Monostable diaphragm pump system based on self-excitation pneumatic modulation

Abstract

The monostable diaphragm pump system based on self-excitation pneumatic modulation comprises a soft valve clamp inner body, a soft valve clamp outer body, a diaphragm clamp, a soft valve and a monostable diaphragm, the soft valve and the monostable diaphragm divide a central cavity into an air volume cavity, a driving cavity and a pumping cavity, under the action of external force, the monostable diaphragm can deform and protrude towards the pumping cavity, and the soft valve clamp outer body and the diaphragm clamp outer body are arranged in the central cavity. When the external force is removed or reduced, the monostable diaphragm recovers deformation, and when gas is introduced into the gas inlet channel, the soft valve is periodically switched on and off, and pulse gas flow which is periodically switched on and off is formed in the driving cavity. According to the monostable diaphragm pump system, periodic pneumatic driving can be achieved under a constant-pressure air source, pulse airflow needed for driving the diaphragm pump can be generated without an external electronic control unit, an electromagnetic valve and a complex control circuit, the complexity of the system is remarkably reduced, and the reliability of the system is improved. And the applicability and the safety of the system in an electromagnetic sensitive, flammable and explosive or extreme environment are improved.

Description

Technical Field

[0001] This application relates to the field of diaphragm pump technology, and in particular to a monostable diaphragm pump system based on self-excited pneumatic modulation. Background Technology

[0002] In the field of soft robotics, pneumatic actuation, with its inherent compliance, high power density, and operational safety, has become one of the core methods for driving soft actuators. For a soft actuator to achieve continuous, rhythmic motion or action output, it typically requires a continuous pumping of pulsed airflow into its internal pneumatic network to drive the actuator to complete preset actions such as extension, bending, etc. Therefore, a stable supply of pulsed airflow is a crucial prerequisite for the reliable operation of soft robots.

[0003] Currently, traditional technologies for providing pulsed airflow to soft actuators generally rely on external electronic control units working in conjunction with high-speed switching solenoid valves. Electronic control signals control the on / off frequency of the solenoid valves, modulating the input constant pressure or constant flow air source into the required pulsed airflow. This reliance on electronic control inevitably increases the complexity and bulkiness of the soft robot system. It requires additional power supply modules and control circuits, as well as ensuring the reliability of the electronic components and valves, significantly increasing the system's potential for failure. More importantly, this high dependence on electrical systems severely limits its application in electromagnetically sensitive, flammable, explosive, power-free, or extremely simplified scenarios, failing to meet the core requirements for intrinsic system safety and anti-interference capabilities in such environments.

[0004] Meanwhile, in the field of diaphragm pumps, existing pneumatically driven diaphragm pumps mostly employ a bistable diaphragm structure, which relies on the sudden flipping of the diaphragm between two extreme positions (protruding on both sides along the thickness direction) to achieve fluid pumping. However, the flipping actuation mode of the bistable diaphragm has inherent defects. It generates significant impact and vibration during state switching, which not only easily leads to diaphragm instability and accelerated wear, but also shortens the fatigue life of the diaphragm and the entire pump system, affecting the smoothness and continuity of the pumping process, making it difficult to adapt to the drive smoothness requirements of soft robots.

[0005] Furthermore, the structural design of existing diaphragm pump systems often fails to achieve efficient integration of pneumatic modulation and fluid pumping. Most require additional configuration of a separate pulse air source modulation module, resulting in a large overall system size and low modularity, making it difficult to embed into miniaturized and lightweight soft robots and failing to meet the development needs of integrated soft robots.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] To address one of the aforementioned technical problems, this application provides a monostable diaphragm pump system based on self-excited pneumatic modulation.

[0008] The present invention adopts the following technical solution:

[0009] A monostable diaphragm pump system based on self-excited pneumatic modulation includes:

[0010] The soft valve clamp consists of an inner body, an outer body, and a diaphragm clamp, arranged sequentially, forming a central cavity.

[0011] A soft valve and a monostable diaphragm are provided. The soft valve is installed between the outer body and the inner body of the soft valve fixture, and the monostable diaphragm is installed between the inner body and the diaphragm fixture. The soft valve and the monostable diaphragm divide the central cavity into a gas-capacity cavity, a drive cavity, and a pumping cavity. The gas-capacity cavity is located between the outer body and the soft valve fixture, the drive cavity is located between the soft valve and the monostable diaphragm, and the pumping cavity is located between the monostable diaphragm and the diaphragm fixture. The inner and outer bodies of the soft valve fixture are provided with an inlet and an outlet passage communicating with the gas-capacity cavity. Under the action of external force, the monostable diaphragm can deform and bulge towards the pumping cavity. When the external force is removed or reduced, the monostable diaphragm returns to its original deformation and bulges towards the drive cavity.

[0012] With gas flowing into the intake duct, the soft valve periodically opens and closes, forming a periodically opening and closing pulsed airflow in the drive chamber, causing the monostable diaphragm to circumferentially and alternately bulge outwards into the pump chamber and drive chamber.

[0013] Optionally, the soft valve includes a resilient valve plate and a skirt disposed around the edge of the resilient valve plate;

[0014] A slit is made on the elastic valve plate;

[0015] The skirt is held between the inner body of the soft valve clamp and the outer body of the soft valve clamp;

[0016] When gas is introduced into the intake duct, if the pressure difference between the gas chamber and the drive chamber is greater than the opening critical pressure difference of the soft valve, the elastic valve plate deforms, opening the gas chamber and the drive chamber. If the pressure difference between the gas chamber and the drive chamber is less than the opening critical pressure difference, the elastic valve plate returns to its original shape, cutting off the gas chamber and the drive chamber.

[0017] Optionally, the inner body of the soft valve clamp has a central through groove, and the exhaust passage includes an exhaust hole formed on the inner body of the soft valve clamp, the exhaust hole communicating with the central through groove;

[0018] The soft valve and the monostable diaphragm respectively seal the two ends of the central through groove to form the drive cavity;

[0019] The air intake includes a first channel section formed on the inner body of the soft valve clamp and a second channel section formed on the outer body of the soft valve clamp. The second channel section communicates with the air chamber. When the inner body and the outer body of the soft valve clamp are connected, the first channel section and the second channel section are connected.

[0020] Optionally, the monostable diaphragm pump system based on self-excited pneumatic modulation includes a first gasket;

[0021] The first washer has a center hole and a side hole;

[0022] The first washer is pressed between the inner body of the soft valve clamp and the outer body of the soft valve clamp;

[0023] The central hole avoids and connects the central through groove and the air cavity;

[0024] The side hole connects the first channel segment and the second channel segment.

[0025] Optionally, a throttle valve is provided on the exhaust passage, which can adjust the opening of the exhaust passage.

