33 results about "Liquid-ring pump" patented technology

The invention provides a turbine pump and liquid ring pump series combination system and a control method thereof. Comprising a turbine pump, a condenser, a liquid ring pump, a heat exchanger, a steam-water separator, a control cabinet, a first variable frequency motor, a second variable frequency motor, a first pressure transmitter, a second pressure transmitter, a third pressure transmitter, a first temperature transmitter, a second temperature transmitter, a liquid level transmitter, a first electric control switch valve, a second electric control switch valve and a first electric control regulating valve. And a second electric control regulating valve and other components and related pipelines. By the adoption of the system formed by connecting the turbine pump (the front-stage pump) and the liquid ring pump (the rear-stage pump) in series and the control method of the system and monitoring the feature points of the front-stage pump and the rear-stage pump, the working conditions of the front-stage pump and the rear-stage pump can be adjusted in time, the phenomena of surge, stall, cavitation and the like are avoided, and therefore the energy consumption of the system is reduced, and the stability of the system is remarkably improved.

The utility model provides a vacuum breaking water stop valve. The vacuum breaking water stop valve comprises a valve body and a partition plate. The partition plate divides the internal space of the valve body into an air outlet channel and an air inlet channel, an outlet of the air outlet channel is located on one side of the bottom of the valve body, and an inlet of the air inlet channel is located on the other side of the top of the valve body. A connecting channel opening for communicating the air inlet channel with the air outlet channel is formed in the partition plate; a water return hole is formed in one side, close to the bottom of the valve body, of the partition plate; a floater is arranged below the connecting channel opening, and a connecting rod penetrating through the connecting channel opening is arranged above the floater; a vacuum breaking chamber is arranged at the top of the valve body, a vent hole is formed in a shell of the vacuum breaking chamber, and a connecting rod inlet and a sealing module for sealing the connecting rod inlet are arranged at the bottom of the vacuum breaking chamber; the upper end of the connecting rod penetrates through the connecting rod inlet and is fixedly connected with the sealing module. In the using process, vacuum breaking and water stopping can be automatically and rapidly achieved, water or other liquid is effectively prevented from damaging the liquid ring pump, and therefore the reliability of vacuum water diversion equipment is improved, and the service life of the vacuum water diversion equipment is prolonged.

This application provides a kiln tail high-temperature gas sampling and analysis instrument, comprising: a sampling probe assembly for inserting into the kiln tail flue to extract a high-temperature gas-sludge mixture; the sampling probe assembly includes a coaxially arranged outer sleeve and sampling tube, both of which are equipped with independent closed-loop cooling circuits; a pretreatment assembly connected to the outlet of the sampling probe assembly, including a pre-separation tank for preliminary gas-liquid-solid separation of the extracted gas-sludge mixture; and a purification and drying assembly connected to the pretreatment assembly, including a liquid ring pump, at least one ball filter, a gas-water separator, and a refrigerated air dryer for deep purification, moisture separation, and drying of the gas; the liquid ring pump is used to deliver the gas-sludge mixture at a high flow rate. This application solves the problems of traditional samplers being unable to withstand high-temperature shock, prone to clogging, requiring frequent maintenance, susceptible to sample contamination, and having slow response speed.

Systems and methods are provided for regenerating a bed containing absorbed and / or adsorbed CO2 using a low value steam stream. The steam stream can have a pressure of 10 kPa-a to 50 kPa-a and a temperature of 46° C. to 81° C. The steam stream can be used to displace CO2 from the bed, resulting in formation of a low pressure stream including water vapor and CO2. The stream containing water vapor and CO2 is then passed through a liquid ring pump that includes an associated ring cooler. The ring pump provides the suction necessary to draw the low value steam stream through the bed to displace the CO2. Due to the nature of operation of the liquid ring pump, the majority of water in the steam containing H2O and CO2 can be removed within the liquid ring pump, resulting in production of a stream comprising 90 vol % or more of CO2 at a pressure of 90 kPa-a or more. An example of a bed that can be regenerated using a low value steam stream is a bed that corresponds to a liquid amine that is coated on / covering / impregnated into a porous solid, so that the liquid amine remains substantially in place during a cycle of sorption and desorption of CO2.

