465 results about "Gas exchange" patented technology

The invention discloses a straw feed fermentation treatment control system and method, particularly relates to the technical field of production control, and is used for solving the problem of insufficient identification and regulation of an imbalance phenomenon in a straw fermentation pile caused by non-uniform gas diffusion in the existing fermentation process. The method comprises the following steps: acquiring environmental parameters of a fermentation heap, performing three-dimensional gas concentration field reconstruction processing, identifying a layered air mass region in combination with a fuzzy clustering algorithm, measuring heap pressure distribution and deformation characteristics, analyzing a heap body structure abnormal region, and marking a risk analysis region; through a three-dimensional tensor model and a fractal analysis model, the time dependency and the gas diffusion equilibrium degree of the gas exchange and metabolism process are evaluated respectively, and finally fermentation pile structure parameters and ventilation device operation parameters are dynamically adjusted based on a closed-loop control system; through accurate region identification and a dynamic regulation and control mechanism, the uniformity of the fermentation process and the quality consistency of the straw feed are remarkably improved.

The invention discloses a microgravity culture dish and a using method, and relates to the technical field of biological culture devices.The microgravity culture dish comprises a culture dish body and a culture dish cover, the culture dish body comprises a culture bottom shell and a sealing cover, a breathable separation ring is arranged in the middle of the culture bottom shell, and a culture area is arranged on the inner side of the breathable separation ring; a humidifying area is arranged on the outer side of the breathable separation ring, and a combined filter membrane is arranged on the inner side of the breathable separation ring; a culture medium channel is arranged on the side face of the culture bottom shell, a sealing plug is arranged on the culture medium channel, the culture bottom shell is provided with a gas exchange channel, and a water absorption body is arranged in the humidification area. Meanwhile, the invention discloses a using method based on the microgravity culture dish, a liquid dynamic exchange function and a gas exchange function are achieved at the same time in a suspension culture mode, cell development morphology observation and judgment can be effectively improved, and evaporation of a culture medium is inhibited in a humidification area. A partitioning mechanism is arranged, and culture of different regions is carried out according to the size of an actual sample.

The invention provides an NMP (N-Methyl Pyrrolidone) purification process based on an NMP rectification system, the process is completed by matching a tail gas desorption tower, the space in the tower is divided into an adsorption bin and a desorption bin by arranging a middle box body, two groups of adsorption devices capable of alternately entering the two bins are mounted, and automatic switching of the adsorption devices is realized by utilizing a driving mechanism; when the adsorption efficiency of one group of adsorption devices is reduced, the adsorption devices are automatically transferred to the desorption bin for regeneration treatment, meanwhile, the other group of adsorption devices enter the adsorption bin to continue working, and in the desorption process, low-pressure saturated steam and hot nitrogen are adopted for purging, so that residual moisture is effectively removed, and the adsorption activity is recovered; compared with the prior art, the process has the advantages that gas exchange in the adsorption and desorption process is reduced, the sealing performance and the air pressure balance control capability of the system are improved, the process ensures continuous production, meanwhile, the energy consumption and the discharge pressure are remarkably reduced, and the NMP purification efficiency and the product quality are improved.

The invention provides a gas meter which is assembled on a gas pipeline and comprises a pressure detection module, a component detection module and a control module. The pressure detection module is used for detecting the pressure in the gas pipeline to obtain a pressure value; the component detection module is used for detecting the gas concentration in the gas pipeline to obtain a concentration characterization value capable of characterizing the gas concentration; the control module is in communication connection with the pressure detection module and the component detection module, and receives a pressure value sent by the pressure detection module and a concentration characterization value sent by the component detection module; the control module is further used for sending an alarm signal, and the alarm signal is generated when the concentration characterization value exceeds a preset range and the pressure value is lower than a preset pressure threshold value. According to the gas meter provided by the invention, the gas leakage condition and the gas exchange condition can be distinguished, so that the preset range of the concentration characterization value can be narrowed, whether air is mixed into the gas pipeline or not can be detected in time, and the gas use safety is improved.

