Proportional pressure valve with self-adaptive non-return function

Abstract

The invention relates to the field of pressure valves, in particular to a proportional pressure valve with a self-adaptive non-return function. Comprising a valve body and a valve element, a first outlet and a second outlet which penetrate through the interior of the valve body are formed in the peripheral side of the valve body, a flow channel is formed in the valve element, annular valve cavities communicated with the two outlets are formed between the valve body and the valve element respectively, and a non-return structure is arranged in each annular valve cavity and comprises a fixed valve sleeve and a rotary valve sleeve. An inner hole is formed in the fixed valve sleeve, an outer hole is correspondingly formed in the rotary valve sleeve, a torsional spring is fixedly connected between the rotary valve sleeve and the fixed valve sleeve, and a pressed part is arranged on the outer side of the rotary valve sleeve. Through cooperative action of the rotary valve sleeve and the fixed valve sleeve, the pressed part triggers rotation under countercurrent high pressure to achieve staggered closing between the inner hole and the outer hole, meanwhile, the pressure relief channel is synchronously opened for rapid pressure relief and first-stage non-return, the inner hole and a flow channel are cut off in combination with the pressing ring, and second-stage non-return is conducted; and the stability and the safety of the proportional pressure valve under complex working conditions are improved.

Description

Technical Field

[0001] This invention relates to the field of pressure valves, specifically to a proportional pressure valve with an adaptive check function. Background Technology

[0002] In hydraulic and pneumatic control systems, proportional pressure valves are used to precisely adjust system pressure according to input signals and are widely used in applications requiring high-precision pressure control. Existing proportional pressure valves mainly focus on the linearity and stability of pressure regulation, but under complex operating conditions, especially when the system experiences sudden power outages, sudden load changes, or reverse pressure surges, they generally lack effective backflow protection capabilities, which can easily lead to downstream pressure backflow, causing actuator malfunctions, system pressure fluctuations, or even equipment damage.

[0003] A pressure-regulating and stabilizing pressure-reducing valve, currently disclosed in Chinese Patent Publication No. CN214789233U, includes a valve body, a valve core, and a throttling element. The valve body has a flow channel comprising an inlet section, a sliding section, and an outlet section connected sequentially. The valve core is slidably disposed within the sliding section, with the sliding direction of the valve core being the same as the transmission direction of the sliding section. The transmission direction of the inlet section is perpendicular to the sliding direction of the valve core. The valve core has a connecting hole for connecting the inlet section and the sliding section, with the inlet section located on the sliding trajectory of the connecting hole. The outlet section is located on one side of the transmission direction of the sliding section, with the transmission direction of the outlet section being the same as the transmission direction of the sliding section. The throttling element is located on the side of the valve core opposite to the outlet section.

[0004] According to the aforementioned patent, the valve core is hydraulically driven to slide off the outlet section, thus cutting off the inlet section from the sliding section and providing a backflow prevention function. However, this backflow prevention function relies on the outlet section pressure to push the valve core to move in the opposite direction to cut off the inlet flow. The response speed is affected by downstream pressure changes, exhibiting a lag and making it difficult to quickly block sudden backflow impacts. Therefore, there is a need for a proportional pressure valve that can quickly respond to backflow conditions and possesses an adaptive backflow prevention function. Summary of the Invention

[0005] To address the problems existing in the prior art, a proportional pressure valve with adaptive check function is provided. By coordinating the operation of the rotating valve sleeve and the fixed valve sleeve, the pressure-bearing part is triggered to rotate under high pressure in the reverse flow to achieve misalignment and closure between the inner and outer holes. At the same time, the pressure relief channel is opened simultaneously to quickly relieve pressure and perform primary check function. Combined with the pressure ring to cut off the inner hole and the flow channel, secondary check function is performed, thereby improving the stability and safety of the proportional pressure valve under complex working conditions.

[0006] To address the problems of existing technologies, this invention provides a proportional pressure valve with adaptive check-back function, comprising a valve body and a valve core slidably disposed therein. The valve body has a first outlet and a second outlet extending through its interior. The valve core has a flow channel for switching between the two outlets by movement. An annular valve cavity communicating with the two outlets is formed between the valve body and the valve core. Each annular valve cavity is provided with a check-back structure, comprising a fixed valve sleeve and a rotating valve sleeve. The fixed valve sleeve is coaxially disposed in the annular valve cavity and fixedly connected to the valve body. The rotating valve sleeve is coaxially sleeved on the fixed valve sleeve. The fixed valve sleeve has an inner hole, and the rotating valve sleeve has a corresponding outer hole. The rotating valve sleeve can rotate relative to the fixed valve sleeve. A torsion spring is fixedly connected between the rotating valve sleeve and the fixed valve sleeve. When the inner hole and outer hole are coaxial, the torsion spring is in its initial state without external force. A pressure-receiving part is provided on the outer side of the rotating valve sleeve, corresponding to the outlet. When reverse pressure generated by backflow occurs on the outlet side, the rotating valve sleeve rotates, causing the outer hole and inner hole to misalign and close.

