798results about "Priming pump" patented technology

An aeronautical thruster of longitudinal axis has a hub, an annular row of unducted upstream rotor blades and an annular row of unducted downstream stator blades. Each downstream stator blade is of variable pitch, and at least one of the downstream stator blades is in a closed-pitch configuration relative to another of the downstream stator blades in that it has a pitch angle smaller than the pitch angle of the other downstream stator blade.

A blood pump with a stator and rotor wherein the rotor is assembled by bonding the stator components with epoxy. The bonding surfaces of the rotor components are primed with a silane-based primer to improve adhesion between the primer and the rotor components by rendering such surfaces hydrophobic. A bonding surface of one of the stator yoke or the stator sleeve, or both, is treated with a primer that improves wettability of the bonding surface and improves bonding of the epoxy to the binding surface. The device has a bonding surface adhered to epoxy in which a primer was applied on such bonding surface prior to introducing epoxy onto the bonding surface. In addition to improved bond strength, hydrophobic surface would control moister ingress.

The invention discloses a rotary spraying pump with a rotor cavity air rapid emptying function, and belongs to the technical field of rotary spraying pumps. Liquid in a tank body is reduced, so that a sealing plug moves downwards along with the liquid level, torsion of a torsion spring drives a brush and a spraying pipe to rotate through a water conveying cavity, the cleaning area of the brush on a filter screen is increased, and the cleaning efficiency is improved. When the convex surface of the cam is far away from the roller, the piston is reset upwards, so that the cam is matched with the second spring, the piston moves up and down for reciprocating drainage, and liquid is discharged through a two-way one-way pipe; secondly, a sealing plug is downward and can drive a sliding rail and a ball to move through a rope, the ball drives a rotating roller to rotate through an arc-shaped groove, a gear and a tooth valve are in transmission, a water inlet pipe can be opened, and therefore the water inlet pipe can be connected with a water source; and the automatic water feeding operation can be conveniently realized.

A miniature impeller submersible pump comprises a pump body, a filter cover, a motor, a closed impeller, a check valve and a blanking cap. A water inlet cavity is formed between the filter cover and the pump body; a water passing cavity is formed in the pump body; a water passing part protruding downwards is arranged at the bottom of the pump body, and an annular space is formed between the outer wall of the water passing part and the side wall of the water inlet cavity; a water outlet part is arranged at the top of the pump body; a water passing opening is formed in the water passing part and communicates with the water inlet cavity and the water passing cavity; a non-return channel is arranged in the water outlet part, and a non-return valve is mounted in the non-return channel; a motor is mounted in the pump body; a power output end of the motor is in transmission connection with the closed impeller; and the blanking cap covers and blocks the annular space. Therefore, the closed impeller is arranged to improve the pressure of the water pump, and normal work of the submersible pump is ensured.

An apparatus for an aircraft powerplant includes an impeller rotor and a seal runner. The impeller rotor includes a plurality of fluid circuits. Each of the fluid circuits includes a first outlet passage, a second outlet passage and an inlet passage fluidly coupled to the first outlet passage and the second outlet passage in parallel. The seal runner includes a bore, an inner guide surface and an outer land surface. The seal runner extends circumferentially about the axis and radially between the inner guide surface and the outer land surface. The bore is fluidly coupled to the first outlet passage of each fluid circuit. The inner guide surface forms a radial outer peripheral boundary of the bore. The inner guide surface radially diverges away from the axis as the inner guide surface extends axially away from the impeller rotor and to a distal end of the seal runner.

Intake and gas separators for a downhole rotary pump define a fluid flowpath and comprise two or more intake stages arranged in parallel, with two or more of the intake stages each having one or more impeller. Multiple intakes may be configured in parallel and series, in some cases being provided as compact axial length gas separators.

