49results about How to "Improve volumetric efficiency" patented technology

The invention discloses a double-screw compressor rotor profile and a double-screw compressor, and belongs to the technical field of compressors, the rotor profile comprises a male rotor tooth curve and a female rotor tooth curve, the male rotor tooth curve comprises an A1B1 section, a B1C1 section, a C1D1 section, a D1E1 section, an E1F1 section, an F1G1 section, a G1H1 section and an H1I1 section which are sequentially and smoothly connected; the tooth curve of the female rotor comprises an A2B2 section, a B2C2 section, a C2D2 section, a D2E2 section, an E2F2 section, an F2G2 section, a G2H2 section and an H2I2 section which are sequentially and smoothly connected. The tooth curve of the male rotor is obtained by converting the rack line from a rack coordinate system to a tooth profile coordinate system of the male rotor; and the female rotor tooth curve is obtained by converting the rack line from the rack coordinate system to the tooth profile coordinate system of the female rotor. By means of the sectional tooth curve, the large calculation amount caused by directly optimizing the female rotor profile and the male rotor profile can be avoided, and therefore the design efficiency of the rotor profiles is improved.

The invention discloses a pump body assembly, a compressor and air conditioning equipment, and relates to the technical field of compressors, the pump body assembly comprises a first-stage cylinder body, the first-stage cylinder body is provided with a first-stage compression cavity, a first exhaust hole and a second exhaust hole, and the first exhaust hole and the second exhaust hole are formed in the cavity wall of the first-stage compression cavity in a spaced mode and communicate with the first-stage compression cavity; the cavity wall of the first-stage compression cavity is further provided with a first guide notch communicated with the edge of the first exhaust hole and a second guide notch communicated with the edge of the second exhaust hole, and the ratio of parameters (R1, D1, theta1 and L1) related to the first exhaust hole to parameters (R2, D2, theta2 and L2) related to the second exhaust hole is defined to be larger than or equal to 0.28 and smaller than or equal to 3.6, wherein (R1 * D12 * theta1 * L1) / (R2 * D22 * theta2 * L2). The two exhaust ports are optimized independently, it is guaranteed that the two exhaust back pressures in measurement are basically equal, synchronous exhaust is achieved, and therefore the performance of the compressor is improved.

The present invention discloses a two-stage compression vane vacuum pump with an asymmetric cylinder profile. The vacuum pump comprises a front cover (1), a rotor (2), a cylinder (3), a vane (4) and a rear cover (5). The contour profile of the cylinder (3) consists of five different curves, and the first-order derivative and the second-order derivative are continuous. During operation, two cavities with different volumes and asymmetry are formed between the front cover (1), the cylinder (3), the rear cover (5) and the rotor (2). The gas completes a primary compression process in the primary cavity (301) and then enters the secondary cavity (302) for secondary compression, thereby realizing two-stage compression. The front cover (1) is provided with a first air intake port (101) and a second air exhaust port (102), and the rear cover (5) is provided with a first air exhaust port (502) and a second air intake port (501). The disclosed vacuum pump not only has a larger internal volume ratio and improves the vacuum degree, but also reduces its power consumption and the clearance volume.

The invention discloses a low-leakage Roots rotor profile with a larger shape coefficient, which is composed of half-leaf profiles symmetrically adjacent to the pitch circle of twice the number of blades, wherein the half-leaf profile is sequentially composed of four parts, namely, a peak concentric arc outside the pitch circle, a peak conjugate profile, a valley transition curve inside the pitch circle, and a valley concentric arc, which are connected end to end, and the corresponding endpoints and connection points are sequentially a peak point, a vertex, a midpoint, a root point located on the peak symmetry axis, and a valley point located on the valley symmetry axis. The invention has a larger shape coefficient and volume utilization coefficient; has a smaller radial leakage rate and a conjugate leakage rate, and thus has a higher volumetric efficiency and a better lightweight effect.

