Diaphragm pump and medical device capable of self-balancing pressure pulsation

Abstract

The application relates to the technical field of diaphragm pumps, and discloses a diaphragm pump capable of self-balancing pressure pulsation and a medical device. The diaphragm pump comprises a pump body, a pressure acquisition device, a volume adjusting assembly and a control device. The pump body is provided with a liquid inlet, a liquid outlet, an inlet buffer cavity and an outlet buffer cavity. The pressure acquisition device is configured to acquire pressure data of the liquid inlet and the liquid outlet. The volume adjusting assembly can dynamically change the volume of the inlet buffer cavity and the volume of the outlet buffer cavity. The control device is configured to determine the pressure pulsation amplitude of the liquid inlet and the liquid outlet based on the pressure data of the liquid inlet and the liquid outlet, and to control the volume adjusting assembly to dynamically configure the volume of the inlet buffer cavity and / or the volume of the outlet buffer cavity based on the pressure pulsation amplitude. The application can eliminate pressure pulsation without increasing the volume and the structural complexity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diaphragm pumps, in particular to a diaphragm pump capable of self-balancing pressure pulsation and a medical device. BACKGROUND

[0002] Pressure pulsation is an inherent problem of diaphragm pumps. Pressure pulsation in a diaphragm pump can cause unstable flow, system vibration, increased noise, and component wear. Therefore, it is crucial to suppress pulsation.

[0003] To solve the above technical problems, in related technologies, external buffer topology or multi-stage chamber topology is added to eliminate pressure pulsation. However, the above technical solutions have the defects of increasing the volume of the diaphragm pump and increasing the structural complexity of the diaphragm pump, and do not fundamentally eliminate pressure pulsation. SUMMARY

[0004] The purpose of the present application is to provide a diaphragm pump capable of self-balancing pressure pulsation and a medical device, which can eliminate pressure pulsation without increasing the volume and increasing the structural complexity.

[0005] The present application provides a diaphragm pump capable of self-balancing pressure pulsation, comprising:

[0006] A pump body is provided with a liquid inlet, a liquid outlet, an inlet buffer chamber communicating with the liquid inlet, and an outlet buffer chamber communicating with the liquid outlet;

[0007] A pressure acquisition device is configured to acquire pressure data of both the liquid inlet and the liquid outlet;

[0008] A volume adjusting assembly is movably assembled in the inlet buffer chamber and the outlet buffer chamber, and can dynamically change the volume of the inlet buffer chamber and the volume of the outlet buffer chamber when moving;

[0009] A control device is configured to determine the pressure pulsation amplitude of both the liquid inlet and the liquid outlet based on the pressure data of both the liquid inlet and the liquid outlet, and to control the volume adjusting assembly to dynamically configure the volume of the inlet buffer chamber and / or the volume of the outlet buffer chamber based on the pressure pulsation amplitude.

[0010] In some embodiments, the volume adjusting assembly comprises:

[0011] A motor is provided with a rotating shaft extending into the inlet buffer chamber or the outlet buffer chamber;

[0012] A partition plate seals the opening of the inlet buffer cavity away from the liquid inlet or the opening of the outlet buffer cavity away from the liquid outlet, and is threadedly connected with the rotating shaft, so as to be displaced in the inlet buffer cavity towards or away from the liquid inlet or in the outlet buffer cavity towards or away from the liquid outlet when the motor drives the rotating shaft to rotate.

[0013] In some embodiments, the volume adjusting assembly comprises:

[0014] A cylinder is provided with a cylinder shaft extending into the inlet buffer cavity or the outlet buffer cavity.

[0015] The partition plate is connected with the cylinder shaft, so as to be displaced in the inlet buffer cavity towards or away from the liquid inlet or in the outlet buffer cavity towards or away from the liquid outlet when the cylinder drives the cylinder shaft to be displaced.

[0016] In some embodiments, the pump body comprises:

[0017] The pump head is internally provided with a diaphragm and a power device for driving the diaphragm to be deformed.

[0018] The base is assembled on one side of the pump head provided with the diaphragm, and cooperates with the pump head to form the liquid inlet and the liquid outlet, and to open the inlet buffer cavity and the outlet buffer cavity.

[0019] In some embodiments, the base is provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel communicates the liquid inlet and the inlet buffer cavity, and the liquid outlet channel communicates the liquid outlet and the outlet buffer cavity.

[0020] In some embodiments, the pressure fluctuation amplitudes of the liquid inlet and the liquid outlet are determined based on the pressure data of the liquid inlet and the liquid outlet, comprising:

[0021] The pressure average values of the liquid inlet and the liquid outlet are determined based on the pressure data of the liquid inlet and the liquid outlet.

[0022] The pressure fluctuation amplitudes of the liquid inlet and the liquid outlet are determined based on the pressure data and the pressure average values of the liquid inlet and the liquid outlet.

