In 2023, wearable devices were formally included in the Blood Pressure Measurement and Hypertension Diagnosis Process of the Hypertension Prevention and Control Guidelines in China, so high-precision blood pressure meter worn on the hand have become an important direction for the industry's technological development. Currently, wearable devices on the market that comply with international standards for blood pressure detection functions are mainly pressurized by micro air pumps, airbags and other structures to achieve accurate and reliable blood pressure measurement.
Micro air pumps
Micro air pumps are new fluid pumps that use Microfluidics Technology principles to achieve precise control of fluids. With the rapid development of science and technology in recent years, Micro air pumps show the development trend of high back pressure, large flow; miniaturization, low energy consumption and high precision output. At present, Micro air pumps have a variety of structural forms and driving methods, among which Micro Piezo Air Pump has attracted much attention due to their simple structure and outstanding performance advantages. It can be the traditional pump drive source part, transmission part and the pump body into one, simple structure, small size, light weight, fast response; the application of ultrasonic technology, low noise, no electromagnetic interference, low energy consumption; drive voltage is low, and can be applied according to the voltage or frequency to control the output of a small flow rate and accurate air pressure; output torque and so on.
Micro Piezo Air Pump working principle
Micro Piezo Air Pump consists of piezoelectric vibrator, pump valve and pump body, there is no motor, no rotating parts, piezoelectric vibrator for its power drive source, driven by AC power, piezoelectric vibrator radial shortening or elongation under the action of the electric field, and at the same time drive the elastic substrate bending and deformation, so as to change the volume of the pump cavity.Piezoelectric vibrator positive bending (i.e., piezoelectric vibrator elongation), the pump cavity volume increases, the pressure inside the cavity decreases, the gas flows into the pump cavity; when the piezoelectric vibrator reverse bending (i.e., piezoelectric vibrator contraction), the pump cavity volume decreases, the pressure inside the cavity increases, the gas is extruded out of the pump cavity, which results in the formation of a gentle, continuous and continuous directional flow of the gas.
As a high-tech enterprise with more than 20 years of experience in ultrasonic technology, AUDIOWELL has rich experience in mass production of the first generation of Micro Piezo Air Pump and piezo fan and other related technologies. Recently, AUDIOWEL has once again successfully overcome various technical difficulties and developed a new generation of Micro Piezo Air Pump integrating ultrasonic frequency bands, with large flow output and high pressure load.
Ultrasonic frequency band, low noise
The resonance frequency of the Micro Piezo Air Pump is 24.5±2KHz (>20 kHz), which belongs to the ultrasonic frequency band, beyond the range of human ear hearing, and the noise is as low as 40dB or less, so even if the product is worn late at night to start the intelligent detection, it will not affect the rest of others. The product is not easy to electromagnetic interference, stable performance; its piezoelectric vibrator good toughness, good fracture resistance, anti-oxidation performance, high reliability.
High flow output, high pressure load
Micro Piezo Air Pump without motor, no rotating parts, simple structure, only need to adjust the driving voltage or frequency to control the air flow, fast response. If the drive voltage is increased and the air pressure is high, the flow rate is high; the same principle applies in reverse. From the following P-Q characteristic chart, it can be seen that, influenced by the characteristics of large radial vibration of the piezoelectric vibrator, the product output flow rate is large, and the gas flow rate can still maintain a positive output under the pressure load of 40KPa.
Low power consumption to improve the whole machine range
The endurance of some brands of smart watches on the market has not reached the requirements of consumers, and the use of Micro Piezo Air Pump will effectively improve the endurance of the whole machine. Micro Piezo Air Pump with high-performance piezoelectric vibrator as the driving source, high conversion rate between mechanical and electrical energy, the product drive voltage is low, power consumption is as low as 1.5w, which effectively improves the endurance of the whole machine, and it is the right choice for smart wearing blood pressure monitoring.
Small size and light weight
The Micro Piezo Air Pump is small (size: 21x19x3.2mm without nozzle) and lightweight (weight: 3.5g), which is in line with the technological development of wearable devices.
Fast pressure drop for better user experience
After experimental testing, the Micro Piezo Air Pump connected to the 100CC container, from 260mmHg down to 15mmHg time ≤10s. Users are able to quickly release the pressure constraints at the end of the blood pressure test using the wearable device fitted with the product for a better experience.
In the medical field, Micro Piezo Air Pump utilize the characteristics of fast response speed and high control accuracy for the release of micro slow-release agents, including drugs such as insulin or cancer analgesia.
In addition, in the field of negative pressure adsorption, such as in burn medicine, medical aesthetics, or obstetrics and gynecology treatments, Micro Piezo Air Pump can be used to create lightweight electronic dressings that achieve uniform pressure on the skin by achieving uniform pressure on the skin through the simplicity of its air outlet adjustment, pumping out fluid buildup and promoting wound healing.
Consumer Electronics Industry
Notably, in recent years, Micro Piezo Air Pumps have also had a head start in the field of microscopic heat dissipation, which can be used as heat sinks to dissipate heat for electronic devices such as chips, LED and PCB in gaming-type and design-oriented computers.
Micro Piezo Air Pumps can be used in fuel cells, chip-integrated cooling, Micro fluid control systems, micro injection systems, biochemical testing, and drag reduction control.
Canalys released the "Q3 2023 Global Wearable Wristband Device Key Market Vendor Ranking" report shows that the global smart wearable wristband device shipments reached 51 million units in the third quarter, the market from the second quarter of the recovery to a steady upward trend development. The data predicts that the global smart wearable device market will reach about 150 billion dollars in 2026, and the development prospect of wearable device industry is promising.