Versatile injection system for continuous injection

Abstract

The present invention provides a multifunctional injection system with sustainable liquid injection. The system includes an injection pump and two stirring assemblies connected by pipelines. The two stirring assemblies are symmetrically located on both sides of the injection pump and are connected to the injection pump through pipelines. The stirring assembly includes an injection valve, a vent valve, a stirring intermediate container whose top is connected to the injection valve and the vent valve through pipelines, a vacuum valve and an air pressure valve connected to the bottom of the stirring intermediate container through pipelines, and a liquid outlet valve and a liquid replenishing valve connected to the vacuum valve and the air pressure valve through pipelines. The injection valves at the top of each of the two stirring assemblies are connected by pipelines, and the liquid outlet valves at the bottom of each of the two stirring assemblies are connected by pipelines. A stirring outlet is provided between the two liquid outlet valves, and the injection pump is provided between the two injection valves. The present invention has the advantages of not needing to be shut down at night, thereby improving the work efficiency of the core displacement experiment. It has the function of uninterrupted injection without manual supervision and automatic metering of the injection volume, and has the advantages of saving manpower and being intelligent.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield chemical core physical simulation experiments, in particular to a multifunctional injection system capable of continuous liquid injection. Background Art

[0002] At present, the field of core physical simulation experiments for oilfield chemical enhanced oil recovery mainly uses injection pumps to provide power, drive piston-type intermediate containers and then provide displacement liquid. The piston intermediate containers can be made into various specifications such as 200ml, 500ml, and 1000ml. When conducting large-scale core physical simulation experiments for high permeability reservoirs, the amount of injected liquid is too large. The traditional physical simulation experiments use the following methods: (1) using large-capacity piston containers. The problem is that they are too heavy, which brings great trouble to the experimental operators. (2) shutting down the injection system, performing artificial fluid replenishment, and then conducting the injection experiment. This intermediate pump stop process is prone to cause bubbles to enter the displacement device, and after the injection pump restores pressure, the oil and water distribution in the core changes, etc., which will lead to inaccurate experimental results.

[0003] Traditional injection systems measure the amount of power fluid injected by the injection pump, equating it to the injection volume. This is not intuitive and is subject to the metering accuracy of the injection pump. Furthermore, the need to remove air and other gases from the pipeline leads to inaccurate metering. For heterogeneous systems such as polymer microspheres and flexible particles, using traditional intermediate containers, granular control agents tend to sink to the bottom due to gravity, causing significant trouble for experimental operators and leading to inaccurate experimental results. Experiments should utilize simultaneous injection and stirring. Furthermore, by controlling the stirring frequency, it is possible to study the impact of shear properties on injection, plugging, and control performance. Summary of the Invention

[0004] In order to solve the above problems, an embodiment of the present invention provides a multifunctional injection system capable of continuous liquid injection, the system comprising an injection pump and two stirring assemblies connected by pipelines, the two stirring assemblies being symmetrically located on both sides of the injection pump and connected to the injection pump by pipelines;

[0005] The stirring assembly includes a liquid injection valve, a vent valve, a stirring intermediate container with a top connected to the liquid injection valve and the vent valve through pipelines, a vacuum valve and an air pressure valve connected to the bottom of the stirring intermediate container through pipelines, and a liquid outlet valve and a liquid replenishing valve connected to the vacuum valve and the air pressure valve through pipelines;

[0006] The injection valves at the top of the two stirring components are connected by pipelines, and the liquid outlet valves at the bottom of the two stirring components are connected by pipelines. A stirring outlet is provided between the two liquid outlet valves, and the injection pump is provided between the two injection valves.

[0007] Optionally, in one embodiment of the present invention, the system further includes a software control module, which is electrically connected to the injection valve, vent valve, vacuum valve, air pressure valve, liquid outlet valve and liquid replenishing valve to control the opening and closing of the injection valve, vent valve, vacuum valve, air pressure valve, liquid outlet valve and liquid replenishing valve.

