CN114412629A - Electric control silicon oil clutch water pump - Google Patents
Electric control silicon oil clutch water pump Download PDFInfo
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- CN114412629A CN114412629A CN202210127959.6A CN202210127959A CN114412629A CN 114412629 A CN114412629 A CN 114412629A CN 202210127959 A CN202210127959 A CN 202210127959A CN 114412629 A CN114412629 A CN 114412629A
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- silicone oil
- impeller
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- water pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
- F01P5/12—Pump-driving arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to an electric control silicon oil clutch water pump, which comprises a silicon oil clutch front cover, a hub, a driving disc, a separating disc, a control valve rod, a belt pulley, a three-ring bearing, an electric control solenoid, a rotating speed sensor, a signal ring, a pump body rear cover and an impeller, and realizes the stepless speed change control of the rotating speed of the impeller of the electric control silicon oil pump, thereby realizing the stable change of the flow of engine cooling liquid, bringing the function of the electric control silicon oil clutch water pump into full play, better reducing the oil consumption of an engine and improving the cooling capacity of the water pump; the influence of cold and hot impact of the cooling system on engine components is reduced, and the service life of the engine cooling system components is prolonged, particularly when the engine speed is frequently changed; the problem of after-sale that the whole vehicle is quickly warmed up and the engine is supercooled and easy to deposit carbon can be solved, and a technical foundation is laid for the design index of the long service life of the whole vehicle engine in the future.
Description
Technical Field
The invention relates to an automobile cooling system, in particular to an electric control silicon oil clutch water pump.
Background
The conventional direct-connected water pump is adopted in the conventional commercial vehicle engine cooling system, and the rotating speed of an impeller in the direct-connected water pump changes along with the change of the rotating speed of an engine, so that a large amount of ineffective power consumption is generated, and the economical efficiency of fuel oil is not facilitated on the one hand; on the other hand, the continuous change of the rotating speed of the direct-connected water pump also generates frequent cold and hot impact on a radiator cooling system, so that the service life of components of the engine cooling system is shortened; 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 a cylinder sleeve and a piston of the engine are shortened, and the durability of the engine is reduced.
The traditional driving mode of directly connecting the water pump is connected with an engine crankshaft or a gear and a belt pulley, because the directly connecting water pump is directly assembled with the engine accessories, a transition connector is not arranged in the middle of the directly connecting water pump, the rotating speed of an impeller is synchronous with the rotating speed of a wheel train or the rotating speed of the crankshaft, the changing frequency of the rotating speed of the engine is high, the rotating speed of the impeller is influenced to change along with the change of the rotating speed of the engine, the water flow can also change along with the change of the rotating speed of the engine, the interior of the engine is suddenly cooled and suddenly heated, the engine is supercooled and easily deposited with carbon, the rotating speed of the impeller of the water pump can not be reduced in winter, and the engine can also be heated slowly.
Disclosure of Invention
In order to solve the problems, the invention provides the electric control silicon oil clutch water pump, the rotating speed of an impeller of the electric control silicon oil clutch water pump can realize stepless speed change, so that the stable change of the flow of the cooling liquid of the engine is realized, the cooling efficiency of the water pump is high, and the oil consumption of the engine is effectively reduced.
The technical scheme adopted by the invention is as follows: the utility model provides an automatically controlled silicon oil clutch water pump which characterized in that: the engine oil cylinder comprises a silicone oil clutch front cover, a hub, a driving disc, a separating disc, a control valve rod, a belt pulley, a three-ring bearing, an electric control solenoid, a rotating speed sensor, a signal ring, a pump body rear cover and an impeller, wherein the silicone oil clutch front cover is fixedly connected with the belt pulley, and the belt pulley is connected with an engine crankshaft; the three-ring bearing comprises a central shaft, an inner bearing and an outer bearing, wherein the inner bearing is sleeved on the central shaft, and the outer bearing is sleeved on the inner bearing;
a driving disc, a separating disc and a control valve rod are arranged between the silicone oil clutch front cover and the belt pulley, the front end of the central shaft sequentially penetrates through the control valve rod, the separating disc and the driving disc and then extends into the silicone oil clutch front cover, a wheel hub is arranged at the front end of the central shaft, the separating disc and the driving disc are fixed through press fitting, the driving disc is fixedly connected with the wheel hub, and the control valve rod is arranged between the separating disc and the belt pulley;
the rear end face of the front cover of the silicone oil clutch and the front end face of the driving disc are provided with annular working teeth which are matched with each other, and a gap formed between the annular working teeth which are meshed with each other forms a working cavity for flowing of silicone oil; the front end surface of the belt pulley is provided with an annular groove, and the annular groove and the rear end surface of the separating disc form an oil storage cavity; the separating disc is provided with an oil outlet and an oil return hole which are communicated with the oil storage cavity and the working cavity, and the control valve rod is provided with valves respectively matched with the oil outlet and the oil return hole;
the belt pulley is tightly matched and arranged on the inner bearing, the pump body rear cover is tightly matched and arranged on the outer bearing, an electric control solenoid is arranged between the belt pulley and the pump body rear cover, the electric control solenoid is fixedly connected with the pump body rear cover, and the electric control solenoid controls the action of the control valve rod, so that the on-off of the oil outlet and the oil return hole is controlled, and the amount of silicon oil in the working cavity is adjusted;
the rear end of the central shaft is sequentially provided with a rotation speed sensor, a signal ring and an impeller, the impeller and the central shaft rotate synchronously, and the rotation speed sensor and the signal ring are integrally assembled and used for collecting the rotation speed of the impeller.
