113results about How to "Improve self-priming performance" patented technology

The invention discloses a liquid supply vehicle, which comprises a frame with a cab. The lower part of the frame is provided with wheels, the rear upper part of the frame is provided with a bedplate, a power driving device is arranged on the bedplate, a centrifugal pump is arranged below the bedplate, the power driving device is in transmission connection with the centrifugal pump, and an inlet and an outlet of the centrifugal pump are connected with a suction pipe and a discharge pipe respectively. The liquid supply vehicle has the advantages of improving the self-sucking effect of a fracturing truck, improving the operation efficiency of the fracturing truck and shortening the operation time, along with reasonable design, simple structure, easy assembly and manufacture, and also can be used for liquid delivery in other industries of flood drainage, sewage clearing and the like.

The invention discloses a balanced type double-row large-displacement axial plunger pump which comprises a swash plate, a cylinder body, a plunger pair, a valve plate, rotating plates and a driving shaft. The cylinder body is provided with two rows of concentric-circle cross-distributed holes, kidney-shaped holes of the holes incline towards the driving shaft, the kidney-shaped holes and the driving shaft cross by a certain angle to form a centrifugal oil shedding structure, and the self-suction capacity of the pump and the pump revolution speed allowable value are improved; the swash plate comprises two slopes which cross to for an X shape, the cross line passes through the center of a spline of the driving shaft, capsizing moment of reactive force of the swash plate on the cylinder body is reduced, the suspension length of the plungers is reduced, the stress condition of the cylinder body and the plungers is improved, and improvement of pressure rating of the pump is facilitated. The rotating plates are arranged on the two slopes, and abrasion of piston shoes and the swash plate is reduced.

An intelligent pump set of waste water treatment plant in new type is prepared as using relevant software to control said pump set, setting pump body to be U form for avoiding siphon, setting rotary stop pressurizing ring for preventing water from rotation to decrease flow rate of media for making gas-liquid be separated sufficiently, setting return unit between pollution discharge port connected through to pump liquid storage chamber and outlet connected through to pump gas-liquid separation chamber to return water back to said liquid storage chamber for raising self suction effect.

The invention relates to an oblique plunger type pure water hydraulic swash plate pump, which adopts a sphere flow distribution structure of a cone-shaped cylinder. A plunger and a transmission shaft form an included angle, and relative to the transmission main shaft, the plunger is arranged in a shape of cone; and centripetal force generated during operation facilitates return stroke of the plunger. The main shaft is connected with a conical cylinder via a spline, and the plunger is matched with skid shoes via a ball head. A spherical hinge and the cone-shaped cylinder are pressed by a disk spring, return stroke force during the operation of the plunger is provided and sealing of the skid shoe pair and the flow distribution pair is achieved. A flow distribution disc adopts a sphere flow distribution structure, facilitates balancing of subversion moment generated by the cone-shaped cylinder during operation, and improves the self-alignment performance of the cone-shaped cylinder and the flow distribution plate; the cone-shaped cylinder and the sphere flow distribution disc structure enable the flow distribution window pitch diameter of the flow distribution disc to be reduced, water absorption flow rate is reduced, and self-sucking performance of a pump is enhanced. The pump takes filtered fresh water or seawater as the working medium, solves the problems that the self-sucking performance of a pure water hydraulic plunger pump is poor and the return stroke is difficult, and has remarkable technical advantages.

The invention relates to a multifunctional sludge, sewage and dirt treatment machine of a septic tank. The sludge, sewage and dirt treatment machine comprises a pumping system, a dispensing system group, a solid-liquid separation system, a base I, a plurality of connecting pipelines and a plurality of valves. The multifunctional sludge and sewage treatment machine integrates the dirt collection, crushing, slag removal, filtering, dehydration and packaging, can automatically classify and treat any domestic sewage and dirt, sludge and sewage of the septic tank into slag, clean water and recyclable organic manure raw materials (sludge), and is a movable environment-friendly and ecological treatment factory capable of intensively treating various domestic sewage, excrement dirt, sludge and sewage rather than a simple excrement pumping truck and a dirt suction truck.

