381 results about "Reflux valve" patented technology

The invention relates to the technical field of air compressors, and discloses a centrifugal air compressor surge suppression method and device.The method comprises the steps that pressure pulsation feature extraction is conducted on a pressure signal of a centrifugal air compressor, and pressure pulsation features are obtained; extracting a flow statistical feature and a frequency band energy feature of the flow signal to obtain a surge early warning feature space; carrying out characteristic decomposition on the bearing vibration signal, and extracting a characteristic frequency to obtain a surge early warning characteristic set; inputting the surge early warning feature set into a three-channel neural network for surge early warning prediction to obtain a surge early warning level; according to the surge early warning grade, control parameters of a guide vane angle controller, an anti-surge valve opening controller and a return valve opening controller are generated, the guide vane angle, the anti-surge valve opening and the return valve opening are synchronously adjusted, and a surge margin value is calculated. According to the method, accurate control over the guide vane angle, the anti-surge valve opening and the return valve opening is achieved, the surge margin value is calculated, and the control accuracy of the guide vane angle, the anti-surge valve opening and the return valve opening is improved. And real-time optimization and adjustment of the control strategy are ensured.

The invention provides a reflux valve supporting remote monitoring of the Internet of Things. The reflux valve comprises a valve body provided with a fluid inlet, a fluid outlet and an internal flow channel, and an electric actuating mechanism is configured for controlling the opening degree of the valve; a microprocessor and a memory are arranged in the control unit, and the control unit processes data of the sensor, calculates a fluid density correction coefficient and a pressure correction coefficient, corrects original flow data collected by the flow sensor and generates an actual flow value; the control unit further identifies the current fluid type and adaptively adjusts the countercurrent detection threshold value of the upstream and downstream pressure difference based on the relationship between the flow and the pressure data; when the pressure difference exceeds the adjusted threshold value, the electric executing mechanism executes emergency turn-off operation; meanwhile, a wireless communication unit is arranged, real-time data transmission is supported, control parameters issued by external monitoring equipment are received, and intelligent control and remote management are achieved; the intelligence and the operation efficiency of the reflux valve can be effectively improved, and the reflux valve is suitable for safety protection and operation optimization under the complex fluid working condition.

The present invention relates to the technical field of solvent purification, and discloses a propylene glycol methyl ether acetate purification control method and a propylene glycol methyl ether acetate purification process, the propylene glycol methyl ether acetate purification control system comprises a rectification device and a rectification control system, the rectification device comprises a rectification tower, a raw material preheater, a condenser, a reflux tank and a reboiler, the rectification control system comprises an environment temperature measuring unit, a tower top temperature measuring unit, a tower bottom temperature measuring unit, a feeding temperature measuring unit and a regulation and control module, the rectification control system is pre-trained with a parameter prediction model, and the parameter prediction model takes the environment temperature, the tower top temperature, the tower bottom temperature and the feeding temperature as input to output regulation and control parameters. The regulation and control parameters comprise the opening degree of a steam valve, the power of a condenser and the opening degree of a return valve, a primary distribution controlled parameter is obtained according to a preset distribution strategy, the primary distribution controlled parameter is specifically the optimized regulation and control parameter, and the tower top temperature is controlled within a preset tower top temperature range according to the primary distribution controlled parameter.

The invention belongs to the technical field of electromagnetic valve shock absorbers, and discloses a novel damping-force-controllable double-electromagnetic-valve shock absorber which comprises a sealing opening and an electromagnetic valve-restoring assembly, the sealing opening is connected to the inner surface of the left end of an oil storage cylinder assembly in a sealed mode, an oil seal is attached to the right end face of the sealing opening, and a guide seat is attached to the right side surface of the oil seal; when current is low, the end cap is located in the middle, the closure area is large, the safety valve is in an open state, the closure area is increased, the pressure difference between the oil cavity P and the oil cavity P generates low-speed damping force, the pressure difference between the oil cavity P and the oil cavity P is increased, the sealing valve plate is easy to open, and the oil cavity P and the backflow valve seat generate high-speed damping force; when current is increased, the end cap is located at the lowermost end and makes contact with the upper end of the backflow valve seat, the closure area is minimum, the pressure difference between the oil cavity P and the oil cavity P generates low-speed damping force, the pressure difference between the oil cavity P and the oil cavity P becomes small, the sealing valve plate is difficult to open, and therefore the oil cavity P and the oil cavity P generate high-speed damping force.