[0008] Optionally, in one embodiment of the present invention, the stirring intermediate container includes an upright cylindrical shell, a piston is provided inside the cylindrical shell, the cylindrical shell is divided into an upper cavity and a lower cavity independently of each other by the piston, an upper plug is provided at the upper end of the cylindrical shell, a displacement sensor is provided outside the cylindrical shell, the displacement sensor is connected to the piston in turn through an external connecting rod and a displacement rod, the displacement rod passes through the upper plug, a stirring paddle is provided in the lower cavity, a stirring motor is provided outside the lower end of the cylindrical shell, and the stirring paddle is connected to the stirring motor through a transmission mechanism.

[0009] Optionally, in one embodiment of the present invention, the stirring intermediate container further includes a control unit and a display unit, and the display unit and the displacement sensor are both connected to the control unit.

[0010] Optionally, in one embodiment of the present invention, the external connecting rod is in a horizontal state, the displacement rod is in an upright state, and the displacement sensor can measure the displacement of the piston through the external connecting rod and the displacement rod.

[0011] Optionally, in one embodiment of the present invention, a liquid injection port is provided on the upper plug, and liquid can enter the upper cavity of the cylindrical shell through the liquid injection port.

[0012] Optionally, in one embodiment of the present invention, a liquid outlet is provided at the lower portion of the cylindrical shell, and the liquid in the lower cavity of the cylindrical shell can be discharged through the liquid outlet, and the stirring paddle is located at the lower portion of the lower cavity.

[0013] Optionally, in one embodiment of the present invention, the stirring intermediate container further includes a chassis, the cylindrical shell and the chassis are arranged up and down, and the stirring motor is located inside the cylindrical shell.

[0014] Optionally, in one embodiment of the present invention, a cylindrical base is provided between the cylindrical shell and the chassis, and the lower end of the cylindrical shell is inserted into the upper end of the cylindrical base.

[0015] Optionally, in one embodiment of the present invention, the transmission mechanism includes an outer magnetic sleeve assembly and an inner magnetic sleeve assembly, and the stirring motor, the outer magnetic sleeve assembly, the inner magnetic sleeve assembly and the stirring paddle are connected in sequence.

[0016] Optionally, in one embodiment of the present invention, the outer magnetic sleeve assembly includes an outer magnet and an outer shell arranged inside and outside, the inner magnetic sleeve assembly includes an inner magnet, a stirring rod and an inner shell arranged in sequence from the inside to the outside, the stirring rod is connected to the stirring paddle, the inner shell is a cylindrical structure with one end closed and the other end open, the open end of the inner shell is sealed and fixedly connected to the cylindrical base, the inner shell is sleeved in the outer magnet, and the outer shell is connected to the output shaft of the stirring motor.

[0017] Optionally, in one embodiment of the present invention, the cylindrical shell is cylindrical, and the material of the cylindrical shell is 1Cr18Ni9Ti.

[0018] The present invention has the advantages of not needing to shut down the injection system at night and improving the working efficiency of the core displacement experiment. It can perform uninterrupted injection and automatically measure the injection volume without manual supervision, and has the advantages of saving manpower and being intelligent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of a multifunctional injection system for continuous liquid injection according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of a stirring intermediate container according to an embodiment of the present invention;

[0022] Figure 3 A cross-sectional view of an outer magnetic sleeve assembly of a stirring intermediate container according to an embodiment of the present invention;

[0023] Figure 4 A cross-sectional view of an inner magnetic sleeve assembly of a stirring intermediate container according to an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of a transmission mechanism for stirring an intermediate container according to an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the coordination between the outer magnet and the inner magnet for stirring the intermediate container in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] An embodiment of the present invention provides a multifunctional injection system capable of continuous liquid injection.

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] like Figure 1 The following is a schematic diagram of a multifunctional injection system for continuous injection according to an embodiment of the present invention. The system shown in the figure includes:

[0029] An injection pump and two stirring assemblies connected by pipelines, wherein the two stirring assemblies are symmetrically located on both sides of the injection pump and are connected to the injection pump by pipelines;

[0030] The stirring assembly includes injection valves 1, 7, vent valves 2, 8, stirring intermediate containers a, b connected to the injection valves and vent valves via pipelines at the top, evacuation valves 3, 9 and air pressure valves 4, 10 connected to the bottom of the stirring intermediate container via pipelines, and liquid outlet valves 5, 11 and liquid replenishing valves 6, 12 connected to the evacuation valves and the air pressure valves via pipelines;

[0031] The injection valves 1 and 7 at the top of each of the two stirring components are connected by pipelines, and the liquid outlet valves 5 and 11 at the bottom of each of the two stirring components are connected by pipelines. A stirring outlet is provided between the two liquid outlet valves, and the injection pump is provided between the two injection valves.