This invention comprises front pump cover 11, rear pump cover 1, pump 3, cylinder 4, porting device 2, plunger 6 whose one end hinges the sliding boot 8, the other end is in the plunger cavity 30, swash plate 10 whose incidence can be or not be adjusted, static supporting 20 between the swash plate 10 and the sliding boot 8, hold-down spring 15, drive axle bearing and seal assembly 12, and drive axle 13; wherein the plunger 6 has inner cavity 19, a blind hole cavity with accumulator 5; between the sliding boot 8 and the swash plate 10 is a supporting plate 9 which can be rotated. Said invention can absorb the pulsing flow and hydrodynamic shock effectively, and it is especially fit for hydraulic driving pump and motor.

The invention relates to a cam preparation method and a cam type four-cylinder single-action reciprocating pump. The cam preparation method comprises the following steps of: determining an upper contour line of contour radius vectors from R1 to R5 corresponding to the cam which rotates between 0 and Pi, wherein a lower contour line is symmetric with the upper contour line; copying the upper contour line to be a whole contour line of the cam; and lofting and forming. The cam type four-cylinder single-action reciprocating pump consists of four single-action cylinders, pistons of the single-action cylinders, piston rods connected with the pistons, intermediate rods connected with the piston rods, a transmission shaft, the cam arranged on the transmission shaft, a resetting framework arranged outside the cam, a guide framework arranged outside the resetting framework, bearings for enabling the transmission shaft to be fixed on the guide framework and a motor connected with the transmission shaft, wherein the cam comprises a cam I and a cam II which are prepared by the preparation method and have the same shape; and the cam I and the cam II are arranged on the transmission shaft in a manner of forming a 90-degree phase difference. According to the cam type four-cylinder single-action reciprocating pump, the reciprocating pump can output fluid constantly without any fluctuation, and the self-suction performance is high.

The invention discloses a handheld flushing pump, mainly comprising a pump body, a piston, an eccentric shaft, a motor, an input check valve and a drainage check valve, wherein the eccentric section of the eccentric shaft is inserted into a groove at the waist part of the piston, and when the motor drives the eccentric shaft to rotate, the piston moves to and fro so as to suck and drain off water. The pump body and the eccentric shaft are both directly mounted on the micro motor, so that handheld flushing pump is compact in structure, light in weight, small in size and convenient to move, and can be used at all sites with civil electricity; according to the character of pumps, the handheld flushing pump belongs to displacement pumps, has higher self-suction capacity, can perform flushing by only inserting a suction pipe into a water bucket, does not need to stop working even water in the water bucket is used up, and still can suck water for flushing by filling water into the water bucket, thus providing the capability of self-restoring after running out of water; furthermore, the pump has very high efficiency which generally can reach more than 70%. The handheld flushing pump has the advantages of compact structure, light weight, convenience to move, strong self-suction capacity, self-restoring after running out of water, and utilization of civil electricity.

The invention discloses a vertical internal and external mixing shaft-seal-free self-sucking pump which comprises a pump body, a pump cover, a pump shaft, a main impellor, a main impellor seal chamber, an assistant impellor chamber, an assistant impellor, a water sucking chamber, a water outlet, a water inlet pipe, a water inlet pipe flange, a volute chamber and a gas-water separation chamber, wherein the top surface of the main impellor and the top surface of the assistant impellor are respectively provided with a radial main impellor balancing rib and a radial assistant impellor balancing rib; the outer edge at the bottom surface of the assistant impellor is fixedly provided with an annular seal pad; and the bottom surface of the assistant impellor chamber is provided with an annular supporting plate. Through the self-sucking pump provided by the invention, the issue of air intake of a shaft seal can be solved, high-vacuum continuous air exhaust can be kept all the time in the self-sucking process, the self-sucking capability is improved, and the self-sucking time is shortened.

