Branch closed-loop flow control steel pipe quenching jet flow external spraying device and branch closed-loop flow control steel pipe quenching jet flow external spraying method

Abstract

The invention discloses a shunt closed-loop flow control type steel pipe quenching jet external spraying device and method, and relates to the technical field of steel pipe heat treatment equipment. The device comprises a water supply main pipeline and a plurality of groups of secondary branch pipelines connected in parallel, a jet flow unit is arranged at the terminal of each group of branch pipelines, and each group of branch pipelines is independently provided with a closed-loop flow automatic control system. The jet flow unit comprises a main water tank, an auxiliary water tank, a flow guide water tank and a direct flow nozzle, and high-pressure and high-speed jet flow (the highest pressure is 0.8 MPa, and the speed is 8-15 m / s) is formed. The closed-loop system is composed of an electromagnetic flowmeter, an electric V-shaped ball valve and an intelligent electric control system, and accurate flow adjustment is achieved. Through branch independent control and high-pressure jet flow, a steam film is effectively broken, the cooling uniformity and speed are improved, and the straightness, ovality and process performance of the steel pipe are remarkably improved.

Description

Technical Field

[0001] This invention relates to the technical field of steel pipe heat treatment equipment, and in particular to a steel pipe quenching jet external spraying device and method with branched closed-loop flow control. Background Technology

[0002] Steel pipes, as a crucial industrial material, are widely used in fields such as oil and gas, and machinery manufacturing. Traditional steel pipe quenching devices employ multiple rows of U-shaped spray pipes, which suffer from uneven flow rates and slow cooling speeds, resulting in uneven steel pipe microstructure and poor straightness and ovality. While existing technologies involve flow control or high-pressure jetting, they fail to achieve independent closed-loop control for each channel and integration with the jetting unit, thus failing to simultaneously address the issues of uniformity and cooling speed. Therefore, this field requires a novel external spraying device to achieve efficient and uniform quenching cooling. Summary of the Invention

[0003] The purpose of this invention is to provide a steel pipe quenching jet external spraying device and method with branched closed-loop flow control, which aims to solve the technical problems of uneven cooling and insufficient vapor film destruction in the prior art.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a steel pipe quenching jet external spraying device with branch-loop flow control, comprising a main water supply pipeline and multiple sets of secondary branch pipelines all connected to the main water supply pipeline. A fully automatic cleaning mesh filter is installed at the inlet of the main water supply pipeline to filter quenching water; The number of secondary branch pipelines is configured according to the length of the steel pipe and the length of the steel wire. Each set of secondary branch pipelines is equipped with a jet unit at its end. The jet unit includes a main water tank, an auxiliary water tank, a guide water tank and a DC nozzle connected in sequence. The outlet of the guide water tank is threadedly connected to the DC nozzle. Each of the secondary branch pipelines is independently equipped with a closed-loop automatic flow control system. The closed-loop automatic flow control system includes an electromagnetic flow meter and an electric V-ball valve arranged sequentially along the water flow direction. The electromagnetic flow meter and the electric V-ball valve are electrically connected to an intelligent electronic control system. The intelligent electronic control system is configured to adjust the opening of the electric V-ball valve according to the feedback signal of the electromagnetic flow meter to maintain the flow set value.

[0005] In some embodiments: the fully automatic cleaning mesh filter includes an independent control system, which is equipped with a remote / local switching knob, a drain valve control knob, a cleaning brush control knob, and a local automatic cleaning button, and supports differential pressure control and time control cleaning modes; the outlet and inlet of the fully automatic cleaning mesh filter are respectively equipped with a first manual butterfly valve and a second manual butterfly valve.

[0006] In some embodiments: the closed-loop automatic flow control system further includes a pressure sensor and a temperature sensor, which are located near the jet unit and are electrically connected to the intelligent electronic control system.

[0007] In some embodiments: in the jet unit, the main water tank and the auxiliary water tank are connected by a second flexible connection, the auxiliary water tank is fixedly connected to the guide water tank, and the guide water tank is provided with a guide column with a length of 80-120mm inside for rectifying the water flow.

