Pressure regulating valve and control method for non-full pipe flow

Abstract

The embodiment of the invention discloses a pressure regulating valve and a non-full pipe flow prevention and control method, relates to the technical field of filling pipelines, and can realize full pipe flow conveying of the filling pipelines. The pressure regulating valve comprises a valve body, a valve element and a thrust device. The valve body is provided with a valve cavity, a feeding port and a discharging port. The valve element is located in a valve cavity of the valve body, and fluid flowing through the valve cavity can generate fluid pressure on the valve element. The thrust device is connected with the valve body and can apply preset thrust to the valve element. The valve element can move relative to the valve body under the action of the preset thrust and the fluid pressure so as to regulate and control fluid flowing through the valve cavity. The preset thrust is configured to enable full-pipe-flow conveying of the filling pipeline. The method is suitable for mine filling mining scenes.

Description

Technical Field

[0001] The present application relates to the technical field of filling pipelines, and particularly relates to a pressure regulating valve and a method for preventing and controlling non-full pipe flow. Background Art

[0002] With the continuous mining of coal mining faces and the increase in the mining depth of mines, the effective static head in the slurry pipeline transportation process is much greater than the pipeline transportation resistance. The excess static head generated by the slurry in the vertical pipeline will bring huge transportation pressure, making it easy for the pipeline to have non-full pipe flow, which will cause accidents such as local wear of the pipeline, pipeline vibration, pipeline blockage, and even damage to the filling pump. Therefore, how to reduce the excessive transportation pressure generated by the height difference to a controllable range and ensure the full pipe flow transportation of the filling slurry in the pipeline has become a bottleneck in the filling mining technology. Summary of the Invention

[0003] In view of this, the present application provides a pressure regulating valve and a method for preventing and controlling non-full pipe flow, which can achieve full pipe flow transportation of the filling pipeline.

[0004] In a first aspect, an embodiment of the present application provides a pressure regulating valve, which is applied to a slurry filling system. The slurry filling system includes a hopper, a filling pump, and a filling pipeline. The filling pump is used to transport the slurry in the hopper to a target area through the filling pipeline. The filling pipeline is configured with the pressure regulating valve. The pressure regulating valve includes: a valve body, which is provided with a valve cavity, a feed port, and a discharge port; a valve core, which is located in the valve cavity of the valve body, and the fluid flowing through the valve cavity can generate fluid pressure on the valve core; a thrust device, which is connected to the valve body and can apply a preset thrust to the valve core. Wherein, under the action of the preset thrust and the fluid pressure, the valve core can move relative to the valve body to regulate the fluid flowing through the valve cavity. The preset thrust is configured to enable full pipe flow transportation of the filling pipeline. If the fluid pressure is less than the preset thrust, the valve core moves towards the first side of the valve body to reduce the flow area of the fluid flowing from the feed port to the discharge port. If the fluid pressure is greater than the preset thrust, the valve core moves towards the second side of the valve body to increase the flow area of the fluid flowing from the feed port to the discharge port.

[0005] In a specific implementation, the thrust device is a hydraulic cylinder, and the hydraulic cylinder includes a cylinder body and a piston rod passing through the cylinder body. The first end of the piston rod is located inside the cylinder body and is provided with a piston, and the second end of the piston rod extends into the valve body and is connected to the valve core. The hydraulic cylinder is provided with an oil inlet and an oil outlet, and the oil outlet is provided with an overflow valve.

[0006] In a specific embodiment, the valve body is provided with a guide hole, a guide cylinder is disposed through the guide hole, the piston rod passes through the guide cylinder, and the second end of the piston rod extends into the valve body.

[0007] In a specific embodiment, the valve body is provided with a first pressure detection member for detecting the pressure of the fluid flowing in from the feed port; and / or the hydraulic cylinder is provided with a second pressure detection member for detecting the hydraulic oil pressure in the hydraulic cylinder.

[0008] In a specific embodiment, a pressure regulating device is further included. The pressure regulating device is communicatively connected to the first pressure detection member and / or the second pressure detection member to adjust the oil supply to the hydraulic cylinder and / or adjust the relief valve according to the measured value of the first pressure detection member and / or the measured value of the second pressure detection member, so that the hydraulic oil pressure in the hydraulic cylinder is adjusted to enable the filling pipeline to be full-pipe flow transported.

[0009] In a specific embodiment, the valve core is provided with a flow guiding structure; the flow guiding structure smoothly transitions from the feed port to the discharge port; and / or the flow guiding structure is arc-shaped; and / or the flow guiding structure is made of wear-resistant and corrosion-resistant material; and / or the flow guiding structure is provided with a silicon carbide coating.

[0010] In a specific embodiment, the valve core moves relative to the valve body, and the flow area of the fluid flowing from the feed port to the discharge port gradually changes; and / or the valve core has at least a first working position and a second working position. When the valve core is in the first working position, the fluid flowing from the feed port to the discharge port has a first flow area, and when the valve core is in the second working position, the fluid flowing from the feed port to the discharge port has a second flow area, wherein the first flow area is smaller than the second flow area.

[0011] In a second aspect, an embodiment of the present application further provides a method for preventing and controlling non-full-pipe flow. The method for preventing and controlling non-full-pipe flow includes: Closing the pressure regulating valve of the filling pipeline located underground and opening the air release valve of the filling pipeline located above ground, wherein the pressure regulating valve is any one of the pressure regulating valves in the embodiments of the present application; Injecting a first fluid into the filling pipeline to the top of the vertical pipe section of the filling pipeline to discharge the gas in the filling pipeline; Setting the thrust device of the pressure regulating valve so that the thrust device can apply a preset thrust to the valve core; Injecting a second fluid into the filling pipeline to isolate the injected first fluid, and then injecting slurry into the filling pipeline to fill the target area; Inject a third fluid into the filling pipeline to isolate the injected slurry, and then inject a fourth fluid into the filling pipeline to clean the filling pipeline, thus ending the filling operation.

[0012] In a specific implementation, in the step of injecting slurry into the filling pipeline, the method further includes: observing the air release valve, and if gas emerges from the air release valve, increasing the preset thrust of the thrust device so that the filling pipeline can achieve full-pipe flow transportation.

