Small overflow valve

Abstract

The utility model relates to a small overflow valve which is mainly composed of a valve body, a diaphragm and an elastic reset piece, a valve plate, a pressure cavity and a medium circulation cavity are arranged in the valve body, and a valve port on the valve plate is communicated with a water inlet channel and a water outlet channel in the medium circulation cavity; the deformable diaphragm is located above the valve plate and divides the pressure cavity and the medium circulation cavity, and opening and closing of the valve port are achieved through fluid pressure of the water inlet channel. The elastic reset piece provides downward driving force for the diaphragm, and it is ensured that the valve port is closed. The overflow valve is characterized in that a valve stand is of an annular stand structure on the valve plate, the upper surface of the valve stand is flat and is provided with an arc-shaped convex ring, and the periphery of the convex ring is smaller than the valve stand to form a step. According to the design, the convex ring on the periphery of the valve port is changed into the arc shape, and compared with a traditional conical structure, fluid can be guided more smoothly, pressure transmission is uniform, fluid flowing resistance and energy loss are effectively reduced, the reaction sensitivity of the valve is greatly improved, and the valve port is opened and closed rapidly through the diaphragm.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, specifically to a small overflow valve. Background Technology

[0002] In fluid control systems, relief valves, as key components ensuring stable system pressure, are widely used in hydraulics, pneumatics, and other fields. Existing relief valves typically employ a piston-type structure, driven by the pressure difference across the piston to achieve automatic regulation and control of fluid pressure. Specifically, the piston divides the valve body into an inlet channel and an outlet channel. When the pressure in the inlet channel exceeds a set value, the piston overcomes the spring force and deforms towards the outlet channel, causing fluid to flow from the inlet channel to the outlet channel, thereby reducing the system pressure.

[0003] However, the traditional conical structure of the relief valve orifice has gradually revealed its shortcomings in practical applications. When the conical structure interacts with the fluid, the pressure distribution is prone to unevenness, resulting in a lag in the piston's force response. When the system pressure changes abruptly and the relief valve needs to act quickly to relieve pressure, the conical valve orifice has limited efficiency in guiding the fluid and driving the piston. This makes it difficult for the valve's action response speed to meet the requirements of high-precision, high-response fluid control systems, affecting the timeliness and stability of system pressure regulation. This limits its further application in scenarios with stringent pressure control requirements (such as precision hydraulic servo systems and high-speed pneumatic actuators). Therefore, optimizing and improving the relief valve orifice structure is of urgent practical significance. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the prior art. This utility model provides a small overflow valve, which designs the convex ring on the outer periphery of the valve port as an arc shape, which can guide the fluid flow more smoothly, and the diaphragm can quickly open and close the valve port.

[0005] The technical solution of this utility model: a small overflow valve, comprising:

[0006] The valve body has a valve plate, a pressure chamber and a medium flow chamber inside. The valve plate has a valve port and the medium flow chamber includes an inlet channel and an outlet channel connected by the valve port.

[0007] A deformable diaphragm is located above the valve plate and is used to separate the upper pressure chamber and the lower medium flow chamber. The diaphragm is used to open and close the lower valve port. The fluid pressure in the water inlet channel can drive the sealing diaphragm to extend and retract upward to open the valve port.

[0008] The elastic reset element provides a downward driving force to the diaphragm to close the valve port;

[0009] The valve plate has an upwardly protruding valve platform, and the valve port is formed inside the valve platform. The valve platform has an annular structure, and the upper surface of the valve platform is flat. A convex ring is provided on the valve platform, and the surface of the convex ring is arc-shaped. The outer circumference of the convex ring is smaller than that of the valve platform, forming a step shape.

[0010] By adopting the above technical solution, the convex ring on the outer periphery of the valve port is designed as an arc shape. Compared with the traditional conical structure, when the fluid passes through the valve port, the arc-shaped convex ring can guide the fluid flow more smoothly. This makes the pressure transmission more direct and uniform, effectively reducing fluid flow resistance and pressure loss, and reducing energy loss during fluid flow. At the same time, it significantly improves the valve's responsiveness, enabling the diaphragm to quickly open and close the valve port, achieving more precise and efficient pressure stability control, and adapting to industrial application scenarios with higher performance requirements.

[0011] A further feature of this invention is that the diaphragm includes a central displacement portion and a mounting portion surrounding its outer periphery. The displacement portion and the mounting portion are connected by an arc-shaped bend. The diaphragm displacement portion is used to open and close the lower valve port. The mounting portion is pressed against the valve plate by a pressure seat. The elastic reset member is abutted against the diaphragm displacement portion by a lower spring seat. The upward movement of the lower spring seat is limited by the limiting structure of the pressure seat.

