High pressure constant flow pump control method for fluid mixing preparation

Abstract

The application relates to a high-pressure constant-flow pump control method for fluid mixing preparation, which adopts a pulse-free high-pressure constant-flow pumping system, and the pumping system comprises at least two feeding assemblies for pumping materials in turns, and driving mechanisms corresponding to the at least two feeding assemblies and used for driving the feeding assemblies to output materials. Through the arrangement of multiple feeding assemblies working alternately, the materials are pumped, and in the replacement process, the pumping flow of the feeding assembly to be replaced is gradually increased by real-time calculation and control, and the pumping flow of the replaced feeding assembly is correspondingly reduced, so that the total flow during the replacement process remains unchanged. The application not only guarantees the stability of the pumping material flow, but also overcomes the problem of limited load of the traditional constant-flow pump, so that the preparation control method can meet the preparation requirements of the factory in terms of large scale, production line and automation, improve the preparation efficiency, and reduce the production cost.

Description

Technical Field

[0001] This invention relates to a high-pressure constant flow pump control method for fluid mixing preparation, applicable to the field of mixing preparation technology. Background Technology

[0002] In pharmaceutical, cosmetics manufacturing, food processing, biomaterials processing, and nanotechnology fields, pumping equipment is frequently required to prepare substances such as liposomes, nanoparticles, and emulsions through two-phase or multi-phase mixing using high-pressure pumps. Current production scenarios typically employ high-pressure pumps such as plunger pumps and diaphragm pumps as material pumping devices. However, these pumps require reciprocating movement of the plunger or diaphragm, along with a check valve, to draw material into the pump chamber and then push it into the preparation device. This results in continuous pulses in the material flow rate, leading to poor delivery stability. Therefore, some preparation processes requiring stable material flow rates often utilize high-pressure constant-flow pumps as material pumping devices. The working principle of a high-pressure constant-flow pump is to place the material inside a container and then generate a pressure difference through mechanical movement (such as piston pushing), thereby driving the fluid to exit from the container outlet at a constant flow rate. However, although constant flow pumps have a stable output flow rate, their principle is similar to that of a syringe. The material needs to be added into the container in advance, and the added material is all the material involved in the preparation process. Unlike plunger pumps or diaphragm pumps, they cannot continuously draw in material during the preparation process. Therefore, in practical applications, constant flow pumps are only suitable for small preparation scenarios such as laboratories, and it is difficult to meet the production needs of large-scale, automated, and production lines in factories. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention proposes a high-pressure constant flow pump control method for fluid mixing preparation.

[0004] The technical solution adopted in this invention is: a high-pressure constant flow pump control method for fluid mixing preparation, employing a pulse-free high-pressure constant flow pumping system. This pumping system includes: at least two feeding components for alternately pumping materials; a drive mechanism corresponding to each of the at least two feeding components and used to drive the corresponding feeding component to output material; each feeding component includes a storage tank for placing materials, a piston slidably connected within the storage tank, and a delivery valve located at the output end of the storage tank; the drive mechanism is connected to the piston; the at least two feeding components work alternately; and the currently operating component among the at least two feeding components is defined. The component currently in operation is the primary component, and the component that switches over and takes over the primary component's work is the secondary component. Specifically, the primary component currently in operation refers to the component that undertakes the main task of pumping materials during normal preparation periods, and the feeding component that gradually reduces the pumping flow rate after the remaining material in its storage tank is below the critical value and other feeding components start pumping. When the primary component and the secondary component have completed their alternation (i.e., the primary component's drive mechanism stops driving and its conveying valve closes), the previous secondary component will be defined as the primary component, and the next feeding component will be defined as the secondary component, repeating this takeover work.

[0005] Control methods include: S1. Drive the piston in the main component through the drive mechanism, so that the liquid storage tank in the main component operates at a preset working flow rate Q. set Pumping materials and monitoring the real-time pressure P in the storage tank of the main component. 主 and the remaining material quantity L 主 .

