Low-noise peristaltic pump driver

Abstract

The utility model discloses a low-noise peristaltic pump driver, which relates to the technical field of peristaltic pump noise reduction and comprises a multi-stage vibration reduction system, an inertia tuning mechanism and an intelligent air cooling system. The multi-stage vibration reduction system comprises a motor vibration reduction piece and a vibration reduction column which are used for absorbing high-frequency vibration and low-frequency vibration respectively. According to the inertia tuning mechanism, a flywheel is added on an output shaft of a stepping motor to change the rotational inertia of the motor and eliminate resonance noise; the intelligent air cooling system intelligently starts and stops the fan according to the temperature threshold monitored by the temperature sensor, the running time of the cooling fan is shortened, and the noise is reduced. According to the peristaltic pump driver, noise in the operation process is effectively reduced through the multi-stage vibration reduction system, the inertia tuning mechanism and the intelligent air cooling system, the noise can be reduced to 32-37dB from 45-65dB during low-speed operation, and the peristaltic pump driver is particularly suitable for application scenes such as medical equipment and laboratory instruments which have strict mute requirements.

Description

Technical Field

[0001] This utility model belongs to the field of peristaltic pump noise reduction technology, specifically relating to a low-noise peristaltic pump driver. Background Technology

[0002] In modern laboratory environments, equipment noise levels have become a crucial consideration. To ensure a quiet laboratory environment, the noise level of equipment during operation is typically strictly limited to below 60 decibels (dB). Peristaltic pumps, as widely used liquid transfer devices in laboratories, inevitably generate a certain amount of noise during operation. However, existing peristaltic pump designs still have shortcomings in noise control, especially in laboratory environments with low noise requirements, where noise levels may exceed acceptable levels for users, thus affecting experimental accuracy and laboratory comfort.

[0003] A peristaltic pump mainly consists of two parts: the peristaltic pump driver and the peristaltic pump head. Among them, the peristaltic pump driver is the main source of noise, and its noise generation mechanism is relatively complex, mainly including the following three aspects: first, the resonance noise of the stepper motor; second, the high-frequency resonance noise of the motor bracket; and third, the noise of the cooling fan.

[0004] Existing peristaltic pump designs have significant shortcomings in noise control, especially in laboratory environments where noise levels may exceed acceptable levels for users. Therefore, there is an urgent need for a technical solution that can effectively reduce peristaltic pump noise to meet the requirements of a quiet laboratory environment. Utility Model Content

[0005] Noise has always been a key factor affecting the performance and user experience of peristaltic pump drives. This invention aims to provide a low-noise peristaltic pump drive by employing a series of structural optimizations and intelligent control strategies to reduce noise during operation and improve its stability and applicability under various working conditions.

[0006] To achieve the above objectives, this utility model provides the following solution: a low-noise peristaltic pump driver, comprising:

[0007] A multi-stage vibration reduction system includes motor damping pads installed between the stepper motor and the motor bracket, and multiple damping columns located at the bottom of the motor bracket;

[0008] An inertial tuning mechanism, including a flywheel mounted on the output shaft of a stepper motor, is used to change the rotational inertia of the stepper motor to eliminate resonance noise.

[0009] The intelligent air-cooling system includes a fan, a switching power supply, a drive circuit board, and a temperature sensor mounted on the bottom of the driver. The fan intelligently starts and stops based on the temperature threshold monitored by the temperature sensor.

[0010] As an optional implementation, the motor damping sheet comprises a motor mounting plate, a rubber pad and a bracket mounting plate connected integrally, and the rubber pad is arranged between the motor mounting plate and the bracket mounting plate.

[0011] As an optional implementation, the motor mounting plate and the bracket mounting plate are made of metal, and the hardness of the rubber pad is Shore A 60-70.

[0012] As an optional implementation, the damping column comprises an outer threaded end, an inner threaded end and an intermediate elastic body between the two, and the damping column is threadedly connected between the motor bracket and the driver bottom shell.

