78results about How to "Avoid differential pressure" patented technology

A spirometer having a housing with an elongated flow chamber open at one end, a pressure sensing end opposite the open end and an outlet passageway intercepting the flow chamber at an angle α and proximate the pressure sensing end. A differential pressure sensor is coupled to the pressure sensing end from a port at an angle β to an axis of the flow chamber. The angle α is substantially greater than 0° but substantially less than 180° while the angle β may range from 90° to 180°, such that a significantly increased measured air pressure results over that measured when α=180° and β=90°.

Disclosed is a smoke control system provided in a high-rise building for separately supplying leakage air flow and supplementary air flow, including: a blowing means for supplying air into a building; a ventilating means having a leakage air flow supplying passage and a supplementary air flow supplying passage connected to the blowing means for introducing air; and an air supply damper connected to the leakage air flow supplying passage and the supplementary air flow supplying passage to supply air into each lobby of a building according to the leakage air flow and supplementary air flow.

The invention concerns a reverse osmosis system (1) with a membrane unit (2) comprising an inlet (3), a permeate outlet (4) and a concentrate outlet (5), a high-pressure pump (8) that is connected to the inlet (3), a pressure exchanger (11) connected on its concentrate side (10) to the concentrate outlet (5), and a booster pump between the pressure exchanger (11) and the inlet (3). It is endeavoured to make the energy consumption as small as possible. For this purpose, the booster pump is made as a displacement pump.

The invention relates to a lithium battery pack free from welding, easy to maintain and capable of being connected in parallel. During the battery pack fabrication process, spot welding and welding are not needed, and the lithium battery pack is convenient to operate and maintain. In the technical scheme adopted by the invention, the lithium battery pack free from welding, easy to maintain and capable of being connected in parallel comprises a plurality of battery modules and a protection circuit module, wherein the battery modules are connected in an end-to-end way, one end of the whole battery module is connected with the protection circuit module, the battery modules are of sealed shell structures, multiple groups of single-strand battery modules are arranged in the battery modules, positive electrodes or negative electrodes of the single-strand battery modules are connected through a pole plate, the two ends of the pole plate are arranged on two opposite side surface of a shell, each single-strand battery module comprises a plurality of cylindrical monomer batteries, and the positive electrode and the negative electrode at the upper end and the lower end are provided with supports. The lithium battery pack has the advantages that the battery module and the production circuit are two independent modules and are physically pressed and connected, the lithium battery pack is convenient to operate, and a fault is easy to detect.

A spark containment cap is disclosed for enclosing an end of a fastener protruding from a structure. The cap includes a cap body having an annular base terminating at a rim which surrounds an opening into an air cavity arranged to enclose the fastener end and having an aperture in fluid communication with the cavity. An annular bead of uncured sealing material is provided around the opening into the cavity, the bead of sealing material being curable to provide a seal between the cap body and the structure to seal a volume of gas within the cavity. A closure member has a closed configuration in which it seals the aperture, and an open configuration in which it does not seal the aperture.

The invention discloses a labyrinth damping sealing device with low leakage and high damping performance. The sealing device comprises a rotating shaft, sealing long teeth, sealing short teeth and a damping part, wherein the rotating shaft is provided with a plurality of bosses and grooves, which are axially and alternately arranged; and the sealing long teeth, the sealing short teeth and the damping part are fixed on a sealing stator ring. The damping part has the following three structures: a honeycomb structure, a hole structure and a bag structure. The labyrinth damping sealing device has the characteristics of low leakage and high damping; the possibility of causing damage to a rotor and a sealing part due to impact and rubbing between the damping sealing part (which is of a honeycomb structure or a hole structure) and the rotor is also eliminated; and not only can the energy conversion efficiency and the operation stability of a turbomachinery be further improved, but also the service life of the sealing part can be prolonged.

Pulse back washing for applying a back pressure from the filtrate side to the raw water side of the membrane is repeated plural times for recovering a TMP during usual main back washing applied by suspending membrane filtration, when the TMP is increased when tank water extracted out of a biological treatment tank 1 is filtrated through the membrane by a cross-flow method. Pulse back washing is applied at a stage when the TMP is 80% or less of the permissible TMP to peel the deposits on the membrane surface, and the peeled deposits are returned to the biological treatment tank concomitantly with a circulating flow. Clogging substances on the separation membrane is removed in a direction opposite to the direction of pulse back washing by selecting the destination of discharge of back wash drain to be the inlet side of the separation membrane in the main back wash step.

