72 results about "Piezoelectric pump" patented technology

The invention relates to the technical field of communication, in particular to an adjusting method, device and equipment for the driving frequency of a piezoelectric pump and a computer readable storage medium. The method comprises the following steps: starting from an initial driving frequency, adjusting the driving frequency of the piezoelectric pump according to a first adjustment step length, determining the input power when the piezoelectric pump is driven after each frequency adjustment, and stopping until the input power exceeds a coarse screening threshold value; starting from the driving frequency corresponding to the interruption, adjusting the driving frequency of the piezoelectric pump according to a second adjustment step length, and determining the input power when the piezoelectric pump is driven after each frequency adjustment until the input power corresponding to the adjusted driving frequency is smaller than the input power corresponding to the driving frequency before adjustment after any time of adjustment; wherein the second adjustment step length is smaller than the first adjustment step length; and determining the driving frequency before any adjustment as a target driving frequency, and driving the piezoelectric pump at the target driving frequency.

The piezoelectric pump comprises a shell, a metal substrate and a piezoelectric ceramic actuator, and the shell is provided with a fluid inlet and a fluid outlet; the fluid inlet is provided with a first reverse resistance structure, and the fluid outlet is provided with a second reverse resistance structure.

The invention discloses a drug-coated prostate balloon dilatation catheter control system, relates to the technical field of medical instruments, and aims to solve the technical problems of uncontrollable drug release, extensive dilatation process and lack of quantitative evaluation in existing drug balloon therapy. The system integrates a high-precision pressure sensing module, a micro piezoelectric pump control module, a man-machine interaction module and a data processing module. The system carries out real-time closed-loop control on the internal pressure of the balloon through a self-adaptive PID algorithm, and precise execution of a preset pressure curve is achieved. The innovation of the method lies in that a drug release quantitative estimation model based on pressure-time integration (AUC) is created for the first time, the model can calculate and display the estimated drug release amount in the treatment process in real time, and physical operation parameters are directly associated with biological effects; the device has the effects of realizing accurate and constant control of the dilatation pressure and improving the operation safety.

This application provides a triboelectric self-sensing piezoelectric pump for drug delivery, a flow monitoring device, and a method, relating to the field of fluid transport and flow monitoring. A first friction part of a triboelectric sensor is disposed on an actuating component, and a second friction part is disposed on the inner wall of the pump body. When the actuating component vibrates to control the change in pump chamber volume, driving liquid to flow out through the inlet channel and pump chamber from the outlet channel, the first friction part passively follows the actuating component in synchronous vibration, synchronously changing the gap between the first and second friction parts. An electrical signal corresponding to the vibration of the actuating component is output from the second friction part, and this electrical signal can be calibrated as the corresponding liquid flow rate. This enables long-term, continuous, and accurate flow monitoring of wearable piezoelectric pumps, thereby improving the drug delivery safety and control accuracy of wearable piezoelectric pumps used in medical applications.

The invention relates to the technical field of piezoelectric pumps, in particular to a high-output-performance micro piezoelectric pump which comprises a pump body, an ultrasonic actuator which is arranged in the pump body and divides a pump cavity into a first cavity and a second cavity, and a first air inlet channel, a first air outlet channel, a second air inlet channel and a second air outlet channel which communicate with the two cavities correspondingly. A series connection piece is arranged between the first air outlet channel and the second air inlet channel, so that the two cavities are connected in series to improve the output pressure; or a parallel connecting piece is arranged between the first air outlet channel and the second air outlet channel, so that the two cavities are connected in parallel to improve the output flow. The double independent cavities are arranged in the single pump body and matched with a selectable series-parallel connection structure, so that the output pressure or flow of the pump is increased under the condition that the overall size is not increased, the miniaturization design of products is facilitated, meanwhile, the flow channel resistance is reduced, and the transmission efficiency is improved.