[0013] As an optional implementation, the intermediate elastic body is natural rubber, and the hardness is Shore A 45-60.

[0014] As an optional implementation, the mass of the flywheel accounts for 15%-20% of the mass of the motor rotor.

[0015] As an optional implementation, the flywheel is configured to offset the resonance frequency of the stepper motor to above 300 rpm.

[0016] As an optional implementation, the temperature sensor of the intelligent air cooling system is welded in the center of the driving circuit board, for real-time monitoring of the temperature in the driver bottom shell.

[0017] As an optional implementation, the fan start threshold of the intelligent air cooling system is 50 DEG C, and the stop threshold is 48 DEG C.

[0018] The utility model discloses the following technical effects:

[0019] The peristaltic pump driver of the utility model passes through multistage damping system, inertia tuning mechanism and intelligent air cooling system, effectively reduced the noise in the operation process, can reduce the noise from 45-65dB to 32-37dB when low -speed operation, especially suitable for medical equipment, laboratory instrument etc. The application scene of strict quietness requirement. DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment, and obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0021] Figure 1 It is the structural schematic diagram of peristaltic pump drive assembly in the utility model.

[0022] Figure 2 It is the explosion view of the peristaltic pump driving assembly in the utility model;

[0023] Figure 3 It is the structural schematic view of the driver bottom shell in the utility model;

[0024] Figure 4 It is the fan noise reduction working principle block diagram in the utility model.

[0025] In the figure, 1, motor damping piece; 2, stepper motor; 3, motor support; 4, pump head support; 5, damping column; 6, rubber coupling; 7, fan; 8, driver bottom shell; 9, switching power supply; 10, driving circuit board; 11, temperature sensor. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0027] The peristaltic pump driver is the main source of noise, and its noise generation mechanism is relatively complex, mainly including the following three aspects:

[0028] 1. Resonance noise of stepper motor: peristaltic pumps usually use stepper motors as prime movers, because of their low price and easy to accurately control the speed, they are widely used in small peristaltic pumps. However, stepper motors have a significant drawback, that is, resonance phenomenon. The resonance region of the motor is closely related to the moment of inertia of its rotor. When the motor operating frequency approaches the resonance region, the internal structure of the motor will produce strong low-frequency vibration. This vibration will be transmitted to the driver shell or pump head through the motor support, causing it to vibrate and produce significant noise. In some cases, the intensity of this noise may exceed 65 decibels (dB), far exceeding the noise standard of laboratory equipment, thus causing user dissatisfaction.

[0029] 2. High-frequency resonance noise of motor support: when the stepper motor operates at a high speed, the motor support may produce high-frequency resonance. This high-frequency resonance not only causes the motor to operate unstably, but also produces obvious noise. In some cases, only high-frequency resonance noise may exceed 60dB, directly exceeding the noise limit standard of laboratory equipment. The existence of high-frequency resonance noise not only affects the quiet environment of the laboratory, but also may have a negative impact on the precision and stability of the experimental equipment.

[0030] 3. Noise of the heat dissipation fan: Since the peristaltic pump driver generates a high temperature during operation, and its shell is usually close to a sealed state, it is necessary to be equipped with a forced heat dissipation fan to maintain the normal working temperature. However, the heat dissipation fan itself generates significant noise when it is running, and the noise level usually exceeds 43dB. Such noise is particularly prominent in a laboratory environment, especially under low background noise conditions, and the fan 7 noise can become one of the main noise sources, further affecting the quiet environment of the laboratory.

[0031] In summary, the existing peristaltic pump design has obvious deficiencies in noise control, especially in a laboratory environment, and the noise level may exceed the user's acceptable range. Therefore, there is an urgent need for a technical solution that can effectively reduce the noise of the peristaltic pump to meet the laboratory's requirements for a quiet environment.

[0032] The embodiment aims to solve the problems of existing drivers, such as easy resonance of the shell under low-frequency and high-frequency vibration, and excessive noise caused by continuous operation of the heat dissipation fan, and provides a composite damping structure and an intelligent temperature control fan system to significantly reduce the noise of the driver in operation.

