42results about How to "Maintain negative pressure" patented technology

A method and apparatus are disclosed for determining a negative pressure generated by a suction pump of a topical negative pressure (TNP) system. The method includes the steps of disconnecting a drive voltage from a pump of the TNP system, determining an EMF generated by a free-wheeling element of the pump, selecting a new drive voltage for the pump and reconnecting the new drive voltage to the pump.

Ink maintained at a negative pressure state is supplied to an ink-jet recording head via an ink supply mechanism constructed as a differential pressure valve having a coil spring and a movable membrane normally contacted elastically with a valve seat by the coil spring.

An interior pressure self-adjustable ink supply cartridge structure comprises an ink container having an ink accommodating chamber and an adjacent first ink reservoir disposed at one inner side therein wherein a first linkage shallow channel is provided to connect the ink accommodating chamber and the first ink reservoir thereby, and a second linkage shallow channel is associated with the upper edge of the first ink reservoir thereof. A passageway is linked to the other end of the second linkage shallow channel and passed across to a first guide channel of a second ink reservoir disposed at the other inner side of the ink container therein. A second guide channel is disposed extending at the other side of the second ink reservoir to communicate with a continuous winding and shallow regulation duct to which a third guide channel is connected at the other end thereof to associate the regulation duct with a preset empty chamber having an air vent disposed at the upper edge thereon. Via the aforementioned structure thereof, no matter in what state the ink supply cartridge is, whether it's being delivered, opened for ink supply, or shutoff from ink supply thereof, the negative pressure established at the ink accommodating chamber therein can be appropriately maintained on a certain level, efficiently achieving an automatic self-adjustment of interior pressure of the ink supply cartridge so as to avoid the problem of ink leakage or the situation of abnormal ink supply thereby.

A hybrid dehumidification system uses both mechanical cooling and ventilation to control humidity under control of a system which selects the best mode of operation under a given set of conditions. A purge mode using 100% outside air and exhaust is also supported to decontaminate a space. Either a single large plate heat exchanger or multiple small plate heat exchangers may be employed in the system.

A mixing apparatus for mixing a first component and a second component comprises: a first vessel which has a negative internal pressure and houses the first component; a second vessel which houses the second component; and a double-ended needle which allows communication between the first vessel and the second vessel when a first stopper element and a second stopper element have been pierced through by the needle. Penetration-resistance increasing parts which have a greater penetration resistance with respect to the first stopper element and the second stopper element than tip end tubes are respectively provided on a first puncture needle and a second puncture needle of the double-ended needle at positions further towards the base end than the tip end tubes. The axial heights of the edge faces of the tip end tubes are both less than the thicknesses of the first stopper element and of the second stopper element.

An auger airlock assembly and end dump housing having a spring loaded bottom for use in a bulk loader which utilizes a source of negative pressure to create a suction air stream that draws particulate materials into the loader for transfer, via the auger assembly, to a location remote of the loader. Materials exiting the auger assembly accumulate within the housing to a point wherein, once the accumulated material has acquired a certain weight, the bottom of the housing is forced open to permit discharge of the material, and, once the material is removed, and is not present in enough quantity to maintain the bottom of the housing to remain open, the spring loaded connection biases the bottom back into a position sealably closing the housing. The bottom of the housing may also be opened by the auger feeding more material into an already full housing, whereby the material is compressed so as to force the door open. Side portions of the housing limit the opportunity for outside air to enter the airlock assembly during the discharge of materials, maintaining the vacuum suction created by the negative pressure in the auger assembly.

A device for generating a negative pressure in the sealed room of a tablet press and/or of an isolator, with a fan connected to the sealed room and an air opening towards the sealed room, wherein the intake side of an ejector is connected with the sealed room, the working fluid connection of which is connectable with a compressed air source via a valve, with a sensor which is connected to a negative pressure control unit which opens the valve when the sensor measures a pressure in the sealed room which is above a predetermined negative pressure value, a second valve being assigned to the fresh air inlet opening, which depending on the embodiment remains opened or is triggered and closed by the negative pressure control unit.