The invention relates to an oil-free rotary vane vacuum type self-priming centrifugal pump and a use method thereof. The oil-free rotary vane vacuum type self-priming centrifugal pump comprises a self-priming centrifugal pump body; a gas-liquid separation chamber, a liquid inlet pipe and a liquid discharging pipe are arranged on the self-priming centrifugal pump body; a first one-way valve is arranged on the liquid discharging pipe; a vacuum pump is integrated inside the gas-liquid separation chamber and integrated with the self-priming centrifugal pump body; the vacuum pump is an oil-free rotary vane vacuum pump and is provided with an inlet and an outlet; the inlet is communicated with the liquid inlet pipe through a suction pipeline; the outlet is communicated with the first one-way valve through an exhaust pipeline; a second one-way valve is arranged on the suction pipeline; the exhaust pipeline is provided with a third one-way valve and an electromagnetic valve; the third one-way valve is close to the first one-way valve; a liquid level switch is arranged on the liquid inlet pipe; the height of the liquid level switch on the liquid inlet pipe is lower than that of the suction pipeline; the liquid level switch is electrically connected with the vacuum pump and the electromagnetic valve. The pipeline system is simplified, the self-priming performance of the pump is improved, and the oil-free rotary vane vacuum type self-priming centrifugal pump has the advantages of being compact in structure, high in efficiency, long in service life and the like.

The invention discloses a hydraulic control system for an ocean engineering crane and belongs to the technical field of ocean engineering cranes. A main motor is connected with a main pump package; the oil outlet of the main pump package is communicated with the oil inlet of a reversing valve bank; the first oil outlet and the second oil outlet of the reversing valve bank are respectively communicated with two oil ports of a hydraulic motor through a balance valve bank; the oil return port of the reversing valve bank is communicated with the oil inlet of the main pump package; the hydraulic control system also comprises an oil supplement motor, an oil supplement pump and a hydraulic oil tank; the oil supplement motor is connected with the oil supplement pump; the oil inlet of the oil supplement pump is communicated with the oil outlet of the hydraulic oil tank; the oil outlet of the oil supplement pump is communicated with the oil inlet of the main pump package; the oil return port of the hydraulic oil tank is communicated with the oil return port of the reversing valve bank and the communicated pipeline is provided with a first one-way valve. The oil supplement motor is connected with the oil supplement pump, the oil supplement pump can sufficiently supplement hydraulic oil, and when the hydraulic pipeline is filled with the hydraulic oil, the first one-way valve can generate certain back pressure, the suction capacity of the main pump package is improved and the main pump package is prevented from sucking air and vibrating.

The invention discloses a two-screw pump and a preparation method of rubber lined screw rods of the two-screw pump. The two-screw pump comprises a pump body, a pump front cover, a pump rear cover, a driving screw rod and a driven screw rod, wherein the driving screw rod and the driven screw rod are arranged in the pump body and meshed with each other; the pump body adopts such a transmission manner that liquid inlets are formed in two ends of the pump body and a liquid outlet is formed in the middle of the pump body; the surface of the driving screw rod as well as that of the driven screw rod is lined with a layer of rubber. The preparation method comprises the following steps: conducting de-oiling and sand-blast treatment on the outer surfaces of the screw rods; coating the outer surfaces of the screw rods with a layer of an adhesive after cleaning and drying; placing the screw rods coated with the adhesive into a screw rod mold for rubber injection; performing vulcanization molding in a large-scale rubber vulcanization tank; opening the screw rod mold after cooling, so that the required rubber lined screw rods are obtained. The surfaces of the driving screw rod and the driven screw rod are lined with the layers of rubber in such a manner of local rubber injection and local air discharge, so that the preparation method is simple and easy to operate, the rubber injection difficulty is reduced, and the quality of a rubber body is also guaranteed; the two-screw pump is resistant to abrasion, high in sealing performance and long in service life, and the medium through capability can be effectively improved.