[0033] In order to make the above-mentioned purposes, features and advantages of the present utility model more obvious and easy to understand, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0034] Referring to Figures 1 to 4 The embodiment of the present utility model provides a low-noise peristaltic pump driver, which comprises a pump head support 4, a rubber coupling 6 and a motor support 3. The pump head support 4 is used for installing the peristaltic pump head, the rubber coupling 6 is used for driving the peristaltic pump head to operate, and the motor support 3 is used for installing the stepping motor 2. The above-mentioned three components are prior art and will not be described here. The low-noise peristaltic pump driver of the embodiment further comprises a multi-stage damping system, an inertia tuning mechanism and an intelligent air cooling system.

[0035] The multi-stage damping system comprises a high-frequency damping module and a low-frequency damping module. The high-frequency damping module is specifically a motor damping sheet 1 installed between the stepping motor 2 and the motor support 3, and the low-frequency damping module is specifically four damping columns 5 arranged at the bottom of the motor support 3 and in contact with the bottom shell 8 of the driver.

[0036] The motor damping sheet 1 is composed of a motor mounting plate, a rubber pad and a support mounting plate, and is used for absorbing high-frequency vibration. The motor is fixed on the motor mounting plate by bolts, the motor mounting plate is bonded with the rubber pad, the rubber pad is bonded with the support mounting plate, and finally the support mounting plate is fixed on the motor support 3 by bolts. Among them, the relatively hard rubber pad can absorb higher frequency vibration, and the higher strength and rigidity can well support the weight of the motor. The rubber of the motor damping sheet 1 cannot be designed too soft, otherwise the strength is too poor and cannot effectively support the weight of the motor, causing the risk of motor falling off.

[0037] In one embodiment, the hardness of the rubber pad is Shore A 60-70. This relatively hard rubber can absorb high-frequency vibrations while providing sufficient strength and rigidity to support the weight of the motor, avoiding the risk of the motor falling off due to excessively soft rubber.

[0038] In one embodiment, the motor mounting plate and the bracket mounting plate can both be made of a metal plate with a thickness of 3 mm, such as an alloy plate or a steel plate.

[0039] The motor damping sheet 1 of the above structure can effectively attenuate high-frequency vibration noise above 500 Hz.

[0040] The damping column 5 is provided at the bottom of the motor bracket 3 and adopts an external thread at one end and an internal thread at the other end. The external thread end is connected to the threaded hole at the bottom of the motor bracket 3, and the internal thread end is connected to the threaded hole on the bottom shell 8 of the metal driver.

[0041] The damping column 5 of the above structure can absorb low-frequency vibrations of the motor, avoiding shell resonance caused by low-frequency vibrations of the motor, especially when the motor operates at a speed of 200 rpm or less, the damping effect is remarkable.

[0042] Further optimization, on the basis of the above structure, the embodiment also includes an inertia tuning mechanism, which is specifically a flywheel added to the output shaft of the stepper motor 2. The function is to change the moment of inertia of the motor, thereby changing the resonance zone, so that low-speed operation will not produce low-frequency resonance noise.

[0043] In some embodiments, the mass of the flywheel accounts for 15-20% of the mass of the motor rotor. By increasing the moment of inertia of the system, the resonance zone is shifted to the non-working frequency band (the original 50-150 rpm resonance zone is shifted to above 300 rpm), eliminating the low-frequency humming sound when running at low speed.

[0044] Further optimization, on the basis of the above structure, the embodiment also includes an inertia tuning mechanism, which is specifically a flywheel added to the output shaft of the stepper motor 2. The function is to change the moment of inertia of the motor, thereby changing the resonance zone, so that low-speed operation will not produce low-frequency resonance noise.

