Low-pulsation stable flow pressure system

Abstract

The invention discloses a low-pulsation steady flow pressure system, which relates to the technical field of fluid transportation and control, and comprises a series / parallel double-pump module, a filter, a pulsation damper, a sensor and a control center, the series / parallel double-pump module, the filter, the pulsation damper and the sensor are sequentially connected in series, and the control center is connected with the filter. The control center is in circuit connection with the serial / parallel double-pump module and the sensor; the series / parallel double-pump module consists of two micro diaphragm pumps and is used for generating complementary pulsation fluid output; by arranging the series / parallel double-pump module, the filter, the pulsation damper, the sensor and the control center, the flow pulsation is remarkably reduced through the complementary effect of the double pumps, and the output stability is improved; dynamic adjustment is achieved through closed-loop feedback control of the control center, and the response speed is increased; due to the design of the compact pulsation damper, the size of the system is reduced, and integrated installation is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid delivery and control, and in particular to a low-pulsation stable flow and pressure system. Background Art

[0002] Microdiaphragm pumps are widely used in precision fluid delivery and control applications such as medical dialysis, drug injection, and microfluidic chips due to their compact structure, strong sealing, and pollution-free operation. However, their inherent operating characteristics lead to periodic pulsation in the output flow, which has become a core technical bottleneck restricting high-precision fluid control. This pulsation not only causes flow measurement errors and affects process stability, but can even cause equipment failure in sensitive scenarios.

[0003] For example, installing a positive displacement damper at the pump outlet to absorb pressure fluctuations can partially smooth the flow rate. However, to achieve effective damping, a buffer container several times the volume of the pump body is often required, which seriously sacrifices the compactness of the system. The increased fluid cavity will also lead to response lag, making it difficult to adapt to dynamic flow regulation needs. Using multi-pump phase differences to offset pulsation. While this solution can reduce pulsation amplitude, it lacks a real-time closed-loop feedback mechanism and relies solely on open-loop phase control. This makes it impossible to dynamically compensate for pulsation drift caused by load changes, wear, or fluctuations in fluid properties, resulting in insufficient long-term stability. The diaphragm motion curve is optimized by adjusting the motor speed to suppress pulsation. This method places extremely high demands on sensor accuracy and high-speed control systems, resulting in a surge in costs. In addition, under low-flow conditions, the suppression effect is sharply reduced due to the mechanical nonlinear characteristics of the pump.

[0004] The existing technology has the following shortcomings: Therefore, although the operation of adding a damper to a single pump in the existing technology is relatively simple, it sacrifices the compactness of the system; multiple pumps in parallel or series lack closed-loop control and cannot achieve dynamic adjustment; frequency conversion control is expensive and too dependent on hardware. There is an urgent need for a low-pulsation smooth flow pressure system that can effectively reduce pulsation while taking into account the system compactness and cost.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a low-pulsation smooth flow pressure system, which solves the problems in the above-mentioned background technology by setting up a series / parallel dual pump module, a filter, a pulsation damper, a sensor and a control center structure.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a low-pulsation smooth flow pressure system, comprising a series / parallel dual-pump module, a filter, a pulsation damper, a sensor, and a control center, wherein the series / parallel dual-pump module, the filter, the pulsation damper, and the sensor are sequentially connected in series, and the control center is circuit-connected to the series / parallel dual-pump module and the sensor; The series / parallel dual-pump module consists of two miniature diaphragm pumps, which are used to generate complementary pulsating fluid outputs. The structural design of the series / parallel dual-pump module allows the pulsations of the two pumps to offset each other, reducing the pulsation amplitude of the fluid output from the source, providing a more stable initial flow and pressure foundation for the entire system, and avoiding the adverse effects of large fluctuations in flow and pressure on subsequent equipment and processes; The filter is connected to the inlet end of the series / parallel dual pump module, and is used to intercept fluid impurities, stabilize the flow of fluid in the series / parallel dual pump module, make the fluid entering the dual pump module more uniform, and protect the series / parallel dual pump module and subsequent equipment, preventing impurities from causing damage such as wear and blockage to the pump body and other components, thereby extending the service life of the equipment; The pulsation damper is connected to the outlet of the series / parallel dual pump module to absorb residual pulsation. After the complementary pulsation output of the dual pumps and further processing by the pulsation damper, the system can reduce the pulsation of the fluid to an extremely low level, achieving highly stable flow and pressure output; The sensor is provided at the outlet of the pulsation damper and is used to detect flow or pressure data in real time. Through the real-time monitoring mechanism, the control center can timely and accurately grasp the operating status of the system, providing reliable data support for subsequent dynamic adjustment; The control center receives the real-time flow / pressure signal fed back by the sensor, and calculates the current pulsation error value to dynamically adjust the driving frequency / speed of the series / parallel dual pump module to eliminate the pulsation error. The control center automatically adjusts the operating parameters of the pump according to the actual operation of the system, eliminates the pulsation error in time, and ensures that the system can maintain stable flow and pressure output under different working conditions.

