CN114412825B

CN114412825B - Impeller suitable for automatically controlled silicone oil water pump

Info

Publication number: CN114412825B
Application number: CN202210127944.XA
Authority: CN
Inventors: 彭斯; 吴志鹏; 李东平; 江扬帆
Original assignee: Dongfeng Male Thermal System Co ltd
Current assignee: Dongfeng Male Thermal System Co ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2023-10-10
Anticipated expiration: 2042-02-11
Also published as: CN114412825A

Abstract

The invention relates to an impeller suitable for an electrically controlled silicone oil water pump, which comprises a front cover plate, a rear cover plate and blades, wherein a plurality of blades are uniformly arranged on the rear cover plate and are positioned between the front cover plate and the rear cover plate; the middle part of the rear cover plate is provided with an impeller hub, and the middle part of the front cover plate is provided with a water inlet; the blade comprises a suction surface, a water inlet side, a pressure surface and a water outlet side, wherein the blade inclination angle beta 1 between the pressure surface and the water inlet side is 18-25 degrees, and the blade inclination angle beta 2 between the suction surface and the water inlet side is 20-30 degrees. The blades of the invention adopt a unique design, and more cooling liquid can be gathered in the middle part of the impeller to rotate in the rotating process, so that the flow, the lift and the working efficiency of the water pump with the impeller are all improved compared with those of a main flow water pump, and according to the simulation result, under the same working point: the efficiency of the water pump comprising the invention can reach 64%, and the efficiency of the traditional mechanical water pump ranges from 45% to 58%.

Description

Impeller suitable for automatically controlled silicone oil water pump

Technical Field

The invention relates to a silicone oil water pump, in particular to an impeller suitable for an electric control silicone oil water pump.

Background

The domestic commercial vehicle engine cooling system adopts a direct-connection mechanical water pump, an impeller of the direct-connection mechanical water pump is directly connected with an engine belt pulley or an engine main shaft through a shaft, and when the engine rotates, the impeller synchronously rotates, so that a large amount of ineffective power consumption is generated, and the economical efficiency of fuel oil is not facilitated; frequent cold and hot impact is generated on the radiator cooling system due to the continuous change of the rotating speed of the impeller, so that the interior of the engine is suddenly cold and hot, and the engine is supercooled and easy to accumulate carbon in winter, so that the engine is slowly heated; the rotating speed of the impeller in the direct-connected water pump is not controlled, so that the cooling flow of the engine cannot be accurately controlled, unnecessary friction of the engine is increased, the service lives of the cylinder sleeve and the piston of the engine are reduced, and the durability of the engine is reduced.

The foreign electronic control silicone oil water pump has gradually replaced the direct connection mechanical water pump, impeller and engine in the silicone oil water pump are not directly related, but are driven by the viscous force of silicone oil, and the silicone oil quantity can be adjusted by the control signal emitted by the whole vehicle ECU, so the impeller rotating speed can be adjusted according to the actual temperature of the cooling system, for example: when the temperature of parts in the cooling system is too high, the rotation speed of the engine is increased, and simultaneously, the ECU transmits engagement signals, a large amount of silicone oil enters a working cavity in the clutch, and the impeller rapidly rotates; when the temperature of the parts is normal, the ECU can emit an idle signal, a large amount of silicone oil can flow out of the working cavity, and the impeller enters idle rotation.

The impeller in the direct-connection mechanical water pump is designed by adopting cast iron materials, the production materials and the die are high in cost, the whole weight of the impeller is high, and cavitation phenomenon is easy to occur, so that metal parts on the surface of the impeller can be gradually separated, and the service life of the impeller is reduced.

Disclosure of Invention

In order to solve the problems, the invention provides the impeller suitable for the electric control silicone oil water pump, and the water pump with the impeller is improved in flow, lift and working efficiency compared with a main flow water pump.

The technical scheme adopted by the invention is as follows: an impeller suitable for automatically controlled silicone oil water pump, its characterized in that: the device is arranged at the tail end of the silicone oil water pump and comprises a front cover plate, a rear cover plate and blades, wherein a plurality of blades are uniformly arranged on the rear cover plate and are positioned between the front cover plate and the rear cover plate; the middle part of the rear cover plate is provided with an impeller hub, and the middle part of the front cover plate is provided with a water inlet; the blade comprises a suction surface, a water inlet side, a pressure surface and a water outlet side, wherein the blade inclination angle beta 1 between the pressure surface and the water inlet side is 18-25 degrees, and the blade inclination angle beta 2 between the suction surface and the water inlet side is 20-30 degrees.

Preferably, the impeller hub adopts an outer hexagonal design, and is made of alloy steel with the diameter of 27-30 mm.