This invention relates to the field of polyglycolic acid (PGA) synthesis technology, and more particularly to a PGA polymerization devolatilization system, comprising a steam jet vacuum system, a mixing condenser, a liquid ring pump, and a utility system. The steam jet vacuum system is connected at its inlet to the PGA polymerization reaction system and at its outlet to the mixing condenser inlet, used to separate unreacted monomers and low-molecular-weight byproducts and other volatiles. The mixing condenser gas outlet is connected to the liquid ring pump inlet, where condensable components are liquefied through condensation, and non-condensable gases are discharged. The liquid ring pump extracts non-condensable gases to maintain the system vacuum. The utility system integrates power steam pipelines, condensing medium pipelines, and insulation medium pipelines, providing power, condensation, and insulation support for each component. Through multi-stage jet compression, spray condensation, and insulation synergistic operation, the system improves mass transfer efficiency and process control precision, effectively removes volatiles, and enhances the purity, biodegradability, and mechanical properties of the PGA product.

The invention discloses a smoke abatement device capable of treating smoke of a roots pump testboard. The smoke abatement device is used in the roots pump testboard. The smoke abatement mechanism is connected with the roots pump test bench through a smoke collecting pipe. The smoke abatement mechanism comprises a rack, a smoke abatement device and a smoke abatement device, a liquid ring pump; a gas-water separator; the first connecting pipe is connected with the liquid ring pump and the gas-water separator; a second connecting pipe is connected with the gas-water separator and a cooler; a third connecting pipe is connected with the cooler and the liquid ring pump, one end of a fourth connecting pipe is connected with the liquid ring pump, and the other end of the fourth connecting pipe is connected with an external water supply device; a first control valve is positioned on the third connecting pipe; the second control valve is located on the fourth connecting pipe, and the controller is connected with the first control valve and the second control valve. The liquid ring pump, the first connecting pipe, the gas-water separator, the second connecting pipe, the cooler, the third connecting pipe and the liquid ring pump are connected into a whole in a closed loop mode.

The utility model relates to the technical field of flexible foam polyether polyol processing and production, in particular to a flexible foam polyether polyol reaction kettle vacuum unit which comprises a reaction kettle main body, an initiator input pipe is arranged at the top end of the reaction kettle main body, an epoxypropane input pipe is arranged on one side of the initiator input pipe, and an epoxypropane output pipe is arranged on the other side of the epoxypropane input pipe. A vacuum pipeline is arranged on one side of the epoxypropane input pipe and connected with a vacuum buffer tank, the vacuum buffer tank is connected with an input port of a roots pump, an output port of the roots pump is connected with a liquid ring pump, an output port of the liquid ring pump is connected with a spiral heat exchange assembly, an output port of the spiral heat exchange assembly is connected with a high-temperature storage tank, and the high-temperature storage tank is connected with a vacuum pump. An output port of the high-temperature storage tank is connected with a circulating pump, an output port of the circulating pump is provided with a connecting pipe, and by means of the structure of the spiral pipe, the liquid inlet pipe, the liquid outlet pipe, the high-temperature storage tank, the circulating pump and the connecting pipe, the problems that a traditional vacuum unit is low in waste gas waste heat recovery rate, lacks a preheating mechanism for raw materials and is serious in energy waste are solved.

The invention relates to a liquid ring pump (1) configured to circulate a fluid through a fluid circuit and comprising: a cylindrical body (2) having a liquid ring at the periphery of the inner volume (20); and at least one impeller (3) rotatably mounted eccentrically in the cylindrical body (2), the impeller (3) comprising a plurality of cavities (32), each being defined between two adjacent blades (31). The liquid ring pump (1) comprises an upstream sealing wall (4), fixedly connected to an upstream face (33) of the impeller (3), and a downstream sealing wall (5), fixedly connected to a downstream face (34) of the impeller (3), these walls being configured to close each cavity (32) of the impeller (3) respectively upstream and downstream. At least the upstream sealing wall (4) has a diameter (De) strictly smaller than a diameter (Dr) of the impeller (3), the diameter (De) of the upstream sealing wall (4) being determined so as to form, in the configuration of use, an intake duct (6) for the fluid (F) between an outer peripheral boundary (41) of the upstream sealing wall (4) and an inner peripheral boundary (Ll) of the liquid ring (W).