The utility model discloses a diaphragm adjusting device of a diaphragm compressor under low-negative-pressure air inlet. The diaphragm adjusting device comprises a piston assembly, a crosshead assembly, an air distribution disc and an oil distribution disc. The three metal diaphragms are arranged between the gas side diaphragm cavity and the oil side diaphragm cavity in an overlapped mode, and the middle diaphragm is provided with a guide groove to be communicated with the leakage detection opening; the electromagnet is arranged on the surface layer, close to the diaphragm side, of the oil distribution disc; the piezoelectric ceramics are respectively fixed in the machine body assembly and are close to an upper dead center and a lower dead center of the crosshead assembly; the springs are fixed on the two sides of the machine body assembly, are insulated from the crosshead assembly and are used for triggering the piezoelectric ceramics; the electromagnets are electrically connected with the piezoelectric ceramics respectively; the switch is attracted and controlled by the electromagnet to switch on and off of a circuit; the slide rheostat is connected in series with the electromagnet to adjust the adsorption force; the spring impacts the piezoelectric ceramic when the crosshead assembly moves to the upper stop point and the lower stop point, current is excited to enable the electromagnet to attract the switch, and then power-on and power-off of the electromagnet are controlled.

The invention provides a crankshaft and a compressor, the crankshaft comprises a long shaft part, an eccentric part and a short shaft part, and an oil absorption channel extends from the long shaft part to the short shaft part; the eccentric part is provided with an oil outlet hole communicated with the oil suction channel, the eccentric part is provided with a first expansion channel passing through the oil outlet hole, the first extension direction of the first expansion channel is parallel to a rotating shaft of the crankshaft, a second expansion channel is arranged in the circumferential direction of the eccentric part, and the second extension direction of the second expansion channel is perpendicular to the first extension direction of the first expansion channel. The oil supply structure of the eccentric part of the crankshaft can be optimized, double insurance of sealing and lubricating is achieved, the volume efficiency is improved, the friction power consumption of the crankshaft is reduced, the overall power consumption is reduced, and the energy efficiency of the compressor is improved.

The invention provides an air supplementing and enthalpy increasing assembly, a pump body assembly, a compressor and refrigeration equipment, the air supplementing and enthalpy increasing assembly comprises a base, a first sliding block, a second sliding block, a first elastic reset piece and a second elastic reset piece, a first sliding groove and a second sliding groove are formed in the base, and a first compression cavity communicating port and a first air supplementing communicating port are formed in the groove wall of the first sliding groove; a second compression cavity communication port and a second air supply communication port are formed in the wall of the second sliding groove, in the first state, the first sliding block is located at the first disconnection position, the first compression cavity communication port and the first air supply communication port are not communicated, the second sliding block is located at the second communication position, and the second compression cavity communication port and the second air supply communication port are communicated; and in the second state, the first sliding block is located at the first communicating position, the first compression cavity communicating opening communicates with the first air supply communicating opening, the second sliding block is located at the second disconnecting position, and the second compression cavity communicating opening does not communicate with the second air supply communicating opening. The air supply enthalpy increasing assembly can control the low-pressure cavity to be connected with the air supply channel, so that injection air supply to the compression cavity with small pressure is achieved, and air backflow can be effectively prevented.

The utility model provides a two-degree-of-freedom efficient piston pump, and belongs to the field of piston pumps. The piston pump solves the problem that the efficiency and the stability of a traditional piston pump can be limited when high-flow, high-pressure or special-flow-state fluid conveying is needed in some application scenes. The two-degree-of-freedom efficient piston pump comprises a cylinder body, a containing cavity is formed in the cylinder body, a piston seat used for transmitting power is arranged in the cylinder body, a first piston rod and a second piston rod which are used for transmitting power are arranged at the front end and the rear end of the piston seat respectively, and cams with a fixing function are arranged on the first piston rod and the second piston rod in a sleeving mode. The extending parts of the first piston rod and the second piston rod are respectively provided with a rolling wheel playing a rotating role, the rolling wheels are connected with the cam, and the second piston rod is provided with a coupler used for transmitting motion and torque. The utility model has the advantages that the volumetric efficiency of the pump is improved, and the mechanical efficiency of the pump is also improved.