[0008] In some embodiments: the DC nozzle has a converging flow channel design with an outlet diameter of Φ8-Φ15mm, and the water flow pressure ejected through the DC nozzle is 0.3-0.8MPa, and the water flow velocity is 8-15m / s.

[0009] In some implementations: on each of the secondary branch pipes, before the closed-loop automatic flow control system, a third manual butterfly valve, a Y-type filter and a first flexible joint are sequentially arranged along the water flow direction, and the secondary branch pipes are fixed to the external shower frame by pipe clamps.

[0010] In some implementations: the intelligent electronic control system employs a PID control algorithm to dynamically adjust the opening of the electric V-ball valve based on feedback data from the electromagnetic flowmeter, pressure sensor, and temperature sensor, in order to maintain the flow setpoint.

[0011] This invention also provides a method for a steel pipe quenching jet external spraying device using the above-described branched closed-loop flow control, comprising the following steps: The quenching water in the main water supply line is filtered by a fully automatic cleaning mesh filter. Quenching water is distributed to the jet unit through secondary branch pipelines, forming a high-pressure, high-speed jet that impacts the outer surface of the steel pipe. The flow rate of each secondary branch pipeline is monitored and adjusted in real time by a closed-loop automatic flow control system to ensure uniform cooling along the steel pipe axis. The intelligent electronic control system integrates pressure and temperature data to optimize jet parameters.

[0012] In some embodiments: the high-pressure, high-speed jet has a water flow pressure of 0.5-0.8 MPa and a water flow velocity of 10-15 m / s, and is used to break the steam film on the surface of the steel pipe.

[0013] In some implementations, the number of secondary branch pipelines and the closed-loop flow rate setting are dynamically adjusted according to the steel pipe wall thickness and length to achieve uniform quenching structure.

[0014] Compared with the prior art, the steel pipe quenching jet external spraying device and method with branched closed-loop flow control of the present invention has at least the following beneficial effects: Improved quenching uniformity: Independent closed-loop control ensures uniform cooling along the entire length of the steel pipe, improving straightness and ovality.

[0015] Increased cooling rate: High-pressure, high-speed jets rapidly break the vapor film, achieving nucleus boiling cooling.

[0016] Intelligent control: PID algorithm and sensor integration optimize parameters to adapt to different steel pipe specifications.

[0017] Enhanced reliability: Fully automated filtration and redundant design reduce the risk of clogging.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the steel pipe quenching jet external spraying device with branched closed-loop flow control according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the steel pipe quenching jet external spraying device with branched closed-loop flow control according to another perspective of an embodiment of the present invention. Figure 3 This is a schematic diagram of the DC nozzle arrangement of the steel pipe quenching jet external spraying device with branched closed-loop flow control according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Main water supply line; 2. Third manual butterfly valve; 3. Secondary branch line; 4. Y-type filter; 5. First flexible joint; 6. Electromagnetic flow meter; 7. Electric V-type ball valve; 8. Main water tank; 9. Second flexible joint; 10. Auxiliary water tank; 11. Diversion water tank; 12. DC nozzle; 13. Pressure sensor; 14. Temperature sensor; 15. Fully automatic cleaning mesh filter; 16. Second manual butterfly valve; 17. First manual butterfly valve. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0023] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] like Figures 1-3 As shown, this embodiment of the invention provides a steel pipe quenching jet external spraying device with branch closed-loop flow control, including a main water supply pipeline 1 and multiple sets of secondary branch pipelines 3 connected to the main water supply pipeline 1. A fully automatic cleaning mesh filter 15 is installed at the inlet of the main water supply pipeline 1 to filter quenching water; The number of secondary branch pipelines is configured according to the length of the steel pipe and the length of the steel wire. Each set of secondary branch pipelines 3 is equipped with a jet unit at its end. The jet unit includes a main water tank 8, an auxiliary water tank 10, a guide water tank 11 and a DC nozzle 12 connected in sequence. The outlet of the guide water tank 11 is threadedly connected to the DC nozzle 12. Each of the secondary branch pipelines 3 is independently equipped with a closed-loop automatic flow control system. The closed-loop automatic flow control system includes an electromagnetic flow meter 6 and an electric V-type ball valve 7 arranged sequentially along the water flow direction. The electromagnetic flow meter 6 and the electric V-type ball valve 7 are electrically connected to an intelligent electronic control system. The intelligent electronic control system is configured to adjust the opening of the electric V-type ball valve 7 according to the feedback signal of the electromagnetic flow meter 6 to maintain the flow set value.