[0007] Preferably, the valve body is provided with a pressure relief channel at the position corresponding to each annular valve cavity. The end of the rotary valve sleeve facing the pressure relief channel is provided with an annular plate whose surface is attached to the inner wall of the annular valve cavity. A pressure relief port is opened on the annular plate. When the rotary valve sleeve rotates to make the pressure relief port connect with the pressure relief channel, the annular valve cavity is in a pressure relief state, forming a first-stage check valve.

[0008] Preferably, the fixed valve sleeve is fitted with two sealing rings that are in close contact with the inner wall of the rotary valve sleeve. The outer wall of the fixed valve sleeve and the inner wall of the rotary valve sleeve are respectively provided with annular grooves for the two sealing rings to be embedded therein. The two sealing rings are symmetrically arranged on both sides of the inner hole to form a bidirectional sealing interface.

[0009] Preferably, the pressure-bearing part is a plate-shaped structure extending axially along the rotary valve sleeve, and the shape of the pressure-bearing part is adapted to the inner wall of the annular valve cavity.

[0010] Preferably, the valve body is provided with a plurality of first outlets and second outlets spaced apart along its circumference, and each rotary valve sleeve is provided with a pressure receiving part at the position corresponding to each outlet, and a flow guiding area matching the corresponding outlet is formed between every two adjacent pressure receiving parts.

[0011] Preferably, the inner wall of the rotary valve sleeve has a plurality of inwardly extending protrusions evenly distributed along its circumference, and the outer wall of the fixed valve sleeve has an arc-shaped groove coaxial with the annular valve cavity at the position corresponding to each protrusion. Each protrusion is slidably engaged in the corresponding arc-shaped groove to form a rotation limiting structure.

[0012] Preferably, the inner side of the fixed valve sleeve is provided with a ring sleeve that is sleeved on the valve core and fixedly connected to the valve body. A sandwich is formed between the fixed valve sleeve and the ring sleeve. A pressure ring and a pressure spring fixedly connected to it are provided in the sandwich. When the pressure ring is pressed in the positive direction, the inner hole and the flow channel are connected to each other. Conversely, the inner hole is in a closed state, forming a two-stage check valve.

[0013] Preferably, the end of the pressure ring facing the flow channel is provided with a piston that slides in cooperation with the inner wall of the fixed valve sleeve and the outer wall of the ring sleeve. The inner wall of the fixed valve sleeve is provided with a step that cooperates with the piston. A sealing ring that is in close contact with the outer wall of the pressure ring is provided on the step. When the piston contacts the step, the inner hole is in a fully open state.

[0014] Preferably, the fixed valve sleeve has an inner hole corresponding to each outlet, and the rotary valve sleeve has an outer hole corresponding to each inner hole.

[0015] Preferably, the valve body is provided with a plurality of pressure relief channels at the position corresponding to each annular valve chamber, and a pressure relief port is provided on the annular plate for each pressure relief channel.

[0016] The advantages of this application compared to the prior art are: 1. This invention achieves adaptive backflow prevention and stable pressure regulation functions of a proportional pressure valve under multi-outlet operating conditions through the coordinated cooperation of the rotating valve sleeve and the fixed valve sleeve within the annular valve cavity. The coordinated layout of the pressure-receiving section and the flow-guiding zone ensures smooth forward flow and rapid response during reverse flow.

[0017] When high pressure flows against the outlet, the pressure acts on the pressure-bearing part, causing the rotary valve sleeve to rotate under the reverse pressure. This achieves rapid misalignment and closure of the outer and inner holes, and together with the two sealing rings, forms a bidirectional sealing barrier, effectively preventing internal and external leakage. This disconnects the annular valve cavity from the flow channel, improving the safety, stability, and service life of the proportional pressure valve under complex operating conditions.

[0018] 2. This invention achieves the effect of relieving pressure in the annular valve cavity when the rotary valve sleeve rotates by coordinating the pressure relief channel and the pressure relief port. When the rotary valve sleeve rotates due to backflow, the annular plate rotates synchronously, aligning and connecting the pressure relief port and the pressure relief channel to form multiple parallel pressure relief paths.