The invention provides a double-outlet multipurpose external mixing type self-priming pump with a quasi-spiral suction chamber. The double-outlet multipurpose external mixing type self-priming pump mainly comprises an inlet flange, a pump body, an impeller, an air-liquid separating pipe, a rear cover, a suspension body part, an outlet flange and a flange cover, wherein the pump body is formed by the quasi-spiral suction chamber, a spiral compression chamber and a liquid storage chamber through integral casting and is provided with double outlets and the like. The hydraulic performance of the pump is effectively improved while the self-priming performance of the self-priming pump is improved, the flow losses of fluid media in a suction chamber and a water compressing chamber are remarkablyreduced, and the double-outlet multipurpose external mixing type self-priming pump has the advantages of being high in efficiency and reliability, compact in structure, convenient to install and maintain and multipurpose, serving as a pipeline self-priming pump accessed horizontally only by slightly adjusting an installing mode and the like, is suitable for the fields of agricultural irrigation and drainage, river and pond breeding, municipal drainage, petrochemical metallurgy and the like and can be installed on a movable pump truck for fire-fighting operation and the like.

The inveniton provides a fluid pressure supply device of transmission, which comprises a first and a second fluid pressure pumps respectively driven by the first and the second driving powers, and can improve the self-absorption of working fluid of the second fluid pressure pump. The device comprises a liquid pressure pump (46c) which is driven by an engine carried on the vehicle for discharging the liquid pressure to an oil way (46e) connected to the belt wheel of CVT; a first and a second pressure regulating valve (46l, 46m) for inputting the discharged fluid pressure, and the pressure is outputted from the channle formed by ring groove etched on the valve column for supplying to the belt wheel, moreover, the leakage part of the inputted liquid pressure is discharged from a second output port (46l6, 46m6); an electric hydraulic pump (46mm) driven by an electric motor (74) for discharging the liquid pressure, moreover, the second output port (46l6, 46m6) of the first and the second pressure regulating valve are connected to a suction inlet (46mm1) of the electric hydraulic pump through oil way (46vv, 46ww, 46xx).

The invention provides a floating ball self-sucking valve with a lever structure and a design method of the floating ball self-sucking valve with the lever structure. The self-sucking valve comprises a valve body and a hollow floating ball. The self-sucking valve is characterized in that an air outlet perpendicular to the valve body is formed in the valve body, and the upper portion of the air outlet is open and is provided with a valve port cover; the hollow floating ball is connected with one end of an ejector rod through a floating ball fastening nut, the ejector rod penetrates through an ejector rod movable tube fixed to the valve body, the other end of the ejector rod is connected with a valve rod through a lever arranged on the side wall of a valve body cover, and a sealing rubber ring is fixed to the valve rod and located at the position of a valve hole of the valve port cover. According to the floating ball self-sucking valve with the lever structure, the acting force exerted when the floating ball self-sucking valve is closed is large, the reliability of the sealing performance of the valve is improved, the amount of leaked liquid, entering a displacement pump, of the self-sucking valve at the position of an inlet of the self-sucking pump is reduced, the operating efficiency and the reliability of the suction displacement pump are improved, and the pumping efficiency and the cavitation performance are improved.

The invention discloses a water purifying device for a fish tank. The water purifying device comprises a box body. A first supporting plate is fixedly connected with the portion, between the two opposite sides, of the top of the inner wall of the box body. One side of the top of the first supporting plate is fixedly connected with a first self-suction pump. A water inlet end of the first self-suction pump is communicated with a water suction pipe. The side, close to the first self-suction pump, of the top of the first supporting plate is fixedly connected with an impurity removal box. A secondsupporting plate is fixedly connected with the portion, between the two opposite sides and below the first supporting plate, of the inner wall of the box body. A water purifying box is slidingly connected with the top of the second supporting plate. A second slide rail and a third slide rail are fixedly connected with the two opposite sides of the inner wall of the box body sequentially from topto bottom. The top of the second slide rail is slidingly connected with a first filter element. The top of the third slide rail is slidingly connected with a second filter element. A second self-suction pump is fixedly connected with the bottom of the inner wall of the box body. The invention relates to the technical field of water purification. By means of the water purifying device, the problemthat water in the fish tank needs to be changed frequently is solved, and the ornamental value and the health of fishes are ensured.