The invention discloses an enhanced denitrification method and device for a constructed wetland with a high-void-ratio filler, and aims to create favorable conditions for deep nitrification by screening light materials and constructing a high-low-high gradient resistance layer and inducing flow velocity differentiation to form an oxygen concentration fluctuation zone. Function switching type microorganisms with nitrification-denitrification bidirectional conversion capacity are cultured, and a seasonal flora switching mechanism and a complementary symbiotic network are established to adapt to annual temperature change; multi-point distributed water supply is designed to form a river branch type water flow path, and bionic water flow distribution is achieved; the periodic change of the water level of pulsating water inlet is used for driving gas exchange in the filler to form a tidal breathing effect, and deep oxygen supply can be realized without mechanical aeration; and real-time monitoring is carried out based on an intermittent operation time table, and operation parameters are dynamically optimized. According to the invention, the problems of limited oxygen transfer and seasonal performance fluctuation of the traditional constructed wetland are solved, and a technical scheme with low energy consumption and high stability is provided for nitrogen-containing wastewater treatment.

The invention relates to a dual-channel CO2 respiration monitoring device and system based on an intelligent sensor, and the device comprises a CO2 airway adapter which is used for carrying out gas exchange on CO2 discharged by membrane lungs; the hose is used for being matched with the membrane lung exhaust connector to convey CO2 exhausted by the membrane lung; the membrane lung exhaust connector is used for being matched with a hose to convey CO2 exhausted by the membrane lung; based on the dual-channel CO2 respiration monitoring system, dual-channel CO2 respiration monitoring is carried out through an intelligent sensor arranged in the dual-channel CO2 respiration monitoring system; the membrane lung is connected with the membrane lung exhaust connector and the dual-channel CO2 respiration monitoring system based on the intelligent sensor and is used for simulating the lung to perform gas exchange; and the breathing machine is connected with the dual-channel CO2 breathing monitoring system based on the intelligent sensor and is used for supporting natural breathing of the user. According to the invention, the efficiency and accuracy of monitoring the CO2 emission concentration of the membrane lung and the CO2 emission concentration of the breathing machine in real time according to the change condition of CO2 breathing are improved.

The invention belongs to the field of membrane materials, and particularly relates to a permeable membrane with a COF layer growing on the surface and a preparation method and application of the permeable membrane. According to the invention, aldehyde monomers are introduced into a membrane casting solution for blending, and a porous basement membrane with aldehyde groups on the surface is obtained through a phase inversion method; then, the aldehyde group porous substrate membrane is put into an acid reaction solution containing aldehyde monomers and sufficient amine monomers containing guanidine groups in an in-situ growth mode to obtain the porous permeable membrane with the multi-amino COF growing on the surface, the porous substrate guarantees good gas permeability, and the thin and compact surface also guarantees that the membrane does not leak liquid for a long time. In addition, enrichment of amino groups on the surface also promotes affinity of the material to carbon dioxide, and gas exchange in ECMO application is facilitated. In addition, the COF layer grown on the surface also improves the protein adhesion resistance of the porous basement membrane.

The invention relates to a bioreactor (100) adapted for culturing animal cells, comprising: a vessel (110) defining a cultivation volume (111); at least two gas exchange devices (120) protruding in the vessel (110), each gas exchange devices (120) having a gaseous exchange surface (121) in the vessel (110); and at least one media inlet (130) and at least one media outlet (135), said media inlet (130) and outlet (135) being configured to operate simultaneously. The invention also relates to methods, cell biomass obtained from these methods and edible food products including this biomass.