[0023] In some embodiments, the volume adjusting assembly dynamically configures the volume of the inlet buffer cavity and / or the volume of the outlet buffer cavity based on the pressure fluctuation amplitudes, comprising:

[0024] when the pressure pulsation amplitude of the liquid inlet exceeds a first pressure pulsation amplitude threshold, calculating a first cavity volume value based on the flow pulsation amplitude of the pump body and the first pressure pulsation amplitude threshold, and controlling the volume adjusting assembly to configure the volume of the inlet buffer cavity as the first cavity volume value;

[0025] when the pressure pulsation amplitude of the liquid outlet exceeds a second pressure pulsation amplitude threshold, calculating a second cavity volume value based on the flow pulsation amplitude of the pump body and the second pressure pulsation amplitude threshold, and controlling the volume adjusting assembly to configure the volume of the outlet buffer cavity as the second cavity volume value.

[0026] In some embodiments, the formula for calculating the flow pulsation amplitude of the pump body is:

[0027] ,

[0028] The formula for calculating the first cavity volume value is:

[0029] ,

[0030] The formula for calculating the second cavity volume value is:

[0031] ,

[0032] wherein, is the flow pulsation amplitude of the pump body, is the single-stroke displacement of the pump body, is the operating frequency of the pump body, is the bulk modulus of the liquid, is a safety factor, is the first cavity volume value, is the second cavity volume value, is the first pressure pulsation amplitude threshold, is the second pressure pulsation amplitude threshold.

[0033] In some embodiments, the control device is further configured to reduce the operating frequency of the pump body to a preset operating frequency value, and then restore the operating frequency of the pump body to the original operating frequency value after dynamically configuring the volume of the inlet buffer cavity and / or the volume of the outlet buffer cavity.

[0034] The embodiments of the present application also provide a medical device comprising the above-mentioned diaphragm pump capable of self-balancing pressure pulsation.

[0035] The beneficial effects of the present application: introduce a buffer cavity on the side of the liquid inlet and the liquid outlet, through the dynamic adjustment of the volume mechanism of the buffer cavity, the volume of the buffer cavity is automatically optimized with the pressure fluctuation in the actual working condition, so that the required volume of the cavity is greatly reduced to achieve the same buffering performance, at the same time, the integrated adjustment assembly is directly embedded in the pump body, avoiding the problem of complex pipeline caused by external buffer tank, realizing the real-time suppression of the pressure fluctuation of the diaphragm pump, effectively eliminating the influence of flow fluctuation on the precision infusion equipment, the dynamic adjustment mechanism makes the equipment maintain stable output in a wide frequency range, at the same time, the compact structure design meets the strict requirements of medical equipment for miniaturization, on the premise of maintaining the integrity of the original pump body structure, the pressure stability is improved through the intelligent control system, solving the technical contradiction that the volume and performance of the traditional buffer device cannot be compatible. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a cross-sectional structure schematic diagram of a diaphragm pump capable of self-balancing pressure fluctuation provided by the first embodiment of the present application.

[0037] Figure 2 is Figure 1 is an enlarged schematic diagram of A in the embodiment.

[0038] Figure 3 is a partial cross-sectional structure schematic diagram of a diaphragm pump capable of self-balancing pressure fluctuation provided by the second embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0040] It should be noted that although the functional modules are divided in the device schematic diagram, and the logical order is shown in the flowchart, in some cases, the steps shown can be executed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the description and claims and drawings are used to distinguish similar objects, and are not intended to describe a specific order or sequence.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

[0042] The embodiments of the present application also provide a diaphragm pump capable of self-balancing pressure fluctuation.

[0043] For reference Figures 1 to 3In some embodiments, the self-balancing pressure pulsation diaphragm pump includes a pump body 1, a pressure acquisition device 2, a volume adjustment assembly 3, and a control device 4.

[0044] The pump body 1 has an inlet 51, an outlet 52, an inlet buffer chamber 53 connected to the inlet 51, and an outlet buffer chamber 54 connected to the outlet 52. The inlet buffer chamber 53 is a variable-volume chamber located at the end of the inlet 51, which can be implemented using a sealed chamber with a movable plate. The effective volume of the chamber is adjusted by changing the position of the baffle 32. The outlet buffer chamber 54 is a variable-volume chamber located at the end of the outlet 52, and its construction principle is symmetrical to that of the inlet buffer chamber 53. During the pumping process, external liquid enters the pump body 1 through the inlet 51 and exits from the outlet 52. The inlet buffer chamber 53 buffers the pressure pulsations at the inlet 51, and the outlet buffer chamber 54 buffers the pressure pulsations at the outlet 52.

[0045] The pressure acquisition device 2 is configured to acquire pressure data from both the inlet 51 and the outlet 52. It can be understood that the pressure acquisition device 2 refers to a group of high-frequency dynamic pressure sensors installed on the inlet 51 and the outlet 52, specifically piezoelectric or strain gauge sensors, used to capture instantaneous pressure fluctuation data.