Preferably, pressure balance holes are uniformly distributed on the edge of the impeller hub.

Preferably, the edge of the water inlet is provided with a raised stepped sealing structure.

Preferably, the inclination angles of the two end surfaces of the front cover plate are consistent with the inclination angles of the matched volutes, and the thickness of the front cover plate is 2-3 mm.

Preferably, the thickness of the back cover plate is 2-3 mm.

Preferably, a plurality of the blades are arranged on the rear cover plate in a central symmetry manner,

preferably, the number of the blades is 6 to 8.

Preferably, the height of the blade is 13-18 mm, and the thickness of the water inlet side and the water outlet side is 2mm.

Preferably, the water inlet side and the water outlet side are designed to be cambered surfaces and are in chamfer transition with the suction surface and the pressure surface.

The beneficial effects obtained by the invention are as follows:

1. the impeller is made of nylon PPS and filled with 40% glass fiber, actual filling components can be adjusted according to customer requirements and different diameters of the impeller, and compared with the current main stream cast iron, steel or cast aluminum impellers, the weight of the impeller is greatly reduced, the lightweight design is realized, and the load of an engine cooling system can be reduced;

2. the impeller of the invention adopts an integrated design, and can be manufactured by only one set of mould, the mould can be repeatedly used, the production process is simple, the consistency of the produced impeller is better, the main stream metal impeller is manufactured by a sand mould, the cost of the mould is low, but after the impeller is manufactured once, the sand mould can be damaged, so that a new mould is required to be repeatedly manufactured, the production process is more complex, and the consistency of the produced impeller is poorer;

3. compared with the existing mainstream 'open' design, the impeller is additionally provided with the front cover plate and the rear cover plate, so that the turbulence among the blades in the impeller can be avoided in the rotating process, and the impeller can be ensured to rotate stably for a long time; the closed impeller has complete front and rear cover plates, so that tiny particles can be prevented from abrading a runner of the water pump, and the working efficiency of the water pump is ensured;

4. the blades in the invention adopt a unique flow guiding structure and a curved surface design, and more cooling liquid can be gathered in the middle part of the impeller to rotate in the rotating process, so that the flow, the lift and the working efficiency of the water pump with the impeller are all improved compared with those of a main flow water pump, and according to the simulation result, under the same working point: the efficiency of the water pump comprising the invention can reach 64%, and the range of the efficiency of the traditional mechanical water pump is 45% -58%; when the impeller rotates, more air can be gathered in the middle part of the impeller, so that the air pressure in the middle part is higher, which means that the boiling phenomenon (cavitation phenomenon) of the cooling liquid is not easy to occur in the middle part of the impeller, thereby reducing the corrosion and impact of the cavitation phenomenon on the impeller and the clutch of the water pump, reducing the noise when the water pump operates, optimizing the driving experience of a driver, and avoiding the degradation influence of the cavitation phenomenon on the efficiency of the water pump.

Drawings

FIG. 1 is a schematic structural view of a silicone oil water pump;

FIG. 2 is a schematic structural view of a volute;

FIGS. 3-5 are schematic structural views of impellers;

FIG. 6 is a schematic view of the front cover plate structure;

FIGS. 7-8 are schematic structural views of a back cover plate and a blade;

FIGS. 9-10 are schematic structural views of a blade;

FIG. 11 is a control schematic diagram of an electrically controlled silicone oil water pump;

reference numerals: 00. electrically controlled silicone oil water pump; 01. a volute; 02. a volute water inlet; 03. a volute water outlet; 17. an impeller; 171. a front cover plate; 1711. a vane inlet; 1712. a stepped seal structure; 172. a back cover plate; 1721. an impeller hub; 1722. a pressure balance hole; 173. a blade; 1731. a water inlet edge; 1732. a water outlet edge; 1733. a suction surface; 1734. a pressure surface.

Detailed Description

The invention will be further described with reference to the drawings and the specific examples.

Referring to fig. 1-2, an impeller 17 suitable for an electrically controlled silicone oil water pump is positioned at the tail end of an electrically controlled silicone oil water pump 00, a matching part is a volute 01, the volute 01 is fixedly connected with the silicone oil water pump 00 through a screw, and a volute water inlet 02 and a volute water outlet 03 are arranged on the volute 01.

In one embodiment, the impeller 17 is made of PPS-GF40, and has a diameter ranging from 120 mm to 135mm, so that the flow and lift requirements of most engine platforms can be met. When the impeller 17 rotates, a negative pressure area is formed in the middle of the impeller 17, and under the action of the negative pressure, the cooling liquid flows into the impeller 17 from the volute water inlet 02, flows along the volute water channel after centrifugal pressurization, and flows out from the volute water outlet 03.

