Abstract: An ink jet record head which has rows of pressure generation chambers (1) having nozzle openings (5), common ink reservoirs (2) placed along the row direction of the pressure generation chambers, ink supply passages (3) for communicating the ink reservoirs with the pressure generation chambers to communicate with each other, and piezoelectric vibrators for causing the pressure generation chambers to generate pressure. The opening parts of the ink supply passages in the proximity of each end part of the ink reservoir are arranged closely as compared with the opening parts of the ink supply passages in the proximity of the center of the ink reservoir.

Abstract: An ink jet recording head including a flow path unit having pressure generating chambers, a piezoelectric vibrator for pressurizing the pressure generating chambers, a semiconductor integrated circuit for supplying a drive signal to the piezoelectric vibrator, and a member for absorbing the heat produced by the integrated circuit.

Abstract: A drive signal COM1 or COM2 generated by a drive signal generator includes: a drive pulse DP1 or DP3 whose bias level is adjusted to a middle voltage Vm; a drive pulse DP2 whose bias level is adjusted to a ground voltage GND; a ready signal DP0, which includes a first correction element P0 for dropping the voltage from the middle voltage Vm to the ground voltage GND; and a recovery signal DP4, which includes a second correction element P14 for raising the voltage from the ground voltage GND to the middle voltage Vm. The ready signal DP0 precedes the drive pulse DP2, and the recovery signal DP4 follows the drive pulse DP2.

Abstract: An ink jet recording head of the type in which a passage unit is formed as a layer structure made up of a passage forming plate and an elastic plate. The elastic plate is formed with a thick portion and a thin film portion. The thick portion bonded to the common ink chamber is used as a beam structure deformable toward the common ink chamber. The beam structure is deformed to create a flexure in a thin film sealing the common ink chamber.

Abstract: In order to ease the discharge of air bubbles stagnated in end portions of a reservoir in an ink jet recording head, the end portions of the reservoir are so formed that the widths thereof are substantially equal to the depths thereof. Air bubbles entered in those portions are drawn into pressure generating chambers by directly applying negative pressure to discharge outwards from nozzle orifices.

Abstract: An ink jet record head which has rows of pressure generation chambers (1) having nozzle openings (5), common ink reservoirs (2) placed along the row direction of the pressure generation chambers, ink supply passages (3) for communicating the ink reservoirs with the pressure generation chambers to communicate with each other, and piezoelectric vibrators for causing the pressure generation chambers to generate pressure. The opening parts of the ink supply passages in the proximity of each end part of the ink reservoir are arranged closely as compared with the opening parts of the ink supply passages in the proximity of the center of the ink reservoir.

Abstract: A liquid jetting apparatus of the invention includes a pressure chamber having an inside space whose volume is changeable, into which a liquid is supplied and which is communicated with a nozzle. A Helmholtz resonance frequency of the pressure chamber has a period of TH. A signal-generating unit generates a driving signal, which includes a first signal-element for causing the pressure chamber to expand, a second signal-element for causing the pressure chamber to contract from an expanded state thereof in order to jet a drop of the liquid through the nozzle, and and a third signal-element for causing the pressure chamber to expand to an original state before outputting the first signal-element after the drop of the liquid is jetted. A pressure-generating unit causes the pressure chamber to expand and contract, based on the driving signal.

Abstract: A method of driving an ink-jet recording head which is provided with nozzle openings, pressure generating chambers each communicating with reservoirs via ink supply ports and keeping the Helmholtz resonance frequency with a period Tc, and piezo-electric vibrators for expanding and contracting the respective pressure generating chambers. The method of driving the ink-jet recording head comprises a first step of expanding the pressure generating chamber, a second step of maintaining the expanded condition, and a third step of causing an ink droplet to be jetted from the nozzle opening by contracting the pressure generating chamber thus expanded.

Abstract: The present invention relates to a deodorizing system for reducing the size of a facility and realizing the thermal efficiency much higher than the prior art, wherein a deodorizing furnace 1 is connected with thermal equipment 8 which uses a heated gas current as a heat source through an out-of-furnace circulating path 4 in order to circulate combustion exhaust gas in a deodorizing furnace 2 which has been used for incineration or thermal decomposition of odor components. When the combustion exhaust gas passes through a regenerative bed 5A or 5B on an intake side of the out-of-furnace circulating path, a part of sensible heat of the combustion exhaust gas is recovered in the regenerative bed 5A or 5B and the combustion exhaust gas is turned into a heated gas current that can be used in the thermal equipment 8 to be then supplied to the thermal equipment 8.

Abstract: With respect to a radiant tube burner to be used for heating a heating furnace or the like, to suppress the generation of NOx accompanying combustion, to make the structure thereof fit for a radiant tube burner equipment, to simplify the control of a fuel supply system and an air supply system, and to prevent the coking. Furthermore, to provide a combustion control scheme appropriate to a radiant tube burner. For these purposes, the present invention placed the respective tips of a fuel nozzle, e.g., pilot burner joint-use nozzle (11), and an air throat (13) in the end of a radiant tube (3) and moreover has a combustion air injection port (33) of the air throat (13) provided to be deviated in contact with or near to the inner circumferential wall surface of the radiant tube (3). In addition, a control device (307) for making a burner burn alternately.

Abstract: According to the present invention, gas which contains no impurities and has a high temperature of approximately 700 to 1400.degree. C. can be supplied for a long period with a short preparation time, and fluctuation in the temperature during supply can be reduced.

