A structure for an anti-jamming overflow valve suitable for high-viscosity media

Abstract

This utility model relates to the field of overflow valve technology, and in particular to an anti-jamming overflow valve structure suitable for high-viscosity media. It includes an overflow valve body, a valve cover fixedly connected to the top of the valve body, a valve cap fixedly connected to the top of the valve cover, a valve stem disposed on the inner top of the valve cap, and a valve core connected to the bottom of the valve stem via a connecting spring. This overflow valve, by combining guide vanes, a central shaft, and a hollow guide hole, utilizes the kinetic energy of the high-viscosity medium flow to drive the guide vanes to rotate, causing the central shaft to rotate synchronously. This creates a dynamic gap between the central shaft and the hollow guide hole, eliminating the frictional resistance caused by the sliding fit of the traditional fixed guide ring. The high-speed rotation of the central shaft causes the medium within the gap to form a circumferential shear flow, generating a dynamic pressure effect to form a uniform fluid lubrication film, significantly reducing the axial movement frictional resistance of the valve core and effectively solving the valve core jamming problem caused by the adhesion and sliding friction of high-viscosity media in traditional overflow valves.

Description

Technical Field

[0001] This utility model relates to the field of overflow valve technology, and in particular to an anti-jamming overflow valve structure suitable for high viscosity media. Background Technology

[0002] In industrial production, relief valves, as important pressure control components in hydraulic systems, play a crucial role in maintaining system pressure stability and protecting system safety. However, when relief valves are used with high-viscosity media (such as heavy oil, asphalt, and high-viscosity polymer melts), the traditional relief valve structure reveals many problems, seriously affecting its normal operating performance.

[0003] In existing traditional relief valves, the valve core is typically guided by a fixed guide ring and a sliding fit between the guide ring and the valve core. However, high-viscosity media have poor flowability and tend to adhere to the mating surfaces of the guide ring and the valve core. This increases sliding friction resistance, making the valve core prone to jamming during opening and closing, and unable to respond promptly to changes in system pressure. Furthermore, tiny particulate impurities in the media can easily accumulate in the mating gaps, further exacerbating the jamming and even causing the valve core to seize up, rendering the relief valve ineffective in pressure control.

[0004] Meanwhile, the sealing structure of traditional relief valves is usually a fixed-gap sealing form, which is difficult to adapt to the dynamic changes in the viscous resistance of high-viscosity media. When the viscosity of the medium increases, the viscous frictional resistance of the sealing part increases significantly, the valve core movement resistance is too large, and it is very easy to get stuck; while when the viscosity of the medium decreases, the original sealing gap will lead to media leakage, making it impossible to ensure the stability of system pressure. It is difficult to achieve a good balance between sealing performance and valve core movement flexibility, thus failing to meet the requirements of high-viscosity media systems for stable and reliable operation of relief valves. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an anti-jamming overflow valve structure suitable for high-viscosity media.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An anti-jamming overflow valve structure suitable for high viscosity media includes an overflow valve body, a valve cover fixedly connected to the top of the overflow valve body, a valve cap fixedly connected to the top of the valve cover, a valve stem provided on the inner top of the valve cap, a valve core connected to the bottom of the valve stem by a connecting spring, and a hollow guide hole opened at the bottom of the valve core. An annular bearing seat is fixedly connected to the inner bottom of the overflow valve body. A central shaft is connected to the inside of the annular bearing seat through the inner ring of the bearing. A guide vane is connected to the outer surface of one end of the central shaft through a hub, and the other end extends into the inside of the valve core and is connected to the inner wall of the valve core.

[0007] Preferably, the hole wall of the hollow guide hole mates with the central shaft to form a shaft-hole guide pair, and a fitting clearance of 0.1-0.2mm is formed between the shaft-hole guide pairs, which forms a cleaning cavity; The cleaning chamber has a spiral oil return groove in its wall. An annular oil collection groove is fixedly connected to the outer surface of the central shaft and the bottom of the valve core. The lower end of the spiral oil return groove extends into the interior of the annular oil collection groove. A radial through hole is provided on the annular oil collection groove, and the radial through hole communicates with the interior of the overflow valve body.

[0008] Preferably, the valve core has a sealing groove on its inner wall, and a sealing ring is provided inside the sealing groove. A ring-shaped permanent magnet is embedded in the circumference of the sealing ring. The ring-shaped permanent magnet is distributed radially, with the outer ring having the N pole and the inner ring having the S pole.

