Pneumatic control valve with directional flow difference

Abstract

The invention discloses a pneumatic control valve with directional flow difference. The pneumatic control valve comprises a valve body internally provided with a fluid channel, a clamp spring fixed in the fluid channel, a first spring located below the clamp spring and a gasket movably arranged between the clamp spring and the first spring, wherein the bottom end of the first spring abuts against the valve body. A through hole is formed in the gasket, and the first spring applies elastic force towards the clamping spring to the gasket. When airflow flows from top to bottom, airflow pressure overcomes elastic force to drive the gasket to move downwards and break away from the clamping spring, the through hole is in a conducting state, and large flow is achieved. When airflow flows from bottom to top, airflow pressure drives the gasket to move upwards and be tightly attached to the clamping spring, the clamping spring shields part of the through holes in the gasket, and small flow is achieved. According to the pneumatic control valve with the directional flow difference, directional flow difference control can be automatically achieved when fluid is conducted in two directions.

Description

Technical Field

[0001] This invention relates to the field of pneumatic valve technology, and more particularly to a pneumatic valve with directional flow difference. Background Technology

[0002] Pneumatic valves are widely used in various pneumatic systems. In certain applications, pneumatic valves need to automatically exhibit different flow characteristics based on the direction of airflow. For example, a larger flow area is required for forward flow to achieve rapid exhaust or inflation, while a smaller flow area is required for reverse flow to achieve throttling, buffering, or smooth control.

[0003] However, traditional check valves typically only allow unidirectional flow and complete reversal shut-off, failing to meet the requirement of bidirectional flow with varying flow rates. Meanwhile, conventional throttling valves or bidirectional valves often produce the same throttling effect on both airflow directions, unable to automatically adjust their effective flow area based on changes in fluid direction. Using complex electrically controlled proportional valves or multi-valve combination circuits to achieve these functions results in a bloated system structure, high costs, and increased failure rates.

[0004] Therefore, how to design a pneumatically controlled valve with a simple structure that can achieve bidirectional flow entirely by relying on mechanical structure and airflow pressure, and automatically generate differences in flow rate under different flow directions, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a pneumatically controlled valve with directional flow difference to solve the technical problem that traditional one-way valves can only achieve unidirectional flow and complete reverse cut-off of fluid, and cannot meet the requirements of bidirectional conduction and flow difference.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a pneumatically controlled valve with directional flow difference, wherein the pneumatically controlled valve with directional flow difference includes... Valve body, wherein a fluid passage is provided inside the valve body; A retaining ring is fixedly disposed within the fluid passage of the valve body; A first spring is disposed within the fluid channel and located below the retaining ring, with its bottom end abutting against the valve body. A washer is movably disposed between the retaining ring and the first spring. The washer has a through hole. The top end of the first spring abuts against the washer and applies a spring force toward the retaining ring to the washer. When the airflow flows from top to bottom, the pressure of the airflow overcomes the elastic force of the first spring, driving the pad to move downward and disengage from the retaining spring, and the through hole is in a conductive state; when the airflow flows from bottom to top, the pressure of the airflow drives the pad to move upward and press against the retaining spring, and the retaining spring blocks part of the through hole on the pad.

[0007] In one embodiment, the through-hole on the gasket has a funnel-shaped cross-section that is smaller at the top and larger at the bottom.

[0008] In one embodiment, the inner wall of the fluid channel is provided with a first groove, and the edge of the gasket slides into the first groove.

[0009] In one embodiment, a mounting groove is provided on the outer periphery of the upper surface of the gasket, and an annular permanent magnet is installed in the mounting groove, the permanent magnet being magnetically attracted to the snap ring.

[0010] In one embodiment, the system further includes an intelligent status monitoring feedback unit, which includes a Hall sensor embedded in the outer wall of the valve body, the Hall sensor being close to the retaining ring.

[0011] In one embodiment, an overload protection unit is further included, the overload protection unit being disposed on the gasket, the overload protection unit comprising: Sub-gasket, wherein the sub-gasket has an inverted frustum-shaped structure, and a central hole adapted to the sub-gasket is provided in the middle of the gasket; Mounting bracket, the mounting bracket being disposed on the bottom surface of the gasket; A second spring, one end of which is fixed to the mounting bracket, and the other end of which is connected to the sub-waist; The second spring pulls the sub-waistlet tightly so that the sub-waistlet tightly adheres to and seals the central hole.

[0012] In one embodiment, a preload adjustment unit is further included, the preload adjustment unit being used to adjust the preload of the first spring, the preload adjustment unit comprising: The second slide groove is disposed in the fluid passage of the valve body and is located below the first spring; A preload ring is slidably disposed within the second groove, with the top of the preload ring abutting against the end of the first spring; An adjusting airbag is located within the second sliding groove and below the pre-tightening ring. The bottom of the adjusting airbag is connected to an air pressure system via an air tube.

