Adjustment valve and flow adjustment system

Abstract

The present invention relates to an adjustment valve and a flow adjustment system, and belongs to the field of hydraulic adjustment valves. The adjustment valve comprises: a valve body, a valve seat, a valve core, a flow adjustment component, an actuator oil cylinder, a positioner oil cylinder, a power apparatus and a position detection apparatus. The valve seat and the flow adjustment component are mounted in the valve body. A cylinder body of the actuator oil cylinder is connected to the flow adjustment component. The valve core is connected to an actuation piston rod of the actuator oil cylinder. The positioner oil cylinder is connected to a cavity of the actuator oil cylinder. The power apparatus is connected to a positioning piston rod of the positioner oil cylinder. The position detection apparatus cooperates with the positioning piston rod of the positioner oil cylinder, and the positioner oil cylinder cooperates with the cavity volume, the cavity length, and the piston rod stroke of the actuator oil cylinder. The present invention places the positioner oil cylinder in communication with the cavity of the actuator oil cylinder, such that position information of the piston rod of the positioner oil cylinder accurately represents position information of the valve core, that is, degree of openness information of the valve, thereby solving the problem in the prior art of uncertain valve openness information.

Description

Control valves and flow control systems Technical Field

[0001] The present invention belongs to the field of hydraulic regulating valves, and in particular relates to a regulating valve and a flow regulating system. Background Art

[0002] With the continuous advancement of industrial production technology worldwide, the process industry is moving towards large-scale, integrated, intelligent, and clean processes. This requires industrial enterprises to increase their investment in automated control equipment. Production process control requires a large number of control valves and their predictive maintenance to achieve process enhancement, functional safety, and energy efficiency management. As the final actuator in the control loop, control valves (also known as regulating valves) play an extremely important role in process control in the process industry. However, this has also long been a technical weakness. Key challenges include: the wide variety of control valves, numerous specifications, and numerous parameters, making selection, installation, maintenance, and management difficult; and poor maintenance performance, reliability, and durability. Traditional angle valves, butterfly valves, ball valves, and sleeve valves all suffer from these issues.

[0003] In order to solve these problems, existing technologies have successively introduced axial flow control valves. Axial flow control valves are different from conventional linear control valves. They change the overall flow structure of conventional linear control valves and the phenomenon that the throttle parts of conventional linear control valves are inconsistent with the flow direction of the medium, so that the energy loss of the medium is less and the flow capacity is increased by 20% to 50% compared with conventional linear control valves. They have the characteristics of low flow resistance coefficient, durability, low maintenance and high performance, and are widely used in the regulation and control of natural gas, crude oil, refined oil and other non-corrosive gases and liquids. Relevant professional technicians and manufacturers at home and abroad have launched various axial flow control valves, such as US4638832, US2011 / 0017306A1, WO2019 / 20153A2, as well as CN210770459U, CN209309448U, CN207539391U, CN20672442U, CN203797130U, CN203442298U, and CN107061834A.

[0004] The development of modern industry has put forward higher requirements on the control accuracy and rapid response of flow control valves. In the face of higher performance requirements, the existing technology has the following problems: the valve core of the existing technology is in a valve body filled with fluid medium, and the valve core position cannot be accurately measured, resulting in uncertainty in the valve opening information of the existing technology, inaccurate valve core position control when the valve core is throttling control, and uneven transition connection. Technical issues

[0005] Provided are a regulating valve and a flow regulating system, which can accurately detect and control the valve opening, realize closed-loop control, and form an axial flow regulating valve with hydraulic closed-loop control, thereby solving the problems of uncertainty in valve opening information, inaccurate valve core position control when the valve core is throttling control, and uneven transition connection. Technical Solutions

[0006] The regulating valve includes: a valve body, a valve seat, a valve core, a throttling element, an actuator cylinder, a positioner cylinder, a power unit and a position detection device.

[0007] The valve seat and the throttling member are installed in the valve body, the cylinder body of the actuator cylinder is connected to the throttling member, the valve core is connected to the actuator piston rod of the actuator cylinder, the positioner cylinder is correspondingly connected to the cavity of the actuator cylinder, the power device is connected to the positioning piston rod of the positioner cylinder, and the position detection device cooperates with the positioning piston rod of the positioner cylinder.

[0008] The cavity volume, cavity length and piston rod stroke of the positioner oil cylinder and the actuator oil cylinder cooperate with each other.

[0009] The power device is used to drive the positioning piston rod of the positioner oil cylinder to move, so that the execution piston rod of the actuator oil cylinder drives the valve core to move relative to the valve seat, thereby realizing the control of the valve opening.

