5994 results about "Vacuum pump" patented technology

The invention relates to the technical field of rotational flow electro-deposition, in particular to a process for treating metal-containing waste liquid by adopting a rotational flow electro-deposition technology, which comprises the following steps: removing particulate matters from the metal-containing waste liquid through a filtering device, and then recycling metal from the filtered metal-containing waste liquid through a rotational flow electro-deposition device. The rotational flow electro-deposition device comprises an electrolytic tank body, an anode shell and a plurality of cathode columns rotating synchronously, waste liquid forms rotational flow under the action of a spiral diversion trench, and metal ions are efficiently deposited on the surface of a cathode. By adopting the spiral diversion trench and the synchronously rotating cathode column structure, the waste liquid forms rotational flow in the electrolytic bath, so that the electrodeposition area of the cathode is increased, the uniform deposition of metal ions is promoted, the metal recovery efficiency and purity are improved, the manual operation intensity is greatly reduced through the cooperative control of the motor, the electric cylinder and the vacuum pump, and the production cost is reduced. The automation level of the process is improved, and the maintenance time of the cathode column is shortened.

The invention discloses a PSA oxygen production and nitrogen recovery cooperative control method and system, and relates to the technical field of gas separation. The method comprises the following steps: establishing a dynamic multi-target evaluation function comprising a plurality of performance indexes such as air compressor energy consumption, vacuum pump energy consumption, oxygen purity and nitrogen recovery rate, and collecting pressure, temperature, gas components and flow data in an adsorption tower in real time; in the adsorption stage, based on the real-time data and the current oxygen demand, a first machine learning model is used for generating and executing a dynamic pressure adjusting strategy for the air compressor; in a desorption stage, predicting an optimal vacuum degree curve based on historical desorption data by utilizing a second machine learning model, generating a start-stop and pumping rate control strategy of the vacuum pump according to the optimal vacuum degree curve, and determining the recovery rate of the vacuum pump according to a comparison result of the real-time nitrogen concentration and a preset recovery concentration threshold value. And desorption airflow is controlled to enter the nitrogen recovery pipeline or be directly discharged through the valve.

The invention discloses a heat dissipation control method, device and system based on an array chip and a medium. The method comprises the steps that the basic valve opening degree is determined based on the temperature value of any partition and a valve opening degree mapping table; determining a target valve opening degree of each electric valve based on the basic valve opening degree and a spray coverage overlapping model, and sending the target valve opening degree to each electric valve; calculating a target total flow based on all target valve opening degrees, adjusting the rotating speed of a liquid supply pump through a frequency converter, and enabling a measured value of a flow sensor to be the target total flow; determining a target pressure value based on the saturation temperature of the cooling liquid, and adjusting the power of the vacuum pump or the three-way vacuum electromagnetic valve to enable the pressure value of the evaporation cavity to be the target pressure value. According to the method, three-layer linkage logic of partition precise temperature control, system flow coordination and global pressure setting is established, scattered devices are integrated into a whole, overall adjustment of the system level is achieved during heat dissipation control, instructions do not need to be sent frequently to control each valve, and the electric energy consumption of the system is reduced.

The embodiment of the utility model provides mural degerming equipment, which relates to the technical field of cultural relic protection, is used for being matched with a cleaning soft brush for use, and comprises a box body, a vacuum pump, a purification mechanism and a negative pressure pipe. The vacuum pump, the purification mechanism and the negative pressure pipe are all installed in the box body, the negative pressure pipe communicates with the vacuum pump through the box body, and the vacuum pump is used for generating negative pressure in a pipe cavity of the negative pressure pipe. The negative pressure pipe is provided with an adsorption end located outside the box body, and the adsorption end is used for facing the mural body to form a negative pressure area on the mural body. And the purification mechanism is used for purifying gas sucked through the adsorption end. By means of the design of the device, diffusion and propagation of bacterial colonies in the cultural relic cleaning process can be reduced, pollution to the environment is reduced, and the adverse effect on the health of operators during cultural relic maintenance is reduced.

