Electronic water pump structure

Abstract

The utility model relates to the technical field of liquid cooling loops of internal combustion engines of fuel vehicles, in particular to an electronic water pump structure which comprises a rubber support, a shell, a stator winding, an impeller rotor and a sealing assembly, and the sealing assembly comprises a waterproof sleeve, a waterproof sleeve sealing ring, a front cover sealing ring, a rear cover sealing ring, a protection component and a control component. The waterproof sleeve sealing ring, the front cover sealing ring, the rear cover sealing ring, the protection component and the control component are installed in the shell, the stator winding is installed in the shell, the impeller rotor is located at the front end of the stator winding, and the rear cover sealing ring is located at the rear end of the stator winding. The waterproof sleeve is located between the stator winding and the impeller rotor to play a waterproof role, and the sealing performance is improved through the front cover sealing ring and the waterproof sleeve sealing ring, so that in the using process of the water pump, liquid cannot enter the shell due to poor sealing performance, and a motor is protected against damage.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid cooling circuits of internal combustion engines of fuel vehicles, and in particular to an electronic water pump structure. Background Art

[0002] An electronic water pump is a water pump driven by electronic control technology, mainly composed of a motor unit, a flow unit and an electronic control unit. It adjusts the start and stop, flow rate, pressure and other parameters of the water pump through the electronic control unit (ECU) to achieve precise control of the coolant circulation. Compared with traditional mechanical water pumps, electronic water pumps have the advantages of energy saving, environmental protection, high stability and long service life.

[0003] Electronic water pumps are widely used in water circulation, cooling systems, and on-board water supply systems of various special vehicles such as new energy vehicles, hybrid vehicles, RVs, and buses. It can adjust the motor speed through pulse width modulation (PWM) technology according to feedback signals such as water temperature, thereby accurately controlling the flow rate, effectively saving energy and reducing carbon emissions.

[0004] However, the overall tensile strength of the existing electronic water pump is not high, and the impeller is in direct contact with water during use. During use, poor sealing may cause liquid to enter the casing, thereby causing the motor to burn out. Utility Model Content

[0005] The purpose of the utility model is to provide an electronic water pump structure, which solves the problem that the tensile strength of the existing overall structure of the electronic water pump is not high, the impeller is in direct contact with water during use, and liquid enters the casing due to poor sealing during use, thereby causing the motor to burn out.

[0006] To achieve the above-mentioned purpose, the utility model provides an electronic water pump structure, including a rubber bracket, a casing, a stator winding, an impeller rotor and a sealing assembly, wherein the casing is fixedly mounted on the rubber bracket, the stator winding is fixedly mounted in the casing, the impeller rotor is mounted in the casing, the sealing assembly includes a watertight sleeve, a watertight sleeve sealing ring, a front cover sealing ring, a rear cover sealing ring, a protective component and a control component, the watertight sleeve is fixedly mounted in the casing, the watertight sleeve sealing ring is fixedly mounted on the watertight sleeve, the front cover sealing ring is fixedly mounted on the watertight sleeve and is located on the side of the watertight sleeve away from the watertight sleeve sealing ring, the rear cover sealing ring is fixedly mounted in the casing, the protective component is mounted on the casing, and the control component is mounted on the rear cover sealing ring.

[0007] Wherein, the protective component includes a front cover and front cover self-tapping screws, the front cover is installed on the outer shell; the front cover self-tapping screws are installed on the front cover, penetrate the front cover, and are located inside the outer shell.

[0008] Wherein, the protective component also includes a positioning sleeve, which is installed on the front cover, passes through the front cover, and is located inside the rubber bracket.

[0009] Wherein, the control component includes a controller, a controller self-tapping screw and a protective component, and the controller is installed on the rear cover sealing ring; the controller self-tapping screw is installed on the controller, passes through the controller, and is located inside the rear cover sealing ring.

[0010] Wherein, the protective component includes a back cover and back cover self-tapping screws, the back cover is installed on the outer shell; the back cover self-tapping screws are installed on the back cover, penetrate the back cover, and are located inside the outer shell.

[0011] The utility model discloses an electronic water pump structure, wherein the watertight sleeve is installed in the outer shell, the watertight sleeve sealing ring is installed on the watertight sleeve, the front cover sealing ring is installed on the watertight sleeve, the impeller rotor is installed in the outer shell, and the rear cover sealing ring is installed in the outer shell. During installation, the stator winding is installed in the outer shell, the impeller rotor is located at the front end of the stator winding, and the rear cover sealing ring is located at the rear end of the stator winding to seal the rear end of the stator winding. The controller plays a control role, and the controller is installed on the rear cover sealing ring through the controller self-tapping screws. The rear cover is installed on the outer shell by the rear cover self-tapping screws to protect the controller and achieve better heat dissipation. The impeller rotor is installed in the outer shell. The watertight sleeve is located between the stator winding and the impeller rotor to play a water-proof role. The front cover sealing ring and the watertight sleeve sealing ring are used to increase the sealing performance. The front cover is installed on the outer shell by the front cover self-tapping screws to protect the impeller rotor, enhance the overall tensile strength and aging resistance, stabilize the overall performance, and play a noise reduction role. Therefore, during the use of the water pump, the liquid will not enter the outer shell due to poor sealing, thereby protecting the motor from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0013] Figure 1 It is a schematic diagram of the overall structure of the electronic water pump structure of the utility model.