The utility model belongs to the technical field of polyester production equipment, and particularly relates to an energy-saving and anti-blocking vacuum system for polyester production, which comprises a three-stage steam jet pump, a liquid ring pump, a first ethylene glycol liquid seal tank, a second ethylene glycol liquid seal tank, a heat exchanger and an ethylene glycol recycling tank, the third-stage steam jet pump comprises a first-stage spray tower, a second-stage spray tower and a third-stage spray tower which are communicated in sequence, the first-stage spray tower and the second-stage spray tower are both communicated with the first ethylene glycol liquid seal tank, the third-stage spray tower is communicated with the second ethylene glycol liquid seal tank, ethylene glycol in the second ethylene glycol liquid seal tank enters the ethylene glycol recycling tank, and the second-stage spray tower is communicated with the third-stage spray tower. Part of ethylene glycol in the first ethylene glycol liquid seal tank enters the ethylene glycol recycling tank, part of ethylene glycol enters the heat exchanger, and ethylene glycol cooled by the heat exchanger returns to the third-stage steam-jet pump; and the pipeline between the heat exchanger and the third-stage steam-jet pump is communicated with a flushing pipeline. The vacuum system for polyester production can solve the problems that an existing vacuum system for polyester production wastes heat and is easy to block.

The utility model belongs to the technical field of liquid ring pumps, in particular to a double-support single-side dynamic seal liquid ring pump, which is characterized in that two ends of a pump body are fixedly connected with a front distribution plate and a rear distribution plate respectively, the front end of the front distribution plate is fixedly connected with a front side cover, and the rear end of the rear distribution plate is fixedly connected with a rear side cover; a rolling bearing or a first sliding bearing and a dynamic seal are arranged between the bearing seat and the pump shaft, the front side cover and the rear side cover are respectively provided with an air inlet and an air outlet, a second sliding bearing is arranged between the rear side cover and the pump shaft and arranged in a sliding bearing cavity of the rear side cover, and a sliding bearing gland is arranged at the tail end of the pump shaft. A sealing gland is arranged at the rear end of the rear side cover and fixedly connected with the rear side cover, and a static seal is arranged between the sealing gland and the rear side cover. According to the utility model, a non-driving end is changed into static sealing, so that the sealing effect is better and the cost is low; and the sliding bearing can be fully lubricated and flushed, the heating of the bearing is reduced, and the service life of the sliding bearing is prolonged.

The invention relates to a liquid ring pump (1) configured to circulate a fluid through a fluid circuit and comprising: a cylindrical body (2) defining an internal volume (20) filled with an operating liquid which, when in a use configuration, forms a liquid ring at the periphery of the internal volume (20); and at least one drive member (9) mounted eccentrically and in such a way as to be able to rotate in the cylindrical body (2), the drive member (9) comprising an impeller (3) comprising a plurality of cavities (32), each being defined between two adjacent blades (31). The drive member (9) comprises at least one plurality of upstream openings (91) for the fluid (F) to flow through the impeller (3), at least one plurality of downstream openings, for distributing the fluid (F), and at least one plurality of circulation channels each formed between an upstream opening (91) and a downstream opening, the angular positions of which are offset.

This invention provides a magnetically levitated shaftless liquid ring pump, comprising an end cover, a distribution plate, a pump body, and an impeller. The impeller is disposed within the pump body, the distribution plate is located at the front end of the impeller and is fixedly connected to the pump body, the end cover is located at the front end of the distribution plate and is fixedly connected to the pump body, and the end cover has a working fluid inlet. It also includes a magnetically levitated drive and a permanent magnet rotor module. The permanent magnet rotor module is disposed at the rear end of the impeller, and its front end is fixedly connected to the rear end of the impeller. The magnetically levitated drive is disposed at the rear end of the permanent magnet rotor module, and its front end is fitted onto the outer circumference of the permanent magnet rotor module. An isolation sealing cover is provided between the pump body and the magnetically levitated drive. This invention significantly reduces the risk of accidents during the operation of the liquid ring pump, greatly improves the stability and reliability of the liquid ring pump, and increases the efficiency of equipment operation. It eliminates the need for regular inspection and replacement of grease or lubricating oil; the equipment occupies less space, installation and maintenance are simpler, and the start-up cost is lower.

