595results 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 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 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 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 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 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.

The utility model discloses an automatic liquid adding device of a self-priming pump, which comprises a self-priming pump body, the self-priming pump body is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end is connected with a liquid inlet pipe, the liquid outlet end is connected with a liquid outlet tee joint, the other two connectors of the liquid outlet tee joint are respectively connected with a liquid outlet pipe and a liquid storage tank, the liquid outlet pipe is connected with a liquid supplementing branch pipe, and the liquid supplementing branch pipe is connected with a liquid supplementing pipeline. The other end of the liquid supplementing branch pipe is communicated with the liquid storage tank, and an electromagnetic valve is installed on the liquid supplementing branch pipe and is in linkage control with a metal electrode bar fixed to the top of the liquid storage tank. By the adoption of the device, automatic liquid supplementing can be achieved subsequently only by filling the pump shell with the solution when the self-priming pump is installed, the problem that the self-priming pump can work only by adding the solution into the liquid storage tank every time before being started is solved, and the working efficiency is improved.

The fire pump comprises a motor and a pump body, the pump body is in transmission connection with the motor, the manual-automatic integrated exhaust valve is installed at the position, close to the top of the pump body, of the pump body, and the manual-automatic integrated exhaust valve comprises an exhaust valve body, an exhaust connector, an exhaust pipe and an automatic exhaust mechanism. The bottom of the exhaust valve body is communicated with the pump body through an exhaust pipe, and the exhaust connector is installed on the top of the exhaust valve body and provided with an automatic exhaust hole leading to the exhaust valve body. The automatic exhaust mechanism is installed in the exhaust valve body and comprises a floating ball and a sealing valve rod which is distributed in the vertical direction and can move up and down, the floating ball is fixed to the lower end of the sealing valve rod, a conical plug part is arranged on the sealing valve rod, and the conical plug part is used for blocking the automatic exhaust hole under the acting force of the floating ball when the water level in the exhaust valve body rises. According to the utility model, the exhaust effect can be obviously improved, the operation of the fire pump is more stable, and the working efficiency and the performance are greatly improved.

The present invention discloses a centrifugal pump structure with a self-priming valve, which aims to solve the problem that the outlet direction of the water flow during the operation of the centrifugal pump self-priming valve is set irrationally, thereby affecting the performance of the water pump. The invention includes a pump body, wherein a water inlet chamber and an impeller chamber are provided in the pump body, an impeller is installed in the impeller chamber, and the impeller is provided with a water inlet connected to the water inlet chamber. A reflux chamber is provided in the pump body, and a reflux channel is provided between the reflux chamber and the water inlet chamber. An integrated self-priming valve assembly is installed at the reflux channel, and the outlet of the reflux channel is set biased towards the water inlet. The self-priming valve on the centrifugal pump of the present application forms an integrated module, which is convenient for assembly with the centrifugal pump and can be adapted to different models of water pumps; the outlet of the self-priming valve is biased towards the water inlet direction of the impeller, thereby avoiding the obstruction of the water flow of the centrifugal pump by self-priming reflux, thereby ensuring the performance of the water pump.

The utility model relates to the field of water pumps, in particular to a water diversion device and a fire pump, the water diversion device comprises a water diversion pump body and a conduction device, the conduction device comprises a driving wheel, a driven wheel, a tensioning wheel, a tensioning belt used in cooperation with the driving wheel, the driven wheel and the tensioning wheel and a driving assembly, and the driving assembly is rotationally connected to the water diversion pump body; the tensioning wheel is rotationally connected to the driving assembly, the driving wheel is coaxially connected to a driving shaft of the speed reducer, the driven wheel is coaxially connected to a pump shaft of the primer pump body, the tensioning belt is connected with the driving wheel and the driven wheel, and when the driving assembly rotates and drives the tensioning wheel to be away from the driving wheel, the tensioning wheel is connected with the driving wheel, the driven wheel and the tensioning wheel in a tensioning mode. Through the arrangement of the driving wheel, the driven wheel, the tensioning wheel, the tensioning belt and the driving assembly, directional starting of the primer pump body is achieved, workers do not need to manually drive the primer pump body to operate all the time, the operation difficulty of the workers is lowered, the starting period of the fire pump is shortened, and therefore the using simplicity and convenience of the fire pump are improved.

The invention relates to the technical field of self-priming pumps, in particular to a self-priming pump and a control method thereof.The self-priming pump comprises a pump body, a liquid storage cavity is formed in the pump body; the controller is arranged on the pump body; the liquid level sensing assembly is arranged in the liquid storage cavity and connected with the controller, and the liquid level sensing assembly is used for detecting the real-time liquid level height in the liquid storage cavity, generating a signal and transmitting the signal to the controller; the air exhaust assembly comprises a vacuum pump and a channel which are arranged on the outer side of the liquid storage cavity, and the vacuum pump is connected with the controller; one end of the channel is communicated with the liquid storage cavity, and the other end is connected with the vacuum pump; after the power supply is switched on, if the liquid level height in the liquid storage cavity is lower than a first preset height, the liquid level sensing assembly generates a first signal and transmits the first signal to the controller, and the controller controls the vacuum pump to start working. The vacuum pump is adopted for pumping air, and the self-suction speed is greatly increased.

The utility model discloses a condensed water delivery device for an underground condensed water tank, which relates to the technical field of condensed water delivery equipment and comprises a condensed water delivery buffer tank, a cooling coil is arranged at the bottom in the condensed water delivery buffer tank, and the bottom of the condensed water delivery buffer tank is communicated with a water inlet of a delivery pump through a connecting pipeline; the outer wall of the condensed water delivery buffer tank is communicated with a condensed water tank through a right-angle bent pipe; a water filling opening pipe is arranged at the top of the condensed water delivery buffer tank and is communicated with an outlet pipe, and the outlet pipe is arranged on a water outlet of the delivery pump. According to the utility model, the condensed water delivery buffer tank provided with the cooling coil pipe is additionally arranged at the inlet of the delivery pump and is used for cooling the delivered condensed water and providing sufficient condensed water for the inlet of the delivery pump, so that the pumping-out and cavitation phenomena of the delivery pump are avoided, and the service life of the delivery pump is effectively protected.