[0013] In a specific implementation, after injecting the first fluid into the top of the vertical pipe section of the filling pipeline, the method further includes: obtaining the pressure measurement value of the first fluid flowing into the feed port of the pressure regulating valve, and based on the pressure measurement value of the first fluid, setting the thrust device of the pressure regulating valve so that the thrust device can apply a preset thrust to the valve core; wherein, the preset thrust is configured to enable the filling pipeline to achieve full-pipe flow transportation; if the fluid pressure generated by the slurry flowing through the valve cavity on the valve core is less than the preset thrust, the valve core moves towards the first side of the valve body, so that the flow area of the slurry flowing from the feed port to the discharge port becomes smaller; if the fluid pressure generated by the slurry flowing through the valve cavity on the valve core is greater than the preset thrust, the valve core moves towards the second side of the valve body, so that the flow area of the slurry flowing from the feed port to the discharge port becomes larger.

[0014] The pressure regulating valve and the method for preventing and controlling non-full pipe flow provided by the embodiments of the present application are applied to a slurry filling system. The slurry filling system includes a hopper, a filling pump, and a filling pipeline. The filling pump is used to transport the slurry in the hopper to a target area through the filling pipeline. The filling pipeline is configured with a pressure regulating valve, and the pressure regulating valve includes: a valve body, a valve core, and a thrust device; the valve body is provided with a valve cavity, a feed port, and a discharge port; the valve core is located in the valve cavity of the valve body, and the fluid flowing through the valve cavity can generate a fluid pressure on the valve core; the thrust device is connected to the valve body and can apply a preset thrust to the valve core; wherein, under the action of the preset thrust and the fluid pressure, the valve core can move relative to the valve body to regulate the fluid flowing through the valve cavity, and the preset thrust is configured to enable the filling pipeline to transport in a full pipe flow; if the fluid pressure is less than the preset thrust, the valve core moves towards the first side of the valve body to reduce the flow area of the fluid flowing from the feed port to the discharge port; if the fluid pressure is greater than the preset thrust, the valve core moves towards the second side of the valve body to increase the flow area of the fluid flowing from the feed port to the discharge port. In this way, after installing the pressure regulating valve on the filling pipeline of the slurry filling system and setting a preset thrust for the pressure regulating valve so that the fluid pressure generated by the slurry flowing from the feed port to the discharge port on the valve core is balanced with the preset thrust, and the filling pipeline can transport in a full pipe flow, if the fluid pressure generated by the slurry flowing from the feed port to the discharge port changes, the opening and closing position of the valve core can be dynamically adjusted according to the change in the fluid pressure of the slurry flowing into the valve cavity, so that the flow rate or resistance of the slurry flowing into the valve cavity can be dynamically adjusted, thereby realizing the full pipe flow transportation of the filling pipeline; in addition, the pressure regulating valve is convenient to install and arrange at the filling construction site, which is beneficial to reducing the filling cost and operation intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Schematic diagram of a pressure regulating valve provided by an embodiment of the present application; Figure 2 Schematic diagram of the moving position of the valve core of a pressure regulating valve provided by an embodiment of the present application; Figure 3 Schematic flow chart of a method for preventing and controlling non-full pipe flow provided by an embodiment of the present application; Figure 4 Schematic construction layout diagram of a method for preventing and controlling non-full pipe flow provided by an embodiment of the present application.

[0017] Main reference numeral descriptions: 10 - Pressure regulating valve; 11 - Valve body; 110 - Valve cavity; 111 - Feed port; 112 - Discharge port; 113 - First flange; 114 - Second flange; 115 - Guide cylinder; 12 - Valve core; 13 - Thrust device; 131 - Cylinder block; 132 - Piston rod; 133 - Piston; 134 - Oil inlet; 135 - Oil outlet; 136 - Relief valve; 14 - First pressure detection component; 15 - Second pressure detection component; 20 - Hopper; 30 - Filling pump; 40 - Air release valve; 50 - Filling pipeline; 60 - Target area. Detailed implementation manners

[0018] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0019] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0020] Since in the current prevention and control methods for the non-full pipe flow of the filling pipeline, increasing the laying length of the horizontal pipeline will inevitably increase the pipeline installation strength and increase the filling cost. In addition, for the filling slurry to meet the requirements of stable long-distance transportation, its mass concentration will not change much, and it is difficult to prevent non-full pipe flow by increasing the concentration of the filling slurry. By changing the inner diameter of the pipeline, for example, reducing the diameter of the horizontal pipeline to obtain a high-pressure full pipe flow transportation system, or reducing the diameter of the vertical pipeline to obtain a low-pressure full pipe flow transportation system, but changing the pipe diameter will inevitably cause a change in the flow velocity of the slurry in the pipeline, thereby increasing the wear of the slurry on the variable diameter pipe section. Therefore, the current prevention and control methods for the non-full pipe flow of the filling pipeline have poor adaptability, high filling cost, and high operation intensity. To solve the above problems, on the one hand, as Figure 1 shown, the embodiment of the present application provides a pressure regulating valve 10, which is applied to a slurry filling system. The slurry filling system includes a hopper 20, a filling pump 30, and a filling pipeline 50. The filling pump 30 is used to transport the slurry in the hopper 20 to the target area 60 through the filling pipeline 50. The filling pipeline 50 is configured with this pressure regulating valve 10. The pressure regulating valve 10 may include: a valve body 11, a valve core 12, and a thrust device 13.

[0021] The valve body 11 is provided with a valve cavity 12, a feed inlet 111 and a discharge outlet 112; fluids such as slurry, water, etc. can enter the valve cavity 12 from the feed inlet 111 of the valve body 11 and flow out from the discharge outlet 112. The feed inlet 111 can be connected to a feed pipeline, and the discharge outlet 112 can be connected to a discharge pipeline. The shape and structure of the valve body 11 can be adaptively designed according to the operating conditions. For example, the shape and structure of the valve body 11 can be designed to be adapted to the feed pipeline and the discharge pipeline. A first flange 113 is provided at the position of the feed inlet 111 of the valve body 11, and a second flange 114 is provided at the position of the discharge outlet 112 to facilitate the installation, disassembly and repair operations of the pressure regulating valve 10, etc.

[0022] The number of the feed inlet 111 and the discharge outlet 112 can be one each to meet the use requirements of a single slurry or a single conveying line. In some embodiments, there can be multiple feed inlets 111 and multiple discharge outlets 112. For example, multiple feed inlets 111 are configured so that the slurries from multiple feed pipelines are converged by the pressure regulating valve 10 and output from the discharge outlet 112; or multiple discharge outlets 112 are configured so that the slurry can be conveyed to multiple discharge pipelines by multiple discharge outlets 112 after passing through the valve cavity 12 of the pressure regulating valve 10.