[0026] In this embodiment, quenching water is supplied to the main water supply line 1 by an external high-lift water supply system. It first flows through the fully automatic cleaning mesh filter 15 at the inlet of the main water supply line 1. This filter efficiently filters impurities in the water, preventing clogging of the subsequent DC nozzle 12 and wear on precision components such as the electric V-type ball valve 7. The filtered quenching water is then evenly distributed along the main water supply line 1 to multiple sets of secondary branch pipes 3. The number of secondary branch pipes 3 is flexibly configured to 5-7 sets based on the length of the steel pipe to be quenched (e.g., 10.5m, 12m, 14.5m) and the length of the steel line, ensuring complete coverage of the entire axial length of the steel pipe. The water flow in each set of secondary branch pipes 3 is ultimately delivered to the terminal jet unit, passing sequentially through the main water tank 8, the auxiliary water tank 10, and the guide water tank 11. The main water tank 8 and the auxiliary water tank 10 buffer and stabilize the water flow, eliminating water flow fluctuations. The guide water tank 11 rectifies the water flow, eliminating eddies to form a stable flow pattern. Finally, the water flow is ejected through the DC nozzle 12, which is threadedly connected to the outlet of the guide water tank 11, forming a high-pressure, high-speed jet. Simultaneously, the closed-loop automatic flow control system on each set of secondary branch pipes 3 works synchronously. The electromagnetic flowmeter 6 collects the flow data in the pipe in real time and transmits it to the intelligent electronic control system. The intelligent electronic control system compares the actual flow with the preset cooling demand flow. If there is a deviation, it sends a control signal to the electric V-type ball valve 7, which precisely corrects the flow by adjusting the valve opening. During this process, independent flow control of each branch can effectively offset the impact of water pressure fluctuations, ensuring uniform cooling in all areas of the steel pipe along the axis; high-pressure, high-speed jet (up to 0.8MPa, flow rate 8-15m / s) can quickly break the vapor film on the surface of the steel pipe, avoiding the vapor film from hindering heat exchange, realizing nucleation boiling cooling, significantly improving the cooling rate, and ultimately improving the straightness (e.g. ≤1.2mm / 1.5m), ellipticity (e.g. ≤0.55%D), martensite content (e.g. ≥95%), and overall process performance of the quenched steel pipe.

[0027] In some embodiments: the fully automatic cleaning mesh filter 15 includes an independent control system, which is equipped with a remote / local switching knob, a drain valve control knob, a cleaning brush control knob and a local automatic cleaning button, and supports differential pressure control and time control cleaning modes; the outlet and inlet of the fully automatic cleaning mesh filter 15 are respectively provided with a first manual butterfly valve 17 and a second manual butterfly valve 16.

[0028] In this embodiment, the fully automatic cleaning screen filter 15 is equipped with an independent control system. The system's field terminal box is equipped with a remote / local switching knob, a drain valve opening / closing control knob, a cleaning brush rotation / stop control knob, and a local automatic cleaning button. Remote centralized control or local control can be selected according to actual operational needs. The cleaning process supports both differential pressure control and time control: when the pressure difference between the filter inlet and outlet reaches a set threshold (due to increased water flow resistance caused by impurity accumulation), or when the running time reaches a preset cycle, the control system automatically starts the cleaning program, driving the cleaning brush to rotate and clean the impurities on the filter screen, while simultaneously opening the drain valve to discharge the impurities; cleaning can also be manually started by pressing the local automatic cleaning button. Furthermore, the fully automatic cleaning screen filter 15 is equipped with a first manual butterfly valve 17 and a second manual butterfly valve 16 at the outlet and inlet, respectively. During normal operation, both valves remain fully open to ensure smooth water flow. When the filter needs maintenance (such as replacing the filter screen), closing the second manual butterfly valve 16 cuts off the local water supply without stopping the entire water supply system, significantly reducing equipment downtime. This design can continuously and stably filter quenching water, preventing impurities from affecting system operation. It is also flexible in operation and convenient in maintenance, ensuring the continuity and cleanliness of the water supply for the entire quenching device.