The invention discloses an ORC power generation system based on series connection of multistage evaporators. The system comprises n evaporators , wherein the n evaporators are connected in series sequentially on a heat source side; a heat source fluid enters a first evaporator, is discharged from a last evaporator and is recharged to the underground; a working medium side of each evaporator is connected to n inlets of a steam turbine; an outlet of the steam turbine is sequentially connected with a preheater and a condenser in series; a working medium enters the preheater and the condenser, and then enters the other side of the preheater again and exchanges heat with exhaust steam exhausted by the steam turbine after working; the working medium flowing out of the preheater enters n working medium pumps in a parallel connection manner, and the n working medium pumps are connected to the n evaporators correspondingly, so that the closed cycle of the working medium is formed; a cold source side of the condenser is connected to a cooling water circulation system; a plurality of evaporator heat source sides are in series connection; and the working medium side is directly connected with the steam turbine in parallel, so that the defect that a single evaporator in a conventional ORC system is irreversible and has large loss is overcome, and the utilization efficiency and the technical economy of the system are improved.

The invention relates to a method for low-pressure casting. A crucible is a core device which is divided into an inner space and an outer space independent of each other in the crucible, gases are passed into the two spaces, and the pressures in the two spaces are basically kept equal to each other and are changed synchronously basically. The device used in the method for the low-pressure casting particularly uses the crucible as the core device; and the device is provided with a structure which separates the inner part and the outer part of the crucible into two independent parts that are not communicated with each other and can be sealed relatively. The method is particularly suitable for the low-pressure casting of a magnesium alloy and can prevent a heating element from being eroded by SF6; a low-cost silicon series refractory material can be used in a hearth; a device used in the method has the advantages of simple structure, convenient operation and good technical effect; the used casting method has a simple process and performs works in terms of a special device; and the method has greater economic and social values.

The invention provides a printing unit for a printer, which comprises an inking unit, a transfer cylinder (14) and a forme cylinder. The inking unit is used for applying the printing ink onto at least one printing form on the forme cylinder. The printing ink positioned on the basis of each printing forme has at least one on the transfer cylinder (14) as a blanket or blanket plate (23) formed transfer form on a substrate to be printed (21) coatable, wherein between the transfer cylinder (14) and the or each blanket or between the transfer cylinder (14) and a metal support (24) of the or each blanket plate (23) a contact structure (28) is positioned, that is either with the transfer cylinder (14) or with the metallic support (24) of the respective rubber blanket plate (23) connected.

The invention aims at providing a three-turbocharger three-stage sequential turbocharging device with an EGR achieving function and a three-turbocharger three-stage sequential turbocharging control method with the EGR achieving function. The sequential turbocharging device comprises an exhaust header, an air-intake header, a first big turbocharger, a second big turbocharger and a small turbocharger, wherein the inlet end of a first turbine communicates with the exhaust header, the inlet end of a second turbine communicates with the exhaust header, the inlet end of a small turbine communicates with the exhaust header, and the outlet end of the first turbine, the outlet end of the second turbine and the outlet end of the small turbine all communicate with an exhaust header pipe; and the inlet end of a first air compressor, the inlet end of a second air compressor and the inlet end of a small air compressor all communicate with an air-intake header pipe, and the outlet end of the first air compressor, the outlet end of the second air compressor and the outlet end of the small air compressor all communicate with an air outlet header pipe. According to the three-turbocharger three-stage sequential turbocharging device and control method with the EGR achieving function, the effect of performing sequential turbocharging to improve the low working-condition performance of a diesel engine can be achieved, the NOx exhaust requirement of the diesel engine in an exhaust control area can be met through EGR, and the comprehensive performance of the diesel engine can be greatly improved.

The invention a method for manufacturing a polyethylene microporous filter tube for secondary filtering of compressed air, which comprises the steps of: A, sieving polyethylene powder with a sieving machine; B, coating silicone oil on the inner wall of an external iron tube mould and the outer wall of an internal iron tube mould for reverse mould sintering and assembling a mould body; C, pouring siftage sieved by the sieving machine between the inner wall of the external iron tube mould and the outer wall of the internal iron tube mould; D, placing the mould body in a constant temperature furnace, sintering for 5-6 hours at 250-300 DEG C; and E, cooling the mould body to room temperature and de-moulding. As a novel filtering medium, the polyethylene microporous filter tube manufactured by novel materials, with novel technology and processes, has high and stable filtering precision, long service life and easy cleaning and is non-toxic, corrosion resisting, temperature resisting at 90 DEG C and can be recycled repeatedly and is an ideal material for various industries to implement high precision gas-solid separation and oil-gas separation. In the manufacturing process, the filter core is only sintered to form at one time, thereby reducing the cumbersome multi-step manufacturing means and saving the labor.