The invention belongs to the technical field of low-pressure fuel pumps of an aviation engine fuel system, and relates to a fuel inlet device for improving the self-suction capacity of a centrifugal pump. The device comprises an integrated induction impeller (1), a pump cover (2) and an injection pipe (3), and a formed internal structure comprises a mixing section (4), a nozzle (5), a throat pipe(6), an oil return pipe (7), a diffusion section (8) and an oil return port (9). According to the device, the pump cover of the centrifugal pump is skillfully utilized, the oil return port and the oilreturn pipe are arranged to introduce high-pressure oil at an outlet back to an inlet, and the jet flow is formed through the nozzle, so that the energy at the inlet is increased and the cavitation resistance is improved while the self-suction capacity of the inlet is improved; and the device is simple in structure and easy to realize, and the weight and the space are saved.

The invention discloses an efficient imbibition and drag-reducing water system applicable to an atmospheric pressure shale gas reservoir. The efficient imbibition and drag-reducing water system applicable to the atmospheric pressure shale gas reservoir comprises the following components: 0.04-0.1 percent of a high-molecular polymer drag reducer, 0.05-0.2 percent of a moisture regulator, 0.1-0.3 percent of an efficient shale inhibitor, 0.01-0.03 percent of an environment-friendly fungicide, 0.05-0.1 percent of an imbibition conditioner and the balance of water. The efficient imbibition and drag-reducing water system applicable to the atmospheric pressure shale gas reservoir has the advantages that the efficient imbibition and drag-reducing water system is prepared by using a low molecular weight high-molecular polymer as a drag reducer and introducing the moisture regulator, the imbibition conditioner, the efficient shale inhibitor and the environment-friendly fungicide. Therefore, therock core spontaneous imbibition amount can be effectively increased, the imbibition of a fracturing fluid to a deep ground mass can be promoted; smoothness of a spontaneous imbibition passage can bekept; the desorption of adsorbed gas can be promoted; effects of water soluble replacement of the adsorbed gas, energy increasing and drainage are achieved; atmospheric pressure shale fracking construction requirements are satisfied; the drainage of atmospheric pressure shale gas drag-reducing water fracturing fluid flow-back fluid is reduced; and the development of economic benefits of an atmospheric pressure shale gas field is realized.

The invention relates to the technical field of microwave devices, in particular to a seal ring for a cabinet type microwave device door, the seal ring is a two-layer structure comprising a base layer and a surface layer, the base layer of the seal ring comprises the following components by weight percent: 95%-99% of silicone rubber and 1%-5% of modified auxiliary, the surface layer of the seal ring comprises the following components by weight percent: 30%-34% of silicon rubber, 0.5%-1% of modified auxiliary, 64%-68% of composite magnetic material and 0.1%-0.5% vulcanizing agent. Compared with the prior art, the cabinet type microwave device door can be closed by self-absorption, the switch is free and easy, and the structure is novel and simple, has self-absorption force and can effectively ensure the sealing property of the microwave device door, enhance the safety of the use, lead the use to be very portable and achieve the purpose of easy switching, thereby realizing good sealing property and being firm and durable.

The invention provides a temperature-resistant and salt-resistant fracturing fluid imbibition agent, and a preparation method and application thereof, and belongs to the technical field of oil exploitation, transportation and chemical engineering. The target product is obtained by taking Br(CH2)mCOOC2H5, N-methylimidazole, R1(Me)SiHO[(Me)2SiO]nR2 as reaction raw materials and enabling a reaction to be carried out stably under the cooperation of a preferred process. The temperature-resistant and salt-resistant fracturing fluid imbibition agent provided by the invention can show good imbibitionperformance in an environment with a mineralization degree of 19334 mg / L (wherein the total amount of calcium ions and magnesium ions is 514 mg / L) and a high temperature of 150 DEG C.

The invention discloses a hydraulic self-adaptive control system for an anti-falling device and a control method of the hydraulic self-adaptive control system. The hydraulic self-adaptive control system is not provided with a driving motor, cannot actively drive an external load to operate, only passively adapts to the change of the load, and utilizes the gravitational potential energy of separating from part of the load; the pressure energy and the kinetic energy are converted into pressure energy and kinetic energy of the hydraulic self-adaptive system. Therefore, the motion speed of the separated part load is controllable, and accelerated falling of the separated part load is prevented. Meanwhile, the hydraulic self-adaptive control system is high in load resistance and can adapt to changes of different loads in a large range, it is guaranteed that the pressure of the hydraulic system changes along with load force in a self-adaptive mode in the working range of equipment, and it is guaranteed that the anti-falling device controls the separated part of the loads to fall at the same set speed all the time.