[0012] With the above-mentioned further configuration, the diaphragm adopts a structural design consisting of a central displacement section, a mounting section surrounding the outer periphery, and a curved section with an arc transition. The curved section with an arc transition makes the diaphragm more flexible when deformed under stress, resulting in a more uniform stress distribution and reducing the likelihood of stress concentration that could damage the diaphragm, thus extending its service life. The mounting section is pressed against the valve plate by a pressure seat, ensuring the stability of the diaphragm installation. The elastic reset element forms abutment with the diaphragm displacement section through a lower spring seat, and the upward movement of the lower spring seat is limited by the limiting structure of the pressure seat, effectively restricting the displacement of the diaphragm and preventing excessive deformation and damage. At the same time, it ensures the accuracy and stability of the relief valve's operation during opening and closing.

[0013] A further feature of this invention is that the limiting structure is a raised edge on the inner ring of the pressure seat, which abuts against the lower spring seat through the lower end face of the raised edge, thereby restricting the upward movement of the lower spring seat.

[0014] With the above-mentioned further configuration, the protruding edge on the inner ring of the pressure seat serves as a limiting structure, which is simple in structure and easy to manufacture. By forming an abutment with the lower end face of the protruding edge and the lower spring seat, the upward movement of the lower spring seat is restricted. This limiting method can accurately control the movement range of the lower spring seat, thereby accurately controlling the displacement of the diaphragm, ensuring that the relief valve opens and closes accurately under the set pressure, and improving the reliability and stability of the relief valve operation.

[0015] Further features of this invention: The valve body includes a valve cap and a valve seat. The valve cap and the valve seat are detachably connected or ultrasonically welded. The valve plate, the inlet channel, and the outlet channel are disposed within the valve seat. The outer periphery of the upper surface of the valve plate has an annular groove. The outer edge of the mounting part has a downwardly bent folded edge. The folded edge is inserted into the annular groove and pressed against the pressure seat. The lower end of the valve cap is inserted into the valve seat and pressed against the pressure seat.

[0016] With the above-mentioned further design, the valve body adopts a detachable connection between the valve cap and the valve seat or ultrasonic welding. The detachable connection facilitates the installation, maintenance, and repair of the relief valve, while ultrasonic welding can ensure the strength and sealing of the connection and prevent fluid leakage. The annular groove on the outer periphery of the upper surface of the valve plate matches the folded edge bent downward on the outer edge of the diaphragm mounting part, and is then pressed by the pressure seat. This structural design further enhances the stability and sealing of the diaphragm installation. The lower end of the valve cap is inserted into the valve seat and pressed against the pressure seat, making the entire valve body structure compact, enhancing the overall strength and sealing of the valve body, and reducing the risk of fluid leakage inside the valve body.

[0017] A further feature of this invention is that the elastic reset element is a spring element, which is disposed in the pressure chamber; a pressure adjusting rod is threadedly connected to the top of the pressure chamber, the upper end of the pressure adjusting rod is exposed outside the valve body to form an adjusting end, and the lower end abuts against the upper spring seat. The upper spring seat is in contact with the upper end of the spring element, and when the pressure adjusting rod is turned, it pushes the upper spring seat to change the amount of compression on the spring element.

[0018] With the above-mentioned further configuration, the elastic reset component is a spring component. Spring components have advantages such as stable elasticity, reliable performance, and low cost, and are suitable for pressure control of small relief valves. The pressure chamber is threadedly connected to the pressure adjusting rod at the top. By turning the pressure adjusting rod, the compression of the spring component is changed by pushing the upper spring seat, thereby making it convenient and quick to adjust the spring force, and thus achieving precise adjustment of the relief valve opening pressure. This allows the relief valve to adapt to the pressure control requirements under different working conditions, improving the versatility and applicability of the relief valve. Attached Figure Description

[0019] Figure 1 This is an internal structural diagram of a specific embodiment of the present utility model;

[0020] Figure 2 This is a diagram showing the internal structure of the valve seat in a specific embodiment of this utility model;

[0021] Figure 3 This is a structural diagram of the valve port in a specific embodiment of the present utility model;

[0022] Figure 4 This is a diagram showing the fit between the pressure seat, diaphragm, and lower spring seat in a specific embodiment of this utility model.