The utility model provides an organ chip and a lung gas exchange model, the organ chip comprises a culture membrane and actuating membranes, a culture chamber and at least two actuating chambers are formed in the organ chip, the culture chamber is divided into a first culture chamber and a second culture chamber by the culture membrane, and the second culture chamber and each actuating chamber are separated by the actuating membranes. The actuating chambers define a deformable region of an actuating membrane, the at least two actuating chambers are arranged equidistantly spaced circumferentially around the axis of the culture chamber, the actuating membrane located in the actuating chamber being deformable in response to a change in pressure of the actuating chamber to conduct a change in pressure between the actuating chamber and the second culture chamber, the culture membrane is deformable in response to a change in pressure of the second culture chamber. The organ chip can simulate the physiological change of the pulmonary alveoli in the breathing process more truly.

The invention discloses a compensation method and system for continuously, rapidly and accurately measuring the radon concentration in air, and the method comprises the steps: taking the number of nuclides in a measurement cavity at the initial moment of a current sampling period as an initial value, and obtaining a time-varying function of the number of nuclides in the measurement cavity in combination with a gas exchange and nuclide decay model; determining the theoretical total count of alpha particles in the current measurement period, and establishing a relational expression between the count of the alpha particles and the number of nuclides; based on the relational expression and the actual measurement count, the number of environmental radon atoms is obtained, and the radon concentration is calculated in combination with a radon decay constant; and finally, combining the number of radon atoms at the current sampling point and a model containing gas exchange and nuclide decay to obtain the nuclide number at the end of sampling, taking the nuclide number as the initial state of the next sampling period, switching the sampling points, and repeating the steps to realize continuous, rapid and accurate sampling. According to the method, through loop iteration, the balance waiting time is effectively saved, and continuous, rapid and accurate measurement of the radon concentration in the environment by a single radon measuring instrument is realized.

The invention provides a high ventilation method for maintaining equal carbonic acid through exogenous CO2 gas and a breathing device. Belongs to the technical field of gas exchange. The method comprises the steps that physiological monitoring data of a patient are collected in real time, and meanwhile parameters of a breathing machine are obtained; inputting the collected data into a pre-trained time sequence prediction model; performing data fusion based on the EtCO2 predicted value, the currently actually measured physiological data and the static parameters of the patient to form a comprehensive evaluation result; and through a control algorithm, an incremental adjustment instruction of the exogenous CO2 supplementary flow is obtained through calculation based on the comprehensive evaluation result. The CO2 demand is estimated in real time through a dynamic prediction model, static estimation is replaced, and the control accuracy and the response speed are remarkably improved; through a multi-modal data fusion technology, dynamic and static physiological parameters are comprehensively applied, so that a control strategy can better reflect the individualized physiological status of a patient.

The invention provides a PMP polymer breathable film and a preparation method thereof. The preparation method specifically comprises the following steps: step 1, PES particle activation; 2, preparing a GO dispersion liquid and a polymer solution; 3, mixing the activated PES particles with a GO dispersion liquid and a polymer solution in sequence for modification; 4, preparing a spinning solution; 5, spinning to form a film; step 6, carrying out ultraviolet lithography; 7, sterilizing after a potential regulator and irradiation; through material compounding, gradient pore-foaming agent design, bionic modification and multi-process cooperation (plasma treatment, ultraviolet crosslinking and micro-channel photoetching), the air permeability, the mechanical strength, the biocompatibility and the structural controllability are obviously superior to those in the prior art. The innovation point of the composite membrane is that efficient gas exchange, long-term stability and low biological risk can be realized by directly aiming at the defects of the traditional PMP membrane, especially in the fields of artificial lung and hemodialysis.