[0046] The volume adjustment component 3 is movably mounted on the inlet buffer chamber 53 and the outlet buffer chamber 54. When the volume adjustment component 3 is in motion, it can dynamically change the volume of the inlet buffer chamber 53 and the volume of the outlet buffer chamber 54. It can be understood that the volume adjustment component 3 refers to a mechanical device with linear displacement function, which can be implemented by a screw mechanism driven by a servo motor 31 or a pneumatic actuator to achieve precise control of the position of the movable plate.

[0047] The controller 4 is configured to determine the pressure pulsation amplitude of both the inlet 51 and outlet 52 based on the pressure data from both. Based on this pressure pulsation amplitude, it controls the volume adjustment component 3 to dynamically configure the volume of the inlet buffer chamber 53 and / or the volume of the outlet buffer chamber 54. It can be understood that the controller 4 refers to an embedded system with data processing capabilities, specifically a microcontroller combined with a pressure control algorithm, to perform pressure data analysis and execute the drive for the volume adjustment component 3.

[0048] During the pumping process of the diaphragm pump, the pressure acquisition device 2 continuously collects pressure data from both the inlet 51 and outlet 52 of the pump body 1 and transmits it to the control device 4. The control device 4 calculates the pressure pulsation amplitude of both the inlet 51 and outlet 52 based on the collected pressure data. When the pressure pulsation amplitude of the inlet 51 and / or the outlet 52 exceeds a preset pressure pulsation amplitude threshold, the control device 4 activates the volume adjustment component 3 and dynamically adjusts the volume of the inlet buffer chamber 53 and / or the outlet buffer chamber 54 to ensure that the pressure pulsation amplitudes of both the inlet 51 and outlet 52 are within their respective pressure pulsation amplitude ranges. For example, when the pressure pulsation amplitude of the inlet 51 exceeds the preset pressure pulsation amplitude threshold, the control device 3 expands the volume of the inlet buffer chamber 53 to enhance the pressure pulsation absorption performance of the inlet 51. In one specific embodiment, the adjustment process can achieve dynamic balancing through a PID algorithm, ensuring that the volume of the buffer chamber always maintains an optimal match with the current pressure pulsation. Therefore, a buffer chamber is introduced beside both the inlet 51 and outlet 52. Through a dynamic adjustment mechanism, the volume of the buffer chamber automatically optimizes according to pressure pulsations in actual operating conditions, significantly reducing the volume of the chamber required to achieve the same buffering performance. Simultaneously, the integrated adjustment component is directly embedded in the pump body 1, avoiding the piping complexity issues associated with an external buffer tank. This achieves real-time suppression of diaphragm pump pressure pulsations, effectively eliminating the impact of flow fluctuations on precision infusion equipment. The dynamic adjustment mechanism ensures stable output across a wide frequency range, while the compact structural design meets the stringent miniaturization requirements of medical equipment. While maintaining the structural integrity of the original pump body 1, the intelligent control system improves pressure stability, resolving the technical contradiction of the traditional buffer device's inability to simultaneously achieve both size and performance.

[0049] See Figure 2 In one embodiment, the volume adjustment assembly 3 includes a motor 31 and a partition 32.

[0050] The motor 31 is provided with a rotating shaft 33 that extends into the inlet buffer chamber 53 or the outlet buffer chamber 54. The motor 31 can be implemented as a stepper motor 31 or a servo motor 31, which is used to provide the torque to drive the rotating shaft 33 to rotate. The rotating shaft 33 refers to the transmission component connecting the motor 31 and the partition 32. Specifically, it can be implemented as a metal shaft or a composite material shaft, and its surface is machined with a threaded structure to convert the rotational motion into linear displacement.

[0051] The partition 32 seals the opening of the inlet buffer chamber 53 away from the inlet port 51 or the opening of the outlet buffer chamber 54 away from the outlet port 52. It is threadedly connected to the rotating shaft 33. When the rotating shaft 33 is driven to rotate by the motor 31, the partition 32 moves closer to or further away from the inlet port 51 within the inlet buffer chamber 53 or closer to or further away from the outlet port 52 within the outlet buffer chamber 54. The partition 32 is a rigid or flexible plate material that seals the opening of the inlet buffer chamber 53 or the opening of the outlet buffer chamber 54. Specifically, it can be made of stainless steel or engineering plastic. The edge of the partition 32 can be fitted with a sealing ring to ensure the airtightness of the cavity. Axial displacement changes the volume of the inlet buffer chamber 53 or the outlet buffer chamber 54. The rotating shaft 33 and the partition 32 can be connected by a trapezoidal thread or a ball screw to convert the rotational motion of the rotating shaft 33 into the linear motion of the partition 32.

