A one-way valve based on thread adjustment

Abstract

The utility model relates to a one-way valve based on thread adjustment, including the valve body, one end of valve body is equipped with the first air tap, the other end is equipped with the second air tap, is equipped with the valve cavity in the valve body, all are seted up in first air tap, second air tap inside the flow channel that is linked with valve cavity, the one end of valve cavity is movably equipped with the rubber plug near first air tap, the inner wall screw thread connection of valve cavity near second air tap one end has the adjusting screw plug, is equipped with the spring between adjusting screw plug and rubber plug, through the accurate control of the spring pre -tension of adjusting screw plug in the valve cavity, effectively made up the defect that the opening pressure consistency was poor, the precision was insufficient because of the individual difference of spring elasticity of traditional one-way valve, reduced the unqualified product rate, promoted batch production efficiency, can better adapt to the application scene that the opening pressure precision has strict requirement.

Description

Technical Field

[0001] This utility model relates to the field of one-way valve technology, specifically to a one-way valve based on threaded adjustment. Background Technology

[0002] As a basic component for controlling the unidirectional flow of media in fluid pipeline systems, check valves are widely used in hydraulic transmission, pneumatic control, water supply and drainage, medical devices and other fields. Their core function is to achieve "forward conduction and reverse sealing" by relying on the cooperation of internal elastic elements and seals. By setting a specific opening pressure, they ensure that the fluid flows stably under the preset pressure conditions and avoid the impact or damage to the system caused by the reverse flow of the media.

[0003] Currently, the core structure of most one-way valves on the market typically includes a valve body, a rubber plug, a spring, and a fluid interface: the valve body forms a valve cavity, the rubber plug is movably positioned on the side of the valve cavity near the fluid inlet, and the spring is correspondingly positioned on the side of the rubber plug away from the inlet, providing preload to the rubber plug to achieve reverse sealing; the fluid interfaces are located at both ends of the valve body, communicating with the valve cavity to form a flow path. However, the opening pressure of this type of one-way valve is mainly determined by the initial spring force. When the pressure on the fluid inlet side overcomes the spring preload, the rubber plug moves to achieve conduction.

[0004] In actual mass production, springs of the same specification and batch are naturally affected by factors such as fluctuations in material properties (e.g., differences in the tensile strength of steel wire), deviations in processing accuracy (e.g., errors in wire diameter, pitch, and effective number of turns), and insufficient consistency in heat treatment processes. Once assembled into the valve cavity, the spring's preload and axial position are fixed and cannot be corrected based on the actual opening pressure after assembly. This directly leads to poor consistency and insufficient precision in the opening pressure of mass-produced check valves due to individual spring differences. Products with opening pressures exceeding the acceptable range must be scrapped because they cannot be adjusted, increasing production costs and failing to meet the stringent opening pressure requirements of high-precision applications. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a one-way valve based on thread adjustment.

[0006] The objective of this utility model can be achieved through the following technical solution: a one-way valve based on threaded adjustment, comprising a valve body, a first air nozzle at one end of the valve body and a second air nozzle at the other end, a valve cavity within the valve body, and flow channels communicating with the valve cavity being opened in both the first and second air nozzles; a rubber plug is movably provided in the valve cavity near the first air nozzle, and an adjusting screw plug is threadedly connected to the inner wall of the valve cavity near the second air nozzle, with a spring provided between the adjusting screw plug and the rubber plug.

[0007] Preferably, the adjusting screw plug has a first adjusting hole, and a second adjusting hole is provided on one side of the first adjusting hole.

[0008] Preferably, the rubber stopper is provided with circumferentially spaced limiting protrusions that abut against the inner wall of the valve cavity.

[0009] Preferably, the adjusting screw and the rubber plug are respectively provided with a first guide boss and a second guide boss that match the inner ring of the spring.

[0010] Preferably, a retaining ring is provided on the second guide boss, the retaining ring including a gasket, and the outer edge of the gasket is provided with baffles at intervals.