The present application relates to a kind of heat shock flash evaporation loop lift membrane heat exchange test system, including heat exchange pipe, vapor-liquid separator, condenser, metering barrel, vacuum pump, liquid tank, heat shock heater, throttle valve, measurement and control system and high-speed camera, the upper outlet of heat exchange pipe is connected with the import of vapor-liquid separator, the secondary steam outlet of vapor-liquid separator is connected with the hot medium side import of condenser, the hot medium side outlet of condenser is connected with metering barrel and liquid tank respectively, the concentrated liquid outlet of vapor-liquid separator is connected with liquid tank, the outlet of metering barrel is connected with liquid tank, vacuum pump is connected with liquid tank, liquid tank is connected with heat shock heater, heat shock heater is connected with heat exchange pipe, throttle valve is arranged between heat shock heater and heat exchange pipe;High-speed camera is arranged in one side of heat exchange pipe.The present application can realize the experimental test to heat shock flash evaporation loop lift membrane heat exchange technology, and provide support for mechanism research, equipment optimization of heat shock flash evaporation loop lift membrane heat exchange technology.

The invention discloses a movable power generation type multi-section hinge vacuum cable-free mooring device which comprises a movable module, a base, a mechanical arm set, a vacuum adsorption assembly, a hydraulic power generation device and a sliding power generation device. An infrared sensing device is arranged on the base; the vacuum adsorption assembly comprises a vacuum chuck and a vacuum pump, the vacuum pump comprises a motor, a pump shell and a sealing cover, and two rotating pieces with opposite magnetism are embedded in the middle of a driving shaft of the motor; the sliding power generation device comprises a shell, a sliding block, a transmission shaft, a spring and a chain. The sliding block slides in the shell, and a spring is arranged between the sliding block and the shell; the top of the slide block is provided with a first toothed belt and the bottom is provided with a second toothed belt; a first ratchet, a first gear, a second ratchet, a second gear and a generator are arranged on the transmission shaft; a first stop assembly clamped into the first ratchet wheel is arranged on one side of the first gear, and a second stop assembly clamped into the second ratchet wheel is arranged on one side of the second gear. According to the invention, traditional mooring with cables is replaced by vacuum chuck adsorption, so that the collision risk is reduced and the cable breakage is avoided.

The invention discloses a hose feeding and oil sticking mechanism, relates to the technical field of industrial assembly, and is particularly suitable for assembly procedures of hoses such as hydraulic hoses, fuel pipes and cooling water pipes in whole vehicle manufacturing of new energy automobiles. Comprising a bottom plate, a feeding assembly, a clamping and moving assembly and an oil sticking assembly are arranged on the top face of the bottom plate, the feeding assembly is used for feeding of hoses, the clamping and moving assembly is used for clamping the hoses from the feeding assembly and moving the hoses to the oil sticking assembly, and the oil sticking assembly is used for oil sticking and oil removing of the hoses; the oil sticking assembly comprises a third supporting frame body, a sixth air cylinder, an oil disc, a fifth air cylinder, an oil immersion groove block, an oil removal cavity and a vacuum pump. According to the mechanism, automatic lubricating oil sticking and redundant lubricating oil removing operation of the hose can be achieved, automation of the whole process from bulk material feeding, positioning to oil coating is achieved, the production efficiency is greatly improved, meanwhile, splashing and waste of lubricating oil are avoided, cleanliness of the working environment is kept, and the mechanism is exquisite in structural arrangement, efficient and suitable for application and popularization.

The utility model relates to a high-voltage cable buffer layer ablation characteristic gas detection device which comprises a gas acquisition unit, a gas detection unit, a data processing unit and an alarm unit, the gas collection unit comprises a circulating pump, a vacuum pump, a sampling gas cylinder, a pressure sensor and a plurality of valves, the gas detection unit comprises two detection modules, the gas inlet pipe is connected with a first electromagnetic valve, then is connected with the sampling gas cylinder and is connected with the circulating pump through a second electromagnetic valve, and the circulating pump is connected with the two detection modules through an electromagnetic three-way switching valve. An outlet of the sampling gas cylinder is connected with a third electromagnetic valve, then connected with an inlet of a vacuum pump, connected with a fourth electromagnetic valve and then connected with two detection modules at the same time; the first detection module is composed of a gas concentration sensor, a temperature sensor and a humidity sensor, and the second detection module is a gas sensor array. The device can perform field detection on gas generated in the ablation process of the buffer layer of the high-voltage cable, so that potential faults of the cable can be found and early warned in time.