An ink jet-printing apparatus includes an ink reservoir, a print head, a flexible pocket, and a resilient element. The print head is used for ejecting ink from the reservoir. The reservoir is substantially sealed so that ejection of ink from the reservoir decreases a pressure in the reservoir volume. The flexible pocket is disposed in the ink reservoir and is capable of slowing a decrease of the pressure in the reservoir volume by changing a reservoir volume of a reservoir cavity defined between the flexible pocket and the reservoir. The resilient element is disposed within the ink reservoir and the flexible pocket for maintaining the pressure in the reservoir volume below the ambient pressure. The flexible pocket and the resilient element regulate changes in the negative pressure of the ink-jet printing apparatus.

The invention relates to a purification drug configuration compartment, a purification drug configuration device comprises a closed purification security level configuration region, a configuration workbench is arranged in the closed purification security level configuration region, and the closed purification security level configuration region above the configuration workbench can form a drug configuration space; and a front air supply fan is arranged at the top part on the front side of the closed purification security level configuration region, and a rear air supply fan is arranged at the top part on the rear side. The purification drug configuration compartment can respectively carry out air supply purification on the closed purification security level configuration region, carry out security exhaust of air with pertinence, effectively improve the purification security level of the air and lead a main region producing volatile substances which are harmful to a drug to obtain special purification. The purification drug configuration compartment can further avoid the pollution caused by the external unclean air, carry out powerful occupational protection of dispensing staff and ensure the degree of security purification level and dispensing security.

A method of removing exhaled material from a medical procedure field adjacent to a subject's nose and mouth. In some embodiments the method includes the steps of placing an isolation barrier at least partially surrounding the subject's nose and mouth to define the medical procedure field; controlling air flow into the medical procedure field with the isolation barrier; and evacuating air from the medical procedure field at an air evacuation rate greater than or equal to the subject's respiratory minute volume. The invention also provides a system for creating an isolated medical procedure field around a subject's nose and mouth.

An ejector functioning as a vacuum generating mechanism is disposed in a main body constituting a vacuum generating unit, and an atmospheric air introducing valve is disposed between the ejector and a vacuum port. The atmospheric air introducing valve is brought into a valve closed state at times when a negative pressure is generated by the ejector under a condition in which a workpiece is held by the negative pressure generated by the ejector, whereby communication between the vacuum port and the atmosphere is blocked. On the other hand, at times when the vacuum is broken, in which the negative pressure state of the vacuum port is released, the atmospheric air introducing valve is brought into a valve open state, whereby the vacuum port communicates with the atmosphere.

The invention relates to a street cleaner with a discharging and dust removing device. The street cleaner comprises a fan, a dust removing tank, a dustbin, a dustproof cover and a dust removing pipe, wherein the dustbin is connected with the dust removing tank; the dustproof cover is connected with the dustbin; the fan is provided with a fan wind inlet and a fan wind outlet, and the fan wind outlet communicates with the atmosphere; a dust removing device is arranged in the dust removing tank, and is provided with a dust removing wind inlet and a dust removing wind outlet, and the dust removing wind inlet communicates with the dustbin; the dust removing pipe is connected between the dust removing wind outlet and the fan wind inlet; a discharging opening and a discharging ventilating opening are formed in the tail end of the dustbin; a discharging door is formed in the discharging opening; a discharging ventilating valve is arranged on the discharging ventilating opening; and the dustproof cover is connected to the tail end of the dustbin, and can communicate with the dustbin through the discharging opening and the discharging ventilating opening. According to the street cleaner disclosed by the invention, during discharging, water-free operation is performed, so that adverse influence caused by a climate factor is avoided; and in the process of discharging, the situation that dust overflows is avoided, and the street cleaner is simple in structure and easy to realize.

A negative-pressure leakage preventer of ink cartridge is characterized by that said ink cartridge has an air hole with a valve controlled by spring or elastic material. As the valve is closed, the consumption of ink can generate a negative pressure in the ink cartridge. When the negative pressure is increased to a predefined value, the valve is opened by atmospheric pressure to supplement a little air and then closed, maintainnig the negative pressure state.