[0032] In this embodiment, the two stirring components and the valve pipelines connected thereto are formed. The entire system is bilaterally symmetrical, wherein the two stirring components are identical.

[0033] As an embodiment of the present invention, the system also includes a corresponding software control module, which is connected to the injection valves 1, 7, the vent valves 2, 8, the vacuum valves 3, 9, the air pressure valves 4, 10, the liquid outlet valves 5, 11 and the liquid replenishing valves 6, 12, so as to control the opening and closing of the injection valves, the vent valves, the vacuum valves, the air pressure valves, the liquid outlet valves and the liquid replenishing valves.

[0034] In a specific embodiment of the present invention, in the initial state, the pistons of the two stirring components are both located at the top of the stirring intermediate container with the help of the air pressure valves 4 and 10, and the vent valves 2 and 8 are then opened to vacuum the lower cavities of the two pistons respectively, and the liquid replenishing valves 6 and 12 are opened. Under the action of negative pressure, the displacement liquid is automatically sucked back into the intermediate container, and the stirring switch is turned on. The two containers are stirred at the same time, and the software control module is started. The injection pump starts working, and the stirring intermediate container a starts working at the same time. The software control module controls the opening of the injection valve 1 and the liquid outlet valve 5. In order to keep the injection pressure unchanged when the two agitators are used alternately, the injection valve 7 is opened at the same time.

[0035] When the agitator container a drives out 95% of the volume of the liquid, the software control module controls the opening of the liquid outlet valve 11, and after a delay of 3 seconds, closes the liquid outlet valve 5 and the liquid injection valve 1. The stirring intermediate container b takes over the work of the stirring intermediate container a. At this time, the vent valve 2 on the stirring intermediate container a is opened, and then the air pressure valve 4 is also opened. Under the action of air power, the piston moves upward, and the power liquid at the upper end of the container is discharged into the water storage tank through the vent valve 2.

[0036] When the piston of the agitator container a reaches the top, the software control module closes the air pressure valve 4 and the vent valve 2, opens the evacuation valve 3, and evacuates the lower end of the agitator container a. Then, the evacuation valve 3 is closed in sequence, and the refill valve 6 is opened. The displacement liquid is sucked back into the lower end of the agitator intermediate container a under negative pressure. Finally, the refill valve 6 is closed, completing the automatic refill process of the displacement liquid in container a. Open the injection valve 1.

[0037] When 95% of the volume of liquid is expelled from stirring intermediate container B, the liquid outlet valve 5 is automatically opened. After a delay of 3 seconds, the liquid outlet valve 11 and the liquid injection valve 7 are closed. The stirring intermediate container A takes over the operation of stirring intermediate container B. The two stirring intermediate containers work alternately, achieving the purpose of unattended and continuous operation.

[0038] Recording of injection volume data: When the piston of the stirring intermediate container a descends, its displacement sensor begins to measure the displacement, transmits the signal to the computer, and records it as L1. When it ascends, no data is recorded. When the piston of the stirring intermediate container b descends, its displacement sensor begins to measure the displacement, and records it as L2. Similarly, when the piston of the stirring intermediate container a descends again, it records it as L3. The same cycle repeats until the injection stops. The total displacement L = L1 + L2 + L3 + ..., and the total injection volume is Q = L*πR 2 , where R is the inner radius of the stirring intermediate container.