[0045] The fan 7 start threshold A is set to 50℃, and the stop threshold B is set to 48℃. The start threshold A is greater than the stop threshold B, so as to avoid frequent start and stop of the fan 7. Based on the start threshold and the stop threshold, the working process of the intelligent air cooling system is as follows:

[0046] When the temperature inside the shell is lower than 50℃, the fan 7 will not start.

[0047] With the operation of the motor, if the external environment temperature is high (such as higher than 40℃), the temperature inside the shell rises by more than 10℃, and the temperature detected by the temperature sensor 11 is higher than 50℃, the fan 7 obtains a start signal and starts to exhaust and cool.

[0048] When the temperature inside the shell is reduced to 48℃, the fan 7 stops running.

[0049] In most working conditions, the external environment temperature is low and the motor load is small, the temperature inside the shell generally rises by less than 10℃, and the temperature is lower than 50℃, so the fan 7 will not start. Only when the external environment temperature is high and the driver load is large and continuously works, the fan 7 will start to dissipate heat.

[0050] Through the above structure optimization, the noise of the peristaltic pump driver during low-speed operation (lower than 300rpm) can be reduced from 45-65dB to 32-37dB. The intelligent control strategy of the fan 7 reduces the running time of the fan 7 in most working conditions, and reduces the noise caused by the fan 7.

[0051] The embodiment of the utility model realizes the full working condition noise control through the three technical paths of frequency division damping shock absorption (high frequency / low frequency separation processing)+active thermal management (intelligent start-stop control)+mechanical tuning (flywheel inertia correction). It is especially suitable for medical devices, laboratory instruments and other application scenarios with strict silence requirements.

[0052] The utility model does not exhaust the place for the conventional technical means known to those skilled in the art.

[0053] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0054] The above-described embodiments are merely preferred modes of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application as defined by the claims.

Claims

1. A low noise peristaltic pump driver, characterized by, The application relates to a multi-stage damping system, an inertia tuning mechanism and an intelligent air cooling system. The multi-stage damping system comprises a motor damping sheet (1) installed between a stepping motor (2) and a motor support (3) and a plurality of damping columns (5) arranged at the bottom of the motor support (3). The inertia tuning mechanism comprises a flywheel arranged on the output shaft of the stepping motor (2) and used for changing the rotational inertia of the stepping motor (2) to eliminate resonance noise. The intelligent air cooling system comprises a fan (7), a switching power supply (9), a driving circuit board (10) and a temperature sensor (11) arranged on the bottom shell (8) of the driver.

2. The low noise peristaltic pump driver of claim 1, wherein, The motor damping sheet (1) comprises a motor mounting plate, a rubber pad and a support mounting plate which are integrally connected, and the rubber pad is arranged between the motor mounting plate and the support mounting plate.

3. The low noise peristaltic pump driver of claim 2, wherein, The motor mounting plate and the support mounting plate are made of metal, and the hardness of the rubber pad is Shore A 60-70.

4. The low noise peristaltic pump driver of claim 1, wherein, The damping column (5) comprises an outer threaded end, an inner threaded end and an intermediate elastic body located between the two ends, and the damping column (5) is threadedly connected between the motor support (3) and the bottom shell (8) of the driver.

5. The low noise peristaltic pump driver of claim 4, wherein, The intermediate elastic body is made of natural rubber and has a hardness of Shore A 45-60.

6. The low noise peristaltic pump driver of claim 1, wherein, The mass of the flywheel accounts for 15%-20% of the mass of the motor rotor.

7. The low noise peristaltic pump driver of claim 6, wherein, The flywheel is configured to offset the resonance frequency of the stepping motor (2) to above 300 rpm.

8. The low noise peristaltic pump driver of claim 1, wherein, The temperature sensor (11) of the intelligent air cooling system is welded in the center of the driving circuit board (10) and is used for monitoring the temperature in the bottom shell (8) of the driver in real time.

9. The low noise peristaltic pump driver of claim 1 or 8, wherein, The starting threshold of the fan (7) of the intelligent air cooling system is 50 DEG C, and the stopping threshold is 48 DEG C.

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