[0010] The position detection device is used to detect the position of the positioning piston rod of the positioner cylinder, thereby detecting the valve opening information.

[0011] In a further embodiment, the cavity volume, cavity length and piston rod stroke of the positioner cylinder are equal to those of the actuator cylinder, so that the distance and speed at which the positioning piston rod of the positioner cylinder moves equals the distance and speed at which the actuator piston rod of the actuator cylinder drives the valve core to move.

[0012] In a further embodiment, the valve seat is a streamlined valve seat.

[0013] The throttling element includes a front body and a straight pipe section, the straight pipe section is installed at one end of the front body close to the valve body, the front body has a first arc-shaped cross-section structure, and the straight pipe section has a rectangular cross-section structure.

[0014] One end of the valve core close to the valve seat is a second arc-shaped cross-section structure, and the valve core is slidably connected to one end of the throttling member close to the valve seat.

[0015] The actuator cylinder is arranged between the valve core and the throttling member. The valve core and the throttling member cooperate to form a teardrop-shaped structure, which optimizes the flow field in the valve and solves the problem of the influence of the actuator in the prior art on the fluid mechanics structure of the throttling member.

[0016] In a further embodiment, the regulating valve further comprises: a thermal flow sensor installed in the valve body, which is used to detect the flow rate of the fluid medium in the valve body.

[0017] In a further embodiment, the regulating valve further comprises: a differential pressure flow sensor, which is installed in the valve body and is used to detect the flow of the fluid medium in the valve body, thereby realizing two sets of redundant closed-loop control.

[0018] In a further embodiment, the power device is a linear stepping motor, or is composed of a stepping motor, a lead screw mechanism and a guide rail mechanism.

[0019] In a further embodiment, the position detection device is a displacement sensor provided on one side of the positioning piston rod of the positioner cylinder.

[0020] In a further embodiment, the cavity volumes of the positioner cylinder and the actuator cylinder are equal, the cavity length and the piston rod stroke of the positioner cylinder are N times the cavity length and the piston rod stroke of the actuator cylinder, N>1, so that the distance moved by the actuator piston rod of the actuator cylinder = the distance moved by the positioning piston rod of the positioner cylinder / N, further improving the control accuracy.

[0021] In a further embodiment, the power device includes: a stepper motor, a nut, a lead screw and a guide block.

[0022] The nut is installed in the stepping motor, the screw rod is threadedly connected to the nut, and the screw rod is connected to the positioning piston rod of the positioner oil cylinder.

[0023] The guide block is installed at the end of the stepping motor.

[0024] A spline groove is provided on the threaded portion of the screw rod, and the guide block is provided with a protrusion that cooperates with the spline groove. The screw rod and the guide block spline structure cooperate with each other, which greatly reduces the volume and cost of the entire control system of the regulating valve.

[0025] In a further embodiment, the position detection device consists of an angle sensor and a roller assembly.

[0026] The angle sensor and roller assembly are arranged at one end of the screw rod away from the positioner cylinder. The roller assembly is connected to the angle sensor. The roller assembly is used to provide support force for the screw rod. When the screw rod drives the angle sensor to move, the roller assembly rolls. The angle sensor is used to detect the rotation angle of the roller, thereby detecting the position of the positioning piston rod of the positioner cylinder and detecting the valve opening information. It can provide support force for the screw rod while detecting the position of the positioning piston rod of the positioner cylinder, thereby realizing mechanism reuse.

[0027] A flow regulating system comprises the regulating valve described in any one of the above technical solutions. Beneficial effects

[0028] The present application connects the cavities of the positioner cylinder and the actuator cylinder accordingly, so that the position information of the positioner cylinder piston rod accurately represents the position information of the valve core, that is, the valve opening information, solving the problem of uncertain valve opening information in the prior art.

[0029] Moreover, the hydraulic oil pressure signal generated by the piston of the positioner cylinder can reach the actuator cylinder instantly. Similarly, the hydraulic oil pressure signal generated by the piston of the actuator cylinder can reach the positioner cylinder instantly, and the valve core position, that is, the valve opening, can be accurately controlled. Therefore, the system has good dynamic characteristics, provides closed-loop control, and forms an axial flow regulating valve with hydraulic closed-loop control, which solves the problems of inaccurate valve core position control and uneven transition connection when the valve core is throttling control in the prior art.

[0030] By precisely controlling the position of the valve core, the speed of valve core movement can be controlled, thereby adjusting the speed of pressure change before and after the throttling device; by designing the shape of the throttling device, the change in pressure before and after the fluid flows through the throttling device is optimized; the above measures reduce the vibration at the inlet and outlet of the throttling device, and when the medium in the pipeline is liquid, the possibility of flash evaporation, cavitation and cavitation is reduced; it can meet the higher performance requirements of modern industry for control accuracy and rapid response of flow control valves.