The utility model relates to an antifreeze vortex self-priming booster pump, comprising a pump motor, a pump body and an impeller, wherein the pump motor is provided with a pump body mounted on one end of the main shaft, an impeller is mounted in the lower part of the pump body, the main shaft of the pump motor is inserted into the pump body and connected to the impeller, an air tank docked with the upper part of the pump body is mounted on the upper rear part of the pump motor, a temperature and pressure sensor docked with the pump body is mounted on the front side of the air tank, a water inlet and outlet are arranged on the upper rear side of the pump body and the upper front end of the pump body, the air tank comprises an air tank sealing cover, a water storage bag and an air tank body, a water storage bag is mounted on one side of the air tank sealing cover, and an air tank body wrapped with the water storage bag is mounted on the side of the air tank sealing cover where the water storage bag is mounted. The utility model has the characteristics of automatically adapting to the temperature of the working environment and preventing freezing and cracking.

The utility model relates to the technical field of self-priming pumps, in particular to an open impeller flow guide structure for a horizontal self-priming pump, which comprises an impeller body and a flow guide component. The impeller body comprises a connecting part used for being connected with a main shaft, and the impeller body rotates to form an impeller runner; the flow guide component comprises a flow guide plate body and two arc-shaped guide vanes, the flow guide plate body and the impeller body are coaxially arranged, the two arc-shaped guide vanes are arranged in the circumferential direction of the flow guide plate body, the two arc-shaped guide vanes are both arranged on the outer side of the impeller body, the two arc-shaped guide vanes are arranged in a staggered mode in the radial direction, and a guide vane channel is formed between every two adjacent arc-shaped guide vanes. A guide vane passageway is formed on the outer side of the arc-shaped guide vane, an inlet of the guide vane passageway is communicated with an outlet of the impeller passageway, and an outlet of the guide vane passageway is communicated with the guide vane passageway. The utility model is favorable for discharging the gas-liquid mixture, reducing the vibration of the pump, prolonging the service life of the pump and reducing the noise.

The invention relates to the technical field of self-sucking pumps, in particular to an efficient vacuum energy-saving self-sucking pump which comprises a base, a first pump cavity, a motor, a rain baffle, a first impeller, a compensation assembly and a drainage assembly, the first pump cavity, the motor and the rain baffle are sequentially installed at the upper end of the base, and the first impeller is installed at the axis position in the first pump cavity; the drainage assembly is installed at the lower end of the first impeller, and the two compensation assemblies are installed in the drainage assembly. After the drainage assembly is started, the drainage assembly is used for guiding the liquid level to overflow the first impeller and removing large-particle solids in fluid, and the compensation assembly drives the first impeller to move downwards to reduce the gap when detecting that the gap between the first impeller and the inner wall of the first pump cavity is enlarged. The tip end of the blade is easily and continuously washed by solid particles, so that the flow and lift of the core pump are reduced, and the efficiency is obviously reduced.

The invention relates to a vertical water-cooling self-priming pump, and belongs to the technical field of fluid conveying. Comprising an upper liquid storage cylinder and a lower liquid storage cylinder which are fixedly connected, a water inlet pipe is arranged on the rear side of the lower liquid storage cylinder, a discharge pipe is arranged on the front side of the lower liquid storage cylinder, a water outlet pipe is arranged on the front side of the upper liquid storage cylinder, and an exhaust valve is arranged at the top of the upper liquid storage cylinder; a water-cooled motor is fixedly arranged in the upper liquid storage cylinder, a multi-stage water pump is arranged in the lower liquid storage cylinder and connected with the water-cooled motor through a coupling assembly, and a supporting assembly is arranged between the water-cooled motor and the inner wall of the upper liquid storage cylinder; an overflow protection assembly is arranged at one end, away from the lower liquid storage cylinder, of the water inlet pipe; the problems that an existing self-priming pump is unstable in installation of a special-shaped motor, high in requirement for the environment of a cooling system, low in lift, unstable in long-time operation and liquid overflows when the self-priming pump is closed are solved.