[0052] When the pressure pulsation amplitude at the inlet 51 and / or the outlet 52 exceeds a preset pressure pulsation amplitude threshold, the controller 4 activates the motor 31 to drive the rotating shaft 33 to rotate. The threaded structure of the rotating shaft 33 causes the baffle 32 to move axially along the inlet buffer chamber 53 or the outlet buffer chamber 54. For example, when the baffle 32 moves closer to the inlet 51, the volume of the inlet buffer chamber 53 decreases, which can absorb pressure pulsation fluctuations. When the baffle 32 moves away from the outlet 52, the volume of the outlet buffer chamber 54 increases, which can release pressure pulsation fluctuations. By adjusting the position of the baffle 32 in real time, the buffer chamber volume dynamically matches the current pressure pulsation state, thereby balancing fluid pressure fluctuations. Therefore, the volume of the buffer chamber can be directly changed by driving the diaphragm 32 through the motor 31, without the need for additional external devices. Under the same buffering effect, the structure of the pump body 1 is more compact. Compared with pneumatic or hydraulic drive, the threaded transmission structure driven by the motor 31 has higher displacement accuracy and response speed, which can realize rapid compensation for pressure pulsation. It can accurately control the volume of the buffer chamber according to real-time pressure data, effectively suppressing the pressure pulsation caused by the reciprocating motion of the diaphragm 111. The threaded transmission structure achieves linear displacement control in a limited space, avoiding the volume expansion problem caused by traditional buffer devices. The dynamic volume adjustment mechanism can reduce the damage of fluid impact to the structure of the pump body 1, extend the service life of seals and pipelines, and reduce system vibration and noise.

[0053] See Figure 3 In one embodiment, the volume adjustment assembly 3 includes a cylinder 34 and a partition 32.

[0054] The cylinder 34 is equipped with a cylinder shaft 35 that extends into the inlet buffer chamber 53 or the outlet buffer chamber 54. The cylinder 34 can be implemented using a double-acting cylinder 34 or a single-acting cylinder 34. The cylinder shaft 35 is a rigid transmission component connecting the cylinder 34 and the partition plate 32. Specifically, it can be made of stainless steel or aluminum alloy, and the surface can be coated with an anti-corrosion coating to improve durability. The displacement of the cylinder shaft 35 can be controlled by adjusting the air pressure or the air intake.

[0055] The partition 32 seals the opening of the inlet buffer chamber 53 away from the liquid inlet 51 or the opening of the outlet buffer chamber 54 away from the liquid outlet 52, and is connected to the cylinder shaft 35. When the cylinder 34 drives the cylinder shaft 35 to move, the partition 32 moves in the inlet buffer chamber 53 toward or away from the liquid inlet 51 or in the outlet buffer chamber 54 toward or away from the liquid outlet 52.

[0056] When the pressure pulsation amplitude at the inlet 51 or outlet 52 exceeds a set threshold, the controller 4 sends a drive signal to the cylinder 34, adjusting the internal air pressure of the cylinder 34 to cause axial displacement of the cylinder shaft 35. The cylinder shaft 35 drives the baffle 32 to move within the buffer chamber. For example, when it is necessary to increase the volume of the inlet buffer chamber 53, the cylinder shaft 35 pushes the baffle 32 away from the inlet 51, thus increasing the effective volume of the buffer chamber and absorbing more pressure fluctuation energy. This process forms a closed-loop control through real-time pressure data feedback, enabling the buffer chamber volume to dynamically match the pulsation suppression requirements under the current operating conditions. Therefore, the cylinder 34 drive method directly converts air pressure into linear mechanical motion, providing a millisecond-level response speed and eliminating the need for a gear reduction mechanism, effectively avoiding maintenance problems caused by thread wear. Furthermore, the overall structure of the cylinder 34 drive system is more compact; for example, the cylinder 34 can be integrated inside the base 12, saving more installation space compared to the external motor 31 solution. This system enables rapid and precise adjustment of the buffer chamber volume while maintaining the overall compact structure of the diaphragm pump. When excessive pressure pulsation is detected, the buffer chamber volume can be adjusted in a very short time, such as within 0.5 seconds to complete the maximum stroke displacement, thereby promptly offsetting the pressure fluctuation peak. Compared with a fixed-volume buffer chamber solution, this active volume adjustment mechanism improves the pressure pulsation suppression effect while avoiding the flow channel complexity caused by adding multiple buffer chambers.

[0057] See Figure 1 In one embodiment, the pump body 1 includes a pump head 11 and a base 12.

[0058] The pump head 11 houses a diaphragm 111 and a power device 112 that drives the diaphragm 111 to deform. The pump head 11 refers to the housing structure that accommodates the diaphragm 111 and the power device 112. Specifically, it can be made of cast metal or injection molded from engineering plastics. Its internal space is used to arrange the linkage structure between the diaphragm 111 and the power device 112. The diaphragm 111 is a flexible isolation component made of an elastic deformable material, specifically rubber or polytetrafluoroethylene, used to isolate the liquid delivery area from the drive mechanism. The power device 112 is a mechanical device that drives the diaphragm 111 to move periodically. Specifically, it can be a crank-connecting rod mechanism or an electromagnetic drive device, changing the pump chamber volume through reciprocating motion.

