47results about How to "Eliminate dead volume" patented technology

Pressure swing adsorption (PSA) separation of a feed gas mixture is performed within an apparatus having typically a single prime mover powering a feed compressor for one or multiple rotary PSA modules in parallel, each module including a rotor with a large number of angularly spaced adsorber elements, with valve surfaces between the rotor and a stator so that individual adsorber elements are opened to compartments for staged pressurization and blowdown, with thermally boosted energy recovery from staged expansion of countercurrent blowdown and light reflux gases, and a plurality of adsorber elements opened at any instant to each compartment so that each compressor and expander stage operates under substantially steady conditions of flow and pressure.

The invention relates to a flow cell for an ultrasonic flow meter comprising two transducers of ultrasonic waves wherein the two transducers are reversibly detachable from the flow cell. The flow cell with the transducers detached is sterilisable and is particularly suitable for use in disposable or single-use systems.

The invention relates to a double splitflow nano upgrade liquid phase chromatogram online desalting, enrichment and mass spectrum combination system which comprises a pump, a first splitter, a second splitter, a sample valve, a switching valve, a backpressure valve, a capillary tube separation column and a mass spectrometer, wherein, the pump, the first splitter, the sample valve, the second splitter, the capillary tube separation column and the mass spectrometer are connected in series in turn through pipelines; the split ports of the first splitter and the second splitter are respectively connected with the two inlets of the switching valve through the pipelines; moreover, the outlet of the switching valve is connected in series with the backpressure valve and then is communicated with a waste fluid pool through the pipeline. The system has the advantages that: during the sampling and separation of sample, the system has less pressure fluctuation; with small pre-column dead volume, the system overcomes the gradient delay effect caused by large-volume sampling adopted in the prior nano upgrade liquid phase separation system; with excellent separation repeatability, the system is particularly suitable for gradient separation; meanwhile, the system can be used in online desalting, enrichment and mass spectrum combination of sample with high salinity and low concentration; moreover, the system has a simple structure, convenient operation and easily realized automation.

The invention relates to a manually-actuated metering pump of simple design, which is intended for a rigid container. The inventive metering pump is of the dual valve type, comprising a lower inlet valve and an upper ejection valve which are disposed at the input and output respectively of a metering chamber which is slidably mounted on the lower valve. Moreover, said lower valve is fixed to a hollow tube which communicates with the inside of the container. The invention can be used for dispensing fluid products.

In a scroll compressor, a revolution scroll lap 1a stands on one of surfaces of a revolution lap support disk 1b of a revolution scroll member 1, and a revolution disk 2 is connected to the other surface. The revolution disk 2 is formed at its center with a revolution shaft support hole 2b into which an eccentric shaft 4a is to be inserted. An outer periphery of the revolution shaft support hole 2b is formed with a crankshaft support hole 2a into which an eccentric shaft 5e is to be inserted. The eccentric shaft 5e restrains the rotation of the revolution scroll member 1. The revolution scroll lap 1a and the revolution lap support disk 1b are integrally formed of synthetic resin. The revolution disk 2 is made of metal. The revolution shaft support hole 2b and the crankshaft support hole 2a are integrally formed together. With this configuration, the thermal deformation of revolution scroll member 1 is suppressed, and wear and mechanical loss caused by contact between laps are prevented.

The invention discloses a small constant interfacial area extraction cell for extraction kinetics research. The constant interfacial area extraction cell comprises an upright post, a driving mechanism, an upper positioning plate, a lower positioning plate, an organic phase stirring paddle, an aqueous phase stirring paddle, a liquid bath tray, a central baffle plate, a bottom plate and so on, wherein the upright post is fixed on the bottom plate; the driving mechanism, the upper positioning plate, the lower positioning plate and the liquid bath tray are fixed on the upright post; a liquid bath is fixed on the liquid bath tray; the organic phase stirring paddle and the aqueous phase stirring paddle are arranged inside the liquid bath; the driving mechanism drives the organic phase stirring paddle and the aqueous phase stirring paddle to rotate respectively; the liquid bath provided with a liquid bath cover is cylindrical and is divided into an inner layer and an outer layer; a constant temperature water jacket is arranged between the inner layer and the outer layer; a baffle ring is designed on an interface of two phases in the liquid bath and consists of an interfacial baffle plate and a central baffle plate; the inner wall of the liquid bath is formed by overall mill processing; and the bottom and the interfacial baffle ring of the liquid bath adopt chamfered or circular design. By adoption of the design, the liquid bath is convenient to clean as the inner wall of the liquid bath is provided with no combined gap , and simultaneously dead volume is eliminated, and small constant interfacial area extraction cell is suitable for radioactive experiments.