[0006] S2. Close the feed valve in the sub-component and drive the piston in the sub-component through the drive mechanism, while monitoring the real-time pressure P in the liquid storage tank of the sub-component. 副 When P 副 ≥P 主 When the piston in the sub-component is stopped, the internal pressure of its storage tank is maintained. Before the sub-component starts pumping material, its feed valve is closed in advance, and the inside of its storage tank is pressurized so that when the feed valve is opened, the storage tank in the sub-component can pump material at a higher initial flow rate, so that its actual flow rate can quickly reach the required working flow rate.

[0007] S3. When L 主 When the flow rate is less than or equal to the preset threshold L1, the feed valve in the sub-component is opened, and the piston in the sub-component is driven by the drive mechanism to advance, causing the liquid storage tank in the sub-component to flow at a real-time flow rate. The material is pumped, where Q0 is the instantaneous flow rate when the feed valve in the sub-component opens, which can be monitored in real time by a flow sensor; t is the opening duration of the feed valve in the sub-component, which is calculated by a timer after the feed valve opens; t0 is the time when the flow rate of the material output from the liquid storage tank in the sub-component increases from the instantaneous flow rate Q0 to the working flow rate Q.set The total upflow time, t0, is related to the back pressure P in the storage tank. 副 Size and flow rate Q set The magnitude of t0 is related to the actual value of t0. Before formal preparation, the specific value of t0 can be obtained by inputting the preparation parameters into the equipment for actual testing. k is a coefficient, and 0 < k < 3. When the value of k is closer to 0, the flow rate Q after the valve of the sub-component is opened is higher. 副 Growth to Q set The faster the speed, the steeper the flow rate growth curve. And when the k value is closer to 3, the flow rate Q after the secondary component opens the valve... 副 Growth to Q set The slower the speed, the flatter the flow rate growth curve; simultaneously, the piston in the main component is driven by the drive mechanism to reduce the propulsion speed, causing the liquid storage tank in the main component to operate at a real-time flow rate Q. 主 =Q set -Q 副 Pumping material. When the remaining material in the main component reaches a threshold, the system enters a switching state. First, the conveying valve in the secondary component is opened, and the pumping flow rate Q of the storage tank in the secondary component is calculated in real time. 副 Then, the piston is driven by the drive mechanism, causing the liquid storage tank in the sub-assembly to move according to Q. 副 The pump delivers material according to the value; simultaneously, by reducing the push on the piston in the main assembly through the drive mechanism, the flow rate of the material pumped from the storage tank in the main assembly is rapidly reduced, and according to Q... 副 Real-time adjustments are made to maintain the total flow rate of the material pumped from the storage tanks in the main and auxiliary components at Q. set .

[0008] S4. When Q 副 ≥Q set When the material flow rate pumped by the storage tank in the sub-component reaches the preset working flow rate, the handover process ends, and the drive of its piston 12 is stopped, and the sub-component takes over the work of pumping materials.

[0009] By employing a pulseless high-pressure constant-flow pumping system and control method, the preparation process can not only utilize a feeding assembly to pump materials, ensuring stable material flow, but also employ multiple feeding assemblies to take turns pumping materials. When the material added to the main assembly is about to run out, the auxiliary assembly is activated to take over. This overcomes the limitation of the limited single-pumping capacity of the constant-flow pump without shutting down the system. Furthermore, during the replacement process, the increase in the pumping flow rate of the auxiliary assembly is calculated and controlled in real time, and the pumping flow rate of the main assembly is gradually reduced based on this. This ensures that the total flow rate of materials pumped by the main and auxiliary assemblies remains constant at the preset working flow rate, avoiding material flow instability during the replacement process. This provides a basis for implementing the main and auxiliary assembly replacement scheme, ultimately achieving a preparation control method that can guarantee both material flow stability and single-batch preparation volume, meeting the needs of large-scale, automated, and production line-based production.