[0026] Optionally, a limiting part is provided on the diaphragm clamp;

[0027] The limiting part is located in the pumping chamber;

[0028] When the monostable diaphragm protrudes towards the pumping chamber, it can abut against the limiting portion.

[0029] Optionally, the monostable diaphragm has a dome-shaped deformable sheet;

[0030] The thickness of the dome deformable sheet gradually increases in the direction from the center to the edge.

[0031] Optionally, the diaphragm clamp is provided with soft valve clamp inner bodies on both sides along the thickness direction, and the soft valve clamp outer body is provided on the side of the soft valve clamp inner body opposite to the diaphragm clamp;

[0032] The pumping chamber is formed between two monostable diaphragms in a monostable diaphragm pump system.

[0033] Optionally, the opening critical pressure difference of the soft valves located on both sides of the pumping chamber is different;

[0034] The two air inlets of the monostable diaphragm pump system are connected to the same air source. Under the action of airflow, the two monostable diaphragms alternately bulge and deform toward one side of the pumping chamber.

[0035] Optionally, an observation window is provided on the inner body of the soft valve clamp and / or the diaphragm clamp, the observation window is connected to the central cavity, and the observation window is closed by a transparent plate.

[0036] By adopting the above technical solution, this application has the following beneficial effects:

[0037] The monostable diaphragm pump system of this application can achieve periodic pneumatic drive under constant pressure air source. It can generate the pulse airflow required to drive the diaphragm pump without external electronic control unit, solenoid valve and complex control circuit, which significantly reduces the system complexity and improves the applicability and safety of the system in electromagnetically sensitive, flammable and explosive or extreme environments.

[0038] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0039] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0040] Figure 1 A cross-sectional view of a first monostable diaphragm pump system based on self-excited pneumatic modulation provided in an embodiment of this disclosure is shown.

[0041] Figure 2 Show Figure 1 The path diagram of the driving gas and pumped fluid in the monostable diaphragm pump system;

[0042] Figure 3 This diagram illustrates the structure of a soft valve in a first type of monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in an embodiment of this disclosure.

[0043] Figure 4 A cross-sectional view of a soft valve in a first type of monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in an embodiment of this disclosure, is shown.

[0044] Figure 5 This diagram illustrates the structure of the monostable diaphragm in the first monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in this embodiment of the present disclosure.

[0045] Figure 6 This diagram illustrates the structure of the soft valve clamp outer body in the first type of monostable diaphragm pump system based on self-excited pneumatic modulation provided in this disclosure embodiment;

[0046] Figure 7This diagram shows a cross-sectional view of the outer body of the soft valve clamp in a first type of monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in an embodiment of this disclosure.

[0047] Figure 8 This diagram shows the internal structure of the soft valve clamp in the first type of monostable diaphragm pump system based on self-excited pneumatic modulation provided in this disclosure embodiment;

[0048] Figure 9 This diagram shows the internal structure of the soft valve clamp in the first type of monostable diaphragm pump system based on self-excited pneumatic modulation provided in this disclosure embodiment;

[0049] Figure 10 This diagram illustrates the structure of a diaphragm clamp in a first type of monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in an embodiment of this disclosure.

[0050] Figure 11 This diagram shows the structure of the first gasket in a first monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in an embodiment of this disclosure.

[0051] Figure 12 This diagram illustrates the structure of the second gasket in a first type of monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in an embodiment of this disclosure.

[0052] Figure 13 This diagram illustrates the structure of a second monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in an embodiment of this disclosure.

[0053] Figure 14 This diagram illustrates the structure of the soft valve clamp outer body in a second type of self-excited pneumatic modulation monostable diaphragm pump system provided in this disclosure embodiment;

[0054] Figure 15 This diagram illustrates the structure of a diaphragm clamp in a second type of monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in an embodiment of this disclosure.

[0055] Figure 16 A cross-sectional view of a third monostable diaphragm pump system based on self-excited pneumatic modulation provided in this disclosure is shown.

[0056] Figure 17 This diagram illustrates the path of the driving gas and pumping fluid within a third monostable diaphragm pump system based on self-excited pneumatic modulation, as provided in this embodiment of the present disclosure.

[0057] Figure 18 This image shows a cross-sectional view of the diaphragm clamp in a third type of self-excited pneumatic modulation monostable diaphragm pump system provided in this disclosure.

[0058] In the diagram: 1. Flexible valve; 110. Elastic valve plate; 111. Slit; 120. Skirt; 2. Flexible valve fixture outer body; 3. First washer; 31. Center hole; 32. Side hole; 4. Flexible valve fixture inner body; 41. Central through groove; 5. Second washer; 6. Monostable diaphragm; 61. Dome deformation plate; 62. Diaphragm skirt; 7. Diaphragm fixture; 8. Bolt; 9. Nut; 10. Transparent plate; 11. First check valve; 12. Second check valve; 13. Throttling valve; 14. Pipeline; a. Gas chamber; b. Drive chamber; c. Pumping chamber; c1. Limiting part; d. Inlet passage; d1. First channel section; d2. Second channel section; e. Exhaust passage; f. Sealing ring.

[0059] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0061] In the description of this invention, it should be noted that the terms "upper", "lower", "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 component 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.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] like Figures 1 to 18As shown, this application provides a monostable diaphragm pump system based on self-excited pneumatic modulation, including: a soft valve clamp inner body 4, a soft valve clamp outer body 2, a diaphragm clamp 7, a soft valve 1, and a monostable diaphragm 6. The soft valve clamp outer body, the soft valve clamp inner body, and the diaphragm clamp are arranged sequentially, and the soft valve clamp inner body 4, the soft valve clamp outer body 2, and the diaphragm clamp 7 enclose a central cavity. A soft valve 1 is installed between the soft valve clamp outer body 2 and the soft valve clamp inner body 4. A monostable diaphragm 6 is installed between the soft valve clamp inner body 4 and the diaphragm clamp 7. The soft valve 1 and the monostable diaphragm 6 divide the central cavity into a gas-capacity cavity a, a driving cavity b, and a pumping cavity c. The gas-capacity cavity a is located between the soft valve clamp outer body and the soft valve. The driving cavity b is located between the soft valve 1 and the monostable diaphragm 6. The pumping cavity c is located between the monostable diaphragm 6 and the diaphragm clamp 7. The soft valve clamp inner body 4 and the soft valve clamp outer body 2 are provided with an air inlet d and an exhaust d communicating with the gas-capacity cavity a. Under the action of external force, the monostable diaphragm 6 can deform and bulge towards the pumping cavity c. When the external force is removed or reduced, the monostable diaphragm 6 returns to its original shape and bulges towards the driving cavity b. With gas flowing through the intake duct d, the soft valve 1 periodically opens and closes, forming a periodically opening and closing pulsed airflow in the drive chamber b. This causes the monostable diaphragm 6 to circumferentially and alternately bulge outwards from the pumping chamber and the drive chamber, thereby alternately shrinking and increasing the volume of the pumping chamber c, thus realizing fluid transport.