[0008] Optionally, the control logic of the series / parallel dual pump module is as follows: An initial phase difference θ is set for the two micro-diaphragm pumps so that the flow pulsation troughs and peaks generated by the two pumps cancel each other out. When the sensor detects that the residual pulsation amplitude exceeds a threshold, the control center dynamically adjusts the phase difference θ or the single pump driving frequency.

[0009] Optionally, the control center eliminates the pulsation error in the following steps: Performing a fast Fourier transform (FFT) on the sensor feedback signal to extract the dominant pulsation frequency component; An anti-phase compensation signal is generated based on the dominant frequency component and added to the dual pump drive command.

[0010] Optionally, the pulsation damper is a stainless steel bellows structure, and the volume of the pulsation damper is associated with the flow rate output by the series / parallel dual pump module, wherein the volume calculation formula of the pulsation damper is V l =κ l Q max , and κ l ∈0.1-0.3L·min / ml, where V l Expressed as the volume of the pulsation damper, κ l Expressed as the damping coefficient, Q max It represents the maximum output flow of the series / parallel dual pump module.

[0011] Optionally, when the series / parallel dual pump module is configured in parallel, the inlet ends of the two micro-diaphragm pumps converge to the common filter, and the outlet ends diverge to the pulsation damper, and at this time the sensor is a flow sensor; When the series / parallel dual pump module adopts a series configuration, the outlet of the first micro-diaphragm pump is directly connected to the inlet of the second micro-diaphragm pump, the outlet of the second micro-diaphragm pump is connected to the pulsation damper, and the sensor is a pressure sensor.

[0012] Optionally, the rated flow range of the micro diaphragm pump is 0.5L / min-10L / min, and the pump body is made of corrosion-resistant engineering plastic; the measurement error of the sensor is ≤±0.5% FS, and the sampling frequency is ≥100Hz.

[0013] Optionally, the pulsation damper can be replaced with an airbag or piston structure, but it must meet the volume ratio relationship V l ≥0.1·Q max .

[0014] Optionally, the control center has a built-in pump health monitoring module, which predicts the performance degradation of the micro-diaphragm pump by analyzing the correlation between the driving current and the flow feedback and automatically switches to a spare micro-diaphragm pump group; The series / parallel dual pump module can be expanded to a three-pump parallel or series structure, and the control center independently allocates a drive phase to each micro diaphragm pump to achieve triple pulsation compensation.

[0015] Optionally, a low-pulsation smooth flow pressure control method comprises the following steps: S1. At the medium input end, install the filter at the inlet end of the series / parallel dual pump module, connect the pulsation damper and the sensor, and seal the pipeline; S2. Set the target flow / pressure value and pulsation error threshold in the control center, calibrated as F target , δ max ; S3, the control center drives the series / parallel dual pump modules with an initial phase difference θ to generate a fluid output with mutually canceled pulsations; S4, after the fluid is physically filtered by the pulsation damper, the sensor detects the real-time output value and calibrates it as F real ; S5. The control center calculates the pulsation error and adjusts the current driving parameters. The calculation formula of the pulsation error is δ=|F real -F target |, when δ≤δ max When δ>δ max When the dual pump drive frequency, speed or phase difference θ is adjusted dynamically until δ≤δ max ; S6. When the efficiency of a single pump decreases and δ continues to exceed the standard, the control center switches to the backup micro-diaphragm pump group and issues an alarm.