[0039] As an embodiment of the present invention, Figure 2 The figure shows a schematic structural diagram of the stirring intermediate container a in an embodiment of the present invention, which includes an upright cylindrical shell a6, a piston a10 is provided inside the cylindrical shell a6, and the piston a10 can move up and down. The cylindrical shell a6 is divided into an upper cavity and a lower cavity which are independent of each other by the piston a10. An upper plug a8 is provided at the upper end of the cylindrical shell a6, and a displacement sensor a12 is provided outside the cylindrical shell a6. The displacement sensor a12 is connected to the piston a10 in turn through a connecting rod a13 and a displacement rod a7. The displacement rod a7 passes through the upper plug a8. A stirring paddle a5 is provided in the lower cavity, and a stirring motor a2 is provided outside the lower end of the cylindrical shell a6. The stirring paddle a5 is connected to the stirring motor a2 through a transmission mechanism.

[0040] In this embodiment, the intermediate stirring container a further includes a control unit and a display unit, both of which are connected to the control unit. The displacement sensor a12 can measure the displacement of the piston a10 and transmit the displacement information to the control unit. The control unit can calculate the volume of liquid discharged from the intermediate stirring container a based on the displacement of the piston a10 and the inner diameter of the cylindrical housing a6. The display unit can display the discharged liquid volume in real time.

[0041] In this embodiment, the connecting rod a13 is in a horizontal state, the connecting rod a13 is located outside the cylindrical shell a6, the left end of the connecting rod a13 is connected to the displacement sensor a12, the right end of the connecting rod a13 is connected to the upper end of the displacement rod a7, the displacement rod a7 is in an upright state, the lower end of the displacement rod a7 is connected and fixed to the piston a10, the axis of the displacement rod a7 coincides with the axis of the cylindrical shell a6, and the displacement sensor a12 can measure the displacement of the piston a10 through the connecting rod a13 and the displacement rod a7.

[0042] In this embodiment, the upper plug a8 is provided with a liquid injection port a9, which is connected to the liquid injection valve 1 and the vent valve 2 via pipelines. The liquid injection port a9 communicates with the upper cavity of the cylindrical shell a6, allowing liquid outside the cylindrical shell a6 to be injected into the upper cavity of the cylindrical shell a6 through the liquid injection port a9. The lower portion of the cylindrical shell a6 is provided with a liquid outlet a11, which is connected to the evacuation valve 3 and the air pressure valve 4 via pipelines. The liquid outlet a11 communicates with the lower cavity of the cylindrical shell a6, allowing liquid in the lower cavity of the cylindrical shell a6 to be discharged through the liquid outlet a11. The stirring paddle a5 is located at the lower portion of the lower cavity.

[0043] In this embodiment, the stirring intermediate container a also includes a chassis a1, a cylindrical shell a6 and the chassis a1 are arranged above and below each other, and the stirring motor a2 is located inside the cylindrical shell a6 and below the cylindrical shell a6. A cylindrical base a14 is provided between the cylindrical shell a6 and the chassis a1, and the lower end of the cylindrical shell a6 is inserted into the upper end of the cylindrical base a14. The cylindrical base a14 is fixedly connected to the chassis a1, and the stirring motor a2 is fixedly connected to the chassis a1. Figure 2 shown.

[0044] In this embodiment, in order to ensure the sealing of the lower cavity of the cylindrical shell a6, the transmission mechanism includes an outer magnetic sleeve assembly a3 and an inner magnetic sleeve assembly a4, and the stirring motor a2, the outer magnetic sleeve assembly a3, the inner magnetic sleeve assembly a4 and the stirring paddle a5 are connected in sequence from bottom to top. The outer magnetic sleeve assembly a3 includes an outer magnet a33 and an outer shell a31 that are fixedly sleeved inside and outside, and the inner magnetic sleeve assembly a4 includes an inner magnet a41, a stirring rod a42 and an inner shell a43 that are sleeved in sequence from inside to outside. The inner magnet a41 and the stirring rod a42 are fixedly connected, and the upper end of the stirring rod a42 is connected to the stirring paddle a5. The inner shell a43 is a cylindrical structure with a closed lower end and an open upper end. The open end of the inner shell a43 is sealed and fixedly connected to the cylindrical base a14. The inner shell a43 is sleeved in the outer magnet a33, and the outer shell a31 is connected to the output shaft of the stirring motor a2, as shown in FIG. Figures 3 to 5 A plane bearing a32 may be provided in the outer shell a31, and the inner shell a43 is connected to the outer shell a31 via the plane bearing a32.

