103 results about "Reflux valve" patented technology

The utility model discloses a steam condensate water buffer water storage system in the technical field of condensate water storage, which comprises a collecting tank and a buffer tank which are closed storage tanks, the collecting tank and the buffer tank are communicated through a buffer valve, a return valve is additionally arranged to reversely communicate the collecting tank and the buffer tank, and a liquid level meter is arranged to monitor the water level. According to the pipe network system, condensate water can be automatically adjusted and buffered, extreme fluctuation of the liquid level of the condensate water collecting tank can be avoided, when the liquid level of the condensate water collecting tank is low, water is supplemented in time, and when the liquid level in the condensate water collecting tank is high, redundant water in the condensate water collecting tank is temporarily stored through the buffering tank; and enough space is provided for the collecting tank, upstream condensate water can be conveniently collected, the situation that the upstream condensate water is detained is avoided, abnormal production conditions are effectively avoided, and the stability of the water amount in the collecting tank can be further improved.

The invention relates to methods and devices for blow molding containers. A preform is thermally conditioned and then transformed into the container within a blow mold by the application of blowing pressure. The blowing gas is introduced into the preform in at least two pressure stages via compressed air lines assigned to each pressure stage. A blowing air valve controlling the injection is arranged in each of the compressed air lines. At least the blowing gas of the highest pressure stage is supplied from an external compressed gas source. After container forming, at least a portion of the used blowing air is released to ambient pressure via a relief line controlled by a relief valve.For the purpose of reuse, at least a further portion of the used compressed air is routed via a return line controlled by a return valve to a first compressed gas reservoir, and the stored compressed gas is used for a subsequent forming process. A directional control valve is arranged in the return line between the return valve and the first compressed gas reservoir. This valve has at least two outlets and at least one inlet and connects the return line on its outlet side to the first compressed gas reservoir or to another, second compressed gas reservoir that stores compressed gas at a pressure different from that of the first compressed gas reservoir.

The application discloses a single-drive multi-effect linkage type rural domestic sewage treatment device and method, and belongs to the field of rural sewage treatment. The device comprises a device cavity, a mixing chamber, a filtrate chamber, a multi-directional cooperation stirring mechanism and a linkage stirring mechanism, a differential pressure driven one-way backflow valve is arranged between the mixing chamber and the filtrate chamber, a recirculation pump, a pumping pipeline and a distribution nozzle are arranged in the mixing chamber, and a filter dish with a fabric filter is arranged below. The single-drive motor is used for driving the filter dish to reciprocating rotate and the stirring paddle of the filtrate chamber to reciprocating stir through bevel gears, chain wheels and gear strips. After the sewage is pretreated in a septic tank, the sewage enters the mixing chamber, is filtered by the fabric filter through intermittent spraying at a small flow rate, and is automatically and fully backflowed and recycled for purification at a low flow rate period, and is discharged after reaching the standard. The device has the advantages of simple structure, low energy consumption, convenient maintenance, adaptation to the characteristics of large fluctuation of rural sewage, high treatment efficiency, stable operation, and suitability for popularization and use in rural areas.

The utility model discloses an automatic T-shaped product anti-reflux valve performance test frame, which comprises a test frame, a cylinder frame is fixedly arranged at the center position of the top of the test frame, a pressing cylinder is fixedly arranged on one side of the cylinder frame, a rear cylinder fixedly arranged at the top of the test frame is arranged on the rear side of the cylinder frame, and a pressing cylinder is fixedly arranged on the other side of the cylinder frame. Side cylinders fixedly mounted at the top of the test frame are arranged on two sides of the cylinder frame; a lower pressing plate is fixedly installed at the output end of the lower pressing air cylinder, a rear baffle is fixedly installed at the output end of the rear air cylinder, side baffles are fixedly installed at the output ends of the side air cylinders, and products to be tested are arranged among the lower pressing plate, the rear baffle and the two side baffles. According to the utility model, the product to be tested can be conveniently limited and fixed, the channel of the T-shaped product to be tested can be conveniently positioned and sealed, the test accuracy is improved, the automation degree is high, the operation is simple, the situation that the performance of the damaged anti-reflux valve cannot be found in manual assembly is avoided, and the unqualified product is prevented from reaching the hand of a terminal user.

The present invention relates to an enteral gravity-feeding system, where the venting mechanism is integrated into the anti-reflux valve.