The utility model discloses a branch pipeline utilizing a centrifugal pump to adjust flow, which comprises a main water tank, a water outlet pipe is arranged at the bottom of the main water tank, the side face of the water outlet pipe is connected with a water outlet branch pipe through a centrifugal pump, and a return pipe is connected between the water outlet branch pipe and the upper end of the main water tank. According to the utility model, the combination of the return pipe and the flow velocity sensor is introduced, so that unstable water flow can be automatically guided back to the main water tank at the initial stage of starting of the centrifugal pump, and the damage to the water outlet branch pipe caused by water flow impact is effectively avoided. By means of the design, the aging speed of the pipeline is remarkably reduced, the service life of the pipeline is prolonged, and the maintenance cost and the water cut-off time caused by pipeline damage are reduced.

The invention discloses an energy-saving air conditioner fan circulating water pump and a control method, and relates to the technical field of energy-saving household appliances, and the energy-saving air conditioner fan circulating water pump comprises a motor, a peristaltic pump shell, a peristaltic pump rotor and a centrifugal pump shell. The front end of the motor output shaft is connected with a fan; a plurality of extrusion wheels are arranged on the peripheral side of the peristaltic pump rotor, when the peristaltic pump rotor is in a first state, the extrusion wheels are matched with the peristaltic pump shell to extrude the elastic hose, the peristaltic pump rotor is in transmission connection with the output shaft, and when the peristaltic pump rotor is in a second state, the peristaltic pump rotor is separated from the output shaft; the extrusion wheel is separated from the elastic hose, the centrifugal pump shell is connected to the rear end of the peristaltic pump shell, an impeller is arranged in the centrifugal pump shell and connected to the rear end of the output shaft, the centrifugal pump shell is connected with a first water inlet pipe and a first water outlet pipe, and the first water outlet pipe is communicated with the water inlet end of the elastic hose. According to the centrifugal pump, one motor can be used for driving the fan and the impeller in the centrifugal pump shell, and energy consumption is reduced.

The utility model discloses a novel high-efficiency self-priming pump which is not afraid of gas and can intermittently draw suction, belongs to the technical field of self-priming pumps, comprises a pump body, a liquid outlet pipe is arranged at the top of the pump body, a stepper motor is fixedly installed at the bottom of the pump body, the output shaft of the stepper motor is fixedly connected with a rotating rod, the outer surface of the rotating rod is rotatably connected to the outer side wall of the pump body through a rotating shaft, the other end of the rotating rod passes through the pump body and is fixedly connected with an impeller, a liquid inlet pipe is arranged on the side of the pump body away from the stepper motor, a one-way valve is installed on the outer surface of the liquid inlet pipe, a cover plate is arranged at the top of the pump body, a liquid adding assembly and a gas-liquid balance assembly are arranged on the upper surface of the cover plate, a liquid storage chamber, a gas-liquid separation chamber and a high-pressure chamber are respectively opened inside the pump body, thereby improving the stability of the self-priming pump during operation, realizing intermittent suction and being able to work continuously without secondary emptying after inhaling air, thereby improving the working efficiency of the self-priming pump.

Systems and methods described herein provide a smart vacuum priming system for centrifugal pumps. The vacuum priming system includes a vacuum pump, a suction assembly, an electromagnetic clutch assembly, and a pressure sensor. The suction assembly provides fluid communication between the vacuum pump and a float box of the centrifugal pump. The electromagnetic clutch assembly selectively engages the vacuum pump, such that a drive shaft of the centrifugal pump also powers the vacuum pump when the clutch is on. The pressure sensor indicates when the centrifugal pump is in a primed state based on a discharge pressure of the centrifugal pump. When the pressure sensor indicates the main pump is in the primed state, the electromagnetic clutch decouples the vacuum pump from the drive shaft. When the pressure sensor indicates the main pump is not in the primed state, the electromagnetic clutch couples the vacuum pump to the drive shaft.