The invention belongs to the field of thin films, and particularly discloses an atomic layer deposition method and a thin film prepared through the atomic layer deposition method. According to the deposition method, the reaction cavity, the two input pipeline systems, the outlet valve and the vacuum pump in the atomic layer deposition system are used for controlling precursor pulse deposition and inert gas purging conditions in the atomic deposition process, and the film deposition state is improved; the efficiency of purging and removing substances and impurity residues such as a precursor and a reaction product thereof is improved, the problem that the quality of a deposited film is affected by the impurity residues in a reaction system or on the surface of a sample in the film deposition process is avoided, the uniformity and compactness of film deposition and the coverage rate and conformal rate of a film on the surface of a base material hole are improved, the defects of the film are reduced, and the yield is improved. And the method can be applied to a substrate with a high aspect ratio structure to deposit the film, so that the purpose of manufacturing a large-size complicated special-shaped structure device is achieved.

A system for detecting the presence of a wafer on a wafer handling robot. The system includes a robot having an end effector with a ledge portion having an opening; a vacuum pump; a conduit fluidly coupling the vacuum pump to the opening in the ledge portion; a pressure sensor located along the conduit to determine whether a measured pressure is within a target pressure range; and a wafer configured to be supported by the at least one end effector and spaced apart from the ledge portion by an air gap. When the wafer is supported by the at least one end effector in a proper position, the measured pressure is within the target pressure range. When the wafer is not supported by the wafer support structure or is supported by the wafer support structure in an improper position, the measured pressure is outside of the target pressure range.

A multi-arm robotic harvesting apparatus is provided. In another aspect, a robotic harvesting apparatus and method automatically optically locate a fruit in a tree, move and align an arm to the fruit, apply a vacuum pressure to temporarily pull the fruit against an end of the arm, rotate the arm to pick the fruit off of the tree, retract the arm and attached fruit, release the vacuum pressure to drop the fruit onto a receiving surface, and simultaneously operate another arm relative to another fruit on the same tree, while avoiding a collision between the arms. A further aspect of a mobile robotic harvesting apparatus and method applies a vacuum pressure to multiple robotically and automatically movable, fruit picking arms from a single vacuum pump, and the apparatus includes a shared optical perception system and programmable controller.

The application discloses a multi-model adaptive low-temperature valve sealing performance testing device and method, and belongs to the technical field of valve detection. The device comprises: a first upper end cover of a low-temperature thermostat, wherein a to-be-tested low-temperature valve is installed on the first upper end cover through a valve support device; the valve support device is in flexible sealing cooperation with a bellows through an adjusting screw, so that the installation height and centering of the to-be-tested low-temperature valve are controlled, and low-temperature valves of different specifications are adapted; the low-temperature thermostat surrounds a first cold screen and a second cold screen; the bottom of the to-be-tested low-temperature valve is connected with one end of a cold-lead bridge through a pipe clamp and is surrounded by the first cold screen; a GM refrigerating machine comprises two-stage cold heads arranged in the low-temperature thermostat; the second cold screen surrounds the two-stage cold heads; the other end of the cold-lead bridge is connected with the two-stage cold heads; three helium supply devices are connected with the inlet and outlet of the to-be-tested low-temperature valve and the low-temperature thermostat respectively; and a vacuum pump unit is connected with the low-temperature thermostat. The application realizes rapid adaptation and accurate testing of low-temperature valves of multiple models.

The invention provides a triple GIS shell metal mold casting mold, and relates to the technical field of casting molds, the triple GIS shell metal mold casting mold comprises a casting bottom mold part, and a sand core assembly is arranged above the casting bottom mold part; the sand core assembly is used for forming a triple GIS shell flange; a wedge block positioning piece is mounted on the casting bottom mold piece; casting mold body parts are arranged on the two sides of the sand core assembly and used for being installed on a casting machine. The exhaust flow dividing piece is adopted and matched with opening of the second electromagnetic valve, suction through an external vacuum pump can be facilitated, exhaust is promoted, and the liquid inlet efficiency is improved; the problem that an existing triple GIS shell casting mold is not convenient to automatically control to actively exhaust and prevent hollowing in the early stage of casting is solved.