The invention discloses a multi-mode vacuum-pumping system for a plasma graphitization process, which relates to the technical field of vacuum acquisition and mainly comprises a high vacuum pump unit, a liquid ring pump unit, a vacuum main pipeline, a switching valve group and a system controller, the high vacuum pump unit and the liquid ring pump unit are connected in parallel to the vacuum main pipeline through the switching valve group, and the vacuum main pipeline is used for connecting the process reaction cavity. And the controller can control the switching valve group to switch the communication path according to the process requirement or the real-time pressure, and controls the start and stop of each pump. The high vacuum pump unit comprises at least two stages of vacuum pumps connected in series, the liquid ring pump unit is used for establishing and maintaining micro-negative pressure, and the high vacuum pump unit, the liquid ring pump unit and the switching valve group can be integrated on a common base. The method comprises the steps of mode switching, high-vacuum air exhaust and micro-negative pressure control, and a redundancy emergency mechanism is further arranged. The system is flexible in switching and accurate in control, can adapt to the requirements of each stage of the plasma graphitization process, and improves the stability and safety of the process.

A vacuum pump system 10 comprises a plurality of serially connected pump stages 12 arranged in parallel. An inlet 14 of each pump stage is connectable to a recipient. An outlet 26 of each pump stage is connected via a manifold 28 to an inlet 32 of an exhaust pump 30. The exhaust pump may be a dry pump, particularly a multistage roots pump, or a condenser pump, particularly a liquid ring pump. The pump stages and the exhaust pump may be arranged inside a housing. A pump control system and the exhaust pump may be inside a facility space of the housing. A controller 40 may control the fluid flow through and / or past the exhaust pump. A bypass 36 may be connected to the manifold to selectively bypass the exhaust pump and controlled by the controller. The controller may control a speed of the exhaust pump. Each pump stage may be a multistage pump stage comprising a plurality of pumps arranged in series, and may comprise a primary booster pump 20, particularly a mechanical booster pump, a secondary booster pump 22 and a backing pump 24, particularly a multistage dry pump. The vacuum pump system may be connected to a chamber of an extreme ultraviolet lithography vacuum system or a direct-air capture system. [Include figure 1]

The present invention belongs to the technical field of liquid ring pumps, and specifically relates to a key sealing device and sealing method for a rotary shell type liquid ring pump, comprising a bracket, a base mounted on the bracket, a pump casing assembled on one side of the base, a sealing shell provided on the side of the pump casing close to the base, and the sealing shell being located on the outside of the base, a bearing provided between the base and the sealing shell, and the base and the pump casing being sealed using any one of the following four sealing structures: a first sealing structure is sealed by a dynamic sealing structure, a second sealing structure is sealed by a magnetic fluid sealing structure, a third sealing structure is sealed by a sealing ring structure, and a fourth sealing structure is sealed by a combination of the above three sealing structures. The present invention can help achieve beneficial effects such as low starting torque, low friction resistance, and high sealing performance, thereby enabling the rotary shell type liquid ring pump to operate with low resistance and high efficiency.

The present application belongs to the technical field of liquid ring pump, especially to a liquid ring pump eccentricity adjusting method, comprising the following steps: step 1, setting the fixing mechanism at both ends of the pump body of the liquid ring pump into a flange plate form, eccentrically setting the inner cavity of the pump body of the liquid ring pump and the fixing mechanism at both ends thereof, the eccentricity value being a, then the maximum total eccentricity E1 of the liquid ring pump = e + a; step 2, calculating the optimal rotation angle through a formula, calculating the corresponding number of bolt holes C = α × Z / 360; step 3, rotating the liquid ring pump by the corresponding number of bolt holes C, thereby obtaining the optimal eccentricity value E2 = e + b, wherein b = a * cos (C * β). The present application adjusts the optimal installation angle, thereby realizing the adjustment of the optimal eccentricity value, and thereby realizing that the liquid ring pump can achieve the optimal working efficiency under different working speeds; the limit working point suction capacity of the liquid ring pump is greatly improved, and the working efficiency is also greatly improved.