The invention discloses a self-priming pump which comprises a pump shell, an impeller and a driving motor. The pump shell is provided with a cavity and a suction flow channel located in the cavity, a driving cavity is formed in the outer wall face of the pump shell and faces the interior of the cavity in a concave mode, the cavity, the driving cavity and the suction flow channel are sequentially communicated, the cavity and the suction flow channel are each provided with a communication opening communicated with the outside, and the side, away from the cavity, of the driving cavity is open. The impeller is rotationally arranged in the driving cavity around the axial direction of the impeller and can drive fluid to sequentially flow through the suction flow channel, the driving cavity and the cavity during rotation; a shell of the driving motor covers the opening of the driving cavity, and a rotating shaft of the driving motor extends into the driving cavity from the interior of the shell, is connected to the impeller and is used for driving the impeller to rotate in the axial direction of the driving motor. According to the scheme, a coupler is not needed for transmission, vibration abnormal sound caused by misalignment of a shaft system is avoided, meanwhile, the overall structure of the self-priming pump is more compact, the size and weight of the self-priming pump are reduced, the space occupied by the overall structure is reduced, installation in narrow space areas such as a marine engine room is facilitated, and practicability is improved.

The utility model discloses a pit vacuum pump which comprises a vacuum tank provided with a connecting pipe, the connecting pipe is provided with an inserting pipe, and a static ring is arranged in the inserting pipe in a sliding mode. A movable ring is rotationally arranged in the liquid inlet pipe; the sealing device further comprises springs which are symmetrically arranged on the static ring, and the static ring is attached to the end face of the movable ring under pushing of the springs. According to the pit vacuum pump provided by the utility model, through the arrangement of the vacuum tank, the phenomenon that the self-suction force of the pump body is insufficient is eliminated, the overall suction effect is improved, meanwhile, the air binding phenomenon and the dry grinding condition of equipment are avoided, vibration is reduced, the operation period is prolonged, and pump filling during first-time starting is realized; pumping and exhausting are not needed during each start and stop, so that time and manpower are greatly saved.

The invention discloses a self-suction type magnetic suspension pumping device which comprises a magnetic suspension pump, a self-suction pump and a controller, the magnetic suspension pump comprises a pump head and a magnetic suspension motor, the pump head is provided with a first inlet and a first outlet, the self-suction pump is provided with a second inlet and a second outlet, and the second inlet of the self-suction pump is connected with the first outlet of the magnetic suspension pump in series; the controller is configured to control the working states of the magnetic suspension pump and the self-priming pump, and the self-priming pump is configured to suck a medium in a pump head of the magnetic suspension pump to form negative pressure, so that to-be-conveyed fluid enters the pump head through the first inlet, and the magnetic suspension pump completes self-priming; after the magnetic suspension pump completes self-absorption, the output fluid is subjected to follow flow through the follow flow bypass; or after the magnetic suspension pump completes self-priming, the output fluid flows through the straight-through flow channel of the self-priming pump. According to the invention, the self-absorption function of the magnetic suspension pump is realized on the premise of not influencing the original performance of the magnetic suspension pump and not introducing particulate matter pollution or increasing shear force in the ultra-clean environment application of biological medicine or semiconductor manufacturing and the like.

The utility model discloses a self-priming pump water diversion tank water suction system which comprises a water suction pool and a vacuum water diversion tank, the vacuum water diversion tank is connected with one end of a water suction pipe, the other end of the water suction pipe is arranged at the pool bottom of the water suction pool, the input end of a self-priming pump is connected with one end of a self-priming pump water suction pipe, and the other end of the self-priming pump water suction pipe is communicated with the bottom of the vacuum water diversion tank. The output end of the self-priming pump is connected with a self-priming pump drainage pipe, the self-priming pump is installed on a pump foundation, and the joint of the vacuum water diversion tank and the water suction pipe and the self-sealing overflow pipe are located at the same height. The water outlet of the lifting water pump is stable, and the problems that the water outlet of the lifting water pump is unstable and the lifting water pump cannot lift water are solved; and after the self-priming pump is stopped, the self-priming pump can be started without refilling the pump next time, the idling phenomenon is avoided, meanwhile, the whole self-priming pump is automatically controlled, the operation is convenient, and time and labor are saved.