[0059] The base 12 is mounted on the side of the pump head 11 where the diaphragm 111 is located. The base 12 and the pump head 11 together form the inlet 51 and the outlet 52. The base 12 has an inlet buffer chamber 53 and an outlet buffer chamber 54. The base 12 refers to the support structure that is installed in conjunction with the pump head 11. Specifically, it can be designed as a block-shaped component with fluid channels. The inlet buffer chamber 53 and the outlet buffer chamber 54 inside the base are connected to the inlet 51 and the outlet 52 respectively through flow channels.

[0060] The pump head 11 and the base 12 can be connected by flanges or bolts to form a sealed assembly, with the diaphragm 111 fixed between them to form a dynamic sealing interface. When the power device 112 drives the diaphragm 111 to reciprocate, liquid enters the inlet buffer chamber 53 through the inlet port 51, is compressed by the pump chamber, and flows from the outlet buffer chamber 54 to the outlet port 52. The buffer chamber inside the base 12 is directly connected to the inlet and outlet channels, and the space of the buffer chamber is changed by the volume adjustment component 3 to absorb pressure fluctuations. This structure integrates the buffer chamber inside the base 12, achieving pressure pulsation suppression without the need for an external buffer device. Therefore, by integrating the base 12 and the pump head 11, the buffer chamber is directly integrated inside the pump body 1. While maintaining the original size of the pump body 1, the pressure pulsation suppression function is achieved, avoiding the space occupation problem caused by external buffer devices. While ensuring the compact structure of the diaphragm pump, the self-balancing function of pressure pulsation is realized. The coordinated design of the internal buffer chamber of the base 12 and the drive mechanism of the pump head 11 allows the pressure buffering function to be directly integrated inside the pump body 1 without the need to add an external buffer topology structure. This effectively solves the problems of volume expansion and pipeline complexity caused by external buffer devices in traditional solutions.

[0061] See also Figures 2 to 3In some embodiments, the base 12 has an inlet channel 55 and an outlet channel 56. The inlet channel 55 connects the inlet port 51 and the inlet buffer chamber 53, and the outlet channel 56 connects the outlet port 52 and the outlet buffer chamber 54. The inlet channel 55 refers to the fluid passage set inside the base 12 to connect the inlet port 51 and the inlet buffer chamber 53. Specifically, it can be implemented using a straight or curved flow channel structure, and the fluid resistance is reduced by optimizing the flow channel cross-sectional area and length. The outlet channel 56 refers to the fluid passage set inside the base 12 to connect the outlet port 52 and the outlet buffer chamber 54. Specifically, it can be implemented using a gradually narrowing or gradually expanding flow channel structure, and the fluid flow rate is controlled by adjusting the flow channel cross-sectional shape. The base 12, as the connection structure between the pump head 11 and the buffer chamber, forms a closed fluid transmission path by integrating the inlet channel 55 and the outlet channel 56, avoiding pressure loss caused by external pipelines.

[0062] The base 12 is mounted on the side of the pump head 11 where the diaphragm 111 is located. Its interior is formed by machining or casting to create an inlet channel 55 and an outlet channel 56. One end of the inlet channel 55 is directly connected to the inlet port 51 of the pump head 11, and the other end extends to the side wall opening of the inlet buffer chamber 53 to form a fluid inlet. One end of the outlet channel 56 is directly connected to the outlet port 52 of the pump head 11, and the other end extends to the side wall opening of the outlet buffer chamber 54 to form a fluid outlet. When the diaphragm 111 reciprocates under the drive of the power device 112, liquid enters the inlet buffer chamber 53 through the inlet channel 55 to complete pressure buffering, and is then transported by the pump body 1 and discharged from the outlet buffer chamber 54 through the outlet channel 56, forming a continuous fluid transport path. Therefore, by integrating the inlet channel 55 and the outlet channel 56 inside the base 12, the fluid transmission path is internalized, effectively shortening the fluid transmission distance and eliminating turbulence at the connection between the external pipeline and the buffer chamber. This achieves optimized integration of the fluid transmission path, allowing the inlet and outlet processes to be completed in a closed loop within the base 12. This reduces the pressure pulsation caused by pipeline connections. The structural design of the inlet channel 55 and the outlet channel 56 further reduces energy loss during fluid flow. At the same time, the integrated structure of the base 12 avoids the space occupation problem caused by external pipelines, making the overall structure of the diaphragm pump more compact.

[0063] In some embodiments, determining the pressure pulsation amplitude of inlet 51 and outlet 52 based on the pressure data of both inlet 51 and outlet 52 includes: determining the average pressure of inlet 51 and outlet 52 based on the pressure data of both inlet 51 and outlet 52; and determining the pressure pulsation amplitude of inlet 51 and outlet 52 based on the pressure data and the average pressure of both inlet 51 and outlet 52.

