Check valve

Abstract

A check valve includes a valve body and a valve plate disposed within the valve body for unidirectional fluid flow. A protrusion is located at the center of the valve plate. A rotating shaft is mounted on the valve body, and a connecting plate is mounted on the rotating shaft, with its other end fitted onto the protrusion. A fastener is mounted on the protrusion to prevent the connecting plate from detaching from it. The valve body includes an outlet cavity, and the valve plate can only open towards the outlet cavity. A limiting groove is provided within the outlet cavity to accommodate the protrusion, the connecting plate fitted onto the protrusion, and the fastener. The limiting groove is recessed into the inner wall of the outlet cavity. The beneficial effects of this invention are: by providing a limiting groove recessed into the inner wall of the outlet cavity, which accommodates the protrusion, connecting plate, and fastener, the risk of the locking head directly impacting the inner wall of the valve body during valve plate operation can be significantly reduced, thereby avoiding material wear and deformation. Simultaneously, it prevents valve plate position displacement, ensures high closing accuracy, improves sealing performance, and reduces the probability of leakage.

Description

Technical Field

[0001] This utility model relates to a valve, and more particularly to a check valve. Background Technology

[0002] Check valves, as a crucial fluid control device, are widely used in various pipeline systems. Their main function is to prevent backflow of fluid, thereby protecting equipment and maintaining stable system operation. In industries such as water supply, chemical, petroleum, and hydraulics, check valves are often installed at pump outlets, pipeline branches, or tank inlets. For example, in a water pump system, when the pump starts and generates positive fluid pressure, the valve plate is pushed open, allowing water to flow smoothly. Once the pump stops or a backflow tendency occurs, the valve plate quickly closes under gravity or the action of an internal spring, forming a sealing barrier and effectively preventing equipment damage caused by water hammer or media backflow. During use, the valve plate is usually fixed to the valve body by a hinge or shaft, allowing for flexible rotation to adapt to different flow conditions. This design ensures the reliability of unidirectional flow and plays an important role in power, construction, and manufacturing industries.

[0003] However, existing check valves have significant drawbacks, primarily due to their flawed valve body design. Specifically, the rotatable valve plate inside the valve body typically features a protruding locking head at its center for positioning during opening; however, the chamber within the valve body that mates with the open side of the valve plate lacks a corresponding limiting groove, causing the locking head to directly impact the inner wall of the valve body when the valve plate moves. This repeated impact gradually wears down the valve body material, causing damage and deformation to the inner wall. Simultaneously, the impact force causes the valve plate to shift position, affecting its closing accuracy. Over long-term use, this not only reduces sealing performance and introduces leakage risks but also leads to check valve failure due to valve plate misalignment, increasing maintenance costs and safety hazards. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a check valve that solves the problem of wear, displacement and sealing failure caused by the valve plate hitting the inner wall.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A check valve includes a valve body and a valve plate disposed within the valve body for unidirectional fluid flow. A protruding post is disposed at the center of the valve plate. A rotating shaft is disposed on the valve body. A connecting plate is disposed on the rotating shaft, and the other end of the connecting plate is sleeved on the protruding post. A fastener is disposed on the protruding post to prevent the connecting plate from detaching from the protruding post. The valve body includes an outlet cavity. The valve plate can only be opened towards the outlet cavity. A limiting groove is disposed within the outlet cavity to accommodate the protruding post, the connecting plate sleeved on the protruding post, and the fastener. The limiting groove is recessed into the inner wall of the outlet cavity.

[0006] The beneficial effects of this invention are as follows: By setting a limiting groove recessed into the inner wall of the outlet cavity, which accommodates the protruding post, connecting plate, and fasteners, the risk of the locking head directly impacting the inner wall of the valve body during valve plate operation can be significantly reduced, thereby avoiding material wear and deformation. Simultaneously, it prevents valve plate position displacement, ensures high closing accuracy, improves sealing performance, and reduces the probability of leakage. In long-term use, it reduces maintenance costs and safety hazards. Furthermore, the limiting groove increases the valve plate's openability and optimizes the efficiency of unidirectional fluid flow. As a preferred embodiment, the limiting groove is designed as a deep concave structure matching the profile of the protruding post. When the valve plate opens, the protruding post is automatically guided to slide into the bottom of the groove, avoiding any hard impact. The main body of the limiting groove is integrally formed from rigid material, and its depth covers the height of the fasteners, ensuring that the components are fully embedded and do not contact the inner wall of the valve body. As another preferred embodiment, the side wall of the limiting groove is provided with an inclined guide rail. During valve plate rotation, the protruding post smoothly moves along the guide rail to a fixed position within the groove. This guide rail is arranged parallel to the outlet cavity flow channel, reducing turbulence interference and improving operational stability.

