Pressure regulating type one-way pressure reducing stop valve

Abstract

A pressure regulating type one-way pressure reducing stop valve comprises a valve body, a medium inlet, a medium outlet, a valve rod, a valve element arranged at the bottom of the valve rod and a valve seat are arranged in the valve body, a control component is arranged outside the valve body and comprises a motor used for driving the valve rod, and the motor and the valve body are isolated through an isolation shell. The upper end of the valve body extends into the isolation shell, the control component further comprises a control shell arranged outside the motor in a covering mode, a control chamber is formed between the control shell and the isolation shell, a magnetoelectric stroke sensor and a first permanent magnet arranged opposite to the valve rod in the axial direction are arranged in the control chamber, and a second permanent magnet is arranged at the end of the valve rod. The valve rod and the valve element are driven by the motor to perform linear displacement so as to switch the sealing state with the valve seat, and the magnetoelectric stroke sensor is used for detecting changes after magnetic fields of the first permanent magnet and the second permanent magnet are superposed so as to obtain accurate moving stroke data of the valve rod and adjust the moving stroke of the valve rod through the control component.

Description

Technical Field

[0001] This invention relates to a pressure-regulating one-way pressure-reducing shut-off valve, belonging to the field of valves. Background Technology

[0002] Valves, as the most common actuators in the field of fluid control, are widely used in pipeline systems in industries such as petroleum, chemical, water supply, gas, pharmaceutical, and power. Gate valves open or close the fluid passage by vertically moving the valve disc along the valve seat. They have advantages such as simple structure, good sealing effect, and low flow resistance, but lack automatic adjustment function and cannot maintain stable downstream pressure.

[0003] However, existing gate valves can only open and close in a wide range, and cannot precisely adjust the position of the valve core to regulate the internal pressure. Traditional gate valves cannot accurately determine the position of the valve core relative to the valve seat, and thus cannot adjust the position of the valve core to reduce pressure. To solve this problem, a displacement sensor can be installed at the valve core position. However, the materials of the valve body, valve core, and medium can interfere with the sensor's data acquisition, and external environmental vibrations can affect the accuracy of the data, leading to a decrease in the sensor's precision. As a result, the sensor cannot reliably detect the position of the valve core, affecting the pressure reduction effect and the valve's performance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a pressure regulating one-way pressure reducing shut-off valve, which aims to solve the technical problems such as the inaccuracy caused by the easy interference of the external environment when using displacement sensors in the traditional way.

[0005] A pressure-regulating one-way pressure-reducing shut-off valve includes a valve body with a medium inlet, a medium outlet, a valve stem, a valve core located at the bottom of the valve stem, and a valve seat. A control component is located outside the valve body. The control component includes a motor for driving the valve stem, and the motor and valve body are isolated by an isolation shell. The upper end of the valve body extends into the isolation shell. The control component also includes a control shell covering the motor, forming a control chamber between the control shell and the isolation shell. Inside the control chamber are a magnetoelectric travel sensor and a first permanent magnet axially opposite to the valve stem. A second permanent magnet is located at the end of the valve stem. The valve stem and valve core undergo linear displacement under the drive of the motor, thereby switching the sealing state with the valve seat. The magnetoelectric travel sensor detects the change in the magnetic field of the first and second permanent magnets after superposition, obtaining precise travel data of the valve stem, and adjusting the travel of the valve stem using the control component.

[0006] This technical solution utilizes the principle of superimposed magnetic fields from dual permanent magnets. The magnetoelectric travel sensor is unaffected by media composition, temperature, and vibration, enabling long-term stable acquisition of valve stem displacement signals and ensuring measurement accuracy. By arranging the magnetoelectric travel sensor and the corresponding first and second permanent magnets in the control room, this invention can detect the valve stem displacement in real time with high precision, and accordingly perform closed-loop adjustment of the valve core position. This avoids downstream pressure fluctuations caused by the traditional "on / off" control of gate valves, achieving continuous adjustment from 0% to 100% of the opening degree, meeting the requirements for precise pressure reduction and stabilization. Magnetoelectric sensing technology avoids the shortcomings of contact or optical sensors, which are susceptible to interference from dirt, attenuation, or obstruction, and is suitable for high-temperature, high-pressure, and corrosive media environments.

[0007] Preferably, the north poles of the first permanent magnet and the second permanent magnet are arranged opposite each other.