The present application relates to the technical field of positive displacement fluid machinery, and particularly relates to a low-noise three-screw rod pump and a ship hydraulic system. The low-noise three-screw rod pump comprises a new active screw rod, a positioning sleeve, two new driven screw rods, and a smooth section. The positioning sleeve is provided on the smooth section of the new active screw rod in an interference fit. The positioning sleeve is provided with an annular limiting groove. The two new driven screw rods are symmetrically matched with the new active screw rod. The front end of the new driven screw rod is provided with a cylindrical guide section. The cylindrical guide section is rotatably embedded in the annular limiting groove. The circumferential surface of the cylindrical guide section is provided with a tapered oil guide surface. The tapered oil guide surface is clamped between the inner wall of the bushing and the annular limiting groove with a set radial gap. The low-noise three-screw rod pump and the ship hydraulic system solve the technical problems of vibration noise increase caused by the large axial installation gap and the radial thermal expansion and jamming.

This utility model discloses an oil-free twin-screw air compressor, relating to the field of air compressor technology. It includes an air compressor mounting housing, with a fixed housing installed at one end of both the air inlet and outlet. A connecting block is fixedly connected to one side of the outer wall of each fixed housing, and a motor is connected to the inner wall of the connecting block. A spur gear is connected to the output end of the motor. This utility model uses an adjustment mechanism to adjust the intake and exhaust port diameters in real time, precisely matching the air demand under different operating conditions. For example, at low loads, reducing the intake area can reduce ineffective compression and leakage losses, while at high loads, rapidly expanding the opening area can ensure sufficient air supply to the components, avoiding additional energy consumption due to insufficient pressure. This reduces energy waste associated with traditional fixed throttling or variable frequency speed control methods, ensuring the compressor always operates within its high-efficiency range.

The application provides a radial plunger hydraulic device and relates to the technical field of hydraulic transmission. The radial plunger hydraulic device comprises a flow distribution part connected with an eccentric main shaft, the flow distribution part comprises a first high-pressure flow distribution window, a first low-pressure flow distribution window, a second high-pressure flow distribution window, a second low-pressure flow distribution window, a high-pressure oil hole and a low-pressure oil hole; the flow distribution part is adapted to rotate with the eccentric main shaft and is configured to be capable of controlling the first high-pressure flow distribution window and the first low-pressure flow distribution window to be connected with the first control oil path in advance / delayed or controlling the second high-pressure flow distribution window and the second low-pressure flow distribution window to be connected with the second control oil path in advance / delayed, so that the hydraulic control one-way valve is closed when the two-way plug-in valve is opened or the hydraulic control one-way valve is opened when the two-way plug-in valve is closed. Through the scheme, the volumetric efficiency of the radial plunger hydraulic device can be improved and the impact and vibration can be relieved.

The invention discloses a low-pulsation low-noise axial plunger pump device which comprises a shell, an oil distribution cover, a main shaft arranged in the middle in the shell, a plurality of plungers distributed in a back-to-back staggered mode along the circumference of the main shaft, an oil distribution disc located in the shell and arranged at the end of the main shaft, a floating cylinder base located on the rear side of the oil distribution disc, a floating cylinder and a limiting sleeve. A pressing plate is arranged between the floating cylinder and the plunger; and a driving pin is arranged between the floating cylinder seat and the main shaft. The number of the plungers is 2-3 times that of a conventional pump, the plungers are back to back and staggered, hydraulic pressure internal force borne by the main shaft can be counteracted, work and operation are stable, the generated pulsation double amplitude is very low, and compared with a traditional plunger pump, the pump is few in leakage point and high in volume efficiency; high-quality flow can be output, and noise is low. The invention has the advantages of simple structure, small occupied space, light weight, lower pressure pulsation and low noise.

