29results about How to "Improve vacuum efficiency" patented technology

The utility model discloses a two-shaft mixing pump. The two-shaft mixing pump is characterized by comprising a pump body and two connecting shafts, a roots pump body cavity and a screw pump body cavity which are mutually independent are arranged in the pump body; the pump body is provided with an air inlet, an air outlet and a connecting channel, the roots pump body cavity is communicated with the outside atmosphere through the air inlet, the screw pump body cavity is communicated with the outside atmosphere through the air outlet, and the roots pump body cavity is communicated with the screw pump body cavity through the connecting channel. Two roots rotor parts which are meshed with each other are arranged in a cavity of the roots pump body, and the two roots rotor parts are respectively arranged on the two connecting shafts; and two screw rotor parts which are meshed with each other are arranged in a cavity of the screw pump body, and the two screw rotor parts are respectively mounted on the two connecting shafts. According to the utility model, the occupied space is reduced, the vacuum degree is improved, and the cost is reduced.

The invention discloses a multi-stage roots vacuum pump which comprises a main machine body, a vacuum pump, a vacuum pump and a vacuum pump, and a rotor is arranged in the main machine body; the scavenging plate is arranged on one side of the main machine body; the motor is arranged on the scavenging plate and is in transmission connection with the rotor; the gear box is arranged on the other side of the main machine body and is in transmission connection with the rotor; wherein an air inlet pipe and an air outlet pipe are arranged at the upper end of the main machine body, and the air inlet pipe is communicated with the air channel in the main machine body. According to the invention, through the design of the six-stage flow channel, the air exhaust speed is higher through six-stage compression, the vacuumizing efficiency is improved, meanwhile, the size of the whole machine can be reduced, and green operation is realized.

The invention relates to the technical field of sealed storage equipment, and discloses a manual vacuumizing sealed tank which comprises a tank body, a cover body and a connecting piece, the cover body is in sealed connection with the tank body through the connecting piece, the connecting piece is provided with a vacuum piece, a pressure relief piece, an indicating piece and a limiting piece, the vacuum piece is used for vacuumizing the interior of the tank body, and the pressure relief piece is used for relieving pressure in the tank body. The structure that the cover body driven by rotation is matched with the control ring and the vacuum piece is adopted, traditional pressing type vacuum pumping design is replaced, the piston block can be driven to reciprocate through gear transmission by rotating the cover body, the air pumping stroke is stable, operation is labor-saving, the vacuum pumping efficiency is greatly improved, hand fatigue caused by repeated pressing is avoided, and the vacuum pumping efficiency is improved. Meanwhile, the limiting piece and the one-way ratchet ring are matched to achieve one-way rotation of the cover body, and the multiple sealing design of the one-way piece, the piston silica gel ring and the sealing gasket is matched, so that gas backflow is effectively prevented, the stable and reliable vacuum state in the tank is ensured, oxidative deterioration of stored objects can be better inhibited, and the shelf life is prolonged.

The utility model relates to the technical field of power plants, and discloses a power plant vacuum system condensation water secondary recovery system which comprises a vacuum pump and a steam-water separator communicated with the vacuum pump through a first pipeline, the steam-water separator is communicated with a condensation water tank through an overflow pipe, and the condensation water tank is communicated with a steam exhaust device through a second pipeline. Compared with the prior art, the device has the advantages that secondary condensation water of a vacuum system is recycled, and the efficiency of a vacuum pump is improved.

The invention discloses a plate conveying device for a workpiece hanging plate transfer cabin of a large vacuum coating machine, the plate conveying device is arranged in a transfer cabin and comprises two plate conveying mechanisms which are oppositely arranged up and down, each plate conveying mechanism comprises a power source, a screw rod, a connecting seat, a sliding seat, a jacking mechanism and a sliding rail, the connecting seat is connected with a screw rod nut on the screw rod, and the sliding seat is connected with the jacking mechanism. The power source drives the lead screw to rotate to drive the connecting base to slide along the sliding rail, the sliding base is fixedly connected with the connecting base, the two jacking mechanisms are arranged on the sliding base, each jacking mechanism comprises a supporting block capable of ascending and descending, and a clamping groove matched with the thickness of a workpiece hanging plate is formed in each supporting block. The space of the transition cabin can be reduced, then the vacuumizing time of the cabin is shortened, and the working efficiency is improved.