Method for a supercharged power engine, comprising the following: Differentiate between a deterioration of a compressor return valve (CRV) throttle and a CRV position sensor based on both a throttle inlet pressure and the commanded position of the CRV throttle.

The utility model provides a kind of based on the realization of wine circulation irradiation ripening device of pumping, including wine storage tank, further include: with the wine pump of wine storage tank is connected by pipeline, and the irradiation tank of another end of wine pump is connected by pipeline;Wherein, wine pump is used to pump the wine in wine storage tank to the irradiation tank in ripening area;Irradiation device, irradiation device is used to generate X-ray, and the X-ray generated using irradiation device irradiates ripening area;Irradiation tank is provided with sample inlet, reflux port and wine outlet, and reflux port and wine outlet are respectively connected to wine storage tank by pipeline, and reflux valve is set in the pipeline side close to wine storage tank, and wine outlet and wine storage tank are connected pipeline side close to irradiation tank on the one side of setting wine valve;Wherein, sample inlet is used to make wine enter to irradiation tank, reflux port is used to make wine flow back to wine storage tank, and keep reflux valve for opening state during irradiation, and after irradiation, make the remaining wine in irradiation tank flow back to wine storage tank by opening wine valve through wine outlet.

In an aircraft, a fuel return valve (FRV) controls a flow of fuel, used to cool an oil feeding a propulsion engine and an oil of an integrated drive generator (IDG). A first sensor supplies measurements of the oil temperature at an output port of the IDG and a second sensor supplies measurements of oil temperature of the propulsion engine. An FRV operation monitoring system: determines, for each flight of the aircraft, an oil temperature maximum at an output port of the IDG and / or a maximum oil temperature of the propulsion engine; assesses a trend of one and / or the other of the oil temperature maxima over several flights; and generates an alarm when the trend of one and / or the other of the oil temperature maxima shows that a predetermined threshold has been exceeded.

The utility model discloses a back-flushing type vacuum liquid filling device which comprises an oil storage tank, a valve frame is arranged on one side of the oil storage tank, a backflow valve and a booster pump are installed on the top of the oil storage tank, an air inlet pipe is connected to the top of the oil storage tank in a penetrating mode, and an oil cavity is formed in the top of the valve frame. The bottom of the oil cavity is connected with a plurality of one-way switch valves in a penetrating mode, the bottoms of the one-way switch valves are connected with liquid filling pipes in a penetrating mode, the bottoms of the liquid filling pipes are provided with connectors in a screwed mode through threads, one ends of the connectors are connected with equipment to be filled with liquid in a penetrating mode, and sliding grooves are correspondingly formed in the side wall of the valve frame. A sliding groove is formed in the valve frame, a sliding seat is slidably connected outside the sliding groove in a sleeved mode, racks are correspondingly arranged on the inner walls of the two sides of the valve frame, gears are correspondingly installed on the inner walls of the two ends of the sliding seat in a rotating mode, the racks are meshed with the gears, a collecting groove is formed in the bottom of the valve frame, and the collecting groove and the backflow valve are of a matched structure.

The utility model relates to the technical field of rectification and purification, and discloses a reflux device for rectification and purification of methyl isobutyl ketone, which comprises a support frame, a rectification tower is fixedly connected to the middle of the top wall of the support frame, a reflux pump is fixedly connected to the top of the outer wall of the rectification tower, and the other end of the reflux pump is communicated with a condenser. The condenser is fixedly connected to the rear side of the outer wall of the rectifying tower, the flow control system is fixedly connected to the bottom of the outer wall of the connecting pipe, and a closing mechanism is arranged in the middle of the inner wall of the supporting frame and used for preventing a backflow valve. According to the methyl isobutyl ketone rectifying and purifying device, methyl isobutyl ketone mixed liquid is heated in the rectifying tower, low-boiling-point components are vaporized and rise, high-boiling-point impurities are left at the bottom of the tower and pumped to the condenser through the reflux pump, liquid enters the reflux tank through the conveying pipe, condensate is stored in the reflux tank, and stable operation and cooperative work of the device are ensured through the supporting frame so as to rectify and purify methyl isobutyl ketone.