The invention discloses an integrated universal tool jig for disassembling and assembling an impeller of a liquid ring vacuum pump and a using method of the integrated universal tool jig. The tool jig comprises a central shaft screw rod, an inclined disc, a disc-shaped protection plate and at least two countersunk head locking bolts, wherein the central shaft screw rod, the inclined disc, the disc-shaped protection plate and the countersunk head locking bolts can be disassembled and assembled. The two faces of the inclined disc are a large round face and a small round face respectively, an inclined slope face is arranged between the large round face and the small round face, a through screw hole penetrating through the large round face and the small round face is formed in the inclined disc, and the center shaft screw can be inserted into the through screw hole. When the impeller is disassembled, the small circular surface of the inclined disc faces the impeller, and when the impeller is installed, the large circular surface of the inclined disc faces the impeller. According to the liquid ring vacuum pump impeller disassembling and assembling integrated universal tool jig, the functions of disassembling and assembling the impeller are integrated, disassembling and assembling of liquid ring pumps of different sizes can be met, and the tool jig can also be used for maintaining many other devices.

The utility model relates to liquid ring pump processing technical field especially relates to a kind of liquid ring pump spare and part processing platform, this liquid ring pump spare and part processing platform includes gantry, two openings are set in the gantry, rotatable placing plate is provided in each opening, placing plate side is rotatably connected by first rotating shaft and first bearing seat, placing plate other side is rotatably connected by second rotating shaft and second bearing seat, first rotating shaft is connected by driving gear and push assembly. Sliding plate is slid along by telescopic member driving tooth plate, by the meshing of tooth plate and driving gear, drive first rotating shaft to rotate, and then drive placing plate to rotate, the inclination angle of placing plate can be accurately adjusted, ensure that angle is accurate when inclined hole is processed, avoid the damage of spare part due to angle deviation.

The invention relates to a method for removing reactive particles from a vacuum environment (14), in which a process gas is conveyed from the vacuum environment (14) by means of a vacuum pump (21, 22). The process gas is passed between the vacuum environment (14) and the vacuum pump (21, 22) through a first filter (31) and a second filter (32) to filter reactive particles from the process gas. A liquid ring pump (35) is used to discharge particles from the first filter (31) and the second filter (32). In a first phase of the method, the first filter (31) is active and the second filter (32) is passive; in a second phase of the method, the first filter (31) is passive and the second filter (32) is active. In the first phase, the process gas is passed through the first filter (31) and the liquid ring pump (35) discharges particles from the second filter (32). In the second phase, the process gas is passed through the second filter (32) and the liquid ring pump (35) discharges particles from the first filter (31). The invention also relates to a device for removing reactive particles from a vacuum environment and to a process system for producing monocrystalline silicon ingots.

The utility model belongs to the technical field of gas-water separation, and particularly relates to a simple self-control liquid level gas-water separator, which comprises a tank body, a gas outlet arranged on the upper end face of the tank body, a water replenishing port arranged in the middle of the front side and a vacuum pump water supply port arranged on the lower portion of the front side. An overflow port is formed in the middle of the back surface of the tank body; the air outlet, the air inlet and the overflow port are respectively provided with a standard upper connector and a standard lower connector which are sealed in a butt-clamping mode, and the water supplementing port is provided with a floater type automatic water supplementing switch which is arranged in the tank body. The automatic water replenishing tank is simple in structure, light in weight, convenient to install and low in manufacturing and production cost, and the float type automatic water replenishing switch and the overflow port are installed in the tank, so that the liquid level in the tank is automatically controlled; the tank body is made of a plastic material and has certain transparency, so that the internal liquid level condition is easy to check, and the tank body is particularly suitable for liquid ring pump units with simple working conditions, such as vacuum priming devices.

