62 results about "Public supply" patented technology

A liquid ejection apparatus of the invention includes a liquid storage container that stores liquid, a plurality of print element boards including an ejection opening that ejects liquid and a pressure chamber that includes a print element generating energy for ejecting liquid therein, a common supply passage that supplies liquid to the plurality of print element boards, a supply-side filter provided in a passage between the liquid storage container and the common supply passage to remove a foreign substance from liquid, and a supply-side pressure adjustment mechanism provided in a passage at a downstream side of the common supply passage to adjust a pressure in the common supply passage.

The invention relates to a railway streetlamp for generating power by utilizing a flywheel battery and suction force and a use method thereof. The railway streetlamp and the use method are characterized in that each streetlamp at the two sides of the railway is additionally provided with a swinging device adopting the suction force as power; when a high-speed train passes, each swinging device swings due to action of the suction force; the swinging force enables a flywheel generating device to store energy and generate power simultaneously; the generated power is stored in one flywheel battery; and at night, a control circuit sends a message, and the flywheel battery supplies power to the streetlamps at the two sides of the railway to emit light for illumination. The railway streetlamp and the use method have the beneficial effects that the suction force generated when the high-speed train runs is utilized for generating power so as to provide stable and environmentally-friendly power for illumination of the railway streetlamp; the defect of unstable power of wind-energy and solar streetlamps is avoided; the power resource of a public supply network is also saved; since the energy for generating power is stored by utilizing the flywheel battery to replace the power stored by a chemical storage battery, the environmental pollution of the chemical battery is avoided, and the defects that the chemical battery is short in service life and needs to be maintained frequently are also avoided.

A liquid ejection apparatus of the invention includes a liquid storage container that stores liquid, a plurality of print element boards including an ejection opening that ejects liquid and a pressure chamber that includes a print element generating energy for ejecting liquid therein, a common supply passage that supplies liquid to the plurality of print element boards, a supply-side filter provided in a passage between the liquid storage container and the common supply passage to remove a foreign substance from liquid, and a supply-side pressure adjustment mechanism provided in a passage at a downstream side of the common supply passage to adjust a pressure in the common supply passage.

An object of the present invention is to provide an ink jet head and the like that are small, are capable of achieving a higher resolution, increasing ejection stability, and lowering production costs, and include flow paths capable of circulating ink. An ink jet head of the present invention includes: a head chip including nozzles, pressure chambers that communicate with the respective nozzles, piezoelectric elements that correspond to the respective pressure chambers, discrete circulation flow paths that branch from ink flow paths extending from inlets of the pressure chambers to outlets of the nozzles and are capable of discharging the ink in the pressure chambers, and a common circulation flow path with which at least two of the discrete circulation flow paths communicate; and a common supply liquid chamber that is provided on the upper surface of the head chip, and stores the ink to be commonly supplied to the respective pressure chambers through ink supply holes formed in the upper surface of the head chip.

The invention provides a water pump power generation system in a pumping station and a control method. The system comprises a plurality of water pump motors, a plurality of water pumping pipes, a four-quadrant converter and a plurality of rotational speed detection units. The four-quadrant converter comprises a phase-shifting transformer, a control unit and a plurality of power units. Each power unit is composed of a rectifier unit and an inverter unit, wherein the rectifier unit and the inverter unit are connected via a DC bus. The control unit comprises a valve control sub-unit and a feedback control sub-unit. The valve control sub-unit starts the valve of a corresponding water pumping pipe when the rotational speed of a corresponding water pump motor, measured by any rotational speed detection unit, is larger than a rotational speed preset value. The feedback control sub-unit drives the rectifier unit to run in the energy feedback mode when the voltage of the DC bus is larger than a voltage preset value. According to the technical scheme of the invention, the four-quadrant converter realizes the drive control of water pump motors and the energy feedback of the water pump motors at the same time. Meanwhile, in combination with the control of a contactor, the energy can be efficiently fed back to a public supply network.

The invention discloses a community public article distribution system and method based on face recognition. The community public article distribution system comprises a safe deposit box and a background server. The safe deposit box comprises a storage cabinet, an operation table and a scene camera; the storage cabinet is used for storing public supplies, the scene camera is connected with the background server, and the background server is connected with the safe deposit box, a community display device and a user terminal. The system can rapidly and accurately put public supplies into idle storage cabinets; the public supplies can be distributed to owners meeting conditions rapidly by utilizing a face recognition technology; the owners rapidly take the public supplies through the safe deposit box, so that the pickup burden of the owners is reduced, the efficiency is improved, and the delivery cost is reduced; and the public supplies can be more conveniently and rapidly put and taken.

The invention relates to a driving system for a tandem double-dynamic engineering machine. An engineering machine running by adopting single-dynamic drive has the problems that the oil consumption cost is high, the environment polluted by waste discharge, and the flexibility is poor, and has no external public supply network or cannot work under power cut, and as an adopted connection mode is a mechanical connection mode, the traditional engineering machine technology with an electromechanical dual-hydraulic drive function has the problems that the manufacturing cost is high, temperature rise is fast by adopting hydraulic drive and faults are multiple, and meanwhile, as the power supply mode of the engineering machine is of a towing type, the engineering machine is limited by cable length, and has the defects of being wide in working range and inconvenient to move. In order to overcome the problems and the defects, the invention provides the driving system for the tandem double-dynamic engineering machine, which is used for driving the engineering machine to run. The technical scheme adopted by the invention is that the lower bodywork of the engineering machine is provided with an engine (1); the output end of the engine (1) is provided with a clutch (2); the output end of the clutch (2) is connected with a motor (3); the output end of the motor (3) is provided with an oil pump (4); the output end of the oil pump (4) is connected with a working device (5), and therefore, the goal that the tandem double-dynamic engineering machine is driven to work can be achieved.