fluid flows from the flow channel 110, the valve plate 330 is automatically opened under the action of fluid pressure, allowing the fluid to flow smoothly; and when the fluid pressure decreases or reverses, the valve plate 330 is automatically closed due to gravity, effectively preventing backflow of the fluid. The sealing structure is composed of the first sealing element 400 on the valve plate 330 and the second sealing element 500 between the valve body 100 and the valve cover 200, which ensures high sealing performance of the valve in the closed state.

[0049] By setting the sealing structure, including the first sealing element 400 on the valve plate 330 and the second sealing element 500 between the valve body 100 and the valve cover 200, the sealing effect is effectively improved. The leakage points on the sealing surface are reduced, thereby improving the overall sealing performance of the valve. Through the valve shaft 310 and the rocker arm 320 structure hinged on the valve seat 300, the valve plate 330 can be stably opened and closed, reducing the valve shaking and instability caused by impact and water hammer phenomenon.

[0050] Embodiment 2:

[0051] The embodiment of the present application provides a check valve, in addition to comprising the above technical features, the check valve of the embodiment of the present application further comprises the following technical features.

[0052] As shown in the figure, Figures 2 to 4 The first sealing element 400 comprises:

[0053] The sealing ring 410 is arranged outside the valve plate 330;

[0054] The sealing port 420 is arranged on the liquid inlet 130 and in contact with the sealing ring 410;

[0055] The annular extension 430 is arranged on the outer circumferential surface of the sealing ring 410 and protrudes outward;

[0056] The annular extension 430 is in contact with the sealing port 420 and is extruded, and forms a sealing outer ring for realizing the axial sealing of the first sealing element 400.

[0057] In the embodiment of the present application, the first sealing element 400 realizes the basic sealing function through the direct contact of the sealing ring 410 and the sealing port 420. The arrangement of the annular extension 430 greatly enhances the reliability of the sealing. When the valve plate 330 is closed, the annular extension 430 is in contact with the sealing port 420 and is extruded, forming a tight sealing outer ring, which effectively prevents the fluid from leaking in the axial direction.

[0058] Meanwhile, the setting of the annular extension 430 not only enhances the sealing effect, but also improves the durability of the seal. Since it protrudes outward on the outer circumferential surface of the sealing ring 410, the sealing surface is wider, reducing the wear of the sealing ring 410, thereby prolonging the service life of the seal. The close fit between the annular extension 430 and the sealing port 420 enables the first seal 400 to adapt to changes in fluid pressure. When the fluid pressure increases, the annular extension 430 will be more extruded, thereby more closely fitting on the sealing port 420, maintaining the sealing effect. Conversely, when the fluid pressure decreases, the annular extension 430 can also relax accordingly, avoiding seal failure caused by excessive extrusion.

[0059] Moreover, the annular extension 430 is inclined outward of the sealing port 420 after being extruded, and a sealing cavity 440 is formed between the annular extension 430 and the side wall of the sealing port 420.

[0060] In some embodiments of the present application, when the annular extension 430 is inclined outward of the sealing port 420 after being extruded, it forms a sealing cavity 440 between the annular extension 430 and the side wall of the sealing port 420. The existence of this cavity makes the fluid pressure more evenly distributed on the sealing surface, reducing the damage to the sealing ring 410 caused by local high pressure, thereby enhancing the reliability and durability of the seal. Meanwhile, after the annular extension 430 is inclined outward of the sealing port 420 and forms the sealing cavity 440, it actually provides an additional support structure for the sealing surface, which helps to maintain the stability of the sealing surface, so that the sealing effect remains unchanged even in the case of fluid pressure fluctuations or temperature changes.

[0061] In addition, the formation of the sealing cavity 440 further reduces the path of fluid leakage. Even if the fluid can penetrate near the sealing surface, it must bypass the sealing cavity 440 to continue to leak, and this additional obstacle increases the difficulty of fluid leakage, thereby improving the sealing performance of the valve.

[0062] Embodiment 3:

[0063] The embodiments of the present application provide a check valve, in addition to the above technical features, the check valve of the embodiments of the present application further comprises the following technical features.

[0064] As shown in Figures 2 to 4 , the first seal 400 further comprises a sealing protrusion 450 arranged on the sealing ring 410, which is in contact with the bottom of the sealing port 420 and forms a radial seal.