[0010] Furthermore, during initial operation, the pumping system first closes the conveying valve in the main component, and then drives the piston in the main component to advance via the drive mechanism. When the real-time pressure P... 主 To achieve the preset working pressure P set At this time, open the feed valve to allow the liquid storage tank in the main component to operate at the preset flow rate Q. set Pumping materials. In the initial stage of startup, due to the elastic deformation of the system and the compressibility of the fluid, the piston may apply sufficient pressure, but the material flow rate will rise slowly, resulting in a large amount of waste material generated in the early stage of preparation. Therefore, by pre-pressurizing the material before formal preparation, the material in the storage tank can reach a high instantaneous flow rate at the moment the valve is opened, thereby reducing the time for the material flow rate to rise. This not only improves efficiency but also reduces material loss.

[0011] Furthermore, each drive mechanism includes a motor, a lead screw mechanism connected to the piston and used to convert the rotational motion of the motor output shaft into the linear motion of the piston, and a reducer connected to both the motor and the lead screw mechanism. Specifically, the motor is configured as a servo motor, and the reducer transmits the rotation of the motor output shaft to the lead screw mechanism, which then converts the rotational motion into linear motion, thereby driving the piston to reciprocate along the storage tank to achieve the pumping of materials.

[0012] Furthermore, the method of controlling the pumping flow rate of the storage tank through a drive mechanism includes: a. Calculate the piston's propulsion speed in the storage tank, v = Q ÷ A, based on the calculated required flow rate Q of the material to be pumped from the storage tank. 主 Q 副 Or Q set , A is the cross-sectional area of ​​the storage tank in the direction perpendicular to the piston's movement direction; b. Calculate the motor output speed n = v × i × 60 ÷ L based on the piston's thrust speed v, where i is the reduction ratio of the reducer and L is the lead of the screw in the lead screw mechanism; c. Adjust the output speed of the motor by adjusting the input current to the motor, so that the output speed is n; After calculating the required material flow rate for each feeding component, the target flow rate is converted into motor speed so that the input current to the motor can be adjusted according to the required speed, thereby realizing the control of the pumping flow rate by the drive mechanism.

[0013] Furthermore, step S4 also includes: when Q 副 <Q set And L 主 When the flow rate is less than or equal to the preset threshold L2, the feed valve in the main component is closed and the drive to the piston in the main component is stopped. At the same time, the piston in the sub-component is accelerated through the drive mechanism so that the liquid storage tank in the sub-component operates at a working flow rate Q. set Pumping material, where L2 < L1. When the material in the main component is used up or the remaining material is insufficient to support the switching operation, and the pumping flow rate of the sub-component has not yet reached the required value, the main component is shut down and the sub-component is overclocked to increase its pumping speed, shorten the time for the sub-component flow rate to reach the working flow rate, minimize fluctuations in the flow rate of the material entering the preparation process, and reduce material loss.

[0014] Furthermore, the piston divides the inner cavity of the storage tank into a storage chamber located above the piston and an empty chamber located below the piston. The feeding assembly also includes a material input pipe and a material output pipe connected to the top of the storage tank and communicating with the storage chamber. When the drive mechanism drives the piston to retract, a negative pressure is created in the storage chamber, thereby drawing material into the storage chamber from the material input pipe. When the drive mechanism drives the piston to advance, it compresses the material in the storage chamber, allowing the material to be pumped out through the material output pipe. Specifically, the material input pipe is connected to the material cup, and the material output pipe is connected to the chip fabrication input terminal.

[0015] Furthermore, the feeding assembly also includes a sleeve surrounding the liquid storage tank and connected at its upper and lower ends to the sidewalls of the tank. The inner wall of the sleeve and the sidewalls of the tank form a jacketed cavity for containing the temperature-controlled medium. The feeding assembly also includes a medium inlet pipe and a medium outlet pipe connected to opposite sides of the sleeve and communicating with the jacketed cavity. By providing a sleeve around the liquid storage tank, heating or cooling media can be supplied to the jacketed cavity, thereby heating or freezing the materials involved in the preparation process to meet the preparation requirements of different processes.

[0016] Furthermore, at least two medium input pipes are provided, and the at least two medium input pipes are respectively connected to the upper and lower sides of the sleeve, which can make the temperature of the medium in the jacket cavity more uniform, so as to avoid uneven heating of the material in the storage tank.