[0009] Preferably, the sealing ring is based on polytetrafluoroethylene, has an overall O-shaped and lip-shaped composite structure, and is filled with carbon fiber.

[0010] Preferably, a valve sleeve is fitted over the valve core, and an annular mounting groove is formed on the inner wall of the valve sleeve corresponding to the position of the sealing ring. A miniature electromagnet is embedded in the annular mounting groove along the circumferential direction, and a flexible heat insulation pad is filled between the miniature electromagnet and the annular mounting groove.

[0011] Preferably, miniature Hall sensors are symmetrically embedded in the inner walls of the valve core located on the upper and lower sides of the sealing ring, and the probes of the miniature Hall sensors correspond to miniature electromagnets.

[0012] Preferably, the overflow valve body has an oil inlet channel and an oil outlet channel on both sides of its surface. The oil inlet channel and the oil outlet channel are connected to the interior of the overflow valve body. A viscosity sensor is embedded in the inner wall of the oil inlet channel.

[0013] Preferably, a controller is provided on the outside of the overflow valve body, an electromagnetic coil is wound on the outer surface of the miniature electromagnet, and the electromagnetic coil, the miniature Hall sensor, and the viscosity sensor are all electrically connected to the controller through a feedback control loop.

[0014] The beneficial effects of this utility model are: This relief valve combines guide vanes, a central shaft, and a hollow guide hole. It utilizes the kinetic energy of the high-viscosity medium to drive the guide vanes to rotate, which in turn drives the central shaft to rotate synchronously, creating a dynamic gap between the central shaft and the hollow guide hole. On one hand, this dynamic gap constrains the radial position of the valve core through the medium, preventing valve core eccentricity and eliminating direct sliding contact, thus eliminating the frictional resistance caused by the sliding fit of traditional fixed guide rings. On the other hand, the high-speed rotation of the central shaft causes the medium within the gap to form a circumferential shear flow, generating a dynamic pressure effect that forms a uniform fluid lubrication film. This film isolates the central shaft from the wall of the hollow guide hole, significantly reducing the axial movement frictional resistance of the valve core. This ensures that the valve core can still open and close flexibly in high-viscosity media, effectively solving the valve core jamming problem caused by the adhesion and sliding friction of high-viscosity media in traditional relief valves.

[0015] This relief valve is equipped with a viscosity sensor, a miniature Hall sensor, a controller, a miniature electromagnet, and sealing ring components. When the viscosity of the medium changes, the viscosity sensor monitors the viscosity, the miniature Hall sensor detects the sealing gap in real time, and the controller adjusts the current of the miniature electromagnet based on the signal, changing the magnetic field interaction between the sealing ring and the valve sleeve to achieve adaptive adjustment of the sealing gap. When the medium viscosity increases, the sealing gap increases to reduce viscous frictional resistance, ensuring flexible valve core movement and utilizing the viscous seal of the high-viscosity medium to prevent leakage. When the medium viscosity decreases, the sealing gap decreases to ensure sealing performance and prevent leakage. This solves the contradiction between the fixed sealing gap of traditional relief valves and the difficulty in balancing sealing performance and valve core movement flexibility, enabling the relief valve to operate stably and reliably under high-viscosity medium conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an anti-jamming overflow valve structure suitable for high-viscosity media proposed in this utility model; Figure 2 This is a cross-sectional structural diagram of an anti-jamming overflow valve structure suitable for high-viscosity media proposed in this utility model; Figure 3 This utility model proposes an anti-jamming overflow valve structure suitable for high-viscosity media. Figure 2 A magnified structural diagram of point A in the middle; Figure 4 This utility model proposes an anti-jamming overflow valve structure suitable for high-viscosity media. Figure 2 A magnified structural diagram of point B in the middle.

