388results about How to "Increase negative pressure" patented technology

The present invention relates to a negative pressure wound closure system and methods for using such a system. Preferred embodiments of the invention facilitate closure of the wound by preferentially contracting to provide for movement of the tissue. Preferred embodiments can utilize tissue grasping elements to apply a wound closing force to the tissue.

The present invention relates to a negative pressure wound closure system and methods for using such a system. Preferred embodiments of the invention facilitate closure of the wound by preferentially contracting to provide for movement of the tissue. Preferred embodiments can utilize tissue grasping elements to apply a wound closing force to the tissue.

A vacuum generator is provided wherein the intake vacuum of a combustion engine is led to a negative pressure device such as a vacuum booster of a brake booster device through a check valve. An idling air passage is connected to a suction pipe of the combustion engine to bypass a throttle valve arranged in the suction pipe. An ejector is arranged in the idling air passage at the downstream of an idle speed control valve in serial relation to the same, and the intake for idling is performed through the ejector. As the intake air flow passing through the idling air passage increases, the intake negative pressure which is generated at a vacuum takeout port of the ejector is further increased in absolute value, whereby the negative pressure device has a negative pressure which is further increased in absolute value.

The invention discloses a high-light-concentration solar-energy and hot-airflow wind / solar coupled generating system, comprising a turbine generator, turbine fan blades, a secondary-stage turbine wind generator, a third-stage turbine wind generator, a plurality of vertical-axis wind generator, a vertical-axis wind turbine, a high-light-concentration heat collecting lens, a diversion-tower inner-wall panel heat retainer, a serpentine-tube type heat collector, a Fresnel light concentrator, a high-light-concentration gallium arsenide photovoltaic cell system and a film photovoltaic cell system. The high-light-concentration solar-energy and hot-airflow wind / solar coupled generating system has the advantages that the high-light-concentration heat collection efficiency is higher than air temperature of a conventional chimney-type heat-power-generating heat collecting shed, after a high-temperature hot airflow enters the diversion tower, air speed is improved by 5-10m / S, and the generated power of turbines is improved by 30% for work application; the height of the diversion tower is reduced by more than 60%; the air negative pressure is increased, the air density is decreased, and a hot-airflow chimney effect is enhanced; the turbines are coupled with the vertical-axis generator to make up the motive power compensation caused by air speed reduction at night; the vertical-axis wind turbine drives the turbine generator to simultaneously or alternatively and independently drive the turbine generator to rotate for power generation through a gear; and thus, the all-weather continuous power generation is realized.

An ejector capable of generating a high negative pressure capable of sucking and conveying fine metal pieces such as cuttings, for example, in a case of using the ejector as a driving source for a fluid conveyor, comprising a convergent-divergent nozzle having a throat formed between a suction port and a discharge port in which jet blowing holes are formed in the convergent-divergent nozzle for jetting a jet stream from the upstream to the downstream of the throat thereby forming a negative pressure, wherein pressure control holes are formed being opened to the downstream of the jet blowing holes for communicating a pressure space at a level higher than a negative pressure formed by the jet stream and lower than a static pressure of the jet stream and the inside of the convergent-divergent nozzle.

Improved respirator fit-test methods and apparatus featuring an automated, respirator wearer-controlled, air-leak measurement system. For fit testing of a respirator positioned on a test subject's face and connected to a controlled negative pressure testing apparatus, the test subject simply holds his breath and then activates a switch in electrical connection with said apparatus, which results in the automatic closure of the breathing port on the respirator and the initiation of a complete fit-testing protocol. The fit-testing apparatus includes a single, self-contained, automated unit that includes a vacuum source (30), an air-flow measuring device, and an air-pressure transducer (32) for connection to a respirator (10) being tested. By measuring the rate of air exhausted from the respirator in order to maintain a constant challenge pressure, an air leakage rate is determined.

A pool cleaning system including means responsive to the magnitude of negative pressure at the suction inlet of a system pump for controlling pump water flow in order to prevent pump cavitation. Systems in accordance with the invention are configured to pump a high rated volume of water when operating in a filtering mode and to provide a high negative pressure to power a pool cleaner when operating in a cleaning mode.

