Single disc check valve with reduced opening pressure

Abstract

This utility model belongs to the technical field of single-disc check valves and discloses a single-disc check valve that reduces opening pressure. It includes a valve body, a valve seat, and a valve disc. A connecting plate is mounted on the valve seat, and the valve disc is mounted on the valve seat via a variable-diameter spring assembly and the connecting plate. The variable-diameter spring assembly includes at least three spring segments with different wire diameters, the wire diameter of which decreases progressively along the fluid direction. Each spring segment includes a first spring segment, a second spring segment, and a third spring segment. The first spring segment is connected to the valve disc, and the wire diameter variation gradient of the variable-diameter spring assembly is from 0.2mm to 0.15mm to 0.1mm, with the length ratio of the first, second, and third spring segments being 1:1.5:2. This utility model, through the progressive elasticity design of the variable-diameter spring assembly, the low-friction structure of the conical sealing surface, and the dynamic adjustment capability of the counterweight balance chamber, can comprehensively reduce the initial opening pressure while minimizing fluid energy loss, making it suitable for a wide range of media, from low-viscosity gases to high-viscosity oils.

Description

Technical Field

[0001] This utility model relates to the field of single-disc check valve technology, and in particular to a single-disc check valve that reduces opening pressure. Background Technology

[0002] A single-disc check valve (also known as a swing check valve) relies on fluid pressure to push the valve disc (single disc structure) to rotate around the shaft to open. When the fluid flows in the opposite direction, the valve disc's own weight and back pressure cause it to close automatically, preventing backflow. A single-disc check valve that reduces the opening pressure is a specially designed check valve. Its core objective is to reduce the minimum fluid pressure required to start the valve through structural optimization.

[0003] Traditional single-disc check valves generally use a fixed-diameter spring in conjunction with the valve disc to achieve unidirectional flow obstruction, which has the following problems:

[0004] 1) Excessive opening pressure leads to increased fluid energy loss, and the existing spring wire diameter selection is limited and cannot be adapted to media of different viscosities;

[0005] 2) The valve disc oscillates severely under high flow rate conditions. Therefore, we propose a single-disc check valve to reduce the opening pressure. Utility Model Content

[0006] In view of the problems of the existing single-disc check valve, such as excessive opening pressure leading to increased fluid energy loss, limited selection of spring wire diameter which cannot be adapted to media of different viscosities, and severe valve disc oscillation under high flow rate conditions, this utility model is proposed.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A single-disc check valve with reduced opening pressure includes a valve body, a valve seat, and a valve disc. The valve seat is equipped with symmetrically arranged connecting plates, and the valve disc is installed on the valve seat via a variable diameter spring assembly and the connecting plates.

[0009] The variable diameter spring assembly includes at least three spring segments with different wire diameters, and the wire diameter of the variable diameter spring assembly decreases stepwise along the fluid direction.

[0010] The spring segment includes a first spring segment, a second spring segment, and a third spring segment. The first spring segment is connected to the valve disc, and the third spring segment is connected to the connecting plate.

[0011] As a technical solution for reducing the opening pressure of a single-disc check valve according to the present invention, the diameter variation gradient of the variable diameter spring group is from 0.2mm to 0.15mm to 0.1mm, and the length ratio of the first spring segment, the second spring segment and the third spring segment is 1:1.5:2.

[0012] As a technical solution for reducing the opening pressure of a single-disc check valve according to the present invention, the valve seat sealing surface has a conical structure with a cone angle α = 15° ± 2°, and an elastic sealing ring is embedded at the corresponding position of the valve disc.

[0013] As a technical solution for reducing the opening pressure of a single-disc check valve according to the present invention, wherein: the valve disc is sealed and installed in the sealing surface of the valve seat by the elastic sealing ring.

[0014] As a technical solution for reducing the opening pressure of a single-disc check valve according to the present invention, wherein: the valve disc is provided with a counterweight balancing chamber, and the counterweight balancing chamber is filled with an adjustable counterweight medium.