Preferably, the impeller comprises a front cover plate, a rear cover plate and blades of the silicone oil clutch, and 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 of the silicone oil clutch; the middle part of the rear cover plate is provided with an impeller hub, and the middle part of the front cover plate of the silicone oil clutch is provided with a water inlet; the blade comprises a suction surface, a water inlet edge, a pressure surface and a water outlet edge, wherein the blade inclination angle beta 1 between the pressure surface and the water inlet edge is 18-25 degrees, and the blade inclination angle beta 2 between the suction surface and the water inlet edge is 20-30 degrees.
Preferably, when the load of the engine is low and sufficient cooling liquid is not needed, the electric control solenoid receives a PWM signal output by an ECU control unit of the engine, the electric control solenoid controls the action of the control valve rod, the oil outlet is closed, and the oil return hole is opened; the silicone oil in the working cavity flows to the oil storage cavity, the shearing force between the rear end face of the front cover of the silicone oil clutch and the working teeth on the front end face of the driving disc is reduced, and the impeller gradually enters idle rotation; the rotating speed of the water pump of the electric control silicon oil clutch is less than 1000 rpm.
Preferably, when the load of the engine is increased and sufficient cooling liquid is needed, the electric control solenoid receives a PWM signal output by an ECU (electronic control Unit) of the engine, the electric control solenoid controls the action of the control valve rod, the oil outlet is gradually opened, and the oil return hole is gradually closed; the silicone oil in the oil storage cavity flows to the working cavity, the shearing force between the rear end face of the front cover of the silicone oil clutch and the working teeth on the front end face of the driving disc is increased, and the rotating speed of the impeller gradually tends to be consistent with that of the belt pulley.
Preferably, after a signal acquired by the engine ECU is input, stepless speed regulation is carried out on the actual speed of the impeller, the actual output rotating speed of the impeller acquired by the rotating speed sensor and the signal ring is transmitted to the engine ECU, the engine ECU compares the rotating speed of the impeller required by the water pump flow required by the engine in the current period with the actual rotating speed, and then outputs a compensation PWM value calculated by PID gain to carry out stepless speed regulation on the rotating speed of the electric control silicon oil water pump impeller again, so that a closed-loop control system is formed.
Preferably, the front cover of the silicon oil clutch and the belt pulley are assembled and fixed through bolts, the design height of a cooling fin on the front cover of the silicon oil clutch is 15-25 mm, the height of a working tooth on the front cover of the silicon oil clutch is 4-6 mm, the width of the working tooth is 0.5-1.2 mm, the tooth distribution diameter is 50-90 mm, and the tooth number is 4-7.
Preferably, the diameter range of the driving disc is 80-100 mm, the fit radial clearance between the working teeth on the driving disc and the working teeth on the front cover of the silicone oil clutch is 0.3-0.4 mm, and the axial clearance is 0.5-0.7 mm; the height of the working teeth on the driving disc is 4-6 mm, the tooth width is 0.5-1.2 mm, and the diameter range is 50-90 mm.
Preferably, the belt pulley comprises an outer shell and a built-in stainless steel sleeve with a magnetic isolation function, the separating disc is fixedly clamped on the front end face of the belt pulley, and the built-in stainless steel sleeve is connected with the outer shell through laser welding; the number of teeth of belt teeth on the outer shell is 7-12, and the diameter range of the belt teeth is 110-140 mm; the outer diameter of the built-in stainless steel sleeve is 70-90 mm, and the inner diameter of the built-in stainless steel sleeve is 60-70 mm.
Preferably, the oil storage cavity is of an annular concave body, the diameter of the outer ring is 95-98 mm, the diameter of the inner ring is 80-87 mm, and the depth of the groove is 8-9 mm.
Preferably, the diameter of the oil outlet is 2-4 mm, the diameter of the oil return hole is 2-3 mm, the angle between the two holes is 55-65 degrees, and the reference circle diameter of the two holes is 90-100 mm.
The beneficial effects obtained by the invention are as follows:
1. the invention realizes the stepless speed change control of the rotating speed of the impeller of the electric control silicone oil pump, thereby realizing the stable change of the flow of the cooling liquid of the engine, exerting the function of the water pump of the electric control silicone oil clutch extremely, reducing the oil consumption of the engine better and improving the cooling capacity of the water pump;
2. the invention reduces the influence of cold and hot impact of the cooling system on engine parts, prolongs the service life of the engine cooling system parts, and particularly when the rotating speed of the engine changes frequently;
3. the invention can reduce the fuel consumption of the engine, improve the fuel efficiency of the engine and enhance the cooling efficiency of the cooling system in the idle state of the engine; the electric control silicon oil pump adopts ECU closed-loop control logic, the water flow can be adjusted along with the change of the engine load or the temperature of the engine coolant, thereby adjusting the rotating speed of the impeller of the water pump, the reduction of the rotating speed of the impeller can reduce the power consumption of the impeller and is beneficial to the reduction of the power consumption of the engine, thus the fuel efficiency of the engine can be improved to 50.5 percent (the Weichai WP13H engine adopts the technology, and the fuel efficiency of the engine is improved to 50.5 percent from the efficiency of 45 percent originally adopting a direct connection water pump technology)
4. The flow of the water pump is variable and controllable, the flow of the water pump can be intelligently and accurately controlled according to different loads of a whole vehicle engine, different road conditions and different environmental temperatures during driving, the useless power consumption of the impeller is reduced, the efficiency of the water pump is improved, and the efficiency of the existing water pump can be more than 61%;
5. the electric control silicon oil clutch water pump can solve the problems of quick vehicle warming and after-sale that the engine is too cold and easy to deposit carbon, and lays a technical foundation for the design index of long service life of the vehicle engine in the future. When a commercial truck is started in winter, because the internal temperature of an engine is too low, the rotation speed of an impeller is uncontrollable and can change along with the change of the rotation speed of the engine by adopting a direct-connection water pump in the past, the rotation speed of the impeller cannot be reduced to less than 1000rpm, the water flow is large, the engine cannot realize rapid internal temperature rise, and the engine is not favorable for winter heating; by adopting the electric control silicone oil pump, when the engine is started in winter, the rotating speed of the impeller is controlled to reduce the water flow by less than 1000rpm, so that the engine is quickly warmed up, and the internal temperature of the engine is raised to facilitate the full combustion of fuel oil and reduce carbon deposition.