Improved respirator fit test devices including piezoelectric pumps that reduce noise and vibration of the device. The devices may include two or more piezoelectric pumps, wherein a first pump moves sheath air through a differential mobility analyzer and a second pump alternately moves aerosol from inside or outside a respirator through the differential mobility analyzer. A size selected portion of each aerosol sample is then moved through a condensation nuclei counter. Control circuitry enables user selection of a respirator type to be tested, wherein the differential mobility analyzer may be enabled or disabled based on the user selection. The control circuitry further enables calculation of a fit factor corresponding to a quantitative effectiveness of the respirator fitting a user based on signals from the condensation nuclei counter for each aerosol sample.

The invention provides an airflow heat dissipation device of a micro piezoelectric pump, and relates to the technical field of micro electro mechanical systems. An inlet runner arranged on the lower end face of a flow guide part and an outlet runner arranged on the upper end face of the flow guide part are both communicated with a flow guide channel arranged on the flow guide part, and the cross sectional area of the outlet runner is gradually reduced in the direction from the first end to the second end of the outlet runner. The PZT piezoelectric layer is arranged on the upper end face of the flow guide part and provided with a pump film corresponding to the flow guide channel, and the first electrode can drive the pump film to move up and down. The airflow heat dissipation device of the micro piezoelectric pump is suitable for heat dissipation operation of micro components and large-scale integrated circuit systems, and ensures that the temperature of the components and the operating environment of the systems is stable.

The invention relates to a piezoelectric wafer pump, and belongs to the technical field of piezoelectric pumps, the piezoelectric wafer pump comprises a piezoelectric actuator and a plurality of groups of double-cavity diaphragm pumps driven by the piezoelectric actuator, the piezoelectric actuator comprises a comb finger type resonator, a bolt connector and a screw connector, the comb finger type resonator comprises a cross beam and a plurality of driving arms distributed on the top surface of the cross beam at equal intervals, the bolt connector is arranged on the driving arm located on the outermost side, and the screw connector is arranged on the driving arm located on the inner side. The double-cavity diaphragm pump is positioned between two adjacent driving arms and is suspended above the top surface of the cross beam; piezoelectric patches are horizontally arranged on the top face and the bottom face of the cross beam and the bottom ends of the two side faces of the driving arm in pairs, and all the piezoelectric patches are connected in series or in parallel. The comb finger type driver is adopted to drive the multiple sets of double-cavity diaphragm pumps, only one driving power source is needed, the complexity and the control requirement of the driving power source needed by the multi-pump-body resonant piezoelectric pump can be effectively lowered, and the output performance and the working reliability are improved.

An implantable fluid-operated device includes a rechargeable battery, a non-rechargeable battery, at least one capacitor, and a first piezoelectric pump for transferring fluid from the fluid reservoir to the inflatable member. A waveform of electrical energy is provided from the rechargeable battery to a piezoelectric element of the first piezoelectric pump to drive the first piezoelectric pump to pump fluid from the fluid reservoir to the inflatable member. The at least one capacitor is charged in response to a voltage generated by the piezoelectric element when the piezoelectric element returns to its neutral shape from a deformed shape. The provision of electrical energy to different groups of electrical circuits in the devices is controlled based on a state of charge of, for example, the at least one capacitor and the rechargeable battery.

This application discloses a piezoelectric pump, a gas circulation mechanism, and a circulation device. The circulation device includes a piezoelectric pump or a gas circulation mechanism. The piezoelectric pump includes at least one set of sub-pumps. Each sub-pump includes a housing and a vibration assembly. The housing includes a receiving cavity, at least one air inlet channel, and at least one combined air outlet channel communicating with the receiving cavity. The receiving cavity is connected to an external space through the air inlet channel and the combined air outlet channel. A dispersion structure is provided on the cavity wall of the receiving cavity. The vibration assembly is disposed in the receiving cavity, and the dispersion structure is used to disperse the reflected airflow from the cavity wall of the receiving cavity when the vibration assembly vibrates. The piezoelectric pump in this application can reduce operating noise and its own size, thereby meeting the user's dual requirements for quiet operation and lightweight design when using the circulation device.