[0029] In some embodiments: the closed-loop automatic flow control system further includes a pressure sensor 13 and a temperature sensor 14, which are disposed near the jet unit and are electrically connected to the intelligent electronic control system.

[0030] In this embodiment, when the closed-loop automatic flow control system is working, the electromagnetic flowmeter 6 monitors the water flow rate in the secondary branch pipe 3 in real time and transmits the data to the intelligent electronic control system; the pressure sensor 13, located near the jet unit, can collect water pressure data in real time and feed it back to the electronic control system to determine whether the water pressure is stable; the temperature sensor 14, located near the jet unit, can collect water temperature data in real time and feed it back to the electronic control system to determine whether the external spray water temperature meets the standard. The data from these three sources serve as the basis for the electronic control system's adjustment. After receiving the data, the intelligent electronic control system comprehensively analyzes the reasons for the flow deviation: if the flow rate decreases due to a drop in water pressure, the system calculates the required valve opening increment and controls the electric V-type ball valve 7 to increase its opening to compensate for the flow; if the temperature rises, indicating insufficient cooling intensity, the system further increases the flow rate setpoint and ensures the cooling effect by adjusting the valve. This multi-parameter coordinated control method avoids the limitations of single flow monitoring and can more accurately maintain the flow stability of each secondary branch pipeline 3. It is especially suitable for the stringent requirements of cooling uniformity during the quenching of thick-walled steel pipes (such as 60mm thick wall), reducing problems such as uneven steel pipe structure and hardness deviation (such as ≥3HRC) caused by parameter fluctuations.

[0031] In some embodiments: In the jet unit, the main water tank 8 and the auxiliary water tank 10 are connected by a second flexible joint 9. The auxiliary water tank 10 is fixedly connected to the guide water tank 11. The guide water tank 11 is provided with a guide column with a length of 80-120mm inside for rectifying the water flow.

[0032] In this embodiment, when the jet unit is working, the water flow enters the main water tank 8 and is then transported to the auxiliary water tank 10 through the second flexible joint 9. The second flexible joint 9 can effectively absorb the vibration generated during the operation of the secondary branch pipeline 3, as well as the displacement caused by thermal expansion and contraction of the pipeline due to changes in water temperature, thus preventing stress damage to the main water tank 8 and the auxiliary water tank 10 due to rigid connection. After further pressure stabilization in the auxiliary water tank 10, the water flows into the guide water tank 11, which is fixedly connected to the auxiliary water tank 10. The guide water tank 11 is equipped with guide columns with a length of 80-120mm. The guide columns can straighten the direction of the water flow, eliminate eddies and turbulent flow patterns in the water flow, and make the water flow form a uniform and stable rectified state. The rectified water flow is finally ejected through the DC nozzle 12, forming a concentrated and precisely directional jet. In this structure, the second flexible joint 9 improves the vibration resistance and adaptability of the jet unit and extends the service life of the equipment; the guide column of the guide water tank 11 optimizes the water flow state, avoids jet divergence, and ensures that the water jet sprayed by the DC nozzle 12 can accurately impact the designated area on the surface of the steel pipe, further improving the cooling uniformity, especially significantly improving the cooling consistency in the circumferential direction of the steel pipe.

[0033] In some embodiments: the DC nozzle 12 is a converging flow channel design with an outlet diameter of Φ8-Φ15mm, and the water flow pressure ejected through the DC nozzle 12 is 0.3-0.8MPa, and the water flow velocity is 8-15m / s.