The invention relates to a Roots rotor profile with higher volumetric efficiency and inner straight conjugation, comprising 4, 6, and 8 half-lobe profiles circumferentially symmetrically adjacent to each other under 2, 3, and 4 blades. The half-lobe profile is composed of six parts, namely, a peak concentric arc outside the pitch circle, a peak transition curve, a peak conjugated profile, and an inner straight conjugated profile, a valley transition curve, and a valley concentric arc inside the pitch circle, which are connected end to end. The corresponding endpoints and connection points are, in sequence, a peak point, a vertex, an outer starting point, a mid-node, an inner starting point, a root point located on a peak symmetry axis, and a valley point located on a valley symmetry axis. The low-leakage Roots rotor profile with a larger shape coefficient of the invention has a larger shape coefficient and a volume utilization coefficient, and a smaller radial leakage rate and a conjugate leakage rate, so it has a higher volumetric efficiency and a better lightweight effect.

The invention relates to the technical field of drilling equipment. The invention provides a rotor, a motor and a screw drill. The rotor comprises a rotor body, and the outer surface of the rotor body is a continuous cycloid spiral curved surface; the rotor main body is provided with a first end and a second end which are oppositely arranged, and a first section body, a middle section body and a second section body which are sequentially arranged along the axis direction of the rotor main body; the outer diameter of the first section body is gradually reduced from the first end to the second end, and the outer diameter of the second section body is gradually reduced from the second end to the first end. The problems that an existing screw drill is large in leakage loss and low in efficiency are solved.

The invention discloses an electronic water pump, a heat management system and a vehicle. The electronic water pump comprises a pump shell provided with a liquid inlet and a liquid outlet, the inner wall face of the pump shell comprises a matching circumferential face and an annular sealing face connected with one axial end of the matching circumferential face, and the matching circumferential face extends in the circumferential direction of the liquid inlet; a liquid inlet cylinder section is arranged at one axial end of the impeller assembly, and at least part of the liquid inlet cylinder section is located in an area defined by the matching circumferential face; the floating opening ring is arranged between the matching circumferential surface and the outer circumferential surface of the liquid inlet cylinder section, the floating opening ring can axially float so as to abut against the annular sealing surface for sealing when the impeller assembly rotates, the inner diameter of the matching circumferential surface is M, the outer diameter of the liquid inlet cylinder section is N, the outer diameter of the floating opening ring is P, the inner diameter of the floating opening ring is L, and M-P is larger than L-N. According to the electronic water pump, the hydraulic efficiency is obviously improved, the required motor efficiency is lower, the size and weight of the motor are reduced, light weight is achieved, the cost is reduced, and the floating opening ring is simple in structure, small in part number and easy to assemble.

The invention discloses a pump body assembly, a compressor and air conditioning equipment, and relates to the technical field of compressors, the pump body assembly comprises a first air cylinder, a second air cylinder and a partition plate, and an exhaust hole of the second air cylinder communicates with a backpressure cavity through an air guide channel; the cross section area of the air guide channel is S1, the cross section area of the exhaust hole of the second air cylinder is S2, and the ratio of S1 to S2 meets the relation that S1 / S2 is larger than or equal to 0.3 and smaller than or equal to 1.2. The length of the air guide channel is L, the diameter of the air guide channel is D, and the ratio of L to D is 1 < = L / D < = 5. According to the scheme, by limiting the ratio (S1 / S2) of the sectional area S1 of the air guide channel to the area S2 of the exhaust hole of the second air cylinder, enough air flows to the back pressure cavity, and therefore the pressure of the back pressure cavity is maintained; the ratio (L / D) of the length L to the diameter D of the communicating hole reduces the pressure loss in the gas flowing process, and the problem that the slip sheet is separated from the outer diameter of the piston roller can be solved.

The invention relates to a battery cell and a battery cell stack. A battery cell is provided with: an electrode body in which a plurality of laminated structures having a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are further laminated; and a tape that is wound and affixed around the outer periphery of the electrode body, the tape having an overlapping portion in which one end side and the other end side in the outer peripheral direction overlap, and the tape having a plurality of stacked structures in the electrode body are stacked in a stacking direction and an end surface in the stacking direction of the electrode body is a stacking surface. The overlapping portion is disposed on a surface other than the laminated surface of the electrode body.