The invention belongs to the technical field of machining and particularly relates to a molded surface constraint ultrasonic vibration auxiliary rotating abrasive flow finishing machining device. Thedevice comprises a constraint molded surface, an ultrasonic vibration device, a sleeve and a spindle tool shank. The upper end of the sleeve is connected with the spindle tool shank. The ultrasonic vibration device comprises an ultrasonic amplitude change rod and an ultrasonic transducer. The ultrasonic transducer is arranged in the sleeve, and the lower end of the ultrasonic transducer is connected with the upper end of the ultrasonic amplitude change rod. The wave nodal point of the ultrasonic amplitude change rod is connected with the lower end of the sleeve. The lower end of the ultrasonicamplitude change rod is connected with a workpiece. The workpiece is located in an inner cavity of the constraint molded surface. The molded surface rotation center line of the constraint molded surface is parallel to the axis of the workpiece. The constraint molded surface is filled with fluid abrasives over the workpiece. The surface to be machined of the workpiece is matched with the inner wall of the constraint molded surface. The molded surface constraint ultrasonic vibration auxiliary rotating abrasive flow finishing machining device can avoid the inlet and outlet differential pressure,improve the machining efficiency and surface smoothness of the workpiece, shorten the machining time, save the machining cost, achieves the purpose of machining without dead angles and ensure the surface shape precision of the workpiece.

The invention relates to a device and a method for extracting oil-tea camellia seed oil at low temperature by taking a liquefiable gas as a solvent, which are used for extracting the oil-tea camellia seed oil. The inner side of an extracting container is at least provided with a group of more than two equal-distance or unequal-distance inlets capable of being opened and closed; the inlets are connected with a pump for inputting a solvent gas through a pipeline; the equal distance or unequal distance refers to a distance from a port end of the pipeline inserting to the inner side of the extracting container to the inner bottom surface of the extracting container; and the inlets capable of being opened and closed are connected with the pump for inputting the solvent gas through different pipelines or the same pipeline. The invention has the advantages that: the utilization rate of the camellia seed oil can be improved, the quality of crude oil is improved, a refining step is eliminated, the production period is shortened and the loss of nutrient substances in the camellia seed oil is reduced.

A differential pressure sensor system for use in an aircraft comprises a differential pressure sensor for determining a differential pressure between a pressurizable aircraft cabin and an aircraft environment, the differential pressure sensor having a first port connectable to the pressurizable aircraft cabin via a first line and a second port connectable to the aircraft environment via a second line. A shut-off device of the differential pressure sensor system is arranged in the second line which is switchable between an open position in which it opens the second line, such that a pressure prevailing in the aircraft environment acts on the second port of the differential pressure sensor, and a shut-off position in which it closes the second line, such that the second port of the differential pressure sensor is shut off from the pressure prevailing in the aircraft environment.

Disclosed is an evacuation system for use with plastic extrusion dies, in particular a contaminant evacuation system for removal of air borne contaminants generated at the die orifice of a plastics extrusion apparatus. The system includes an annular evacuation chamber and a suction source connected to the evacuation chamber for generating a vacuum in the evacuation chamber. The evacuation chamber has a radially inwardly directed annular air intake opening for placement about the die orifice, and a baffle structure in the evacuation chamber for equalizing suction pressure along the air intake opening and reduce or avoid localized pressure differences around the extruded product, which would lead to deformation of the product.

The invention discloses a nasal catheter fixation device for use with a neonatal CPAP breathing machine. The device includes a square rod support base, a nasal intubation plate, an air duct pipe, a connecting bar rack, a human-computer interface table, a stand column plate and a liquid oxygen mixing valve seat. Through combination of the nasal intubation plate and the liquid oxygen mixing valve seat, and through treatment with a humidification water tank liquid passage and a pure oxygen storage box air passage utilizing a bent backwashing pipe connector cap of the liquid oxygen mixing valve seat, the retention amount of water vapor in the nasal intubation plate and the air duct pipe is ensured to be lowest, and recoil force allows a rotary sieve to filter condensate of the tidal volume, thus ensuring that water vapor and oxygen are mixed to achieve an oxygen supplementing wetting effect, relieving alveolar intumescence by vapor attachment, adjusting a durable dried situation of the lung passage, making respiratory muscle loose, wet and elastic, promoting increase of the functional residual volume, improving lung compliance, improving respiratory regularity of newborns, and allowingthe device to automatically match with needs of a child's body to achieve micro-adjustment and high oxygen mixing adaptability.