In one embodiment, the impeller 17 is a "closed" impeller, and the flow, head and efficiency of the pump are improved over conventional "open" or "semi-open" impellers.

As shown in conjunction with fig. 3 to 10, in the present embodiment, the impeller 17 includes a front cover plate 171, a rear cover plate 172, and vanes 173, and a plurality of vanes 173 are uniformly arranged on the rear cover plate 172 between the front cover plate 171 and the rear cover plate 172; the middle part of the rear cover plate 172 is provided with an impeller hub 1721, and the middle part of the front cover plate 171 is provided with a water inlet 1711; as shown in connection with fig. 7-10, the vane 173 includes a suction surface 1733, a water inlet side 1731, a pressure surface 1734, and a water outlet side 1732, wherein a blade pitch β1 between the pressure surface 1734 and the water inlet side 1731 is 18 ° to 25 °, and a blade pitch β2 between the suction surface 1733 and the water inlet side 1731 is 20 ° to 30 ° (as shown in the following table: β1=18° to 25 °, β2=20° to 30 °, and the water pump performance is optimal).

In one embodiment, the impeller hub 1721 is of a unique hexagonal design, and is of alloy steel with a diameter of 27-30 mm. The design can strengthen the strength of the hub to resist the impact of cooling liquid on the impeller hub 1721, and prolong the service life of the impeller hub 1721; the viscosity of the injection molding can be improved, and the impeller hub 1721 and the blades 173 can be better combined, so that the phenomenon of shaking or even falling off of the impeller during high-speed rotation can be prevented.

The edge of the impeller hub 1721 is uniformly distributed with pressure balance 1722, and the pressure balance 1722 is arranged on the back cover plate 172 and used for balancing the pressure difference at two sides of the back cover plate 172, which belongs to one of the most economical and effective methods for reducing the axial force borne by the impeller 17. The pitch circle diameter of the pressure balancing hole 1722 needs to be obtained by combining the distribution rule of cooling hydraulic pressure in specific use, and the diameter of the pressure balancing hole 1722 needs to be obtained by FEA simulation to obtain the optimal solution.

In an embodiment, the middle part of the front cover plate 171 is provided with a circular water inlet 1711, the diameter of the water inlet 1711 is the same as that of the water inlet 02 of the volute, when the impeller 17 rotates, cooling liquid can enter through the water inlet 02 of the volute and the water inlet 1711 of the impeller, a special sealing structure 1712 is arranged at the edge of the water inlet 1711, the sealing structure 1712 adopts a sectional ladder design and comprises a protruding structure, and the cooling liquid can be prevented from flowing into the impeller 17 from a gap between the front cover plate 171 and the volute 01; the front end surface of the front cover plate 171 is provided with a unique inclination design, and the inclination is consistent with the inclination of the matching volute 01, so that the matching gap uniformity of the front cover plate 171 and the volute 01 can be ensured; the rear end face of the front cover plate 171 is also inclined and parallel to the front end face of the front cover plate 171, and the inclined structure can reduce friction force between the front cover plate 171 and the cooling liquid during flowing, so that the cooling liquid can move conveniently, and the thickness of the whole front cover plate 171 is 2-3 mm, and the front cover plate 171 is quite light and thin.

In this embodiment, a plurality of blades 173 are disposed on the back cover 172, the channels between adjacent blades 173 are diversion channels, and the thickness of the whole back cover 172 is 2-3 mm, which is very light and thin.

In this embodiment, the blades 173 are located between the front cover plate 171 and the rear cover plate 172, the blades 173 can provide centrifugal force and push the cooling liquid to flow out of the volute water outlet 03 along the diversion channel, and considering the stability of the cooling liquid flow, the blades 173 are arranged in a central symmetry manner, and the number of the blades 173 is 6-8; the thickness of the vane 173 is varied, the thickness of the water inlet side 1731 and the water outlet side 1732 is 2mm, so that the coolant can be discharged, and the main point of action of the coolant is in the middle of the vane 173, where the thickness is about 2.5mm. The blades 173 have a height ranging from 13 to 18mm, and the boundaries of the blades 173 include a suction side 1733, a water inlet side 1731, a pressure side 1734, and a water outlet side 1732.

In this embodiment, the water inlet edge 1731 adopts a unique cambered surface design and adopts a chamfer transition with the suction surface 1733 and the pressure surface 1734, and the water inlet edge 1731 is used for introducing cooling liquid; the pressure surface 1734 has a lower pressure, and the pressure surface 1734 is a working surface of the impeller and bears a higher pressure, the suction surface 1733 and the pressure surface 1734 are both designed to be plane in accordance with fluid mechanics so as to reduce friction force generated when the cooling liquid flows, and the water outlet edge 1732 is designed to be arc surface so as to accelerate the cooling liquid to flow out.