Drawings
FIG. 1 is an exploded view of an electric control silicone oil clutch water pump according to the present invention;
FIG. 2 is a cross-sectional view of an electrically controlled silicone oil clutch water pump;
FIG. 3 is a schematic structural diagram of a front cover of a silicone oil clutch;
FIG. 4 is a schematic diagram of the engagement between the front cover of the silicone oil clutch and the driving plate;
FIG. 5 is a schematic view of the engagement of a pulley with a separator plate;
FIG. 6 is a schematic view of the control valve stem;
FIG. 7 is a schematic view of the structure of the separating tray;
FIGS. 8-9 are schematic views of the assembly of the control valve stem and the release plate;
FIG. 10 is a schematic structural view of a rear cover of the pump body;
FIGS. 11-13 are schematic views of the impeller construction;
FIG. 14 is a schematic structural view of a front cover plate of a silicone oil clutch;
FIGS. 15-16 are schematic views of the construction of the aft cover plate and the bucket;
FIGS. 17-18 are schematic views of the blade configuration;
FIG. 19 is a schematic structural view of a three-ring bearing;
FIG. 20 is a control schematic diagram of an electrically controlled silicon oil water pump;
reference numerals: 1. a clutch bolt; 2. a silicone oil clutch front cover; 21. a heat dissipating fin; 22. a front cover working tooth; 3. a clutch O-ring; 4. a clutch hub bolt; 5. a hub; 6. a driving disk; 7. separating the disc; 71. an oil outlet hole; 72. an oil return hole; 8. a control valve stem; 81. a valve; 9. a belt pulley; 91. an outer housing; 92. a stainless steel sleeve is arranged inside; 911. outer housing teeth; 10. a solenoid mounting bolt; 11. an electrically controlled solenoid; 12. a three-ring bearing; 121. a central shaft; 122. an inner bearing; 123. an outer bearing; 13. a rotational speed sensor; 14. a signal loop; 15. water sealing; 16. a pump body rear cover; 17. an impeller; 171. a silicone oil clutch front cover plate; 1711. an impeller water inlet; 1712. a stepped sealing structure; 172. a rear cover plate; 1721. an impeller hub; 1722. a pressure balance hole; 173. a blade; 1731. water inlet edge; 1732. discharging water; 1733. a suction surface; 1734. a pressure surface; 18. assembling bolts for the impeller; 1.1, a working cavity; 1.2 and an oil storage cavity.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments.
As shown in fig. 1-19, the electric control silicone oil clutch water pump of the present invention comprises a silicone oil clutch front cover 2, a hub 5, a driving disk 6, a separating disk 7, a control valve rod 8, a belt pulley 9, a three-ring bearing 12, an electric control solenoid 11, a rotation speed sensor 13, a signal ring 14, a pump body rear cover 16 and an impeller 17, wherein the silicone oil clutch front cover 2 and the belt pulley 9 are fixedly connected, and the belt pulley 9 is connected with an engine crankshaft; the three-ring bearing 12 comprises a central shaft 121, an inner bearing 122 and an outer bearing 123, wherein the inner bearing 122 is sleeved on the central shaft 121, and the outer bearing 123 is sleeved on the inner bearing 122; a driving disc 6, a separating disc 7 and a control valve rod 8 are arranged between the silicone oil clutch front cover 2 and the belt pulley 9, the front end of a central shaft 121 sequentially penetrates through the control valve rod 8, the separating disc 7 and the driving disc 6 and then extends into the silicone oil clutch front cover 2, a hub 5 (used for axial positioning) is arranged at the front end of the central shaft 121, the separating disc 7 and the driving disc 6 are fixed through press fitting, the driving disc 6 is fixedly connected with the hub 5, and the control valve rod 8 is arranged between the separating disc 7 and the belt pulley 9;
referring to fig. 4, the rear end face of the front cover 2 of the silicone oil clutch and the front end face of the driving disk 6 are both provided with mutually matched annular working teeth, and after the annular working teeth of the front cover and the driving disk are mutually meshed, a gap formed between the annular working teeth forms a working cavity 1.1 for flowing of silicone oil; referring to fig. 5, an annular groove is formed in the front end face of the belt pulley 9, an oil storage cavity 1.2 is formed by the annular groove and the rear end face of the separating disc 7, an oil outlet 71 and an oil return hole 72 (see fig. 7) which communicate the oil storage cavity 1.2 and the working cavity 1.1 are formed in the separating disc 7, and a valve 81 which is respectively matched with the oil outlet 71 and the oil return hole 72 is formed in the control valve rod 8 (see fig. 6, the valve is similar to a rod structure, and one end of the valve is matched with the oil outlet while the other end of the valve is matched with the oil return hole);
the belt pulley 9 is arranged on the inner bearing 122 in a tight fit manner, the pump body rear cover 16 is arranged on the outer bearing 123 in a tight fit manner, the electric control solenoid 11 is arranged between the belt pulley 9 and the pump body rear cover 16, the electric control solenoid 11 is fixedly connected with the pump body rear cover 16, and the electric control solenoid 11 controls the action of the control valve rod 8, so that the on-off of the oil outlet hole 71 and the oil return hole 72 is controlled, and the silicon oil amount in the working cavity 1.1 is adjusted; the rear end of the central shaft 121 is sequentially provided with a rotating speed sensor 13, a signal ring 14 and an impeller 17, the impeller 17 and the central shaft 121 rotate synchronously, and the rotating speed sensor 13 and the signal ring 14 are integrally assembled and used for collecting the rotating speed of the impeller 17.