The application discloses a multi-cavity disc type piezoelectric gas pump which is combined by a multi-cavity disc type piezoelectric gas pump assembly, wherein the assembly comprises a partition plate, an upper pump body, a piezoelectric vibrator, a lower pump body and a one-way valve sheet; the upper pump body is the same as or opposite to the lower pump body; the piezoelectric vibrator divides the upper and lower pump bodies into two cavities; each cavity is provided with an outlet vent and an inlet vent; the quadrant holes of the pump body are communicated through the vent flow channels; after assembly, the quadrant holes of the pump body form a gas inlet and outlet channel; the first and second vent flow channels are arranged at an angle of 90 degrees and are communicated with two adjacent quadrant holes respectively; during assembly, the angle of the upper and lower pump bodies is adjusted, the partition plate is used to open and close the gas channel formed by the quadrant holes of the pump body, and various multi-cavity disc type piezoelectric gas pumps in series connection, parallel connection or series-parallel connection are assembled; the gas outlet and the gas inlet can be converted with each other; the vent is provided with a skirt structure which can isolate and separate the high-pressure area and the low-pressure area, thereby improving the flow of the product.

A piezoelectric pump, for causing the flow of a liquid, including a piezoelectric member driven by applying a voltage, a diaphragm which is deformed by the driving of the piezoelectric member, an adhesive member which bonds the piezoelectric member and the diaphragm together, and an urging member that urges the piezoelectric member toward the diaphragm.

The invention discloses a two-phase liquid cooling device and method based on a diamond copper micro-channel and piezoelectric atomization, the device comprises a chip assembly, a phase change cavity assembly, a heat conduction assembly and a jet flow assembly, the chip assembly comprises a high-power chip and a thermal interface material layer; the phase change cavity assembly comprises a heat dissipation substrate and a sealing cover, and a phase change cavity is defined by the heat dissipation substrate and the sealing cover. The heat conduction assembly comprises a diamond copper composite material compact layer and a diamond copper composite material porous layer. The jet flow assembly comprises a nozzle, a liquid storage tank, a piezoelectric pump, a piezoelectric drive and controller and a radiator. The heat conductivity coefficient, boiling stability, device integration and device compatibility of the two-phase liquid cooling device are improved.

A mixed-fluid delivery device includes a piezoelectric pump that includes a piezoelectric vibrator having a piezoelectric element and a vibrating plate and a pump cabinet and discharges a fluid, and a case body including a pump housing chamber, a liquid reservoir portion, a mixing portion that generates a mixed fluid, a nozzle portion through which the gas discharged from the piezoelectric pump is ejected to the mixing portion, and a conducting portion that conducts a liquid toward the mixing portion. The case body has a reflux path through which a residual liquid that remains in the mixing portion without being delivered to the outside is returned to the liquid reservoir portion. The reflux path is provided so as to be in contact with at least a portion of the pump cabinet.

The invention discloses an adsorption device and an adsorption method of the adsorption device, and relates to the technical field of workpiece adsorption. The adsorption device comprises: a valved piezoelectric pump; a valveless piezoelectric pump; the adsorption part is provided with a workpiece adsorption opening and a vacuum chamber which are communicated; the first air suction port and the second air suction port can be communicated with the vacuum chamber respectively and can be used for vacuumizing the vacuum chamber respectively or jointly; the first air path control unit is arranged at a communication node of the first air suction port, the vacuum chamber and the atmosphere and can enable the vacuum chamber to be selectively communicated with the first air suction port or the atmosphere; and the second air path control unit is arranged at a communication node of the second air suction port, the vacuum chamber and the atmosphere, and can enable the vacuum chamber to be selectively communicated with the second air suction port or the atmosphere or the closed pipeline. The adsorption device is used for avoiding the defects of a valveless piezoelectric pump and a valveless piezoelectric pump, and the vacuum degree of the vacuum chamber is ensured while the negative pressure environment is rapidly established.