[0016] In the above technical solution, the technical effects and advantages provided by the present invention are: The present invention sets up a structure of series / parallel dual pump module, filter, pulsation damper, sensor and control center. The series / parallel dual pump module consists of two miniature diaphragm pumps, which can generate complementary pulsating fluid output. This unique design makes the pulsation of the two pumps cancel each other, reducing the pulsation amplitude of the fluid output from the source, providing a more stable initial flow and pressure basis for the entire system, avoiding the adverse effects of large fluctuations in flow and pressure on subsequent equipment and processes. The filter is connected to the inlet end of the series / parallel dual pump module in order to intercept fluid impurities, but it can also stabilize the fluid flow to a certain extent, so that the flow entering the dual pump module The fluid is more uniform, and the pulsation damper is connected to the outlet of the series / parallel dual-pump module, specifically for absorbing residual pulsation. After the dual-pump complementary pulsation output and further processing by the pulsation damper, the system can reduce the pulsation of the fluid to an extremely low level, achieving highly stable flow and pressure output. The complementary effect of the dual pumps significantly reduces flow pulsation and improves output stability. The filter design structure not only protects the series / parallel dual-pump module and subsequent equipment, preventing impurities from causing wear and blockage on the pump body and other components, thereby extending the service life of the equipment, but also ensures the quality of the output fluid, meeting application scenarios with high requirements for fluid purity. The sensor is installed at the outlet of the pulsation damper and can detect flow or pressure data in real time and feed this data back to the control center. This real-time monitoring mechanism enables the control center to grasp the operating status of the system in a timely and accurate manner, providing reliable data support for subsequent dynamic adjustment. After receiving the real-time flow / pressure signal feedback from the sensor, the control center dynamically adjusts the drive frequency / speed of the series / parallel dual pump module by calculating the current pulsation error value. Therefore, the closed-loop feedback control of the control center realizes dynamic adjustment, improves the response speed, eliminates pulsation errors in a timely manner, ensures that the system can maintain stable flow and pressure output under different working conditions, and greatly improves the adaptability and stability of the system. The compact pulsation damper design reduces the system volume and facilitates integrated installation. At the same time, it reduces the equipment failure rate and maintenance costs, improves the overall operating efficiency and stability of the system, and has strong versatility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction to the drawings required for use in the embodiments will be given below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 This is a series-parallel structural block diagram of the low-pulsation smooth flow and pressure system of the present invention.

[0019] The accompanying drawings are marked as follows: 1. series / parallel dual pump module; 2. filter; 3. pulsation damper; 4. sensor; 5. control center. DETAILED DESCRIPTION

[0020] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0021] The present invention provides Figure 1 A low-pulsation smooth flow pressure system shown includes a series / parallel dual pump module 1, a filter 2, a pulsation damper 3, a sensor 4, and a control center 5. The series / parallel dual pump module 1, the filter 2, the pulsation damper 3, and the sensor 4 are connected in series in sequence, and the control center 5 is circuit-connected to the series / parallel dual pump module 1 and the sensor 4. The series / parallel dual-pump module 1 consists of two miniature diaphragm pumps, which are used to generate complementary pulsating fluid outputs. The structural design of the series / parallel dual-pump module 1 allows the pulsations of the two pumps to offset each other, reducing the pulsation amplitude of the fluid output at the source, providing a more stable initial flow and pressure foundation for the entire system, and avoiding the adverse effects of large fluctuations in flow and pressure on subsequent equipment and processes; The filter 2 is connected to the inlet end of the series / parallel dual pump module 1 to intercept fluid impurities, stabilize the flow of fluid in the series / parallel dual pump module 1, make the fluid entering the dual pump module more uniform, and protect the series / parallel dual pump module and subsequent equipment, preventing impurities from causing damage such as wear and blockage to the pump body and other components, thereby extending the service life of the equipment; The pulsation damper 3 is connected to the outlet of the series / parallel dual pump module 1 to absorb residual pulsation. After the complementary pulsation output of the dual pumps and further processing by the pulsation damper, the system can reduce the pulsation of the fluid to an extremely low level, achieving highly stable flow and pressure output; Sensor 4 is installed at the outlet of pulsation damper 3 to detect flow or pressure data in real time. Through the real-time monitoring mechanism, the control center can grasp the operating status of the system in a timely and accurate manner, providing reliable data support for subsequent dynamic adjustment. The control center 5 receives the real-time flow / pressure signal fed back by the sensor 4, and calculates the current pulsation error value to dynamically adjust the driving frequency / speed of the series / parallel dual pump module 1 to eliminate the pulsation error. The pump operating parameters are automatically adjusted according to the actual operation of the system to eliminate the pulsation error in time, ensuring that the system can maintain stable flow and pressure output under different working conditions.

[0022] Specifically, the control logic of the series / parallel dual pump module 1 is as follows: An initial phase difference θ is set for the two micro-diaphragm pumps so that the flow pulsation troughs and peaks generated by the two pumps cancel each other out. When the sensor 4 detects that the residual pulsation amplitude exceeds a threshold value, the control center 5 dynamically adjusts the phase difference θ or the single pump driving frequency.