[0007] Furthermore, the fastener is polygonal, the opening of the limiting groove is circular, and the inscribed polygon of the circle is larger than that of the fastener.

[0008] This design, with its circular opening and inscribed polygonal shape, facilitates the smooth entry of the protruding component into the limiting groove, reducing assembly resistance and preventing jamming or misalignment. This lowers installation complexity, ensures smooth valve plate movement, and the circular tolerance design compensates for manufacturing errors, improving system reliability. As a preferred option, the fastener uses a hexagonal nut structure, with the limiting groove opening diameter slightly larger than the nut's diagonal length. When the valve plate opens, the protruding component can be easily guided into the groove at any angle of rotation. The chamfered edges of the opening create a smooth entry point, reducing friction. Alternatively, the circular opening connects to a guide ring made of wear-resistant alloy. The ring's inner wall has a clearance fit with the polygonal outer edge of the fastener. When the protruding component approaches, the guide ring automatically corrects its position, ensuring the fastener slides in without contact and preventing scratches.

[0009] Furthermore, an arc-shaped transition surface is provided between the opening of the limiting groove and its main body.

[0010] The arc-shaped transition surface effectively guides the protrusion back into position upon impact and disperses the impact force, reducing stress concentration in the component and thus reducing wear and noise. This improves the smoothness of valve plate movement, extends component life, and assists in positioning accuracy. As a preferred approach, the arc-shaped transition surface is designed as a continuous, smooth curved surface that gradually tapers from the opening to the bottom of the groove. Upon impact, the curved surface converts the impact force into a tangential sliding force, propelling the protrusion towards the center of the main body. The radius of curvature of the curved surface is optimized to match the diameter of the protrusion, achieving a soft landing. As another preferred approach, the arc-shaped transition surface integrates a buffer layer covered by an elastic material (such as a rubber coating). This layer absorbs energy upon impact and assists the protrusion in repositioning through rebound force. This layer is bonded and fixed to the valve body substrate to ensure durability.

[0011] Furthermore, the fastener is a nut, and the protrusion is provided with a corresponding thread that mates with the fastener; the protrusion and the fastener are respectively provided with interlocking pin holes.

[0012] The threaded fit of the nut and the pin hole design enhance the connection strength between the fastener and the protrusion, preventing the connecting plate from coming off and improving structural stability. This ensures precise positioning of the valve plate when closed, reduces the risk of loosening, and simplifies maintenance. As a preferred method, after the nut is tightened, the pin hole of the protrusion and the nut automatically aligns, inserting a cylindrical pin to form a mechanical lock. The pin's ends are flared for fixation. The working principle is that when the valve plate moves, the pin bears the shear force, preventing the nut from rotating and loosening. As another preferred method, the pin hole is located above the threaded section of the protrusion and on the side of the nut, forming a through channel after splicing. After the pin is inserted, it is fixed by a snap ring. In this structure, under fluid pressure, the pin shares the load, maintaining connection rigidity and avoiding thread fatigue failure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the check valve according to an embodiment of the present utility model;

[0014] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0015] Figure 3 This is a disassembled view of the valve plate in an embodiment of this utility model. Detailed Implementation