The bidirectional gear pump comprises a front shell, a rear shell, a first shaft hole, a second shaft hole, a third shaft hole, a fourth shaft hole, a first gear shaft and a second gear shaft, wherein the first shaft hole, the second shaft hole, the third shaft hole and the fourth shaft hole are vertically and symmetrically formed in the horizontal center line of the front shell and the rear shell; a first groove and a second groove are formed around the first shaft hole and the second shaft hole, the first gear and the second gear are installed in the grooves, and the first gear and the second gear are connected in a meshed mode; oil drainage grooves are formed in the outer end surfaces; the thicknesses of the first gear and the second gear are consistent with the depths of the first groove and the second groove of the front shell; an oil inlet and an oil outlet are formed in the outer end face of the rear shell and located in the two sides of the vertical center line of the rear shell. No gap exists between the inner end face of the front shell and the inner end face of the rear shell.

The invention discloses a dual-circuit oil circulation supply structure of a horizontal scroll compressor, which includes: a differential pressure oil supply assembly for lubricating a movable scroll bearing and a main bearing and an oil pump oil supply assembly for lubricating a bottom bearing; the differential pressure oil supply assembly includes: an oil-gas separation device and an oil return pipe, and the oil pump oil supply assembly includes: an oil pump and an oil suction pipe. The invention has the following beneficial effects: first, the differential pressure oil supply oil circuit is short, which reduces the pressure drop and leakage in the oil circuit. Second, the bottom bearing is supplied with oil by an oil pump alone instead of differential pressure oil supply, which reduces the amount of differential pressure oil supply to a certain extent, which is beneficial to improving the volumetric efficiency and the refrigeration capacity of the compressor. Third, the frequency conversion applicability is good. In the frequency conversion application, the movable scroll bearing and the main bearing are supplied with differential pressure oil, and the oil supply amount is less affected by the speed change and is not easy to wear; although the bottom bearing is supplied with oil by an oil pump, the oil supply amount is small at low speed, but the load on the bottom bearing is small, the demand for lubricating oil is small, and therefore it is not easy to wear.

The utility model discloses a groove outer vertical type pumping, including main body pump shell, front cover, install in the top of main body pump shell, impeller subassembly is installed in the inside of front cover, drive shaft, rotates and is installed in the inside of main body pump shell, and its top end extends to the inside of front cover and is connected with impeller subassembly, through the setting of impeller subassembly, the back rib of impeller in impeller subassembly is located in the inside of main body pump shell top reservation space, and this ingenious design effectively reduces the gap between impeller and main body pump shell, in the process of pumping operation, and the gap control makes the liquid leakage amount reduce greatly, and more liquid can be transported according to the predetermined path, thereby the volumetric efficiency of pumping is improved significantly, and because the gap reduces, the friction and abrasion produced between impeller and pump shell by relative movement also reduce accordingly, make the service life of impeller and pump shell be effectively prolonged, and the maintenance cost and replacement frequency of equipment are reduced.

The utility model discloses a novel low-pressure oil pump with a strong heat-resistant armature, and relates to the field of automobile accessories. The novel low-pressure oil pump with the strong heat-resistant armature comprises an oil pump body and an armature unit, the oil pump body comprises a shell, a lower end cover and an upper end cover, an oil inlet is formed in the bottom of the lower end cover, a widened containing groove is formed in the lower end cover, and the armature unit comprises an armature body, a driving shaft and a thickened impeller. The armature body is installed in the shell, one end of the driving shaft is connected with the armature body, and the thickened impeller is rotationally arranged at the end of the driving shaft and rotationally arranged in the widened containing groove. According to the novel low-pressure oil pump with the strong heat-resistant armature, under the same rotating speed, the thickened impeller can extract and convey more fuel oil when rotating each time, so that the volumetric efficiency of the oil pump is improved, the single-circle oil supply amount of the oil pump is increased, the required oil supply pressure can be achieved under the lower rotating speed, and the environment temperature can be reduced.