[0008] With this technical solution, when the north poles are opposite each other, the magnetic field lines are more concentrated at the sensor, and the initial small displacement of the valve stem can cause a significant change in magnetic flux density, thereby improving the sensor's resolution and sensitivity. The magnetic field gradient is axially symmetrically distributed between the two north poles, and the magnetic signal received by the stroke sensor is basically linearly related to the actual displacement of the valve stem, reducing nonlinear errors and facilitating accurate calibration and compensation by the subsequent electronic system. The relative polarity configuration can keep the magnetic field changes consistent during forward and reverse strokes, significantly reducing hysteresis and dead zone width, and improving the response speed and repeatability of the closed-loop control of the system. Alternatively, the same effect can be achieved by setting the south poles of the first and second permanent magnets opposite each other.

[0009] Preferably, the control room is also provided with a PCB board, the first permanent magnet is disposed on the upper part of the PCB board, and the magnetoelectric travel sensor is electrically connected and disposed on the lower part of the PCB board near the first permanent magnet and the second permanent magnet.

[0010] Through this technical solution, the magnetoelectric travel sensor can accurately collect magnetic field change data of the first and second permanent magnets. The positioning holes and pads on the PCB board ensure high-precision matching of the relative positions of the permanent magnets and the sensor. No additional alignment process is required during assembly, which significantly reduces manual assembly errors and time costs. The PCB layout can integrate grounding planes and EMI filtering components to reduce the impact of environmental and motor interference on the magnetoelectric signal and improve the system's anti-electromagnetic noise capability.

[0011] Preferably, the motor is a screw motor, which includes a nut disposed in the fixed valve body and a valve stem that cooperates with the nut. The screw motor also includes a stator disposed outside the isolation shell, and a rotor is disposed above the valve body. The stator and the rotor are isolated by the isolation shell.

[0012] This technical solution separates the stator and rotor through an isolation shell, completely isolating the medium from the motor section. This eliminates the direct channel between the motor cavity and the valve body cavity, significantly improving the medium sealing performance and preventing the risk of oil leakage or medium seepage into the motor. The screw motor structure has the advantages of self-locking characteristics and small pitch, ensuring that the valve stem will not slide on its own when power is off or under reverse pressure, achieving closed-loop non-advancing and enabling precise position control and constant pressure regulation. The isolation shell is made of corrosion-resistant material, which can withstand high-pressure or corrosive media environments, protecting the stator coils and electronic components from corrosion and improving overall durability.

[0013] Furthermore, the isolation shell includes a base plate, on which a magnetic cylindrical pin is provided, the rotor is disposed on the magnetic cylindrical pin, and the magnetic cylindrical pin is disposed between the first permanent magnet and the second permanent magnet.

[0014] This technical solution utilizes a structure with magnetic cylindrical pins mounted on the base plate of the isolation shell. This not only achieves low-friction, high-stability support for the rotor during rotation but also leverages the magnetic conductivity and positioning characteristics of the magnetic cylindrical pins to effectively enhance the magnetic field of the permanent magnets. This concentrates the magnetic flux path between the first and second permanent magnets, thereby improving the sensitivity and accuracy of the magnetoelectric travel sensor. The presence of the magnetic cylindrical pins helps constrain the rotor's axial and radial movement, improving the overall reliability of the rotation system and extending the service life of internal motor components. Simultaneously, the stable magnetic coupling between the magnetic cylindrical pins and the permanent magnets enables indirect magnetic feedback monitoring of rotor displacement or speed without adding complex structures, providing a solid foundation for closed-loop control of the system.

[0015] Furthermore, the bottom of the isolation shell is provided with a shoulder, the valve body abuts against the shoulder to form a sealed connection, a fixing part is sleeved above the shoulder, and the screw motor is located above the fixing part.

[0016] This technical solution allows the valve body to achieve initial self-positioning by abutting the shoulder at its bottom. With the help of a sealing ring or O-ring, a reliable seal can be formed, simplifying the assembly process and avoiding the complex layout of additional sealing elements. The shoulder bears the static and dynamic pressure of the valve body, while the fixed part supports the weight of the motor. This clear division of forces reduces the risk of deformation of the isolation shell and improves the overall structural rigidity. The design of the fixed part and the shoulder allows for quick separation and assembly of the valve body and motor assembly without disassembling the entire machine, significantly shortening maintenance and replacement cycles. The contact surface between the shoulder and the fixed part can be filled with elastic gaskets or rubber vibration dampers, effectively isolating the motor vibration from the valve body and sensor, protecting internal components from fatigue damage.

[0017] Preferably, the valve body has a sealing groove on its outer wall, and a sealing ring is provided in the sealing groove. The sealing ring is used to abut against the isolation shell to form a sealed connection.