[0019] The circumferential distribution of multiple pressure relief ports and channels increases the flow area, improves pressure relief efficiency, ensures backflow prevention, and prevents the internal pressure of the annular valve cavity from continuously rising. The pressure relief channel is shielded by the fit between the outer circumference of the ring plate and the inner wall of the annular valve cavity. A torsion spring connects the rotating valve sleeve and the fixed valve sleeve, allowing the ring plate to rotate and reset after the back pressure is eliminated, causing the pressure relief ports and channels to re-misalign and seal, automatically restoring flow.

[0020] 3. The present invention moves the pressure ring axially along the fixed valve sleeve, so that when positive pressure is applied to the front end of the pressure ring, it pushes the ring to move and make the piston fit with the step. At this time, the inner hole is connected to the flow channel, realizing full-open pressure supply.

[0021] When backflow at the outlet causes pressure reversal, the flow channel stops supplying pressure, the pressure spring pushes the pressure ring to reset, and closes the connection between the inner hole and the flow channel. This creates a secondary check valve based on the primary check valve, achieving deep blockage of the internal flow channel, effectively preventing backflow and improving the check valve effect of the proportional pressure valve, ensuring long-term stable operation. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a proportional pressure valve with adaptive backflow prevention function according to the present invention.

[0023] Figure 2 This is a partial three-dimensional structural cross-sectional view of a proportional pressure valve with adaptive anti-reverse function according to the present invention.

[0024] Figure 3 This is a partial planar sectional view of the valve body, valve core, and check structure of a proportional pressure valve with adaptive check function according to the present invention.

[0025] Figure 4 This is a partial three-dimensional cross-sectional view of the valve body, valve core, and check structure of a proportional pressure valve with adaptive check function according to the present invention. Figure 1 .

[0026] Figure 5 This is a partial three-dimensional cross-sectional view of the valve body, valve core, and check structure of a proportional pressure valve with adaptive check function according to the present invention. Figure 2 .

[0027] Figure 6 This is a three-dimensional structural diagram of the check structure of a proportional pressure valve with adaptive check function according to the present invention.

[0028] Figure 7 This is a three-dimensional exploded view of the check structure of a proportional pressure valve with adaptive check function according to the present invention.

[0029] Figure 8 This is a partial three-dimensional cross-sectional view of the valve body, valve core, and check structure of a proportional pressure valve with adaptive check function according to the present invention. Figure 3 .

[0030] Figure 9 This is a partial three-dimensional cross-sectional view of the check-back structure of a proportional pressure valve with adaptive check-back function according to the present invention.

[0031] Figure 10This is a planar sectional view of the check-back structure of a proportional pressure valve with adaptive check-back function according to the present invention.

[0032] The following are the labels in the diagram: 1. Valve body; 11. First outlet; 12. Second outlet; 2. Valve core; 21. Flow channel; 22. Annular valve cavity; 221. Pressure relief channel; 23. Tension spring; 24. Electromagnetic actuator; 241. Electromagnetic push rod; 3. Check valve structure; 31. Fixed valve sleeve; 311. Inner hole; 312. Sealing ring; 313. Arc groove; 32. Rotary valve sleeve; 321. Outer hole; 322. Pressure-bearing part; 323. Ring plate; 3231. Pressure relief port; 324. Protrusion; 33. Torsion spring; 4. Ring sleeve; 41. Pressure ring; 411. Piston; 412. Sealing ring; 42. Compression spring. Detailed Implementation

[0033] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0034] See Figures 1-5 As shown, a proportional pressure valve with adaptive check function includes a valve body 1 and a valve core 2 slidably disposed therein. The valve body 1 has a first outlet 11 and a second outlet 12 penetrating its interior. The valve core 2 has a flow channel 21 for switching between the two outlets by movement. Annular valve cavities 22 communicating with the two outlets are formed between the valve body 1 and the valve core 2. Each annular valve cavity 22 is provided with a check structure 3, which includes a fixed valve sleeve 31 and a rotating valve sleeve 32. The fixed valve sleeve 31 is coaxially disposed in the annular valve cavity 22 and fixedly connected to the valve body 1, while the rotating valve sleeve 32 is coaxially sleeved on the fixed valve sleeve 31. The fixed valve sleeve 31 has an inner hole 311, and the rotating valve sleeve 32 has a corresponding outer hole 321. The rotating valve sleeve 32 can rotate relative to the fixed valve sleeve 31. A torsion spring 33 is fixedly connected between the rotating valve sleeve 32 and the fixed valve sleeve 31. When the inner hole 311 and the outer hole 321 are coaxial, the torsion spring 33 is in an initial state without external force. The outer side of the rotating valve sleeve 32 is provided with a pressure-receiving part 322, which is provided corresponding to the outlet. When the reverse pressure generated by the backflow on the outlet side acts on the pressure-receiving part 322, the rotating valve sleeve 32 is in a rotating state, causing the outer hole 321 and the inner hole 311 to be misaligned and closed.