As shown in fig. 11, the input signals of the engine ECU include: engine load, coolant temperature, retarder signal, air conditioner compressor signal, EGR signal, etc., which are mostly related to the surrounding environment. The ECU periodically collects the input signals, and sends different PWM signals to the electrically controlled silicone oil water pump 00 based on an internal algorithm under different stage demands, so as to adjust the rotation speed of the impeller 17, reduce the damage to the service life of other components caused by long-time operation of the impeller 17, and simultaneously play a role in reducing the power consumption of the engine.

When the electronic control silicone oil water pump 00 receives the PWM signal output by the ECU control unit of the engine, a magnetic field is formed inside the electronic control silicone oil water pump 00, and an internal control valve rod can be opened or closed under the action of magnetic force so as to adjust the silicone oil quantity in a working cavity of the electronic control silicone oil water pump 00, and the rotating speed of the impeller 17 is adjusted by means of the viscous force of the silicone oil, when the silicone oil quantity is larger, the rotating speed of the impeller 17 is closer to the rotating speed of the engine, and conversely, when the silicone oil quantity is smaller, the rotating speed of the impeller 17 is lower. For example: when the load of the engine is low and the cooling system does not need excessive cooling liquid, the ECU sends a PWM value of 100% high level, at the moment, the silicone oil in the working cavity of the electrically controlled silicone oil water pump 00 is very little, the rotating speed of the impeller 17 is less than 1000rpm, the impeller 17 is in an idling state, vibration is reduced, and meanwhile, the power consumption of the engine is reduced; when the ECU collects relevant input information and needs the impeller 17 to run at a high speed, the ECU inputs the PWM to be 0 low level, at this time, the silicone oil will continuously flow into the working cavity in the electrically controlled silicone oil pump 00, the electrically controlled silicone oil pump 00 will enter the engaged state, and the impeller 17 will output a high rotation speed.

The real-time rotating speed of the impeller 17 can be fed back to an engine ECU system by means of a rotating speed sensor inside the electric control silicone oil water pump 00 and based on a Hall effect, the ECU can carry out PID adjustment according to the deviation value of the current target rotating speed and the fed back actual rotating speed, calculate a PWM value to be compensated, update the target rotating speed and transmit the target rotating speed to the electric control silicone oil water pump 00 again so as to continuously adjust the rotating speed of the impeller 17, realize stepless speed regulation, and finally the trace rotating speed of the impeller 17 is quickly approximate to the target rotating speed.

The electrically controlled silicone oil water pump 00 is driven by connecting a belt pulley with an engine crankshaft, and the driving source is from the engine speed. The internal working effective structure of the water pump 00 is divided into a working cavity and an oil storage cavity, the rotating speed of the impeller can be increased after the working cavity of the electrically controlled silicone oil water pump 00 is filled with silicone oil, and once the silicone oil in the working cavity flows back to the oil storage cavity, the rotating speed of the impeller is reduced.

The foregoing has shown and described the basic principles and main structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An impeller suitable for automatically controlled silicone oil water pump, its characterized in that: the device is arranged at the tail end of the silicone oil water pump and comprises a front cover plate, a rear cover plate and blades, wherein a plurality of blades are uniformly arranged on the rear cover plate and are positioned between the front cover plate and the rear cover plate; the middle part of the rear cover plate is provided with an impeller hub, and the middle part of the front cover plate is provided with a water inlet; the blade comprises a suction surface, a water inlet side, a pressure surface and a water outlet side, wherein the blade inclination angle beta 1 between the pressure surface and the water inlet side is 18-25 degrees, and the blade inclination angle beta 2 between the suction surface and the water inlet side is 20-30 degrees.

2. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: the impeller hub adopts an outer hexagonal design, and is made of alloy steel with the diameter of 27-30 mm.

3. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: pressure balance holes are uniformly distributed on the edge of the impeller hub.

4. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: the edge of the water inlet is provided with a raised stepped sealing structure.

5. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: the inclination angles of the two end faces of the front cover plate are consistent with those of the matched spiral case, and the thickness of the front cover plate is 2-3 mm.

6. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: the thickness of the rear cover plate is 2-3 mm.

7. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: the blades are arranged on the rear cover plate in a central symmetry mode.

8. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: the number of the blades is 6-8.

9. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: the height of the blade is 13-18 mm, and the thickness of the water inlet side and the water outlet side is 2mm.

10. The impeller for an electrically controlled silicone oil water pump of claim 1, wherein: the water inlet side and the water outlet side are designed by adopting cambered surfaces and are in chamfer transition with the suction surface and the pressure surface.