[0017] In the picture: 1. Overflow valve body; 2. Valve cover; 3. Valve cap; 4. Valve stem; 401. Connecting spring; 402. Valve core; 403. Hollow guide hole; 5. Annular bearing seat; 501. Inner bearing ring; 502. Central shaft; 503. Guide vane; 6. Cleaning chamber; 601. Spiral oil return groove; 602. Annular oil collection groove; 603. Radial through hole; 7. Sealing groove; 701. Sealing ring; 702. Annular permanent magnet; 8. Valve sleeve; 801. Miniature electromagnet; 802. Flexible heat insulation pad; 9. Miniature Hall sensor; 10. Oil inlet channel; 101. Viscosity sensor; 11. Oil outlet channel. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0020] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0021] Example 1: Reference Figures 1-4 An anti-jamming overflow valve structure suitable for high viscosity media includes an overflow valve body 1. The overflow valve body 1 is characterized in that a valve cover 2 is fixedly connected to the top of the overflow valve body 1, a valve cap 3 is fixedly connected to the top of the valve cover 2, a valve stem 4 is provided on the inner top of the valve cap 3, a valve core 402 is connected to the bottom of the valve stem 4 through a connecting spring 401, and a hollow guide hole 403 is provided at the bottom of the valve core 402. An annular bearing seat 5 is fixedly connected to the inner bottom of the overflow valve body 1. A central shaft 502 is connected to the inside of the annular bearing seat 5 through the inner ring 501 of the bearing. A guide vane 503 is connected to the outer surface of one end of the central shaft 502 through a hub, and the other end extends into the inside of the valve core 402 and is connected to the inner wall of the valve core 402.

[0022] The wall of the hollow guide hole 403 mates with the central shaft 502 to form a shaft-hole guide pair, and a fitting clearance of 0.1-0.2mm is formed between the shaft-hole guide pairs, which forms the cleaning cavity 6. The wall of the cleaning chamber 6 is provided with a spiral oil return groove 601. An annular oil collection groove 602 is fixedly connected to the outer surface of the central shaft 502 and located at the bottom of the valve core 402. The lower end of the spiral oil return groove 601 extends into the interior of the annular oil collection groove 602. A radial through hole 603 is provided on the annular oil collection groove 602. The radial through hole 603 communicates with the interior of the overflow valve body 1.

[0023] In this embodiment, during the start-up and operation of the overflow valve body 1, when the high-viscosity medium enters the overflow valve body 1 from the oil inlet channel 10, the medium is in a flowing state. When the medium flows through the guide vane 503, its flow kinetic energy drives the guide vane 503 to rotate at high speed. Since the flow velocity of the medium is positively correlated with the rotation speed of the guide vane 503, the rotation of the guide vane 503 synchronously drives the central shaft 502 to rotate. At this time, the central shaft, as the "active component," forms a stable rotational motion within the hollow guide hole 403. Thus, a dynamic gap is formed between the rotating central shaft 502 and the hollow guide hole 403. While the valve core 402 moves axially, its central shaft 502 constrains the radial position of the valve core 402 through the medium within its dynamic gap, preventing the valve core 402 from being eccentric. At the same time, since there is no direct sliding contact between the central shaft 502 and the hollow guide hole 403, the frictional resistance caused by sliding is eliminated.

[0024] Specifically, when the central shaft 502 rotates at high speed, it drives the high-viscosity medium in its gap to move in the circumferential direction, forming a circumferential shear flow around the central shaft 502. Due to the high viscosity and poor flow of the medium, the circumferential shear flow generates a dynamic pressure effect in the gap. The medium pressure in the gap gradually increases from the axis of the central shaft 502 to the wall of the hollow guide hole 403, forming a uniform fluid lubrication film that isolates the central shaft 502 from the hollow guide hole 403. This reduces the frictional resistance brought about by the axial movement of the valve core 402, ensuring that the valve core 402 can still open and close flexibly in the high-viscosity medium and preventing the valve core 402 from jamming.

[0025] Furthermore, when tiny particles entrained in the high-viscosity medium enter the mating gap, i.e., the cleaning chamber 6, along with the medium, the high-viscosity medium easily forms a static adhesion layer on the wall of the guide hole 403. If this layer accumulates over a long period, it can cause the valve core to jam. Simultaneously, as the central shaft 502 rotates, it causes the medium within its gap to rotate, forming a spiral centrifugal flow field. Because the density of the particles is greater than that of the medium, they are thrown towards the wall of the hollow guide hole 403 under centrifugal force, and then fall into the spiral return oil groove 601. At the same time, the shearing force generated by the spiral centrifugal flow field can break the bond between the static adhesion layer and the wall of the hollow guide hole 403, causing the adhesion layer to flow into the spiral return oil groove 601 along with the medium particles. The spiral return oil groove 601, as the axial position of the valve core 402 changes, remains connected to the annular oil collecting groove 602. Subsequently, the medium particles flow along the spiral return oil groove 601 into the annular oil collecting groove 602 and are then discharged back into the overflow valve body 1 through the radial through hole 603. The rotation of the central shaft 502 agitates the medium and prevents it from hardening in the gap, thus ensuring the cleanliness of the wall of the hollow guide hole 403.