[0035] A tension spring 23 is provided between the valve core 2 and the valve body 1. When the flow channel 21 is connected to the first outlet 11, the tension spring 23 is in an uncompressed initial state, while when the flow channel 21 is connected to the second outlet 12, the tension spring 23 is in a stretched state.

[0036] The valve body 1 is provided with an electromagnetic actuator 24 for driving the valve core 2 to move. The electromagnetic actuator 24 has an electromagnetic push rod 241 that abuts against the valve core 2.

[0037] When the proportional pressure valve is in operation, its core action is driven by the electromagnetic actuator 24 to slide axially within the valve body 1, switching between the flow channel 21 and different outlets. Simultaneously, the elastic action of the tension spring 23 ensures the stability of the valve core 2's movement and the reliability of its reset. The specific working process is as follows: First, in the initial state, assume that the valve core 2 is positioned to connect the flow channel 21 with the first outlet 11. At this time, the electromagnetic actuator 24 is not energized, the electromagnetic push rod 241 does not apply any force, and the valve core 2 remains stable in the preset initial position inside the valve body 1. Fluid enters the flow channel 21 inside the valve core 2 from the inlet section, connects with the annular valve chamber 22 corresponding to the first outlet 11 via the flow channel 21, and then flows to the execution circuit connected to the first outlet 11. Since the flow channel 21 is connected to the first outlet 11 at this time, the fluid flows smoothly, and the system is pressurized normally.

[0038] When the control system issues a switching command, requesting the pressure output to be switched from the first outlet 11 to the second outlet 12, the electromagnetic actuator 24 receives an electrical signal, and the electromagnetic push rod 241 generates an axial thrust, pushing the valve core 2 towards the second outlet 12. As the valve core 2 begins to slide, its internal flow channel 21 gradually disengages from the first outlet 11 and moves closer to the second outlet 12. During this process, the tension spring 23 is gradually stretched and enters a stretched state. As the valve core 2 continues to move, the flow channel 21 is completely disconnected from the first outlet 11. When the valve core 2 reaches the target position and the flow channel 21 is fully connected to the second outlet 12, the electromagnetic push rod 241 maintains the thrust to keep the valve core 2 positioned, ensuring a stable connection.

[0039] When the valve core 2 is in any position and the flow channel 21 is connected to the first outlet 11 or the second outlet 12, the fluid flows in the forward direction, the torsion spring 33 is in the initial state, the outer hole 321 and the inner hole 311 are coaxially aligned, the fluid passes smoothly, and normal pressure is achieved.

[0040] However, when a reverse high pressure occurs on one of the outlet sides due to a power outage, sudden load change, or external pressure interference, the countercurrent fluid immediately acts on the pressure-bearing part 322 of the rotary valve sleeve 32 at the corresponding outlet, generating radial thrust and driving the rotary valve sleeve 32 to rotate against the preload of the torsion spring 33. As the rotary valve sleeve 32 rotates, its outer hole 321 gradually misaligns with the inner hole 311 on the fixed valve sleeve 31 until it is completely closed, blocking the countercurrent medium from entering the valve core 2 and achieving rapid flow control.

[0041] Once the external back pressure is eliminated, the torsion spring 33 releases its stored energy, causing the rotary valve sleeve 32 to rotate and reset, realigning the outer hole 321 with the inner hole 311 and restoring the flow state. The entire check valve process requires no external control and is entirely driven by fluid pressure, resulting in rapid response and reliable operation, thus achieving adaptive check valve protection.

[0042] See Figures 3-8 As shown, the valve body 1 is provided with a pressure relief channel 221 at the position corresponding to each annular valve cavity 22. The end of the rotary valve sleeve 32 facing the pressure relief channel 221 is provided with an annular plate 323 whose surface is attached to the inner wall of the annular valve cavity 22. The annular plate 323 is provided with a pressure relief port 3231. When the rotary valve sleeve 32 rotates and the pressure relief port 3231 is connected to the pressure relief channel 221, the annular valve cavity 22 is in a pressure relief state, forming a first-stage check valve.

[0043] When backflow occurs at one of the outlet sides, the reverse pressure acts on the pressure-receiving part 322 on the outside of the rotary valve sleeve 32, driving it to rotate relative to the fixed valve sleeve 31. As the rotary valve sleeve 32 rotates, the annular plate 323 at its end rotates synchronously, and the pressure relief port 3231, which was originally covered by the annular plate 323, gradually moves towards and eventually aligns with and connects with the pressure relief channel 221 on the valve body 1.