The invention relates to a refrigerating device and medical equipment, the refrigerating device comprises a container body, an interlayer assembly and an on-off mechanism, and the container body is provided with an interlayer space and an extraction opening communicated with the interlayer space; the interlayer assembly is arranged in the interlayer space and divides the interlayer space into a first cavity and a second cavity, and at least one through ventilation opening is formed in the interlayer assembly so that the first cavity can be communicated with the second cavity; the number of the on-off mechanisms corresponds to that of the air vents, the on-off mechanisms are arranged at the air vents, and the on-off mechanisms are configured to be capable of moving relative to the interlayer assembly so as to open or close the air vents. By means of the structural form, the efficiency of vacuumizing the interlayer space can be guaranteed, the heat preservation performance of the interlayer assembly can also be guaranteed, and therefore the production efficiency is improved.

The utility model discloses a kind of molecular pump and diffusion pump vacuum pumping system for coating machine, including control valve device and pump device, control valve device includes valve body assembly and valve core assembly, valve body assembly includes vacuum valve cavity, vacuum valve cavity includes valve core assembly includes valve core piece and driving mechanism, one end of valve core piece and the cavity wall between vacuum valve cavity form first chamber, the other end and the cavity wall between vacuum valve cavity form second chamber, main vacuum port is communicated with first chamber, sub vacuum port is communicated with second chamber;In the initial stage of vacuumizing, the vacuum coating chamber is rapidly vacuumized by second chamber, energy-saving effect is played, vacuumizing time is shortened, production efficiency is improved, and the utility model can realize the control of multiple pump bodies by driving mechanism driving valve core piece, reduce the number of power source, reduce the cost of manufacture, and valve core piece is placed horizontally, reduce the height of the connecting position of connecting load vacuum chamber.

The utility model relates to a molten salt feeding bin and molten salt electrolytic refining equipment. The fused salt feeding bin comprises a bin body, a vacuumizing assembly and a reverse blowing assembly, the vacuumizing assembly comprises a vacuumizing pipeline, a vacuum pump and a filter element, one end of the vacuumizing pipeline is communicated with the bin body, the other end of the vacuumizing pipeline is communicated with the vacuum pump, and the filter element is fixedly arranged in the vacuumizing pipeline; the back-blowing assembly is communicated with the vacuumizing pipeline, and the communication position is located between the filter element and the vacuum pump and used for back-blowing gas towards the filter element along the vacuumizing pipeline. By arranging the reverse blowing assembly communicated with the vacuumizing pipeline, when the fused salt powder blocks the filter element and affects the vacuumizing efficiency, the vacuum pump is closed, the reverse blowing assembly is opened, the filter element and the vacuumizing pipeline can be dredged through gas reverse blowing, the fused salt powder is blown back into the stock bin, and the vacuumizing efficiency is improved. And after dredging is completed, the blowback assembly is closed, the vacuum pump is started again, and high vacuumizing efficiency can be guaranteed by repeating the process.

The utility model discloses industrial automatic edge grinding equipment, which relates to the technical field of edge grinding equipment, and comprises a working table, a placing table is arranged at the top of the working table, a first cylinder is mounted at the top of the working table, a first hydraulic rod is mounted at the top of the first cylinder, and a chute seat is arranged at the top end of the first hydraulic rod; sliding grooves are formed in the two sides of the sliding groove base. Through the arrangement of the workbench, the collecting box, the collecting pipe, the motor, the fan and the dust suction hood, dust generated in the edge grinding process can be sucked into the collecting box through rotation of the fan, so that dust collection is achieved, a large amount of powder is prevented from being sucked into the body of a worker, the body health of the worker is guaranteed, and the working efficiency is improved. And the dust cleaning difficulty of workers is greatly reduced, the cleanliness of a working site is guaranteed, the collection area of the collection pipe can be increased by arranging the dust collection cover, and the dust collection work efficiency is improved.