The invention discloses a series compressor system for salt-cavern compressed air energy storage and a start-stop control method, belongs to the technical field of salt-cavern compressed air energy storage, and aims to solve the technical problems that a traditional start mode needs to manually operate a CCS control system, and start failure is easily caused. The system comprises a single-row compressed air system or a plurality of compressed air systems which are connected in parallel; the compressed air system comprises a first-section compressor module, a second-section compressor module, a third-section compressor module, a fourth-section compressor module and a CCS compressor control module which are sequentially connected in series. The series compressor unit can be sequentially started and stopped through one key according to the control logic, safety and reliability are achieved, meanwhile, an anti-surge valve, an electric control valve and a return valve corresponding to the compressor can be automatically adjusted to meet the process change in the starting process, and manual intervention is not needed.

The invention discloses a five-section anti-surge control method for a cracked gas compressor. Comprising two sets of anti-surge systems in a cracking compressor cold and hot reflux control mode, wherein the anti-surge systems are composed of five-return five-hot reflux valves B connected to an outlet of a cracking gas compressor and a cracking gas feeding end and five-return five-cold reflux valves A connected to an outlet of a reflux tank of a high-pressure depropanizing tower and the cracking gas feeding end; the two compressor anti-surge control systems carry out coordinated control on backflow of the five-return five-hot-backflow valve B and backflow of the five-return five-cold-backflow valve A. Anti-surge control over the five-return five-cold-backflow valve A is added. The cold reflux control compressor anti-surge control system is provided with flow low limit control of a five-section outlet C2 hydrogenation unit and 30% opening limit of a hot anti-surge valve. The anti-surge line of the five-return five-cold-backflow A valve is consistent with that of the five-return five-hot-backflow B valve, and the anti-surge line is 1.2 times that of the five-return five-hot-backflow B valve. According to the invention, the technical problem of more stable control of the five-section anti-surge valve can be solved.

A manifold for collecting a tissue sample with a medical waste collection assembly. A base portion of a housing is removably engaged with a manifold receiver to provide a suction path from an inlet fitting receiving a suction line. A tray may be removably positioned within an accessory sleeve. Locating features facilitate defining a gap between a base portion of the tray and a lower barrier of the accessory sleeve. The tray may include a control surface to move the manifold between a sealing configuration, and a bleed configuration in which a second suction path is provided through the gap and below the tray. A backflow prevention valve may be disposed within the suction path between the tray and a filter element. Methods for collecting the tissue sample are also disclosed.

The invention relates to the technical field of fluid control equipment, and discloses an anti-backflow valve which comprises a valve body, a valve rod, a sealing valve seat and a valve plate, an output pipe is arranged on the outer wall of the right side of the valve body, an input pipe is arranged at the bottom of the valve body, the sealing valve seat is fixedly installed in the input pipe, and the valve plate is pressed on the sealing valve seat. The valve rod is rotated to drive the connecting disc to rise, the spring drags the valve plate to rise, the valve plate is separated from the sealing valve seat, the inserting rod is arranged, on one hand, the valve plate is guided, on the other hand, when the valve needs to be closed, the valve rod can drive the inserting rod to move downwards, and then the valve plate is tightly pressed on the sealing valve seat; if the water pressure in the input pipe is lower than the water pressure in the valve cavity of the valve body, the pressure acting on the upper surface of the valve plate can downwards press the valve plate at the moment, then the valve plate is pressed on the sealing valve seat, the valve is closed, and then the backflow problem is avoided.

Coupler device 100 for fluidly connecting a beverage chamber of a beverage container to a beverage dispensing line. The coupler device comprises a beverage conduit 80 extending between an inlet which is configured for being connected to a first dispensing line part attached to the beverage container and an outlet 82 which is configured for being connected a second dispensing line part attached to a dispenser. The beverage conduit 80 includes a horizontally extending beverage conduit section 83 that defines a horizontal flow path for the beverage, wherein, at the beverage conduit section, the coupler device comprises a reflux valve arranged for preventing a reflux flow of beverage through the beverage conduit from the outlet to the inlet of the coupler device. The reflux valve includes a movable valve element 84 which is movable relative to the beverage conduit section along the horizontal flow path for enabling a beverage pressure surge in the dispensing line to travel across the valve.