[0023] The valve core 12 is located in the valve cavity 12 of the valve body 11, and the fluid flowing through the valve cavity 12 can generate a fluid pressure on the valve core 12. The valve core 12 located in the valve cavity 12 can control the fluid flowing through the valve cavity 12 by different opening degrees or opening states to adjust the flow rate, resistance, flow velocity or pressure, etc. of the fluid. In this embodiment, the valve core 12 is designed such that the fluid flowing through the valve cavity 12 can generate a fluid pressure on the valve core 12, so that the pressure change of the fluid flowing through the valve cavity 12 can act on the valve core 12 at any time. If the pressure of the fluid flowing through the valve cavity 12 is large, the valve core 12 will be subjected to a large fluid pressure. If the pressure of the fluid flowing through the valve cavity 12 is small, the valve core 12 will be subjected to a small fluid pressure. The shape and structure of the valve core 12 can be suitable for the valve cavity 12 so that the valve core 12 can be movably arranged in the valve cavity 12 to realize different opening degrees or opening states relative to the valve body 11, thereby regulating and controlling the fluid flowing through the valve cavity 12.

[0024] The thrust device 13 is connected to the valve body 11 and can apply a preset thrust to the valve core 12. Among them, under the action of the preset thrust and fluid pressure, the valve core 12 can move relative to the valve body 11 to regulate the fluid flowing through the valve cavity 12. The preset thrust is configured to enable the filling pipeline 50 to be fully filled with fluid for transportation. If the fluid pressure is less than the preset thrust, the valve core 12 moves towards the first side of the valve body 11, so that the flow area of the fluid flowing from the feed port 111 to the discharge port 112 becomes smaller. If the fluid pressure is greater than the preset thrust, the valve core 12 moves towards the second side of the valve body 11, so that the flow area of the fluid flowing from the feed port 111 to the discharge port 112 becomes larger. As Figure 1 shown, under the action of the preset thrust and fluid pressure, the valve core 12 is in a certain equilibrium state. If the fluid pressure received by the valve core 12 becomes smaller or the preset thrust received by the valve core 12 becomes larger, the valve core 12 can move relative to the valve body 11, from Figure 1 the position shown to Figure 2 the position shown.

[0025] In this embodiment, the fluid flowing through the valve cavity 12 can generate fluid pressure on the valve core 12, and the thrust device 13 connected to the valve body 11 can also apply a preset thrust to the valve core 12. For example, the fluid flowing through the valve cavity 12 generates fluid pressure on the first side of the valve core 12, and the thrust device 13 can apply a preset thrust on the second side of the valve core 12. If the fluid pressure is greater than the preset thrust, the valve core 12 can move towards the second side of the valve body 11. If the fluid pressure is less than the preset thrust, the valve core 12 can move towards the first side of the valve body 11. In this way, the opening and closing position of the valve core 12 can be dynamically adjusted according to the fluid pressure flowing into the valve cavity 12, and further the fluid flow rate or resistance flowing into the valve cavity 12 can be dynamically adjusted to ensure that the fluid is in a fully filled state during transportation in the pipeline.

[0026] The thrust device 13 that applies a preset thrust to the valve core 12 can adopt various structural forms, such as an elastic mechanical structure or a hydraulic mechanism, etc. The preset thrust can be flexibly adjusted according to the operating conditions of the pressure regulating valve 10. For example, for the filling pipeline 50 configured with this pressure regulating valve 10, if the filling pipeline 50 has a large conveying pressure under the rated working state, the preset thrust of the thrust device 13 can be set larger. If the filling pipeline 50 has a small conveying pressure under the rated working state, the preset thrust of the thrust device 13 can be set smaller, so that the preset thrust is adapted to the conveying pressure of the filling pipeline 50 under the rated working state.

[0027] In addition, during the process of the filling pipeline 50 transporting the slurry, if the fluid pressure of the slurry transported by the filling pipeline 50 changes, the preset thrust of the thrust device 13 can be finely adjusted according to the change in the fluid pressure to meet the actual on-site usage requirements. For example, if the filling pipeline 50 experiences a situation of non-full pipe flow and the fluid pressure of the slurry becomes smaller, the preset thrust of the thrust device 13 can be finely adjusted to increase, so as to reduce the opening degree of the valve core 12 and increase the resistance of the pressure regulating valve 10 to the slurry, enabling the filling pipeline 50 to return to the full pipe flow transportation state.

[0028] The pressure regulating valve 10 provided by the embodiment of the present application is applied to a slurry filling system. The slurry filling system includes a hopper 20, a filling pump 30, and a filling pipeline 50. The filling pump 30 is used to transport the slurry in the hopper 20 to the target area 60 through the filling pipeline 50. The filling pipeline 50 is configured with a pressure regulating valve 10, and the pressure regulating valve 10 includes: a valve body 11, a valve core 12, and a thrust device 13; the valve body 11 is provided with a valve cavity 12, a feed inlet 111, and a discharge outlet 112; the valve core 12 is located in the valve cavity 12 of the valve body 11, and the fluid flowing through the valve cavity 12 can generate a fluid pressure on the valve core 12; the thrust device 13 is connected to the valve body 11 and can apply a preset thrust to the valve core 12; wherein, under the action of the preset thrust and the fluid pressure, the valve core 12 can move relative to the valve body 11 to regulate the fluid flowing through the valve cavity 12, and the preset thrust is configured to enable the filling pipeline 50 to perform full pipe flow transportation; if the fluid pressure is less than the preset thrust, the valve core 12 moves towards the first side of the valve body 11, so that the flow area of the fluid flowing from the feed inlet 111 to the discharge outlet 112 becomes smaller; if the fluid pressure is greater than the preset thrust, the valve core 12 moves towards the second side of the valve body 11, so that the flow area of the fluid flowing from the feed inlet 111 to the discharge outlet 112 becomes larger. In this way, after installing the pressure regulating valve 10 on the filling pipeline 50 of the slurry filling system and setting a preset thrust for the pressure regulating valve 10 so that the fluid pressure generated by the slurry flowing from the feed inlet 111 to the discharge outlet 112 on the valve core 12 is balanced with the preset thrust, and the filling pipeline 50 can perform full pipe flow transportation, if the fluid pressure generated by the slurry flowing from the feed inlet 111 to the discharge outlet 112 on the valve core 12 changes, the opening and closing position of the valve core 12 can be dynamically adjusted according to the change in the fluid pressure of the slurry flowing into the valve cavity, so that the flow rate or resistance of the slurry flowing into the valve cavity can be dynamically adjusted, thereby realizing the full pipe flow transportation of the filling pipeline 50; in addition, the pressure regulating valve 10 is convenient to install and arrange at the filling construction site, which is beneficial to reducing the filling cost and operation intensity.