[0064] The controller 4 continuously acquires pressure data from both the inlet 51 and the outlet 52 at a fixed sampling frequency, for example, 100 times per second. After continuously acquiring pressure data within a set time window, the average pressure value for that time period is calculated using integration or arithmetic mean. Subsequently, the difference between the instantaneous pressure value and the average pressure value at each sampling point is calculated, and the sum of the absolute values ​​between the maximum positive deviation and the maximum negative deviation is extracted as the pressure pulsation amplitude. For example, when the pressure at the inlet 51 is measured to be an average pressure of 1.2 MPa, a maximum instantaneous pressure of 1.35 MPa, and a minimum instantaneous pressure of 1.05 MPa within 0.5 seconds, the pressure pulsation amplitude can be calculated as (1.35 - 1.2) + (1.2 - 1.05) = 0.3 MPa. This calculation process is simultaneously applied to the pressure data at the outlet 52, thereby obtaining a quantitative index of pressure fluctuation at both ports. Therefore, by calculating the pressure pulsation amplitude in real time, a precise control basis is provided for the volume adjustment component 3, so that the buffer chamber volume adjustment amount is matched with the current pressure fluctuation intensity, avoiding insufficient or redundant buffer capacity, realizing dynamic perception and quantitative evaluation of pressure pulsation, providing accurate data support for real-time adjustment of buffer chamber volume, and automatically matching buffer capacity according to actual pressure fluctuation intensity. While ensuring the pressure pulsation suppression effect, it avoids system structure complexity and solves the problem that traditional fixed buffer chambers cannot adapt to changing working conditions.

[0065] In some embodiments, the volume adjustment component 3 dynamically configures the volume of the inlet buffer chamber 53 and / or the volume of the outlet buffer chamber 54 based on the pressure pulsation amplitude, including: when the pressure pulsation amplitude of the inlet 51 exceeds a first pressure pulsation amplitude threshold, calculating a first chamber volume value based on the flow pulsation amplitude of the pump body 1 and the first pressure pulsation amplitude threshold, and controlling the volume adjustment component 3 to configure the volume of the inlet buffer chamber 53 to the first chamber volume value; when the pressure pulsation amplitude of the outlet 52 exceeds a second pressure pulsation amplitude threshold, calculating a second chamber volume value based on the flow pulsation amplitude of the pump body 1 and the second pressure pulsation amplitude threshold, and controlling the volume adjustment component 3 to configure the volume of the outlet buffer chamber 54 to the second chamber volume value.

[0066] The first and second pressure pulsation amplitude thresholds are preset boundary values ​​for the allowable pressure fluctuation range. Specifically, they can be set to 80%-95% of the maximum allowable pressure fluctuation value of the system, serving as the critical condition for triggering buffer chamber volume adjustment. The flow pulsation amplitude refers to the product of the pump body 1's single-stroke displacement and operating frequency, which can be calculated using the pump body 1's structural parameters and speed sensor data. It is used to characterize the intensity of periodic fluctuations during liquid transport. The chamber volume value is the target buffer chamber volume calculated based on the liquid's bulk modulus and safety factor. It can be determined through formula derivation or experimental calibration, and is used to match the buffer chamber volume with the current pressure fluctuation state.

[0067] When the pressure acquisition device 2 detects that the pressure pulsation amplitude at the inlet 51 exceeds the first pressure pulsation amplitude threshold, the controller 4 calculates the required volume of the inlet buffer chamber 53 based on the current operating state of the pump body 1, and drives the actuator in the volume adjustment assembly 3 to move the position of the baffle 32, thereby increasing or decreasing the buffer chamber volume to the target value. For example, when the detected pressure pulsation amplitude at the inlet 51 reaches 1.5 MPa, the formula calculates that the volume of the inlet buffer chamber 53 needs to be adjusted to 50 ml. At this time, the actuator in the volume adjustment assembly 3 drives the baffle 32 to move away from the inlet 51 to expand the buffer chamber volume and absorb pressure fluctuations. The same control logic is synchronously applied to the outlet buffer chamber 54. When the pressure pulsation amplitude at the outlet 52 exceeds the second pressure pulsation amplitude threshold, the volume adjustment assembly 3 changes the volume of the outlet buffer chamber 54. Therefore, by dynamically calculating the target volume and automatically adjusting the size of the buffer chamber, it can adapt to the pulsation suppression requirements under different flow and pressure conditions. It realizes the automatic optimization of the buffer chamber volume according to the real-time pressure fluctuation status, effectively balancing the contradiction between pressure pulsation suppression requirements and equipment compactness. When the pressure pulsation is detected to exceed the safety threshold, the optimal buffer volume can be quickly calculated and adjusted. This avoids the problem of volume redundancy in traditional fixed buffer chambers under low-frequency conditions and insufficient volume under high-frequency conditions. At the same time, it eliminates the complex pipeline layout caused by adding multi-stage buffer structures.

[0068] In a specific embodiment, the formula for calculating the flow pulsation amplitude of pump body 1 is as follows:

[0069] ,

[0070] The formula for calculating the volume of the first cavity is:

[0071] ,

[0072] The formula for calculating the volume of the second cavity is:

[0073] ,

[0074] in, The amplitude of the flow pulsation in pump body 1. This refers to the single-stroke displacement of pump body 1. The operating frequency of pump body 1, Bulk modulus of liquid For safety reasons, This is the volume of the first cavity. This is the volume value of the second cavity. The first pressure pulsation amplitude threshold. This is the threshold value for the second pressure pulsation amplitude.