The invention discloses a control method and device for an electric breast pump and the electric breast pump, and the control method applied to the electric breast pump comprises the steps: responding to a first mode instruction, controlling a vacuum pump to operate so as to reduce the air pressure of an inner cavity of a breast suction cover, and monitoring the real-time air pressure value of the inner cavity; when the real-time air pressure value reaches a first target air pressure threshold value, a working mode instruction input by a user is obtained, and the working mode instruction comprises a working mode identifier; when the working mode identifier corresponds to a second working mode, the vacuum pump is controlled to stop running, and the piezoelectric pump is started to run in a first preset mode; and when the working mode identifier corresponds to a third working mode, the vacuum pump and the piezoelectric pump are controlled to operate according to a preset cooperative mode. By the adoption of heterogeneous combination of the vacuum pump and the piezoelectric pump and dynamic switching logic based on the negative pressure threshold value, efficient pressure building, powerful suction and mute operation of the breast pump can be achieved at the same time.

1. Name of the designed product: piezoelectric air pump (6). 2. Use of the designed product: for conveying air. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: design 1 perspective view 1. 5. Design 1 is designated as the basic design.

The snore stopping pillow comprises a pillow inner, an electric appliance box is installed on the rear side in the pillow inner, a power source main board, a piezoelectric pump control board, a piezoelectric pump, a first electromagnetic valve, a second electromagnetic valve, a first noise filtering valve, a second noise filtering valve and a power source board are installed in the electric appliance box, and a brain air bag is installed on the middle side in the pillow inner. A neck air bag is installed on the front side in the pillow inner, and an induction belt electrically connected with the power source main board is arranged below the neck air bag. The system is stable in operation, inflation and deflation of the brain air bag are controlled by the first electromagnetic valve and the first noise filter valve, inflation and deflation of the neck air bag are controlled by the second electromagnetic valve and the second noise filter valve, the induction belt captures weak physiological signal changes of the human body in real time, and then physical intervention of the human body is conducted according to detected signal feedback; the air bag is controlled to be inflated or deflated to lift the neck of the human body, the purpose of reducing snoring through auxiliary treatment is achieved, working noise is low, and consumer experience is good.

An implantable device (100) includes a battery (108D), a fluid reservoir (102), an inflatable member (104), a piezoelectric pump (106A), driver circuitry (108E), and a processor (108A). The battery is configured to store electrical energy. The inflatable member is configured to receive fluid to place the inflatable member in an inflated configuration. The piezoelectric pump is configured to pump fluid from the inflatable member to the fluid reservoir. The driver circuitry is configured to provide a waveform of electrical energy to drive the piezoelectric pump to pump fluid from the inflatable member to the fluid reservoir. The processor is configured to, based on a fluid pressure detected within the inflatable member, cause the driver circuitry to provide a waveform of electrical energy from the battery to the piezoelectric pump to cause the piezoelectric pump to pump fluid from the inflatable member to the fluid reservoir.

This invention discloses a piezoelectric pump and a heat dissipation circulation system. The piezoelectric pump includes a valve seat, a valve body assembly, an excitation assembly, and a pressure regulating assembly. The valve seat has a spaced inlet and an outlet. The valve body assembly is stacked with the valve seat and forms a unidirectional liquid channel, the outlet of which is connected to the outlet. The excitation assembly is located on the side of the valve body assembly opposite to the valve seat and forms a pump chamber therewith. The pressure regulating assembly is sandwiched between the valve body assembly and the valve seat and has a pressure regulating chamber that connects the inlet and the inlet of the liquid channel. The excitation assembly drives liquid to enter through the inlet, and through the pressure regulating chamber, the liquid channel, and the pump chamber, flows out through the outlet. The volume change trend of the pressure regulating chamber is opposite to that of the pump chamber. The piezoelectric pump of this invention has a compact structure, which can effectively reduce the space occupied and is beneficial to the miniaturization of the heat dissipation circulation system.