The application discloses a low-temperature liquid rocket engine immersion precooling system and method, and belongs to the technical field of liquid rocket engine precooling, which comprises a low-temperature propellant tank, a conveying pipeline, a low-temperature pump, a post-pump pipeline and low-temperature valves; the application only utilizes necessary heat exchange components of the engine to realize immersion precooling, and does not need to set a discharge valve, a discharge pipeline, a reflux pipeline and a reflux valve, so that the system structure is greatly simplified; the precooling process does not need propellant discharge, effectively reduces the propellant consumption, and improves the rocket carrying capacity; in combination with an overall layout of an inclined downward direction, a guide inner wall and an inclined upward design of the post-pump pipeline, a continuous exhaust passage is constructed, gas is ensured to smoothly float up, and the precooling efficiency is greatly improved; by limiting the relative relationship between the inclination degrees of the guide inner wall and the post-pump pipeline, the gas floating rate can be flexibly optimized according to different working conditions, the best balance between the exhaust efficiency and the flow stability is realized, and the system working condition adaptability and the precooling effect controllability are remarkably improved.

A system for bleeding air from a compressor of an aircraft engine, the system comprises a bleed off valve and a plenum for receiving bleed air from the compressor via the bleed off valve. The plenum has a first outlet for discharging the bleed air from the plenum into the atmosphere, and a second outlet fluidly connected to the compressor for reinjecting a portion of the bleed air into an air intake portion of the compressor. A backflow valve is provided for selectively closing the first outlet of the plenum. The backflow valve has an actuator operable to displace a closure from a closed position to an open position upon a fluid pressure inside the plenum reaching a pressure threshold.

The utility model discloses an alkali-washed tail gas absorption device which comprises a tail gas pipeline, a tail gas valve is arranged on the top of the tail gas pipeline close to the edge of one end, one end of the tail gas pipeline is connected with a condenser, and the center line of the bottom of the condenser is communicated with a backflow pipeline. A sight glass is embedded in the center of the front surface of the backflow pipeline, a backflow valve is arranged at the position, close to the bottom of the sight glass, of the outer surface of one side of the backflow pipeline, the bottom end of the backflow pipeline is connected with a recycling tank, and the position, close to the top edge, of the outer surface of one side of the backflow pipeline communicates with a gas conveying pipe; and one end of the gas conveying pipe is connected with a filter box. According to the utility model, the gas generated after alkali washing flows through the condenser, so that material residues in the gas can be better liquefied to generate liquid, and the liquid flows back to the inside of the recovery tank through the return pipe, thereby greatly reducing the volatilization of bromoalkane, improving the efficiency and improving the environment.

The invention relates to the technical field of water treatment, and provides a waterway control method, a water treatment system, water treatment equipment and a storage medium, the method comprises the following steps: a control device detects whether a preset flushing trigger condition is met; and if yes, executing a head cup water washing process. The process at least comprises a first flushing sub-process and a second flushing sub-process which are executed in sequence. According to the first sub-process, a first water inlet valve set, a first backflow valve set, a second backflow valve set and a waste water valve set are controlled to be opened, meanwhile, other related valve sets are closed, a pressurizing assembly is started, and backflow flushing and stored water replacement of areas such as a front filtering assembly are achieved. In the second sub-process, a second water inlet valve group, a circulating valve group and a waste water valve group are controlled to be opened, other related valve groups are simultaneously closed, and a pressurizing assembly is started, so that a circulating water path is formed to carry out forward flushing on the RO filtering assembly. Different valve groups are cooperatively controlled by stages, so that multi-region targeted efficient flushing of the water treatment system is realized, and the initial water quality is effectively improved.

The novel quick-release gear intermittent valve comprises a coating valve body and a backflow valve body, the coating valve body and the backflow valve body each comprise a valve body, a valve rod, a valve element, a driving assembly and a transmission assembly, an axial valve cavity is formed in each valve body, and the valve cavity of each coating valve body communicates with the valve cavity of the corresponding backflow valve body; the transmission assembly comprises a gear box body, a gear shaft, a gear arranged on the gear shaft and two transmission bearings, the valve body is installed at the top end of the gear box body, the gear shaft is located in the gear box body, and one end of the gear shaft extends out of one side of the gear box body and is connected with the driving assembly through a coupler; the two transmission bearings are arranged on the periphery of the gear shaft in a sleeving mode, the gear is located between the two transmission bearings, the valve rod penetrates through the gear box body, a rack is arranged on the valve rod, the rack is meshed with the gear, and one end of the valve rod extends into the valve cavity and is provided with a valve element. According to the coating device, the coating quality can be guaranteed, and the gear can be quickly disassembled.