A liquid ring pump (1) configured to circulate a fluid in a fluid circuit and comprising: a cylindrical body (2) defining an internal volume (20) filled with a working fluid forming, in an operating configuration, a liquid ring around the periphery of the internal volume (20); and at least one drive element (9) mounted rotatably offset within the cylindrical body (2), the drive element (9) comprising an impeller (3) having a plurality of cavities (32), each being defined between two adjacent impellers (31). The drive element (9) includes at least a plurality of upstream openings (91) for the circulation of the fluid (F) in the impeller (3), at least a plurality of downstream openings for the distribution of the fluid (F), and at least a plurality of circulation channels formed each between an upstream opening (91) and a downstream opening whose angular positions are offset. (Shortcut figure: Figure 3)

A liquid ring pump (1) configured to circulate a fluid in a fluid circuit and comprising: a cylindrical body (2) defining an internal volume (20) filled with a working fluid forming, in an operating configuration, a liquid ring around the periphery of the internal volume (20); and at least one drive element (9) mounted rotatably offset within the cylindrical body (2), the drive element (9) comprising an impeller (3) having a plurality of cavities (32), each being defined between two adjacent impellers (31). The drive element (9) includes at least a plurality of upstream openings (91) for the circulation of the fluid (F) in the impeller (3), at least a plurality of downstream openings for the distribution of the fluid (F), and at least a plurality of circulation channels formed each between an upstream opening (91) and a downstream opening whose angular positions are offset. (Shortcut figure: Figure 3)

The invention discloses an aviation fuel pump with a self-adaptive liquid supplementing function. The aviation fuel pump comprises a centrifugal pump, a liquid ring pump and a motor. A shell is arranged behind a centrifugal pump, a motor is located behind the shell, a liquid ring pump is located in the shell, the centrifugal pump and the liquid ring pump are connected with the motor through a main shaft, a front liquid storage cavity is formed in the position, in front of the liquid ring pump, in the shell, and a rear liquid storage cavity is formed in the position, behind the liquid ring pump, in the shell; an installation area is arranged on a rear cover plate of the liquid ring pump, a backflow hole is formed in the installation area, a spring is arranged in the backflow hole, the front end of the spring is connected with a support and fixed to the rear cover plate through a fastening screw, the rear end of the spring is connected with a valve plate, and connection and disconnection of the backflow hole are achieved according to the vacuum degree in the pump. Self-adaptive liquid supplementing of the working liquid amount in a cavity of the liquid ring pump in the self-suction process of the fuel pump is achieved, the problem that in the prior art, vacuum deterioration is caused by liquid amount deficiency of the pump is solved, and the self-suction performance of the aviation fuel pump is improved.

Disclosed in the present invention is a multi-objective optimization method for a liquid-ring combined pump. By taking a head coefficient of a main centrifugal pump and the stress of an impeller as co

The invention belongs to the technical field of liquid variable-capacity machinery, and particularly relates to a two-stage liquid ring pump of a nested structure, which comprises a shell, a first-stage impeller and a second-stage impeller are arranged in the shell, the second-stage impeller is nested outside the first-stage impeller, and a first-stage pump cavity is formed between the second-stage impeller and the first-stage impeller; a motor is arranged on one side of the shell, a driving gear is further fixedly arranged on an output shaft of the motor and is in transmission connection with the second-stage impeller sequentially through a first-stage transmission gear and a second-stage transmission gear, an end cover is arranged at the end, away from the motor, of the shell, and a distribution disc is arranged between the end cover and the shell. A first-stage pump cavity suction hole, a first-stage pump cavity exhaust hole, a second-stage pump cavity suction hole and a second-stage pump cavity exhaust hole are formed in the distribution disc, and a plurality of rib plates are arranged in the end cover. The device can reduce flow resistance and energy loss, and avoids the backflow phenomenon of the shaft hole.

A control system comprising: a suction line (28); a discharge line (30); an operating liquid line (32); a liquid ring pump (10) coupled to the suction, discharge, and operating liquid lines; a regulating device configured to control flow of operating liquid into the liquid ring pump (10); a pressure sensor (22) configured to measure pressure of input fluid to the liquid ring pump (10) via the suction line (28); a first temperature sensor (24) configured to measure temperature of discharge fluid output by the liquid ring pump (10) via the discharge line (30); a second temperature sensor (26) configured to measure temperature of operating liquid received by the liquid ring pump (10) via the operating liquid line (32); and a controller (20) configured to: control the one or more regulating devices using the sensor measurements.