The invention discloses a vertical sorting device for municipal solid waste and belongs to the field of environment protection equipment. The vertical sorting device is characterized in that a waste conveyor conveys waste into a hopper, a box is fixedly fixed below the hopper hermetically, drum screens which are arranged at intervals at at least two stages and driven by mechanical power are arranged in the box, the hopper is communicated with the drum screen at the first stage, a rotary sealing device is arranged at a feeding port of each drum screen, each discharging port is arranged correspondingly on the lower portion of the box, a belt conveyor is arranged below each discharging port, a magnetic sorting device is arranged above each belt conveyor and is a conveyor which is adjustable in inclination angle and rotation speed, an air feeding device is connectedly arranged on the feeding port at the front end of the box, the tail end of the box is connected with an air suction device, a dust removal cover is arranged between the air suction device and the box, and an air return pipeline is arranged between the air suction device and the hopper. The vertical sorting device is applied to sorting of the municipal solid waste, so that waste sorting efficiency is improved effectively, waste sorting quality is improved, and waste sorting environment is improved.

The invention provides a turntable vacuum filter device which comprises a filter device main body and a built-in gas liquid separation device. The turntable vacuum filter device is characterized in that the filter device main body comprises a washing device, a filter disc, a feed device and a discharge device, wherein the filter disc, the feed device and the discharge device are respectively connected with the built-in gas liquid separation device which is connected with a vacuum system and a front liquid seal device by pipelines, and the front liquid seal device is connected with a liquid drainage pump and a rear liquid seal device in sequence by pipelines. According to the turntable vacuum filter device, the mounting height is low, the height of a workshop is only required to be about 10 meters, more than 50% of civil engineering cost is lowered, and as the height of the disc face is lowered, a slurry groove is higher than the disc face, the slurry can flow to the disc face under the action of gravity, no charge pump is needed, the energy consumption is saved, and the equipment cost and the maintenance cost are both reduced.

The invention discloses a maintenance and care devicefor crocodile skin products. The device comprises a workbench and a shell, a cavity is formed in the workbench, an air inlet is formed in the uppersurface of the workbench, a motor is fixedly connected to the upper surface, close to the left side, of the workbench, and a rotating shaft is fixedly connected to the right end of an output shaft onthe motor; and the surface of a reciprocating screw penetrates through the shell and is slidably connected with the shell, a sliding rod is slidably connected to the inner wall of an outer contour sliding groove in the reciprocating screw, the surface of the sliding rod penetrates through the upper surface of the shell and is fixedly connected with the shell, and a first limiting arm is fixedly connected to the upper surface, close to the right side, of the workbench. Through cooperative use of the structures, the problems that in the actual use process, due to the fact that traditional careequipment is time-consuming, labor-consuming and poor in integrality during crocodile skin fixing and oiling maintenance, the working efficiency is reduced, and inconvenience is brought to use are solved.

The main objective of the present invention is to provide maintenance mechanism for lighting equipment in a closed space of high radiation activity, which comprises a passage, a lamp base, a multi-section slide rail, a lighting handle, a stainless steel fixation plate, a lead glass lamp guard and a convex lead plug. On the top side of the passage there is a multi-section slide rail with the lamp base attached to move the lamp. The maintenance hole end of the passage has a convex lead plug and a stainless steel fixation plate. When the hole closes, the convex lead plug is locked to the lead plug positioning screw under the stainless steel fixation plate; while the maintenance hole opens, on the top right and top left of the stainless steel fixation plate there is a L-shaped short iron plate and a L-shaped long iron plate respectively. On the L-shaped long iron plate there is an axial screw as the axis for the convex lead plug to move and rotate. On the L-shaped short iron plate there is a lead plug positioning screw for the convex lead plug after being pulled out to have temporary fixation. At the radiation space end of the passage there is a semi-circular lead glass lamp guard for the shielding wall to be fixed without moving with the lighting equipment.

The invention relates to a garbage incinerator resource comprehensive utilization device. The garbage incinerator resource comprehensive utilization device comprises a garbage storage warehouse (1) and a garbage incinerator chamber (2), wherein the garbage storage warehouse (1) and the garbage incinerator chamber (2) are connected through an odor pipeline, and a fan (3) is arranged on the odor pipeline and is used for conveying odor generated by garbage to the garbage incinerator chamber (2) to be incinerated. Compared with the prior art, the odor of a waste power station is introduced into ahearth for combustion, so that the odor is prevented from directly discharging the surrounding environment, the harmless treatment of the odor of the waste power station is realized, the environment is protected, and the comprehensive utilization efficiency of the waste power station is improved;