[0016] This utility model embodiment provides a check valve, such as... Figure 1-3As shown: A valve body 1 is included, with a fluid flow channel formed within it. This channel includes an inlet and an outlet cavity 11, where the outlet cavity 11 controls the fluid outflow direction. A valve plate 2 is disposed inside the valve body 1 to control unidirectional fluid flow. A protrusion 21 is fixedly disposed at the center of the valve plate 2. A rotating shaft 3 is mounted on the valve body 1, located near the outlet cavity 11. One end of a connecting plate 4 is sleeved on the rotating shaft 3 and can rotate around it, while the other end of the connecting plate 4 is sleeved on the protrusion 21. A fastener 211 is provided on the protrusion 21 to prevent the connecting plate 4 from detaching from the protrusion 21. The valve plate 2 can only open towards the outlet cavity 11; that is, the valve plate 2 opens when fluid flows from the inlet to the outlet cavity 11 and closes in the reverse direction. A limiting groove 111 is recessed on the inner wall of the outlet cavity 11 to accommodate the protrusion 21, the connecting plate 4 sleeved on the protrusion 21, and the fastener 211. The setting of the limiting groove 111 increases the opening and closing angle of the valve plate 2, which on the one hand reduces the risk of the valve plate 2 hitting the inner wall of the valve body 1 when it is opened, and on the other hand prevents the valve plate 2 from shifting by constraining the position of the protrusion 21.

[0017] The fastener 211 has a polygonal structure, and the opening 1111 of the limiting groove 111 is circular. The inscribed polygonal dimension of this circle is larger than the maximum outer diameter of the fastener 211, facilitating the smooth entry of the protrusion 21 into the limiting groove 111 when the valve plate 2 is opened. An arc-shaped transition surface 1113 is provided between the opening 1111 of the limiting groove 111 and its main body 1112. The arc-shaped transition surface 1113 is used to guide the protrusion 21 to slide into the main body 1112 and return to its position when it impacts the limiting groove 111, while also reducing the impact force on the protrusion 21 through the arc surface buffer. The fastener 211 is a nut, and the protrusion 21 has a thread (not shown in the figure) machined on it to mate with the fastener 211. The protrusion 21 and the fastener 211 are respectively provided with pin holes 2112 that can be aligned and spliced. During assembly, after the fastener 211 is tightened onto the protrusion 21 by the thread (not shown in the figure), the pin hole 2112 is aligned and fixed by inserting a pin to enhance the connection strength between the fastener 211 and the protrusion 21, ensuring that the connecting plate 4 is stable and does not come out.

[0018] The working principle of this check valve is as follows: When fluid flows from the inlet to the outlet 11, the fluid pressure pushes the valve plate 2 to rotate around the shaft 3 and open. The protrusion 21 moves with the valve plate 2 and enters the limiting groove 111. The arc-shaped transition surface 1113 guides the protrusion 21 to slide smoothly into the main body 1112, limiting the maximum opening of the valve plate 2 to avoid excessive impact. At this time, the circular opening 1111 of the limiting groove 111 and its size being larger than that of the fastener 211 ensure that the protrusion 21 enters smoothly. At the same time, the polygonal fastener 211 and the limiting groove 111 structure prevent the valve plate 2 from shifting. When the fluid stops or flows in reverse, the valve plate 2 closes under the action of gravity or reverse pressure, sealing the channel to prevent backflow. The assembly method includes: first, putting one end of the connecting plate 4 on the shaft 3 and the other end on the protrusion 21, then tightening the fastener 211 to the thread line of the protrusion 21 (not shown in the figure), and finally aligning the pin hole 2112 and inserting the pin for reinforcement.

[0019] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A check valve, comprising a valve body and a valve plate disposed within the valve body for unidirectional fluid flow, wherein a protrusion is disposed at the center of the valve plate, a rotating shaft is disposed on the valve body, a connecting plate is disposed on the rotating shaft and the other end of the connecting plate is sleeved on the protrusion, and a fastener is disposed on the protrusion for preventing the connecting plate from detaching from the protrusion, characterized in that: The valve body includes an outlet cavity, and the valve plate can only be opened toward the outlet cavity. The outlet cavity is provided with a limiting groove for placing a protruding post, a connecting plate sleeved on the protruding post, and fasteners. The limiting groove is recessed into the inner wall of the outlet cavity.

2. The check valve according to claim 1, characterized in that: The fastener is polygonal, the opening of the limiting groove is circular, and the inscribed polygon of the circle is larger than the fastener.

3. The check valve according to claim 2, characterized in that: An arc-shaped transition surface is provided between the opening of the limiting groove and its main body.

4. The check valve according to claim 1, characterized in that: The fastener is a nut, and the protrusion is provided with a corresponding thread that mates with the fastener; the protrusion and the fastener are respectively provided with a pin hole that can be spliced.

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