[0017] Furthermore, each feeding assembly also includes a pressure sensor for detecting the real-time pressure inside the storage tank, a flow sensor for detecting the real-time flow rate of the material pumped from the storage tank, and a position sensor for detecting the position of the piston inside the storage tank, thereby monitoring the real-time pressure and flow rate of the material inside the storage tank. The piston position information monitored by the position sensor can be used to calculate and determine the amount of remaining material in the storage tank.

[0018] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The high-pressure constant flow pump control method for fluid mixing preparation in this invention sets up multiple feeding components to work alternately to pump materials. During the replacement process, the pumping flow rate of the feeding component taking over is gradually increased by real-time calculation and control, while the pumping flow rate of the replaced feeding component is correspondingly reduced. This keeps the total pumped flow rate constant during the replacement process, ensuring the stability of the pumped material flow rate and avoiding product defects caused by unstable flow. It also overcomes the problem of limited material loading capacity of traditional constant flow pumps, enabling the preparation control method to meet the preparation needs of large-scale, production line, and automation in factories, improving preparation efficiency and reducing production costs. Attached Figure Description

[0019] The following sections will describe some specific embodiments of the invention in a detailed manner, by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention; Figure 2 yes Figure 1 A side view of the feeding assembly in the illustrated embodiment; Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of the liquid storage tank at section AA in the embodiment shown; The annotations in the attached figures are explained as follows: 1. Feeding assembly; 11. Liquid storage tank; 111. Liquid storage chamber; 112. Cavity; 12. Piston; 13. Conveying valve; 14. Material input pipe; 15. Material output pipe; 16. Sleeve; 161. Jacket cavity; 162. Medium input pipe; 163. Medium output pipe; 2. Drive mechanism; 21. Motor; 22. Lead screw mechanism; 23. Reducer. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] Reference Appendix Figure 1-3 The high-pressure constant flow pump control method for fluid mixing preparation in this embodiment employs a pulse-free high-pressure constant flow pumping system. The pumping system includes: at least two feeding components 1 for alternately pumping materials; and a drive mechanism 2 corresponding to each of the at least two feeding components 1 and used to drive the corresponding feeding component 1 to output materials. Each feeding component 1 includes a storage tank 11 for holding materials, a piston 12 slidably connected within the storage tank 11, and a delivery valve 13 located at the output end of the storage tank 11. The drive mechanism 2 is connected to the piston 12. The at least two feeding components 1 operate alternately, defining at least two feeding components. In section 1, the component currently in operation is the main component, and the component that switches over and takes over the operation of the main component is the secondary component. Specifically, the main component currently in operation refers to the component that undertakes the main work of pumping materials during the normal preparation period, and the feeding component 1 whose remaining material in its storage tank 11 is below the critical value and whose pumping flow rate is gradually reduced after other feeding components 1 start pumping. When the main component and the secondary component have completed the alternation (i.e., the drive mechanism of the main component stops driving and its conveying valve is closed), the previous secondary component will be defined as the main component, and the next feeding component will be defined as the secondary component, repeating this takeover work.

[0023] Control methods include: S1. Drive the piston 12 in the main assembly via the drive mechanism 2, causing the liquid storage tank 11 in the main assembly to operate at a preset flow rate Q. set Pumping materials and monitoring the real-time pressure P in the storage tank 11 of the main component. 主 and the remaining material quantity L 主 .

[0024] S2. Close the feed valve 13 in the sub-component and drive the piston 12 in the sub-component to advance via the drive mechanism 2, while simultaneously monitoring the real-time pressure P in the liquid storage tank 11 of the sub-component. 副 When P 副 ≥P 主When the piston 12 in the sub-component is stopped, the internal pressure of its storage tank 11 is maintained. Before the sub-component starts pumping materials, its delivery valve 13 is closed in advance, and the inside of its storage tank 11 is pressurized so that when the delivery valve 13 is opened, the storage tank 11 in the sub-component can pump materials at a higher initial flow rate, so that its actual flow rate can quickly reach the required working flow rate.