The electric control silicon oil clutch water pump of the invention can be structurally divided into: external drive, internal control and driven output, and through closed loop circulation control, can accurate control impeller rotational speed precision 200 rpm.
In terms of external driving: the assembly of the belt pulley 9 and the silicone oil clutch front cover 2 is realized through the clutch bolt 1, the belt pulley 9 is connected with an engine crankshaft gear train through a belt, the electric control silicone oil pump is driven through gear train ratios with different speed ratios, and the input rotating speed of different electric control silicone oil pumps is obtained. The gear train speed ratio is larger, the input rotating speed of external drive is higher, the flow and lift indexes of the electric control silicone oil pump are higher, but the high-speed resistant technical requirement on a bearing of the electric control silicone oil pump is higher. The belt on the crankshaft of the engine is connected and matched with the belt pulley 9, and the tension of the belt meets the requirement of no slip contact before a gear train.
Internal control aspect: the ECU system of the whole vehicle is connected through the electric control solenoid 11, and different external input conditions of the engine can be combined, such as: engine load, engine coolant temperature, EGR and the like, and different PWM signals are calculated through PID control of an ECU to carry out accurate closed-loop control on the flow of the water pump, so that the response time and the response speed of the water pump of the electric control silicone oil clutch are controlled; meanwhile, the actual rotating speed of the impeller 17 is fed back to an ECU system of the whole vehicle through the electric control solenoid 11, after the ECU system collects the difference between the actual rotating speed and the target rotating speed of the impeller 17, a new PWM value is recalculated through PID closed-loop control and is input to the electric control silicone oil water pump, the output rotating speed of the impeller 17 is continuously adjusted, and the flow rate of the water pump is adjusted. Application of the PID algorithm: p is proportional adjustment, the value I is integrated during the process, the value D is differential, the rotating speed of the impeller is controlled by mutually constraining, comprehensively calculating and outputting a dynamically-changed PWM value through three values, and the average 20us is used as the calculation cycle frequency, so that the PWM value required by the rotating speed of the electrically-controlled silicon oil-water pump clutch can be quickly found.
Driven output aspect: the invention has an oil outlet hole and an oil return hole system inside, the normal condition belongs to a dynamic counter balance state, the difference of the oil outlet speed and the oil return speed determines the conversion and adjustment of the impeller 17, the torque is transmitted to the impeller 17 by the meshing through the filling amount of the silicon oil in the working cavity 1.1 between the front cover 2 of the silicon oil clutch and the driving disc 6, wherein the amount of the silicon oil in the working cavity 1.1 is controlled by the opening degree of the oil outlet hole 71 of the internal control valve 8 and the oil storage cavity 1.2, the opening degree of the control valve rod 8 is influenced by the magnetic force of the electromagnetic coil in the electric control solenoid 11, and the strength of the magnetic force of the electromagnetic coil is determined by the PWM value output by the ECU of the whole vehicle. Under the normal running of the whole vehicle, the requirement on water flow required when the load is low is not high, the required rotating speed of the electric control silicone oil pump is low, most silicone oil is in the oil storage cavity 1.2 at this time, once the load of an engine is increased or the water temperature is increased, the silicone oil in the oil storage cavity 1.2 enters the working cavity 1.1, and the requirement on the rotating speed increase of the impeller 17 and intelligent control are completed.
As shown in fig. 5, the silicone oil clutch front cover 2 and the belt pulley 9 are assembled into a whole through the clutch bolt 1 to realize the function of providing a power source, the design height of the radiating fins 21 of the silicone oil clutch front cover 2 is 15-25 mm, and the temperature in the working cavity 1.11.1 can be ensured to be less than 200 ℃, so that the service life of the clutch is prolonged; the working teeth 22 of the front cover 2 of the silicone oil clutch have the tooth height of 4-6 mm, the tooth width of 0.5-1.2 mm, the tooth distribution diameter of 50-90 mm and the tooth number of 4-7, and the maximum torque of the clutch can be ensured to reach 17Nm through the design; the material of the silicone oil clutch front cover 2 is an aluminum alloy material, so that the silicone oil clutch front cover is light on one hand, and has better heat-conducting property than the traditional stainless steel material on the other hand.
The belt pulley 9 is composed of two parts, namely an outer shell 91 and a built-in stainless steel sleeve 92, in order to guarantee the sealing performance of the part, the built-in stainless steel sleeve 92 and the outer shell 91 are manufactured through a laser welding process, the laser welding length is 2-4 mm, the magnetic isolation function of the built-in stainless steel sleeve 92 is achieved through the design, and the closed loop magnetic force is not exposed. The number of teeth of the belt pulley 911 on the outer housing 91 is 7 to 12, and the diameter range thereof is 110 to 140 mm. The built-in stainless steel sleeve 92 has an outer diameter of 70-90 mm and an inner diameter of 60-70 mm. The outer shell 91 is made of alloy steel material to improve the wear resistance and hardness of the outer shell 91.
A gap exists between the annular working teeth on the front cover 2 of the silicon oil clutch and the annular working teeth of the driving disc 6 after meshing to form a working cavity 1.1, when silicon oil is injected, the shearing force of the silicon oil can be transmitted, the silicon oil enters the working cavity 1.1 to form the shearing force, and the injection amount of the silicon oil and the gap between the teeth are matched to meet the design value of the torque of the clutch.