The invention relates to the field of chemical pumps, in particular to a chemical pump with a lining assembly, comprising a driving mechanism used for driving a pump body; the separating mechanism is used for separating and conveying the liquid; the driving mechanism is connected with the separating mechanism, and supporting tables are fixedly mounted at the bottoms of the driving mechanism and the separating mechanism; wherein the driving mechanism comprises a rack, the rack is arranged at the top of the supporting table, a servo motor is fixedly connected to the top of the rack, and a shaft sleeve disc is fixedly connected to the outer side of the output end of the servo motor. And then, the compensation rod drives the insertion rod to stretch the spring, so that the compensation rod extends out of the interior of the spline block, and the function of preparing for subsequent separation of the spline block and the shaft sleeve disc is achieved.

The invention relates to the technical field of self-priming pumps, in particular to a horizontal self-priming pump which comprises a pump body, a wear-resisting plate, a flow guide component, a shaft and an impeller. The wear-resisting plate is arranged at an outlet of the liquid inlet runner; the flow guide component comprises a flow guide plate body and more than two arc-shaped guide vanes which are uniformly distributed in the circumferential direction of the flow guide plate body, the arc-shaped guide vanes are arranged in a staggered manner, a guide vane channel is formed between every two adjacent arc-shaped guide vanes, an inlet of each guide vane channel is communicated with the liquid inlet runner, and an outlet of each guide vane channel is communicated with the gas-liquid separation cavity; the shaft extends into the pump body and is connected with a driving device; the impeller is connected with the shaft, is arranged between the wear-resisting plate and the guide plate body and is located on the inner side of the arc-shaped guide vane, and the impeller rotates to lead fluid in the liquid inlet flow channel to the tip end of the impeller and send the fluid to the gas-liquid separation cavity through the guide vane channel. Gas-liquid mixtures can be discharged easily, vibration of the pump is reduced, the service life of the pump is prolonged, and noise is reduced.

The invention relates to the field of self-priming pumps, in particular to a centrifugal fan combined type self-priming energy-saving pump which comprises a servo motor, the output end of the servo motor is connected with a coupler, and a middle shaft is embedded in the end, away from the servo motor, of the coupler in a matched mode. The bearing frame is used for supporting the intermediate shaft, and the interior of the bearing frame is in extrusion fit with the intermediate shaft; the end, away from the coupler, of the middle shaft is fixedly connected with a rotating shaft. According to the centrifugal fan combined type self-suction energy-saving pump, liquid stored in the space defined by the fixed disc and the butt joint disc can be pushed into the pump body from the center of the fixed disc through the butt joint disc, the liquid can be sucked into the pump body through the butt joint disc, and the liquid can be sucked into the pump body through the butt joint disc. Therefore, the guide liquid can conveniently enter the pump body and can be automatically supplemented, preparation is made for starting of the pump next time, and the effect of manually supplementing water again is not needed.