[0044] Once the pressure relief port 3231 is connected to the pressure relief channel 221, the reverse pressure fluid in the annular valve chamber 22 is quickly discharged through this channel, achieving active pressure relief. This effectively reduces the pressure inside the annular valve chamber 22, preventing damage to the valve core 2 due to high pressure backflow and ensuring its normal operation.

[0045] After the pressure relief is completed, when the external reverse pressure disappears, the torsion spring 33 returns to its initial state, causing the rotary valve sleeve 32 to rotate in the opposite direction. The ring plate 323 then rotates back, causing the pressure relief port 3231 to be misaligned with the pressure relief channel 221 again, achieving sealing and isolation once more, and the system returns to normal flow. The entire pressure relief process is automatically triggered by fluid pressure, requiring no external intervention, and features rapid response and high reliability.

[0046] See Figures 3-5 and Figure 9 As shown, the fixed valve sleeve 31 is fitted with two sealing rings 312 that are in close contact with the inner wall of the rotary valve sleeve 32. The outer wall of the fixed valve sleeve 31 and the inner wall of the rotary valve sleeve 32 are respectively provided with annular grooves for the two sealing rings 312 to be embedded therein. The two sealing rings 312 are symmetrically arranged on both sides of the inner hole 311 to form a bidirectional sealing interface.

[0047] Under forward or reverse flow conditions, the sealing ring 312 achieves a sealing effect between the fixed valve sleeve 31 and the rotating valve sleeve 32.

[0048] The symmetrically arranged double-sealing structure forms a reliable sealing barrier regardless of whether the fluid is in a forward-flowing or reverse-attempting state, effectively preventing fluid leakage in the gap between the fixed valve sleeve 31 and the rotary valve sleeve 32. This not only improves the sealing reliability of the check valve structure 3, but also extends the service life of the rotary valve sleeve 32 under frequent opening and closing conditions, ensuring long-term stable operation under normal conditions and the adaptive check valve function.

[0049] See Figures 6-10 As shown, the pressure-bearing part 322 is a plate-shaped structure extending axially along the rotary valve sleeve 32, and the shape of the pressure-bearing part 322 is adapted to the inner wall of the annular valve cavity 22.

[0050] The outer contour of the pressure-receiving part 322 is matched to the shape of the inner wall of the annular valve cavity 22, and its outer side is in contact with the inner wall of the annular valve cavity 22. In the assembled state, the outer side of the pressure-receiving part 322 and the inner wall of the annular valve cavity 22 maintain a uniform and tight sliding fit without obvious gaps, ensuring that the fluid cannot flow around from the side and improving the pressure transmission efficiency.

[0051] When backflow occurs on the outlet side, the reverse-flowing fluid directly impacts the plate-like surface of the pressure-receiving part 322. Due to its axial extension and shape adapted to the inner wall of the annular valve cavity 22, the pressure-receiving part 322 can effectively intercept and fully receive the instantaneous high pressure of the fluid, converting the fluid pressure into a torque that drives the rotary valve sleeve 32 to rotate around its central axis.

[0052] During forward flow, the fluid flows out from the flow channel 21 inside the valve core 2, first entering the inner hole 311 on the fixed valve sleeve 31, then passing through the outer hole 321 on the aligned rotating valve sleeve 32, and finally entering the annular valve cavity 22 and flowing out from the outlet. Throughout the process, the fluid flows from the inside to the outside, with its main direction being radially outward. The pressure-bearing part 322 is located on the outer circumferential surface of the rotating valve sleeve 32. At this time, the fluid is already in a stable and diffused state after passing through the outer hole 321, and the pressure acts uniformly on the valve cavity space, generating almost symmetrical static pressure on both sides of the pressure-bearing part 322. It is impossible to form an effective pressure difference or tangential force, so no rotational torque is generated on the rotating valve sleeve 32.

[0053] When backflow occurs, the reverse fluid enters the annular valve cavity 22 from the outlet, flowing from the outside in. It first directly impacts the pressure-bearing portion 322 on the outer periphery of the rotary valve sleeve 32. The pressure-bearing portion 322 is an axially extending plate-like structure, with its outer surface tightly fitted against the inner wall of the annular valve cavity 22, forming a protruding baffle facing the incoming flow. At this moment, the high-pressure backflow acts on the incoming surface of the pressure-bearing portion 322 the instant it enters the valve cavity, while its outgoing surface, not yet filled with fluid or with lower pressure, creates a significant pressure difference. This pressure difference, applied at a position off-center from the rotation center, generates sufficient tangential torque, thereby driving the rotary valve sleeve 32 to rotate against the resistance of the torsion spring 33.