The diameter of the driving disc 6 is 80-100 mm, the front end face of the driving disc 6 is provided with annular working teeth to match the annular working teeth on the rear end face of the front cover 2 of the silicon oil clutch, the matching radial clearance between the annular working teeth is 0.3-0.4 mm, the axial clearance is 0.5-0.7 mm, the tooth height of the annular working teeth on the driving disc 6 is 4-6 mm, the tooth width is 0.5-1.2 mm, and the diameter is 50-90 mm, the maximum torque is 17N.m according to the design size definition, the driving disc 6 is made of aluminum alloy, heat conduction is facilitated, and the internal temperature of the clutch is less than 200 ℃.
The oil storage cavity 1.2 is formed by matching the separating disc 7 and the belt pulley 9, the structure of the oil storage cavity 1.2 is an annular concave body, the diameter of the outer ring is 95-98 mm, the diameter of the inner ring is 80-87 mm, and the depth of the groove is 8-9 mm. The volume design of the oil storage cavity 1.2 can ensure the reasonability of the silicon oil amount in the oil storage cavity, and the rotating speed of the clutch can be lower than 1000rpm when the clutch idles. The silicone oil in the oil reservoir 1.2 can flow into the working chamber 1.1 via the control valve rod 8 and the separating disk 7.
When the control valve rod 8 closes the oil outlet 71, the oil return hole 72 is in an open state, at the moment, due to the centrifugal force, silicone oil in the working cavity 1.1 flows into the oil storage cavity 1.2, and the clutch is in an idle state, so that the rotating speed of the impeller is reduced, and the flow rate of cooling liquid is reduced; when the control valve rod 8 opens the oil outlet 71, the oil return hole 72 is in a closed state, and at the moment, silicone oil in the oil storage cavity 1.2 continuously flows into the working cavity 1.1, so that the rotating speed of the impeller is increased, and the flow of the cooling liquid is increased.
The split disk 7 is press-fitted with the driving disk 6 and is assembled on the three-ring bearing 12 through the hub 5 and the clutch hub bolt 4.
An oil outlet 71 and an oil return hole 72 are arranged on the separating disc 7, wherein the diameter of the oil outlet 71 is 2-4 mm, the diameter of the oil return hole is 2-3 mm, the angle between the two holes is 55-65 degrees, and the diameter of the reference circle of the two holes is 90-100 mm.
The electrically controlled solenoid 11 is used to control the action of the valve rod 8, thereby realizing the closed-loop regulation of the rotating speed of the impeller 17. The electric control solenoid 11 is assembled on the pump body rear cover 16 through three M6 solenoid mounting bolts 10, a winding of an enameled wire is arranged in the electric control solenoid 11, the winding is formed by winding a copper wire with the wire diameter of 0.355mm, the number of turns is 800-900 turns, the resistance value of the copper wire winding is 25-30 omega, the resistance value of the copper wire winding is related to the selected silicone oil water pump, and enough magnetic field force must be ensured to control the action of the valve rod 8 so as to ensure that the suction function of the control valve rod is normal. The connector of the electric control solenoid 11 adopts advanced waterproof technology, the sealing performance can reach the highest IP68 grade, the surface layer of the electric control solenoid 11 is made of nylon 66 material and 30% glass fiber material, the metal part is ordinary carbon steel, and the high temperature resistance and the strength and shock resistance of the solenoid 11 are both ensured.
The rotation speed sensor 13 is integrally assembled with the signal ring 14 and is interference-assembled on the flange shaft of the three-ring bearing 12. When the three-ring bearing 12 and the impeller 17 rotate synchronously, the rotation speed sensor 13 and the signal ring 14 can generate a pulse voltage signal as a rotation speed output by means of a hall effect, for example: when the impeller 17 rotates once, the rotation speed sensor 13 can generate 6 pulse voltage signals as output. The inside embedded PCB board design that contains of speed sensor 13 is provided with electric components such as electric capacity, freewheeling diode, resistance on the PCB board, can promote speed sensor 13's EMC ability on the one hand, and on the other hand has promoted the ability of nai whole car abnormal current. The connector of the rotating speed sensor 13 comprises three pins, the three pins correspond to the positive electrode (5V) of the power input, the ground and the signal output respectively, the rotating speed sensor 13 is additionally provided with a special fixing unit which can be used for fixing the rotating speed sensor with a clutch body so as to prevent the failure risk caused by the vibration of a wire harness, and a metal nest is arranged in a fixing round hole and used for assembly.
The signal ring 14 has a permanent magnet therein, which is classified into N, S stages, and when the magnetic stage of the signal ring 14 enters the sensitive area of the rotation speed sensor 13, the rotation speed sensor 13 will output a pulse voltage signal with alternating high and low levels as an output based on the hall effect.
In order to effectively solve the leakage problem of the cooling liquid, the water seal 15 and the pump body rear cover 16 are in interference fit, the most advanced water seal design structure of German KCAO is adopted, and a water storage ring structure is additionally added, so that the friction force of the cooling liquid is reduced, and the service life of the water seal 15 is prolonged. The diameter of a flange hole in the water seal 15 is 12-16 mm, and the flange hole can be assembled with a flange of the three-ring bearing 12.
The pump body rear cover 16 is matched with a volute at the end of an engine and an impeller 17, and the positions of water inlet and water outlet at the end of the engine need to be considered structurally, so that mismatching with the engine due to design deviation is avoided. Based on the lightweight purpose, lid 16 adopts the aluminium alloy material preparation behind the pump body, and lid 16 adopts special seal groove design behind the pump body: the angle (1-2 degrees) of the groove is increased, so that the assembly of the anisotropic sealing gasket is easy, and the sealing gasket before the assembly is prevented from falling off.