[0064] The monostable diaphragm pump system based on self-excited pneumatic modulation provided in this application addresses the core pain points of existing soft robot pneumatic drive and diaphragm pump technologies (reliance on electronic control, complex structure, large impact of bistable diaphragms, low integration, etc.). Through innovative structural design and a self-excited working mechanism, it achieves several innovative breakthroughs, possessing significant technical advantages and practical value. The monostable diaphragm pump system provided in this application eliminates reliance on electronic control, improving the system's intrinsic safety and environmental adaptability. This monostable diaphragm pump system, through the self-excited periodic on / off mechanism of soft valve 1, utilizes the dynamic evolution of the air pressure difference between the air chamber a and the drive chamber b to spontaneously modulate the constant pressure airflow into a pulsed airflow. It eliminates the need for external electronic control units, high-speed switching solenoid valves, or complex control circuits, completely freeing it from dependence on electrical systems. This not only significantly simplifies the system structure, reduces the number of components, lowers system bulk and manufacturing costs, but also effectively solves the problem of poor applicability of traditional pneumatic drive solutions in electromagnetically sensitive, flammable and explosive, power-free, or extremely simplified scenarios. The system of this application has no electronic components, which avoids safety hazards caused by electromagnetic interference and circuit failure, and improves the intrinsic safety, anti-electromagnetic interference capability and extreme environment adaptability of the system. It can be widely used in soft robots, special pneumatic equipment and other scenarios where circuit dependence is strictly limited.

[0065] This application innovatively employs a monostable diaphragm structure. Through structural design, the diaphragm undergoes continuous and reversible bidirectional elastic deformation solely around its inherent monostable equilibrium state, completely avoiding the design flaw of traditional bistable diaphragm pumps that rely on the diaphragm flipping between two extreme positions. This effectively solves the problems of large impacts, severe vibrations, instability, and short fatigue life during state transitions in existing bistable diaphragm pumps, achieving smooth diaphragm operation, reducing structural wear, and significantly extending the service life of the diaphragm and the entire pump system. Simultaneously, the monostable diaphragm deformation ensures the continuity and stability of the pumping process, preventing pumping interruptions due to flipping instability, reducing pulsation during fluid transport, and improving pumping accuracy and efficiency.

[0066] The monostable diaphragm pump system of this application adopts a modular assembly design of "three major clamps + two major flexible components," integrating self-excited pneumatic modulation (soft valve 1 + air-capacity cavity a) and fluid pumping (monostable diaphragm 6 + pumping cavity c) into one unit. The overall structure has no high-speed rotating parts, complex transmission mechanisms, or multi-stage valve core assemblies, resulting in fewer parts, simpler assembly, and a compact size. Furthermore, the soft valve clamp inner body 4, soft valve clamp outer body 2, and diaphragm clamp 7 are coaxially assembled, forming a central cavity with high space utilization. The system can be manufactured with an integrated flexible material or a modular connection method with the soft robot body, and can be directly embedded as a functional pneumatic device inside the soft robot. This effectively solves the problems of low integration and large size of existing diaphragm pump systems, making them difficult to adapt to the miniaturization, lightweighting, and integration needs of soft robots. It is particularly suitable for embedded application in the internal pneumatic network of soft robots.

[0067] In some possible implementations, such as Figure 3 and Figure 4 As shown, the flexible valve 1 includes an elastic valve plate 110 and a skirt 120 disposed around the edge of the elastic valve plate 110. A slit 111 is formed on the elastic valve plate 110, and the skirt 120 is clamped between the inner body 4 and the outer body 2 of the flexible valve fixture. When gas is introduced into the air intake duct d, if the pressure difference between the gas chamber a and the drive chamber b is greater than the opening critical pressure difference of the flexible valve 1, the elastic valve plate 110 deforms, opening the gas chamber a and the drive chamber b. If the pressure difference between the gas chamber a and the drive chamber b is less than the opening critical pressure difference, the elastic valve plate 110 returns to its original shape, cutting off the gas chamber a and the drive chamber b.

[0068] The skirt 120 is arranged around the edge of the elastic valve plate 110 and is integrally formed with the elastic valve plate 110. Its thickness can be slightly larger than that of the elastic valve plate 110. The whole is ring-shaped and adapts to the clamping surface structure of the inner body 4 and the outer body 2 of the soft valve clamp to ensure reliable sealing after clamping.

[0069] The skirt 120, serving as a fixing and sealing component for the flexible valve 1, is tightly clamped between the inner body 4 and outer body 2 of the flexible valve clamp. During clamping, it exhibits no significant deformation, achieving precise positioning and fixed support of the flexible valve 1 between the two clamps. It also effectively seals the gap between the edge of the elastic valve plate 110 and the clamps, preventing gas leakage between the gas chamber a and the drive chamber b. This ensures that the pressure difference can stably act on the elastic valve plate 110, providing a sealing guarantee for the precise opening and closing of the flexible valve 1. Simultaneously, the annular structure of the skirt 120 evenly distributes the clamping force, preventing damage to the edge of the elastic valve plate 110 due to excessive localized force, thus extending the service life of the flexible valve 1.

[0070] The slit 111 is located in the middle region of the elastic valve plate 110. It can be a herringbone, straight, or annular slit (preferably a herringbone slit to ensure uniform deformation and smooth flow). The slit 111 extends through the thickness of the elastic valve plate 110. When the pressure difference between the gas chamber a and the drive chamber b exceeds the critical opening pressure difference of the soft valve 1, the elastic valve plate 110 deforms, protruding towards the drive chamber b, thus opening the slit 111 and connecting the gas chamber a and the drive chamber b. When the external force is removed or reduced, the monostable diaphragm 6 recovers its deformation, protruding towards the drive chamber b, and the slit 111 returns to its closed state.

[0071] The slit 111 optimizes the deformation characteristics of the elastic valve plate 110, reduces its opening resistance, and allows it to deform rapidly under small pressure differences, thus improving the response speed of the soft valve 1. Simultaneously, the slit 111 guides the deformation direction of the elastic valve plate 110, ensuring it protrudes towards the drive chamber b under pressure difference, opening the slit 111 and forming a complete gas flow channel. This allows for rapid connection between the gas chamber a and the drive chamber b, ensuring smooth gas flow. When the pressure difference decreases, the elastic valve plate 110 resets under its own elastic restoring force, and the slit 111 returns to its closed state, achieving precise disconnection between the gas chamber a and the drive chamber b, avoiding problems such as incomplete connection or incomplete disconnection.