The invention discloses a multi-feed-source coaxial-waveguide composite resonance microwave heating device and a control method, the multi-feed-source coaxial-waveguide composite resonance microwave heating device comprises a waveguide cavity and a plurality of coaxial coupling structures, the top surface of the waveguide cavity is open, and the plurality of coaxial coupling structures are integrated in the cavity wall of the waveguide cavity. Each coaxial coupling structure comprises a coaxial port and a coaxial coupling helix which are connected with each other, the coaxial port serves as an input end of the feed source, and a microwave signal is input into the waveguide cavity through the coaxial port and the coaxial coupling helix in sequence to heat an object to be heated in the waveguide cavity. A coaxial and waveguide composite resonance mode is constructed, impedance matching and heating uniformity are further optimized in combination with gradual change spiral parameter design and a multi-source heating control method, and the method is suitable for the field of industrial heating and precise material processing with extremely high temperature uniformity requirements.

The present invention belongs to the technical field of plunger pumps, and provides a split block detachable pump head with a docking plunger segment. A split block detachable pump head with a docking plunger segment comprises a pump head and a pump body, wherein the pump head and the pump body have a plunger rod inside, and the plunger rod comprises a first plunger segment and a second plunger segment connected to each other, wherein the first plunger segment and the second plunger segment are both located inside the pump body, and the connection between the first plunger segment and the second plunger segment has a nested portion, wherein the nested portion is provided with a radial connecting hole, and a first fastener is provided in the radial connecting hole. The above arrangement is conducive to fully disinfecting and washing the inside and outside of the plunger pump; the nested portion is axially staggered, which can improve the bearing capacity of the axial load and radial load of the first plunger segment and the second plunger segment, and improve the overall stiffness of the plunger rod; the relative position of the second plunger segment and the first plunger segment is positioned by using a radial connecting hole, which can ensure that the volumetric efficiency of the plunger pump remains stable.

The application provides a involute variable-thickness gear pump, and belongs to the technical field of fluid machinery. The gear pump adopts a pair of involute variable-thickness driving gears and driven gears to form a parallel shaft external meshing pair, the thickness of the gears continuously changes along the width direction, and the meshing gap can be self-adaptively adjusted through axial position fine adjustment; the gear pair forms a gradual meshing area along the axial direction, has a dynamic thickness compensation effect, can significantly reduce fluid oil trapping, reduce flow pulsation, improve volumetric efficiency and operation stability. The application has simple structure and strong adaptability, can be compatible with straight teeth / oblique teeth, external meshing / interior meshing structure, and is suitable for high-pressure, low-noise, long-life hydraulic and fluid conveying systems.

The present application relates to a fuel cell module, each of a plurality of fuel cell stack units of the fuel cell module having: a plurality of cells stacked along a first direction; a pair of end plates disposed at both ends of the plurality of cells in the first direction; and a plurality of fastening members erected between the pair of end plates along the first direction to restrain the plurality of cells, the plurality of fuel cell stack units being stacked along a second direction orthogonal to the first direction, the plurality of fastening members including at least one first fastening member on one side of the second direction with respect to the plurality of cells and at least one second fastening member on the other side of the second direction with respect to the plurality of cells, each of the at least one first fastening member being disposed at a position different from any of the at least one second fastening member in a third direction substantially orthogonal to the first direction and the second direction.

The invention discloses a high-efficiency three-claw vacuum pump. The claw rotor profile is simple and consists of only four curves, which solves the problem of large limitations in the selection of design parameters of the three-claw rotor; the traditional claw top and claw bottom arcs are omitted, and the eccentric involute and its envelope are introduced, which significantly improves the volumetric efficiency of the three-claw vacuum pump; the elliptical arc is used at the claw tip to improve the leakage at the claw tip and reduce the wear of the claw tip, which is of great significance to the performance optimization of the claw vacuum pump. At the same time, an axial exhaust port is designed in combination with the rotor profile, so that the gas in the cavity can be completely discharged, avoiding excessive compression of the gas, and effectively reducing the energy consumption of the claw vacuum pump.