[0034] In this embodiment, the water flow is rectified by the guide tank 11 and then enters the DC nozzle 12. The DC nozzle 12 adopts a contraction channel design, in which the water flow is gradually compressed, and the pressure and flow velocity are increased simultaneously. Combined with the pressure regulation of the upstream secondary branch pipe 3, when the water flow passes through the DC nozzle 12 with an outlet diameter of Φ8-Φ15mm, the pressure can be stabilized at 0.3-0.8MPa and the flow velocity reaches 8-15m / s. For steel pipes of different specifications, the DC nozzle 12 with the corresponding outlet diameter can be selected: when processing oil casing with an outer diameter of Φ340mm and a wall thickness of 45mm, a nozzle with an outlet diameter of Φ10mm is selected to maintain the jet pressure at 0.5MPa and the flow velocity at 12m / s; when processing ultra-thick wall pipes with an outer diameter of Φ406mm and a wall thickness of 60mm, a nozzle with an outlet diameter of Φ12mm is selected to increase the jet pressure to 0.8MPa and the flow velocity to 15m / s. When high-pressure, high-speed water flows impact the outer surface of a high-temperature steel pipe, its kinetic energy is sufficient to instantly break the vapor film formed on the surface of the steel pipe and quickly carry away the broken vapor, allowing the cooling water to directly contact the surface of the steel pipe, achieving efficient nucleus boiling cooling, significantly improving heat exchange efficiency, shortening quenching time, and avoiding insufficient local cooling caused by the vapor film, thus ensuring synchronous cooling of the inner and outer surfaces of the steel pipe.

[0035] In some implementations: on each set of secondary branch pipes 3, before the closed-loop automatic flow control system, a third manual butterfly valve 2, a Y-type filter 4 and a first flexible joint 5 are sequentially arranged along the water flow direction, and the secondary branch pipes 3 are fixed to the external shower frame by pipe clamps.

[0036] In this embodiment, after the quenching water enters the secondary branch pipe 3, it first flows through the third manual butterfly valve 2. During normal quenching operations, the third manual butterfly valve 2 remains fully open to ensure smooth water flow. When this group of secondary branch pipes 3 needs maintenance (such as replacing the filter element of the Y-type filter 4 or maintaining the electromagnetic flowmeter 6), closing the third manual butterfly valve 2 will cut off the water flow in this branch without affecting the normal operation of other secondary branch pipes 3. Subsequently, the water flows into the Y-type filter 4, which further filters out fine impurities remaining in the water, preventing impurities from entering the subsequent electromagnetic flowmeter 6 and electric V-type ball valve 7, and avoiding blockage or wear of precision components. The filtered water flows through the first flexible joint 5, which absorbs the displacement caused by vibration or temperature changes in the secondary branch pipe 3, reducing the impact on the downstream closed-loop flow automatic control system components and protecting the measurement accuracy and control stability of the electromagnetic flowmeter 6 and electric V-type ball valve 7. Meanwhile, the secondary branch pipe 3 is fixed to the external spraying machine frame by pipe clamps to ensure that the pipe position is fixed and to avoid the pipe displacement caused by water flow impact. This ensures that the spray direction of the DC nozzle 12 is always accurately aligned with the surface of the steel pipe and that there will be no cooling blind zone due to pipe displacement.

[0037] In some implementations: the intelligent electronic control system employs a PID control algorithm to dynamically adjust the opening of the electric V-ball valve 7 based on feedback data from the electromagnetic flowmeter 6, pressure sensor 13, and temperature sensor 14, in order to maintain the flow setpoint.