[0026] Example 2: Reference Figure 2-4 Based on Embodiment 1, a structural solution for an anti-jamming overflow valve suitable for high viscosity media is provided, including a sealing groove 7 opened on the inner wall of the valve core 402, a sealing ring 701 disposed inside the sealing groove 7, and an annular permanent magnet 702 embedded in the circumferential direction of the sealing ring 701. The annular permanent magnet 702 is distributed radially, with the outer ring being the N pole and the inner ring being the S pole.

[0027] The sealing ring 701 is based on polytetrafluoroethylene and has an overall O-shaped and lip-shaped composite structure, and is filled with carbon fiber.

[0028] A valve sleeve 8 is fitted around the valve core 402. An annular mounting groove is provided on the inner wall of the valve sleeve 8 at the position corresponding to the sealing ring 701. A miniature electromagnet 801 is embedded in the annular mounting groove along the circumferential direction. A flexible heat insulation pad 802 is filled between the miniature electromagnet 801 and the annular mounting groove.

[0029] Miniature Hall sensors 9 are symmetrically embedded in the inner walls of valve cores 402 located on the upper and lower sides of sealing ring 701, and the probes of miniature Hall sensors 9 correspond to miniature electromagnets 801.

[0030] The overflow valve body 1 has an oil inlet channel 10 and an oil outlet channel 11 on both sides of its surface. The oil inlet channel 10 and the oil outlet channel 11 are connected to the interior of the overflow valve body 1. A viscosity sensor 101 is embedded in the inner wall of the oil inlet channel 10.

[0031] A controller is installed on the outside of the overflow valve body 1. An electromagnetic coil is wound on the outer surface of the miniature electromagnet 801. The electromagnetic coil, the miniature Hall sensor 9, and the viscosity sensor 101 are all electrically connected to the controller through a feedback control loop.

[0032] In this embodiment, when the medium enters the oil inlet channel 10, the viscosity of the medium is first detected by the viscosity sensor 101. Simultaneously, the change in the magnetic field between the valve sleeve 8 and the sealing ring 701 is detected in real time at a frequency of 100Hz by the miniature Hall sensor 9. This change in magnetic field reflects the size of the sealing gap between the valve sleeve 8 and the sealing ring 701. When the sealing gap deviates from the set threshold due to viscosity fluctuations, the miniature Hall sensor 9 transmits the deviation signal to the controller through a feedback control loop. If the viscosity of the medium increases, the viscosity resistance between the valve sleeve 8 and the sealing ring 701 increases. At this time, the viscosity sensor 101 transmits the detected viscosity signal through feedback... The control loop transmits data to the controller. Based on the deviation and viscosity signals, the controller determines that the sealing gap needs to be increased. At this point, the controller energizes the micro electromagnet 801 and outputs an adjustment signal to increase the current of the micro electromagnet 801. After being energized, the micro electromagnet 801 generates a magnetic field opposite to that of the annular electromagnet 702 inside the sealing ring 701. Its repulsive force pushes the sealing ring 701 to contract radially inward, increasing the sealing gap. When the sealing gap increases, the contact area between the sealing ring 701 and the valve sleeve 8 decreases, reducing the viscous friction resistance. Subsequently, the valve core 402 can be opened and closed flexibly. At the same time, the sealing gap can still be sealed by the viscous sealing effect of the high-viscosity medium, preventing media leakage.