The invention discloses a VOC (volatile organic compound) recovery and treatment device in a color-coated sheet production process, which comprises a sealing cover and a controller, the sealing cover is connected with a transition pipe through an induced draft fan, the transition pipe is connected with a cold liquid pipe through a condenser, the cold liquid pipe is connected with a liquid discharge pipe, the liquid discharge pipe is connected with a liquid collection tank through a liquid collection valve, and the liquid collection tank is connected with a liquid level sensor and the liquid discharge valve. The cold liquid pipe is connected with a gas distributing pipe, the gas distributing pipe is connected with an absorption and desorption tank through a gas inlet valve, a grid support is connected in the absorption and desorption tank, the grid support is connected with an adsorbent, the absorption and desorption tank is connected with a heater and a blower, the absorption and desorption tank is connected with a catalytic combustion chamber through an output valve, and the absorption and desorption tank is connected with a transition pipe through a return valve. The method has the beneficial effects that efficient recovery is achieved, and resource utilization is maximized; deep purification is achieved, and the environment-friendly effect is remarkable; energy is saved, consumption is reduced, and cost is greatly reduced; intelligent control is achieved, and operation is stable and reliable; the structure is optimized, and maintenance is convenient and efficient.

The invention relates to the technical field of injection molds, and discloses a semiconductor packaging injection mold which comprises a fixed mold, a movable mold, a supporting table, a double-shaft telescopic air cylinder, an injection molding cavity, a multi-point controllable ejector pin mechanism, a hydraulic demolding mechanism and the like. According to the mold, balanced closing and separation of the movable mold are achieved through the double-shaft telescopic air cylinder, the injection molding cavity is matched with the surface of a semiconductor packaging product, and the accuracy of the sealing cavity is ensured. The multi-point controllable ejector pin mechanism is composed of ejector pins, reset springs and magnetic pushing assemblies, the ejector pins are distributed in a matrix mode, and damage to packaged products is reduced. And the hydraulic demolding mechanism realizes uniform injection of a demolding agent through a conveying hole, a liquid guide pipe and an anti-reflux valve, so that the stability and no damage in the demolding process are ensured. According to the mold, automatic control is combined, synchronous forming of the double injection molding cavities is achieved, the productivity is effectively improved, silicone oil emulsion is adopted as a release agent, a lubricating film is formed, and the production efficiency and the product quality are improved.

The invention relates to the technical field of compressors, in particular to a series-connection automobile towing compressor system and an automatic surge control method. The series-connection automobile towing compressor system comprises a plurality of stages of automobile towing compressors, a plurality of temperature reduction devices, a bypass return valve, a plurality of temperature reduction adjusting valves and a plurality of orifice plate flowmeters. The problems that in the prior art, cost is high, energy consumption is large and the control effect is not ideal are effectively solved, the multiple stages of automobile dragging compressors are arranged in series and matched with the temperature reducing device and the bypass backflow valve, effective circulation and temperature control of media are achieved, cost of independently using a surge backflow valve in the prior art is reduced, and meanwhile the control effect is good. Through the arrangement of the vortex shedding flowmeter, the pressure sensor, the temperature sensor and the rotating speed sensor, the inlet flow, pressure, temperature and rotating speed of each stage of compressor are accurately measured, in combination with theoretical surge pressure ratio calculation, the surge risk is pre-judged in advance and automatically controlled, and energy consumption increase caused by premature intervention of a bypass return valve at the low rotating speed is avoided.