[0025] S3. When L 主 When the flow rate is less than or equal to the preset threshold L1, the feed valve 13 in the sub-component is opened, and the piston 12 in the sub-component is driven forward by the drive mechanism 2, so that the liquid storage tank 11 in the sub-component flows at a real-time flow rate. The material is pumped, where Q0 is the instantaneous flow rate when the feed valve 13 in the sub-component is opened, which can be monitored in real time by a flow sensor; t is the opening duration of the feed valve 13 in the sub-component, which is calculated by a timer after the feed valve 13 is opened; t0 is the time when the flow rate of the material output from the liquid storage tank 11 in the sub-component increases from the instantaneous flow rate Q0 to the working flow rate Q. set The total upflow time, t0, is related to the pressure drop value P in the storage tank 11. 副 Size and flow rate Q set The value of t0 is related to its magnitude. Before formal preparation, the specific value of t0 can be obtained by inputting the preparation parameters into the equipment for actual testing; k is a coefficient, and 0 < k < 3. The value of the coefficient k is related to the pressure (i.e., P). 副 Size) and flow rate Q set The value of k is related to the size of the pressure; the larger the pressure value and the smaller the working flow rate, the smaller the value of k. The flow rate Q after the secondary component opens the valve is also related to this. 副 Growth to Q set The faster the speed, the steeper the flow rate growth curve. Conversely, the smaller the back pressure and the larger the working flow rate, the larger the value of k, and the greater the flow rate Q after the secondary component opens the valve. 副 Growth to Q set The slower the speed, the flatter the flow rate growth curve; at the same time, the piston 12 in the main component is driven by the drive mechanism 2 to reduce the propulsion speed, so that the liquid storage tank 11 in the main component operates at a real-time flow rate Q. 主 =Q set -Q 副 Pumping material; when the remaining material in the main component reaches a threshold, the system enters a switching state, first opening the conveying valve 13 in the secondary component, and calculating the pumping flow rate Q of the storage tank 11 in the secondary component in real time. 副 Then, the piston 12 is driven by the drive mechanism, causing the liquid storage tank 11 in the sub-assembly to move according to Q. 副 The pump delivers material according to the value; simultaneously, the drive mechanism 2 reduces the push on the piston 12 in the main assembly, causing the flow rate of the material pumped by the storage tank 11 in the main assembly to decrease rapidly, and according to Q 副Real-time adjustments are made to maintain the total flow rate of material pumped by the storage tank 11 in the main and auxiliary components at Q. set .

[0026] S4. When Q 副 ≥Q set When the material flow rate pumped by the storage tank 11 in the auxiliary component reaches the preset working flow rate, the switching process ends. At this time, the material flow rate pumped by the main component is closed and the piston 12 in the main component is stopped, and the auxiliary component takes over the work of pumping materials.

[0027] By employing a pulseless high-pressure constant-flow pumping system and control method, the preparation process can not only utilize feeding component 1 to pump materials, ensuring stable material flow, but also employ multiple feeding components 1 to take turns pumping materials. When the material added to the main component is about to run out, the auxiliary component is activated to take over. This overcomes the limitation of the limited single-pumping capacity of the constant-flow pump without shutting down the system. Furthermore, during the replacement process, the increase in the pumping flow of the auxiliary component is calculated and controlled in real time, and the pumping flow of the main component is gradually reduced based on this. This ensures that the total flow of materials pumped by the main and auxiliary components remains constant at the preset working flow, avoiding material flow instability during the replacement process. This provides a basis for implementing the replacement scheme of the main and auxiliary components, ultimately achieving a preparation control method that can guarantee both material flow stability and single-pumping capacity, meeting the needs of large-scale, automated, and production line-based production.