[0072] In some possible implementations, such as Figure 8 and Figure 9As shown, the inner body 4 of the soft valve clamp has a central through groove 41. The exhaust passage e includes an exhaust hole formed on the inner body 4 of the soft valve clamp, which communicates with the central through groove 41. The soft valve 1 and the monostable diaphragm 6 respectively seal both ends of the central through groove 41 to form the drive chamber b. The intake passage d includes a first channel section d1 formed on the inner body 4 of the soft valve clamp and a second channel section d2 formed on the outer body 2 of the soft valve clamp. The first channel section d1 is isolated from the central through groove 41 and is not connected to the inner body 4 of the soft valve clamp. The second channel section d2 communicates with the gas cavity a. When the inner body 4 of the soft valve clamp and the outer body 2 of the soft valve clamp are connected, the first channel section d1 and the second channel section d2 are connected. By providing the second channel section d2 on the outer body 2 of the soft valve clamp, the gas introduced into the inner body 4 of the soft valve clamp through the first channel section d1 can be smoothly introduced into the gas cavity a.

[0073] In some possible implementations, such as Figure 11 As shown, the monostable diaphragm pump system based on self-excited pneumatic modulation includes a first washer 3. The first washer 3 has a central hole 31 and a side hole 32. The first washer 3 is pressed between the inner body 4 and the outer body 2 of the soft valve clamp. The central hole 31 avoids and connects the central through groove 41 and the gas cavity a. The side hole 32 connects the first channel section d1 and the second channel section d2. Other parts of the first washer 3 are used to seal the gap between the inner body 4 and the outer body 2 of the soft valve clamp.

[0074] The first gasket 3 can be made of a flexible sealing material (preferably silicone rubber, fluororubber, etc. that match the material of the soft valve 1 to ensure sealing compatibility and elastic compensation capability). It has an overall ring-shaped sheet structure with uniform thickness, which can adapt to the clamping surface size of the inner body 4 and the outer body of the soft valve clamp.

[0075] Except for the functional areas of the central hole 31 and the side hole 32, the other parts of the first washer 3 (i.e. the annular area outside the hole) are sealing areas. After this area is compressed, it can completely cover and seal all gaps between the inner body 4 of the soft valve clamp and the outer body 2 of the soft valve clamp, preventing the constant pressure gas in the gas cavity a from leaking from the clamp gap, while avoiding external impurities from entering the system, ensuring stable gas pressure in the gas cavity a, providing reliable sealing protection for the self-excited periodic on / off of the soft valve 1 and the stable operation of the system as a whole, reducing gas pressure loss and improving system efficiency.

[0076] In some possible implementations, such as Figure 1As shown, a throttle valve 13 is installed on the exhaust duct e, which can adjust the opening of the exhaust duct e. The throttle valve 13, located on the exhaust duct e of the system, adopts an adjustable structural design (such as a knob type or needle valve type). Operators can flexibly change the opening of the exhaust duct e by rotating the knob or adjusting the needle valve stroke, thereby adjusting the gas flow cross-sectional area of ​​the exhaust duct e and achieving controllable adjustment of the system's damping characteristics. The overall structure of the throttle valve 13 is simple and easy to adjust, requiring no complex electronic control or mechanical transmission components, and is suitable for the self-excited operation concept of the system without external control.

[0077] Throttling valve 13 is fixedly mounted on the exhaust passage of drive chamber b, specifically connected in series in exhaust passage e. One end can be connected to drive chamber b, and the other end can be connected to the external atmosphere or the system exhaust circuit, ensuring that the gas in drive chamber b can be stably discharged through throttle valve 13. The core function of throttle valve 13 is as a fixed damping element of the system, rather than an on / off control element, which is fundamentally different from the "periodic on / off" function of soft valve 1. Its core function is to provide a controllable and constant flow resistance for the gas discharge of drive chamber b. By adjusting the magnitude of this flow resistance, the depressurization rate of drive chamber b is changed, thereby regulating the system's self-excited oscillation frequency and ultimately achieving passive regulation of the diaphragm pump's output flow rate. Throttling valve 13 is in a continuous exhaust state throughout the entire system operating cycle, but its exhaust volume is small, only used for slow depressurization, and will not affect the normal charging and pressure accumulation of drive chamber b. Meanwhile, during the core operating cycle of the system (i.e., the self-excited oscillation cycle of soft valve 1), the opening of throttle valve 13 is usually preset. Once set, it will not dynamically and periodically "on" or "off" during the entire operation, maintaining a constant opening and flow resistance to ensure a stable depressurization rate in drive chamber b. The working principle of throttle valve 13 is based on "controllable flow resistance adjustment." By changing its own opening (i.e., the flow cross-sectional area of ​​exhaust channel e), it adjusts the flow resistance of gas discharged from drive chamber b, thereby controlling the rate of pressure reduction in drive chamber b. The larger the opening, the smaller the flow resistance, and the faster the depressurization rate in drive chamber b. The smaller the opening, the larger the flow resistance, and the slower the depressurization rate in drive chamber b. It is important to clarify that throttle valve 13 is always in the open state. As long as soft valve 1 introduces air into drive chamber b, the air pressure in drive chamber b increases, and the gas will be continuously discharged through throttle valve 13. It is not only after soft valve 1 is closed that the gas is discharged from throttle valve 13. Its continuous exhaust characteristic is the key to maintaining the self-excited oscillation of the system.

[0078] Specifically, when soft valve 1 opens, the constant-pressure gas in gas chamber a rapidly flows into drive chamber b through slit 111, causing the gas pressure in drive chamber b to rise rapidly. Simultaneously, throttle valve 13 continuously vents gas, which is slowly discharged. The rate of pressure increase in drive chamber b is much greater than the rate of pressure release, ensuring that the monostable diaphragm 6 can be deformed. When soft valve 1 closes, drive chamber b stops filling with gas and only continues to release pressure through throttle valve 13, gradually reducing the pressure and accumulating a pressure difference for the next opening of soft valve 1.

[0079] In some possible implementations, such as Figure 1 and Figure 10 As shown, a limiting part c1 is provided on the diaphragm clamp 7. The limiting part c1 is located in the pumping chamber c and can stop against the limiting part c1 when the monostable diaphragm 6 protrudes to the side of the pumping chamber c.

[0080] The limiting part c1 may include or may be a pin disposed at the center of the pumping cavity c. When the monostable diaphragm 6 protrudes and deforms toward the pumping cavity c, the pin abuts against the side of the monostable diaphragm 6 facing the pumping cavity c, providing geometric constraint and support, preventing accidental instability due to excessive deformation, and facilitating the smooth recovery of the monostable diaphragm 6 from deformation and protrusion toward the drive cavity b when the pressure difference decreases during the interval of the pulsed airflow.