To provide a dirt removal device capable of reducing the size of a sewage inlet while preventing the backflow of gas from the sewage inlet.SOLUTION: A disclosed dirt removal device includes: a sewage inlet with an opening in the top; a lid to cover the opening of the sewage inlet; a tubular inlet tube attached to the lid and is connectable to the sewage inlet via a suction hose in the discharge outlet of the sewage storage tank of a railway vehicle; and a check valve attached to the inlet tube. The check valve includes: a shaft body; an opening / closing lid rotatable on a shaft body, which is rotatable between a first rotation position closing the lower end of an inlet tube and a second rotation position opening the bottom end of the inlet tube; and a balance weight that is attached to the opening / closing lid and configured so as to, when the force applied from inside the inlet tube to the opening / closing lid is less than a first threshold, position the opening / closing lid in the first rotation position, and when the force applied from inside the inlet tube to the opening / closing lid is greater than or equal to a second threshold, which is greater than the first threshold, position the opening / closing lid to the second rotation position.SELECTED DRAWING: Figure 2

The utility model discloses a water dispenser system with backflow pressure relief function, which comprises a filter unit, a booster pump, a reverse osmosis membrane group and a drinking device which are communicated in sequence, a three-way backflow valve is arranged on a water path where the booster pump is communicated with the filter unit, and a water flow switch valve is arranged at the water production end of the reverse osmosis membrane group. The water inlet end of the water flow switch valve is provided with a return pipe communicated with the three-way return valve, and the water outlet end of the water flow switch valve is intersected with the water inlet end of the drinking water equipment; water at the water production end is conveyed to the three-way return valve through the return pipe, so that the water production end of the reverse osmosis membrane group is decompressed to avoid frequent starting of the water flow switch valve, and then the water is conveyed to the reverse osmosis membrane group through the booster pump. When the water consumption of the water using end is small, repeated power-on and power-off of the water flow switch valve can be avoided, potential safety hazards of a water dispenser system are reduced, meanwhile, pressure relief can be achieved at the water producing end, and normal use and the filtering effect of the reverse osmosis membrane group function are ensured.

The utility model relates to the field of sludge dewatering, and discloses a sludge feeding device for sludge dewatering equipment and a sludge dewatering system. The sludge feeding device comprises a vertical pump body and a backflow device, the vertical pump body is arranged at the top of the sludge tank, the feeding end is connected with a liquid feeding pipeline, and the discharging end is connected with a liquid discharging pipeline; the reflux device comprises a reflux pipeline and a reflux valve, the first end of the reflux pipeline is communicated with the liquid outlet pipeline, and the second end is communicated with the sludge tank. The sludge dewatering system comprises a sludge tank, sludge dewatering equipment and a sludge feeding device. According to the sludge feeding device provided by the utility model, the vertical pump body conveys sludge from bottom to top in a pipeline form, additional sludge can flow back into the sludge tank to meet the conveying requirement of the sludge, the vertical pump body can be directly arranged at the top of the sludge tank, a pump room does not need to be arranged, the investment cost is reduced, and the vertical pump body can be exposed or covered by a simple shell; during overhaul and maintenance, workers can directly operate, the maintenance process is relatively simple, and the working efficiency is improved.

The invention provides a hydraulic brake system which comprises an oil can, a brake master cylinder, a pedal simulator, an electric supercharging device, a wheel brake unit, a brake pedal, a control unit and a backflow oil way, the two ends of the backflow oil way are connected with the oil can and a hydraulic cavity of the brake master cylinder respectively, and a backflow valve is arranged on the backflow oil way; the control unit is connected with the return valve and used for controlling opening and closing of the return valve according to the braking efficiency of the vehicle braking device during braking. When the backflow valve is opened, brake fluid in the hydraulic cavity of the brake master cylinder can flow back to the oil can through the backflow oil way. The hydraulic brake system can increase the stroke of the brake pedal when the brake efficiency of the vehicle brake device is attenuated, so that a driver can sense the attenuation of the brake efficiency. The invention further provides a vehicle.