[0029] Optionally, in an embodiment of the present application, as Figure 1 、 Figure 2As shown, the thrust device 13 is a hydraulic cylinder, which includes a cylinder block 131 and a piston rod 132 passing through the cylinder block 131; the first end of the piston rod 132 is located inside the cylinder block 131 and is provided with a piston 133, and the second end of the piston rod 132 extends into the valve body 11 and is connected to the valve core 12; the hydraulic cylinder is provided with an oil inlet 134 and an oil outlet 135, and an overflow valve 136 is provided at the oil outlet 135.

[0030] In this embodiment, the thrust device 13 of the hydraulic cylinder is used to drive the valve core 12 to move by converting hydraulic energy into mechanical energy. Specifically, the hydraulic cylinder can adopt a plunger type to facilitate the linear movement of the piston rod 132 to push the valve core 12 and improve the response speed of the valve core 12. The oil inlet 134 and the oil outlet 135 of the hydraulic cylinder can be arranged on the cylinder block 131, and a proportional overflow valve 136 can be configured at the oil outlet 135 to improve the control accuracy and sensitivity of the hydraulic oil pressure in the hydraulic cylinder. The oil inlet 134 of the hydraulic cylinder can be connected to a hydraulic station or an emulsion pump station, and the oil outlet 135 of the hydraulic cylinder can be connected to an oil tank.

[0031] After setting the overflow pressure of the overflow valve 136, if the hydraulic oil pressure in the hydraulic cylinder exceeds the set pressure, the overflow valve 136 will open and overflow, so that the hydraulic oil pressure in the hydraulic cylinder will return to the set pressure. In this way, the hydraulic oil pressure in the hydraulic cylinder can be maintained at the set pressure. At this set pressure, a stable hydraulic force is generated on the piston 133, that is, a stable preset thrust is generated on the valve core 12 of the pressure regulating valve 10 by the piston rod 132.

[0032] The thrust device 13 of the pressure regulating valve 10 adopts a hydraulic cylinder. During use, the fluid flowing through the valve cavity 12 of the pressure regulating valve 10 generates a fluid pressure on the first side of the valve core 12. Under the hydraulic action, the piston 133 of the hydraulic cylinder pushes the piston rod 132 to move, and the piston rod 132 can apply a preset thrust to the second side of the valve core 12. If the fluid pressure is greater than the preset thrust, the valve core 12 can move to the second side of the valve body 11. If the fluid pressure is less than the preset thrust, the valve core 12 can move to the first side of the valve body 11. In this way, the opening and closing position of the valve core 12 can be dynamically adjusted according to the fluid pressure flowing into the valve cavity 12, and further, the fluid flow rate or resistance flowing into the valve cavity 12 can be dynamically adjusted to ensure that the fluid is in a full-pipe flow state in the pipeline.

[0033] The hydraulic cylinder can be fixedly connected to the valve body 11 of the pressure regulating valve 10. For example, the cylinder block 131 of the hydraulic cylinder can be fixedly connected to the valve body 11 of the pressure regulating valve 10 by bolts, which is convenient for the installation and disassembly of each component of the pressure regulating valve 10.

[0034] In order to better guide the piston rod 132 of the hydraulic cylinder during the process of pushing the valve core 12, optionally, in an embodiment of the present application, as Figure 1As shown, the valve body 11 is provided with a guide hole, through which a guide cylinder 115 is inserted. The piston rod 132 passes through the guide cylinder 115, and the second end of the piston rod 132 extends into the valve body 11.

[0035] The guide hole provided in the valve body 11 can form an auxiliary support for the piston rod 132, making the force on the piston rod 132 more stable. In this way, the piston rod 132 can reciprocate more smoothly, avoiding jamming, thereby improving the sensitivity and reliability of the movement of the valve core 12. In addition, a guide cylinder 115 is also inserted in the guide hole of this embodiment. The portion of the guide cylinder 115 in contact with the piston rod 132 can have a high smoothness or adopt lubrication measures to reduce the movement resistance of the piston rod 132 and further improve the sensitivity of the movement of the piston rod 132 and the valve core 12. The guide cylinder 115 can also be made of wear-resistant materials to improve the wear resistance and service life of the portion of the guide cylinder 115 in contact with the piston rod 132.

[0036] Optionally, in an embodiment of the present application, as Figure 1 shown, the valve body 11 is provided with a first pressure detection member 14 for detecting the pressure of the fluid flowing in from the feed port 111; and / or the hydraulic cylinder is provided with a second pressure detection member 15 for detecting the pressure of the hydraulic oil in the hydraulic cylinder.

[0037] The first pressure detection member 14 and the second pressure detection member 15 can adopt pressure sensors and can transmit the measured pressure signals outward, so as to make corresponding control schemes or control actions according to the measured values of the first pressure detection member 14 and the second pressure detection member 15. Specifically, the first pressure detection member 14 can be arranged at a position of the valve body 11 close to the feed port 111, and the second pressure detection member 15 can be arranged at one end of the cylinder block 131 away from the piston rod 132. Among them, the measured values of the first pressure detection member 14 and the second pressure detection member 15 can be characterized by pressure as a physical quantity or by pressure as a physical quantity.

[0038] Optionally, in an embodiment of the present application, a pressure regulating device is further included. The pressure regulating device is communicatively connected to the first pressure detection member 14 and / or the second pressure detection member 15 to adjust the oil supply of the hydraulic cylinder and / or adjust the overflow valve 136 according to the measured value of the first pressure detection member 14 and / or the measured value of the second pressure detection member 15, so that the pressure of the hydraulic oil in the hydraulic cylinder is adjusted to enable the filling pipeline 50 to be full-pipe flow transported.