The invention belongs to the field of chip heat dissipation, and particularly relates to a piezoelectric falling film circulation heat dissipation device which comprises a closed cavity, a heat removal face is arranged on the outer side of the closed cavity, a falling film evaporation boiling face, a liquid working medium, a piezoelectric pump, a liquid top box and a condensation face are arranged on the inner side of the closed cavity, and the falling film evaporation boiling face is of a metal porous structure; the liquid working medium forms a liquid pool in the closed cavity, the piezoelectric pump is fixed to the bottom face of the liquid pool, all of a liquid inlet pipeline and a part of a liquid outlet pipeline of the piezoelectric pump are immersed in the liquid pool, the liquid outlet pipeline of the piezoelectric pump is further communicated with a liquid inlet of the liquid top box, and a liquid outlet of the liquid top box is tightly attached to the top of the falling film evaporation boiling face. And the liquid working medium can uniformly flow to the falling film evaporation boiling surface. According to the invention, the heat transfer resistance can be reduced, the heat extraction capability is improved, the heat dissipation power is improved by more than 50% compared with that of a traditional radiator under the same volume and weight, and the heat dissipation requirements of high-power and high-power-density chips of a numerical control system can be met.

The techniques described herein relate to a method of controlling fluid flow between a fluid reservoir and an inflatable member in an implantable fluid-operated device. The method includes: providing a first waveform of electrical energy from a battery of the device to a piezoelectric pump of the device to drive the piezoelectric pump to repeatedly change a volume of a fluid chamber in the pump by a first amount, AVI. a number of times to pump fluid from the fluid reservoir to the inflatable member; and determining a first fluid pressure in the inflatable member based on the first amount of the change of the volume of the fluid chamber and the number of times the volume is changed.

Techniques are disclosed for controlling fluid flow between a fluid reservoir and an inflatable member in an implantable fluid-operated device. Energy received from an external power transmission device is provided to charge a rechargeable battery of the implantable fluid-operated device. A waveform of electrical energy from the rechargeable battery is provided to a first piezoelectric element of a first piezoelectric pump of the implantable fluid-operated device to drive the first piezoelectric element to pump fluid from the fluid reservoir to the inflatable member. At least one capacitor of the implantable fluid-operated device is charged in response to a voltage generated by the first piezoelectric element when the first piezoelectric element returns to its neutral shape from a deformed shape. And the rechargeable battery is prevented from being charged based on the voltage generated by the first piezoelectric element.

The present invention relates to a miniature integrated piezoelectric pump device, comprising a pump body, a valve body, and a bottom substrate, wherein a hollow vibration cavity is provided inside the pump body; the valve body is mounted below the pump body, and comprises a first fixing layer, an elastic film layer, a second fixing layer and a side wall portion assembled from top to bottom; one of the first fixing layer and the elastic film layer is provided with a normally closed hole; when the pump body is in a first working state, the other one of the first fixing layer and the elastic film layer covers the normally closed hole, and the vibration cavity is not in communication with the inside of the side wall portion; when the pump body is in a second working state, the second fixing layer abuts against the elastic film layer, the other one of the first fixing layer and the elastic film layer leaves the normally closed hole, and the vibration cavity is in communication with the inside of the side wall portion; and the bottom substrate serves as a bottom plate and is fixed to the bottom of the side wall portion, and can supply power to and control the pump body. Compared with the prior art, the miniature integrated piezoelectric pump device of the present invention can reduce fluid leakage.