The invention relates to the field of motorcycle braking systems, and discloses a motor-free motorcycle ABS system and a control method, the motor-free motorcycle ABS system comprises a negative pressure generation unit, a hand brake unit and a return valve; the system further comprises a pressure increasing valve, a pressure reducing valve, an energy accumulator and a braking unit. The hand brake unit is connected with the negative pressure generation unit, the hand brake unit comprises a main cylinder, the main cylinder provides high-pressure brake fluid for an ABS system, the main cylinder is connected with two oil ways, one oil way is communicated with an energy accumulator, the other oil way is communicated with the brake unit through a pressure increasing valve, and the other end of the negative pressure generation unit is connected with a return valve; the reflux valve is connected with the reducing valve; the pressure reducing valve and the pressure increasing valve are connected in parallel and then connected with the brake unit; the energy accumulator is connected between the hand brake unit and the pressure increasing valve through the one-way valve, and the energy accumulator is connected with the return valve and the pressure reducing valve. The brake system has the advantages of low cost, reliability in use and the like.

The invention discloses a low-temperature upper-stage power system, and relates to the field of spaceflight. Comprising a gas cylinder, a pressure supplementing electromagnetic valve, a pressure supplementing pore plate, a self-generation pressurizing electromagnetic valve, a self-generation pressurizing pore plate, a storage tank, an overflow valve, a storage tank pressure sensor, a pressure stabilizing valve, a circulating pump, a circulating control valve, a pump front valve, a Joule-Thomson throttling expansion valve, a heat exchanger and a branch supply control valve; the main engine subsystem comprises a pump, a turbine, an auxiliary valve, a fuel gas generator, a main valve, a precooling backflow valve, a main thrust chamber, an evaporator, a starting gas cylinder, a starting gas cylinder control valve, a main thrust chamber igniter and a fuel gas generator igniter. The attitude control engine subsystem comprises a plurality of attitude control engines; each attitude control engine comprises an attitude control thrust chamber, and an oxidant control valve, a fuel control valve and an attitude control thrust chamber igniter are arranged on each attitude control thrust chamber. Propellant supply of the main engine and the attitude control engine is achieved through the unified pressurization conveying system.

A vertical pipeline shield pump comprises a vertically-installed pump body, the pump body is connected to a vertical pipeline in series through a suction cover and an outlet cover, a motor stator, a motor rotor and a pump impeller are arranged in the pump body, the motor stator isolates a stator winding and a conveying medium through a stator shielding sleeve, and the motor rotor and the pump impeller are coaxially connected through a pump shaft. The pump is provided with a main circulation loop and an auxiliary circulation loop, a medium in the main circulation loop enters through a suction cover, enters a motor outer shell to absorb heat after being pressurized by a pump impeller and guided by a guide vane in sequence, and then is conveyed to a rear pipeline through an outlet cover; in the auxiliary circulation loop, a pump impeller outlet diversion medium enters a pump rear rotor cavity through a front bearing body circulation hole, circulates along the inner wall of a stator shielding sleeve after being pressurized by an auxiliary impeller and is converged into main circulation. The motor outer shell is of a three-layer structure, the middle layer and the outermost layer are connected through a rib plate, a pump shaft penetrates through a rear bearing body and other components to achieve stable supporting, meanwhile, a power sealing assembly and a safety backflow valve are arranged, and efficient, stable and leakage-free operation of the pump is guaranteed.

The invention belongs to the technical field of medical instruments, and particularly relates to a reflux valve stent. A reflux valve support comprises a plurality of retaining parts and a plurality of positioning parts, one retaining part corresponds to one positioning part, the outflow end of each positioning part is fixedly connected with the outflow end of the corresponding retaining part, and the inflow end of each retaining part is provided with an anchoring part; a plurality of barbs are arranged in the circumferential direction of the anchoring part, and the free ends of the barbs are opposite to the inflow end of the positioning piece. According to the design that the inflow end of the positioning piece corresponds to the barbs, the inflow end of the positioning piece and the barbs clamp the aortic valve ring at two opposite positions in the axial direction, a two-way fixing structure is achieved, and the purpose that the aortic valve ring is well clamped through the positioning piece and the barbs is effectively achieved.