[0015] As a technical solution for reducing the opening pressure of a single-disc check valve according to the present invention, wherein: the valve disc is provided with an annular buffer cavity in the circumferential direction, the cavity of the annular buffer cavity is filled with damping silicone, and the gap between the annular buffer cavity and the inner wall of the valve body is 0.3-0.5mm.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. This utility model, through the progressive elasticity design of the variable diameter spring group, the low friction structure of the conical sealing surface, and the dynamic adjustment capability of the counterweight balance chamber, can comprehensively reduce the initial opening pressure and reduce fluid energy loss, so as to adapt to a wide range of media from low viscosity gases to high viscosity oils.

[0018] 2. This utility model, by employing the damping and vibration reduction of the annular buffer cavity and the inertial adjustment of the counterweight balance cavity in synergy, can suppress the oscillation of the valve disc under high flow velocity conditions, and at the same time avoid high-frequency impact on the sealing surface, thereby improving the reliability of the valve in the pulsating flow system and extending its service life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a half-sectional structural diagram of the present invention.

[0022] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0023] Figure 4 This is a schematic diagram of the connection structure of the valve disc, spring assembly, and valve seat of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] In the diagram: 1. Valve body; 2. Valve seat; 201. Connecting plate; 3. Valve disc; 301. Counterweight balancing chamber; 302. Annular buffer chamber; 401. First spring section; 402. Second spring section; 403. Third spring section; 5. Elastic sealing ring. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Reference Figures 1-4 A single-disc check valve with reduced opening pressure is provided. This single-disc check valve with reduced opening pressure includes a valve body 1, a valve seat 2 and a valve disc 3. A symmetrically arranged connecting plate 201 is installed on the valve seat 2, and the valve disc 3 is installed on the valve seat 2 through a variable diameter spring assembly and the connecting plate 201.

[0028] The variable diameter spring assembly includes at least three spring segments with different wire diameters. The wire diameter of the variable diameter spring assembly decreases gradually along the fluid direction. The variable diameter spring assembly uses nickel-titanium alloy wire.

[0029] The spring section includes a first spring section 401, a second spring section 402, and a third spring section 403. The first spring section 401 is connected to the valve disc 3, and the third spring section 403 is connected to the connecting plate 201. In application, by adopting progressive elastic force control, the three springs with decreasing wire diameters form a gradient stiffness. In the initial opening stage, the thinner wire diameter spring provides less resistance and significantly reduces the opening pressure. As the opening degree of the valve disc 3 increases, the thicker wire diameter spring section enhances the stiffness to avoid the impact caused by the instantaneous full opening of the valve disc 3. At the same time, the spring stiffness is dynamically adjusted with the opening degree, which can be compatible with fluids of different viscosities (such as high viscosity oils / low viscosity gases) to reduce energy loss.

[0030] Reference Figure 2 and Figure 4 The wire diameter of the variable wire diameter spring assembly varies from 0.2mm to 0.15mm to 0.1mm, and the length ratio of the first spring segment 401, the second spring segment 402, and the third spring segment 403 is 1:1.5:2. In application, the wire diameter gradient and the length ratio are designed in synergy to ensure a smooth transition of the spring force curve, avoid sudden changes in stiffness, and further reduce the risk of opening and closing oscillations.

[0031] Reference Figure 2 and Figure 3 The sealing surface of valve seat 2 has a conical structure with a cone angle α = 15° ± 2°. The valve disc 3 is fitted with an elastic sealing ring 5 at the corresponding position. The valve disc 3 is sealed and installed in the sealing surface of valve seat 2 through the elastic sealing ring 5. In application, the sealing surface with a cone angle of 15° ± 2°, together with the elastic sealing ring 5, uses fluid pressure to self-tighten and seal, reducing the static adsorption force between valve disc 3 and valve seat 2 and reducing the initial opening pressure. At the same time, the elastic sealing ring 5 compensates for machining errors and ensures zero leakage in the closed state.

[0032] Reference Figure 2 and Figure 3 The valve disc 3 is equipped with a counterweight balance chamber 301, the volume of which accounts for 30% of the total mass of the valve disc 3. The chamber wall is equipped with a removable sealing cover. The counterweight balance chamber 301 is filled with an adjustable counterweight medium. The counterweight medium is injected with liquid mercury (high pressure system) or hollow ceramic microspheres (low pressure system) according to the working conditions. The inertia of the valve disc 3 is adjusted by increasing or decreasing the filling amount to match different flow rate requirements. In application, by filling with an adjustable counterweight medium (such as metal particles / liquid), different flow rate working conditions are matched. In high pressure system, the counterweight is increased to prevent premature opening, and in low pressure system, the counterweight is reduced to reduce the opening pressure.