The invention provides a glue solution transfer pump station which comprises a rack, a glue inlet filtering assembly and a glue supply pump module, and the glue inlet filtering assembly is provided with a filtering glue inlet and a filtering glue outlet; the glue supply pump module comprises a branch seat, a booster pump assembly and a pneumatic return valve assembly, and the branch seat is connected to one side of the glue inlet filtering assembly; a glue inlet connecting channel, a glue outlet channel and a pressure-stabilizing backflow channel are arranged in the branch seat, the glue inlet connecting channel is communicated between the filtering glue outlet and the booster pump assembly, one end of the glue outlet channel is communicated with the booster pump assembly, the other end of the glue outlet channel forms a glue supply outlet in the side wall of the branch seat, one end of the pressure-stabilizing backflow channel is communicated with the glue outlet channel, and the other end of the pressure-stabilizing backflow channel is communicated with the pressure-stabilizing backflow channel. The other end of the pressure-stabilizing backflow channel is communicated with the glue inlet connecting channel, and the pneumatic backflow valve assembly is inserted into the pressure-stabilizing backflow channel; when the pressure of the glue solution in the glue outlet channel is too large, the pneumatic backflow valve assembly opens the pressure stabilizing backflow channel, so that the glue solution in the glue outlet channel flows back to the glue inlet connecting channel through the pressure stabilizing backflow channel.

A three-valve manifold including a first valve body, a second valve body, a third valve body, and a central chamber. The first valve body, second valve body, and third valve body are adapted to provide selective fluid communication between a canister of either refrigerant gas additive or refrigerant gas, a vacuum pump, and the low-pressure port of a chilling system. Methods for using the three-valve manifold are also disclosed. The three-valve manifold is a metallic, vacuum-rated, three-valve direct-charge device with integrated Schrader access, anti-backflow can tap, continuous bonding, and minimal internal volume—designed to safely support exact-charge servicing of flammable refrigerants in indoor and sensitive environments.

A vehicle, comprising a vehicle thermal management system (100). The vehicle thermal management system comprises: a compressor (101), a heat exchange flow path (130), and a return flow path (102). The heat exchange flow path is provided with at least one heat exchanger (140), and the heat exchange flow path is configured to return at least part of a heat exchange working medium, flowing out of the compressor, to a working medium input port of the compressor after the heat exchange working medium performs heat exchange by means of the at least one heat exchanger. The return flow path is provided with a return valve (102a), and when the return valve is opened, at least part of the heat exchange working medium flowing out of the compressor is returned to the working medium input port of the compressor through the return valve.

The utility model provides a kind of PSA analytical gas recovery system, PSA system hydrogen gas outlet is connected with hydrogen tube, the analytical gas outlet of PSA system is connected with the air inlet of analytical gas compressor, analytical gas compressor gas outlet is connected with the backflow gas import of cryogenic separation system and the air inlet of decarburization system;Pressure gauge is installed at the backflow gas import of cryogenic separation system, cryogenic backflow valve is installed on the pipeline between analytical gas compressor and cryogenic separation system, decarburization backflow valve is installed on decarburization backflow pipe. The pressure of analytical gas returned to cryogenic separation system is detected by pressure gauge, ensure that analytical gas is narrowed in the backflow gas import of cryogenic separation system, and is sent back to decarburization system by decarburization backflow valve, to ensure that analytical gas can be sent back to system to recover, reduce the waste of raw material gas;And raw material gas is used to heat analytical gas, avoid CO2 in analytical gas pipeline inner wall frost quickly, ensure that analytical gas pipeline is narrowed more slowly due to frost, improve the time of system normal operation.

The utility model provides a closed fuel oil discharge and reinjection system for a fuel oil tank, which comprises the fuel oil tank, a fuel oil pump, a fuel oil pump inlet pipeline, a fuel oil pump outlet pipeline, an oil return pipeline, a return valve, a fuel oil tank oil filling pipeline and an oil discharge pipeline, the fuel oil pump is connected with the return valve through a fuel oil pump outlet pipeline, the return valve is connected with the fuel oil tank through the oil return pipeline, the fuel oil tank oil filling pipeline is connected with the fuel oil tank, one end of the oil discharge pipeline is connected with the fuel oil pump outlet pipeline, and the other end of the oil discharge pipeline is connected with the fuel oil tank. And the other end of the oil discharge pipeline is connected with the fuel oil tank oil filling pipeline.