The invention discloses an ultrahigh-pressure high-temperature experimental back-pressure valve which mainly comprises an upper valve body, a lower valve body, an ultrahigh-pressure gas chamber, an alloy diaphragm, a horizontal fluid channel, a vertical fluid channel, a central hole and a valve needle. The alloy diaphragm 4 is located between the upper valve body 1 and the lower valve body 1 and forms a multistage combined soft seal 10 with the upper valve body and the lower valve body, the ultrahigh-pressure gas chamber 3 is located in the upper valve body and is connected with a back-pressure pipeline end 9, and a through hole 11 is formed between the ultrahigh-pressure gas chamber and the horizontal fluid channel 5; the central hole 7 is formed in the intersection point of the horizontal fluid channel 5 and the vertical fluid channel 6 which are located in the lower valve body, the central hole extends upwards to the ultrahigh-pressure gas chamber, the valve needle 8 is located in the central hole, the top of the valve needle is machined into a first threaded rod 15, the needle tip of the valve needle 8 is sealed in a sealing pad 14 at the tail end of the central hole 7, and the central hole moves downwards to be connected to a sample line end 12. The ultrahigh-pressure high-temperature experimental back-pressure valve is high in sealing performance, high in pressure control, high in stability and free of dead volume, and the gap in the prior art is filled up.

A system and method for facilitating a chemical reaction is provided. The system can have an electrically conductive member. The electrically conductive member is capable of holding a chemical mixture. The electrically conductive member is directly coupled to a power source and is heated when the power source is on. When a chemical mixture is within the electrically conductive member and the power source is on, the chemical mixture is heated such that a chemical reaction can occur.

A fuel injector for fuel injection systems of internal combustion engines includes a valve needle and a valve-closure member mechanically linked to it, which cooperates with a valve-seat surface situated in a valve-seat member to form a sealing seat, and at least one swirl-producing element which is situated upstream from the sealing seat in the valve-seat member. One or more swirl channels which are open toward the upstream side of the valve-seat member are incorporated into the upstream side of the valve-seat member as a swirl-producing element.

The invention provides an overburden pressure system for three-dimensional model, comprising a barrel body, a piston disposed in the barrel body and a sand filling layer connected with the piston; the piston is composed of a square piston and a round piston; a capsule chamber is disposed between the piston and the barrel body; the capsule chamber is located at the junction of the square piston and the round piston; one side of the barrel body is provided with a round overburden pressure chamber; the capsule chamber is connected with a capsule chamber injecting opening; the round overburden pressure chamber is connected with an overburden pressure chamber injecting opening. The invention has the following technical effects: 1, a round overburden pressure chamber is provided, a hydraulic pump is used for injecting liquid and pressurizing the overburden pressure chamber; the piston is used for pressing the sand filling layer, so that the sand filling layer has the overburden pressure function, then then experimental precision and accuracy are ensured; 2, four blocks of semilunar capsule chambers (rubber material) are arranged between the piston and the barrel body, when the piston is pressed down, liquid is injected into the capsule chamber by the capsule chamber injecting opening; the shape of the rubber capsule is changed by the liquid pressure, so as to fill the gap and remove the dead volume between the barrel body and the piston.

The invention relates to an interface for microcolumn liquid chromatogram and mass spectrum, in particular to a capillary monolithic column spray needle. The capillary monolithic column spray needle comprises a capillary pipe, the capillary pipe is filled with monolithic material, a needle head used for electron spray extend at one end of the capillary pipe to form a capillary monolithic column spray needle, then the capillary monolithic column spray needle is connected to the tail end of a capillary separating column through a two-way pipe and the voltage used for electron spray is applied to the two-way pipe. The invention has the main advantages that because the dead volume existing in an electron spray needle in the combined use of the microcolumn liquid chromatography and the mass spectrum and the electron spray needle is eliminated, the capillary monolithic column spray needle eliminates the disturbance and the mixing action of the dead volume to the microcolumn liquid chromatography is eliminated, greatly enhances the separating capacity and the repeatability of the microcolumn liquid chromatography and represents superior performance to the commercial capillary electron spray needle in the quantitative proteomics; and in addition, because the monolithic column material exists in the capillary monolithic column spray needle, the problem that the electron spray needle is easy to be blocked during the separation and the analysis process is solved and the service life of the electron spray needle is greatly prolonged.