[0023] Specifically, the steps for the control center 5 to eliminate the pulsation error are as follows: Perform fast Fourier transform (FFT) on the feedback signal of sensor 4 to extract the dominant pulsation frequency component; An anti-phase compensation signal is generated based on the dominant frequency component and added to the dual pump drive command.

[0024] Specifically, the pulsation damper 3 is a stainless steel bellows structure, and the volume of the pulsation damper 3 is associated with the flow rate output by the series / parallel dual pump module 1. The volume calculation formula of the pulsation damper 3 is V l =κl Q max , and κ l ∈0.1-0.3L·min / ml, where V l Expressed as the volume of the pulsation damper 3, κ l Expressed as the damping coefficient, Q max Indicates the maximum output flow of the series / parallel dual pump module 1.

[0025] Specifically, when the series / parallel dual pump module 1 is in parallel configuration, the inlet ends of the two micro-diaphragm pumps converge to the common filter 2, and the outlet ends are divided to the pulsation damper 3, and at this time the sensor 4 adopts a flow sensor; When the series / parallel dual pump module 1 adopts a series configuration, the outlet of the first micro-diaphragm pump is directly connected to the inlet of the second micro-diaphragm pump, the outlet of the second micro-diaphragm pump is connected to the pulsation damper 3, and the sensor 4 is a pressure sensor.

[0026] Specifically, the rated flow range of the micro diaphragm pump is 0.5 L / min-10 L / min, and the pump body is made of corrosion-resistant engineering plastic; the measurement error of the sensor 4 is ≤±0.5% FS, and the sampling frequency is ≥100 Hz.

[0027] Specifically, the pulsation damper 3 can be replaced by an airbag or piston structure, but it must meet the volume ratio relationship V l ≥0.1·Q max .

[0028] Specifically, the control center 5 has a built-in pump health monitoring module that predicts the performance degradation of the micro-diaphragm pump and automatically switches to a standby micro-diaphragm pump group by analyzing the correlation between the driving current and the flow feedback; The series / parallel dual pump module 1 can be expanded to a three-pump parallel or series structure, and the control center 5 independently allocates a drive phase to each micro diaphragm pump to achieve triple pulsation cancellation.

[0029] Specifically, a low-pulsation steady flow pressure control method includes the following steps: S1. At the medium input end, install the filter 2 at the inlet end of the series / parallel dual pump module 1, connect the pulsation damper 4 and the sensor 4, and seal the pipeline so that the filter 2 is connected to the inlet end of the series / parallel dual pump module 1 and the pulsation damper 3 is connected to the outlet end of the series / parallel dual pump module 1; S2. Set the target flow / pressure value and pulsation error threshold in the control center 5, calibrated as F target , δ max ; S3, the control center 5 drives the series / parallel dual pump module 1 with an initial phase difference θ to generate a fluid output with mutually canceled pulsations; S4, after the fluid is physically filtered by the pulsation damper 3, the real-time output value is detected by the sensor 4 and calibrated as F real ; S5, the control center 5 calculates the pulsation error and adjusts the current drive parameters. The calculation formula of the pulsation error is δ=|F real -F target |, when δ≤δ max When δ>δ max When the dual pump drive frequency, speed or phase difference θ is adjusted dynamically until δ≤δ max ; S6. When the efficiency of a single pump decreases and δ continues to exceed the standard, the control center 5 switches to the backup micro-diaphragm pump group and issues an alarm.

[0030] The above formulas are all dimensionless and numerical calculations. The formulas are obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formulas are set by technicians in this field according to actual conditions.

[0031] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via wired or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0032] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0033] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0034] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A low pulsation steady flow pressure system, characterized in that: The invention comprises a series / parallel dual pump module (1), a filter (2), a pulsation damper (3), a sensor (4) and a control center (5), wherein the series / parallel dual pump module (1), the filter (2), the pulsation damper (3) and the sensor (4) are sequentially connected in series, and the control center (5) is circuit-connected with the series / parallel dual pump module (1) and the sensor (4); The series / parallel dual pump module (1) is composed of two micro diaphragm pumps for generating complementary pulsating fluid outputs; The filter (2) is connected to the inlet end of the series / parallel dual pump module (1) and is used to intercept fluid impurities; The pulsation damper (3) is connected to the outlet end of the series / parallel dual pump module (1) and is used to absorb residual pulsation; The sensor (4) is arranged at the outlet end of the pulsation damper (3) and is used to detect flow or pressure data in real time; The control center (5) receives the real-time flow / pressure signal fed back by the sensor (4), and calculates the current pulsation error value to dynamically adjust the driving frequency / speed of the series / parallel dual pump module (1) to eliminate the pulsation error.