[0039] In this embodiment, through the pressure regulating device, the automatic regulation of the pressure regulating valve 10 can be realized. After the first pressure detecting member 14 and the second pressure detecting member 15 transmit the detected measured values to the pressure regulating device, the pressure regulating device can, according to the preset control strategy, change the hydraulic oil pressure in the regulating hydraulic cylinder by regulating the oil supply of the hydraulic cylinder or the overflow pressure of the overflow valve 136, so as to adjust the magnitude of the preset thrust of the piston rod 132 on the valve core 12. For example, if the filling pipeline 50 has a situation of non-full pipe flow, the fluid pressure of the slurry becomes smaller, causing the measured value of the first pressure detecting member 14 to become smaller. The pressure regulating device can, according to the preset control strategy, further increase the overflow pressure of the overflow valve 136, and adjust the oil supply situation of the hydraulic cylinder, such as increasing the oil supply pressure of the hydraulic cylinder, so as to increase the hydraulic oil pressure in the hydraulic cylinder, making the preset thrust of the piston rod 132 on the valve core 12 increase, and the valve core 12 move to reduce the opening degree, increasing the resistance of the pressure regulating valve 10 to the slurry, so that the filling pipeline 50 resumes the full pipe flow conveying state. Another example is that if the filling pipeline 50 has a situation of non-full pipe flow, and the measured value of the second pressure detecting member 15 becomes smaller, that is, the hydraulic oil in the hydraulic cylinder may lose pressure. The pressure regulating device can, according to the preset control strategy, adjust the oil supply situation of the hydraulic cylinder, such as increasing the oil supply pressure of the hydraulic cylinder, so as to increase the hydraulic oil pressure in the hydraulic cylinder, making the preset thrust of the piston rod 132 on the valve core 12 increase, and the valve core 12 move to reduce the opening degree, increasing the resistance of the pressure regulating valve 10 to the slurry, so that the filling pipeline 50 resumes the full pipe flow conveying state.

[0040] Furthermore, the pressure regulating device of this embodiment can, based on the Bernoulli equation and the fuzzy control algorithm, realize the dynamic stepless regulation of the axial movement of the piston rod 132 of the hydraulic cylinder, so that the opening degree of the valve core 12 of the pressure regulating valve 10 always matches the slurry flow rate and pressure, thereby maintaining the constant pressure full pipe flow state in the filling pipeline 50.

[0041] Optionally, in an embodiment of the present application, the valve core 12 is provided with a flow guiding structure; the flow guiding structure smoothly transitions from the feed port 111 to the discharge port 112; and / or the flow guiding structure is arc-shaped; and / or the flow guiding structure is made of wear-resistant and corrosion-resistant materials; and / or the flow guiding structure is provided with a silicon carbide coating.

[0042] The flow guiding structure of the valve core 12 is beneficial to guiding the fluid flowing through the valve cavity 12. The flow guiding structure smoothly transitions from the feed port 111 to the discharge port 112. Specifically, the flow guiding structure can be arc-shaped so that the fluid flowing in from the feed port 111 of the pressure regulating valve 10 can be smoothly guided to the discharge port 112. The flow guiding structure can be an integrally formed structure on the valve core 12 or a detachable and replaceable structure. To improve the service life, the flow guiding structure is made of wear-resistant and corrosion-resistant materials, or a reaction-sintered silicon carbide coating is provided on the surface of the flow guiding structure to enhance the erosion resistance performance and extend the service life.

[0043] Optionally, in an embodiment of the present application, the valve core 12 moves relative to the valve body 11, and the flow area of the fluid flowing from the feed port 111 to the discharge port 112 changes gradually; and / or the valve core 12 has at least a first working position and a second working position. When the valve core 12 is in the first working position, the fluid flowing from the feed port 111 to the discharge port 112 has a first flow area, and when the valve core 12 is in the second working position, the fluid flowing from the feed port 111 to the discharge port 112 has a second flow area, where the first flow area is smaller than the second flow area.

[0044] In this embodiment, the valve core 12 can be designed such that during the movement of the valve core 12 relative to the valve body 11, the flow area of the fluid flowing from the feed port 111 to the discharge port 112 changes gradually, enabling the pressure regulating valve 10 to perform stepless regulation of the fluid. Here, the flow area refers to the effective cross-sectional area of the fluid flowing inside the pressure regulating valve 10, that is, in the fluid flow direction, the effective cross-sectional area perpendicular to the flow direction. For example, the valve core 12 can be designed such that during the process of the piston rod 132 extending out of the cylinder block 131 to push the valve core 12 to move relative to the valve body 11, the opening degree of the valve core 12 gradually decreases, that is, the flow area of the fluid flowing from the feed port 111 to the discharge port 112 gradually decreases. During the process of the piston rod 132 retracting into the cylinder block 131 to drive the valve core 12 to move relative to the valve body 11, the opening degree of the valve core 12 gradually increases, that is, the flow area of the fluid flowing from the feed port 111 to the discharge port 112 gradually increases, thereby realizing the stepless regulation of the fluid flowing through the valve cavity 12 by the pressure regulating valve 10.

[0045] In another embodiment, the valve core 12 can also be designed to have multiple adjustment gears. For example, the valve core 12 has at least a first working position and a second working position. When the valve core 12 is in the first working position, the fluid flowing from the feed port 111 to the discharge port 112 has a first flow area, and when the valve core 12 is in the second working position, the fluid flowing from the feed port 111 to the discharge port 112 has a second flow area, where the first flow area is smaller than the second flow area, so as to realize the multi-stage regulation of the fluid by the pressure regulating valve 10 in steps.

[0046] In a second aspect, an embodiment of the present application further provides a method for preventing and controlling non-full pipe flow, which can realize the stable flow and full pipe transportation of the filling pipeline 50.

[0047] As Figure 3 shown, the method for preventing and controlling non-full pipe flow provided by the embodiment of the present application may include: S1. Close the pressure regulating valve 10 of the filling pipeline 50 located underground, and open the air release valve 40 of the filling pipeline 50 located above the ground, where the pressure regulating valve 10 is any one of the pressure regulating valves 10 in the embodiment of the present application.