The present application provides a kind of pressure relief backflow valve, including valve body and end cover, pressure relief pipe, valve body includes cavity and valve core, cavity includes first cavity section, second cavity section and third cavity section, cavity also includes air inlet and feed inlet, sliding seat is arranged in first cavity section, isolation component is arranged in third cavity section, pressure relief pipe includes connecting hole and pressure relief hole, valve core includes one head end, head end can be movably closed or opened connecting hole, a spring is used to exert tension to sliding seat, valve body also includes a recess part, isolation component includes a center valve seat, center valve seat includes a through hole corresponding with recess part, at least a part of valve core can be presented through the through hole, one aspect gas source is the acting force of valve core movement, so that the pressure fluctuation response of the pressure relief backflow valve of the present application to gas source will be more direct and fast, two aspects users can easily observe or detect the action of valve core, to improve the efficiency of overhaul, the present application simultaneously provides the spraying system of application this pressure relief backflow valve.

The application relates to the technical field of water treatment, and provides a water path control method, a water treatment system, a water treatment device and a storage medium, the method comprising the following steps: a control device detects whether a preset flushing trigger condition is met; if yes, a first-cup water flushing process is executed. The process at least comprises a first flushing sub-process and a second flushing sub-process executed in sequence. The first sub-process realizes backflow flushing and water replacement of a front filter assembly and other regions by controlling a first water inlet valve group, a first backflow valve group, a second backflow valve group and a wastewater valve group to be opened, while other related valve groups are closed and a pressure boosting assembly is started. The second sub-process forms a circulating water path to positively flush an RO filter assembly by controlling a second water inlet valve group, a circulating valve group and a wastewater valve group to be opened, while other related valve groups are closed and the pressure boosting assembly is started. The application realizes targeted and efficient flushing of multiple regions of the water treatment system by stage-by-stage and cooperative control of different valve groups, and effectively improves initial water quality.

A filter (16) for a fluid system (14) includes a filter housing (18) and a filter media (36) located within the filter housing. A filter cover member (44) is coupled to the filter housing and includes a fluid distribution wall (54) having a plurality of fluid openings (56) therein. The filter also includes a seal (82) having an annular central body (84) and a valve skirt (86) that contacts an outflow wall surface (60) of the filter cover member at a backflow prevention sealing location (100). The valve skirt is deformable away from the outflow wall surface to allow fluid to flow through the fluid distribution wall and alternately seal the fluid distribution wall against backflow.

The utility model discloses a melt conveying optimizing device of an automobile lampshade injection molding machine. The melt conveying optimizing device comprises a melt heating area, a melt conveying pipeline, a double-screw conveying system, a pressure adjusting device, a melt backflow system and an automatic cleaning system. The melt temperature is accurately adjusted in the melt heating area through an electric heater and a temperature sensor, and the heating uniformity is ensured. The double-screw conveying system adopts a reverse or synchronous rotation mode, and a built-in cooling channel can effectively reduce the temperature of the screws and reduce abrasion. The melt backflow system enables excess melt to flow back to the heating area through a backflow pipeline, the backflow rate of the melt is adjusted through a backflow valve, and it is guaranteed that the flow of the melt is stable. The automatic cleaning system removes residues in the melt pipeline through a cleaning pump and a spray head, and equipment is kept clean. The device is made of a high-temperature-resistant material such as nickel-based alloy or molybdenum alloy, so that the durability and the stability of the device are improved.

The utility model provides an exhaust type germination machine. The exhaust type germination machine comprises a main body and a cover body, the main body is provided with a top opening, the cover body covers the top opening to define a germination space, and the exhaust type germination machine comprises a water mist generator for generating water mist in the germination space and an airflow generator for driving the water mist to flow. The cover body is provided with an exhaust channel communicated with the germination space, the exhaust channel comprises an air inlet, an air outlet and a drop capturing cavity communicated between the air inlet and the air outlet, and the drop capturing cavity extends in a zigzag mode to capture liquid drops in water mist airflow in the flowing process of the water mist airflow; the drop catching cavity is communicated with the germination space through a backflow hole, and a one-way sealed backflow valve is assembled at the backflow hole. According to the exhaust type germination machine provided by the invention, the penetrating effect of water mist airflow can be improved, liquid drops can be recycled, and gas can be exhausted.