[0033] Reference Figure 2 and Figure 3 The valve disc 3 is provided with an annular buffer cavity 302 around its circumference. The cavity of the annular buffer cavity 302 is filled with damping silicone. The gap between the annular buffer cavity 302 and the inner wall of the valve body 1 is 0.3-0.5mm. In application, the damping silicone absorbs the oscillation energy of the valve disc 3 and forms a fluid damping layer with the 0.3-0.5mm gap, reducing the amplitude of valve disc 3 vibration under high flow rate, so as to extend the service life of the seal.

[0034] The working principle of this utility model is as follows: First, when the fluid pressure acts on the valve disc 3, the low friction design of the elastic sealing ring 5 and the conical sealing surface reduces the static friction. At this time, the third spring section 403, due to its thinnest wire diameter, undergoes elastic deformation first, and only a lower pressure is needed to start the valve disc 3 to move slightly.

[0035] Then, as the valve disc 3 opening increases, the second spring segment 402 begins to participate in the force. The wire diameter of 0.15mm provides medium stiffness to prevent sudden changes in opening. In addition, the medium in the counterweight balance chamber 301 offsets the fluid impact force through inertia, maintaining the smoothness of opening.

[0036] Finally, when the opening is at its maximum, the thick wire diameter of the first spring segment 401 dominates the stiffness, providing sufficient support to prevent the valve disc 3 from swinging excessively, and the damping silicone of the annular buffer cavity 302 absorbs high-frequency vibration energy, which, together with the gap laminar flow, reduces noise.

[0037] This utility model provides a single-disc check valve that reduces opening pressure. Through the progressive elasticity design of the variable diameter spring group, the low friction structure of the conical sealing surface, and the dynamic adjustment capability of the counterweight balance chamber 301, it can comprehensively reduce the initial opening pressure and reduce fluid energy loss, making it suitable for a wide range of media from low viscosity gases to high viscosity oils.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A single-disc check valve for reducing opening pressure, comprising a valve body (1), a valve seat (2), and a valve disc (3), characterized in that: The valve seat (2) is equipped with symmetrically arranged connecting plates (201), and the valve disc (3) is installed on the valve seat (2) through a variable diameter spring assembly and the connecting plates (201); The variable diameter spring assembly includes at least three spring segments with different wire diameters, and the wire diameter of the variable diameter spring assembly decreases stepwise along the fluid direction. The spring segment includes a first spring segment (401), a second spring segment (402), and a third spring segment (403). The first spring segment (401) is connected to the valve disc (3), and the third spring segment (403) is connected to the connecting plate (201).

2. The single-disc check valve for reducing opening pressure according to claim 1, characterized in that: The diameter variation gradient of the variable wire diameter spring assembly is from 0.2mm to 0.15mm to 0.1mm, and the length ratio of the first spring segment (401), the second spring segment (402), and the third spring segment (403) is 1:1.5:

2.

3. The single-disc check valve for reducing opening pressure according to claim 1, characterized in that: The sealing surface of the valve seat (2) has a conical structure with a cone angle α = 15° ± 2°, and the valve disc (3) is fitted with an elastic sealing ring (5) at the corresponding position.

4. The single-disc check valve for reducing opening pressure according to claim 3, characterized in that: The valve disc (3) is sealed within the sealing surface of the valve seat (2) by the elastic sealing ring (5).

5. The single-disc check valve for reducing opening pressure according to claim 1, characterized in that: The valve disc (3) is provided with a counterweight balancing chamber (301), which is filled with an adjustable counterweight medium.

6. The single-disc check valve for reducing opening pressure according to claim 1, characterized in that: The valve disc (3) is provided with an annular buffer cavity (302) in the circumferential direction. The cavity of the annular buffer cavity (302) is filled with damping silicone. The gap between the annular buffer cavity (302) and the inner wall of the valve body (1) is 0.3-0.5mm.

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