[0013] In one embodiment, the lower end of the fluid passage of the valve body protrudes upward to form a limiting step, which is used to limit the maximum distance that the gasket can slide downward.

[0014] In one embodiment, the through holes on the gasket include multiple sets, and each set of through holes is arranged in a circular array with the center of the gasket as the center; the retaining ring is a solid ring with a certain radial width, and the radius of the distribution circle of the through holes coincides with the radius of the solid ring of the retaining ring; when the gasket is in close contact with the retaining ring, the bottom surface of the retaining ring closes part of the opening area of ​​the through holes.

[0015] In one embodiment, the bottom surface of the gasket is provided with a plurality of radially distributed drainage grooves, one end of which extends to the outer edge of the gasket, and the other end of which is connected to the lower port of the through hole, for guiding reverse airflow and generating a purge vortex at the through hole.

[0016] The above-described technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: The pneumatically controlled valve with directional flow difference provided in this invention allows for high flow rates when airflow is from top to bottom. The airflow pressure drives the gasket downwards, disengaging it from the retaining ring and fully opening the through-hole. When airflow is from bottom to top, the gasket adheres tightly to the retaining ring, which blocks some of the holes in the gasket, reducing the effective flow area and achieving a lower flow rate. This pneumatically controlled valve integrates stable and reliable directional flow difference control within a single valve body. Furthermore, through structures such as permanent magnets, guide grooves, and overload protection in subsequent embodiments, it further eliminates chattering under critical conditions, achieving "fast opening and fast closing," significantly improving the overall safety and integration of the pneumatic circuit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a pneumatically controlled valve with directional flow difference provided in an embodiment of the present invention; Figure 2 A cross-sectional view of a pneumatically controlled valve with directional flow difference provided in the first embodiment of the present invention when the airflow flows from bottom to top; Figure 3 A cross-sectional view of a pneumatically controlled valve with directional flow difference provided in the first embodiment of the present invention when the airflow is flowing from top to bottom; Figure 4 A cross-sectional view of a pneumatically controlled valve with directional flow difference provided in the second embodiment of the present invention when the airflow is flowing from top to bottom; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 for Figure 4 A magnified view of a section at point B in the middle; Figure 7 for Figure 4 A magnified view of a section at point C; Figure 8 A cross-sectional view of the pneumatically controlled valve with directional flow difference provided in the second embodiment of the present invention when flowing from bottom to top; Figure 9 A cross-sectional view of a pneumatically controlled valve with directional flow difference in overload protection according to the second embodiment of the present invention; Figure 10 for Figure 8 A cross-sectional view of the preload adjustment section after adjustment.

[0019] The labels for the various figures are as follows: 1. Valve body; 2. Snap ring; 3. First spring; 4. Gasket; 5. Permanent magnet; 6. Hall sensor; 7. Overload protection unit; 8. Preload adjustment unit; 11. Fluid channel; 12. Limiting step; 41. Through hole; 42. Center hole; 71. Sub-gasket; 72. Mounting bracket; 73. Second spring; 81. Second slide groove; 82. Preload ring; 83. Adjusting air bladder; 111. First slide groove. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection or an electrical connection; 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 invention according to the specific circumstances.

[0024] Please see Figures 1 to 3 This application provides a pneumatically controlled valve with directional flow difference, including a valve body 1, a retaining ring 2, a first spring 3, and a gasket 4. The valve body 1 has an internal fluid channel 11; the retaining ring 2 is fixedly disposed within the fluid channel 11 of the valve body 1; the first spring 3 is disposed within the fluid channel 11 and located below the retaining ring 2, with its bottom end abutting against the valve body 1; the gasket 4 is movably disposed between the retaining ring 2 and the first spring 3, and the gasket 4 has a through hole 41. The top end of the first spring 3 abuts against the gasket 4 and applies a spring force towards the retaining ring 2 to the gasket 4.

[0025] The specific working principle of this pneumatically controlled valve to achieve directional flow difference is as follows: When the airflow flows from top to bottom, the airflow will give the gasket 4 a downward gas pressure, causing the gasket 4 to overcome the elastic force of the first spring 3 and move downward, so that the gasket 4 disengages from the retaining ring 2, thereby preventing the through hole 41 on the gasket 4 from being blocked by the gasket (e.g., Figure 3 As shown), this results in a large flow rate when the airflow moves from top to bottom. When the airflow moves from bottom to top, the air pressure exerted on the gasket 4 is upward, causing the gasket 4 to press tightly against the retaining spring 2, resulting in some holes on the gasket 4 being blocked by the retaining spring 2 (as shown). Figure 2 As shown in the figure, this results in a smaller effective flow area for gasket 4, which in turn leads to a smaller flow rate when the airflow moves from bottom to top.