[0081] The limiting part c1 can be partially connected to the inner wall of the pumping chamber c and partially extended towards the driving chamber b. The limiting part c1 can include a main body and a ejector pin. The ejector pin can be threaded to the main body. By rotating the ejector pin, the length of the ejector pin extending into the driving chamber b can be adjusted, which can change the maximum downward displacement of the monostable diaphragm 6, thereby directly adjusting the effective volume change of the pumping chamber c.

[0082] During the deformation of the monostable diaphragm 6, the ejector pin located inside the diaphragm clamp 7 maintains constant contact with or limits the inner surface of the monostable diaphragm 6. This provides geometric constraints and mechanical support when the diaphragm undergoes large deflection, preventing the diaphragm from becoming unstable and overturning due to excessive instantaneous pressure difference. Through the synergistic effect between the ejector pin and the monostable diaphragm 6, the diaphragm maintains a monostable operating mode throughout the entire working cycle, ensuring the smoothness of the pumping process and the structural lifespan.

[0083] In some possible implementations, such as Figure 1 and Figure 2 As shown, the pumping chamber c has an inlet and an outlet at its two ends, respectively. The inlet is connected to a first check valve 11, and the outlet is connected to a second check valve 12. The first check valve 11 only opens the flow direction from the outside to the pumping chamber c, while the second check valve 12 only opens the flow path from the pumping chamber c to the outside.

[0084] In some possible implementations, such as Figure 5As shown, the monostable diaphragm 6 has a dome-shaped deformable sheet 61 and a diaphragm skirt 62 located around the edge of the dome-shaped deformable sheet 61. The thickness of the dome-shaped deformable sheet 61 gradually increases in the direction from the center of the dome-shaped deformable sheet 61 to the edge.

[0085] In this application, the monostable diaphragm 6 is dome-shaped and can be integrally molded from thermoplastic polyurethane (TPU) or silicone rubber. Its thickness increases gradually from the center to the edge. The thinnest part at the center can be 0.7–1.2 mm thick, and the thickest part at the edge can be 1.5–2.0 mm thick, forming a continuous transition shape that is thin in the middle and thick around the edges. The valve body is internally divided into a middle drive chamber b and a lower pumping chamber c. This design allows it to naturally maintain a raised monostable equilibrium configuration when there is no pressure difference, and the stiffness increases from the center to the edge, ensuring smooth deformation and preventing overturning.

[0086] The monostable diaphragm 6 has a dome-shaped convex structure with a regular shape, continuous curved surface, no splicing or damage, and is a one-piece molded structure without weak joints. It can adapt to the structural dimensions of the valve body cavity, ensuring a tight fit and reliable seal with the valve body wall. Its dome-shaped natural configuration is the basis for achieving monostable equilibrium characteristics, ensuring that it naturally maintains its convex state towards the drive chamber b when there is no pressure difference, without the need for additional external support. The monostable diaphragm 6 can be made of thermoplastic polyurethane (TPU) or silicone rubber in a one-piece molding process. Both materials possess the core characteristics to adapt to the system's operating requirements, allowing for flexible selection based on the actual application scenario (such as pumping medium and operating pressure). Thermoplastic polyurethane (TPU) has excellent elastic recovery, fatigue resistance, and mechanical strength; it is wear-resistant, oil-resistant, and corrosion-resistant, capable of withstanding long-term repeated deformation, and is not prone to plastic deformation or tearing, resulting in a long service life. Silicone rubber possesses excellent flexibility, sealing properties, and high-temperature resistance. It exhibits low deformation resistance, enabling rapid deformation and recovery. It is also suitable for precise operation under low pressure differential conditions and exhibits good compatibility with pumped water, common pharmaceutical solutions, and other media, with no harmful substances leaching out. In this application, the thickness of the monostable diaphragm 6 is not uniform but rather increases gradually from the center to the edge, forming a continuous transition shape of "thin in the middle and thick around the edges," without significant abrupt thickness changes, ensuring a smooth deformation process and uniform stress distribution. The specific dimensions of the dome deformable plate 61 can be set as follows: the thinnest part at the center can be 0.7–1.2 mm. This thickness design reduces the stiffness of the central region of the diaphragm, making it easier for the central part to deform under pressure differential, thus improving deformation sensitivity and response speed. The thickest part at the edge can be 1.5–2.0 mm. This edge thickening design enhances the stiffness and structural strength of the diaphragm edge, meeting the requirements for edge fixing and preventing damage or loosening of the edge due to long-term stress or repeated deformation, while also improving the sealing reliability between the edge and the inner wall of the valve body.

[0087] In some possible implementation schemes, combined Figure 1 and Figure 12 As shown, the monostable diaphragm pump system also includes a second washer 5, which is disposed between the soft valve clamp outer body 2 and the diaphragm clamp 7 to seal the gap between them. The second washer 5 has an opening in its center to allow passage between the drive chamber b and the pumping chamber c. The first washer 3 and the second washer 5 can be designed with reserved space for pressure deformation. The washer has an elastic deformation allowance in the radial direction, allowing it to undergo controlled deformation under assembly preload and working air pressure, thereby automatically compensating for assembly errors and improving airtightness and structural stability.

[0088] like Figure 1 As shown, in some possible implementations, the monostable diaphragm pump system also includes a power source module and a pressure controller. The power source module includes a gas source connected to the air inlet d via pipe 14, and the pressure controller is located on pipe 14 to regulate the gas pressure.

[0089] The following provides a detailed explanation of the principle of the monostable diaphragm pump system based on self-excited pneumatic modulation of this application:

[0090] The soft valve 1 forms a self-excited oscillation under the action of a constant pressure gas source, and its working process includes the following state evolution stages:

[0091] Phase 1: Initial Closure Phase

[0092] In the initial state of the system, soft valve 1 is in the closed state, the gas chamber a and the drive chamber b are isolated, soft valve 1 protrudes to the side of the gas chamber a, and the constant pressure gas source acts on the gas chamber a through the air inlet d.

[0093] Phase Two: Pressure Difference Accumulation Phase

[0094] When the soft valve 1 is closed, the air pressure at the front end of the soft valve 1 (air chamber a) continues to rise, while the air pressure at the rear end of the valve body (drive chamber b) rises relatively slowly, thus creating a gradually increasing pressure difference between the front and rear sides of the soft valve 1.