The utility model belongs to the technical field of agricultural product preservation, and particularly relates to a lotus root anti-brown spot preservation container which comprises a base, a splicing bin and a bin cover, a filling bin filled with natural antioxidants and microbial inhibitors is arranged in the splicing bin, and the lotus root anti-brown spot preservation container can inhibit the activity of phenol oxidase, prevent brown spots, inhibit the growth of mould and bacteria and delay lotus root decay; a sponge mat is arranged at the bottom of the container to absorb excessive moisture, keep dry and further prevent mould breeding; a microporous membrane is arranged between the splicing bin and the bin cover, gas exchange is allowed, microorganisms are prevented from entering, the concentration of oxygen and the concentration of carbon dioxide are controlled, and the preservation effect is enhanced; the quick-release lock catch structural design enables the container to be mounted and dismounted more conveniently and quickly, the air holes are formed in the partition pieces, air circulation is ensured, a suitable storage environment is provided, and the overall design is efficient, environmentally friendly and easy and convenient to operate.

The invention belongs to the technical field of biomedical materials, and particularly relates to a poly-4-methyl-1-pentene (PMP) gas-blood exchange membrane for an extracorporeal membrane oxygenation (ECMO) system, which realizes a long-acting antithrombotic function through a bionic interface construction technology. The invention aims to provide a bionic antithrombotic PMP gas-blood exchange membrane based on zwitter-ion gradient grafting, and through material and process innovation, the following problems existing in a traditional ECMO gas-blood exchange membrane: an antithrombotic coating is easy to fall off, and the long-term effect is insufficient; the risk of blood injury caused by dependence on heparin or anticoagulants; and the surface modification process destroys the membrane pore structure and air permeability.

The utility model discloses a scavenging valve and an atomizer, and the scavenging valve comprises: a support member provided with a cavity; a ventilation channel is formed in the cavity and comprises a first channel and a second channel; the switch piece is arranged in the cavity; the switch piece is provided with a first lip edge part and a second lip edge part; in a natural state, the first lip edge part and the second lip edge part are configured to be attached to the supporting piece so as to close the first channel and the second channel; in the ventilation state, one of the first lip edge part and the second lip edge part is attached to the supporting piece, the other lip edge part is at least partially separated from the supporting piece, then one of the first channel and the second channel is selected to be open, and the other lip edge part is kept closed. The two ends of the scavenging valve are communicated through the scavenging channel, and the movable part of the switch piece can be used for separating or communicating the scavenging channel, so that the scavenging valve can be communicated with the liquid storage cavity and the outside of the liquid storage cavity, pressure balance is realized through gas exchange, and the leakage risk and the dry burning risk of the aerosol matrix are reduced.

The invention relates to an oxygenator, which comprises a shell, a blood inlet, a blood outlet, a water inlet, a water outlet, an air inlet and an air outlet, wherein the upper part of the shell is provided with a blood inlet; the lower part of the shell is provided with a blood outlet; the top of the shell is provided with a water inlet and a water outlet; the oxygenation temperature changing assembly is vertically arranged in the shell and sequentially comprises a mandrel, a temperature changing film, a partition plate and an oxygenation film from inside to outside, the temperature changing film is communicated with the water inlet and the water outlet, the oxygenation film is communicated with the air inlet and the air outlet, the blood inlet end of the mandrel is communicated with the blood inlet, and the blood outlet end of the mandrel corresponds to the upper portion of the temperature changing film; wherein blood reaches the variable-temperature film from the blood inlet through the mandrel, is diffused towards the periphery by taking the mandrel as the center, obliquely penetrates through the variable-temperature film, the partition plate and the oxygenation film from top to bottom and then flows out of the blood outlet; and the blood inlet and the blood outlet are positioned on the same vertical line. According to the oxygenator, blood uniformly penetrates through the oxygenation membrane for gas exchange, the flow field is uniform, and the gas exchange utilization efficiency of the oxygenation membrane is high.