[0075] The controller 4 acquires real-time pressure data from both the inlet 51 and outlet 52 via the pressure acquisition device 2, and calculates the current fluid fluctuation state based on the flow pulsation amplitude formula. When the pressure pulsation amplitude of the inlet 51 exceeds the first pressure pulsation amplitude threshold, the minimum volume required for the inlet buffer chamber 53 is calculated according to the first chamber volume calculation formula, and the volume adjustment component 3 is driven to move the baffle 32 to the corresponding position to expand the chamber space. For example, when the pump 1 operates at a frequency of 50Hz and a single-stroke displacement of 10mL, the calculated flow pulsation amplitude is 500mL / s. If the pressure pulsation amplitude of the inlet 51 is detected to reach 0.5MPa and the first threshold is set to 0.4MPa, the volume of the inlet buffer chamber 53 is automatically calculated to be adjusted to 120mL. This calculation process is simultaneously applied to the adjustment of the outlet buffer chamber 54, and by dynamically matching the buffer chamber volume with real-time pressure fluctuations, the active suppression of pressure pulsation is achieved. Therefore, by establishing a quantitative mathematical model of the flow pulsation amplitude and the buffer chamber volume, the buffer chamber volume can be automatically calculated and precisely adjusted according to the actual operating state of the pump body 1. For example, when the frequency of the pump body 1 changes or the liquid properties change, the system can still maintain the pressure pulsation suppression effect, avoiding the adjustment lag or overcompensation problems caused by parameter mismatch in traditional methods.

[0076] In some embodiments, the controller 4 is further configured to reduce the operating frequency of the pump body 1 to a preset operating frequency value, and after dynamically configuring the volume of the inlet buffer chamber 53 and / or the volume of the outlet buffer chamber 54, restore the operating frequency of the pump body 1 to the original operating frequency value.

[0077] When the pressure pulsation amplitude at the inlet 51 or outlet 52 exceeds the threshold, the controller 4 first sends a frequency reduction command to the power unit 112 in the pump body 1, for example, reducing the operating frequency from 120 times per minute to 80 times per minute. At this time, the instantaneous flow rate of the pump body 1 decreases, and the fluid inertial impact weakens. Subsequently, the volume adjustment component 3 begins to adjust the position of the baffle 32, for example, increasing the volume of the inlet buffer chamber 53 by 20 cubic centimeters. After the volume adjustment is completed, the controller 4 increases the operating frequency back to the initial value, for example, restoring it to 120 times per minute. At this time, the buffer chamber is capable of absorbing pressure fluctuations under the new operating conditions. Thus, by coordinating the frequency adjustment and volume adjustment, the system energy input is reduced during the buffer chamber structure adjustment process, effectively avoiding secondary pressure shocks caused by volume changes. This maintains system pressure stability during the buffer chamber volume adjustment phase, prevents pressure oscillations caused by sudden volume changes, and ensures a smooth transition of the diaphragm pump under complex operating conditions. This control method is particularly suitable for precision instruments that are sensitive to pressure fluctuations, such as in medical dialysis equipment, where it can effectively ensure stable pressure in infusion lines and avoid the risk of blood cell damage caused by sudden pressure changes.

[0078] In some specific implementations, the frequency reduction operation can be linked with volume adjustment to form a control logic. For example, after detecting excessive pressure pulsation, the control system automatically enters the frequency adjustment mode. After the buffer chamber volume is adjusted and the pressure data returns to the normal range, the frequency recovery program is triggered. In addition, the preset operating frequency value can be set to multiple gradients, such as selecting different levels such as 50% or 70% of the original frequency based on the proportion of pressure pulsation amplitude exceeding the threshold.

[0079] This application also provides a medical device.

[0080] The medical device includes the aforementioned self-balancing pressure pulsation diaphragm pump. The specific structure of the self-balancing pressure pulsation diaphragm pump is as described in the above embodiments. Since the medical device provided in this application adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0081] In summary, the diaphragm pump and medical device with self-balancing pressure pulsation provided in this application introduce buffer chambers on both the inlet and outlet. Through a dynamic adjustment mechanism of the buffer chamber volume, the volume of the buffer chamber is automatically optimized according to the pressure pulsation changes in actual working conditions. This significantly reduces the volume of the chamber required to achieve the same buffering performance. At the same time, the integrated adjustment component is directly embedded in the pump body, avoiding the pipeline complexity problems caused by an external buffer tank. This achieves real-time suppression of diaphragm pump pressure pulsation, effectively eliminating the impact of flow fluctuations on precision infusion equipment. The dynamic adjustment mechanism enables the device to maintain stable output over a wide frequency range. Meanwhile, the compact structural design meets the stringent miniaturization requirements of medical equipment. While maintaining the integrity of the original pump body structure, the intelligent control system improves pressure stability and solves the technical contradiction of the traditional buffer device's inability to achieve both size and performance.