[0031] Moreover, the cavities of the positioner cylinder and the actuator cylinder can be connected accordingly through the pipeline, which greatly reduces the volume of the connecting parts in the valve body, reduces the flow resistance, and reduces the impact on the flow state of the medium in the valve body, further solving the problem of the existing technology that the volume of the connecting parts in the valve body is too large, resulting in increased flow resistance and affecting the flow state of the medium in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of the overall structure of the present invention.

[0033] FIG2 is a partial schematic diagram of the inner structure of the valve body of the present invention.

[0034] FIG3 is a schematic diagram of the valve core and throttling element structure combination of the present invention.

[0035] FIG4 is an exploded schematic diagram of the valve core and throttling member structure of the present invention.

[0036] FIG5 is a schematic diagram of the outer structure of the valve body when the position detection device of the present invention is an embodiment of a displacement sensor.

[0037] FIG6 is a schematic diagram of the structure of the actuator cylinder in the valve body of the present invention.

[0038] FIG7 is a schematic structural diagram of an embodiment of the present invention in which the roller assembly is composed of a support member that is a bracket for fixing the roller, and the roller is connected to the support member.

[0039] FIG8 is a schematic structural diagram of an embodiment of the present invention in which the roller assembly is composed of a roller and a support member abutting against each other, and the roller rolls on the support member.

[0040] FIG9 is a schematic structural diagram of an embodiment of the power device of the present invention, which is composed of a stepping motor, a nut, a lead screw and a guide block.

[0041] The reference numerals in the figure are as follows: valve body 1, throttling device 2, valve core 3, valve seat 4, actuator cylinder 5, actuator piston 6, actuator piston rod 7, thermal flow sensor 8, differential pressure flow sensor 9, hydraulic oil pipe 10, power unit 11, positioner cylinder 12, positioning piston 13, positioning piston rod 14, position detection device 15, oil pipe joint 16, front body 17, straight pipe 18, stepping motor 111, screw rod 112, nut 113, guide block 114, roller 151, support 152, angle sensor 153. Best Mode for Carrying Out the Invention

[0042] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0043] The present invention discloses a regulating valve, which can accurately detect and control the opening of the valve, realize closed-loop control to form an axial flow regulating valve with hydraulic closed-loop control, and solve the problems of uncertainty of valve opening information, inaccurate valve core position control when the valve core is throttling control, and uneven transition connection.

[0044] First embodiment,

[0045] As shown in FIG1 , the regulating valve, flow regulating system and method include: a valve body 1 , a valve seat 4 , a valve core 3 , a throttling member 2 , an actuator cylinder 5 , a positioner cylinder 12 , a power device 11 and a position detection device 15 .

[0046] The valve seat 4 and the throttling member 2 are installed in the valve body 1, the cylinder body of the actuator cylinder 5 is connected to the throttling member 2, the valve core 3 is connected to the actuator piston rod 7 of the actuator cylinder 5, the positioner cylinder 12 is correspondingly connected to the cavity of the actuator cylinder 5, the power device 11 is connected to the positioning piston rod 14 of the positioner cylinder 12, and the position detection device 15 cooperates with the positioning piston rod 14 of the positioner cylinder 12.

[0047] The cavity volume, cavity length and piston rod stroke of the positioner cylinder 12 and the actuator cylinder 5 are coordinated with each other.

[0048] The power device 11 is used to drive the positioning piston rod 14 of the positioner cylinder 12 to move, so that the actuator piston rod 7 of the actuator cylinder 5 drives the valve core 3 to move relative to the valve seat 4, thereby achieving control of the valve opening.

[0049] The position detection device 15 is used to detect the position of the positioning piston rod 14 of the positioner cylinder 12 to detect the valve opening information.

[0050] In this embodiment, the corresponding communication between the cavities of the positioner cylinder 12 and the actuator cylinder 5 means that the rod cavities are connected to the rod cavities, and the rodless cavities are connected to the rodless cavities, so that when the inner diameter and cavity length of the cavities of the positioner cylinder 12 and the actuator cylinder 5 are equal, the positions of the positioning piston rod 14 of the positioner cylinder 12 and the actuator piston rod 7 of the actuator cylinder 5 can be made equal.

[0051] In this embodiment, the valve seat 4 and the throttle member 2 are both fixedly installed in the valve body 1 .

[0052] In this embodiment, the regulating valve also includes a controller, the power device 11 and the position detection device 15 are connected to the controller, the position detection device 15 sends the valve opening information to the controller, and the controller is used to send an electrical signal to the power device 11 to control the valve opening.