The invention discloses a compact accelerator extremely-high vacuum system and an implementation method thereof. The compact accelerator extremely-high vacuum system comprises a dipole iron vacuum chamber, a BUMP iron vacuum chamber, a BPM cavity, a vacuum pump chamber and a quadrupole iron vacuum chamber which are sequentially connected to form a beam main line. A plurality of non-evaporable getter sheets are arranged in the dipole iron vacuum chamber and the quadrupole iron vacuum chamber in an array manner and are used for extracting active gas in a beam main line to obtain extremely high vacuum; a vacuum measuring gauge tube, a sputtering ion pump, a molecular pump and a gate valve are installed on the vacuum pump chamber, the vacuum measuring gauge tube is used for measuring the vacuum degree in the beam main line, the sputtering ion pump is used for extracting argon and methane in the beam main line and conducting baking, and the molecular pump is used for rough extraction of the beam main line and exhaust in the baking process; the gate valve is used for separating the molecular pump from the beam main line. According to the invention, hydrogen, carbon monoxide and other active gases in the system can be extracted under the condition that a titanium sublimation pump cannot be installed due to insufficient space, so that extremely high vacuum can be obtained.

The invention relates to the technical field of sonar buoy detection, in particular to a multi-channel positive and negative pressure airtightness detection system which comprises an equipment cabinet, a high-pressure pump, a vacuum pump, a computer and a detected cabin. The equipment cabinet is provided with two ventilation air paths which are respectively connected with the high-pressure pump and the vacuum pump, the balance tank and the detected cabins are inflated or deflated by controlling valves in the air paths, and a differential pressure sensor is used for detecting the pressure difference value of the balance tank and the detected cabins to judge whether the balance tank and the detected cabins leak air or not. According to the invention, by outputting multiple detection channels, multiple detected cabins can be detected at the same time and independent detection results can be given, so that the detection efficiency is improved; the airtightness detection system is simple in composition structure, does not need additional high-pressure-resistant sealing tanks and tools, adopts the differential pressure type sensor to improve the test precision and accuracy, and is convenient to operate, safe and reliable.

The invention belongs to the field of food drying processing, and particularly relates to a high-quality food drying device and method based on low temperature and negative pressure, a high-temperature heat pump system is used for providing heat in the drying process, supplementing heat taken away by water loss and maintaining the temperature of goods in a proper range. And the water catching system is used for condensing and intensively discharging water vapor generated by drying. And the negative pressure drying system is used for placing dried goods and providing a negative pressure environment to accelerate the drying speed. The pressure in the drying box is reduced to below the saturated vapor pressure corresponding to the moisture contained in the goods through the vacuum pump, heat is generated through the high-temperature heat pump system and conveyed to the flat plate radiation heat exchangers of the negative-pressure drying system to maintain the goods at the set temperature, and finally low-temperature rapid cooling of the goods is achieved. The low pressure is utilized to reduce the gasification temperature of water contained in food, and low-temperature heating is matched to quickly dry the food at low temperature, so that low-loss food nutrition drying is realized.

The invention discloses an oil gas treatment method and system based on pressure triggering and temperature feedback control, a medium and a product, and relates to the field of oil gas treatment. The method comprises the following steps: when a pressure value and an actual temperature of an oil tank meet trigger conditions, guiding oil gas in the oil tank into a condensation unit for condensation, liquefying preset high-boiling-point components in the oil gas into a liquid oil product, and adsorbing the condensed residual oil gas through a double-layer adsorption bed arranged in an adsorption tank in sequence; according to the temperature of the adsorption bed and the tail gas emission concentration, the saturation index is calculated through a composite saturation judgment algorithm, when adsorption is saturated, the vacuum pump is started to conduct vacuum desorption on the adsorption tank, oil gas adsorbed on the double-layer adsorption bed is desorbed, and the desorbed oil gas is circularly sent back to an inlet of the condensation unit to be subjected to secondary condensation liquefaction recovery. By implementing the technical scheme, oil gas can be effectively treated, and the oil gas recovery efficiency is improved.