[0038] In this embodiment, the intelligent electronic control system incorporates a PID control algorithm, enabling dynamic and precise adjustment of the flow rate. During operation, the electromagnetic flowmeter 6 continuously collects real-time flow data within the secondary branch pipe 3, the pressure sensor 13 collects water pressure data near the jet unit, and the temperature sensor 14 collects water temperature data near the jet unit. All three data points are transmitted to the intelligent electronic control system in real time. The PID control algorithm processes this data, first calculating the difference between the actual flow rate and the preset target flow rate, then determining whether the flow fluctuation is caused by water pressure fluctuations based on the water pressure change trend, and finally determining whether the current cooling intensity matches the steel pipe's requirements based on temperature data. Ultimately, it calculates the optimal opening adjustment value for the electric V-type ball valve 7. For example, if a sudden drop in water pressure causes the flow rate to deviate from the preset value by 5%, the PID algorithm can respond quickly, calculating within 0.5 seconds that the valve opening needs to be increased by 3%, and sending a control signal to the electric V-type ball valve 7 to rapidly restore the flow rate to the preset value. Even if a temperature increase occurs simultaneously, the algorithm can make comprehensive adjustments to ensure that the flow rate remains stable while meeting cooling requirements. This rapid and precise adjustment method can effectively resist various interferences in the water supply system, ensuring that the flow rate of each secondary branch pipe 3 remains stable within the set range, providing uniform cooling conditions for the steel pipe, and reducing problems such as excessive straightness and elliptical deformation of the steel pipe caused by flow fluctuations.

[0039] This invention also provides a method for a steel pipe quenching jet external spraying device using the above-described branched closed-loop flow control, comprising the following steps: The quenching water in the main water supply line 1 is filtered by a fully automatic cleaning mesh filter 15. Quenching water is distributed to the jet unit via secondary branch pipeline 3, forming a high-pressure, high-speed jet that impacts the outer surface of the steel pipe. The flow rate of each secondary branch pipe 3 is monitored and adjusted in real time by a closed-loop automatic flow control system to ensure uniform cooling along the steel pipe axis. The intelligent electronic control system integrates pressure and temperature data to optimize jet parameters.

[0040] In this embodiment, before the quenching operation is started, the fully automatic cleaning mesh filter 15 is turned on. After the filter enters a stable working state, the external water supply system supplies quenching water to the main water supply line 1. After being filtered by the fully automatic cleaning mesh filter 15, the water is distributed to each group of secondary branch lines 3 along the main water supply line 1. The water flow entering the secondary branch lines 3 first passes through the third manual butterfly valve 2, the Y-type filter 4, and the first flexible joint 5 to complete the secondary filtration of impurities and the buffering of pipeline vibration before entering the closed-loop automatic flow control system. Subsequently, the water flow continues to be supplied to the jet unit. After being buffered by the main water tank 8, stabilized by the auxiliary water tank 10, and rectified by the guide water tank 11, it forms a high-pressure, high-speed jet through the DC nozzle 12, which directly impacts the outer surface of the steel pipe to be quenched. During this process, the closed-loop automatic flow control system operates continuously: the electromagnetic flowmeter 6 monitors the flow rate in real time, and the pressure sensor 13 and temperature sensor 14 synchronously collect pressure and temperature data. All data is transmitted to the intelligent electronic control system. Based on this data, the intelligent electronic control system dynamically adjusts the opening of the electric V-type ball valve 7 using a PID algorithm to ensure that the flow rate of each secondary branch pipe 3 accurately matches the cooling requirements. Simultaneously, the electronic control system also integrates and analyzes the changing trends of various parameters. If it detects that the pressure of a certain jet unit is consistently low, it automatically fine-tunes the flow rate setpoint of the corresponding secondary branch pipe 3 to further optimize the jet parameters, ensuring uniform cooling of the steel pipe in both axial and circumferential directions. The entire process achieves full-process control from water inlet filtration to jet cooling, ensuring stable and reliable quenching quality.

[0041] In some embodiments: the high-pressure, high-speed jet has a water flow pressure of 0.5-0.8 MPa and a water flow velocity of 10-15 m / s, and is used to break the steam film on the surface of the steel pipe.