[0048] As Figure 4As shown, in the design of the filling pipeline 50, the pipelines successively connected to the filling pump 30 include a straight ground pipeline, a vertical pipeline in the formation, and a straight underground pipeline. There are two flow forms in the pipeline with vertical downward feeding: the upper part is a free-falling section (non-full pipe section), and the lower part is a full pipe section. Therefore, in order to avoid the occurrence of negative pressure non-full pipe flow phenomenon, in this embodiment, the pressure regulating valve 10 is installed at the lower end position of the vertical pipeline located underground, or the pressure regulating valve 10 is installed at a suitable position of the straight underground pipeline. In this embodiment, an initial thrust for closing the valve core 12 can be applied to the thrust device 13 of the pressure regulating valve 10. For example, for the thrust device 13 using a hydraulic cylinder, an initial hydraulic oil pressure can be set in the hydraulic cylinder, and the piston rod 132 pushes the valve core 12 of the pressure regulating valve 10, so that the valve core 12 moves to the first side of the valve body 11 to the closed position to close the pressure regulating valve 10; when the thrust device 13 is reset to a preset thrust according to the on-site construction conditions, if the fluid pressure generated by the fluid on the first side of the valve core 12 of the pressure regulating valve 10 is greater than the preset thrust, the valve core 12 will move to the second side of the valve body 11 to open the pressure regulating valve 10. In some other embodiments, a valve plate for closing or opening can be further provided for the pressure regulating valve 10.

[0049] S2. Inject a first fluid into the filling pipeline 50 to the top of the vertical pipe section of the filling pipeline 50 to discharge the gas in the filling pipeline 50.

[0050] Since the pressure regulating valve 10 located underground is closed and the air release valve 40 located above the well is opened, injecting a first fluid into the filling pipeline 50 to the top of the vertical pipe section of the filling pipeline 50 can discharge the gas in the filling pipeline 50. The first fluid can be any fluid. Preferably, the first fluid is water to reduce the construction cost.

[0051] S3. Set the thrust device 13 of the pressure regulating valve 10 so that the thrust device 13 can apply a preset thrust to the valve core 12.

[0052] In this embodiment, a thrust device 13 of the pressure regulating valve 10 is provided so that the thrust device 13 can apply a preset thrust to the valve core 12. When setting the preset thrust of the thrust device 13 of the pressure regulating valve 10, it can be set according to the fluid pressure generated by the first fluid on the pressure regulating valve 10, or it can be set according to construction experience or theoretical calculation, so that the preset thrust is adapted to the fluid pressure of the slurry conveyed by the filling pipeline 50 during the filling operation. In this way, when the fluid pressure generated by the fluid flowing through the valve cavity 12 on the first side of the valve core 12 is less than the preset thrust, the valve core 12 can move towards the first side of the valve body 11 to reduce the opening degree; when the fluid pressure generated by the fluid flowing through the valve cavity 12 on the first side of the valve core 12 is greater than the preset thrust, the valve core 12 can move towards the second side of the valve body 11 to increase the opening degree. That is, the opening and closing position of the valve core 12 can be dynamically adjusted according to the fluid pressure flowing into the valve cavity 12, so that the opening degree of the valve core 12 of the pressure regulating valve 10 matches the slurry flow rate and pressure, thereby enabling dynamic and precise adjustment of the resistance of the filling pipeline 50 and ensuring that the slurry is in a full-pipe flow state during transportation in the filling pipeline 50.

[0053] S4. Inject a second fluid into the filling pipeline 50 to isolate the injected first fluid, and then inject slurry into the filling pipeline 50 to fill the target area 60.

[0054] In this embodiment, injecting a second fluid into the filling pipeline 50 can isolate the slurry from the first fluid. When injecting the second fluid into the filling pipeline 50, the first fluid can be discharged to a preset position so as not to affect the filling effect of the target area 60. The second fluid can be any fluid. Preferably, the second fluid in this embodiment is mortar, which is a mixed fine-particle slurry with a concentration of 50% - 70% made from fly ash and cement.

[0055] After injecting the second fluid, i.e., mortar, into the filling pipeline 50 to isolate the first fluid, i.e., water, then the slurry in the hopper 20 can be injected into the filling pipeline 50 through the filling pump 30 to fill the target area 60. The slurry can be a paste slurry made from gangue, fly ash, desulfurized ash, portland cement, etc.

[0056] S5. Inject a third fluid into the filling pipeline 50 to isolate the injected slurry, and then inject a fourth fluid into the filling pipeline 50 to clean the filling pipeline 50, ending the filling operation.

[0057] In this embodiment, injecting a third fluid into the filling pipeline 50 can isolate the fourth fluid used for cleaning from the slurry. The third fluid can be any fluid. Preferably, the third fluid in this embodiment is the same as the second fluid, that is, the third fluid also selects mortar. The fourth fluid used for cleaning the filling pipeline 50 can also be any fluid. Preferably, the fourth fluid in this embodiment is the same as the first fluid, that is, the fourth fluid is also water, so as to reduce the operation cost.

[0058] The method for preventing and controlling non-full pipe flow provided by the embodiment of the present application is applied to a slurry filling system. The slurry filling system includes a hopper 20, a filling pump 30, and a filling pipeline 50. The filling pump 30 is used to convey the slurry in the hopper 20 to a target area 60 through the filling pipeline 50. The filling pipeline 50 is configured with a pressure regulating valve 10. The configured pressure regulating valve 10 includes: a valve body 11, a valve core 12, and a thrust device 13; the valve body 11 is provided with a valve cavity 12, a feed inlet 111, and a discharge outlet 112; the valve core 12 is located in the valve cavity 12 of the valve body 11, and the fluid flowing through the valve cavity 12 can generate a fluid pressure on the valve core 12; the thrust device 13 is connected to the valve body 11 and can apply a preset thrust to the valve core 12; wherein, under the action of the preset thrust and the fluid pressure, the valve core 12 can move relative to the valve body 11 to regulate the fluid flowing through the valve cavity 12, and the preset thrust is configured to enable the filling pipeline 50 to perform full pipe flow transportation; if the fluid pressure is less than the preset thrust, the valve core 12 moves towards the first side of the valve body 11, so that the flow area of the fluid flowing from the feed inlet 111 to the discharge outlet 112 becomes smaller; if the fluid pressure is greater than the preset thrust, the valve core 12 moves towards the second side of the valve body 11, so that the flow area of the fluid flowing from the feed inlet 111 to the discharge outlet 112 becomes larger. In this way, after installing the pressure regulating valve 10 on the filling pipeline 50 of the slurry filling system and setting a preset thrust for the pressure regulating valve 10 so that the fluid pressure generated by the slurry flowing from the feed inlet 111 to the discharge outlet 112 on the valve core 12 is balanced with the preset thrust, and the filling pipeline 50 can perform full pipe flow transportation, if the fluid pressure generated by the slurry flowing from the feed inlet 111 to the discharge outlet 112 on the valve core 12 changes, the opening and closing position of the valve core 12 can be dynamically adjusted according to the change in the fluid pressure of the slurry flowing into the valve cavity, so that the flow rate or resistance of the slurry flowing into the valve cavity can be dynamically adjusted, thereby realizing the full pipe flow transportation of the filling pipeline 50; in addition, the pressure regulating valve 10 is convenient for installation and layout at the filling construction site, which is beneficial to reducing the filling cost and operation intensity.