The utility model provides a spinneret plate full-automatic integrated cleaning device which comprises a machine frame, the longitudinal section of the side of the machine frame is in an L shape, a station table is arranged on the front side of the machine frame, a machine cavity is arranged on the rear side of the machine frame, and the station table is sequentially provided with a feeding station, a cleaning station, a hot air water cutting station, a baking station and a discharging station from feeding to discharging. A transplanting mechanism is arranged on the position table on the front side face of the rack, an electric control cabinet is arranged on one side of the rack, a water supply tank, a water pump, a filter tank, an air blower, a vacuum pump and an infrared heater are sequentially arranged in the machine cavity from the feeding side to the discharging side, the water pump is communicated with the water supply tank through a water pipe, and the filter tank is communicated with the air blower through an air pipe. The feeding station, the cleaning station, the wind cutting station, the drying station, the discharging station and the like are arranged on the cleaning machine, the jig plate is moved through the transplanting mechanism, automation of material flowing among the stations on the whole equipment is achieved, and the automatic feeding and discharging process can be achieved through the arrangement of the skip car and the feeding and discharging mechanism.

The invention belongs to the technical field of general engineering elements, and particularly relates to a valve, in particular to a wastewater evaporator and a using method thereof. The waste water evaporator comprises a separation chamber, a heat exchanger, a vacuum pump and a condensate water tank, and the separation chamber and the heat exchanger are communicated through the vacuum pump; the condensate water tank is arranged on one side of the heat exchanger; a valve body is arranged on the water pipe; a valve element assembly is arranged in the containing cavity in a sliding mode and comprises a guide valve element and a main valve element, and the guide valve element is suitable for sliding relative to the main valve element. The adjusting spring is located between the guide valve element and the main valve element and used for adjusting the axial compression amount of the guide valve element and the main valve element; the sealing spring is arranged between the main valve element and the side wall of the containing cavity and used for providing main sealing force when the valve element assembly is closed; when the valve body is in an open state, the guide valve element moves in the direction of the sealing spring, and the guide valve element is suitable for guiding the sealing spring to be compressed directionally, so that radial deviation and jamming are avoided.

The utility model relates to a hydrogen purification system based on magnesium-based hydride, which comprises a buffer tank, a gas inlet of the buffer tank is connected with a discharge end of a hydrogen purification module through a first gas path header pipe, and a vacuum pump is mounted on the first gas path header pipe in a matched manner. An exhaust port of the buffer tank is connected with a feeding end of the hydrogen purification module through a second gas path header pipe, a metal hydrogen storage material is arranged in the hydrogen purification module, and a feeding port of the buffer tank is connected with an exhaust port of the feed gas storage device through a third gas path header pipe. By arranging the hydrogen purification module, hydrogen components in raw material gas can be absorbed based on magnesium hydride, and compared with some traditional physical and chemical purification schemes, the production cost is low; meanwhile, the number of hydrogen storage tanks in the hydrogen purification module can be reasonably set according to purification requirements, the use flexibility is good, the purity of obtained hydrogen is high, no other impurity gas is mixed in the purification process, and the working efficiency of the system is high.

The invention relates to the field of plastic forming, in particular to a centralized feeding and gas supply collaborative plastic forming system which comprises a hopper, a drying machine, a weighing machine and an extruding machine which are sequentially connected in a sealed mode. The air supply pipeline is respectively connected with the hopper and the stirrer so as to introduce high-pressure hot airflow; the stirrer is connected with the material returning and feeding pipeline and the material conveying pipeline, the material returning and feeding pipeline is connected with the weighing device through the vacuum pump, and the material conveying pipeline is connected with the hopper and used for circulating the plastic raw materials supplied in a centralized mode; and the central controller is used for carrying out material supply and gas supply cooperative control on the extruder through an SAC reinforcement learning model so as to control the drying quality of a plastic molding product and the material returning amount of the material returning and feeding pipeline. According to the invention, material supply and gas supply in the hopper, the drying machine and the weighing machine are cooperatively blended, so that the material supply quality of the extruder is ensured, and the reliable quality of a plastic molded product is ensured.