The invention relates to the technical field of mechanical engineering, and discloses an anti-cavitation test system and method for a thrust bearing under high temperature, heavy load and high rotating speed, and the system comprises a heavy load simulation part, a high temperature simulation part and a high speed dynamic simulation part which are arranged in sequence. The high-temperature simulation part comprises a high-temperature box, a closed test cabin is arranged in the high-temperature box, and the test cabin is communicated with the vacuumizing subsystem through an air pipe and is communicated with the oil injection subsystem through an oil pipe; one side of the high-temperature box is slidably and hermetically connected with a thrust shaft, the other side of the high-temperature box is rotatably and hermetically connected with a power shaft, and the thrust shaft and the power shaft are coaxially arranged; one end of the thrust shaft extends into the test cabin and is fixedly connected with a first clamp for mounting a test sample piece, and the other end of the thrust shaft is connected with the heavy load simulation part; one end of the power shaft extends into the test cabin and is fixedly connected with a second clamp for mounting a thrust ring, and the other end is in transmission connection with the high-speed dynamic simulation part. The cavitation problem in the testing process is solved through vacuum pumping-high temperature oil cooperative control, and accurate testing conditions are provided for bearing performance judgment and product development.

The utility model provides a kind of Roots vacuum pump and screw vacuum pump series system, including Roots vacuum pump, screw vacuum pump, condenser, first motor, second motor, water storage tank, electric cabinet, first electric control switch valve, second electric control switch valve, third electric control switch valve, electric control three-way valve, liquid level transmitter, pressure transmitter, first check valve and relevant pipeline;First motor is connected with Roots vacuum pump shaft, and second motor is connected with screw vacuum pump shaft;Liquid level transmitter is arranged at the side of water storage tank;Electric cabinet is respectively connected with first motor, second motor, first electric control switch valve, second electric control switch valve, third electric control switch valve, electric control three-way valve, liquid level transmitter, pressure transmitter communication connection.By using Roots vacuum pump and screw vacuum pump in series, the utility model not only can improve the vacuum degree of system and the stability of work and the efficiency of system vacuum extraction, but also can ensure normal work of work object while reducing system energy consumption.

The utility model discloses a screw vacuum pump which comprises a pump body and two connecting shafts, a screw pump body cavity is arranged in the pump body, two screw rotor components meshed with each other are arranged in the screw pump body cavity, and each screw rotor component is installed on one connecting shaft. A pump body cavity is formed in each pump shell, and the two pump body cavities form the screw pump body cavity; a convex ring is arranged on the end face of one pump shell, a concave cavity matched with the convex ring is formed in the end face of the other pump shell, and the convex ring is inserted into the concave cavity; an air inlet and an air outlet which are communicated with the screw pump body cavity are respectively formed in the outer wall of the pump body; a silencer is further installed on the portion, on the air outlet side, of the outer wall of the pump body, a connecting air inlet and an air outlet are formed in the silencer, and the connecting air inlet is communicated with the air outlet. According to the utility model, the assembling and debugging convenience is improved, and the noise is reduced.

The utility model discloses a leakage detection device for a secondary battery. The secondary battery leak detection device comprises a plurality of pressure containers, vacuumizing equipment, a leak detector and a leak marking piece, the plurality of pressure containers are connected in parallel, each pressure container is provided with a cavity, and the cavity is configured to contain a secondary battery; the vacuumizing equipment is communicated with the plurality of cavities; the leak detector is communicated with the plurality of cavities; and the leakage marking piece is communicated with the cavity. According to the secondary battery leak detection device, the leak rate detection of the secondary battery can be more accurate, and the situation that the secondary battery with the qualified leak rate is misjudged to be unqualified due to inaccurate detection of the leak rate value of the secondary battery is effectively prevented.