The invention belongs to the technical field of medical instruments, and particularly provides gastroenterology enema equipment which is composed of a U-shaped fixing frame, an electric push rod, an anal tube, a shutoff valve, an anti-reflux valve, a support, a solution cylinder and a control panel. The device controls the movable push rod of the electric push rod to extend out through the shifting rod and the speed adjusting rod of the control panel to drive the anal tube to be inserted into the body of a patient; when the electric push rod extends out, the rolling wheel of the shutoff valve is pulled through the connecting plate, compression on the solution pipe is relieved, and solution conduction is achieved; and when the electric push rod retracts, the spring pulls the roller to reset, and the solution pipe is pressed for closure. And meanwhile, one-way flowing of liquid is achieved through double valves of the anti-reflux valve, and the heating assembly in the bearing plate is controlled through the temperature adjusting rod to conduct constant-temperature preheating on the solution cylinder. The device integrates automatic intubation, intelligent cut-off, backflow prevention and constant temperature control, and effectively solves the problems that existing enema equipment is tedious in operation, solution is prone to leakage and waste, and temperature control is inconvenient.

The compressor unit comprises a first backflow part for returning hydrogen gas discharged from a previous-stage compression section to a suction flow path, an adjusting unit for adjusting the hydrogen gas treatment amount of a subsequent compression section, a pressure sensor, an upstream-side pressure sensor and a control part. The control unit is capable of executing: a first control for controlling the adjustment means so as to adjust the processing amount of the subsequent compression stage on the basis of the pressure acquired by the upstream-side pressure sensor; and a second control for controlling the first return valve such that the intermediate pressure acquired by the pressure sensor falls within a predetermined pressure range.

The utility model relates to the technical field of gap coating valve, disclose a kind of pressure reducing valve cover for gap coating valve, including inner cover, fixed ring is fixedly connected in the inner cover inner wall, outer cover is fixedly connected in the inner cover outer wall, the outer wall of outer cover is equipped with a plurality of through slot, the bottom fixed connection of inner cover is fixedly connected with conical block, the bottom fixed connection of conical block is fixedly connected with extension cylinder, the diameter of inner cover is 25mm, the outer diameter of fixed ring is 10mm, the inner diameter of fixed ring is 8.5mm, the outer wall of through slot is equipped with 4 along the outer wall 90 degrees circular array of outer cover, the diameter of outer cover is 42mm, the length width height of through slot is 8.5mm, 3.0mm and 2mm respectively, the inner wall of conical block and extension cylinder is equipped with the groove with the same length as the inner diameter of fixed ring.

The invention provides a high-speed clearance coating valve which comprises a first feed port, a second feed port, a first return valve, a second return valve, a return port, a first coating valve, a second coating valve and a discharge port, and the input end of the first feed port and the input end of the second feed port are connected with a feeding mechanism. The output end of the first feeding port is connected with the input end of the first backflow valve, the output end of the first backflow valve is connected with the backflow port and the input end of the first coating valve, the output end of the second feeding port is connected with the input end of the second backflow valve, and the output end of the second backflow valve is connected with the backflow port and the input end of the second coating valve. The output end of the first coating valve and the output end of the second coating valve are respectively connected with a discharge port, and the discharge port is connected with a coating die head. According to the scheme, the two feeding pipelines are designed to conduct coating operation alternately, the alternate operation mode is beneficial to improving the coating efficiency and speed, and meanwhile buffering time is provided for pipeline switching.

The invention provides liquid raw material sampling equipment which comprises a base, a shell and a sampling mechanism, the shell is arranged on the base, the sampling mechanism is contained in the shell and comprises a reversing valve, a cleaning pipe, a driving assembly, a sampling backflow assembly and a plurality of connecting pipes, and the driving assembly comprises a driving part and a driving control valve. The sampling backflow assembly comprises a sampling valve, a sampling pipe, a detection piece and a backflow valve. According to the invention, the totally-enclosed shell design is adopted, and the sampling mechanism is completely accommodated in the shell, so that the sampling process is physically isolated from an operator, the risks of chemical splashing, inhalation or skin contact existing in a traditional simple sampler are fundamentally eliminated, and the personnel safety and occupational health are guaranteed. Moreover, the independent bearing and fixing assembly is arranged in the shell as a mounting framework of the sampling mechanism, so that direct maintenance can be realized without destructively disassembling the shell during maintenance, and the process is greatly simplified.