The invention discloses a piezoelectric pump with integrated inlet and outlet double passive valves, which belongs to the technical field of valved piezoelectric pumps and comprises a piezoelectric vibrator, the integrated inlet and outlet passive valves, a pump body, a lower outlet structure and an inlet structure. The piezoelectric vibrator and the pump body are fixedly connected in a sealed mode to form a pump cavity. An inlet structure and a lower outlet structure are arranged on the pump body; the inlet structure comprises a plurality of inlet runner units which are inwards communicated with the interior of the cavity; the integrated inlet and outlet passive valve comprises a double-layer outlet valve plate, a connecting arm and an inlet double-arc straightable valve plate; the double-layer outlet valve plate and the lower outlet structure are arranged in a sliding mode, and when the piezoelectric vibrator vibrates upwards, the piezoelectric vibrator moves upwards to seal a lower outlet. The inlet double-arc-shaped valve plate capable of being straightened comprises an inner arc-shaped valve plate and an outer arc-shaped valve plate which are integrally connected; the outermost side of the outer arc-shaped valve plate is fixedly connected with the outer end of the inlet runner unit; the outer arc-shaped valve plate is completely attached to the arc-surface stop groove of the inlet flow channel unit before being deformed under stress, and the inlet flow channel unit is sealed.

The invention belongs to the field of Mars in-situ resource utilization, and provides a bionic wind power and photovoltaic hybrid power generation tree system suitable for a Mars environment in order to solve the problem that an existing Mars power generation technology is prone to being affected by sand and dust coverage, day and night limitation and a low-atmospheric-density environment. The system comprises a branch part which is arranged at the top of a trunk main body according to a multi-level bifurcation extension form to form a bionic tree-shaped structure main body of a tree-shaped structure, adjacent branches are connected through a drivable rotating shaft, and the included angle between the branches is adjusted to optimize the windward posture; the bionic wind power generation blades integrated on the branches and the photovoltaic power generation layer covering the surface of the structure form a multi-mode power generation unit; the surface of the structure is covered with a super-hydrophobic / super-dust-removing coating, and a piezoelectric pump and a thermal management system are arranged in the structure to form an environment adaptation and self-protection module. A built-in storage battery and a controller form an energy management and storage system. The device can adapt to the atmosphere environment with strong abrasion and low density of Mars, and energy complementation and long-term stable power generation are achieved.

The centering device for the ship mooring rope comprises a base and a pair of guide wheels, a plurality of spray holes are evenly formed in the surfaces of the guide wheels, the interior of each guide wheel is hollow to form a through hole communicated with the spray holes, a base is installed below the guide wheels, a hollow shaft rod penetrates through the base and is rotationally connected with the interior of the base, and the hollow shaft rod is fixedly connected with the base. The hollow shaft rod is coaxially connected with the guide wheel, the lower portion of the hollow shaft rod is connected with flow dividing pipes through a rotary connector, the two flow dividing pipes are communicated through a T-shaped pipe, and the T-shaped pipe is communicated with a water tank storing cleaning liquid for dissolving salinization through a piezoelectric pump and a hard pipe. The guide wheel is communicated with the water tank, so that the guide wheel not only can limit and guide the mooring rope, but also can spray cleaning liquid to the surface of the mooring rope during rotation to dissolve salt crystals on the surface of the mooring rope, corrosion of the salt crystals to the mooring rope is effectively slowed down, and abrasion of the mooring rope to the guide wheel can be reduced.

This disclosure provides a dual-drive breast pump and its control method, relating to the field of maternal and infant product technology. The dual-drive breast pump includes a main controller, a first drive module, and a second drive module. The first drive module is electrically connected to the main controller and is directly or indirectly connected to the negative pressure chamber of the breast pump body through an air path. The first drive module can generate an adjustable first negative pressure relative to the negative pressure chamber. The second drive module is electrically connected to the main controller and connected in series with the first drive module. The second drive module is directly or indirectly connected to the negative pressure chamber and can generate a second negative pressure. The first and second drive modules can be independently controlled, forming two first control closed loops. At least one of the first and second drive modules can achieve frequency tracking by adjusting the drive frequency. This disclosure, through the independent frequency tracking control of the first and second drive modules, can adjust the drive frequency in real time to match the resonant state of the piezoelectric pump.