The utility model discloses a noise reduction type horizontal self-priming pump which comprises a body fixedly installed on the upper surface of a connecting plate and further comprises a buffering cushion block, the buffering cushion block is installed on the lower surface of the connecting plate, and the connecting plate is connected with a noise reduction structure. The noise reduction structure can be connected with the soundproof cover through the mounting groove to isolate noise generated by the body, the noise reduction structure comprises the mounting groove, the mounting groove is formed in the upper surface of the connecting plate, the opening of the mounting groove corresponds to the thickness of the lower end of the soundproof cover, and the lower end of the soundproof cover is inserted into the mounting groove; and sound-absorbing cotton is mounted on the surface of the inner wall of the sound-proof cover. According to the noise reduction type horizontal self-priming pump, the noise reduction structure is arranged, the sound insulation cover can be fully clamped by the expansion bag to be mounted in the mounting groove through the mounting groove of the connecting plate, noise is isolated, the fixing structure is further arranged, and the limiting rod can sequentially penetrate through the opening holes of the limiting block to limit and reinforce the fixing bolt.

The present invention relates to a method of starting a submersible pump used for transferring liquefied gas. The method includes starting a submersible pump (1A) disposed in a suction container (2A) of a pump apparatus (100A) to deliver liquefied gas to a suction container (2B) of a pump apparatus (100B) through a flow-path switching device (5A) in the suction container (2A), passing the liquefied gas through a flow-path switching device (5B) in the suction container (2B) while the liquefied gas bypasses a submersible pump (1B) disposed in the suction container (2B), and then starting the submersible pump (1B).

The invention relates to the technical field of centrifugal pumps, in particular to a self-suction centrifugal pump with a self-cleaning function, which comprises a motor, a pump body fixedly connected to the output shaft end of the motor, an inlet pipe fixedly connected to the left end of the pump body through a flange plate, a filter plate fixedly connected to the inside of the inlet pipe, and a cleaning box fixedly connected to the side wall of the inlet pipe. A cleaning head is arranged in the cleaning box and used for cleaning the filter plate, a power driving mechanism is arranged in the inlet pipe and used for driving the cleaning head to move up and down in a reciprocating mode, and the power driving mechanism comprises a connecting assembly and turbine blades. Large particles can be intercepted through the arranged filter plate, so that the problem that when water containing large-particle gravel is sucked, the solid particles can abrade the impeller can be avoided, meanwhile, the cleaning head driven by the power driving mechanism reciprocates up and down, the filter plate can be automatically cleaned, and the cleaning efficiency is improved. Therefore, the problem of blockage caused by large sand can be avoided.

The invention discloses a decentralized discharge source sewage collection-A2O treatment linkage system and a treatment method. The linkage system comprises a sewage pretreatment and pipe network collection system, an A2O treatment system and a discharge system. By adopting a negative pressure collection technology, the sewage collection problem caused by complex terrain in a sewage collection range is solved, and the sewage collection efficiency is improved; the gas stripping technology, the Venturi technology and the siphon technology are creatively applied to the sewage process, and sewage collection and sewage lifting, muddy water backflow and oxygenation in the A2O process can be achieved only through one self-priming pump; the Venturi jet device directly performs jet aeration on the aerobic tower, so that the dependence on a high-energy-consumption mechanical aeration fan is reduced, and resource waste and material loss are avoided; meanwhile, distribution of water flow and dissolved oxygen in the reaction tank is optimized, natural circulation is formed through the density difference between the aerobic tower and the anoxic tower, additional power is not needed, the energy consumption is reduced, meanwhile, the nitrogen and phosphorus removal process is promoted, and the treatment efficiency is remarkably improved.

The invention relates to the technical field of vacuum water diversion, in particular to a vacuumizing node device capable of automatically controlling a water level and a using method of the vacuumizing node device. The water pump is connected to the water inlet pipe, is higher than the water inlet pipe and comprises a node tank, and the bottom of the node tank is connected with the water pump; one end of the exhaust pipeline is connected to the top of the node tank, the other end of the exhaust pipeline is connected to the vacuum pump unit, and an electromagnetic valve is arranged on the exhaust pipeline; the liquid level meter is connected with the control system, and the liquid level meter is used for detecting whether water in the node tank reaches the lowest water level and the highest water level or not and sending a detection signal to the control system, so that the control system judges whether the electromagnetic valve is opened or not to extract air in the node tank so as to raise the water level in the node tank. The node tank has the advantages that the lowest water level and the highest water level in the node tank are detected by arranging the liquid level meter, the water level is controlled between the lowest water level and the highest water level, the situation that a single liquid level meter is arranged, an electromagnetic valve is opened after the water level is slightly lowered, and air exhaust is conducted in the node tank is avoided, and frequent opening of the electromagnetic valve is avoided.