[0053] In the embodiment of FIG. 1 , the regulating valve further includes a thermal flow sensor 8 , which is installed in the valve body 1 and is used to detect the flow rate of the fluid medium in the valve body 1 .

[0054] In the embodiment of FIG. 1 , the regulating valve further comprises: a differential pressure flow sensor 9 , which is installed in the valve body 1 and is used to detect the flow of the fluid medium in the valve body 1 .

[0055] In this embodiment, the thermal flow sensor 8 and the differential pressure flow sensor 9 are connected to the controller.

[0056] A thermal flow sensor 8 or a differential pressure flow sensor 9 can be installed in the regulating valve as needed, so that two sets of redundant closed-loop control can be realized. One of the position detection device 15, the thermal flow sensor 8 or the differential pressure flow sensor 9 can be selected as the main control, and the other set can be selected as the backup. When the main control fails, it can be immediately switched to the backup control, thereby ensuring that the regulating valve can continue to work normally.

[0057] Regarding the positioner cylinder 12,

[0058] As shown in Figures 1 and 7, the positioner cylinder 12 includes a positioning cylinder body, a positioning piston 13 and a positioning piston rod 14. The positioning piston 13 is arranged in the positioning cylinder body. One end of the positioning piston rod 14 is connected to the positioning piston 13, and the other end extends out of the positioning cylinder body. The positioning piston 13 divides the chamber in the positioning cylinder body into a rod chamber and a rodless chamber.

[0059] Regarding actuator cylinder 5,

[0060] As shown in Figures 1 and 6, the actuator cylinder 5 includes an actuator cylinder body, an actuator piston 6 and an actuator piston rod 7. The actuator piston 6 is arranged in the actuator cylinder body. One end of the actuator piston rod 7 is connected to the actuator piston 6, and the other end extends out of the actuator cylinder body. The actuator piston 6 divides the chamber in the actuator cylinder body into a rod chamber and a rodless chamber.

[0061] Regarding the coordination between the positioner cylinder 12 and the actuator cylinder 5,

[0062] The rod chamber and rodless chamber of the positioner cylinder 12 and the actuator cylinder 5 are both equipped with oil pipe joints 16, and the oil pipe joints 16 of the two are connected through a hydraulic oil pipe 10. The actuator cylinder 5 and the throttling member 2 can be fixed in the valve body 1 through the oil pipe joint 16. The hydraulic oil pipe 10 can be a hard pipe or a soft pipe, and its length can be adjusted according to on-site needs.

[0063] In this embodiment, the cavity volume, cavity length, and piston rod stroke of the positioner cylinder 12 and the actuator cylinder 5 are equal, ensuring that the distance and speed of movement of the positioning piston rod 14 of the positioner cylinder 12 equal the distance and speed of movement of the valve core 3 by the actuating piston rod 7 of the actuator cylinder 5. In this embodiment, the positioner cylinder 12 and the actuator cylinder 5 are preferably of the same model, shape, and size, ensuring that the piston movement position of the positioning mechanism and the piston movement position of the actuator mechanism are completely aligned. The position information obtained from the positioning mechanism piston rod is identical to the position information from the actuator piston rod, and thus also identical to the position information of the valve core 3. The position information obtained by the displacement sensor on the positioning mechanism piston rod accurately represents the position information of the valve core 3, that is, the valve opening information.

[0064] Regarding the valve seat 4, throttle 2 and valve core 3,

[0065] As shown in FIG. 1 , 2 , 5 and 6 , the valve seat 4 is a streamlined valve seat 4 .

[0066] As shown in Figures 1, 2, 3 and 4, the throttling member 2 includes a front body 17 and a straight pipe section 18. The straight pipe section 18 is installed at one end of the front body 17 close to the valve body 1. The front body 17 is a rotating body with a first arc-shaped cross-section structure, and the straight pipe section 18 is a rotating body with a rectangular cross-section structure.

[0067] One end of the valve core 3 close to the valve seat 4 is a rotating body with a second arc-shaped cross-section structure, and the valve core 3 is slidably connected to one end of the throttling member 2 close to the valve seat 4 .

[0068] The actuator cylinder 5 is arranged between the valve core 3 and the throttle member 2, and the valve core 3 and the throttle member 2 cooperate to form a water drop-shaped structure.

[0069] In this embodiment, the dimension of the teardrop-shaped structure at the end away from the valve seat 4 is larger than the dimension of the end close to the valve seat 4 .