[0095] Phase 3: Flexion Initiation Phase

[0096] When the pressure difference between the front and rear sides of the soft valve 1 reaches the critical opening pressure difference corresponding to the structure of the soft valve 1, the valve body of the soft valve 1 undergoes instantaneous buckling deformation under the action of aerodynamic force, the soft valve 1 protrudes towards the drive chamber b, the soft valve 1 opens rapidly (the slit 111 is connected), the constant pressure air source is released into the drive chamber b, causing the air pressure at the rear end of the soft valve 1 to rise rapidly.

[0097] Phase 4: Driving and Shutting Down

[0098] As the air pressure at the rear end of soft valve 1 (drive chamber b) rapidly increases, the pressure difference between the front and rear sides of soft valve 1 gradually decreases. When the pressure difference decreases to the closing critical value of soft valve 1, soft valve 1 closes again under its own elastic restoring force and protrudes towards the gas chamber a side. At this time, the air pressure in drive chamber b reaches the maximum value within the cycle.

[0099] Phase 5: Depressurization and Recovery Phase

[0100] After the soft valve 1 is closed, the gas in the drive chamber b is gradually discharged through the throttle valve 13, causing the gas pressure in the drive chamber b to gradually decrease. When the gas pressure in the drive chamber b decreases to the point where the pressure difference across the soft valve 1 reaches the opening critical value again, the soft valve 1 bends open again. The above process is repeated cyclically, thereby forming a stable self-excited oscillation under constant pressure gas source input conditions, causing the gas pressure in the drive chamber b to change periodically.

[0101] The operating logic of the system provided in this application is as follows: The continuous constant pressure airflow provided by the power source module acts on the soft valve 1, driving it to generate self-excited oscillation and output pulsed airflow. This pulsed airflow acts on one side of the driving chamber b of the monostable diaphragm 6, driving the monostable diaphragm 6 to reciprocate around its inherent monostable equilibrium position (corresponding to the convex shape towards the gas cavity a naturally maintained by the gradient stiffness distribution of the monostable diaphragm 6 when there is no pressure difference between the inside and outside of the driving chamber b). At the same time, in order to prevent the monostable diaphragm 6 from occasionally entering other steady states, the pin on the pumping chamber c side always plays a role, thereby periodically changing the volume of the pumping chamber c, and cooperating with the check valve to realize the directional pumping of fluid.

[0102] A monostable diaphragm pump system will undergo the following state processes during operation:

[0103] State 1: Constant pressure air source input and aerodynamic conditions established;

[0104] By inputting gas at a constant pressure through a gas source, the gas passes through a gas pressure controller and enters the gas chamber a in sequence, thereby forming stable aerodynamic boundary conditions at the system inlet side.

[0105] The gas cavity a is used to buffer gas source fluctuations and together with the subsequent soft valve 1 unit, constitutes the necessary condition for self-excited pneumatic oscillation.

[0106] State 2: Generation of self-excited aerodynamic modulation;

[0107] The constant pressure gas enters the gas chamber a through the inlet of the air inlet d of the soft valve clamp body 4. Under the combined action of the throttle valve 13 and the flexible structure of the soft valve 1, the soft valve 1 generates periodic flow-pressure feedback coupling between the gas chamber a and the drive chamber b, so that the input constant pressure gas spontaneously generates periodic opening and closing behavior without external electronic control, thereby outputting pulsed airflow.

[0108] During this process, the opening and closing frequency of soft valve 1 is jointly determined by the gas source pressure, the damping characteristics of throttle valve 13, and the material and structural parameters of soft valve 1, forming a stable self-excited oscillation state. Specifically, the constant pressure gas source needs to reach the system coupling pressure to open soft valve 1; further increasing the pressure by using a pressure controller can improve the operating frequency.

[0109] State 3: Pulsed airflow drives continuous deformation of the monostable diaphragm 6;

[0110] The pulsed airflow output by the soft valve 1 enters the drive chamber b and applies a periodically changing air pressure load to the side surface of the monostable diaphragm 6 facing away from the drive chamber b, causing the monostable diaphragm 6 to undergo large reciprocating deflection deformation around its inherent monostable equilibrium configuration.

[0111] The monostable diaphragm 6 has a gradient thickness along the radial direction, which allows it to naturally maintain a dome-shaped bulge (protruding toward the drive cavity b) when there is no internal or external pressure difference. This shape corresponds to the only stable static equilibrium position of the system. Under the action of pulsed air pressure, the diaphragm only undergoes continuous reversible elastic deformation, without flipping into the second steady state (protruding toward the pumping cavity c).

[0112] State 4: Pin constraint and steady state maintenance;

[0113] During the diaphragm deformation process, the ejector pin set in the inner cavity of the diaphragm clamp 7 always maintains contact or limit the surface of the monostable diaphragm 6 located on the pumping chamber c side, which is used to provide geometric constraints and mechanical support when the diaphragm sinks with large deflection, thereby preventing the diaphragm from becoming unstable and overturning due to excessive instantaneous pressure difference.

[0114] Through the synergistic effect between the ejector pin and the diaphragm, the diaphragm maintains a monostable operating mode throughout the entire working cycle, ensuring the smoothness of the pumping process and the structural lifespan.

[0115] State 5: Changes in the volume of pumping chamber c and fluid suction / discharge;

[0116] During the downward deformation stage of the monostable diaphragm 6, the volume of the pumping chamber c decreases, the pressure inside the chamber increases, the first check valve 11 closes, the second check valve 12 opens, and the fluid inside the pumping chamber c is discharged.

[0117] During the rebound phase of the monostable diaphragm 6, the volume of the pumping chamber c increases, the pressure inside the chamber decreases, the first check valve 11 opens, the second check valve 12 closes, and external fluid is drawn into the pumping chamber c.

[0118] The directional transport of fluids is achieved through the aforementioned periodic process.

[0119] State 6: Continuous pumping coupled with software system

[0120] Under a constant gas supply, states 2 to 5 are repeated periodically, enabling the monostable diaphragm pump 6 to achieve continuous and stable pumping output. The pumping output can be directly used for charging and discharging gas, internal fluid circulation, or cooling medium transport in soft robot actuators.

[0121] Example 1

[0122] like Figures 1 to 12 As shown, this embodiment provides a monostable diaphragm pump system based on self-excited pneumatic modulation. Its core is the diaphragm pump body module, which is assembled by fastening the various components with bolts 8 and nuts 9.

[0123] Specifically, the diaphragm pump module comprises, from top to bottom: a flexible valve clamp outer body 2, a first washer 3, a flexible valve clamp inner body 4, a second washer 5, a monostable diaphragm 6, and a diaphragm clamp 7. The skirt 120 of the flexible valve 1 is pressed between the flexible valve clamp outer body 2 and the flexible valve clamp inner body 4. The skirt 120 of the monostable diaphragm 6 is pressed between the flexible valve clamp inner body 4 and the diaphragm clamp 7. The first washer and the second washer are used to ensure the sealing of the upper and lower cavities of the flexible valve 1, respectively.