[0065] In the embodiments of the present application, the sealing protrusions 450 are arranged to contact the bottom of the sealing port 420 and form a radial seal, effectively preventing fluid from leaking from the radial gap between the sealing ring 410 and the sealing port 420, further enhancing the sealing performance of the check valve. The close contact between the sealing protrusions 450 and the bottom of the sealing port 420 provides an additional sealing barrier for the valve. Even in the case of slight wear or deformation of other sealing surfaces, the sealing protrusions 450 can still maintain effective sealing effect, thereby improving the reliability of the entire sealing structure.

[0066] Further, the sealing protrusions 450 are arranged in multiple and connected to form a wave shape.

[0067] The wave-shaped design of the multiple sealing protrusions 450 makes the sealing surface more flexible and better adapts to the slight unevenness or deformation of the bottom of the sealing port 420. It helps to maintain the close contact between the sealing protrusions 450 and the bottom of the sealing port 420, and effectively seals even in the case of slight differences in the sealing surface.

[0068] At the same time, the wave-shaped sealing protrusions 450 increase the contact area between the sealing surface and the bottom of the sealing port 420, thereby improving the sealing effect. Each sealing protrusion 450 can act as an independent sealing point, and even if one or several sealing points are worn or fail, the other sealing points can still maintain effective sealing effect, enhancing the reliability of the entire sealing structure.

[0069] Embodiment 4:

[0070] The embodiments of the present application provide a check valve, in addition to the above technical features, the check valve of the embodiments of the present application further comprises the following technical features.

[0071] As shown in Figure 1 The second sealing member 500 includes a sealing gasket 510 arranged between the valve body 100 and the valve cover 200.

[0072] In the embodiments of the present application, the sealing gasket 510 can prevent fluid from leaking from the gap between the valve body 100 and the valve cover 200. By closely fitting between the valve body 100 and the valve cover 200, the sealing gasket 510 can effectively block the penetration of fluid and ensure the sealing performance of the valve. It covers the entire joint surface between the valve body 100 and the valve cover 200, ensuring that fluid cannot leak out through any gap when the valve is closed.

[0073] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the methods and apparatus of the present embodiments are not limited by the order of the steps or the sequence for performing the steps, as some steps can occur in different orders and / or concurrently with one another; for example, described methods can be performed in an order other than that described, and / or additional steps can be added, or steps can be omitted, or a combination thereof. Also, characteristics described in relation to certain examples can be combined in other examples.

[0074] The embodiments of the present application described above are merely exemplary and are not intended to limit the present application to the described embodiments. The described embodiments are merely illustrative and not restrictive of the present application. Many modifications and variations of the described embodiments are possible, all of which are intended to be within the scope of the present application.

Claims

1. A check valve, characterized in that: include: The valve body (100) has an inlet channel (110) and an outlet channel (120) inside, and a valve cover (200) is provided on its top; A valve seat (300) is disposed inside the valve body (100). A valve shaft (310) is hinged on the valve seat (300). A rocker arm (320) is disposed on the valve shaft (310). A valve plate (330) is fixed on the rocker arm (320). The sealing structure includes a first seal (400) disposed on the valve plate (330) and a second seal (500) disposed between the valve body (100) and the valve cover (200); The inlet channel (110) is provided with an inlet port (130) at its end. One end of the valve plate (330) is a connecting end (331) for connecting with the rocker arm, and the other end is a sealing end (332) for sealing the inlet port (130).

2. A check valve according to claim 1, characterized in that: The first seal (400) includes: A sealing ring (410) is disposed outside the valve plate (330); A sealing port (420) is provided on the liquid inlet (130) and contacts the sealing ring (410); An annular extension (430) is disposed on the outer circumferential surface of the sealing ring (410) and protrudes outward; The annular extension (430) is squeezed after contacting the sealing port (420) and forms a sealing outer ring that achieves axial sealing of the first sealing element (400).

3. A check valve according to claim 2, characterized in that: After being compressed, the annular extension (430) tilts outward toward the sealing opening (420), and a sealing cavity (440) is formed between the annular extension (430) and the side wall of the sealing opening (420).

4. A check valve according to claim 3, characterized in that: The first seal (400) further includes a sealing protrusion (450) disposed on the sealing ring (410), the sealing protrusion (450) contacting the bottom of the sealing port (420) and forming a radial seal.

5. A check valve according to claim 4, characterized in that: The sealing protrusions (450) are provided in multiple ways, and the multiple sealing protrusions (450) are connected to form a wave shape.

6. A check valve according to claim 5, characterized in that: The second seal (500) includes a gasket (510) disposed between the valve body (100) and the valve cover (200).

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