[0070] The teardrop-shaped throttling element 2 is designed and optimized using computational fluid dynamics (CFD) methods. In the flow field (velocity cloud diagram) at different valve openings, there is no flow separation or vortex. The flow field is very stable, further ensuring that the flow rate can be accurately measured in the valve body 1.

[0071] In some embodiments, simulation and optimization can also be performed by constructing a neural network.

[0072] By arranging the actuator cylinder 5 between the valve core 3 and the throttle member 2, the teardrop-shaped structure of the throttle member 2 and the valve core 3 will not be damaged, and the flow field in the valve is optimized. While ensuring measurement accuracy, the problem of the influence of the actuator in the prior art on the fluid mechanical structure of the throttle member 2 is solved.

[0073] Regarding the power device 11 , in this embodiment, the power device 11 is a linear stepping motor 111 , or is composed of a stepping motor 111 , a lead screw mechanism, and a guide rail mechanism.

[0074] In this embodiment, the output end of the linear stepping motor 111 is connected to the positioning piston rod 14 of the positioner cylinder 12 .

[0075] The power device 11 composed of a stepper motor 111, a screw mechanism and a guide rail mechanism is a stepper motor 111 connected to a screw rod 112 of the screw mechanism, a nut 113 is provided on the screw rod 112, the nut 113 is connected to the slider of the guide rail mechanism through a connecting piece, and the nut 113 and the slider are connected to the positioning piston rod 14 of the positioner cylinder 12 through a connecting piece.

[0076] Regarding the position detection device 15,

[0077] In this embodiment, the position detection device 15 is a displacement sensor provided on one side of the positioning piston rod 14 of the positioner cylinder 12 .

[0078] Working principle:

[0079] There are three closed-loop control modes:

[0080] 1) Since the position change information of the positioning piston rod 14 of the positioner cylinder 12 accurately reflects the position change information of the valve core 3 and thus accurately reflects the flow rate change, the output from the position detection device 15 is the object of closed-loop control.

[0081] 2) A thermal flow sensor 8 is installed at the straight pipe section 18 in the middle of the throttling member 2 of the axial flow valve in the valve body 1, and the output of the thermal flow sensor 8 is used as the object of closed-loop control.

[0082] 3) The output of the differential pressure flow sensor 9 is used as the closed-loop control object.

[0083] Redundant control can be achieved based on the above three closed-loop control methods:

[0084] According to needs, at least two sensors can be installed in a control valve to realize at least two sets of closed-loop control. The output of one sensor can be selected as the main control, and the other set can be selected as the backup. When the main control fails, it can be immediately switched to the backup control to ensure that the control valve can continue to work normally.

[0085] The positioner cylinder 12 is connected to the cavity of the actuator cylinder 5, so that the position information of the piston rod of the positioner cylinder 12 accurately represents the position information of the valve core 3, that is, the opening information of the valve, and can achieve accurate flow measurement in the valve body 1 and directly feed back to the controller.

[0086] Moreover, the hydraulic oil pressure signal generated by the piston of the positioner cylinder 12 can reach the actuator cylinder 5 instantly. Similarly, the hydraulic oil pressure signal generated by the piston of the actuator cylinder 5 can reach the positioner cylinder 12 instantly, and can accurately control the position of the valve core 3, that is, the valve opening. Therefore, the system has good dynamic characteristics and provides closed-loop control to form an axial flow regulating valve with hydraulic closed-loop control.

[0087] By precisely controlling the position of the valve core 3, the movement speed of the valve core 3 can be controlled, thereby adjusting the speed of the pressure change before and after the throttling member 2. Combined with the teardrop-shaped throttling member 2 and the streamlined design of the valve seat 4, the flow coefficient is increased, and noise and vibration can be significantly reduced. When the medium in the pipeline is liquid, the possibility of flash evaporation, cavitation and cavitation is reduced, which can meet the higher performance requirements of the control accuracy and rapid response of flow control valves put forward by the development of modern industry.

[0088] The positioner cylinder 12 and the cavity of the actuator cylinder 5 can be connected accordingly through the pipeline, which greatly reduces the volume of the connecting parts in the valve body 1, reduces the flow resistance, and reduces the impact on the flow state of the medium in the valve body 1, so that the structure of the valve body 1 is simple, and the material can be selected according to the needs of actual application, making the entire regulating valve lightweight. Moreover, the power transmission between the actuator in the valve body 1 and the positioner outside the valve body 1 is achieved through hydraulic pressure. There are no moving mechanical parts passing through the valve body 1. The hydraulic oil pipe 10 and the valve body 1 are welded or glued, so zero leakage can be achieved.

[0089] In the second embodiment, based on the first embodiment, the moving distance of the actuating piston rod 7 of the actuator cylinder 5 when the positioning piston rod 14 of the positioner cylinder 12 moves is adjusted.