The utility model belongs to the technical field of liquid ring pumps, and particularly relates to a turbine and liquid ring pump series system which comprises a turbine and a liquid ring pump, one end of the turbine is connected with a main air inlet through a first air inlet pipeline, and the other end of the turbine is connected with an air inlet of the liquid ring pump through a second air inlet pipeline. An exhaust port of the liquid ring pump is connected with an air inlet of the air-water separator through a third air inlet pipeline, and an exhaust port of the air-water separator is connected with a main exhaust port through an exhaust pipeline; a water outlet of the gas-water separator is communicated with the outside through a water drainage pipeline, a water supply port of the liquid ring pump is connected with external water supplement through a water supply pipeline, a check valve and a pressure gauge are arranged on the second gas inlet pipeline, and the pressure gauge is arranged between the turbine and the check valve. The vacuum pump can achieve high vacuum without cavitation, is more energy-saving, and can replace a roots pump, a steam-jet pump, an atmosphere ejector series liquid ring pump or a two-stage liquid ring pump; the turbine can increase the number of stages without increasing the number of motors, so that the suction rate is increased.

A system (2) includes: a suction line (34); a liquid ring pump (10) connected to the suction line (34), the liquid ring pump (10) including a chamber (102) and an impeller (106) mounted in the chamber (102); a check valve (6) arranged to allow fluid to flow into the chamber (102) via the suction line (34) and to prevent or stop fluid from flowing out of the chamber (102) to the suction line (34); a gas line (36) connected to the liquid ring pump (10) to allow gas to flow into the liquid ring pump (10) via the gas line (36), the gas line (36) connecting to the liquid ring pump (10) between the check valve (6) and the chamber (102); a valve (8) disposed on the gas line (36); and a controller (20) configured to control the valve (8). The system is ideal for preventing or stopping the tendency of cavitation during startup in the liquid ring pump.

The invention provides a CVD reaction waste gas neutralization treatment system. The system comprises a cold trap, a waste gas pressure control device and a neutralization reaction device which are connected in sequence, the neutralization reaction device is internally provided with an alkali liquor pool, a spray tower, a liquid ring pump connected with the spray tower, a chemical pump connected with the alkali liquor pool and a neutralization filtering tank, and the liquid ring pump sucks waste gas and discharges the waste gas to the spray tower; a chemical pump pumps one part of alkali liquor in the alkali liquor pool to the top of the spray tower to react with waste gas, one part of the alkali liquor participates in the reaction in advance in the liquid ring pump after heat exchange, and the other part of the alkali liquor enters the alkali liquor pool after being filtered by the neutralization filtering tank. The cooling efficiency of the reaction waste gas is improved through the cold trap, so that the reaction waste gas is efficiently cooled, metal compound deposition caused by temperature reduction is efficiently collected, and the corrosion influence on a subsequent device is reduced; alkali liquor in the alkali liquor pool and alkali liquor for maintenance can be recycled after being filtered; by arranging the pressure control device, the vacuum degree of the reaction waste gas is controlled according to the process requirement, so that the deposition efficiency is controlled, and the problems of alkali liquor pollution and alkali liquor recovery treatment are effectively avoided.

This application discloses a device and method for treating volatile organic compounds (VOCs) in naphtha storage tanks, mainly relating to the field of VOC treatment technology for oil storage tanks. It addresses the problem that most existing methods extract VOCs after they are generated in the liquid state of the storage tank, failing to reduce VOCs at the source. The device includes: a buffer tank pump connected to a first transfer pump; the first transfer pump is also connected to a feed heat exchanger; the feed heat exchanger is also connected to a stabilizer tower and a cooler; the stabilizer tower is also connected to a reboiler, an air cooler, and a second transfer pump; the reboiler is connected to an asphalt constant-temperature oil transfer device; the air cooler is connected to a reflux tank; and the reflux tank is also connected to the second transfer pump, an asphalt three-top gas-liquid ring pump, and a heavy, low-quality oil device.