The utility model discloses a freeze-drying device for producing a composite carbon source, which comprises a drying box, a sealing box door is arranged on the surface of the drying box, a bearing plate is arranged in the drying box, a refrigerating coil and an electric heating coil which are matched with each other are arranged in the bearing plate in a winding manner, and the end part of the refrigerating coil is connected with a refrigerating unit. Cold air pipes and hot air pipes are evenly arranged on the two sides and the back of the inner wall of the drying box at intervals, an air cooler is connected with the cold air pipes, an air heater is connected with the hot air pipes, a plurality of air blowing openings are formed in the cold air pipes and the hot air pipes, vacuumizing pipes are arranged on the drying box and matched with the bearing plates, and vacuumizing pumps are connected to the vacuumizing pipes. According to the drying box, the refrigerating and heating uniformity in the drying box can be improved, the freezing and heating sublimation efficiency of a composite carbon source in the drying box is improved, and the drying effect is improved.

The invention discloses a polycarboxylic acid water reducing agent monomer production device and a use method thereof, and belongs to the technical field of chemical production, the polycarboxylic acid water reducing agent monomer production device comprises a reaction tank, a feed port arranged at the left part of the reaction tank, a discharge port arranged at the bottom of the reaction tank, a valve arranged on the discharge port, a driving mechanism arranged at the upper part of the reaction tank, and a linkage mechanism arranged on the driving mechanism, an air extractor is arranged on one side of the reaction tank, communicated with the reaction tank and connected with the linkage structure, a pressing mechanism is arranged in the reaction tank, a puncturing mechanism is arranged on the lower side of the pressing mechanism and fixed to the inner wall of the reaction tank, and a stirring mechanism is arranged in the reaction tank; according to the device, bubble puncturing and mechanical vacuumizing can be synchronously realized while stirring polymerization reaction is performed on a polycarboxylic acid water reducing agent monomer, so that a large amount of power is saved, and meanwhile, the vacuumizing efficiency is higher and more thorough.

The invention discloses a beam extraction structure of a multimodal field negative hydrogen ion source, and relates to the field of multimodal field negative hydrogen ion sources. The beam extraction structure of the multimodal field negative hydrogen ion source comprises a shielding outer shell and a magnetic guiding mechanism installed in the shielding outer shell, a beam pipeline is installed in the middle of the magnetic guiding mechanism, and heat conduction epoxy resin is poured among the shielding outer shell, the magnetic guiding mechanism and the beam pipeline. According to the beam extraction structure of the multimodal field negative hydrogen ion source, the size of a vacuum bin required by use is reduced by optimizing the inner diameter size of a beam pipeline and the structural design of a beam cover plate, meanwhile, a magnetic guiding mechanism and the beam pipeline are poured into a shielding outer shell through heat conduction epoxy resin, and a spiral cooling copper pipe is arranged in the shielding outer shell, so that the beam extraction efficiency is improved. Therefore, the assembly process is simplified, the overall heat dissipation efficiency is improved, and meanwhile the vacuumizing efficiency and mode are optimized.

The utility model discloses a table top adjuster, which belongs to the technical field of building tools and comprises an adjuster body, and two rubber suckers are connected below the adjuster body. The device further comprises a vacuum pump, the vacuum pump is communicated with the two rubber suction cups through air pipes, and the two rubber suction cups can be vacuumized at the same time through the vacuum pump. According to the table top adjuster, the two suction cups are vacuumized at the same time through the externally-connected vacuum pump, the vacuumizing efficiency is improved, and meanwhile the suction force of the suction cups is also improved.