[0011] Preferably, the end wall of the valve cavity is provided with a sealing flange on the periphery of the flow channel of the first air nozzle.

[0012] Preferably, the sealing flange has a trapezoidal structure.

[0013] Preferably, the rubber stopper is provided with a countersunk hole corresponding to the flow channel of the first air nozzle.

[0014] Preferably, anti-detachment rings are provided on the outer side of both the first and second air nozzles, and the anti-detachment rings have an outwardly expanding conical structure in the direction closer to the valve body.

[0015] Preferably, the first air nozzle is integrally formed with the valve body, and the second air nozzle is detachably connected to the valve body.

[0016] The beneficial effects of this invention are as follows: the adjusting screw in the valve cavity can flexibly adjust the spring preload. When the adjusting screw moves towards the rubber stopper, the spring is compressed, the preload increases, and the opening pressure of the one-way valve rises accordingly. When the adjusting screw moves away from the rubber stopper, the spring preload decreases, and the opening pressure decreases accordingly. This precise control of the spring preload effectively compensates for the defects of traditional one-way valves, such as poor consistency and insufficient precision in opening pressure caused by individual differences in spring force. This not only reduces the defect rate and improves batch production efficiency, but also better adapts to application scenarios with stringent requirements for opening pressure accuracy. Attached Figure Description

[0017] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a one-way valve based on threaded adjustment according to the present invention.

[0019] Figure 2 This is a cross-sectional view of a one-way valve based on threaded adjustment according to this utility model.

[0020] Figure 3 This is a schematic diagram of the adjusting screw structure of a one-way valve based on thread adjustment according to this utility model.

[0021] Figure 4 This is a schematic diagram of the rubber plug structure of a one-way valve based on threaded adjustment according to this utility model.

[0022] Figure 5 This is a schematic diagram of the retaining ring structure of a one-way valve based on threaded adjustment according to this utility model.

[0023] Figure 6 for Figure 2 A partial schematic diagram of point A in the middle.

[0024] The labels in the diagram represent: 1. Valve body; 2. First air nozzle; 3. Flow channel; 4. Second air nozzle; 5. Valve cavity; 6. Rubber plug; 7. Limiting protrusion; 8. Adjusting screw plug; 9. First adjusting hole; 10. Second adjusting hole; 11. First guide boss; 12. Spring; 13. Second guide boss; 14. Retaining ring; 15. Gasket; 16. Baffle; 17. Sealing flange; 18. Countersunk hole; 19. Anti-detachment ring. Detailed Implementation

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. 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.

[0028] See Figures 1 to 6 As shown, the structure of this utility model is as follows: a one-way valve based on threaded adjustment, including a valve body 1, a first air nozzle 2 at one end of the valve body 1, and a second air nozzle 4 at the other end. A valve cavity 5 is provided inside the valve body 1. Both the first air nozzle 2 and the second air nozzle 4 have flow channels 3 that communicate with the valve cavity 5. A rubber plug 6 is movably provided at the end of the valve cavity 5 near the first air nozzle 2. An adjusting screw plug 8 is threadedly connected to the inner wall of the valve cavity 5 near the end of the second air nozzle 4. A spring 12 is provided between the adjusting screw plug 8 and the rubber plug 6. Specifically, the valve body 1 serves as the core load-bearing structure, providing the mounting base for each component and forming the valve cavity 5 for fluid flow. The first air nozzle 2 and the second air nozzle 4 serve as fluid inlet and outlet interfaces, respectively. A complete fluid channel is constructed through the communication between the flow channels 3 and the valve cavity 5. The adjusting screw plug 8 communicates with the valve cavity 5 through the flow channels 3. The threaded connection on the inner wall of cavity 5 allows for axial position adjustment, which is used to adjust the preload of spring 12. When the adjusting screw 8 moves towards the rubber plug 6, spring 12 is compressed, the preload increases, and the opening pressure of the one-way valve increases. When the adjusting screw 8 moves away from the rubber plug 6, the preload of spring 12 decreases, and the opening pressure decreases. Under normal conditions, spring 12 pushes the rubber plug 6 towards the first air nozzle 2 through the preload, so that the rubber plug 6 seals the flow channel 3 of the first air nozzle 2. When the fluid pressure on the side of the first air nozzle 2 is greater than the preload of spring 12, spring 12 is compressed, and the fluid pushes the rubber plug 6 towards the adjusting screw 8. The fluid enters valve cavity 5 through the gap between the rubber plug 6 and the flow channel 3 of the first air nozzle 2, and then enters the flow channel 3 of the second air nozzle 4 from valve cavity 5, achieving forward conduction.