A sucker includes a sucker body having a rough suction layer which includes a plurality of protrusions which are juxtaposed to each other closely, and a plurality of grooves defined between the protrusions. When the rough suction layer presses an attached face and is disposed at a negative pressure state, the sucker body is pressed toward the attached face by a normal force from the ambient air, so that the rough suction layer is compressed, and the grooves form multiple independent negative pressure or vacuum zones, to increase a negative pressure of the rough suction layer, to decrease air existing in the rough suction layer, and to reduce a vacuum leak in the rough suction layer, so as to increase an air-tightness between the rough suction layer and the attached face.

The invention discloses a multilayer inner flame combustor which consists of a combustor body and a distributor device, two fire orifice layers of an upper layer and a lower layer are arranged on the distributor device, and fire orifice outlets are arranged inwards; air channels are arranged or not arranged between fire orifices in the upper layer; a single inner chamber or two independent inner chambers are arranged; the two independent inner chambers are arranged so as to independently adjust flame in the upper and the lower layers; the air channels are arranged so as to lead air supplement to be more sufficient. The multilayer inner flame combustor is characterized by double-layered cyclonic flame, large heat transfer rate, high thermal efficiency, low CO and NOx content in flue gas and unblocked fire orifices, and the like, and can be widely used in inner flame gas cookers.

A method of reducing foreign object debris (FOD) during drilling operations is provided. The method includes disposing a vacuum housing with a computer aided design (CAD) formed drill template in an operative position on a work piece, actuating a vacuum operatively connected to the vacuum housing, thereby creating negative pressure between the template and the work piece, the negative pressure acting on the debris resulting from the drilling operations, and enhancing the negative pressure without manipulating the vacuum.

The embodiment of the invention discloses a method and device for detecting the automatic sample injection of a laboratory liquid. The method disclosed by the embodiment of the invention comprises the following steps: controlling a microprocessor to enable a driving pump to enhance the positive pressure or negative pressure of a pipeline by extracting the gas in a connecting pipe and a cuvette; finishing the steps of sampling color comparison, liquid drainage, moistening and cleaning under the condition that no manpower participates in the operation; and regulating and controlling the on-off action of the corresponding valves when each operation is carried out. In the embodiment of the invention, the testing course is simple and rapid; and moreover, the control of the microprocessor is matched with the slow liquid injection and air exhaust action of the driving pump and the accurate monitoring of a liquid height detector for the liquid injection height of the connecting pipe, thereby overcoming the defects of air bubbles and water blockage because of the existing artificial liquid pouring and realizing the purposes of greatly reducing testing errors and reducing reagent water source waste.

The invention relates to a method of monitoring the function of a selective catalytic reaction (SCR) catalyst, which is the method of monitoring the function of the SCR catalyst being as the waste gas aftertreatment system of an internal combustion engine. The SCR catalyst comprises at least one feed pump (5), at least one manifold valve (9), at least one metering valve (3) and at least one pressure sensor (10). In the sucking-back module of a SCR catalyst system (1), the negative pressure establishment in the SCR catalyst system can be observed by means of at least one measuring value of the pressure sensor (10). When the at least one measuring value deviates an expected reference value, the mistake of the function of the SCR catalyst system can be concluded.

There is disclosed an ink jet recording apparatus which comprises a pit-in ink supply mechanism for interconnecting a main tank and a subtank to be communicated with / separated from each other, and supplying an ink from the subtank to a recording head. In this constitution, an ink residual amount V in the subtank during recording or at the end of recording is selected to be V>v / b in which V is the ink residual amount in the subtank during recording or after the end of recording, b (1>b>0) is a nonvolatile component ratio of the ink, and v is a volume of a liquid chamber of recording means.

The invention discloses a plastic particle screening device and relates to the field of plastic processing. The plastic particle screening device comprises a support, a main air pipe, a screen and material collection bags made of non-woven fabric, wherein the main air pipe is transversely arranged and fixed to the support; one end of the main air pipe is a feeding end, the other end of the main air pipe is a selecting end, a feeding inlet is formed in the side wall of the feeding end, and a feeding fan is installed at the end of the feeding end; the screen is fixed in the selecting end, and discharging pipes are fixed to the side walls, located on the two sides of the screen, of the selecting end and communicate with the main air pipe; a discharging air pipe forming a tee structure with each discharging pipe is fixed to the end of the discharging pipe, a discharging fan is installed at one end of each discharging air pipe, the material collection bags are fixed to the other ends of the discharging air pipes, and the feeding fan and the discharging fans are all ion fans. By the utilization of the characteristics that plastic particles are low in mass, suspend under interference of airflow and can be pushed by airflow, the plastic particles pass through the screen to be rapidly screened.