[0028] In a more preferred embodiment, during initial operation, the pumping system first closes the feed valve 13 in the main assembly, and then drives the piston 12 in the main assembly to advance via the drive mechanism 2. When the real-time pressure P... 主 To achieve the preset working pressure P set At that time, the feed valve 13 is opened, allowing the liquid storage tank 11 in the main component to operate at a preset flow rate Q. set Pumping materials. In the initial stage of startup, due to the elastic deformation of the system and the compressibility of the fluid, the piston 12 may apply sufficient pressure, but the material flow rate will rise slowly, resulting in a large amount of waste material generated in the early stage of preparation. Therefore, by pre-pressurizing the material before formal preparation, the material in the storage tank can reach a high instantaneous flow rate at the moment the valve is opened, thereby reducing the time for the material flow rate to rise. This not only improves efficiency but also reduces material loss.

[0029] In a more preferred embodiment, each drive mechanism 2 includes a motor 21, a lead screw mechanism 22 connected to the piston 12 and used to convert the rotational motion of the output shaft of the motor 21 into the linear motion of the piston 12, and a reducer 23 connected to the motor 21 and the lead screw mechanism 22 respectively. Specifically, the motor 21 is configured as a servo motor, and the reducer 23 transmits the rotation of the motor output shaft to the lead screw mechanism 22, which converts the rotational motion into linear motion, thereby driving the piston 12 to reciprocate along the storage tank 11 to realize the pumping of materials.

[0030] In a more preferred embodiment, the method of controlling the pumping flow rate of the liquid storage tank 11 by the drive mechanism 2 includes: a. Calculate the thrust velocity v of piston 12 in storage tank 11 based on the calculated required flow rate Q of the material pumped from storage tank 11: v = Q ÷ A, where Q represents Q 主 Q 副 Or Q set , A is the cross-sectional area of ​​the liquid storage tank 11 in the direction perpendicular to the moving direction of the piston 12; b. Calculate the output speed n of motor 21 based on the thrust speed v of piston 12, n = v × i × 60 ÷ L, where i is the reduction ratio of reducer 23 and L is the lead of screw in lead screw mechanism 22; c. Adjust the output speed of motor 21 by adjusting the input current to motor 21 so that the output speed is n; After calculating the required material flow rate for each feeding component, the target flow rate is converted into motor speed through calculation. This allows the input current to the motor to be adjusted according to the required speed, enabling the motor output shaft to rotate at the target speed, thereby achieving control of the pumping flow rate by the drive mechanism.

[0031] In a more preferred embodiment, step S4 further includes: when Q 副 <Q set And L 主 When the flow rate is less than or equal to the preset threshold L2, the feed valve 13 in the main component is closed and the drive of the piston 12 in the main component is stopped. At the same time, the piston 12 in the sub-component is accelerated through the drive mechanism 2 so that the liquid storage tank 11 in the sub-component operates at a working flow rate Q. set Pumping material, where L2 < L1. When the material in the main component is used up or the remaining material is insufficient to support the switching operation, and the pumping flow rate of the sub-component has not yet reached the required value, the main component is shut down and the sub-component is overclocked to increase its pumping speed, shorten the time for the sub-component flow rate to reach the working flow rate, minimize fluctuations in the flow rate of the material entering the preparation process, and reduce material loss.

[0032] In a more preferred embodiment, the piston 12 divides the inner cavity of the liquid storage tank 11 into a liquid storage chamber 111 located above the piston 12 and an empty cavity 112 located below the piston 12. The feeding assembly 1 also includes a material input pipe 14 and a material output pipe 15 connected to the top of the liquid storage tank 11 and communicating with the liquid storage chamber 111. When the drive mechanism 2 drives the piston 12 to retract, a negative pressure is formed in the liquid storage chamber 111, thereby drawing material from the material input pipe 14 into the liquid storage chamber 111. When the drive mechanism 2 drives the piston 12 to advance, the material in the liquid storage chamber 111 can be compressed, allowing the material to be pumped out through the material output pipe 15. Specifically, the material input pipe 14 is connected to the material cup, and the material output pipe 15 is connected to the chip fabrication input terminal.