The breast pump comprises a one-way valve, a flexible breast cover and a negative pressure forming unit, the breast cover comprises a shoulder ring body, an assembly ring body and a horn cover body, the assembly ring body integrally extends towards one side from the inner edge of the shoulder ring body, and the horn cover body is connected with the assembly ring body. The horn cover body integrally extends in the opposite direction from the outer edge of the shoulder ring body, the negative pressure forming unit comprises a supporting shell and a negative pressure forming part and is provided with a negative pressure cavity, the negative pressure forming part is installed on the supporting shell so that the negative pressure cavity can be formed between the negative pressure forming part and the supporting shell, the supporting shell is provided with a gas exchange channel, and the gas exchange channel is communicated with the negative pressure cavity. The air exchange channel is communicated with the negative pressure cavity, the negative pressure forming part is provided with a milk sucking cavity, an assembling opening and a milk discharging channel, the assembling opening and the milk discharging channel are respectively communicated with the milk sucking cavity, the one-way valve is arranged on the negative pressure forming part so as to selectively open and close the milk discharging channel, and the assembling ring body is assembled on the assembling opening.

The utility model discloses a blood extracorporeal circulation device, which belongs to the technical field of blood extracorporeal circulation equipment and comprises an inner tube and an outer tube, the inner tube and the outer tube are integrally nested, one end of the outer tube is connected with an air inlet tube, the air inlet tube is communicated with oxygen inlet equipment, and the other end of the outer tube is connected with an air outlet tube. A temperature changer and a flow speed controller are connected between one end, far away from the air outlet end, of the outer pipe and the oxygen inlet equipment; one end of the inner tube is a liquid inlet end for transporting blood, the other end of a blood inlet of the inner tube is a liquid outlet end, and the liquid outlet end is connected with a temperature sensor, an oxygen saturation sensor, a blood pump and a microembolus filter; the part, in the outer pipe, of the inner pipe is made of a gas exchange membrane material, and the liquid inlet end of the inner pipe is opposite to the gas inlet pipe of the outer pipe. The blood temperature rising process is safer, meanwhile, in the blood temperature rising process, the oxygen saturation index in the blood can be directly adjusted, the blood oxygen value is simple, convenient and controllable on the basis of convenient temperature rising, temperature control and oxygen saturation of in-vitro blood circulation are carried out at the same time, and operation is easy and safe.

A first chamber and a second chamber are formed between the two ends, in the first direction, of a medium exchange module and a shell, a gas inflow cavity and a heat medium inflow cavity are formed between one end, in the second direction, of the medium exchange module and the shell, and a gas outflow cavity and a heat medium outflow cavity are formed between the other end and the shell. Two ends of the first / third gas exchange pad are respectively communicated with the first and second chambers, two ends of the second gas exchange pad are respectively communicated with the gas inflow / outflow cavity, and two ends of the heat exchange pad are respectively communicated with the heat medium inflow / outflow cavity. The first cavity is communicated with the gas inflow cavity, the second cavity is communicated with the gas outlet, the gas inflow cavity is communicated with the gas inlet, the thermal medium inflow cavity is communicated with the thermal medium inlet, and the thermal medium outflow cavity is communicated with the thermal medium outlet.

The invention belongs to the technical field of organoid culture, and particularly relates to a pulmonary alveolar organoid with an endogenous vascular network and a construction method of the pulmonary alveolar organoid. Aiming at the problems that mesoderm and endoderm are difficult to induce at the same time, the operation process is long, the difficulty is high and the like when a vascularized alveolar organ is constructed by an existing method, the invention provides the construction method of the alveolar organ with the endogenous vascular network. The method comprises the following steps: simultaneously and directionally inducing and differentiating human induced pluripotent stem cells (hiPSC) into fixed endoderm and mesoderm, anterior intestine endoderm, abdominal side anterior intestine endoderm and lung progenitor cells by adopting a one-step method, and promoting endothelial cell proliferation in an endogenous induced differentiation process through a specific growth factor combination. A functional vascular network is formed; and vascularized alveolar organs are induced to be generated. According to the invention, a qi-blood barrier structure in which vascular endothelial cells and pulmonary epithelial cells are tightly connected is successfully reproduced, the gas exchange function of lung tissues can be simulated, and a new way is provided for construction of vascularized alveolar organs.