[0059] Optionally, in an embodiment of the present application, as Figure 4 shown, in step S4 of injecting slurry into the filling pipeline 50, the method further includes: observing the air release valve 40, and if gas emerges from the air release valve 40, increasing the preset thrust of the thrust device 13 to enable the filling pipeline 50 to perform full pipe flow transportation.

[0060] If gas emerges from the air release valve 40, it indicates that the filling pipeline 50 may have a non-full pipe flow situation, and the fluid pressure of the slurry conveyed by the filling pipeline 50 decreases. At this time, the preset thrust of the thrust device 13 can be slightly increased to reduce the opening degree of the valve core 12 and increase the resistance of the pressure regulating valve 10 to the slurry, so that the filling pipeline 50 resumes the full pipe flow transportation state.

[0061] Optionally, in one embodiment of the present application, after injecting the first fluid into the filling pipe 50 to the top of the vertical pipeline section of the filling pipe 50, the method also includes: obtaining a pressure measurement value of the first fluid flowing into the feed port 111 of the pressure regulating valve 10, and setting the thrust device 13 of the pressure regulating valve 10 according to the pressure measurement value of the first fluid, so that the thrust device 13 can apply a preset thrust to the valve core 12; wherein the preset thrust is configured to enable the filling pipe 50 to be fully piped; if the fluid pressure generated by the slurry flowing through the valve cavity on the valve core 12 is less than the preset thrust, the valve core 12 moves toward the first side of the valve body 11, so that the flow area of ​​the slurry flowing from the feed port 111 to the discharge port 112 becomes smaller; if the fluid pressure generated by the slurry flowing through the valve cavity on the valve core 12 is greater than the preset thrust, the valve core 12 moves toward the second side of the valve body 11, so that the flow area of ​​the slurry flowing from the feed port 111 to the discharge port 112 becomes larger.

[0062] In this embodiment, the thrust device 13 of the pressure regulating valve 10 is set according to the pressure measurement value of the first fluid. Based on the actual construction conditions on site, the preset thrust can be more accurately adapted to the fluid pressure of the slurry transported by the filling pipe 50 during the filling operation. The opening of the valve core 12 of the pressure regulating valve 10 can react and match the slurry flow and pressure changes more accurately and sensitively, thereby being able to more accurately adjust the resistance of the filling pipe 50 to ensure that the slurry is in a full pipe flow transportation state in the filling pipe 50.

[0063] For example, the thrust device 13 of the present embodiment may be a hydraulic cylinder. After the first fluid is injected into the filling pipe 50 to the top of the vertical pipe section of the filling pipe 50, the first pressure detection member 14 disposed near the feed port 111 of the valve body 11 of the pressure regulating valve 10 may measure the pressure measurement value of the first fluid, such as water, flowing in from the feed port 111 as the initial equilibrium pressure value P 0 According to the initial equilibrium pressure value P 0 , set the pressure threshold P of the thrust device 13, i.e. the hydraulic cylinder 1 , so that the hydraulic oil pressure in the hydraulic cylinder is maintained at the pressure threshold P 1 , if the pressure threshold P is exceeded 1 , the pressure is reduced by overflowing through the overflow valve 136, so that the piston rod 132 of the hydraulic cylinder can generate a stable preset thrust on the valve core 12 of the pressure regulating valve 10. 0 and pressure threshold P 1 Under the working condition, the fluid pressure on the first side of the valve core 12 is balanced and matched with the preset thrust on the second side of the valve core 12. The valve core 12 has a preset opening, which allows the filling pipeline 50 to work normally and transport the slurry steadily and fully.

[0064] During the process of injecting the slurry into the filling pipeline 50 for filling, the first pressure detection component 14 provided at the position of the valve body 11 of the pressure regulating valve 10 near the feed port 111 can measure the pressure measurement value P of the slurry flowing in from the feed port 111. The slurry flowing in from the feed port 111 generates fluid pressure on the first side of the valve core 12. Also, since the hydraulic oil pressure in the hydraulic cylinder is set at the pressure threshold P 1 , therefore, the piston 133 of the hydraulic cylinder is subjected to hydraulic force so that the piston rod 132 can generate a preset thrust on the second side of the valve core 12. In this way, if the pressure measurement value P of the slurry measured by the first pressure detection component 14 is less than the initial balance pressure value P 0 , the fluid pressure generated by the slurry flowing in from the feed port 111 on the first side of the valve core 12 is less than the hydraulic force exerted on the piston 133 by the hydraulic cylinder under the pressure threshold P 1 setting, that is, the fluid pressure received by the valve core 12 is less than the preset thrust, then the piston rod 132 extends outwards and pushes the valve core 12 to move towards the first side of the valve body 11, so that the opening degree of the valve core 12 becomes smaller, increasing the local resistance; if the pressure measurement value P of the slurry measured by the first pressure detection component 14 is greater than the initial balance pressure value P 0 , the fluid pressure generated by the slurry flowing in from the feed port 111 on the first side of the valve core 12 is greater than the hydraulic force exerted on the piston 133 by the hydraulic cylinder under the pressure threshold P 1 setting, that is, the fluid pressure received by the valve core 12 is greater than the preset thrust, then the piston rod 132 contracts and drives the valve core 12 to move towards the second side of the valve body 11, so that the opening degree of the valve core 12 becomes larger, reducing the local resistance, so that the opening degree of the valve core 12 of the pressure regulating valve 10 always matches the slurry flow rate and pressure, ensuring that the filling pipeline 50 is in a full pipe flow conveying state. In this embodiment, the balance pressure value P 0 , the pressure threshold P 1 , the pressure measurement value of the first fluid, and the pressure measurement value P of the slurry can be characterized by pressure as a physical quantity, or can also be characterized by pressure as a physical quantity.