[0033] In a more preferred embodiment, the feeding assembly 1 further includes a sleeve 16 surrounding the liquid storage tank 11 and connected at its upper and lower ends to the side wall surfaces of the liquid storage tank 11, respectively. The inner wall of the sleeve 16 and the side wall of the liquid storage tank 11 form a jacketed cavity 161 for containing a temperature-controlled medium. The feeding assembly 1 also includes a medium input pipe 162 and a medium output pipe 163 respectively connected to opposite sides of the sleeve 16 and communicating with the jacketed cavity 161. By providing the sleeve 16 around the liquid storage tank 11, heating or cooling media can be supplied to the jacketed cavity 161, thereby heating or freezing the materials involved in the preparation to meet the preparation requirements of different processes.

[0034] In a more preferred embodiment, at least two media input pipes 162 are provided, and the at least two media input pipes 162 are respectively connected to the upper and lower sides of the sleeve 16, which can make the temperature of the medium in the input jacket cavity 161 more uniform, so as to avoid uneven heating of the material in the storage tank 11.

[0035] In a more preferred embodiment, each feeding assembly 1 further includes a pressure sensor for detecting the real-time pressure inside the storage tank 11, a flow sensor for detecting the real-time flow rate of the material pumped from the storage tank 11, and a position sensor for detecting the position of the piston 12 inside the storage tank 11, thereby monitoring the real-time pressure and flow rate of the material inside the storage tank 11, and the position information of the piston 12 monitored by the position sensor can be used to calculate and determine the amount of remaining material inside the storage tank 11.

[0036] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The high-pressure constant flow pump control method for fluid mixing preparation in this invention sets up multiple feeding components to work alternately to pump materials. During the replacement process, the pumping flow rate of the feeding component taking over is gradually increased by real-time calculation and control, while the pumping flow rate of the replaced feeding component is correspondingly reduced. This keeps the total pumped flow rate constant during the replacement process, ensuring the stability of the pumped material flow rate and avoiding product defects caused by unstable flow. It also overcomes the problem of limited material loading capacity of traditional constant flow pumps, enabling the preparation control method to meet the preparation needs of large-scale, production line, and automation in factories, improving preparation efficiency and reducing production costs.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-pressure constant flow pump control method for fluid mixing preparation, characterized in that, A pulseless high-pressure constant flow pumping system is adopted. The pumping system includes: at least two feeding components (1) for pumping materials alternately, and a driving mechanism (2) corresponding to the at least two feeding components (1) and used to drive the corresponding feeding components (1) to output materials. Each feeding component (1) includes a storage tank (11) for placing materials, a piston (12) slidably connected in the storage tank (11), and a conveying valve (13) set at the output end of the storage tank (11). The driving mechanism (2) is connected to the piston (12). The at least two feeding components (1) work alternately. The currently working component among the at least two feeding components (1) is defined as the main component, and the component that switches with the current main component and takes over its work is the secondary component. The control method includes: S1. Driving the piston (12) in the main assembly by the driving mechanism (2) to make the liquid storage tank (11) in the main assembly work at a preset working flow rate Q set Pumping the material and monitoring the real-time pressure P in the liquid storage tank (11) in the main assembly 主 and the remaining amount of material L 主 in real time S2. Close the feed valve (13) in the sub-component and drive the piston (12) in the sub-component to advance through the drive mechanism (2), while monitoring the real-time pressure P in the liquid storage tank (11) in the sub-component. 副 When P 副 ≥P 主 At that time, the driving of the piston (12) in the sub-assembly is stopped and the internal pressure of its reservoir (11) is maintained; S3. When L 主 When the flow rate is less than or equal to the preset threshold L1, the feed valve (13) in the sub-component is opened, and the piston (12) in the sub-component is driven forward by the drive mechanism (2), so that the liquid storage tank (11) in the sub-component flows at a real-time flow rate. Pumping material, wherein Q0 is the instantaneous flow rate when the conveying valve (13) in the sub-component is opened, t is the opening time of the conveying valve (13) in the sub-component, and t0 is the flow rate of the material output from the storage tank (11) in the sub-component increased from the instantaneous flow rate Q0 to the working flow rate Q. set The total upflow time, k is a coefficient, and 0 < k < 3; at the same time, the piston (12) in the main component is driven by the drive mechanism (2) to reduce the propulsion speed, so that the liquid storage tank (11) in the main component is at a real-time flow rate Q. 主 =Q set -Q 副 Pumping materials; S4.When Q 副 ≥Q set At that time, the feed valve (13) in the main component is closed and the drive of the piston (12) in the main component is stopped.