[0018] This technical solution combines a sealing groove and a sealing ring to provide dual sealing at both the end face and radial direction, further reducing the risk of media leakage and improving the overall sealing reliability of the system. The groove structure physically limits the sealing ring, preventing it from shifting or falling off under media pressure, ensuring long-term stable operation. The sealing ring can slide in / out through the groove without disassembling the main structure, enabling quick on-site replacement and shortening maintenance downtime. By selecting wear-resistant rubber or polytetrafluoroethylene (PTFE) and using groove guidance, friction and wear between the sealing ring and the isolation shell are reduced, extending service life.

[0019] The beneficial effects of this invention are as follows: Utilizing the principle of superimposed magnetic fields from dual permanent magnets, the magnetoelectric travel sensor is unaffected by the composition of the medium, temperature, and vibration, enabling long-term stable acquisition of valve stem displacement signals and ensuring measurement accuracy. By arranging the magnetoelectric travel sensor and the oppositely positioned first and second permanent magnets in the control room, this invention can detect the valve stem displacement in real time with high precision, and accordingly perform closed-loop adjustment of the valve core position. This avoids downstream pressure fluctuations caused by the traditional "open / close" control of gate valves, achieving continuous adjustment from 0% to 100% of the opening degree, meeting the requirements for precise pressure reduction and stabilization. Magnetoelectric sensing technology avoids the shortcomings of contact or optical sensors, which are susceptible to interference from dirt, attenuation, or obstruction, and is suitable for high-temperature, high-pressure, and corrosive media environments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is the present invention. Figure 1 Enlarged detail view of point A in the middle; In the diagram, 10 is the valve body; 11 is the medium inlet; 12 is the medium outlet; 13 is the valve stem; 14 is the valve core; 15 is the valve seat; 16 is the motor; 17 is the control housing; 18 is the control chamber; 19 is the magnetoelectric stroke sensor; 20 is the first permanent magnet; 21 is the second permanent magnet; 22 is the PCB board; 23 is the nut; 24 is the valve stem; 25 is the isolation housing; 26 is the stator; 27 is the rotor; 28 is the base plate; 29 is the magnetic cylindrical pin; 30 is the shoulder; 31 is the fixing part; 32 is the sealing groove; and 33 is the sealing ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0024] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0025] like Figure 1-2 The diagram illustrates an embodiment of a pressure-regulating one-way pressure-reducing shut-off valve according to the present invention. It includes a valve body 10, which contains a medium inlet 11, a medium outlet 12, a valve stem 2413, a valve core 14 located at the bottom of the valve stem 2413, and a valve seat 15. A control component is located outside the valve body 10. This control component includes a motor 16 for driving the valve stem 2413. The motor 16 and the valve body 10 are isolated by an isolation shell 25. The upper end of the valve body 10 extends into the isolation shell 25. The control component also includes a control shell 17 covering the motor 16. The control shell 17 is isolated from the motor 16. A control chamber 18 is formed between the shells 25. Inside the control chamber 18, there is a magnetoelectric stroke sensor 19 and a first permanent magnet 20 arranged axially opposite to the valve stem 2413. A second permanent magnet 21 is provided at the end of the valve stem 2413. The valve stem 2413 and the valve core 14 are linearly displaced under the drive of the motor 16, thereby switching the sealing state with the valve seat 15. The magnetoelectric stroke sensor 19 is used to detect the change after the magnetic field of the first permanent magnet 20 and the second permanent magnet 21 is superimposed, so as to obtain the precise movement stroke data of the valve stem 2413 and adjust the movement stroke of the valve stem 2413 through the control components.

[0026] This technical solution utilizes the principle of superimposed magnetic fields from dual permanent magnets. The magnetoelectric travel sensor 19 is unaffected by media composition, temperature, and vibration, enabling it to stably acquire the valve stem 2413 displacement signal over a long period, ensuring measurement accuracy. By arranging the magnetoelectric travel sensor 19 and the corresponding first and second permanent magnets 21 within the control room 18, this invention can detect the valve stem 2413 displacement in real time with high precision, and accordingly perform closed-loop adjustment of the valve core 14 position. This avoids downstream pressure fluctuations caused by the traditional "open / close" control of gate valves, achieving continuous adjustment from 0% to 100% opening degree, meeting the requirements for precision pressure reduction and stabilization. Magnetoelectric sensing technology avoids the shortcomings of contact or optical sensors, which are susceptible to interference from dirt, attenuation, or obstruction, and is suitable for high-temperature, high-pressure, and corrosive media environments.