[0065] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that they are connected to each other and the relative position relationship after connection remains unchanged. The orientation terms mentioned in the embodiments of the present application, for example, "upper", "lower", "inner", "outer", etc., are only with reference to the direction of the accompanying drawings. Therefore, the orientation terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application. "Plurality" means at least two.

[0066] In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of such features.

[0067] In the embodiments of the present application, "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0068] Reference to "one embodiment" or "some embodiments" etc. described in this specification means that in one or more embodiments of the present application, specific features, structures, or characteristics described in connection with that embodiment are included. Thus, statements such as "in one embodiment", "in some embodiments", "in some other embodiments", "in another embodiment", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in another way.

[0069] The above has described in detail the embodiments of the present application. Those skilled in the art can design and modify the device and its usage method within the scope of the present application according to the on-site construction situation.

[0070] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0071] The above is only the specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A pressure regulating valve, applied to a slurry filling system, the slurry filling system comprising a hopper, a filling pump, and a filling pipeline, the filling pump is used to transport the slurry in the hopper to a target area through the filling pipeline, the filling pipeline is provided with the pressure regulating valve, characterized in that: The pressure regulating valve comprises: A valve body, wherein the valve body is provided with a valve cavity, an inlet and an outlet; A valve core, the valve core is located in the valve cavity of the valve body, and the fluid flowing through the valve cavity can generate fluid pressure on the valve core; A thrust device, the thrust device is connected to the valve body and can apply a preset thrust to the valve core; Wherein, the valve core can move relative to the valve body under the action of the preset thrust and the fluid pressure to regulate the fluid flowing through the valve cavity; The preset thrust is configured to enable the filling pipe to deliver full pipe flow; If the fluid pressure is less than the preset thrust, the valve core moves toward the first side of the valve body, so that the flow area of ​​the fluid flowing from the feed inlet to the discharge outlet becomes smaller; If the fluid pressure is greater than the preset thrust, the valve core moves toward the second side of the valve body, so that the flow area of ​​the fluid flowing from the feed port to the discharge port becomes larger.

2. The pressure regulating valve according to claim 1, characterized in that: The thrust device is a hydraulic cylinder, which includes a cylinder body and a piston rod passing through the cylinder body; the first end of the piston rod is located in the cylinder body and is provided with a piston, and the second end of the piston rod extends into the valve body and is connected to the valve core; the hydraulic cylinder is provided with an oil inlet and an oil outlet, and the oil outlet is provided with a relief valve.

3. The pressure regulating valve according to claim 2, characterized in that: The valve body is provided with a guide hole, a guide cylinder is passed through the guide hole, the piston rod passes through the guide cylinder, and the second end of the piston rod extends into the valve body.

4. The pressure regulating valve according to claim 2, characterized in that: The valve body is provided with a first pressure detection member for detecting the pressure of the fluid flowing in from the feed port; and / or the hydraulic cylinder is provided with a second pressure detection member for detecting the pressure of the hydraulic oil in the hydraulic cylinder.

5. The pressure regulating valve according to claim 4, characterized in that: It also includes a pressure regulating device, which is communicatively connected with the first pressure detecting component and / or the second pressure detecting component to adjust the oil supply to the hydraulic cylinder and / or the overflow valve according to the measurement value of the first pressure detecting component and / or the measurement value of the second pressure detecting component, so that the hydraulic oil pressure in the hydraulic cylinder is adjusted to enable the filling pipeline to deliver full flow.

6. The pressure regulating valve according to claim 1, characterized in that: The valve core is provided with a flow guiding structure; The flow guiding structure smoothly transitions from the feed inlet to the discharge outlet; and / or The flow guiding structure is arc-shaped; and / or The flow guiding structure is made of wear-resistant and corrosion-resistant material; and / or The flow-guiding structure is provided with a silicon carbide coating.

7. The pressure regulating valve according to claim 1, characterized in that: The valve core moves relative to the valve body, and the flow area of ​​the fluid flowing from the feed inlet to the discharge outlet changes gradually; and / or The valve core has at least a first position and a second position. When the valve core is in the first position, the fluid flowing from the feed port to the discharge port has a first flow area. When the valve core is in the second position, the fluid flowing from the feed port to the discharge port has a second flow area, wherein the first flow area is smaller than the second flow area.

8. A method for preventing and controlling insufficient pipe flow, characterized in that: include: Close the pressure regulating valve of the filling pipeline located downhole, and open the air release valve of the filling pipeline located above the well, wherein the pressure regulating valve is the pressure regulating valve according to any one of claims 1 to 7; Injecting a first fluid into the filling pipeline to the top of the vertical pipe section of the filling pipeline to discharge gas in the filling pipeline; A thrust device of the pressure regulating valve is provided so that the thrust device can apply a preset thrust to the valve core; injecting a second fluid into the filling pipe to isolate the injected first fluid, and then injecting slurry into the filling pipe to fill the target area; A third fluid is injected into the filling pipeline to isolate the injected slurry, and then a fourth fluid is injected into the filling pipeline to clean the filling pipeline, thereby completing the filling operation.

9. The method for preventing and controlling incomplete pipe flow according to claim 8, characterized in that: In the step of injecting slurry into the filling pipeline, the method further includes: observing the air release valve, and if gas comes out of the air release valve, increasing the preset thrust of the thrust device to enable the filling pipeline to be fully flowed.

10. The method for preventing and controlling incomplete pipe flow according to claim 8, characterized in that: After injecting the first fluid into the filling pipe to the top of the vertical pipe section of the filling pipe, the method further includes: Obtaining a pressure measurement value of a first fluid flowing into a feed port of the pressure regulating valve, and setting a thrust device of the pressure regulating valve according to the pressure measurement value of the first fluid, so that the thrust device can apply a preset thrust to the valve core; Wherein, the preset thrust is configured to enable the filling pipeline to be fully flowed; If the fluid pressure exerted on the valve core by the slurry flowing through the valve cavity is less than the preset thrust, the valve core moves toward the first side of the valve body, so that the flow area of ​​the slurry flowing from the feed inlet to the discharge outlet becomes smaller; If the fluid pressure generated by the slurry flowing through the valve cavity on the valve core is greater than the preset thrust, the valve core moves toward the second side of the valve body to increase the flow area of ​​the slurry flowing from the feed port to the discharge port.

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