The utility model relates to a manual vacuum pump for a suction cup. The manual vacuum pump comprises a sleeve, a one-way valve, a piston rod and a guide rod, one end of the sleeve is an air inlet channel communicated with an inner cavity of the sleeve, the other end of the sleeve is an opening of the inner cavity of the sleeve, the piston rod penetrates into the inner cavity of the sleeve from the opening of the inner cavity of the sleeve, and the one-way valve is arranged at the joint of the air inlet channel and the inner cavity of the sleeve. One end of the guide rod is a pressing plate which abuts against the one-way valve, the outer wall of the guide rod is sleeved with a reset spring, one end of the reset spring abuts against the pressing plate, and the other end of the reset spring penetrates into an inner hole of the piston rod and abuts against the inner end face of the inner hole of the piston rod. According to the manual vacuum pump, the longitudinal size of the whole manual vacuum pump is reduced, meanwhile, the inner cavity of the sleeve serves as a vacuumizing cavity, the longitudinal size of the inner cavity of the sleeve is increased, miniaturization design is better facilitated, and the size of the whole suction cup is reduced.

This invention relates to the field of vacuum unit technology, and more particularly to a Roots screw vacuum unit. It includes a base frame, on which a screw pump, a motor, and a transmission box are mounted. A Roots pump housing is fixedly connected to the base frame and communicates with the screw pump. The transmission box has two output shafts, each fixedly connected to a rotating shaft. An impeller is fixedly connected to the rotating shaft, and symmetrically distributed scrapers are slidably connected to the impellers. A first elastic element is fixedly connected between each scraper and an adjacent impeller. Symmetrically distributed weights are slidably connected to both sides of each impeller. This invention uses scrapers to remove impurities adhering to the inner wall of the Roots pump housing, reducing the amount of impurities adhering to the inner wall, ensuring the stability of the gap between the impeller and the inner wall of the Roots pump housing, thereby reducing the probability of impeller wear, extending the disassembly and maintenance cycle of the device, and ensuring its normal operation.

The present invention discloses a boiler feed water deoxygenation system and method. The system includes a deaerator and a desalted water tank. The upper part of the deaerator is a deaerator tower, the lower part of the deaerator is a deaerator water tank and a deaerator water jet tank, the deaerator tower and the deaerator water tank are connected, the top of the deaerator tower is provided with an exhaust port I, the top of the deaerator water jet tank is provided with a deaerator water jet inlet, the bottom of the deaerator water jet tank is provided with a deaerator water jet outlet, the middle of the deaerator water jet tank is provided with an overflow port, and the top of the deaerator water jet tank is provided with a water ejector, the exhaust port I is connected to the air inlet of the water ejector; the desalted water tank is provided with a desalted water inlet and a desalted water outlet, the desalted water inlet is connected to the overflow port on the deaerator water jet tank through a pipeline, and the desalted water outlet is connected to the deaerator water jet inlet through a pipeline. The present invention eliminates the chemical assisted deoxygenation system, adds a circulating water tank of the desalted water tank, avoids the corrosion of the equipment by the chemical assisted deoxygenation additive, and is conducive to the maintenance of the equipment.

The utility model relates to the technical field of thin film deposition, and discloses a heating disc structure and a thin film deposition device. The heating disc structure comprises a first heating disc and an exhaust pipe, a first exhaust channel is formed in the first heating disc, an exhaust hole communicated with the first exhaust channel is formed in the upper surface of the first heating disc, the upper surface of the first heating disc is suitable for placing a wafer, the wafer covers the exhaust hole, one end of the exhaust pipe is communicated with the first exhaust channel, and the other end of the exhaust pipe is communicated with the second exhaust channel. The other end of the air suction pipe is suitable for being connected with the driving piece. According to the utility model, the upper surface of the first heating disc is provided with the air exhaust hole which is communicated with the first air exhaust channel in the first heating disc, and when the driving member starts to exhaust air from the air exhaust pipe, air in the first air exhaust channel and the air exhaust hole is exhausted, so that a negative pressure area is formed on the contact surface of the air exhaust hole and the wafer, and the lower surface of the wafer can be effectively adsorbed; and tightly adsorbing the wafer on the upper surface of the first heating disc.