The invention discloses a high-efficiency energy-saving self-priming centrifugal hydraulic system, and relates to the technical field of water pumps. The high-efficiency energy-saving self-priming centrifugal hydraulic system is characterized in that the high-efficiency energy-saving self-priming centrifugal hydraulic system comprises a pump body, the pump body is provided with a centrifugal impeller, a water inlet channel, a centrifugal cavity and a water outlet channel, the pump body is provided with an ejector, an energy storage bin, a communication channel and a self-adaptive regulating valve, the self-adaptive regulating valve comprises an outer shell and a self-adaptive floating ball body, the outer shell is provided with a streaming cavity, a water inlet and a water outlet, the streaming cavity comprises a guide section, the water inlet channel is provided with a narrow opening section, the energy storage bin is provided with a water supplementing inlet, the inner wall of the water inlet channel is provided with a stepped annular groove, the end of the centrifugal impeller is provided with a protrusion, the inner wall of the water outlet channel is provided with a backflow cavity, and the inner wall of the backflow cavity is provided with an elastic arc plate. By arranging the ejector and the self-adaptive regulating valve, so that the energy loss of the pump body is reduced, the energy utilization rate of the pump body is increased, and the pump body is more efficient and energy-saving; by arranging the narrow opening section, the self-priming capacity of the pump body is improved; and by arranging the elastic arc plate, the energy utilization rate of the pump body is further increased.

The invention relates to an integrated low-pulsation seawater desalination energy recovery and pressurization device. A structure type of a rotary pressure exchanger and a swash plate plunger type booster pump is adopted; the low-pressure area of a fresh seawater valve plate has an open design; a pressure exchanger cylinder hole directly sucks water from a cavity of a device shell during operation, so that the suction performance is improved; the inlet of the booster pump is equipped with high-pressure water, so that the self-suction performance is improved; the flow pulsation of a high-pressure seawater outlet is reduced through water suction and drainage of a plurality of plungers, the flow quality of an energy recovery supercharging device is improved, the impact of the outlet flow pulsation of the device outlet on a reverse osmosis membrane is reduced, and the service life of the reverse osmosis membrane is improved. The device provided by the invention overcomes the defects of lowintegration degree, large flow pulsation, large volume weight and the like of a rotary energy recovery device in the prior reverse osmosis seawater desalination system, and has the obvious technicaladvantages of high energy recovery rate, high flow quality, high integration degree, small structure size and the like.

The invention discloses a centrifugal water pump. A pump shell of the centrifugal water pump is divided into a front section and a rear section, wherein the front section and the rear section are connected with each other, the front section is provided with a pump volute and the rear section is provided with a segmented pump shell. An eccentric rotor with fixed blades is installed in the pump volute. A semi-open type tangent impeller is installed in the segmental pump shell, and blades of the semi-open type tangent impeller are in a radial structure at the rotation center. The centrifugal water pump has a low flow rate, high pressure and high self-suction capability of a plunger pump, overcomes the defects of an existing centrifugal pump as a high-pressure cleaning pump, fundamentally overcomes the defects of the plunger pump in operation, enables the structure of the centrifugal water pump to be simpler and enables the operation to be more stable, can effectively save the use energy consumption, and improves the efficiency and the application stability, so that the centrifugal water pump can be well applied to high-pressure cleaning equipment.

The invention discloses an overflow no-damage multiphase mixed transmission pump. The pump comprises a suction pipe, an interception net, a conical shrinkage nozzle, a gas mass and flow controller, acontroller, a pump body, an impeller, a pump cover, a pump shaft, a mechanical seal, a sleeve, a suspension, a bearing, an end cover, front impeller rings, a rear impeller ring and a bottom valve, wherein a front cover plate and a rear cover plate of the impeller are connected through a connecting rod, the front cover plate and the rear cover plate are provided with six long radial blades and sixshort radial blades which are evenly distributed along the axis line of the pump shaft, the middle of an impeller flow passage is a bladeless area, the impeller is connected with the pump shaft through a key and is positioned in the pump body, the conical shrinkage nozzle is installed at the front end of the suction pipe through the axis line of the pump shaft, the suction pipe is connected with an inlet of the pump body, and a volute of the pump body is an annular volute. The pump has the advantage of no damage, no blockage, good self-absorption performance, stable operation, strong cavitation resistance and the like, and can be applied to the multiphase transportation fields such as live fishes, live shrimps and foods like sauce, edible oil and jelly.