The application provides a piston structure for a coal slurry conveying diaphragm pump, which comprises a piston cylinder, a piston rod, a piston disc, and a clamping nut; a threaded mounting section and a piston disc mounting section are sequentially arranged in the middle of the piston rod from left to right; the piston disc is sleeved on the piston disc mounting section of the piston rod and is used for dividing the piston cylinder into two mutually isolated working cavities; the left end of the piston rod penetrates through the piston cylinder; the piston structure further comprises a positioning table; the positioning table is located on the right side of the piston disc mounting section and is integrally arranged with the piston rod, the perpendicularity between the left end surface of the positioning table and the piston rod is not greater than 0.01 mm; the clamping nut is threadedly connected with the threaded mounting section of the piston rod and is used for pressing the piston disc on the left end surface of the positioning table. The piston structure for the coal slurry conveying diaphragm pump, the piston disc is fixed on the piston rod through the positioning table and the clamping nut, the positioning table is integrally arranged with the piston rod, the perpendicularity of the positioning end surface is ensured, and the internal leakage of the piston cylinder is effectively avoided.

The utility model discloses an electronic water pump, heat management system and vehicle. Electronic water pump includes: pump shell is equipped with liquid inlet and liquid outlet, and the inner wall surface of pump shell includes cooperation circumference surface and the annular sealing surface that is connected with the axial one end of cooperation circumference surface, and cooperation circumference surface extends along the periphery of liquid inlet, impeller subassembly, axial one end is equipped with liquid inlet cylinder section, and liquid inlet cylinder section is at least partially located in the region surrounded by cooperation circumference surface, and the outer periphery between cooperation circumference surface and liquid inlet cylinder section is equipped with floating mouth ring, and floating mouth ring can axially float to abut and seal with annular sealing surface under the state that impeller subassembly rotates, and the inner diameter of cooperation circumference surface is M, and the outer diameter of liquid inlet cylinder section is N, and the outer diameter of floating mouth ring is P and the inner diameter is L, and M-P is greater than L-N. The hydraulic efficiency of the electronic water pump according to the utility model embodiment is improved obviously, and the required motor efficiency is lower to reduce the volume and weight of motor, realizes light weight and reduces cost, and the floating mouth ring structure is simple, and the part quantity is few and easy to assemble.

The utility model provides a flow control oil supply system which comprises a first filter and a flow distribution valve, an inlet of the first filter is connected with an oil tank, and an outlet of the first filter is respectively connected with a lubricating pump and an oil supplementing pump. An outlet of the lubricating pump is connected with a heat dissipation unit, and an outlet of the heat dissipation unit is connected with a lubricating connector. An outlet of the oil recharging pump is provided with an oil recharging control unit; the oil recharging control unit is connected with a closed system oil recharging interface; an inlet of the flow distribution valve is connected with the oil supplementing control unit, a first outlet of the flow distribution valve is connected with the heat dissipation unit, and a second outlet of the flow distribution valve is connected with an outlet of the first filter. According to the utility model, through the lubricating pump and the oil supplementing pump, the oil supply of the lubricating system and the oil supplementing system is realized, the use of a large-displacement pump is omitted, the occupied space is small, the cost is reduced, and the volumetric efficiency is improved; and the flow of each path of oil can be adjusted according to requirements.

A volute of the energy-saving type vertical centrifugal foam pump comprises a rigid shell and an elastic lining which are coaxially arranged, the outer side wall of the elastic lining and the inner wall of the rigid shell are connected in a sealed mode and form a closed control cavity, and a plurality of elastic frameworks are distributed in the control cavity; the pump body is provided with a jet vacuum generator, the jet vacuum generator comprises a nozzle inlet, a throat pipe suction chamber and a diffusion pipe outlet which are communicated in sequence, the nozzle inlet is communicated with the liquid discharge pipe through a high-pressure drainage pipe, and the diffusion pipe outlet is communicated to a low-pressure backflow area of the pump body; a negative pressure feedback pipe is connected between the throat pipe suction chamber and the control cavity, and when pumped fluid passes through the nozzle inlet, negative pressure generated in the throat pipe suction chamber sucks the control cavity, so that the elastic lining extrudes the elastic framework and is attached to the rigid shell. The energy of high-pressure fluid at a pump outlet is utilized, controllable negative pressure is generated through the jet flow vacuum generator, the elastic lining is driven to generate radial shrinkage deformation, the section of a volute flow channel is dynamically optimized, and cavitation can be actively restrained.