The utility model discloses a thermoforming mould structure, which relates to the technical field of thermoforming processing, and comprises a mould, a bottom plate, a support piece and a vacuum interface assembly, the mould is arranged on the bottom plate, the bottom plate is provided with a through hole communicated with an inner cavity of the mould, and the support piece is arranged at the bottom of the bottom plate; the vacuum interface assembly is arranged at the bottom of the bottom plate, and a top opening of the vacuum interface assembly is matched with the through hole; when the mold is used, the mold is arranged on the bottom plate, the bottom plate is supported on equipment through the supporting piece, the through hole in the bottom plate is communicated with the inner cavity of the mold, and vacuum equipment is communicated with the inner cavity of the mold through the vacuum connector assembly. And the required vacuum pumping space is small, the vacuum pumping efficiency is higher, and the power requirement of the required vacuum equipment is lower.

The invention provides a vacuum clamping mechanism which comprises a base, a vacuum chuck and a flexible sleeve, the base is provided with a first air guide hole, and the first air guide hole is connected with a vacuum pump; the vacuum chuck is provided with a second air guide hole, the second air guide hole communicates with the first air guide hole, and the first end face of the vacuum chuck is used for clamping a plate-shaped part; the first end of the flexible sleeve is hermetically connected with the outer wall surface of the base, and the second end of the flexible sleeve is hermetically connected with the outer wall surface of the vacuum chuck; the vacuum clamping mechanism is configured as follows: before vacuumizing, the base is flexibly connected with the vacuum chuck through the flexible sleeve; after the wafer is clamped and vacuumized, the base is attached to the second end face of the vacuum chuck in a vacuum adsorption mode. According to the vacuum clamping mechanism provided by the invention, after vacuum is established, the vacuum clamping mechanism is changed into a rigid structure from a flexible structure, so that the position of the clamped part can be ensured not to deviate and swing in the handover or moving process of the clamped part, good position precision is kept, and the predictability of the position of the clamped part is improved.

The vacuum-pumping assembly comprises an exhaust pipe connected to a vacuum-pumping opening of the vacuum-pumping tower, the exhaust pipe comprises a flow dividing assembly, the flow dividing assembly comprises a first exhaust pipe and a second exhaust pipe which are connected in parallel, and the two ends of the first exhaust pipe and the two ends of the second exhaust pipe are converged through a three-way pipe and connected with the vacuum-pumping opening and a vacuum pump respectively. A condensing device is arranged on the first exhaust pipe, an electromagnetic reversing valve is arranged between the first exhaust pipe and the second exhaust pipe, a hygristor is arranged in the exhaust pipe close to the vacuumizing opening, the electromagnetic reversing valve is electrically connected with the hygristor, and when the resistance of the hygristor is reduced when encountering water vapor, the electromagnetic reversing valve is switched to the vacuumizing opening to be communicated with the first exhaust pipe; when the hygristor does not meet water vapor, the resistance value is increased, and the electromagnetic reversing valve is switched to the vacuumizing opening to be communicated with the second exhaust pipe. According to the vacuum pumping assembly of the vacuum tower, air in the vacuum tower can be rapidly pumped out at the beginning of vacuum pumping, the vacuum pumping efficiency is effectively improved, and the energy consumption is reduced.

The utility model relates to vacuum sealing machine technical field especially simple type plastic packaging bag vacuum sealing device, its technical scheme: including shell, the shell bottom is fixed with bottom shell, the vacuum pump is installed in the bottom shell, the shell upper end front side is equipped with the sealing cavity, the sealing cavity bottom rear side is equipped with the air extraction hole, the sealing cavity bottom and located the air extraction hole peripheral fixed sealing pad, the sealing cavity bottom front side is fixed with the electric heating wire, the sealing cavity is hinged with the flap, is provided with same sealing pad in the sealing cavity in the flap. The utility model sets up the transverse plate that stretches out in the annular sealing pad of air extraction, when air extraction, utilizes the transverse plate and inserts into the packaging bag, can quickly extract the gas in the packaging bag through the flow guide hole, effectively avoids the packaging bag opening to be extruded by the sealing pad, leads to the problem that the gas is difficult to discharge outward, improves the vacuumizing efficiency.