[0026] In one embodiment, the cross-section of the through hole 41 on the gasket 4 is designed as a "flare" or "Venturi tube" shape, with the top smaller than the bottom. The flare design allows any particles entering the hole to be discharged smoothly without getting stuck; the spiral guide groove allows the passing airflow to generate a weak vortex, using fluid dynamics to automatically blow away the deposits on the gasket surface, achieving self-cleaning.

[0027] In one embodiment, to address the issue that the gasket 4, supported only by the conical spring at its bottom, is prone to tilting during its up-and-down movement when the airflow velocity is uneven or there is airflow disturbance, causing the gasket edge to jam against the valve body wall or resulting in a poor fit with the retaining spring 2, a first groove 111 is provided on the inner wall of the fluid channel 11, and the edge of the gasket 4 is slidably fitted into the first groove 111. This sliding fit between the gasket 4 and the first groove 111 provides guidance, ensuring that the gasket 4 always maintains strict axial movement, solving the jamming problem caused by uneven spring force, and improving the valve's service life and response consistency in harsh pneumatic environments. Furthermore, it prevents the gasket from rotating freely under airflow impact, thus avoiding random changes in the area of ​​the blocked orifice and ensuring stable values ​​for "low flow rates."

[0028] In one embodiment, an mounting groove is provided on the outer periphery of the upper surface of the gasket 4, and a ring-shaped permanent magnet 5 is installed in the mounting groove. The permanent magnet 5 magnetically engages with the retaining spring 2. This is intended to solve the problem of high-frequency flutter caused by the gasket 4 being in a "half-open, half-closed" suspended state when the airflow thrust and spring force are exactly balanced under critical air pressure. By setting the permanent magnet 5 and magnetically engaging with the retaining spring 2, when the gasket 4 approaches the retaining spring 2, the magnetic attraction force increases sharply, forcing the gasket 4 to instantly engage; when the reverse airflow thrust is large enough, once the magnetic force threshold is broken, the gasket 4 instantly disengages. This eliminates the flutter phenomenon under critical conditions, realizes "fast opening and fast closing" of the valve, greatly extends the fatigue life of the mechanical structure, and makes the boundary of flow switching clearer and crisper. In addition, when the gasket 4 instantly and quickly engages with the retaining spring 2, a large impact is generated between the two, allowing foreign objects on the gasket to fall off the gasket under the impact force, avoiding the accumulation of foreign objects and blocking the through hole, thus achieving a self-cleaning effect.

[0029] In one embodiment, such as Figure 5 As shown, the present invention also includes an intelligent status monitoring feedback unit, which includes a Hall sensor 6 embedded in the outer wall of the valve body 1 near the retaining ring 2. When the gasket 4 moves up and down, the position of the annular permanent magnet 5 on it changes, and the Hall sensor 6 outputs high and low level signals, realizing the "self-sensing" capability of the purely mechanical pneumatic control valve. The real-time position of the valve core (gasket) can be accurately obtained without contact with the fluid medium.

[0030] In one embodiment, the invention further includes an overload protection part 7, which is disposed on the gasket 4. The overload protection part 7 includes a sub-gasket 71 with an inverted frustum-shaped structure, and a central hole 42 adapted to the sub-gasket 71 is opened in the middle of the gasket 4; a mounting bracket 72 is disposed on the bottom surface of the gasket 4; one end of a second spring 73 is fixed to the mounting bracket 72, and the other end is connected to the sub-gasket 71. The second spring 73 pulls the sub-gasket 71 so that the sub-gasket 71 is tightly attached to and closes the central hole 42. Under normal reverse (from bottom to top) low flow conditions, the gasket 4 is in contact with the retaining spring 2, and gas flows through the through hole 41 on the gasket 4; when encountering extreme high pressure, the central second spring 73 is stretched, and the sub-gasket 71 is pushed open, forming a high-flow emergency pressure relief channel (i.e., the central hole 42 of the gasket 4, such as...). Figure 9 (As shown). Furthermore, it integrates both "one-way throttling" and "safety overflow" functions within a single valve body, significantly improving the overall safety and integration of the pneumatic circuit.