[0029] like Figure 2 , Figure 3 As shown, the adjusting screw plug 8 has a first adjusting hole 9, and a second adjusting hole 10 connected to it on one side. Specifically, both the first adjusting hole 9 and the second adjusting hole 10 are internal hexagonal through holes, and the diameter of the first adjusting hole 9 is larger than that of the second adjusting hole 10, so that it can withstand high torque during batch assembly. The diameter of the second adjusting hole 10 is smaller than that of the flow channel 3 of the second air nozzle 4. During assembly, the adjusting screw plug 8 is first tightened to a uniform depth by automated equipment or manual tools through the first adjusting hole 9. Then, after assembling the second air nozzle 4, the opening pressure is tested to screen out valves with unqualified opening pressure. For unqualified valves, a smaller tool can be inserted into the second adjusting hole 10 from the second air nozzle 4 to adjust the preload of the spring 12 a second time until the valve opening pressure is qualified. The first adjusting hole 9 and the second adjusting hole 10 are connected to each other as a channel for fluid flow, ensuring that the positive fluid can smoothly pass through the adjusting screw plug 8 and flow to the second air nozzle 4.

[0030] like Figure 4As shown, the rubber stopper 6 is provided with circumferentially spaced limiting protrusions 7 that abut against the inner wall of the valve cavity 5. Specifically, the circumferentially spaced limiting protrusions 7 of the rubber stopper 6 abut against the inner wall of the valve cavity 5, which on the one hand restricts the radial sway of the rubber stopper 6 in the valve cavity 5, ensuring that it can only move stably along the axial direction, and avoids sealing failure or flow obstruction due to skewness; on the other hand, the gap between the limiting protrusions 7 forms a fluid flow channel, providing space for the positive fluid to pass through.

[0031] like Figure 2 , Figure 3 , Figure 4 As shown, the adjusting screw plug 8 and the rubber plug 6 are respectively provided with a first guide boss 11 and a second guide boss 13 that match the inner ring of the spring 12. Specifically, the first guide boss 11 and the second guide boss are used to position the two ends of the spring 12 to ensure that the spring 12 always extends and contracts along the axial direction and avoid uneven force transmission caused by the spring 12 being skewed.

[0032] like Figure 2 , Figure 5 As shown, a retaining ring 14 is provided on the second guide boss 13. The retaining ring 14 includes a gasket 15. A baffle 16 is provided circumferentially around the outer edge of the gasket 15. Specifically, the gasket 15 is radially parallel to the spring 12 and can fully support the end of the spring 12, avoiding force transmission loss caused by the end of the spring 12 embedding into the surface of the rubber plug 6, and ensuring that the force of the spring 12 is evenly applied to the rubber plug 6. The baffles 16 provided circumferentially around the outer edge of the gasket 15 are axially parallel to the spring 12. Their inner side is clearance-fitted with the outer side of the spring 12, which can limit the radial displacement of the spring 12 during the extension and retraction process, ensuring that the spring 12 always works stably along the axial direction, and further improving the smoothness of the movement of the rubber plug 6 and the reliability of sealing and conduction.