The utility model discloses a novel vacuum water diversion device which comprises a gas-water separation tank, a vacuum pump, a controller and an electromagnetic valve assembly, the controller is electrically connected with the vacuum pump and the electromagnetic valve assembly, a liquid level control sensor is arranged in the middle of the gas-water separation tank, and the electromagnetic valve assembly comprises an exhaust valve, a vacuum valve and a pressure release valve. The exhaust valve is connected between the gas-water separation tank and equipment to be vacuumized through a gas pipe, the vacuum valve is connected between the gas-water separation tank and the vacuum pump through a gas pipe, and the pressure release valve is connected between the gas-water separation tank and the atmospheric environment through a gas pipe; the controller controls the working states of the vacuum pump and the electromagnetic valve assembly according to the read signals of the liquid level control sensor. The vacuum water diversion device can be widely applied to any area needing vacuum water diversion, is not limited to a centrifugal pump, is clear in control logic, convenient to use, safe and reliable, does not need additional intervention of a user, and can automatically discharge liquid in the air-water separation tank after one-time vacuum water diversion is completed so as to guarantee frequent repeated use of the device.

The invention provides a shield pump, and belongs to the technical field of water pumps. A shield pump comprises a motor shell, a pump body, a junction box and an exhaust pipe, a pump cavity communicated with the outside is formed in the pump body, a rotating shaft with an air passing channel is arranged in the motor shell, the rotating shaft is sleeved with a shielding sleeve fixed in the motor shell, a cavity communicated with the pump cavity is formed between the rotating shaft and the shielding sleeve, and the exhaust pipe is communicated with the cavity. The lower end of the exhaust pipe is inserted into the top of the shielding sleeve and is welded and positioned on the shielding sleeve, the junction box is detachably connected to the top of the motor shell, a positioning hole coaxial with the exhaust pipe is formed in the junction box, the upper end of the exhaust pipe is inserted and positioned in the positioning hole and is in sealed connection with the positioning hole through a sealing piece, and a deflation bolt is inserted into the top of the junction box; and the deflation bolt is screwed at the upper end of the exhaust pipe. Through welding of the exhaust pipe and the shielding sleeve and the positioning hole of the junction box, the exhaust pipe and the rotating shaft, the shield pump which is more stable in operation is provided.

The present invention discloses a cavitation elimination device and system for underground water pumps in coal mines, which does not require water filling and does not require a bottom valve. The device comprises a negative pressure water storage tank and a negative pressure water inlet pipe. The negative pressure water storage tank may optionally be provided with a water inlet at the top or bottom. The first end of the negative pressure water inlet pipe extends below the liquid level of the lower water tank, and the second end of the negative pressure water inlet pipe is connected to the water inlet. A water outlet is provided on one side of the lower end of the negative pressure water storage tank, and a liquid replenishment pipe and an exhaust pipe are provided on the top of the negative pressure water storage tank. The present invention places the water suction level of the water pump in advance, and the liquid level in the device is always higher than the water pump plane, thereby increasing the cavitation margin of the water pump device and reducing or eliminating the harm of cavitation to the water pump. Before the water pump is started, the cavity is always filled with liquid, and there is no need to fill it with water. The vacuum pump and jet pump can be omitted, and the control process is optimized. At the same time, the device eliminates the bottom valve, eliminating the safety hazards of the bottom valve being damaged and unable to fill it with water and the bottom valve maintenance process, thereby achieving the purpose of rapid start-up and safe operation of the water pump.