[0054] See Figures 6-10 As shown, the valve body 1 is provided with a plurality of first outlets 11 and second outlets 12 spaced apart along its circumference. Each rotary valve sleeve 32 is provided with a pressure receiving part 322 at the position corresponding to each outlet. A guide zone matching the corresponding outlet is formed between every two adjacent pressure receiving parts 322.

[0055] In the forward operating state, the fluid enters the guide zone through the inner hole 311 and the outer hole 321, and then flows out through the corresponding outlet. The guide zone provides a low-resistance flow path for the fluid, ensuring uniform flow distribution and stable pressure when multiple outlets are operating simultaneously or alternately.

[0056] Meanwhile, the presence of the flow guide zone ensures that the pressure-bearing part 322 is only activated when backflow occurs at its corresponding outlet. Even if a high-pressure backflow occurs in a flow guide zone, it will drive the rotary valve sleeve 32 to rotate, thereby improving the accuracy and rapid response of the backflow prevention control.

[0057] See Figure 7 , Figure 8 and Figure 10 As shown, the inner wall of the rotary valve sleeve 32 is evenly distributed with multiple inwardly extending protrusions 324 along its circumference. The outer wall of the fixed valve sleeve 31 is provided with an arc-shaped groove 313 coaxial with the annular valve cavity 22 at the position corresponding to each protrusion 324. Each protrusion 324 is slidably engaged in the corresponding arc-shaped groove 313 to form a rotation limiting structure.

[0058] When the rotary valve sleeve 32 rotates relative to the fixed valve sleeve 31, multiple protrusions 324 evenly distributed circumferentially on its inner wall move synchronously. Each protrusion 324 slides within a corresponding arcuate groove 313 on the outer wall of the fixed valve sleeve 31, moving along the arcuate trajectory of the groove. As the rotation continues, the protrusions 324 slide within the arcuate groove 313, restricting the rotary valve sleeve 32 to rotate only within the angle range defined by the arcuate groove 313, preventing its continuous rotation from damaging the torsion spring 33.

[0059] When the protrusion 324 slides to the end of the arc-shaped groove 313, it contacts and is blocked by the groove wall, and the rotational motion stops immediately. At this time, the rotary valve sleeve 32 reaches its maximum rotation angle. This ensures that the rotary valve sleeve 32 can stably and controllably close the inner hole 311 in response to counterflow pressure.

[0060] The pressure relief port 3231 is an arc-shaped opening circumferentially formed along the ring plate 323, with an arc length greater than the arc length corresponding to the minimum rotation angle required for the rotary valve sleeve 32 to achieve backflow prevention. Therefore, in the initial stage of rotation of the rotary valve sleeve 32, as long as its rotation angle reaches the point where the edge of the pressure relief port 3231 aligns with the edge of the pressure relief channel 221 on the valve body 1, a passage is formed between them, and pressure relief begins. This means that the rotary valve sleeve 32 does not need to be fully rotated to its limit position; as long as the backflow pressure is sufficient to drive it to produce a small rotation angle, the pressure relief port 3231 can open, quickly releasing the backflow pressure in the annular valve chamber 22.

[0061] See Figure 4 , Figure 5 and Figure 9 As shown, a ring sleeve 4 is provided on the inner side of the fixed valve sleeve 31, which is sleeved on the valve core 2 and fixedly connected to the valve body 1. An interlayer is formed between the fixed valve sleeve 31 and the ring sleeve 4. A pressure ring 41 and a pressure spring 42 fixedly connected to it are provided in the interlayer. When the pressure ring 41 is pressed in the positive direction, the inner hole 311 is connected to the flow channel 21. Conversely, the inner hole 311 is in the closed state, forming a two-stage check valve.

[0062] When the fluid flows forward from the flow channel 21 of the valve core 2, the pressure acts on the front end of the pressure ring 41, pushing the pressure ring 41 to overcome the elastic force of the pressure spring 42 and move into the inner layer until the inner hole 311 on the fixed valve sleeve 31 is connected to the flow channel 21 of the valve core 2, the fluid passes through smoothly, and the system is pressurized normally.

[0063] When backflow occurs on the outlet side, the rotation of the rotary valve sleeve 32 causes the outer hole 321 to misalign with the inner hole 311, the flow channel 21 stops supplying pressure, the pressure spring 42 releases its stored energy, and pushes the pressure ring 41 to move in the opposite direction, re-closing the connection between the inner hole 311 and the flow channel 21. Based on the first-level backflow prevention achieved by the rotary valve sleeve 32, the internal flow channel 21 is further blocked, forming an independently responsive second-level backflow prevention protection.