The invention relates to a guide vane for improving self-priming performance of a jet-type centrifugal pump. The method is characterized in that baffle plates with the same number of guide vane outlets are added on the back surface of a prototypical guide vane, wherein the axial dimension of the baffle plates is larger than or equal to the distance from the back surfaces of the guide vane outlets to the farthest position of a pump cavity outlet; the radial dimension of the baffle plates is flush with the upper edges of the guide vane outlets; the thickness of the baffle plates can be the same as the thickness of radial reinforcing ribs; the baffle plate number N1 is equal to the guide vane outlet number N3; and included angles of the baffle plates and the radial reinforcing ribs refer to the description. Through the adoption of the guide vane of the form, outflow from the circumferential direction of the guide vane outlets can be effectively blocked, gases and liquids in a pump cavity are fully separated, and the purpose that the self-priming performance of the jet-type centrifugal pump is achieved under the situation that the volume of the pump cavity is relatively small or an outlet of the pump cavity is relatively close to the guide vane.

The invention discloses a method for improving the performance of a high-speed and heavy-load plunger pump and a novel tapered cylinder device. The method includes the following steps: forming the angle alpha between an axial line of a spindle of a cylinder body and an axial line of a plunger, and forming the angle beta between a center line of each oil suction / drainage hole in the cylinder body and an axial line of the spindle, so as to improve the working rotating speed and displacement of the plunger pump. The novel tapered cylinder device includes a cylinder body (1) and a spindle hole (6) horizontally arranged at the center of the cylinder body (1), wherein a plurality of inclined plunger holes (3) are uniformly distributed on the periphery of the spindle hole (6); an inclined oil suction / drainage hole is communicated with one end of each plunger hole (3), and a copper bush (2) is arranged at the other end of each plunger hole (3). According to the invention, under the premise that the volume and weight of the high-speed and heavy-load plunger pump are basically unchanged, the displacement, rotating speed and working reliability are greatly improved, besides, noise reduction is realized, the copper bushes are prevented from falling off, and the service life of the high-speed and heavy-load plunger pump is improved.

A centrifugal pump includes an impeller rotatably disposed in a volute case for forcing a fluid to flow along a volute internal flow channel formed in the volute case, and first to fourth flow-channel recessed portions opening to the volute internal flow channel. The first and fourth flow-channel recessed portions are formed so as to be recessed in a direction substantially orthogonal to a direction of flow of the fluid. In a self-priming operation, the fluid is introduced into the first and fourth recessed portions whereupon the prime fluid is stirred within internal spaces of the first and second flow-channel recessed portions.

The invention relates to a low-noise two-way servo pump source which comprises an oil tank, a pump source assembly, a valve control set, a hydraulic cylinder, a cooler and an oil return filter. The pump source assembly comprises a double-shaft-extension servo motor, a first hydraulic pump, a second hydraulic pump, a first clutch and a second clutch. The valve control sets comprise the first valve control set and the second valve control set, the hydraulic cylinder comprises a cylinder body and a piston, and the piston is slidably connected to an inner cavity of the cylinder body and divides the inner cavity of the cylinder body into a first cavity and a second cavity. Reciprocating motion of the hydraulic cylinder is achieved through forward rotation and reverse rotation alternate motion of the double-shaft-extension servo motor, the reciprocating motion speed of the hydraulic cylinder is achieved by adjusting the rotating speed of the double-shaft-extension servo motor, and therefore bidirectional speed regulation and direction control of the whole hydraulic transmission system are achieved. The device is simple in structure, low in noise, high in reliability and wide in speed regulation range.