[0033] like Figure 6 As shown, the end wall of the valve chamber 5 is provided with a sealing flange 17 on the side of the flow channel 3 of the first air nozzle 2. Specifically, when there is no positive fluid pressure or reverse pressure in the valve chamber 5, the spring 12 pushes the rubber plug 6 to move towards the first air nozzle 2, so that the end of the rubber plug 6 is tightly abutted against the sealing flange 17 to achieve a seal. When the positive fluid pressure overcomes the preload of the spring 12, the rubber plug 6 moves towards the adjusting screw plug 8, and the end of the rubber plug 6 separates from the sealing flange 17. The fluid can enter the valve chamber 5 through the gap between the two to achieve forward conduction.

[0034] Furthermore, the sealing flange 17 has a trapezoidal structure. Specifically, the side of the trapezoidal structure facing the rubber stopper 6 is narrow. The small contact area formed by the narrow side of the sealing flange 17 can convert the preload of the spring 12 into a greater sealing pressure, making the rubber stopper 6 fit more tightly with the sealing flange 17, and effectively blocking fluid leakage even under low preload.

[0035] like Figure 2 , Figure 4As shown, the rubber stopper 6 is provided with a countersunk hole 18 corresponding to the flow channel 3 of the first air nozzle 2. Specifically, the countersunk hole is adapted to the inner diameter of the flow channel 3 of the first air nozzle 2. After the fluid enters from the first connector, it can flow directly into the countersunk hole 18. When the rubber stopper 6 is pushed to move, the fluid pressure is concentrated in the countersunk hole 18, ensuring that the force point of the fluid pressure on the rubber stopper 6 is always limited to the countersunk hole range, that is, the middle position of the rubber stopper 6. This effectively prevents the rubber stopper 6 from tilting radially and the sealing surface from not fitting evenly due to force deviation, thereby avoiding the problems of reverse sealing failure or forward conduction jamming.

[0036] like Figure 1 , Figure 2 As shown, anti-detachment rings 19 are provided on the outer side of the first air nozzle 2 and the outer side of the second air nozzle 4. The anti-detachment rings 19 have an outwardly expanding conical structure in the direction close to the valve body 1. Specifically, when the external pipeline is fitted into the first air nozzle 2 and the second air nozzle 4, the outwardly expanding surface of the anti-detachment rings 19 tightly engages with the inner wall of the pipeline. By increasing the radial friction and clamping force, the pipeline is effectively prevented from falling off the joint under the impact of fluid pressure or vibration.

[0037] Furthermore, the first air nozzle 2 is integrally formed with the valve body 1, and the second air nozzle 4 is detachably connected to the valve body 1. Specifically, the integrally formed structure can eliminate connection gaps, improve sealing reliability and structural strength, and prevent leakage or detachment under high pressure fluid impact. The detachable connection between the second air nozzle 4 and the valve body 1 provides flexibility for the assembly, maintenance and functional adaptation of the check valve while ensuring sealing. During assembly, the internal components of the valve cavity 5 can be installed and debugged first, and then the second air nozzle 4 can be connected. When it is necessary to repair the internal components later, the second air nozzle 4 can be disassembled for convenient operation.