The performance of the electric control silicon oil clutch water pump depends on a key part impeller 17, and the impeller 17 and an impeller assembling bolt 18 are assembled on a flange shaft of the three-ring bearing 12 together. The impeller 17 is press-fitted on the three-ring bearing 12, and the impeller fitting bolts 18 are used for fixation to prevent axial play.
The impeller 17 of the electric control silicone oil clutch water pump is made of PPS-GF40, the diameter range is 120-135 mm, and the requirements of flow and lift of most engine platforms can be met. When the impeller 17 rotates, a negative pressure region 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, flows along the volute water channel after being centrifugally pressurized, and flows out from the volute water outlet.
In one embodiment, the impeller 17 is a "closed" impeller, and compared with a traditional "open" impeller or "semi-open" impeller, the flow rate, the lift and the working efficiency of the water pump are improved.
As shown in fig. 11 to 18, in the present embodiment, the impeller 17 includes a front cover plate 171, a rear cover plate 172, and a plurality of blades 173 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 fig. 15-18, the blade 173 includes a suction surface 1733, a water inlet edge 1731, a pressure surface 1734 and a water outlet edge 1732, the blade inclination angle β 1 between the pressure surface 1734 and the water inlet edge 1731 is 18 ° to 25 °, and the blade inclination angle β 2 between the suction surface 1733 and the water inlet edge 1731 is 20 ° to 30 ° (as shown in the following table, β 1 is 18 ° to 25 °, β 2 is 20 ° to 30 °, and the water pump performance is optimal).
In one embodiment, the impeller hub 1721 is formed of a unique hexagonal outer shape and is made of alloy steel with a diameter of 27-30 mm. The design can strengthen the strength of the hub to resist the impact of the cooling liquid on the impeller hub 1721, and prolong the service life of the impeller hub 1721; the viscous force of injection molding can be improved, the impeller hub 1721 is better combined with the blades 173, and the phenomenon that the impeller shakes and even falls off when rotating at high speed is prevented.
The edge of the impeller hub 1721 is evenly distributed with pressure balances 1722, and the pressure balances 1722 are arranged on the rear cover plate 172 and used for balancing the pressure difference on two sides of the rear 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 reference circle diameter of the pressure balance hole 1722 needs to be obtained by combining the distribution rule of cooling hydraulic pressure in specific use, and the diameter of the pressure balance hole 1722 needs to be obtained by FEA simulation to obtain an optimal solution.
In an embodiment, a circular water inlet 1711 is formed in the middle of the front cover plate 171, the diameter of the water inlet 1711 is the same as that of the volute inlet, when the impeller 17 rotates, cooling liquid can enter through the volute inlet 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 is in a segmented step design and comprises a convex 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; the front end face of the front cover plate 171 is provided with a unique inclination angle design, and the inclination angle is consistent with that of the matching volute, so that the matching clearance uniformity of the front cover plate 171 and the volute can be ensured; the back end face of the front cover plate 171 is inclined and parallel to the front end face of the front cover plate 171, friction force between the front cover plate 171 and cooling liquid flowing can be reduced by an inclined structure, the cooling liquid can move conveniently, and the thickness of the whole front cover plate 171 is 2-3 mm and is very light and thin.
In this embodiment, a plurality of blades 173 are arranged on the back cover plate 172, channels between adjacent blades 173 are flow guide channels, and the thickness of the whole back cover plate 172 is 2-3 mm, which is very light and thin.
In the 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 cooling liquid to flow out of the volute outlet along the flow guide channel, the blades 173 are arranged in a central symmetry mode in consideration of the flowing stability of the cooling liquid, and the number of the blades 173 is 6-8; the thickness of the blade 173 is variable, the thickness of the water inlet edge 1731 and the water outlet edge 1732 is 2mm, which facilitates the outlet of the cooling liquid, and the main point of action of the cooling liquid is in the middle of the blade 173, where the thickness is about 2.5 mm. The height range of the blade 173 is 13-18 mm, and the boundary of the blade 173 comprises 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 is designed as a unique arc surface and is in 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, the pressure surface 1734 is a working surface of the impeller and receives a higher pressure, the suction surface 1733 and the pressure surface 1734 both adopt a planar design conforming to fluid mechanics to reduce friction generated when the cooling fluid flows, and the water outlet edge 1732 also adopts an arc design to accelerate the outflow of the cooling fluid.
As shown in figure 20, the invention acquires relevant signals through an engine ECU and inputs the signals to carry out stepless speed regulation on the actual speed of the impeller 17 of the electric control silicon oil clutch water pump, and inputs PWM (pulse width modulation) values of the electric control silicon oil clutch water pump through the ECU to carry out speed control on the impeller 17. The actual output rotating speed of the impeller 17 is collected by the rotating speed sensor 13 and the signal ring 14 and is transmitted to an engine ECU system, and the compensation PWM value calculated by PID gain is output to perform stepless speed regulation on the rotating speed of the electric control silicon oil water pump impeller again after the difference comparison is performed between the rotating speed of the impeller required by the water pump flow required by the engine at the present time and the actual rotating speed, so that a closed-loop control system is formed. The greater the engine load, the more coolant is required to prevent overheating of the engine cylinders and of the egr cooler, which is mostly environment-dependent, and the setting of the impeller speed requires periodic collection of the load signal of the engine. More cooling liquid is needed before a silicone oil fan of the engine is meshed, then a needed signal is transmitted to an ECU system for signal collection, the needed signal is used as the input of a silicone oil clutch pump through the above-mentioned requirement, the impeller speed of the silicone oil clutch pump is adjusted under different stage requirements, the risk that the service lives of other parts are low due to long-time operation of the impeller is reduced, and meanwhile the effect of reducing the power consumption of the engine is achieved.