The syringe pressure generating and pressure displaying device of the present invention is constituted in such a way that an auxiliary device is detachably joined to a cylinder flange while a rod bar is provided in the auxiliary device so as to pass therethough, and hand pressure on a lever that is hinge connected to the auxiliary device so as to be disposed horizontally in line with the syringe creates a rotational motion acting due to leverage, whereupon said rotational motion is converted to a linear motion via a motion-converting means, and the rod bar and a piston are moved with increased force.

The invention discloses a non-contact handling device and relates to a handling device. The device comprises a cover body with a cylindrical inner hole, gyratory fan blades arranged in the cover body and a power input shaft for driving the gyratory fan blades to rotate, wherein the central position of the top end of the cover body is provided with a power input shaft mounting hole and air sucking ports distributed on the periphery of the power input shaft mounting hole; each gyratory fan blade consists of a shaft sleeve and blades distributed on the shaft sleeve; the lower parts of the blades are vertical, the upper parts are bent, and the bending directions of the blades are consistent with the rotation directions of the gyratory fan blades; and one end of the power input shaft passes through the power input shaft mounting hole and is connected with the shaft sleeve of the gyratory fan blades in the cover body, while the other end is connected with a rotary drive device arranged outside the cover body. The device has the characteristics of low energy consumption and strong suspension force, can be driven by adopting a motor, has the advantages of low cost, wide application range, large motion range, and the like, conforms to the development trends of energy saving and high efficiency in the semiconductor industry at present and is easy to popularize and apply.

The invention discloses a burner of an inner flame gas stove, which consists of a burner body and a fire distributer device; an upper layer fire hole and a lower layer fire hole are arranged on the fire distributer device and the direction of the outlets of the fire holes is inward, and an air channel is arranged or not arranged between the upper layer fire hole and the lower layer fire hole; a single inner cavity or two independent inner cavities is or are arranged; the two independent inner cavities are arranged so that the flame at the upper layer and the lower layer can be regulated independently; while the air channel is arranged so that the air supplementation can be more abundant. The burner utilizes multiple-layer fire holes, stratified combustion and multiple-layer cyclonic flame, and has the advantages of large heat flow, fierce fire power, high heat efficiency, low-CO and low-NOx in smoke gas, no fire hole blocking and the like.

The invention discloses a manufacturing method of a lower-absorbing range hood and the lower-absorbing range hood. A gas-absorbing face shield connected with a subpressure tube is arranged around a stove to absorb the generated oil-smoke in a short distance. By the gas-absorbing shied which is arranged around the stove and is connected with the subpressure tube, the oil-smoke coming from the frying pan during dishes-frying can be directly absorbed by the invention so as to reduce the chance of oil-smoke diffusion and contamination to the indoor environment; a fan is arranged at the upper end of the stove to generate downward air so as to lead the straight-upward oil-smoke to float to the pan side for being conveniently absorbed by the gas-absorbing face shield, thus further reinforcing the oil-smoke absorption effect; an axial fan is connected with a circular smoke tube, thus further enlarging the subpressure in the circular smoke tube and increasing the oil-smoke absorbing force.

A sucker includes a sucker body having a rough suction layer which includes a plurality of protrusions which are juxtaposed to each other closely, and a plurality of grooves defined between the protrusions. When the rough suction layer presses an attached face and is disposed at a negative pressure state, the sucker body is pressed toward the attached face by a normal force from the ambient air, so that the rough suction layer is compressed, and the grooves form multiple independent negative pressure or vacuum zones, to increase a negative pressure of the rough suction layer, to decrease air existing in the rough suction layer, and to reduce a vacuum leak in the rough suction layer, so as to increase an air-tightness between the rough suction layer and the attached face.