Provided is a semiconductor fabrication facility including a chamber, a gas supply configured to provide reaction gas to the chamber, a plurality of vacuum pumps respectively configured to pump the reaction gas from the chamber, an exhaust apparatus that is connected to the plurality of vacuum pumps and configured to purify the reaction gas, an exhausting line between the exhaust apparatus and the plurality of vacuum pumps, a thickness detection apparatus connected to the exhausting line and configured to detect a thickness of a byproduct layer in the exhausting line, and a processor connected to the thickness detection apparatus and configured to display preventive maintenance of the exhausting line based on the thickness of the byproduct layer being greater than a threshold value.

The application discloses a shock tube experimental device which can realize switching of a high-pressure ignition experimental system and a single-pulse cracking experimental system; when the shock tube experimental device is used as the high-pressure ignition experimental system, the device comprises a shock tube body which comprises a high-pressure section, an intermediate section and a low-pressure section, and further comprises a two-way section, wherein the two-way section is connected with the intermediate section and the low-pressure section through flanges; a pre-gas distribution system which comprises an oxidant gas cylinder, a diluent gas cylinder and a gas mixing cylinder; a vacuum and pressure supply system which comprises a vacuum pump, a gas extraction pump and a driving gas cylinder, wherein the vacuum pump and the gas extraction pump are used for extracting the shock tube body into a vacuum environment; and the driving gas cylinder is connected with the high-pressure section and the intermediate section through a pipeline; when the shock tube experimental device is used as the single-pulse cracking experimental system, a three-way section and a gas exhaust tank are used to replace the two-way section on the basis of the above structure, wherein the three-way section is connected with the intermediate section, the low-pressure section and the gas exhaust tank through flanges.

This invention relates to a sampling device and method for sulfur hexafluoride (SF6) and its mixed gases used in electrical equipment. The sampling device includes an equipment connection module, a sampling module, a gas filling module, and a vacuuming module. The equipment connection module, used to connect the electrical equipment and the gas sampler, consists of an equipment connection valve, a diaphragm pump, and corresponding pipelines. The sampling module, used for gas buffering, consists of a sampling cylinder, a pressure detection unit, a sampling valve, a gas filling valve, a tail gas valve, and corresponding pipelines. The gas filling module, used to fill the sampling container, consists of a booster pump, a sampling container connection valve, and corresponding pipelines. The vacuuming module, used for vacuuming and tail gas collection, consists of a vacuum pump, a tail gas collection device, and its connection valves. The sampling method utilizes appropriate flushing and vacuuming methods when the gas pressure is higher or lower than 0.2 MPa. This sampling device and method can improve the accuracy of sampling sulfur hexafluoride gas or sulfur hexafluoride mixed insulating gases.

A package movement assembly for an automatic packaging machine comprises a first trolley and a second trolley placed side by side and slidably movable along a packaging direction; a first gripping device and a second gripping device facing each other and between which a package to be moved can be positioned. The first gripping device and the second gripping device are mechanically mounted respectively on the first trolley and on the second trolley, and are movable along a direction substantially parallel to the packaging direction. Furthermore, the first trolley and the second trolley respectively comprise a vacuum pump, associated with the respective gripping device, in fluid connection with said plurality of gripping elements, and an electric motor mechanically connected to the vacuum pump and configured to actuate it.

The invention relates to the technical field of laser cutting machines, in particular to a steel strip sheet laser cutting machine which comprises a base plate, a workbench and a laser transmitter and further comprises a supporting plate, a U-shaped frame, a vacuum pump, a first vacuum assembly, a second vacuum assembly and a blowing assembly. The U-shaped frame is arranged on one side of the workbench, the laser transmitter is arranged above the supporting plate and connected with the U-shaped frame, the vacuum pump is fixedly arranged on the U-shaped frame, and the first vacuum assembly, the second vacuum assembly and the purging assembly are connected through the vacuum pump and all arranged on the U-shaped frame. The input end of the first vacuum assembly and the output end of the laser transmitter are coaxially arranged. Through the arrangement of the vacuum pump, the first vacuum assembly, the second vacuum assembly and the purging assembly, the cutting quality is guaranteed on the basis that melt is prevented from being solidified again on the edge of the bottom of a cutting hole.