[0033] Furthermore, when the viscosity sensor 101 detects a decrease in the viscosity of the medium, its viscous resistance decreases accordingly. At this time, the controller determines, based on the feedback signal, that the sealing gap needs to be reduced, and then outputs an adjustment signal to reduce the current of the micro electromagnet 801. At this time, the magnetic field of the micro electromagnet 801 weakens. During the operation of the micro electromagnet 801, the flexible heat insulation pad 802 on one side can prevent the micro electromagnet 801 from heating up and affecting the performance of the sealing ring 701. Subsequently, the sealing ring 701 expands radially outward under its own elastic force, thereby reducing the sealing gap. At this time, the sealing gap allows the sealing ring 701 and the valve sleeve 8 to form an interference contact. At the same time, combined with the self-lubricating property of the polytetrafluoroethylene body of the sealing ring 701 itself, zero leakage is ensured, and the movement of the valve core 402 is not affected by excessive frictional resistance. Thus, the dual performance of reliable sealing and flexible movement is maintained, enabling the overflow valve body 1 to operate stably in high-viscosity media for a long time.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A structure of a stick prevention overflow valve suitable for a high viscosity medium, comprising an overflow valve body (1), characterized in that, The top of the overflow valve body (1) is fixedly connected to a valve cover (2), the top of the valve cover (2) is fixedly connected to a valve cap (3), the inner top of the valve cap (3) is provided with a valve stem (4), the bottom of the valve stem (4) is connected to a valve core (402) through a connecting spring (401), and the bottom of the valve core (402) is provided with a hollow guide hole (403). The bottom of the overflow valve body (1) is fixedly connected to an annular bearing seat (5). The interior of the annular bearing seat (5) is connected to a central shaft (502) through the inner ring (501) of the bearing. One end of the central shaft (502) is connected to a guide vane (503) through a hub, and the other end extends into the interior of the valve core (402) and is connected to the inner wall of the valve core (402).

2. The anti-jamming overflow valve structure suitable for high-viscosity media according to claim 1, characterized in that, The hole wall of the hollow guide hole (403) and the central shaft (502) cooperate to form a shaft hole guide pair, and a fitting gap of 0.1-0.2mm is formed between the shaft hole guide pairs, and the fitting gap forms a cleaning cavity (6). The cleaning chamber (6) has a spiral oil return groove (601) on its wall. An annular oil collection groove (602) is fixedly connected to the outer surface of the central shaft (502) and the bottom of the valve core (402). The lower end of the spiral oil return groove (601) extends into the interior of the annular oil collection groove (602). A radial through hole (603) is provided on the annular oil collection groove (602). The radial through hole (603) communicates with the interior of the overflow valve body (1).

3. The anti-jamming overflow valve structure suitable for high-viscosity media according to claim 1, characterized in that, The valve core (402) has a sealing groove (7) on its inner wall. A sealing ring (701) is provided inside the sealing groove (7). A ring permanent magnet (702) is embedded in the circumferential direction of the sealing ring (701). The ring permanent magnet (702) is distributed radially, with the outer ring being the N pole and the inner ring being the S pole.

4. The anti-jamming overflow valve structure suitable for high-viscosity media according to claim 3, characterized in that, The sealing ring (701) is based on polytetrafluoroethylene and has an overall O-shaped and lip-shaped composite structure, and is filled with carbon fiber.

5. The anti-jamming overflow valve structure suitable for high-viscosity media according to claim 3, characterized in that, The valve core (402) is fitted with a valve sleeve (8). The inner wall of the valve sleeve (8) is provided with an annular mounting groove corresponding to the sealing ring (701). A miniature electromagnet (801) is embedded in the annular mounting groove along the circumferential direction. A flexible heat insulation pad (802) is filled between the miniature electromagnet (801) and the annular mounting groove.

6. The anti-jamming overflow valve structure suitable for high-viscosity media according to claim 3, characterized in that, Miniature Hall sensors (9) are symmetrically embedded in the inner walls of the valve cores (402) located on the upper and lower sides of the sealing ring (701), and the probes of the miniature Hall sensors (9) correspond to miniature electromagnets (801).

7. The anti-jamming overflow valve structure suitable for high-viscosity media according to claim 3, characterized in that, The overflow valve body (1) has an oil inlet channel (10) and an oil outlet channel (11) on both sides of its surface. The oil inlet channel (10) and the oil outlet channel (11) are connected to the interior of the overflow valve body (1). A viscosity sensor (101) is embedded in the inner wall of the oil inlet channel (10).

8. The anti-jamming overflow valve structure suitable for high-viscosity media according to claim 5, characterized in that, The overflow valve body (1) is equipped with a controller on its exterior. The outer surface of the miniature electromagnet (801) is wound with an electromagnetic coil. The electromagnetic coil, the miniature Hall sensor (9), and the viscosity sensor (101) are all electrically connected to the controller through a feedback control loop.

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