2. The high-pressure constant flow pump control method for fluid mixing preparation according to claim 1, characterized in that, When the pumping system is initially in operation, the conveying valve (13) in the main component is first closed, and then the piston (12) in the main component is driven to advance by the drive mechanism (2). When the real-time pressure P 主 To achieve the preset working pressure P set At that time, the feed valve (13) is opened, allowing the liquid storage tank (11) in the main component to operate at a preset flow rate Q. set Pumping materials.

3. The high-pressure constant flow pump control method for fluid mixing preparation according to claim 1, characterized in that: Each of the drive mechanisms (2) includes a motor (21), a lead screw mechanism (22) connected to the piston (12) and used to convert the rotational motion of the output shaft of the motor (21) into the linear motion of the piston (12), and a reducer (23) connected to the motor (21) and the lead screw mechanism (22) respectively.

4. The high-pressure constant flow pump control method for fluid mixing preparation according to claim 3, characterized in that, Methods for controlling the pumping flow rate of the storage tank (11) through the drive mechanism (2) include: a. Calculate the thrust velocity v of the piston (12) in the storage tank (11) based on the calculated flow rate Q of the material pumped from the storage tank (11), where Q represents Q 主 Q 副 Or Q set A is the cross-sectional area of ​​the liquid storage tank (11) in the direction perpendicular to the direction of piston (12) movement; b. Calculate the output speed n of the motor (21) based on the thrust speed v of the piston (12) = v × i × 60 ÷ L, where i is the reduction ratio of the reducer (23) and L is the lead of the screw in the lead screw mechanism (22); c. Adjust the output speed of the motor (21) by adjusting the input current to the motor (21) so that the output speed is n.

5. The high-pressure constant flow pump control method for fluid mixing preparation according to claim 1, characterized in that, Step S4 also includes: when Q 副 <Q set And L 主 When the flow rate is less than or equal to the preset threshold L2, the feed valve (13) in the main component is closed and the driving of the piston (12) in the main component is stopped. At the same time, the piston (12) in the sub-component is accelerated by the drive mechanism (2) so that the liquid storage tank (11) in the sub-component flows at a working flow rate Q. set Pumping material, where L2 < L1.

6. The high-pressure constant flow pump control method for fluid mixing preparation according to claim 1, characterized in that: The piston (12) divides the inner cavity of the storage tank (11) into a storage cavity (111) above the piston (12) and a cavity (112) below the piston (12). The feeding assembly (1) also includes a material input pipe (14) and a material output pipe (15) connected to the top of the storage tank (11) and communicating with the storage cavity (111).

7. The high-pressure constant flow pump control method for fluid mixing preparation according to claim 1, characterized in that: The feeding assembly (1) further includes a sleeve (16) which is arranged around the periphery of the liquid storage tank (11) and whose upper and lower ends are respectively connected to the side wall surface of the liquid storage tank (11). The inner wall of the sleeve (16) and the side wall of the liquid storage tank (11) form a jacket cavity (161) for containing the temperature control medium. The feeding assembly (1) further includes a medium input pipe (162) and a medium output pipe (163) which are respectively connected to the two opposite sides of the sleeve (16) and communicate with the jacket cavity (161).

8. The high-pressure constant flow pump control method for fluid mixing preparation according to claim 7, characterized in that: At least two media input pipes (162) are provided, and at least two media input pipes (162) are respectively connected to the upper and lower sides of the sleeve (16).

9. The high-pressure constant flow pump control method for fluid mixing preparation according to claim 1, characterized in that: Each of the feeding components (1) further includes a pressure sensor for detecting the real-time pressure inside the storage tank (11), a flow sensor for detecting the real-time flow rate of the material pumped by the storage tank (11), and a position sensor for detecting the position of the piston (12) inside the storage tank (11).

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