[0027] The north poles of the first permanent magnet 20 and the second permanent magnet 21 are arranged opposite each other.

[0028] With this technical solution, when the north poles are opposite each other, the magnetic field lines are more concentrated at the sensor, and the initial small displacement of the valve stem 2413 can cause a significant change in magnetic flux density, thereby improving the resolution and sensitivity of the sensor. The magnetic field gradient is axially symmetrically distributed between the two north poles, and the magnetic signal received by the stroke sensor is basically linearly related to the actual displacement of the valve stem 2413, reducing nonlinear errors and facilitating accurate calibration and compensation by the subsequent electronic system. The relative polarity configuration can keep the magnetic field changes consistent during forward and reverse strokes, significantly reducing hysteresis and dead zone width, and improving the response speed and repeatability of the closed-loop control of the system. Alternatively, the same effect can be achieved by setting the south poles of the first permanent magnet 20 and the second permanent magnet 21 opposite each other.

[0029] The control room 18 is also equipped with a PCB board 22, the first permanent magnet 20 is located on the upper end of the PCB board 22, and the magnetoelectric travel sensor 19 is electrically connected and located on the side of the PCB board 22 near the first permanent magnet 20 and the second permanent magnet 21.

[0030] Through this technical solution, the magnetoelectric travel sensor 19 can accurately collect magnetic field change data of the first permanent magnet 20 and the second permanent magnet 21. The positioning holes and pads on the PCB board 22 ensure high-precision matching of the relative positions of the permanent magnet and the sensor. No additional alignment process is required during assembly, which significantly reduces manual assembly errors and time costs. The PCB layout can integrate grounding plane and EMI filtering components to reduce the impact of environmental and motor interference on the magnetoelectric signal and improve the system's anti-electromagnetic noise capability.

[0031] The motor 16 is a screw motor 16, which includes a nut 23 disposed inside the fixed valve body 10 and a valve stem 2413 that cooperates with the nut 23. The screw motor 16 also includes a stator 26 disposed outside the isolation shell 25. A rotor 27 is disposed above the valve body 10. The stator 26 and the rotor 27 are isolated by the isolation shell 25.

[0032] Through this technical solution, the stator 26 and rotor 27 are separated by the isolation shell 25, and the medium and motor 16 are completely separated, eliminating the direct channel between the motor 16 cavity and the valve body 10 cavity, significantly improving the medium sealing performance and eliminating the risk of oil leakage or medium seepage into the motor 16; the screw motor 16 structure has the advantages of self-locking characteristics and small pitch, and the valve stem 2413 will not slide on its own when power is off or reverse pressure is applied, realizing closed-loop non-advancing, and enabling precise position control and constant pressure regulation; the isolation shell 25 is made of corrosion-resistant material, which can withstand high pressure or corrosive medium environment, protecting the stator 26 coil and electronic components from corrosion and improving overall durability.

[0033] The isolation shell 25 includes a base plate 28, on which a magnetic cylindrical pin 29 is provided. The rotor 27 is disposed on the magnetic cylindrical pin 29, and the magnetic cylindrical pin 29 is disposed between the first permanent magnet 20 and the second permanent magnet 21.

[0034] This technical solution utilizes a magnetic cylindrical pin 29 mounted on the base plate 28 of the isolation shell 25, which supports the rotor 27. This not only achieves low-friction and high-stability support for the rotor 27 during rotation but also enhances the magnetic field effect of the permanent magnets by leveraging the magnetic conductivity and positioning characteristics of the magnetic cylindrical pin 29. This concentrates the magnetic flux path between the first permanent magnet 20 and the second permanent magnet 21, thereby improving the detection sensitivity and accuracy of the magnetoelectric travel sensor 19. The presence of the magnetic cylindrical pin 29 helps constrain the axial movement and radial offset of the rotor 27, improving the overall reliability of the rotation system and extending the service life of the internal components of the motor 16. Simultaneously, the stable magnetic coupling between the magnetic cylindrical pin 29 and the permanent magnets allows for indirect magnetic feedback monitoring of the rotor 27's displacement or velocity without adding complex structures, providing a solid foundation for the system's closed-loop control.

[0035] The bottom of the isolation shell 25 is provided with a shoulder 30, the valve body 10 abuts against the shoulder 30 to form a sealed connection, a fixing part 31 is sleeved on the shoulder 30, and the screw motor 16 is disposed above the fixing part 31.