When the water pump of the electric control silicon oil clutch controls the magnetic coil to receive the PWM signal output by the ECU control unit of the engine, magnetic lines of force are formed, the valve rod 8 is controlled to perform opening/closing action under the magnetic force of the cut magnetic lines of force, and the silicon oil amount of the working cavity in the silicon oil clutch is adjusted in the mode. The oil storage cavity 1.2 of the silicone oil clutch is formed by enclosing a belt pulley 9 and a separating disc 7, when the engine load is low and sufficient cooling liquid is not needed, the silicone oil of the electric control silicone oil clutch can be in the oil storage cavity 1.2, when the engine ECU acquires relevant input information and does not need the impeller of the water pump of the clutch to run at high speed, the PWM value is controlled to be 100% at high level, and the rotating speed of the water pump of the electric control silicone oil clutch is less than 1000 rpm. Because the silicone oil volume in the working chamber 1.1 reduces and reaches in the oil storage chamber 1.2, water pump impeller 17 rotational speed is in the idle state, reduces vibrations, reduces engine power consumption simultaneously. When the ECU acquires relevant input information and the water pump impeller needs to run at a high speed, the ECU inputs PWM (pulse width modulation) to be 0 low level, the control valve rod 8 opens the oil outlet hole 71 (silicone oil in the oil storage cavity 1.2 gradually flows into the working cavity 1.1), and the clutch water pump is meshed and outputs a high rotating speed.
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 surroundings. The ECU can regularly acquire the input signals and send different PWM signals to the electric control silicon oil pump based on an internal algorithm under different stage requirements so as to adjust the rotating speed of the impeller 17, reduce the damage to the service life of other parts caused by the long-time running of the impeller 17 and play a role in reducing the power consumption of the engine.
When the electronic control silicone oil pump receives a PWM signal output by an ECU (electronic control Unit) of the engine, a magnetic field is formed inside the electronic control silicone oil pump, an internal control valve rod can be opened or closed under the action of magnetic force to adjust the amount of silicone oil in a working cavity in the electronic control silicone oil pump, the rotating speed of the impeller 17 is adjusted by means of viscous force of the silicone oil, the rotating speed of the impeller 17 is closer to the rotating speed of the engine when the amount of the silicone oil is larger, and the rotating speed of the impeller 17 is lower when the amount of the silicone oil is smaller. 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 a working cavity in the electric control silicone oil pump is very little, the rotating speed of the impeller 17 is less than 1000rpm, the impeller 17 is in an idle state, the vibration is reduced, and meanwhile, the power consumption of the engine is reduced; when the ECU acquires relevant input information and requires the impeller 17 to operate at a high speed, the ECU inputs PWM (pulse width modulation) to be 0 low level, at the moment, the silicone oil can continuously flow into a working cavity in the electric control silicone oil water pump, the electric control silicone oil water pump can enter a meshing state, and the impeller 17 can output a high rotating 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 in the electric control silicon oil pump based on Hall effect, the ECU can perform PID adjustment according to the deviation value of the current target rotating speed and the fed-back actual rotating speed, calculate a PWM value needing compensation, update the target rotating speed, transmit the target rotating speed to the electric control silicon oil pump again, continuously adjust the rotating speed of the impeller 17, realize stepless speed regulation, and finally the trace rotating speed of the impeller 17 approaches the target rotating speed quickly.
The electric control silicone oil pump is driven by connecting a belt pulley with an engine crankshaft, and a driving source comes from the rotating speed of the engine. The inner working effective structure of the electric control silicon oil water pump is divided into a working cavity 1.1 and an oil storage cavity 1.2, the rotating speed of the impeller can be improved after the working cavity of the electric control silicon oil water pump is filled with silicon oil, and once silicon oil in the working cavity flows back to the oil storage cavity, the rotating speed of the impeller is reduced.
The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides an automatically controlled silicon oil clutch water pump which characterized in that: comprises a silicone oil clutch front cover, a hub, a driving disc, a separating disc, a control valve rod, a belt pulley, a three-ring bearing, an electric control solenoid, a rotating speed sensor, a signal ring, a pump body rear cover and an impeller,
the silicone oil clutch front cover is fixedly connected with a belt pulley, and the belt pulley is connected with an engine crankshaft; the three-ring bearing comprises a central shaft, an inner bearing and an outer bearing, wherein the inner bearing is sleeved on the central shaft, and the outer bearing is sleeved on the inner bearing;
a driving disc, a separating disc and a control valve rod are arranged between the silicone oil clutch front cover and the belt pulley, the front end of the central shaft sequentially penetrates through the control valve rod, the separating disc and the driving disc and then extends into the silicone oil clutch front cover, a wheel hub is arranged at the front end of the central shaft, the separating disc and the driving disc are fixed through press fitting, the driving disc is fixedly connected with the wheel hub, and the control valve rod is arranged between the separating disc and the belt pulley;
the rear end face of the front cover of the silicone oil clutch and the front end face of the driving disc are provided with annular working teeth which are matched with each other, and a gap formed between the annular working teeth which are meshed with each other forms a working cavity for flowing of silicone oil; the front end surface of the belt pulley is provided with an annular groove, and the annular groove and the rear end surface of the separating disc form an oil storage cavity; the separating disc is provided with an oil outlet and an oil return hole which are communicated with the oil storage cavity and the working cavity, and the control valve rod is provided with valves respectively matched with the oil outlet and the oil return hole;
the belt pulley is tightly matched and arranged on the inner bearing, the pump body rear cover is tightly matched and arranged on the outer bearing, an electric control solenoid is arranged between the belt pulley and the pump body rear cover, the electric control solenoid is fixedly connected with the pump body rear cover, and the electric control solenoid controls the action of the control valve rod, so that the on-off of the oil outlet and the oil return hole is controlled, and the amount of silicon oil in the working cavity is adjusted;
the rear end of the central shaft is sequentially provided with a rotation speed sensor, a signal ring and an impeller, the impeller and the central shaft rotate synchronously, and the rotation speed sensor and the signal ring are integrally assembled and used for collecting the rotation speed of the impeller.