[0064] See Figure 4 , Figure 5 and Figure 9 As shown, the end of the pressure ring 41 facing the flow channel 21 is provided with a piston 411 that slides with the inner wall of the fixed valve sleeve 31 and the outer wall of the ring sleeve 4. The inner wall of the fixed valve sleeve 31 is provided with a step that cooperates with the piston 411. A sealing ring 412 that is in close contact with the outer wall of the pressure ring 41 is provided on the step. When the piston 411 contacts the step, the inner hole 311 is in a fully open state.

[0065] When fluid enters from the flow channel 21 of valve core 2 and acts on the front end of pressure ring 41, the pressure pushes pressure ring 41 to move into the interlayer, and piston 411 at its front end slides accordingly, advancing inward along the gap between the inner wall of fixed valve sleeve 31 and the outer wall of ring sleeve 4, compressing pressure spring 42 to store energy. During this process, piston 411 and pressure ring 41 as a whole maintain stable guidance and sealing.

[0066] When the pressure ring 41 moves to the set position, the end face of the piston 411 is fully attached to and in contact with the sealing ring 412 on the step. At this time, the inner hole 311 and the flow channel 21 are fully aligned and in the fully open state. At the same time, the sealing ring 412 on the step is tightly attached to the outer wall of the pressure ring 41 to form a circumferential seal, preventing fluid from leaking from the outer periphery of the pressure ring 41 to the interlayer.

[0067] See Figure 3 , Figure 4 and Figures 6-9 As shown, the fixed valve sleeve 31 has an inner hole 311 for each outlet, and the rotating valve sleeve 32 has an outer hole 321 for each inner hole 311.

[0068] Multiple inner holes 311 are opened on the fixed valve sleeve 31 corresponding to each outlet, and multiple outer holes 321 are set on the rotating valve sleeve 32 accordingly. This can increase the fluid flow area, improve the flow output capacity per unit time, effectively reduce the pressure loss and flow velocity impact when the fluid passes through, improve the flow uniformity, and reduce cavitation and vibration.

[0069] The symmetrical arrangement of multiple holes also makes the hydraulic pressure distribution on the rotary valve sleeve 32 more even, reducing off-center load and improving the smoothness of movement. During the check valve action, multiple outer holes 321 and inner holes 311 close synchronously and in a staggered manner, enhancing the sealing reliability. Even if there is a small gap in a single hole, the remaining holes can still maintain a seal, improving the safety of the check valve.

[0070] See Figure 3 , Figure 4 and Figures 6-10 As shown, the valve body 1 is provided with a plurality of pressure relief channels 221 at the position corresponding to each annular valve chamber 22, and the annular plate 323 is provided with a pressure relief port 3231 corresponding to each pressure relief channel 221.

[0071] When the rotary valve sleeve 32 rotates due to reverse flow, its end ring plate 323 rotates synchronously, and the multiple pressure relief ports 3231 opened on the ring plate 323 move accordingly, respectively aligning and connecting with the multiple pressure relief channels 221 correspondingly provided on the valve body 1, forming multiple parallel pressure relief paths.

[0072] The corresponding arrangement of multiple pressure relief ports 3231 and multiple pressure relief channels 221 increases the pressure relief area and flow capacity, enabling the reverse pressure in the annular valve cavity 22 to be discharged simultaneously through multiple pressure relief channels 221 in a very short time, accelerating the pressure relief response speed, effectively avoiding pressure relief delay caused by local blockage or insufficient flow cross section, and enhancing the reliability and dynamic performance of the backflow prevention function.

[0073] This invention achieves an adaptive response to backflow through the coordinated operation of the rotating valve sleeve 32 and the fixed valve sleeve 31 within the annular valve cavity 22. The layout of the pressure-bearing part 322 and the flow-guiding area ensures smooth and undisturbed forward flow, while triggering action quickly when backflow occurs. This causes the rotating valve sleeve 32 to rotate and drive the outer hole 321 and the inner hole 311 to close in a misaligned manner, while simultaneously forming a reliable seal with the double sealing rings 312.

[0074] After the rotary valve sleeve 32 rotates, the synchronously opening multi-arc pressure relief ports 3231 and pressure relief channels 221 achieve rapid and active pressure relief, preventing pressure accumulation and improving response speed and safety. Simultaneously, the flow channel 21 stops supplying pressure after backflow occurs, causing the pressure ring 41 to cut off the inner hole 311 from the flow channel 21 under the action of the pressure spring 42, forming a two-stage check valve and enhancing its reliability. The overall structure achieves rapid check valve performance without external control, improving the operational stability, safety, and service life of the proportional pressure valve under frequent pressure fluctuations and complex operating conditions.