[0090] In this embodiment, the cavity volumes of the positioner cylinder 12 are equal to those of the actuator cylinder 5, and the cavity length and piston rod stroke of the positioner cylinder 12 are N times the cavity length and piston rod stroke of the actuator cylinder 5, N>1, so that the distance moved by the actuator piston rod 7 of the actuator cylinder 5 = the distance moved by the positioning piston rod 14 of the positioner cylinder 12 / N.

[0091] In this embodiment, by making the cavity volumes of the two cylinders equal and then making the cavity length and piston rod stroke of the positioner cylinder 12 N times the cavity length and piston rod stroke of the actuator cylinder 5, the accuracy of the valve opening information can be amplified and the control accuracy of the valve opening can be improved.

[0092] For example:

[0093] When N=2,

[0094] When the valve core 3 needs to be moved 2 mm, the positioning piston rod 14 of the positioner cylinder 12 is moved 4 mm, and the actuator piston rod 7 of the actuator cylinder 5 drives the valve core 3 to move 2 mm;

[0095] When the valve core 3 needs to be moved by 0.25 mm, the positioning piston rod 14 of the positioner oil cylinder 12 needs to be moved by 0.5 mm, so that the actuating piston rod 7 of the actuating oil cylinder 5 can drive the valve core 3 to move by 0.25 mm.

[0096] When N=10,

[0097] When the valve core 3 needs to be moved 2 mm, the positioning piston rod 14 of the positioner cylinder 12 is moved 20 mm, which can make the actuator piston rod 7 of the actuator cylinder 5 drive the valve core 3 to move 2 mm;

[0098] When the valve core 3 needs to be moved by 0.25 mm, the positioning piston rod 14 of the positioner oil cylinder 12 needs to be moved by 2.5 mm, so that the actuating piston rod 7 of the actuating oil cylinder 5 can drive the valve core 3 to move by 0.25 mm.

[0099] Obviously, the difficulty of controlling the positioning piston rod 14 of the positioner oil cylinder 12 to move 2.5 mm is less than the difficulty of controlling the positioning piston rod 14 of the positioner oil cylinder 12 to move 0.5 mm, and the control accuracy can be further improved by increasing the multiple as needed.

[0100] In the third embodiment, the composition of the power unit 11 is adjusted based on the first or second embodiment.

[0101] The problem to be solved by this embodiment is: when the valve core 3 needs to move a long distance, especially after the embodiment in which the cavity length and piston rod stroke of the positioner cylinder 12 are N times the cavity length and piston rod stroke of the actuator cylinder 5, the stroke of the power device 11 composed of the linear stepper motor 111, or the stepper motor 111, the screw mechanism and the guide rail mechanism also needs to be increased accordingly. In particular, the power device 11 composed of the stepper motor 111 and the screw mechanism in the prior art is that the stepper motor 111 is connected to the screw rod 112 of the screw mechanism, and then the nut 113 threaded with the screw rod 112 is matched with the guide rail mechanism to connect with the positioning piston rod 14 of the positioner cylinder 12, so as to drive the positioning piston rod 14 of the positioner cylinder 12 to move. As the stroke increases, the length of the screw rod 112 and the guide rail mechanism also needs to increase accordingly, resulting in an increase in the stroke of the power device 11, which will lead to a substantial increase in the volume and cost of the entire control system of the regulating valve.

[0102] In order to solve the above problem, as shown in FIG9 , the power device 11 includes: a stepping motor 111 , a nut 113 , a screw rod 112 and a guide block 114 .

[0103] The nut 113 is installed in the stepping motor 111 , the screw rod 112 is threadedly connected to the nut 113 , and the screw rod 112 is connected to the positioning piston rod 14 of the positioner cylinder 12 .

[0104] The guide block 114 is mounted on the end of the stepping motor 111 .

[0105] A spline groove is provided on the threaded portion of the screw rod 112, and the guide block 114 is provided with a protrusion that cooperates with the spline groove. The screw rod 112 and the guide block 114 have a spline structure that cooperates. In the embodiment shown in Figure 1, two guide blocks 114 are provided, and the two guide blocks 114 are respectively at both ends of the stepping motor 111.

[0106] In this embodiment, the connection between the screw rod 112 and the positioning piston rod 14 of the positioner cylinder 12 can be through connecting parts such as screws or couplings, or a fixed connection structure such as welding, or the end of the positioning piston rod 14 can be extended and a threaded portion and a spline groove can be opened on the positioning piston rod 14, so that the end of the positioning piston rod 14 serves as an integrated structure of the screw rod 112.