The invention belongs to the technical field of ships, and provides a large bulk cargo ship high-pressure CO2 storage system based on seawater cold insulation, which comprises a high-pressure storage tank, a storage tank cavity, a temperature sensor, a control unit, a supercharging device, a pressure sensor, a cooling device, an electromagnetic valve, a safety valve, a seawater valve, a seawater pump, an inlet valve, a release valve, a return valve, a drain valve and a void chamber. CO2 is pressurized, seawater is utilized for sufficient heat exchange, the pressure of the high-pressure storage tank is at the lowest pressure corresponding to the temperature of the seawater, power consumption of the pressurizing device is greatly reduced, and compared with a low-temperature CO2 liquefaction mode which needs large low-temperature refrigeration power consumption, the high-pressure storage tank does not need to consume power for refrigeration and heat preservation, the power consumption is lower. And meanwhile, liquefied CO2 is stored in the high-pressure storage tank, and seawater is utilized to fully exchange heat with the liquid CO2 in the high-pressure storage tank, so that the CO2 in the high-pressure storage tank is always kept in a liquid state, and the condition that the weight of the CO2 loaded in a single high-pressure storage tank is reduced due to the fact that the CO2 is in a gaseous state is avoided.

The present invention concerns an explosive material charging device (1) and a method of positioning the explosive material charging device (1) in a borehole (3). The explosive material charging device (1) comprises a top anchor unit (5) and a bottom anchor unit (7) each configured to engage the borehole wall (8), an expandable tube member (11) arranged between the top anchor unit (5) and the bottom anchor unit (7) and configured to be charged with explosive material (40), the bottom anchor unit (7) comprises a backflow prevention valve device (13) configured to prevent the explosive material (40) to flow out from the expandable tube member (11), wherein the backflow prevention valve device (13) is openable for permitting a charging hose (15) to enter the expandable tube member (11) for reaching the interior of the top anchor unit (5),

The invention relates to the technical field of chemical production automatic control, in particular to a hexachlorodisilane automatic production control system and method. Data are corrected through the temperature compensation model, side reaction caused by inaccurate temperature is avoided, the temperature and pressure of the reaction kettle are adjusted through negative feedback of the self-adaptive temperature and pressure control model, a gain function is dynamically adjusted according to the reaction time, and the control precision is improved; on the basis of online component analysis, a mathematical regression analysis model is established, coefficients are determined through machine learning, and a production parameter optimization module is used for calculating the opening degree of a return valve and optimizing parameters of a rectifying tower so as to reduce by-products and guarantee the quality of hexachlorodisilane; according to a data analysis result, automatic safety inspection is automatically carried out, the explosion risk is quantitatively evaluated, leakage is detected and speculated through a leakage positioning algorithm, graded protection signals are matched, safety measures are executed, and production safety is guaranteed.

The invention discloses an anti-surge system device of a centrifugal compressor and a control method, and particularly relates to the technical field of anti-surge. A first pressure transmitter; a first temperature transmitter; a second pressure transmitter; a second temperature transmitter; a branch pipeline; an anti-surge return valve; an anti-surge reflux cooler; a temperature control valve; a third temperature transmitter; the invention provides an anti-surge control system. According to the invention, an anti-surge backflow method of throttling first and then cooling is adopted, and temperature control is set at the outlet of the cooler, so that the problems of cooling first, pressure reduction second and carrying of a large amount of liquid after pressure reduction in the anti-surge backflow process are effectively solved, the guarantee of stable work is provided, and the economic benefit is further improved.

The invention discloses a temperature control structure and device, the temperature control structure comprises a plurality of valve structures, and the temperature control structure further comprises a base body, a base body input pipeline, a temperature control input pipeline, a temperature control output pipeline and a base body output pipeline; the base body comprises a plurality of valve holes formed in the base body, the valve holes comprise a supply valve hole and a return valve hole, a supply valve channel is formed in the bottom end face of the supply valve hole, a return valve channel is formed in the bottom end face of the return valve hole, and corresponding valve structures are installed on the supply valve hole and the return valve hole in a sealed mode; the valve seats of the two valve structures are respectively arranged corresponding to the supply valve channel and the return valve channel; one end of the base body input pipeline is communicated with the supply valve channel; one end of the temperature control input pipeline is communicated with the supply valve hole; one end of the temperature control output pipeline is communicated with the return valve channel; and one end of the base body output pipeline is communicated with the return valve hole. According to the invention, the use of connecting pipelines and sealing elements is saved, and the problem of micro leakage of the temperature control medium is also solved.