[0036] Through this technical solution, the bottom end of the valve body 10 abuts against the shoulder 30 to achieve initial self-positioning. After being combined with a sealing ring or O-ring, a reliable seal can be formed, simplifying the assembly process and avoiding the complex layout of additional sealing elements. The shoulder 30 bears the static and dynamic pressure of the valve body 10, while the fixed part 31 bears the weight of the motor 16. The clear division of forces reduces the risk of deformation of the isolation shell 25 and improves the overall structural rigidity. The cooperative design of the fixed part 31 and the shoulder 30 enables the rapid separation and assembly of the valve body 10 and the motor 16 assembly without disassembling the entire machine, greatly shortening the maintenance and replacement cycle. The contact surface between the shoulder 30 and the fixed part 31 can be filled with elastic gaskets or rubber vibration dampers to effectively isolate the impact of motor 16 vibration on the valve body 10 and the sensor, protecting internal components from fatigue damage.

[0037] The valve body 10 has a sealing groove 32 on its outer wall, and a sealing ring 33 is provided in the sealing groove 32. The sealing ring 33 is used to abut against the isolation shell 25 to form a sealing connection.

[0038] This technical solution combines the sealing groove 32 and the sealing ring 33 to provide dual sealing at the end face and radial direction, further reducing the risk of media leakage and improving the overall sealing reliability of the system. The groove structure can physically limit the sealing ring 33, preventing it from shifting or falling off under media pressure, thus ensuring long-term stable operation. The sealing ring 33 can slide in / out through the groove without disassembling the main structure, enabling quick on-site replacement and shortening maintenance downtime. By selecting wear-resistant rubber or polytetrafluoroethylene and other sealing materials, combined with groove guidance, friction and wear between the sealing ring 33 and the isolation shell 25 are reduced, extending service life.

[0039] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

[0040] While the invention has been described with reference to several specific embodiments, it should be understood that the invention is not limited to the disclosed specific embodiments. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A pressure regulating type one-way pressure reducing stop valve, characterized by: The valve body is provided with a medium inlet, a medium outlet, a valve rod, a valve core arranged at the bottom of the valve rod, and a valve seat, and the valve body is externally provided with a control component, the control component comprises a motor for driving the valve rod, the motor and the valve body are isolated by an isolation shell, the upper end of the valve body extends into the isolation shell, the control component further comprises a control shell arranged outside the motor, a control chamber is formed between the control shell and the isolation shell, a magneto travel sensor and a first permanent magnet arranged in axial opposition to the valve rod are arranged inside the control chamber, a second permanent magnet is arranged at the end of the valve rod, the valve rod and the valve core are driven by the motor to move linearly to switch the sealing state with the valve seat, the magneto travel sensor is used to detect the change of the superimposed magnetic field of the first permanent magnet and the second permanent magnet to obtain the accurate movement stroke data of the valve rod and adjust the movement stroke of the valve rod through the control component.

2. The pressure regulating type unidirectional pressure reducing stop valve according to claim 1, wherein: The north poles of the first permanent magnet and the second permanent magnet are arranged in opposition.

3. The pressure regulating type unidirectional pressure reducing stop valve according to claim 1, wherein: The control chamber is further provided with a PCB board, the first permanent magnet is arranged at the upper end of the PCB board, and the magneto travel sensor is electrically connected and arranged on one side below the PCB board close to the first permanent magnet and the second permanent magnet.

4. The pressure regulating type pressure reducing check valve according to claim 1, wherein: The motor is a screw motor, the screw motor comprises a nut arranged in the fixed valve body, and a valve rod matched with the nut, the screw motor further comprises a stator arranged outside the isolation shell, an upper portion of the valve body is provided with a rotor, and the stator and the rotor are isolated by the isolation shell.

5. The pressure regulating type one-way pressure reducing stop valve according to claim 4, wherein: The isolation shell comprises a bottom plate, a magnetic cylindrical pin is arranged on the bottom plate, the rotor is arranged on the magnetic cylindrical pin, and the magnetic cylindrical pin is arranged between the first permanent magnet and the second permanent magnet.

6. The pressure regulating type one-way pressure reducing stop valve according to claim 5, wherein: A shoulder portion is arranged at the bottom of the isolation shell, the valve body is abutted on the shoulder portion to form a sealed connection, a fixing portion is sleeved above the shoulder portion, and the screw motor is arranged above the fixing portion.

7. The pressure regulating type unidirectional pressure reducing stop valve according to claim 1, wherein: A sealing groove is arranged on the outer wall of the valve body, a sealing ring is arranged in the sealing groove, and the sealing ring is used to abut on the isolation shell to form a sealed connection.

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