[0124] The soft valve 1 can be made of silicone rubber and is a thin-film structure with an elastic valve and a peripheral fixed skirt 120. Its function is to convert continuous airflow into pulsed airflow by using its own elastic deformation and feedback from upstream and downstream air pressure to generate periodic buckling oscillations under constant pressure air input.

[0125] like Figure 5 As shown, the monostable diaphragm 6 can be dome-shaped and integrally molded from thermoplastic polyurethane (TPU) or silicone rubber. Its thickness increases gradually from the center to the edge: the thinnest part at the center can be 0.7-1.2 mm, and the thickest part at the edge can be 1.5-2.0 mm, forming a continuous transition shape that is thin in the middle and thick around the edges. This design allows it to naturally maintain its convex monostable equilibrium configuration when there is no pressure difference, with stiffness increasing from the center to the edge, ensuring smooth deformation and preventing overturning.

[0126] like Figure 1 and Figure 10 As shown, the inner cavity of the diaphragm clamp 7 is provided with a limiting part c1, which may be or may include a pin. When the monostable diaphragm 6 deforms downward, the pin contacts its lower surface, providing geometric constraints and support to prevent accidental instability due to excessive deformation.

[0127] The work process is as follows Figure 1 and Figure 2As shown: Constant-pressure gas enters through the inlet of the soft valve clamp body 4. The soft valve 1 generates self-excited oscillation, and the pulsed airflow enters the drive chamber b, which is surrounded by the lower surface of the soft valve 1 and the upper surface of the monostable diaphragm 6. The pulsed gas pressure drives the monostable diaphragm 6 to reciprocate and deform, thereby changing the volume of the pumping chamber c, which is surrounded by the lower surface of the monostable diaphragm 6 and the diaphragm clamp 7. The lower pumping chamber c is connected to a first one-way valve 11 (inlet) and a second one-way valve 12 (outlet), thereby realizing the directional pumping of fluid.

[0128] Experiments show that, driven by a constant pressure gas source of 44-52 kPa, with a gas cavity a volume of 90 mL and a throttle valve 13 venting flow rate of 0.1 L / min, for a monostable diaphragm 6 with a diameter of 30 mm, a deformable dome height of 4.5 mm, a minimum thickness of 0.8 mm at the center, and a maximum thickness of 1.6 mm at the edge, the system can generate a self-excited oscillation frequency of 0.4-2 Hz, and a single pumping volume of approximately 0.5-2 mL, achieving stable fluid transport without circuit control.

[0129] Example 2

[0130] like Figures 13 to 15 As shown, to facilitate observation of the internal working state for experimental debugging or teaching demonstration, the monostable diaphragm pump system provided in this embodiment has an observation window on the inner body 4 of the soft valve clamp and / or the diaphragm clamp 7. The observation window is connected to the central cavity and is closed by a transparent plate 10. The outer body 2 of the soft valve clamp is replaced with an observable soft valve clamp outer body 2. An observation window is provided on the upper side of this outer body, and the observation window is closed by a transparent plate 10. The transparent plate 10 is made of polycarbonate (PC) or acrylic (PMMA) and can be sealed to the main body by a pressure-resistant sealing ring f. The oscillation state of the soft valve 11 can be directly observed through this window. A sealing ring f can be provided between the inner body 4 of the soft valve clamp and / or the diaphragm clamp 7 and the corresponding transparent plate 10 to seal the gap between them. The diaphragm clamp 7 can also be replaced with an observable diaphragm clamp 7, which allows direct observation of the deformation process of the monostable diaphragm 6 and the flow state of the fluid.

[0131] This embodiment does not change the core working principle of the system, but greatly enhances its visualization and debuggability, making it suitable for laboratory research, product demonstrations, or specific application scenarios that require real-time monitoring of pumping status.

[0132] Example 3:

[0133] To improve single-pump flow rate and volumetric efficiency, this embodiment provides a symmetrically expanded, co-cavity linked dual diaphragm pump structure.

[0134] like Figures 16 to 18As shown, in some possible embodiments, soft valve clamping inner bodies 4 are respectively provided on both sides of the diaphragm clamp 7 along the thickness direction, and soft valve clamping outer bodies 2 are provided on the side of the soft valve clamping inner bodies 4 opposite to the diaphragm clamp 7. The pumping chamber c is formed between the two monostable diaphragm 6 on the monostable diaphragm pump system. The opening critical pressure difference of the soft valves 1 located on both sides of the pumping chamber c is different. The two air inlets d on the monostable diaphragm pump system are connected to the same air source. Under the action of airflow, the two monostable diaphragms 6 cyclically and alternately bulge and deform towards one side of the pumping chamber c.

[0135] like Figures 14 to 16 As shown, the core of this embodiment lies in the use of an extended diaphragm clamp 7. This clamp is designed with a central common pumping chamber c, and two drive chamber b structures are symmetrically arranged on the upper and lower sides of the pumping chamber c.

[0136] The specific assembly method is as follows: each of the upper and lower end faces of the extended diaphragm clamp 7 is equipped with a set of "second gasket 5 + monostable diaphragm 6 + soft valve clamp inner body 4" components. That is, the two monostable diaphragms 6 respectively form the inner boundaries of the two drive cavities b, and the inner sides of the two monostable diaphragms 6 together form the same common pumping cavity c.

[0137] Its working process is as follows Figure 16 As shown: The constant-pressure airflow is distributed through the air path and enters the air-capacity chambers a of the two soft valves 1 through the corresponding air inlets d, until the soft valves 1 are forced open. When the pulsed airflow enters the upper drive chamber b, it drives the upper monostable diaphragm 6 to deform into the common pumping chamber c, squeezing the fluid; at the same time, the lower monostable diaphragm 6 is deformed outward in conjunction. Conversely, when the pulsed airflow enters the lower drive chamber b, the lower diaphragm squeezes the fluid inward, while the upper diaphragm rebounds outward. Due to manufacturing errors of various parts, the soft valves 1 naturally open alternately. The alternating input of the pulsed airflow between the two drive chambers b allows the two monostable diaphragms 6 to work together in a "push-pull" manner, jointly acting on the single common pumping chamber c.

[0138] The common pumping chamber c is connected to an inlet check valve and an outlet check valve. This series drive design of "dual diaphragm common chamber" allows for more complete volume change in pumping chamber c, significantly increasing the single discharge capacity. Furthermore, the force and flow of the two diaphragms are coupled, which helps to make the output flow more stable.