The application discloses a heat pipe heat sink welding process based on heat conduction and belongs to the technical field of welding. The welding equipment is composed of a vacuum box, a control box, an electromagnetic device, a heating plate, a control box, a vacuum straight-through pipe with a water cooling jacket, a water pipe, a vacuum variable-diameter cross pipe, a gas release valve, a vacuum valve, a condenser, a vacuum bellows, a vacuum pump, a baffle valve, a gas collecting pipe, a smoke hood, a liquid cooling source and a smoke purifier. The application has the advantages that the problems of product performance decline and even scrapping caused by the floating of the heat pipe in the traditional welding process are perfectly solved, the welding quality is improved, the vacuum pump is protected and the service life of the vacuum pump is prolonged, the process is simple and easy to implement, and the production cost can be greatly reduced.

The invention relates to the technical field of pollutant PFAS sampling, in particular to a stationary pollution source PFAS sampling device. Comprising a particulate matter trap connected with a stationary pollution source through a pipeline, a condensation mechanism, and a vacuum pump located on the particulate matter trap and the condensation mechanism to provide a negative pressure environment. According to the invention, particulate matters in a stationary pollution source are classified and trapped by using the particulate matter trapper, and a filter screen cylinder in the particulate matter trapper can collect particulate matters in different particle size ranges and is also convenient to transfer; meanwhile, the interference of particulate matters in the sucked gas on a subsequent condensation mechanism can be prevented; then the condensation mechanism is used for condensing the gas PFAS in the stationary pollution source, so that the purpose of rapid sampling is achieved; a semiconductor electronic refrigeration structure in the condensation mechanism is used, so that field operation is facilitated; wherein the whole equipment is integrated and put at a required sampling point, so that the installation is convenient, and the sampling efficiency and accuracy are improved.

To provide a vacuum cleaning apparatus capable of improving heat exchange efficiency between gas containing vapor of a cleaning liquid and the cleaning liquid.SOLUTION: A vacuum cleaning apparatus (1) includes a cleaning chamber (10) for cleaning a workpiece (2) with a cleaning liquid supplied from a cleaning liquid tank (20), a condenser (30) for condensing exhaust from the cleaning chamber, a vacuum pump (40) for compressing the exhaust from the condenser, and a rear stage cooling part (50). The vacuum washing apparatus further includes a feed path (R1) for feeding the cooled washing liquid to the latter-stage cooler, and a return path (R2) for feeding the waste liquid from the latter-stage cooler to the washing liquid tank. The rear-stage cooling part has a partition pipe (52) which is provided extending in the horizontal direction in a housing (51) and to which the cleaning liquid is supplied from the supply path, and an introduction pipe (53) which is provided along the partition pipe and introduces the exhaust of the vacuum pump into the partition pipe from a hole part (531) on the outer periphery. The rear-stage cooling unit discharges the cleaning liquid overflowing from the partition pipe into the housing.SELECTED DRAWING: Figure 1

The invention relates to an air tightness detection device and method based on resonance frequency shift of a resonant cavity, belongs to the technical field of air tightness detection, and aims to solve the problems of high equipment cost, complex operation, low efficiency and difficulty in realizing multi-parameter quantitative detection in the traditional air tightness detection technology. High-purity helium with rated pressure is filled into a to-be-detected piece through a gas compressor, the to-be-detected piece is placed in a volume-adjustable detection container after pressure maintaining, and leaked helium is pumped by a vacuum pump to flow into a resonant cavity; resonance frequency deviation caused by helium concentration changes is monitored, temperature and humidity calibration data are combined, three air tightness parameters including the leakage rate (Pa.m / s), the leakage speed (mL / min) and the leakage pressure (Pa) are calculated in real time through a microcontroller, and the air tightness grade of a to-be-detected piece is output according to the air tightness detection standard. According to the device, the volume of the detection container is adaptively adjusted through the sliding rail, and the detection efficiency and adaptability can be remarkably improved by combining frequency mixing excitation and a rapid frequency calibration technology; according to the method, resonance frequency shift-helium concentration-airtightness parameters are converted, and high-precision, multi-parameter and integrated airtightness detection is realized. The invention has the advantages of fast response speed, strong anti-interference performance, low cost and the like, is suitable for fast automatic leak detection of industrial products such as sealing devices, pressure containers and the like, and provides a new scheme for trace gas detection and gas tightness grading.