[0023] Figure 5 This is an exploded view of a specific embodiment of the present utility model;

[0024] Figure 6 This is a structural diagram of the valve seat in a specific embodiment of the present utility model.

[0025] In the diagram: valve body 1, valve plate 11, valve port 111, valve platform 112, convex ring 113, annular groove 114, water inlet 115, pressure chamber 12, medium flow chamber 13, water inlet channel 131, water outlet channel 132, valve cap 16, valve seat 17, diaphragm 2, displacement part 21, mounting part 22, folded edge 221, bending part 23, elastic reset part 3, pressure seat 4, convex edge 41, lower spring seat 5, pressure adjusting rod 6, upper spring seat 7. Detailed Implementation

[0026] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] like Figure 1-6 As shown, an overflow valve of this utility model includes:

[0028] The valve body 1 has a valve plate 11, a pressure chamber 12 and a medium flow chamber 13 inside. The valve plate 11 has a valve port 111. The medium flow chamber 13 includes an inlet channel 131 and an outlet channel 132 connected by the valve port 111. Specifically, the lower end of the valve port is connected to the outlet channel 132 and the upper end is connected to the inlet channel 131 through a water inlet 115 on the valve plate 11.

[0029] A deformable diaphragm 2 is located above the valve plate 11 and is used to separate the upper pressure chamber 12 and the lower medium flow chamber 13. The diaphragm 2 is used to open and close the lower valve port 111. The fluid pressure in the water inlet channel 131 can drive the sealing diaphragm 2 to move upward to open the valve port 111.

[0030] The elastic reset member 3 provides a downward driving force to the diaphragm 2 to close the valve port 111;

[0031] The valve plate 11 is provided with an upwardly protruding valve platform 112. The valve port 111 is formed inside the valve platform 112. The valve platform 112 has an annular structure and the upper surface of the valve platform 112 is flat. A convex ring 113 is provided on the valve platform 112, and the surface of the convex ring 113 is arc-shaped. The outer circumference of the convex ring 113 is smaller than that of the valve platform 112, forming a step shape.

[0032] Specifically, the diaphragm 2 includes a central displacement portion 21 and a mounting portion 22 surrounding its outer periphery. The displacement portion and the mounting portion are integrally connected by an arc-shaped bending portion 23. The diaphragm displacement portion 21 is used to open and close the lower valve port 111. The mounting portion 22 is pressed against the valve plate 11 by a pressure seat 4. The elastic reset member 3 is abutted against the diaphragm displacement portion 21 by a lower spring seat 5. The upward movement of the lower spring seat 5 is limited by the limiting structure of the pressure seat 4. The limiting structure is a protruding edge 41 integrally provided on the inner ring of the pressure seat 4. The lower end face of the protruding edge 41 abuts against the lower spring seat 5, thereby limiting the upward movement of the lower spring seat 5. The valve body 1 includes a valve cap 16 and a valve seat 17. The valve cap 16 and the valve seat 17 are detachably connected or ultrasonically welded. The valve plate 11, the inlet channel 131, and the outlet channel 132 are disposed within the valve seat 17. The outer periphery of the upper surface of the valve plate 11 has an annular groove 114. The outer edge of the mounting part 22 has a downwardly bent flange 221. The flange 221 is inserted into the annular groove 114 and pressed against the pressure seat 4. The lower end of the valve cap 16 is inserted into the valve seat 17 and pressed against the pressure seat 4. The elastic reset member 3 is a spring member disposed within the pressure chamber 12. The top of the pressure chamber 12 is threadedly connected to a pressure adjusting rod 6. The upper end of the pressure adjusting rod 6 is exposed outside the valve body 1 to form an adjusting end, and the lower end abuts against the upper spring seat 7. The upper spring seat 7 contacts and engages with the upper end of the spring member. When the pressure adjusting rod 6 is turned, it pushes the upper spring seat 7 to change the compression of the spring member. The two ends of the elastic reset member 3 abut against the upper spring seat and the lower spring seat respectively, and a guide post is provided on the spring seat, with the spring member sleeved on the guide post. The elastic reset member 3 can also be a tension spring or an elastic rubber member.