[0042] In this embodiment, for steel pipes requiring efficient cooling (especially thick-walled steel pipes with a wall thickness of 45mm or more), the jet unit optimizes the volume of the main water tank 8 and the auxiliary water tank 10, and the flow guiding structure of the guide water tank 11. Combined with the precise flow regulation of the electric V-type ball valve 7, the high-pressure, high-speed jet ejected from the DC nozzle 12 is stabilized at a pressure of 0.5-0.8MPa and a flow velocity of 10-15m / s. When the jet with these parameters impacts the outer surface of the high-temperature steel pipe, its high kinetic energy can instantly break the vapor film formed on the surface of the steel pipe due to the high temperature. This vapor film would hinder the direct contact between the cooling water and the surface of the steel pipe, resulting in a significant reduction in heat exchange efficiency. After the jet breaks the vapor film, the cooling water can directly contact the surface of the steel pipe and enter the nucleation boiling cooling stage. The heat exchange efficiency is 3-5 times higher than that of traditional low-pressure spraying, which can quickly remove the heat from the surface of the steel pipe, making the cooling rate of the outer surface of the steel pipe synchronized with the cooling rate of the inner surface. For example, when processing oil casing with an outer diameter of Φ340mm and a wall thickness of 45mm, the jet with these parameters can reduce the surface temperature of the steel pipe from 850℃ to below 300℃ within 20 seconds, effectively avoiding stress concentration in the internal structure of the steel pipe caused by asynchronous internal and external cooling, and improving the hardenability and uniformity of the steel pipe.

[0043] In some implementations: the number of secondary branch pipes 3 and the closed-loop flow rate setting are dynamically adjusted according to the steel pipe wall thickness and length to achieve uniform quenching structure.

[0044] In this embodiment, when processing steel pipes of different specifications, the number of secondary branch pipes 3 is first determined based on the wall thickness (e.g., 12mm, 45mm, 60mm) and length (e.g., 10.5m, 12m, 14.5m): For medium-thin-walled steel pipes with an outer diameter of Φ219mm, a wall thickness of 12mm, and a length of 10.5m, 5 sets of secondary branch pipes 3 are sufficient to achieve full-length coverage; for ultra-thick-walled steel pipes with an outer diameter of Φ406mm, a wall thickness of 60mm, and a length of 14.5m, 7 sets of secondary branch pipes 3 are required to ensure that there is an independent cooling branch approximately every 2m along the axial direction of the steel pipe, avoiding cooling blind spots. After determining the number of sets, the intelligent electronic control system sets the preset flow rate value for each set of secondary branch pipes 3 according to the steel pipe wall thickness: for thick-walled steel pipes requiring higher cooling speeds, the preset flow rate value is set to 800m³ / h; for medium-thin-walled steel pipes to avoid over-cooling leading to performance embrittlement, the preset flow rate value is set to 500m³ / h. During the quenching process, the closed-loop automatic flow control system strictly maintains the flow rate of each secondary branch pipe 3 within the preset value ±2%. If adjustments are needed due to local temperature changes in the steel pipe, the electrical control system can also fine-tune the flow rate setting to ensure that the cooling intensity of each area of ​​the steel pipe matches its wall thickness. This dynamic adjustment method allows the device to adapt to various steel pipes with outer diameters ranging from Φ219mm to Φ406mm and wall thicknesses from 12mm to 60mm, ensuring that each specification of steel pipe can obtain a uniform quenched microstructure (martensite content ≥90%), significantly expanding the applicability of the device and improving the quenching qualification rate of steel pipes of different specifications.