[0075] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A proportional pressure valve with adaptive check function, comprising a valve body and a valve core slidably disposed therein, wherein a first outlet and a second outlet are provided on the periphery of the valve body and the valve core is provided with a flow channel for switching between the two outlets by moving. Its features are, An annular valve cavity is formed between the valve body and the valve core, which communicates with the two outlets respectively; Each annular valve chamber is provided with a check valve structure, which includes a fixed valve sleeve and a rotating valve sleeve. The fixed valve sleeve is coaxially arranged in the annular valve chamber and fixedly connected to the valve body, and the rotating valve sleeve is coaxially sleeved on the fixed valve sleeve. The fixed valve sleeve has an inner hole, and the rotating valve sleeve has a corresponding outer hole. The rotary valve sleeve can rotate relative to the fixed valve sleeve. A torsion spring is fixedly connected between the rotary valve sleeve and the fixed valve sleeve. When the inner hole and the outer hole are coaxial, the torsion spring is in the initial state where it is not subjected to external force. The outer side of the rotary valve sleeve is provided with a pressure-receiving part, which is located corresponding to the outlet. When the reverse pressure generated by the backflow on the outlet side acts on the pressure-receiving part, the rotary valve sleeve is in a rotating state, causing the outer hole and inner hole to be misaligned and closed.

2. A proportional pressure valve with adaptive check function according to claim 1, characterized in that, Each annular valve cavity is provided with a pressure relief channel on the valve body. The end of the rotary valve sleeve facing the pressure relief channel is provided with an annular plate whose surface is attached to the inner wall of the annular valve cavity. A pressure relief port is opened on the annular plate. When the rotary valve sleeve rotates and the pressure relief port is connected to the pressure relief channel, the annular valve cavity is in a pressure relief state, forming a first-stage check valve.

3. A proportional pressure valve with adaptive check function according to claim 2, characterized in that, The fixed valve sleeve is fitted with two sealing rings that are in close contact with the inner wall of the rotary valve sleeve. The outer wall of the fixed valve sleeve and the inner wall of the rotary valve sleeve are respectively provided with annular grooves for the two sealing rings to be embedded therein. The two sealing rings are symmetrically arranged on both sides of the inner hole to form a bidirectional sealing interface.

4. A proportional pressure valve with adaptive check function according to claim 1, characterized in that, The pressure-bearing part is a plate-shaped structure extending axially along the rotary valve sleeve, and the shape of the pressure-bearing part is adapted to the inner wall of the annular valve cavity.

5. A proportional pressure valve with adaptive check function according to claim 4, characterized in that, The valve body is provided with multiple first outlets and second outlets spaced apart along its circumference. Each rotary valve sleeve is provided with a pressure receiving part at the position corresponding to each outlet. A flow guiding area matching the corresponding outlet is formed between every two adjacent pressure receiving parts.

6. A proportional pressure valve with adaptive check function according to claim 5, characterized in that, The inner wall of the rotary valve sleeve has multiple inwardly extending protrusions evenly distributed along its circumference. The outer wall of the fixed valve sleeve has an arc-shaped groove coaxial with the annular valve cavity at the position of each protrusion. Each protrusion is slidably engaged in the corresponding arc-shaped groove to form a rotation limiting structure.

7. A proportional pressure valve with adaptive check function according to claim 1, characterized in that, The fixed valve sleeve has a ring sleeve on the inside, which is fitted on the valve core and fixedly connected to the valve body. A sandwich is formed between the fixed valve sleeve and the ring sleeve. A pressure ring and a pressure spring fixedly connected to it are provided in the sandwich. When the pressure ring is pressed in the positive direction, the inner hole and the flow channel are connected to each other. Conversely, the inner hole is closed, forming a two-stage check valve.

8. A proportional pressure valve with adaptive check function according to claim 7, characterized in that, The end of the pressure ring facing the flow channel is provided with a piston that slides in cooperation with the inner wall of the fixed valve sleeve and the outer wall of the ring sleeve. The inner wall of the fixed valve sleeve is provided with a step that cooperates with the piston. A sealing ring that is in close contact with the outer wall of the pressure ring is provided on the step. When the piston contacts the step, the inner hole is in a fully open state.

9. A proportional pressure valve with adaptive check function according to claim 5, characterized in that, The fixed valve sleeve has an inner hole corresponding to each outlet, and the rotary valve sleeve has an outer hole corresponding to each inner hole.

10. A proportional pressure valve with adaptive check function according to claim 2, characterized in that, The valve body is provided with multiple pressure relief channels at the position corresponding to each annular valve chamber, and a pressure relief port is provided on the annular plate for each pressure relief channel.

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