[0038] In practical use, under normal conditions, the adjusting plug 8 is fixed by engaging the internal thread of the valve cavity 5 near the second air nozzle 4 through its external thread. The side of the plug facing the rubber plug 6 abuts against one end of the spring 12, while the other end of the spring 12 tightly abuts against the rubber plug 6. At this time, the spring 12 is in a pre-compressed state, and its elastic force pushes the rubber plug 6 towards the first air nozzle 2 along the axial direction of the valve cavity 5, so that the end of the rubber plug 6 exactly fits against the outlet end of the flow channel 3 of the first air nozzle 2, completely sealing the flow channel 3 and forming a reverse seal. At this time, the flow channel 3 of the first air nozzle 2 is isolated from the valve cavity 5, and fluid cannot flow back into the first air nozzle 2 from the second air nozzle 4 through the valve cavity 5. When fluid is introduced into the first air nozzle 2, the fluid first enters the flow channel 3 of the first air nozzle 2, and the pressure gradually acts on the end face of the rubber plug 6 facing the flow channel 3. As the fluid pressure increases, when the pressure exceeds the preload of the spring 12, the rubber plug 6 overcomes the elastic force of the spring 12 under the action of the fluid thrust, moving along the axial direction of the valve cavity 5. The valve moves smoothly towards the adjusting screw 8, further compressing the spring 12. The end of the rubber plug 6 separates from the outlet end of the flow channel 3 of the first air nozzle 2, creating a gap between them. At this time, the fluid enters the valve chamber 5 through the flow channel 3 of the first air nozzle 2 through this gap, fills the valve chamber 5, and then flows into the flow channel 3 of the second air nozzle 4, finally flowing out from the second air nozzle 4, achieving forward conduction. If the opening pressure needs to be adjusted, the axial position of the adjusting screw 8 can be changed by rotating it. When the adjusting screw 8 is screwed in towards the rubber plug 6 along the thread, the distance between it and the rubber plug 6 decreases, the spring 12 is additionally compressed, and the preload increases. At this time, a greater fluid pressure is required to push the rubber plug 6 to move, and the opening pressure of the one-way valve increases. When the adjusting screw 8 is screwed out away from the rubber plug 6 along the thread, the distance between it and the rubber plug 6 increases, the compression of the spring 12 decreases, the preload decreases, and a smaller fluid pressure can push the rubber plug 6 to open, and the opening pressure decreases accordingly.

[0039] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A check valve based on thread adjustment, characterized by: The valve includes a valve body (1), one end of which is provided with a first air nozzle (2) and the other end with a second air nozzle (4). The valve body (1) is provided with a valve cavity (5). The first air nozzle (2) and the second air nozzle (4) are both provided with flow channels (3) that communicate with the valve cavity (5). A rubber plug (6) is movably provided in the valve cavity (5) near the first air nozzle (2). An adjusting screw plug (8) is threadedly connected to the inner wall of the valve cavity (5) near the second air nozzle (4). A spring (12) is provided between the adjusting screw plug (8) and the rubber plug (6).

2. The thread-adjustment-based check valve of claim 1, wherein: The adjusting screw plug (8) has a first adjusting hole (9), and a second adjusting hole (10) is provided on one side of the first adjusting hole (9).

3. The one-way valve based on threaded adjustment according to claim 1, characterized in that: The rubber plug (6) is provided with circumferentially spaced limiting protrusions (7) that abut against the inner wall of the valve cavity (5).

4. The one-way valve based on threaded adjustment according to claim 1, characterized in that: The adjusting screw (8) and the rubber plug (6) are respectively provided with a first guide boss (11) and a second guide boss (13) that match the inner ring of the spring (12).

5. The one-way valve based on threaded adjustment according to claim 4, characterized in that: The second guide boss (13) is provided with a retaining ring (14), the retaining ring (14) includes a gasket (15), and the outer edge of the gasket (15) is provided with a retaining plate (16) at intervals.

6. The one-way valve based on threaded adjustment according to claim 1, characterized in that: The end wall of the valve cavity (5) is provided with a sealing flange (17) on the periphery of the flow channel (3) of the first air nozzle (2).

7. The one-way valve based on threaded adjustment according to claim 6, characterized in that: The sealing flange (17) has a trapezoidal structure.

8. The one-way valve based on threaded adjustment according to claim 1, characterized in that: The rubber stopper (6) is provided with a countersunk hole (18) corresponding to the flow channel (3) of the first air nozzle (2).

9. The one-way valve based on threaded adjustment according to claim 1, characterized in that: Anti-detachment rings (19) are provided on the outer side of the first air nozzle (2) and the outer side of the second air nozzle (4). The anti-detachment rings (19) have an outwardly expanding conical structure in the direction close to the valve body (1).

10. The one-way valve based on threaded adjustment according to claim 1, characterized in that: The first air nozzle (2) is integrally formed with the valve body (1), and the second air nozzle (4) is detachably connected to the valve body (1).

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