A closed cell culture device with high gas permeability and a method. The culture device comprises: a base; a reactor housing, which is arranged above the base and is connected to the base to form a sealed cavity; a gas exchange assembly, which is arranged above the base and is in communication with the sealed cavity; a first liquid exchange assembly, which is arranged above the reactor housing and is connected to the reactor housing; and a second liquid exchange assembly, which is arranged on the side wall of the reactor housing and is in communication with the sealed cavity. A filter is provided in the first liquid exchange assembly, a filter membrane is provided in the filter, and the filter membrane is built in the filter in a folded or stacked manner; and the gas permeation rate of the filter is 5-30 L / min, and the membrane area of the filter membrane is larger than 2700mm 2. The method solves the problem that a bottom silicone breathable membrane will bulge due to negative pressure when a culture medium is extracted, and the problem of a complicated apparatus caused by discharging the culture medium in a positive pressure manner.

A system for cleaning, zeroing, and preventing air pollution in indoor space includes several gas detection devices, a central control monitoring device, and several gas exchange and filtration devices. The gas detection devices detect and output indoor and outdoor air pollution data. The central control monitoring device receives the outdoor and indoor air pollution data to perform an intelligent computation and comparison, locate an air pollution location in the indoor space, and transmit a control command intelligently. Each of the gas exchange and filtration devices is combined with a smart switch for the control command to control the gas exchange and filtration devices to be enabled, so that the air pollution is filtered and exchanged by the gas exchange and filtration devices, thereby allowing the indoor air pollution data detected by the gas detection devices in the indoor space to be a safety detection value.

The application discloses an active closed one-way valve, a gas exchange mechanism, a gas exchange insole and a shoe sole, and relates to the technical field of shoe structure. The active closed one-way valve comprises a valve body, an end plate arranged at the exhaust end of the valve body, and an elastic cap covering the end plate. A convex part is arranged on the outer end surface of the end plate, and air holes are distributed around the convex part. An exhaust hole corresponding to the position of the convex part is arranged on the elastic cap. The elastic cap is pressed against the convex part and blocks the exhaust hole by the convex part. The elastic cap can be deformed outward to move away from the convex part under the pressure of the outward exhaust gas flow of the one-way valve, so as to open the exhaust hole. The application has the advantages of simple structure, easy implementation, low failure rate and better durability. Moreover, the elastic cap is pressed against the convex part and fixed around the convex part. The gas flow in the valve body needs to accumulate to a certain pressure to break the elastic cap and flow out from the exhaust hole. In this way, the gas flow can be accumulated and pressurized in the valve body, so that the finally sprayed gas flow of the one-way valve is more concentrated, and the flow rate is faster.

The utility model relates to the field of experimental animal fixing instruments, in particular to a mouth-nose inhalation administration experimental animal fixing device and an administration system thereof, and particularly relates to an experimental animal fixing device used for being combined with an administration device. An experimental animal fixing device is used for being communicated with a medicine supply device so as to detect the characteristics of experimental medicine through an experimental animal and comprises a shell, the shell comprises a conical part with a conical cavity and a cylindrical part with a cylindrical cavity, and the conical cavity and the cylindrical cavity form a containing cavity for containing the experimental animal; the size of the end, away from the cylindrical part, of the conical part is smaller than that of the end, close to the cylindrical part, of the cylindrical part, and a communicating hole communicating with a medicine supply device is formed in the end, away from the cylindrical part, of the conical part; the propelling unit is adjustably arranged in the cylindrical cavity so as to adjust the space of the accommodating cavity; the adsorption cabin is arranged at the position, corresponding to the expiration part of the experimental animal, of the shell, and the containing cavity achieves gas exchange with the outside through the adsorption cabin.