[0107] In this embodiment, the nut 113 can be a planetary roller nut 113, so that the width of each spline is smaller than the radius of the roller of the planetary roller nut 113, thereby reducing the interference between the spline structure and the operation of the nut 113, and ensuring the stability of the operation of the screw rod 112.

[0108] By providing a spline groove on the threaded portion of the screw rod 112, the length of the screw rod 112 is greatly reduced. Moreover, by cooperating with the spline structure of the screw rod 112 and the guide block 114, the normal movement of the screw rod 112 can be ensured without eliminating the guide rail mechanism, thereby greatly reducing the volume and cost of the power device 11 when the stroke is increased, thereby greatly reducing the volume and cost of the entire control system of the regulating valve.

[0109] In a further embodiment, an electric actuator is used instead of a hydraulic cylinder, and a worm gear transmission mechanism is driven by an electric motor to achieve synchronous movement of the two pistons, which can reduce the complexity and cost of the hydraulic system and improve control accuracy and reliability.

[0110] The axial flow valve core structure is adopted, that is, a conical or spherical valve core is used to replace the two pistons, and the flow area is changed by the valve core rotating axially in the valve body. This can reduce the friction and wear inside the valve body and improve the life and stability of the valve.

[0111] In another embodiment of the present application, a split valve body structure is adopted, that is, the valve body is divided into two parts, one part is a fixed valve seat, and the other part is a movable valve core. The valve core can be easily disassembled and replaced, improving maintenance efficiency and flexibility.

[0112] In the fourth embodiment, the composition of the position detection device 15 is adjusted based on the third embodiment.

[0113] In the embodiment shown in FIG. 7 and FIG. 8 , the position detection device 15 is composed of an angle sensor 153 and a roller assembly.

[0114] The angle sensor 153 and the roller assembly are arranged at the end of the screw rod 112 away from the locator cylinder 12. The roller assembly is connected to the angle sensor 153. The roller assembly is used to provide support force for the screw rod 112. When the screw rod 112 drives the angle sensor 153 to move, the roller assembly rolls. The angle sensor 153 is used to detect the rotation angle of the roller 151, thereby detecting the position of the positioning piston rod 14 of the locator cylinder 12 and detecting the valve opening information.

[0115] In the embodiment shown in Figure 7, the roller assembly can be composed of at least one roller 151 and a support member 152. The support member 152 is a bracket for fixing the roller 151. The roller 151 is connected to the support member 152. The outer side of the roller 151 can be provided with an annular groove that cooperates with the screw rod 112. The roller 151 is spaced a predetermined distance from the stepper motor 111. The roller 151 is installed under the screw rod 112 and is against the screw rod 112. The roller 151 can be an elastic roller 151 with an elastic material such as rubber on the surface. The elastic material on the surface of the roller 151 and the thread on the surface of the screw rod 112 can prevent the roller 151 and the screw rod 112 from slipping, thereby ensuring detection accuracy.

[0116] The roller 151 can reduce the cantilever beam length of the screw rod 112, ensuring the working accuracy and stability of the screw rod 112. Moreover, the cooperation between the roller 151 and the angle sensor 153 can provide support force for the screw rod 112 while realizing the detection of the position of the positioning piston rod 14 of the positioner cylinder 12, realizing mechanism reuse and saving the cost of the displacement sensor compared with the first embodiment.

[0117] In the embodiment shown in Figure 8, the roller assembly can also be composed of at least one roller 151 and a support member 152, the roller 151 is connected to the screw rod 112, the angle sensor 153 is connected to the screw rod 112, the roller 151 is connected to the angle sensor 153, and the support member 152 is arranged below the end of the screw rod 112 away from the locator cylinder 12, the roller 151 and the support member 152 are against each other, and the roller 151 rolls on the support member 152.

[0118] The roller 151 may be an elastic roller 151 with elastic material such as rubber on its surface or a toothed roller 151 with teeth on its surface.

[0119] The support member 152 may be a flat plate that cooperates with the roller 151 , or a C-shaped steel having a groove for accommodating a portion of the roller 151 , or a rack that meshes with the toothed roller 151 .

[0120] Although this embodiment requires extending the support member 152 as the stroke of the positioner cylinder 12 increases, the cost of extending the length of the support member 152 is much lower than the cost of extending the guide rail mechanism with precision structure compared to the guide rail mechanism with balls inside to ensure its guiding function.

[0121] The roller 151 and the support member 152 abut against each other to provide support force to the end of the screw rod 112 away from the positioner cylinder 12, thereby avoiding the formation of a cantilever beam structure and ensuring the working accuracy and stability of the screw rod 112. Moreover, the cooperation between the roller 151 and the angle sensor 153 can provide support force to the screw rod 112 while realizing the detection of the position of the positioning piston rod 14 of the positioner cylinder 12, thereby realizing mechanism reuse and saving the cost of the displacement sensor compared with the first embodiment.