The utility model discloses a desulfurization wastewater treatment system, which comprises a plurality of effector units, a reflux valve and a live steam valve, the effector units are connected in sequence; the live steam inlet of the first effector unit is provided with a live steam valve; the desulfurization wastewater outlet of the last effector unit is provided with a reflux valve, and the desulfurization wastewater outlet of the last effector unit is connected with the desulfurization wastewater inlet of the first effector unit through the reflux valve; the live steam valve is configured to act according to the live steam valve control instruction.

The utility model relates to the technical field of lifting check valves, in particular to a buffering lifting check valve which comprises a valve body, a valve cover is fixed at the top end of the valve body, a support is fixed at the bottom end of the valve cover, a valve clack and a check ring are arranged in the valve body, a valve rod is fixed at the top end of the valve clack, and connecting rods are fixed on two sides of the valve rod. Vertical rods are fixed to the top ends of the two connecting rods, the two vertical rods are sleeved with buffer springs, check blocks are fixed to the two sides of the support, limiting blocks are arranged on the two sides of the valve rod, air springs are fixed to the top ends of the two limiting blocks, a flow slowing plate is arranged on the side, away from the valve clack, of a check ring, and a plurality of conical flow slowing holes are formed in the flow slowing plate. The two buffer springs buffer the speed of the valve rod and the valve clack, the two connecting rods extrude the two air springs in the medium backflow and valve clack reset process, the conical flow slowing hole in the flow slowing plate can reduce the pressure brought by medium backflow, and then the speed of the valve rod and the valve clack is buffered.

The present invention discloses an intelligent hysteroscopic liquid management system and a fluctuation suppression method thereof, and relates to the technical field of liquid management of medical equipment. The intelligent hysteroscopic liquid management system and the fluctuation suppression method thereof collect the liquid pressure and flow data inside the uterine cavity and the infusion pipeline by setting a liquid fluctuation detection module, a dynamic fluctuation compensation control module, and a fluctuation suppression module, and extract the liquid fluctuation characteristics and establish a dynamic characteristic model by combining frequency domain and time domain analysis technology. Based on the fluctuation characteristic model, the liquid fluctuation index is calculated in real time, and the flow rate and the opening of the reflux valve of the infusion pump are dynamically adjusted through an adaptive control algorithm, so as to achieve effective compensation and suppression of liquid fluctuations. At the same time, through a flexible shock-absorbing component, high-frequency fluctuations in the liquid transmission process are absorbed at the physical level, and the fluctuation suppression effect is further optimized. The liquid management accuracy in hysteroscopic surgery can be significantly improved, the interference of surgical operations caused by liquid fluctuations can be reduced, and the stability of the surgery can be ensured.

A compressor unit includes a first spillback valve, an adjusting means that adjusts a processing amount of hydrogen gas by a succeeding compression stage, an upstream side temperature sensor, and a controller. The controller refers to suction temperature acquired by the upstream side temperature sensor, and can execute a first control and a second control, the first control being of controlling the first spillback valve so that suction temperature falls within a predetermined temperature range, and the second control being of controlling the adjusting means so that a processing amount of the succeeding compression stage is adjusted according to a change amount in pressure in an intermediate flow path caused by the first control. The predetermined temperature range is set to a range higher than reference temperature based on liquefaction temperature of air and less than 0°C.

The utility model belongs to the technical field of coating machines, and discloses a coating device. The coating device comprises a coating die head, a slurry pipe, a coating valve and a return valve which are communicated in sequence, slurry can flow out of an outlet of the coating die head through the return valve, the coating valve, the slurry pipe and the coating die head in sequence, the return valve can enable part of the slurry to flow back to the return valve, and the coating device further comprises a back suction valve mechanism. The back-suction valve mechanism comprises a back-suction pipe and a back-suction valve assembly, the back-suction pipe is communicated with the slurry pipe, the back-suction valve assembly comprises a back-suction driving part and a sealing assembly, the back-suction pipe is filled with the sealing assembly in a sealed mode, and the back-suction driving part can drive the sealing assembly to reciprocate along the back-suction pipe. According to the coating device, the slurry absorption effect is obvious, and then the situation that slurry overflows from the coating die head during the coating interval is avoided.