Abstract: A combustion method in an industrial combustion system is provided, in which a low temperature combustion air to be fed to a combustion zone of the combustion system is preheated through a high-cycle regenerative combustion system. The high-cycle regenerative combustion system includes a pair of regenerators of honeycomb structure having a plurality of fluid passages defined by honeycomb walls thereof. Either of the combustion air and an exhaust gas generated in the combustion zone is adapted to selectively flow through the fluid passages, and the high-cycle regenerative combustion system has a switching cycle time set to be 60 seconds at the longest, so that the regenerator is alternately in heat-transferable contact with the combustion air flow and the exhaust gas flow to perform heat exchange therebetween. The regenerator has a temperature efficiency greater than 0.

Abstract: A boiler is provided with a radiation heat transfer section in its combustion chamber, which has therein, at least one regenerative-heating burner system including a pair of burners each with a regenerative bed. The burners receive combustion air and exhaust combustion gas which passes through the regenerative beds. Combustion is alternately effected in one of the burners and combustion gas is passed into the other burner, and exhausted through the corresponding regenerative bed of this other burner. Surplus thermal energy which is not completely consumed in the radiation heat transfer section is recovered in the regenerative bed. Combustion air than passes through the heated regenerative bed to heat the air. The boiler temperature is kept flat across the boiler. That is, the temperature is kept almost constant across the combustion chamber. This is done by maintaining a high rate of forced supply of more than 60 m/s for the combustion air.

Abstract: A regenerative heat exchange system performs heat exchange by alternately passing combustion exhaust gas as high-temperature fluid and combustion air as low-temperature fluid through a fixed regenerator. A regenerative burner carries out combustion using preheated air from the exchange system. The regenerative heat system comprises: a permeable regenerator partitioned into three or more chambers in the circumferential direction; a double-pipe outlet/inlet partitioned into a supply chamber and an exhaust chamber; and changeover member which isolates the regenerator from the outlet/inlet and by which the regenerator selectively communicates with the outlet/inlet by a supply communicating hole and an exhaust communicating hole which are provided with such a positional relation that the supply communicating hole and the exhaust communicating hole do not simultaneously lie in any of the partitioned chambers.

Abstract: In combustion using air preheated by regenerative direct heat exchange between exhaust gas and the combustion air using a regenerator as a heat exchange medium, the present invention relates to a low-NOx burner that is effective for reduction in NOx in a mid-temperature range which has been conventionally difficult to be realized and improves stability of the flame. According to this low-NOx burner, at an outlet of an air throat 24 for flowing a full quantity of the combustion air is disposed a burner tile 22 having an enlarged diameter portion 23 thereof whose diameter is larger than that of the outlet, and a fuel nozzle 19 for injecting the fuel from the enlarged diameter portion 23 of the burner tile is also provided.

Abstract: A small once-through boiler can avoid burning caused due to excessive heating of water pipes and burning around a fire hole of a burner in particular and heighten the heat load of a combustion chamber to further reduce the size of the system as compared with a prior art boiler. In the small once-through boiler, at least one regenerative burner system 20 is provided in a combustion chamber 1, the regenerative burner system 20 carrying out supply of combustion air A and exhaust of combustion gas E through a regenerator 22 and relatively changing flows of the combustion gas E and the combustion air A with respect to the regenerator 22 so as to supply the combustion air A via the regenerator 22 heated by heat of the combustion gas. Water pipe group 4 is provided apart from the combustion chamber wall surface 3 to form a passage 12 between the rear surface of the water pipe group 4 and the combustion chamber wall surface 3.

Abstract: A high-cycle regenerative combustion system has first and second regenerative heat exchanger units. A four-way valve is provided for alternately bringing the heat exchanger units into contact with a low temperature fluid and a high temperature fluid. The valve is switched at a switching cycle time not longer than 60 seconds. Each heat exchanger unit has a void ratio .epsilon. which substantially provides the maximum value (Q/V)max of the volumetric efficiency (Q/V). The temperature efficiency .eta. t is preset to be a value in a range between 0.7 and 1.0. The heat transmission coefficient h and the heat transmission area A of the heat exchanger unit are determined such that the temperature efficiency, which is calculated in accordance with a specific equation as being a function of the heat transmission coefficient, the heat transmission area and the switching cycle time .tau., falls under the preset value within the range mentioned above.

Abstract: The present invention relates to a four-port valve capable of controlling directions of the flow of two types of fluid.

Abstract: An industrial furnace and a burner for regenerative combustion includes a heat storage member, a switching mechanism disposed on one end of the heat storage member, and a burner tile disposed on the opposite end of the heat storage member. The burner tile has a protruding portion extending ahead an air supply and gas exhaust surface. The switching mechanism has a stationary disk and a rotatable disk which slidably contacts the stationary disk. A speed of supply air to the furnace is in operation equal to or higher than a speed of exhaust air therefrom.

Abstract: A boiler is provided with a radiation heat transfer section in its combustion chamber, which has therein, at least one regenerative-heating burner system including a pair of burners each with a regenerative bed. The burners receive combustion air and exhaust combustion gas which passes through the regenerative beds. Combustion is alternately effected in one of the burners and combustion gas is passed into the other burner, and exhausted through the corresponding regenerative bed of this other burner. Surplus thermal energy which is not completely consumed in the radiation heat transfer section is recovered in the regenerative bed. Combustion air then passes through the heated regenerative bed to heat the air. The boiler temperature is kept flat across the boiler. That is, the temperature is kept almost constant across the combustion chamber. This is done by maintaining a high rate of forced supply of more than 60 m/s for the combustion air.