[0122] That is, whether the roller assembly is an embodiment in which the support 152 fixes the roller 151, or an embodiment in which the roller 151 is connected to the screw rod 112, it can provide support force for the screw rod 112 while realizing the detection of the position of the positioning piston rod 14 of the locator cylinder 12, thereby realizing mechanism reuse.

[0123] According to another aspect of the present application, a flow regulation system is provided, comprising the regulating valve described in any one of the above technical solutions.

[0124] As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself, and various changes in form and details may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A regulating valve, characterized in that: include: Valve body, valve seat, valve core, throttling element, actuator cylinder, positioner cylinder, power unit and position detection device; The valve seat and the throttling element are installed in the valve body, the cylinder body of the actuator cylinder is connected to the throttling element, the valve core is connected to the actuator piston rod of the actuator cylinder, the positioner cylinder is correspondingly connected to the cavity of the actuator cylinder, the power device is connected to the positioning piston rod of the positioner cylinder, and the position detection device cooperates with the positioning piston rod of the positioner cylinder; The cavity volume, cavity length and piston rod stroke of the positioner cylinder and the actuator cylinder are coordinated with each other; The power device is used to drive the positioning piston rod of the positioner cylinder to move, so that the actuator piston rod of the actuator cylinder drives the valve core to move relative to the valve seat, thereby realizing the control of the valve opening; The position detection device is used to detect the position of the positioning piston rod of the positioner cylinder to detect the valve opening information; The valve seat is a streamlined valve seat; The throttling element comprises a front body and a straight pipe section, wherein the straight pipe section is installed at one end of the front body close to the valve body, the front body is a first arc-shaped cross-section structure, and the straight pipe section is a rectangular cross-section structure; One end of the valve core close to the valve seat is a second arc-shaped cross-section structure, and the valve core is slidably connected to one end of the throttling member close to the valve seat; The actuator oil cylinder is arranged between the valve core and the throttling member, and the valve core and the throttling member cooperate to form a water drop-shaped structure.

2. The regulating valve according to claim 1, characterized in that: The cavity volume, cavity length and piston rod stroke of the positioner cylinder and the actuator cylinder are equal, so that the distance and speed of movement of the positioning piston rod of the positioner cylinder = the distance and speed of movement of the valve core driven by the actuator piston rod of the actuator cylinder.

3. The regulating valve according to claim 1, characterized in that: Also includes: The thermal flow sensor is installed in the valve body and is used to detect the flow rate of the fluid medium in the valve body.

4. The regulating valve according to claim 1, characterized in that: Also includes: A differential pressure flow sensor is installed in the valve body and is used to detect the flow rate of the fluid medium in the valve body; The power device is a linear stepping motor, or is composed of a stepping motor, a lead screw mechanism and a guide rail mechanism.

5. The regulating valve according to claim 1, characterized in that: The position detection device is a displacement sensor arranged on one side of the positioning piston rod of the positioner oil cylinder.

6. The regulating valve according to claim 1, characterized in that: The cavity volumes of the positioner cylinder and the actuator cylinder are equal, the cavity length and piston rod stroke of the positioner cylinder are N times the cavity length and piston rod stroke of the actuator cylinder, N>1, so that the distance moved by the actuator piston rod of the actuator cylinder = the distance moved by the positioning piston rod of the positioner cylinder / N.

7. The regulating valve according to claim 1, characterized in that: The power device comprises: a stepping motor, a nut, a lead screw and a guide block; The nut is installed in the stepper motor, the screw rod is threadedly connected to the nut, and the screw rod is connected to the positioning piston rod of the positioner cylinder; The guide block is installed at the end of the stepper motor; A spline groove is provided on the threaded portion of the screw rod, and a protrusion matched with the spline groove is provided on the guide block, and the screw rod is matched with the spline structure of the guide block.

8. The regulating valve according to claim 7, characterized in that: The position detection device is composed of an angle sensor and a roller assembly; The angle sensor and roller assembly are arranged at one end of the screw rod away from the positioner cylinder. The roller assembly is connected to the angle sensor. The roller assembly is used to provide support force for the screw rod. When the screw rod drives the angle sensor to move, the roller assembly rolls. The angle sensor is used to detect the rotation angle of the roller, thereby detecting the position of the positioning piston rod of the positioner cylinder and detecting the valve opening information.

9. A flow regulation system, characterized in that: A regulating valve comprising the control valve according to any one of claims 1 to 8.

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