[0045] Among them, the axis of the outer magnet a33, the axis of the outer shell a31, the axis of the inner magnet a41, the axis of the stirring rod a42 and the axis of the inner shell a43 all coincide with the axis of the cylindrical shell a6. The outer magnet a33 is sleeved outside the inner magnet a41. The outer magnet a33 contains multiple outer magnet bars arranged along the circumference, and the inner magnet a41 contains multiple inner magnet bars arranged along the circumference. The outer magnet bars of the outer magnet a33 and the corresponding inner magnet bars of the inner magnet a41 have opposite polarities, so they can attract each other, as shown in FIG. Figure 6 In this way, when the outer magnet a33 rotates with the axis of the cylindrical shell a6 as the axis, it can drive the inner magnet a41 to rotate with the axis of the cylindrical shell a6 as the axis.

[0046] In addition, the piston a10 is sealed and fixed to the cylindrical shell a6, the upper end of the cylindrical shell a6 is sealed and fixed to the upper plug a8, the lower end of the cylindrical shell a6 is sealed and fixed to the upper end of the cylindrical base a14, the cylindrical base a14 is connected and fixed to the chassis a1, and the lower end of the cylindrical base a14 is sealed and fixed to the upper end of the inner shell a43.

[0047] In this embodiment, the cylindrical housing a6 is cylindrical and made of 1Cr18Ni9Ti. It is lightweight, corrosion-resistant, and pressure-resistant. The displacement sensor 12 is a high-precision digital grating magnetic displacement sensor. The chassis a1 is equipped with a control system connected to the software control module to control the stirring paddle's on / off function and stirring speed. The upper chamber of the cylindrical housing a6 is used to hold the power fluid, typically distilled water. The lower chamber of the cylindrical housing a6 is used to hold the displacement fluid, typically an oil displacement chemical.

[0048] The outer end of the liquid injection port a9 on the cylindrical shell a6 is connected to the liquid injection valve, the vent valve, and the injection pump power unit via stainless steel pipelines. By injecting power liquid into the upper chamber of the cylindrical shell a6 through the liquid injection port a9, the piston a10 is pushed downward continuously, driving the displaced liquid below the piston a10 to flow out through the liquid outlet a11. The amount of liquid displaced by the downward movement of the piston a10 is automatically calculated and displayed by the control unit and display unit. The displacement data recorded by the displacement sensors of the two intermediate containers is calculated by the control unit and displayed on the display unit.

[0049] When stirring is required, the stirring motor a2 is started, and the output shaft of the stirring motor a2 drives the outer magnet a33 and the outer shell a31 to rotate around the axis of the cylindrical shell a6. The inner shell a43 neither moves nor rotates. Due to the action of the magnetic force, the inner magnet a41 and the stirring rod a42 will also rotate around the axis of the cylindrical shell a6, thereby driving the stirring paddle a5 to rotate around the axis of the cylindrical shell a6.

[0050] The present invention also involves incorporating a heating device into the control box of the stirring assembly, allowing the system to be used directly for high-temperature flooding experiments. Due to its stirring and other functions, the system can be used as a reactor for chemical reaction experiments involving oilfield chemicals, and then injected directly into a flooding model, achieving simultaneous chemical reaction and injection. Because the system features continuous liquid injection, disabling the stirring function allows it to be used for saturating crude oil prior to large-scale core flooding experiments. This eliminates the need to shut down the injection system at night, improving the efficiency of core flooding experiments. By controlling the stirring frequency, the present invention allows for studying the impact of shear properties on injection, plugging, and flooding performance.

[0051] The present invention has the advantages of not needing to shut down the injection system at night and improving the working efficiency of the core displacement experiment. It can perform uninterrupted injection and automatically measure the injection volume without manual supervision, and has the advantages of saving manpower and being intelligent.