[0033] The working principle of this utility model is as follows:

[0034] When fluid flows into valve body 1 through inlet channel 131, the fluid pressure acts on diaphragm 2 located above valve plate 11. As the fluid pressure in inlet channel 131 gradually increases, when the pressure exceeds the pressure value set by elastic reset member 3, the upward thrust generated by the fluid pressure on the displacement part 21 in the middle of diaphragm 2 is sufficient to overcome the elastic force of elastic reset member 3. At this time, diaphragm 2 moves upward, valve port 111 is opened, and fluid flows from inlet channel 131 through valve port 111 to outlet channel 132, realizing overflow pressure relief and thus reducing system pressure. At the same time, the lower spring seat 5 abuts against the protruding edge 41 of the inner ring of pressure seat 4, which can effectively limit the upward movement of diaphragm 2 and prevent excessive deformation of diaphragm.

[0035] In this process, the raised ring 113 on the upper surface of the valve seat 112 plays an important role. Since the surface of the raised ring 113 is arc-shaped, when the fluid flows through the valve port 111, the arc-shaped raised ring 113 can guide the fluid flow more smoothly, making the pressure transmission more direct and uniform, effectively reducing the fluid flow resistance and pressure loss. This allows the diaphragm 2 to overcome the spring force more quickly under the action of pressure difference, significantly improving the responsiveness of the relief valve.

[0036] In addition, by turning the pressure regulating rod 6 at the top of the pressure chamber 12, the upper spring seat 7 can be pushed to change the compression of the spring elastic reset member 3. The change in spring compression corresponds to the adjustment of the relief valve opening pressure, so that the opening pressure of the relief valve can be flexibly set according to the actual working conditions, thereby achieving precise adjustment and stable control of the fluid control system pressure.

[0037] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A small relief valve, characterized in that, include: The valve body (1) has a valve plate (11), a pressure chamber (12) and a medium flow chamber (13) inside. The valve plate (11) has a valve port (111) and the medium flow chamber (13) includes an inlet channel (131) and an outlet channel (132) connected by the valve port (111). A deformable diaphragm (2) is located above the valve plate (11) and is used to separate the upper pressure chamber (12) and the lower medium flow chamber (13). The diaphragm (2) is used to open and close the lower valve port (111). The fluid pressure in the water inlet channel (131) can drive the sealing diaphragm (2) to extend and retract upward to open the valve port (111). The elastic reset member (3) provides a downward driving force to the diaphragm (2) to close the valve port (111). The valve plate (11) is provided with an upwardly protruding valve platform (112), and the valve port (111) is formed inside the valve platform (112). The valve platform (112) has an annular structure, and the upper surface of the valve platform (112) is flat. A convex ring (113) is provided on the valve platform (112), and the surface of the convex ring (113) is arc-shaped. The outer circumference of the convex ring (113) is smaller than that of the valve platform (112), forming a step shape.

2. The miniature overflow valve according to claim 1, characterized in that, The diaphragm (2) includes a displacement part (21) in the middle and a mounting part (22) around its outer periphery. The displacement part and the mounting part are connected by a curved part (23) with an arc transition. The diaphragm displacement part (21) is used to open and close the lower valve port (111). The mounting part (22) is pressed against the valve plate (11) by a pressure seat (4). The elastic reset member (3) is abutted against the diaphragm displacement part (21) by a lower spring seat (5). The upward movement of the lower spring seat (5) is limited by the limiting structure of the pressure seat (4).

3. The miniature overflow valve according to claim 2, characterized in that, The limiting structure is a raised edge (41) on the inner ring of the pressure seat (4), which abuts against the lower spring seat (5) through the lower end face of the raised edge (41), thereby restricting the upward movement of the lower spring seat (5).

4. The miniature overflow valve according to claim 2, characterized in that, The valve body (1) includes a valve cap (16) and a valve seat (17). The valve cap (16) and the valve seat (17) are detachably connected or ultrasonically welded. The valve plate (11), the water inlet channel (131) and the water outlet channel (132) are arranged in the valve seat (17). The outer periphery of the upper surface of the valve plate (11) has an annular groove (114). The outer edge of the mounting part (22) has a downwardly bent flange (221). The flange (221) is inserted into the annular groove (114) and pressed by the pressure seat (4). The lower end of the valve cap (16) is inserted into the valve seat (17) and pressed against the pressure seat (4).

5. The miniature relief valve according to any one of claims 1-4, characterized in that, The elastic reset component (3) is a spring component, which is located in the pressure chamber (12). The top of the pressure chamber (12) is threaded with a pressure adjusting rod (6). The upper end of the pressure adjusting rod (6) is exposed outside the valve body (1) to form an adjusting end, and the lower end abuts against the upper spring seat (7). The upper spring seat (7) is in contact with the upper end of the spring component. When the pressure adjusting rod (6) is turned, it pushes the upper spring seat (7) to change the compression of the spring component.

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