[0031] In one embodiment, the present invention further includes a preload adjustment unit 8 for adjusting the preload of the first spring 3. The preload adjustment unit 8 includes a second slide groove 81 disposed within the fluid channel of the valve body and located below the first spring 3; a preload ring 82 slidably disposed within the second slide groove 81 and with its top abutting against the end of the first spring 3; and an adjustment airbag 83 located within the second slide groove 81 below the preload ring 82. The bottom of the adjustment airbag 83 is connected to a pneumatic system via an air pipe. Different pressures of air are injected into the adjustment airbag 83 through the pneumatic system, causing the adjustment airbag 83 to expand and push upwards against the preload ring 82, thereby compressing the first spring 3 and increasing the preload force exerted by the first spring 3 on the gasket 4 (e.g., ...). Figure 10 As shown), this allows for changing the opening of the gasket (as shown). Figure 4 The critical air pressure (the air pressure required at the time shown). In addition, when the regulating airbag 83 inflates, the outer side of the airbag is in close contact with the wall of the second slide groove 81, thereby ensuring sealing performance and preventing leakage from the valve from the pre-tightening adjustment part 8.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pneumatically controlled valve with directional flow difference, characterized in that, The pneumatically controlled valve with directional flow difference includes: Valve body, wherein a fluid passage is provided inside the valve body; A retaining ring is fixedly disposed within the fluid passage of the valve body; A first spring is disposed within the fluid channel and located below the retaining ring, with its bottom end abutting against the valve body. A washer is movably disposed between the retaining ring and the first spring. The washer has a through hole. The top end of the first spring abuts against the washer and applies a spring force toward the retaining ring to the washer. When the airflow flows from top to bottom, the pressure of the airflow overcomes the elastic force of the first spring, driving the pad to move downward and disengage from the retaining spring, and the through hole is in a conductive state; when the airflow flows from bottom to top, the pressure of the airflow drives the pad to move upward and press against the retaining spring, and the retaining spring blocks part of the through hole on the pad.

2. The pneumatically controlled valve with directional flow difference according to claim 1, characterized in that: The through-hole on the gasket has a funnel-shaped cross-section that is smaller at the top and larger at the bottom.

3. A pneumatically controlled valve with directional flow difference according to claim 1, characterized in that: The inner wall of the fluid channel is provided with a first groove, and the edge of the gasket slides within the first groove.

4. A pneumatically controlled valve with directional flow difference according to claim 1, characterized in that: The upper surface of the gasket is provided with a mounting groove, and an annular permanent magnet is installed in the mounting groove. The permanent magnet is magnetically attracted to the snap ring.

5. A pneumatically controlled valve with directional flow difference according to claim 4, characterized in that: It also includes an intelligent status monitoring feedback unit, which includes a Hall sensor embedded in the outer wall of the valve body, the Hall sensor being close to the retaining ring.

6. A pneumatically controlled valve with directional flow difference according to claim 1, characterized in that, It also includes an overload protection unit disposed on the gasket, the overload protection unit comprising: Sub-gasket, wherein the sub-gasket has an inverted frustum-shaped structure, and a central hole adapted to the sub-gasket is provided in the middle of the gasket; Mounting bracket, the mounting bracket being disposed on the bottom surface of the gasket; A second spring, one end of which is fixed to the mounting bracket, and the other end of which is connected to the sub-waist; The second spring pulls the sub-waistlet tightly so that the sub-waistlet tightly adheres to and seals the central hole.

7. A pneumatically controlled valve with directional flow difference according to claim 1, characterized in that, It also includes a preload adjustment unit, which is used to adjust the preload of the first spring. The preload adjustment unit includes: The second slide groove is disposed in the fluid passage of the valve body and is located below the first spring; A preload ring is slidably disposed within the second groove, with the top of the preload ring abutting against the end of the first spring; An adjusting airbag is located within the second sliding groove and below the pre-tightening ring. The bottom of the adjusting airbag is connected to an air pressure system via an air tube.

8. A pneumatically controlled valve with directional flow difference according to claim 1, characterized in that: The lower end of the fluid passage of the valve body protrudes upward to form a limiting step, which is used to limit the maximum distance that the gasket slides downward.

9. A pneumatically controlled valve with directional flow difference according to claim 1, characterized in that: The gasket has multiple sets of through holes, each set of through holes being arranged in a circular array with the center of the gasket as the center; the retaining ring is a solid ring with a certain radial width, and the radius of the distribution circle of the through holes coincides with the radius of the solid ring of the retaining ring; when the gasket is in close contact with the retaining ring, the bottom surface of the retaining ring closes part of the opening area of ​​the through holes.

10. A pneumatically controlled valve with directional flow difference according to claim 1, characterized in that: The bottom surface of the gasket has several radially distributed drainage grooves. One end of each drainage groove extends to the outer edge of the gasket, and the other end of each drainage groove is connected to the lower port of the through hole, which is used to guide the reverse airflow and generate a purging vortex at the through hole.

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