[0082] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0083] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A diaphragm pump capable of self-balancing pressure pulsation, characterized in that, include: The pump body has an inlet, an outlet, an inlet buffer chamber connected to the inlet, and an outlet buffer chamber connected to the outlet. A pressure acquisition device is configured to acquire pressure data from both the inlet and the outlet. A volume adjustment component is movably mounted on the inlet buffer chamber and the outlet buffer chamber, and when it is moved, the volume of the inlet buffer chamber and the volume of the outlet buffer chamber can be dynamically changed. The controller is configured to determine the pressure pulsation amplitude of the inlet and outlet based on the pressure data of both the inlet and the outlet, and to control the volume adjustment component to dynamically configure the volume of the inlet buffer chamber and / or the volume of the outlet buffer chamber based on the pressure pulsation amplitude. The method of dynamically configuring the volume of the inlet buffer chamber and / or the volume of the outlet buffer chamber based on the pressure pulsation amplitude includes: When the pressure pulsation amplitude at the inlet exceeds the first pressure pulsation amplitude threshold, the first cavity volume value is calculated based on the flow pulsation amplitude of the pump body and the first pressure pulsation amplitude threshold, and the volume adjustment component is controlled to configure the volume of the inlet buffer cavity to the first cavity volume value. When the pressure pulsation amplitude at the outlet exceeds the second pressure pulsation amplitude threshold, the second cavity volume value is calculated based on the flow pulsation amplitude of the pump body and the second pressure pulsation amplitude threshold, and the volume adjustment component is controlled to configure the volume of the outlet buffer cavity to the second cavity volume value. The formula for calculating the flow pulsation amplitude of the pump body is: ， The formula for calculating the volume of the first cavity is: ， The formula for calculating the volume of the second cavity is: ， in, This refers to the amplitude of the flow pulsation in the pump body. This refers to the single-stroke displacement of the pump body. The operating frequency of the pump body, Bulk modulus of liquid For safety reasons, This is the volume of the first cavity. This is the volume value of the second cavity. The first pressure pulsation amplitude threshold. This is the threshold value for the second pressure pulsation amplitude.

2. The diaphragm pump with self-balancing pressure pulsation according to claim 1, characterized in that, The volume adjustment component includes: The motor is equipped with a rotating shaft that extends into the inlet buffer cavity or the outlet buffer cavity; A partition seals the opening of the inlet buffer chamber away from the liquid inlet or the opening of the outlet buffer chamber away from the liquid outlet. It is threadedly connected to the rotating shaft. When the motor drives the rotating shaft to rotate, it moves in the inlet buffer chamber toward or away from the liquid inlet or in the outlet buffer chamber toward or away from the liquid outlet.

3. The diaphragm pump capable of self-balancing pressure pulsation according to claim 1, characterized in that, The volume adjustment component includes: A cylinder, provided with a cylinder shaft that extends into the inlet buffer chamber or the outlet buffer chamber; A partition seals the opening of the inlet buffer chamber away from the liquid inlet or the opening of the outlet buffer chamber away from the liquid outlet. It is connected to the cylinder shaft and, when the cylinder drives the cylinder shaft to move, it moves in the inlet buffer chamber toward or away from the liquid inlet or in the outlet buffer chamber toward or away from the liquid outlet.

4. The diaphragm pump capable of self-balancing pressure pulsation according to claim 1, characterized in that, The pump body includes: The pump head contains a diaphragm and a power device that drives the diaphragm to deform. The base is assembled on the side of the pump head where the diaphragm is located, and together with the pump head, it forms the liquid inlet and the liquid outlet, and opens the inlet buffer chamber and the outlet buffer chamber.

5. The diaphragm pump capable of self-balancing pressure pulsation according to claim 4, characterized in that, The base is provided with an inlet channel and an outlet channel. The inlet channel connects the inlet port and the inlet buffer chamber, and the outlet channel connects the outlet port and the outlet buffer chamber.

6. The diaphragm pump capable of self-balancing pressure pulsation according to any one of claims 1 to 5, characterized in that, Determining the pressure pulsation amplitude of the inlet and outlet based on the pressure data of both includes: Based on the pressure data of both the inlet and the outlet, determine the average pressure of both the inlet and the outlet; Based on the pressure data and average pressure of the inlet and outlet, the pressure pulsation amplitude of the inlet and outlet is determined.

7. The diaphragm pump capable of self-balancing pressure pulsation according to any one of claims 1 to 5, characterized in that, The controller is also configured to reduce the operating frequency of the pump body to a preset operating frequency value, and after dynamically configuring the volume of the inlet buffer chamber and / or the volume of the outlet buffer chamber, restore the operating frequency of the pump body to the original operating frequency value.

8. A medical device, characterized in that, Including the diaphragm pump with self-balancing pressure pulsation as described in any one of claims 1 to 7.

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