The invention discloses a trace water vapor removal device and method based on a membrane permeation technology, and relates to the technical field of online total sulfur analysis, the trace water vapor removal device specifically comprises a membrane drying assembly, the membrane drying assembly comprises a through exchange cavity, a top cover and a bottom cover, the through exchange cavity serves as the center, the top cover is fixed to the top of the through exchange cavity through a bolt, and the bottom cover is fixed to the bottom of the through exchange cavity through a bolt; a bottom cover is fixed at the bottom; an intelligent adjustment and efficient dehydration structure is adopted, the humidity of reaction gas is monitored in real time through a humidity sensor, data are fed back to an external controller, and intelligent linkage adjustment of the opening size of the movable ventilation pipe and the power of the circulating pump is achieved; the dynamic regulation and control mechanism can automatically optimize the flow rate of purge gas and the water-gas exchange area according to the actual humidity change, and it is ensured that the efficient and stable dehydration effect can be achieved under different working conditions.

Provided are methods and systems for measuring lung function, such as shunt and deadspace, using pulmonary gas exchange in management and treatment of pulmonary diseases including COVID-19.

The present invention relates to a method and apparatus for exchanging gas between two exchange media using an exchange chamber (1) disposed within the housing of an exchange unit, wherein the exchange chamber (1) is divided into two chamber regions by at least one membrane (2), in which the first side of the membrane (2) is in contact with the first exchange medium in the first chamber region, and the second side of the membrane (2) is in contact with the second gaseous exchange medium in the second chamber region, the first chamber region having a connection for the first exchange medium, the first chamber region being incorporated into a first conduit (3) by this connection, and the first exchange medium being passed through the first chamber region using the first conduit. The second chamber region has a connection for a second gaseous exchange medium, and by this connection the second chamber region is incorporated into the second conduit (4), and the second exchange medium can be guided through the second chamber region using the second conduit, and the gas to be exchanged can be transported across the membrane (2) by diffusion, and the apparatus has a pressure generator (9a), and the pressure generator (9a) can be used to generate a pressure difference of at least 10 mmHg of the second exchange medium relative to the ambient atmospheric pressure in the second chamber region, and at least one membrane (2) is permeable to diffusion with respect to the gas to be exchanged, but impermeable to convection.

The invention discloses a gas exchange device in front of a sample introduction cone of an inductively coupled plasma mass spectrometer, the gas exchange device in front of the sample introduction cone is arranged outside an ICP torch tube in a sleeving manner, and the gas exchange device in front of the sample introduction cone is mounted on a partition plate around the sample introduction cone; the sample injection cone front gas exchange device comprises a porous breathable layer and a shell; an argon inlet is formed in one end, close to the sample introduction cone, of the shell; one end, far away from the sample introduction cone, of a space between the porous breathable layer and the ICP torch tube is opened and is communicated with the atmosphere. According to the invention, the environmental gas components in the space between the ICP torch tube and the mass spectrum interface device are exchanged into the preset clean gas, so that the sample ionization process is not interfered by the environmental air components, a lower noise baseline is obtained, and meanwhile, the generation of environmental component ions such as nitrogen oxide ions which possibly interfere mass spectrum analysis is reduced; the sensitivity of mass spectrometry detection and the environment anti-interference capability are improved.

The utility model discloses a valve and a charging device. The valve comprises a driving part and a connecting part connected with the driving part. One end, far away from the connecting part, of the driving part is inwards concavely provided with a ventilation cavity extending into the connecting part. A ventilation groove communicating with the ventilation cavity is formed in the side wall of the connecting part, and a first screw joint part is arranged on the side wall of the connecting part. The valve can ensure the air exchange between the interior of the charging device and the exterior of the charging device, and ensures the sealing performance.

A method for enabling gas exchange and chemical reactions with one or more liquid streams contained in a reactive process vessel are provided. One or more exchange layers within the process vessel can be composed of both collector media and releaser media. The exchange layers allow elements to facilitate increased performance of vessel operations by promoting gas component mixing and diffusion. Improved rates of gas component exchange mean less coking and more gas components available for reaction.