This utility model provides a vacuum tire vulcanizing machine, belonging to the technical field of tire vulcanizing equipment. It includes a tire mold, an upper crossbeam, a support plate, a lower base, a booster cylinder, a vacuum tube, and a vacuum pump. The upper crossbeam is positioned above the lower base, and the upper crossbeam and lower base define a receiving cavity. The booster cylinder is mounted on the lower base, and its drive rod extends into the receiving cavity and connects to the support plate, suitable for driving the support plate to move up and down within the receiving cavity. A first sealing element is provided on the outer side of the support plate, sealingly engaging with the inner wall of the lower base. The support plate, lower base, and upper crossbeam separate a vulcanizing chamber within the receiving cavity. The tire mold is placed within the vulcanizing chamber. One end of the vacuum tube extends into the receiving cavity and communicates with the vulcanizing chamber, while the other end of the vacuum tube is connected to the vacuum pump. This utility model, by setting up a vulcanizing chamber and providing seals at various points, achieves the necessary conditions for vacuum vulcanization, realizing the vacuum function of ordinary molds and improving the quality of tire vulcanization.

The present invention belongs to the technical field of variable displacement pumps, and in particular to a reciprocating vacuum pump. Through the bidirectional pushing effect of the compression spring on the end adapter block, both sides of the first fiber blade and the second fiber blade can be more closely fitted with the cavity through the rubber-coated roller. The inclined groove on the second fiber blade can accelerate the gas flow, and the rubber-coated roller can effectively reduce the friction of the contact surface with the wall, thereby reducing noise; the booster connecting pipe of the present application is a one-way air intake pipe, and the gas reflux in the gas flow channel can be filtered for gas impurities through an anti-return air filter cartridge, and the inner layer of the embedded groove on the outer side of the fixed valve seat can be filled with lubricating oil to improve the stability of the fixed valve seat and prevent the groove teeth from being worn due to shaking, thereby improving the sealing performance; the cleaning and replacement operation can be completed by opening the sealing cover and taking out the stainless steel sintered mesh, so that the device improves the stability of the vacuum pump operation.

The present invention discloses an LNG marine screw pump, comprising a pump body, a motor and a muffler mounted on the pump body, the pump body comprising a rotor assembly, a shell sleeved outside the rotor assembly, a front cover assembly located at one end of the rotor assembly and mounted on the shell, a side cover assembly located at the other end of the rotor assembly and mounted on the shell, a rear cover mounted on the side cover assembly, and a bearing gland mounted on the front cover assembly, wherein the rotor assembly is sealed in the pump body by a lip seal in conjunction with a special mechanical seal to achieve gas-liquid sealing; the rotor assembly comprises an active threaded rod and a driven threaded rod, the active threaded rod and the driven threaded rod are connected and transmitted by gears, and the active threaded rod and the driven threaded rod are meshed with each other, and the motor is mounted on the active threaded rod. The rotor assembly in the device is sealed in the pump body by a lip seal in conjunction with a special mechanical seal to achieve gas-liquid sealing, and the sealing effect is better.

The utility model provides a vacuum system of a pressure steam sterilizer, which relates to the technical field of pressure steam sterilization, and comprises a sterilizer main body, a vacuum pump, a vacuum pump, a vacuum pump, a vacuum pump and a vacuum pump, and the sterilizer main body is internally provided with a sterilization chamber which is of a cylindrical cavity structure; a pipeline system is arranged behind the sterilization chamber; a first condenser is arranged behind the sterilization chamber and is connected with the sterilization chamber through a pipeline system; a jet flow valve is arranged at the rear part of the sterilization chamber, the jet flow valve is connected with the water storage tank through a first circulating pipe, a second circulating pipe is connected with a second condenser, and a circulating pump provides power to circulate and vacuumize water vapor, so that the steam in the sterilization chamber can be removed, and the vacuumizing efficiency is effectively improved; the service life of the equipment is ensured, and the problems that the vacuumizing efficiency is reduced and the service life of the equipment is influenced due to water in the sterilization chamber in the vacuumizing process when the vacuum system of the existing pressure steam sterilizer is used are solved.