[0052] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional injection system capable of continuous injection, characterized in that: The system includes an injection pump and two stirring assemblies connected by pipelines, wherein the two stirring assemblies are symmetrically located on both sides of the injection pump and are connected to the injection pump through pipelines; The stirring assembly includes a liquid injection valve, a vent valve, a stirring intermediate container with a top connected to the liquid injection valve and the vent valve through pipelines, a vacuum valve and an air pressure valve connected to the bottom of the stirring intermediate container through pipelines, and a liquid outlet valve and a liquid replenishing valve connected to the vacuum valve and the air pressure valve through pipelines; The injection valves at the top of each of the two stirring assemblies are connected by a pipeline, and the liquid outlet valves at the bottom of each of the two stirring assemblies are connected by a pipeline, a stirring outlet is provided between the two liquid outlet valves, and the injection pump is provided between the two injection valves; The system further includes a software control module electrically connected to the injection valve, the vent valve, the evacuation valve, the air pressure valve, the liquid outlet valve, and the liquid replenishing valve to control the opening and closing of the injection valve, the vent valve, the evacuation valve, the air pressure valve, the liquid outlet valve, and the liquid replenishing valve; In the initial state, the pistons of the two stirring components are both located at the top of the stirring intermediate container with the help of the air pressure valve and the vent valve. The evacuation valve is opened to vacuum the cavities below the two pistons respectively. The liquid replenishing valve is opened. Under the action of negative pressure, the displacement liquid is automatically sucked back into the stirring intermediate container. The stirring switch is turned on. The two stirring intermediate containers are stirred at the same time. The software control module is started, the injection pump starts to work, and at the same time, one of the stirring intermediate containers starts to work. The software control module controls the opening of one of the injection valves and the liquid outlet valve, and at the same time, the other injection valve is opened. In which, the stirring intermediate container includes an upright cylindrical shell, a piston is provided inside the cylindrical shell, and the cylindrical shell is divided into an upper cavity and a lower cavity that are independent of each other by the piston. An upper plug is provided at the upper end of the cylindrical shell, and a displacement sensor is provided outside the cylindrical shell. The displacement sensor is connected to the piston in turn through an external connecting rod and a displacement rod. The displacement rod passes through the upper plug. A stirring paddle is provided in the lower cavity, and a stirring motor is provided outside the lower end of the cylindrical shell. The stirring paddle is connected to the stirring motor through a transmission mechanism.

2. The system according to claim 1, wherein: The stirring intermediate container further includes a control unit and a display unit, and both the display unit and the displacement sensor are connected to the control unit.

3. The system according to claim 1, wherein: The external connecting rod is in a horizontal state, the displacement rod is in an upright state, and the displacement sensor can measure the displacement of the piston through the external connecting rod and the displacement rod.

4. The system according to claim 1, wherein: The upper plug is provided with a liquid injection port, through which liquid can enter the upper cavity of the cylindrical shell.

5. The system according to claim 1, wherein: A liquid outlet is provided at the lower portion of the cylindrical shell, and the liquid in the lower cavity of the cylindrical shell can be discharged through the liquid outlet. The stirring paddle is located at the lower portion of the lower cavity.

6. The system according to claim 1, wherein: The stirring intermediate container further includes a machine case, and the cylindrical shell and the machine case are arranged up and down.

7. The system according to claim 6, characterized in that A cylindrical base is provided between the cylindrical shell and the chassis, and the lower end of the cylindrical shell is plugged into the upper end of the cylindrical base.

8. The system according to claim 7, characterized in that The transmission mechanism comprises an outer magnetic sleeve assembly and an inner magnetic sleeve assembly, and the stirring motor, the outer magnetic sleeve assembly, the inner magnetic sleeve assembly and the stirring paddle are connected in sequence.

9. The system according to claim 8, characterized in that The outer magnetic sleeve assembly includes an outer magnet and an outer shell arranged inside and outside. The inner magnetic sleeve assembly includes an inner magnet, a stirring rod and an inner shell arranged in sequence from the inside to the outside. The stirring rod is connected to the stirring paddle. The inner shell is a cylindrical structure with one end closed and the other end open. The open end of the inner shell is sealed and fixedly connected to the cylindrical base. The inner shell is sleeved in the outer magnet, and the outer shell is connected to the output shaft of the stirring motor.

10. The system according to claim 1, wherein: The cylindrical shell is cylindrical, and the material of the cylindrical shell is 1Cr18Ni9Ti.

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