2. A low pulsation smooth flow pressure system according to claim 1, characterized in that: The control logic of the series / parallel dual pump module (1) is as follows: An initial phase difference θ is set for the two micro-diaphragm pumps so that the flow pulsation troughs and peaks generated by the two pumps cancel each other out. When the sensor (4) detects that the residual pulsation amplitude exceeds a threshold value, the control center (5) dynamically adjusts the phase difference θ or the single pump driving frequency.

3. A low pulsation smooth flow pressure system according to claim 2, characterized in that: The control center (5) eliminates the pulsation error in the following steps: Performing a fast Fourier transform (FFT) method on the feedback signal of the sensor (4) to extract the dominant pulsation frequency component; An anti-phase compensation signal is generated based on the dominant frequency component and added to the dual pump drive command.

4. A low pulsation steady flow pressure system according to claim 3, characterized in that: The series / parallel dual pump module (1) can be expanded to a three-pump parallel or series structure, and the control center (5) independently allocates a driving phase to each micro-diaphragm pump to achieve triple pulsation compensation.

5. A low pulsation steady flow pressure system according to claim 4, characterized in that: The pulsation damper (3) is a stainless steel bellows structure, and the volume of the pulsation damper (3) is associated with the flow rate output by the series / parallel dual pump module (1), wherein the volume calculation formula of the pulsation damper (3) is V l =κ l Q max , and κ l ∈0.1-0.3L·min / ml, where V l is the volume of the pulsation damper (3), κ l Expressed as the damping coefficient, Q max It is represented as the maximum output flow of the series / parallel dual pump module (1).

6. A low pulsation steady flow pressure system according to claim 5, characterized in that: When the series / parallel dual pump module (1) is in parallel configuration, the inlet ends of the two micro-diaphragm pumps converge to the common filter (2), and the outlet ends diverge to the pulsation damper (3), and at this time the sensor (4) is a flow sensor; When the series / parallel dual pump module (1) is configured in series, the outlet of the first micro-diaphragm pump is directly connected to the inlet of the second micro-diaphragm pump, the outlet of the second micro-diaphragm pump is connected to the pulsation damper (3), and the sensor (4) is a pressure sensor.

7. A low pulsation steady flow pressure system according to claim 6, characterized in that: The rated flow range of the micro diaphragm pump is 0.5L / min-10L / min, and the pump body is made of corrosion-resistant engineering plastics; the measurement error of the sensor (4) is ≤±0.5% FS, and the sampling frequency is ≥100Hz.

8. A low pulsation steady flow pressure system according to claim 7, characterized in that: The pulsation damper (3) can be replaced by an airbag or piston structure, but must meet the volume ratio relationship V l ≥0.1·Q max .

9. The low pulsation steady flow pressure system according to claim 8, characterized in that: The control center (5) has a built-in pump health monitoring module, which predicts the performance attenuation of the micro-diaphragm pump by analyzing the correlation between the driving current and the flow feedback and automatically switches to a spare micro-diaphragm pump group.

10. A low pulsation steady flow pressure system according to claim 9, characterized in that: The low-pulsation steady flow pressure control method comprises the following steps: S1. At the medium input end, install the filter (2) at the inlet end of the series / parallel dual pump module (1), connect the pulsation damper (4) and the sensor (4), and seal the pipeline; S2, set the target flow / pressure value and pulsation error threshold in the control center (5), calibrated as F target , δ max ; S3, the control center (5) drives the series / parallel dual pump module (1) with an initial phase difference θ to generate a fluid output with mutually canceled pulsations; S4, after the fluid is physically filtered by the pulsation damper (3), the sensor (4) detects the real-time output value and calibrates it as F real ; S5, the control center (5) calculates the pulsation error and adjusts the current driving parameters, wherein the calculation formula of the pulsation error is δ=|F real -F target |, when δ≤δ max When δ>δ max When the dual pump drive frequency, speed or phase difference θ is adjusted dynamically until δ≤δ max ; S6. When the efficiency of a single pump decreases and δ continues to exceed the standard, the control center (5) switches to the standby micro-diaphragm pump group and issues an alarm.

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