[0045] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A shunt closed-loop flow control steel pipe quenching jet external shower device, comprising a water supply main pipeline (1) and a plurality of groups of secondary branch pipelines (3) in communication with the water supply main pipeline (1), characterized in that: a set of full-automatic cleaning screen filter (15) is arranged at the inlet of the water supply main pipeline (1) for filtering quenching water; the number of the secondary branch pipelines (3) is configured according to the length of the steel pipe and the length of the steel line, and the terminal of each group of the secondary branch pipelines (3) is provided with a set of jet unit, the jet unit comprises a main water tank (8), a secondary water tank (10), a flow guide water tank (11) and a straight-flow nozzle (12) connected in sequence, wherein the outlet of the flow guide water tank (11) is threadedly connected with the straight-flow nozzle (12); a set of closed-loop flow automatic control system is independently arranged on each group of the secondary branch pipelines (3) along the water flow direction, the closed-loop flow automatic control system comprises an electromagnetic flowmeter (6) and an electric V-type ball valve (7) arranged in sequence along the water flow direction, and the electromagnetic flowmeter (6) and the electric V-type ball valve (7) are electrically connected with an intelligent electric control system, the intelligent electric control system is configured to adjust the opening degree of the electric V-type ball valve (7) according to the feedback signal of the electromagnetic flowmeter (6) to maintain the flow set value. The full-automatic cleaning screen filter (15) comprises an independent control system, the control system is provided with a remote / local switching knob, a blowdown valve control knob, a cleaning brush control knob and a local automatic cleaning button, and supports differential pressure control and time control cleaning mode; the outlet and the inlet of the full-automatic cleaning screen filter (15) are respectively provided with a first manual butterfly valve (17) and a second manual butterfly valve (16). The closed-loop flow automatic control system further comprises a pressure sensor (13) and a temperature sensor (14), the pressure sensor (13) and the temperature sensor (14) are arranged near the jet unit, and the pressure sensor (13) and the temperature sensor (14) are electrically connected with the intelligent electric control system. In the jet unit, the main water tank (8) and the secondary water tank (10) are connected through a second flexible joint (9), the secondary water tank (10) is fixedly connected with the flow guide water tank (11), and the flow guide water tank (11) is internally provided with a flow guide column with a length of 80-120 mm for rectifying water flow.

2. The shunt closed loop flow controlled, steel tube quenched, showering device of claim 1, wherein: The straight-flow nozzle (12) is designed in a convergent flow channel, the outlet diameter is Φ8-Φ15 mm, the water flow pressure through the straight-flow nozzle (12) is 0.3-0.8 MPa, and the water flow speed is 8-15 m / s.

3. The shunt closed loop flow controlled, steel tube quenched, showering device of claim 1, wherein: On each group of the secondary branch pipelines (3), a third manual butterfly valve (2), a Y-type filter (4) and a first flexible joint (5) are sequentially arranged along the water flow direction before the closed-loop flow automatic control system, and the secondary branch pipelines (3) are fixed on an external shower rack through pipe clamps.

4. The shunt closed loop flow controlled, steel tube quenched, showering device of claim 1, wherein: The intelligent electric control system adopts a PID control algorithm, dynamically adjusts the opening degree of the electric V-type ball valve (7) according to the feedback data of the electromagnetic flowmeter (6), the pressure sensor (13) and the temperature sensor (14) to maintain the flow set value.

5. The shunt closed loop flow controlled, steel tube quenched, showering device of claim 1, wherein: ​ 6. The shunt closed loop flow controlled, steel tube quenched, showering device of claim 1, wherein: ​ 7. The shunt closed loop flow controlled, steel tube quenched, showering device of claim 3, wherein: ​ 8. A method of using a quenching jet external shower device for steel pipes with shunt closed loop flow control according to any one of claims 1-7, characterized in that, The method comprises the following steps: quenching water in a main water supply pipeline (1) is filtered by a full-automatic cleaning screen filter (15); the quenching water is distributed to a jet unit through a secondary branch pipeline (3) to form a high-pressure high-speed jet to impact the outer surface of the steel pipe; the flow of each group of secondary branch pipelines (3) is monitored and adjusted in real time through a closed-loop flow automatic control system to ensure uniform cooling along the axial direction of the steel pipe; pressure and temperature data are integrated by an intelligent electric control system to optimize jet parameters.

9. The method of claim 8, wherein: The flow pressure of the high-pressure high-speed jet is 0.5-0.8 MPa, and the flow speed is 10-15 m / s, which is used to break the steam film on the surface of the steel pipe.

10. The method of claim 8, wherein: According to the wall thickness and length of the steel pipe, the number of groups of secondary branch pipelines (3) and the closed-loop flow setting value are dynamically adjusted to realize uniformity of quenching structure.

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