2. The electronically controlled silicone oil clutch water pump of claim 1, wherein: the impeller comprises a front cover plate, a rear cover plate and blades of the silicone oil clutch, and 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 of the silicone oil clutch; the middle part of the rear cover plate is provided with an impeller hub, and the middle part of the front cover plate of the silicone oil clutch is provided with a water inlet; the blade comprises a suction surface, a water inlet edge, a pressure surface and a water outlet edge, wherein the blade inclination angle beta 1 between the pressure surface and the water inlet edge is 18-25 degrees, and the blade inclination angle beta 2 between the suction surface and the water inlet edge is 20-30 degrees.
3. The electronically controlled silicone oil clutch water pump of claim 1, wherein: when the load of the engine is low and sufficient cooling liquid is not needed, the electric control solenoid receives a PWM signal output by an ECU (electronic control Unit) of the engine, the electric control solenoid controls the action of the control valve rod, the oil outlet is closed, and the oil return hole is opened; the silicone oil in the working cavity flows to the oil storage cavity, the shearing force between the rear end face of the front cover of the silicone oil clutch and the working teeth on the front end face of the driving disc is reduced, and the impeller gradually enters idle rotation; the rotating speed of the water pump of the electric control silicon oil clutch is less than 1000 rpm.
4. The electronically controlled silicone oil clutch water pump of claim 1, wherein: when the load of the engine is increased and enough cooling liquid is needed, the electric control solenoid receives a PWM signal output by an ECU control unit of the engine, the electric control solenoid controls the action of the control valve rod, the oil outlet is gradually opened, and the oil return hole is gradually closed; the silicone oil in the oil storage cavity flows to the working cavity, the shearing force between the rear end face of the front cover of the silicone oil clutch and the working teeth on the front end face of the driving disc is increased, and the rotating speed of the impeller gradually tends to be consistent with that of the belt pulley.
5. The electronically controlled silicone oil clutch water pump of claim 1, wherein: the engine ECU compares the impeller rotating speed required by the water pump flow required by the engine in the current period with the actual rotating speed, and then outputs a compensation PWM value calculated by PID gain to carry out stepless speed regulation on the rotating speed of the electric control silicon oil water pump impeller again, thereby forming a closed-loop control system.
6. The electronically controlled silicone oil clutch water pump of claim 1, wherein: the silicone oil clutch front cover is assembled and fixed with the belt pulley through the bolts, the design height of the radiating fins on the silicone oil clutch front cover is 15-25 mm, the height of working teeth on the silicone oil clutch front cover is 4-6 mm, the width of the working teeth is 0.5-1.2 mm, the tooth distribution diameter is 50-90 mm, and the number of teeth is 4-7.
7. The electronically controlled silicone oil clutch water pump of claim 1, wherein: the diameter range of the driving disc is 80-100 mm, the fit radial clearance between the working teeth on the driving disc and the working teeth on the front cover of the silicone oil clutch is 0.3-0.4 mm, and the axial clearance is 0.5-0.7 mm; the height of the working teeth on the driving disc is 4-6 mm, the tooth width is 0.5-1.2 mm, and the diameter range is 50-90 mm.
8. The electronically controlled silicone oil clutch water pump of claim 1, wherein: the belt pulley comprises an outer shell and a built-in stainless steel sleeve with a magnetic isolation function, the separating disc is fixedly clamped on the front end face of the belt pulley, and the built-in stainless steel sleeve is connected with the outer shell through laser welding; the number of teeth of belt teeth on the outer shell is 7-12, and the diameter range of the belt teeth is 110-140 mm; the outer diameter of the built-in stainless steel sleeve is 70-90 mm, and the inner diameter of the built-in stainless steel sleeve is 60-70 mm.
9. The electronically controlled silicone oil clutch water pump of claim 1, wherein: the structure of oil storage chamber is cyclic annular concave body, and the outer lane diameter is 95 ~ 98mm, and the inner circle diameter is 80 ~ 87mm, and the groove depth has 8 ~ 9 mm.
10. The electronically controlled silicone oil clutch water pump of claim 1, wherein: the diameter of the oil outlet is 2-4 mm, the diameter of the oil return hole is 2-3 mm, the angle between the two holes is 55-65 degrees, and the diameter of the reference circle of the two holes is 90-100 mm.
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| CN115013137A (en) * | 2022-08-01 | 2022-09-06 | 龙口中宇热管理***科技有限公司 | Electric control silicon oil speed regulation water pump |
| CN115750062A (en) * | 2022-11-23 | 2023-03-07 | 无锡惠山泵业有限公司 | Clutch water pump |
| CN116066484A (en) * | 2023-03-13 | 2023-05-05 | 龙口中宇热管理***科技有限公司 | Automobile-used automatically controlled silicon oil speed governing water pump and vehicle |
| CN117134545A (en) * | 2023-10-27 | 2023-11-28 | 厚华(天津)动力科技有限公司 | Efficient heat dissipation hub motor |
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| CN114412629B (en) | 2023-10-10 |
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