The invention relates to an electrically-controlled dropwise adding system for inductive gravity metering. The electrically-controlled dropwise adding system comprises a liquid storage flask (1), a liquid discharge tube (2), an electromagnetic valve (4), a titrating head (6), a wireless transmission module, a titrating cup (9), a balance (10) and a controller (12); the liquid storage flask (1) is connected with the titrating head (6) through the liquid discharge tube (2) and the electromagnetic valve (4), the titrating head (6) is arranged on the titrating cup (9), the wireless transmission module is fixed to a lid of the titrating cup (9), the titrating cup (9) is arranged on the balance, and the controller (12) is connected with the electromagnetic valve (4), the balance (10) and the wireless transmission module separately. Compared with the prior art, the electrically-controlled dropwise adding system has the advantages of being simple in structure, low in failure rate, higher in precision, small in dead volume, capable of saving a standard titrating solution for washing and replacing and the like.

The invention relates to an interface unit containing capillary electrophoresis of a hollow-fiber membrane and chemoluminescence combination, which at least comprises a hollow-fiber membrane. The hollow-fiber membrane is arranged between an injection port of a capillary and a detection window, both ends of the hollow-fiber membrane are respectively inserted into a Teflon tube, and the edges for connecting the Teflon tube with the hollow-fiber membrane are bonded and sealed by epoxide resin; chemiluminescence reagent is mixed with a sample through the hollow-fiber membrane, the chemiluminescence reaction is carried out, and a chemiluminescence detector is used for further detection. The interface unit has the advantages of high column efficiency and detection sensitivity, simple structure,convenient operation, easy control and wide application range.

The invention discloses a composite electrical steel material which is characterized by comprising two magnetic materials, namely an amorphous soft magnetic alloy material and an electrical steel base material, wherein the amorphous soft magnetic alloy material is compounded to two surfaces or one surface of the electrical steel base material; and the amorphous soft magnetic alloy material is metal glass. According to the composite electrical steel material, the amorphous soft magnetic alloy material and the electrical steel base material are compounded; due to high insulativity and high rust resistance of the layered amorphous soft magnetic alloy material, the insulation and rust resistance functions of an organic, inorganic or semiorganic coating layer coated on the surface of the conventional electrical steel material are replaced, so that the material completely gets rid of the problem of low environment friendliness during production, coating and use of an organic and/or inorganic insulative coating; furthermore, since the amorphous soft magnetic alloy material has high magnetic performance, the ineffective volume of the conventional insulative coating layer is eliminated, the stacking coefficient of the material is effectively increased; and the magnetic performance of the material is greatly improved.

The invention relates to a dead-volume-free rocker arm two-way electromagnetic valve which comprises a valve body, a valve seat, a fluid inlet, a fluid outlet, a rocker arm and a diaphragm. The valve seat covers the valve body, the valve body, the valve seat, the fluid inlet, the fluid outlet and the diaphragm jointly form a flow channel for fluid circulation, and a flow sweeping structure capable of eliminating the fluid dead volume is arranged on the flow channel. The flow sweeping structure comprises a first inclined surface and a flow guide wing, the first inclined surface is an inclined surface on the left part of the diaphragm and is close to the fluid inlet, the flow channel inclines upwards in the horizontal direction from the fluid inlet to the fluid outlet, and the fluid outlet is located in the farthest end of the flow channel; and the flow guide wing forms a flow guide structure for controlling fluid in the flow channel not to rotate so as to prevent formation of the dead volume. After the structure is adopted, the following effects can be achieved: the circulation condition of fluid in the valve is thoroughly changed, the dead volume in the valve is eliminated, the experiment accuracy and precision are improved, and the economic benefit and the experiment effect are very remarkable.

The invention relates to a capillary tube electrophoretic technique, in particular to a heart-cutting two-dimensional capillary electrophoresis on-column electrochemical device and application thereof. The device comprises a capillary column, an electrochemical detection pool, an electrochemical detector and a high-voltage power supply, wherein a segment of polyimide coating is removed from a position with a distance of 0.5 to 3 cm away from the outlet end of the capillary; the capillary wall with the coating removed is corroded into a porous shape by using hydrofluoric acid; a layer of cellulose acetate pulp is coated on the position uniformly to form a field insulating joint which can only allow current to pass through and avoid leakage of solution; and a working electrode, an auxiliary electrode and a reference electrode are inserted into the electrochemical detection pool. The application comprises the following steps of: separating a complicated sample in first dimension buffer solution; when the working electrode detects a signal of a target component, applying pressure at a detection end to drive the target component to the inlet end of the capillary; allowing second dimension separation buffer solution to enter the capillary from the tail end of the capillary; and further performing separation and detection on the target component in the second dimension separation buffer solution. The device has the advantages of high column efficiency of heart-cutting two-dimensional capillary electrophoresis separation, no loss of samples and suitability for on-line separation and detection of target components in complicated samples.