[0139] It should be noted that the constant pressure airflow is not "artificially switched" into the upper and lower air chambers a, but rather, due to the different opening critical conditions of the two soft valves 1 in the self-excited pneumatic system, the alternating opening behavior is spontaneously formed in time under the same constant pressure air source and the same air path conditions.

[0140] In this embodiment, the two soft valve units have the same structure, but their valve body flexible structure parameters or assembly pre-tightening state have slight differences, so that their corresponding opening critical pressure difference is not completely consistent.

[0141] The flexible structure parameters include the valve lip (cantilever portion) thickness, effective pressure-bearing area, and material elastic modulus. The valve lip thicknesses of the two soft valves 1 can be set to different values ​​to create different critical opening pressure differentials. By changing the contact boundary position between the valve body and the valve seat (i.e., the position where the soft valve 1 is assembled), the effective pressure-bearing area of ​​the valve body is adjusted, thereby changing its opening pressure differential. The two soft valves 1 can be made of elastic materials with different hardness grades to create different critical opening pressure differentials.

[0142] When a constant pressure gas source acts on both soft valve 1 units simultaneously, the soft valve 1 with the smaller critical opening pressure difference will buckle open first, allowing gas to enter the corresponding drive chamber b preferentially. At the same time, the change in system pressure distribution inhibits the other soft valve 1 from meeting its opening conditions (i.e., the opening of this soft valve 1 reduces the overall gas pressure in the gas source channel, preventing the other soft valve 1 from reaching the critical opening pressure, meaning that no gas enters the lower drive chamber b because of the low gas pressure).

[0143] As the gas filling and discharging process in the drive chamber b corresponding to the opened soft valve 1 is completed, the pressure difference across it gradually decreases and it enters the closing stage. The constant pressure gas source will quickly provide gas pressure to the control chamber, but the gas pressure in the drive chamber b decreases slowly, making its pressure difference insufficient to allow it to open again. At this time, the pressure difference across the other soft valve 1 accumulates and reaches its opening critical condition, thus opening. Therefore, under constant pressure gas source conditions, the two soft valves 1 can form a mutually exclusive, alternating self-excited working state in time without external control.

[0144] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A monostable diaphragm pump system based on self-excited pneumatic modulation, characterized in that, include: The soft valve clamp consists of an inner body, an outer body, and a diaphragm clamp, arranged sequentially, forming a central cavity. A soft valve and a monostable diaphragm are provided. The soft valve is installed between the outer body and the inner body of the soft valve fixture, and the monostable diaphragm is installed between the inner body and the diaphragm fixture. The soft valve and the monostable diaphragm divide the central cavity into a gas-capacity cavity, a drive cavity, and a pumping cavity. The gas-capacity cavity is located between the outer body and the soft valve fixture, the drive cavity is located between the soft valve and the monostable diaphragm, and the pumping cavity is located between the monostable diaphragm and the diaphragm fixture. The inner and outer bodies of the soft valve fixture are provided with an inlet and an outlet passage communicating with the gas-capacity cavity. Under the action of external force, the monostable diaphragm can deform and bulge towards the pumping cavity. When the external force is removed or reduced, the monostable diaphragm returns to its original deformation and bulges towards the drive cavity. With gas flowing into the intake duct, the soft valve periodically opens and closes, forming a periodically opening and closing pulsed airflow in the drive chamber, causing the monostable diaphragm to circumferentially and alternately bulge outwards into the pump chamber and drive chamber.

2. The monostable diaphragm pump system based on self-excited pneumatic modulation according to claim 1, characterized in that, The flexible valve includes an elastic valve plate and a skirt disposed around the edge of the elastic valve plate; A slit is made on the elastic valve plate; The skirt is held between the inner body of the soft valve clamp and the outer body of the soft valve clamp; When gas is introduced into the intake duct, if the pressure difference between the gas chamber and the drive chamber is greater than the opening critical pressure difference of the soft valve, the elastic valve plate deforms, opening the gas chamber and the drive chamber. If the pressure difference between the gas chamber and the drive chamber is less than the opening critical pressure difference, the elastic valve plate returns to its original shape, cutting off the gas chamber and the drive chamber.

3. The monostable diaphragm pump system based on self-excited pneumatic modulation according to claim 2, characterized in that, The soft valve clamp has a central through groove, and the exhaust passage includes an exhaust hole opened on the soft valve clamp, which is connected to the central through groove. The soft valve and the monostable diaphragm respectively seal the two ends of the central through groove to form the drive cavity; The air intake includes a first channel section formed on the inner body of the soft valve clamp and a second channel section formed on the outer body of the soft valve clamp. The second channel section communicates with the air chamber. When the inner body and the outer body of the soft valve clamp are connected, the first channel section and the second channel section are connected.

4. The monostable diaphragm pump system based on self-excited pneumatic modulation according to claim 3, characterized in that, Including the first washer; The first washer has a center hole and a side hole; The first washer is pressed between the inner body of the soft valve clamp and the outer body of the soft valve clamp; The central hole avoids and connects the central through groove and the air cavity; The side hole connects the first channel segment and the second channel segment.

5. The monostable diaphragm pump system based on self-excited pneumatic modulation according to claim 1, characterized in that, A throttle valve is installed on the exhaust duct, which can adjust the opening of the exhaust duct.

6. The monostable diaphragm pump system based on self-excited pneumatic modulation according to claim 1, characterized in that, The diaphragm clamp is provided with a limiting part; The limiting part is located in the pumping chamber; When the monostable diaphragm protrudes towards the pumping chamber, it can abut against the limiting portion.

7. The monostable diaphragm pump system based on self-excited pneumatic modulation according to claim 1, characterized in that, The monostable diaphragm has a dome-shaped deformable sheet; The thickness of the dome deformable sheet gradually increases in the direction from the center to the edge.

8. The monostable diaphragm pump system based on self-excited pneumatic modulation according to claim 1, characterized in that, The diaphragm clamp is provided with soft valve clamp inner bodies on both sides along the thickness direction, and the soft valve clamp outer body is provided on the side of the soft valve clamp inner body opposite to the diaphragm clamp. The pumping chamber is formed between two monostable diaphragms in a monostable diaphragm pump system.

9. The monostable diaphragm pump system based on self-excited pneumatic modulation according to claim 8, characterized in that, The opening critical pressure difference of the soft valves located on both sides of the pumping chamber is different; The two air inlets of the monostable diaphragm pump system are connected to the same air source. Under the action of airflow, the two monostable diaphragms alternately bulge and deform toward one side of the pumping chamber.

10. The monostable diaphragm pump system based on self-excited pneumatic modulation according to any one of claims 1-9, characterized in that, An observation window is provided on the inner body of the soft valve clamp and / or the diaphragm clamp, the observation window is connected to the central cavity, and the observation window is closed by a transparent plate.

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