[0014] Figure 2 It is a schematic diagram of the installation structure of the stator winding of the utility model.

[0015] Figure 3 It is a plan view of the impeller of the utility model.

[0016] Figure 4 It is a side view of the impeller of the utility model.

[0017] Figure 5 It is a feasibility analysis of the injection molding process of electronic water pump.

[0018] Figure 6 It is a simulation fluid analysis of electronic water pump products.

[0019] In the figure: 1-rubber bracket, 2-housing, 3-stator winding, 4-impeller rotor, 5-waterproof sleeve, 6-waterproof sleeve sealing ring, 7-front cover sealing ring, 8-rear cover sealing ring, 9-front cover, 10-front cover self-tapping screws, 11-positioning sleeve, 12-controller, 13-controller self-tapping screws, 14-rear cover, 15-rear cover self-tapping screws. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] See also Figures 1 to 4 ,in Figure 1 It is a schematic diagram of the overall structure of the electronic water pump structure of the utility model; Figure 2 It is a schematic diagram of the installation structure of the stator winding of the utility model; Figure 3 It is a plan view of the impeller of the utility model; Figure 4 It is a side view of the impeller of the utility model.

[0022] The utility model provides an electronic water pump structure, including a rubber bracket 1, a shell 2, a stator winding 3 and an impeller rotor 4, wherein the shell 2 is fixedly mounted on the rubber bracket 1, the stator winding 3 is fixedly mounted in the shell 2, and the impeller rotor 4 is mounted in the shell 2. The rubber bracket 1 is made of rubber, and the rubber bracket 1 supports the shell 2; the shell 2 is made of PPS+GF40 (glass fiber) synthetic material, which improves the drop resistance and anti-aging strength of the overall structure, so that the electronic water pump generates a smaller amplitude during operation, which plays a role in noise reduction, and the shell 2 supports the stator winding 3 and the sealing assembly; the stator winding 3 generates a rotating magnetic field, cooperates with the impeller rotor 4, realizes the conversion of electrical energy to mechanical energy, and realizes the function of water circulation; the impeller rotor 4 rotates to lead water from a low place to a high place, controls the performance indicators such as the flow rate of the electronic water pump, and makes the electronic water pump run stably.

[0023] The parameter setting of the impeller rotor 4 can be determined by a similarity conversion method:

[0024] The specific speed of the pump is as follows:

[0025]

[0026] In the above formula: n——water pump speed (r / min);

[0027] Q——water pump flow (m3 / s);

[0028] H——water pump (m);

[0029] After obtaining the specific speed of the water pump, we need to select the model pump according to the calculated specific speed in the hydraulic model and obtain the corresponding Q from it. M , D 1M , D 2M , b 1M , b 2M , β 1M , β 2M , n M .

[0030] Then find the size factor λ:

[0031]

[0032] The impeller design size can be calculated based on the actual application through the formula:

[0033] D1=λ×D 1M

[0034] D2=λ×D 2M

[0035] b1=1.2×λ×b 1M

[0036] b2=1.2×λ×b 2M

[0037] The inlet and outlet angles of the water pump are equal to the placement angle of the model pump:

[0038] β1=0.8×β 1M

[0039] β2=1.5×β 2M

[0040] D1 is the blade inlet diameter, D2 is the blade outlet diameter, blade inlet width b1, blade outlet width b2, β1 is the impeller inlet angle, and β2 is the impeller outlet angle.

[0041] Wherein, the sealing assembly includes a watertight sleeve 5, a watertight sleeve sealing ring 6, a front cover sealing ring 7, a rear cover sealing ring 8, a protective component and a control component. The watertight sleeve 5 is fixedly installed in the outer shell 2, the watertight sleeve sealing ring 6 is fixedly installed on the watertight sleeve 5, the front cover sealing ring 7 is fixedly installed on the watertight sleeve 5 and is located on the side of the watertight sleeve 5 away from the watertight sleeve sealing ring 6, the rear cover sealing ring 8 is fixedly installed in the outer shell 2, the protective component is installed on the outer shell 2, and the control component is installed on the rear cover sealing ring 8. The watertight sleeve 5 is located between the stator winding 3 and the impeller rotor 4, and plays a role of water isolation; the watertight sleeve sealing ring 6 is located on the watertight sleeve 5, close to the side of the stator winding 3, and the front cover sealing ring 7 is located on the watertight sleeve 5, close to the side where the impeller rotates. The watertight sleeve sealing ring 6 and the front cover sealing ring 7 increase the sealing performance to prevent water from entering the outer casing 2, while improving the pollution resistance of the electronic water pump and protecting the stator winding 3 from damage; the rear cover sealing ring 8 seals the rear end of the stator winding 3, and the rear cover sealing ring 8 supports the control component; the protective component protects the impeller rotor 4; the control component controls performance and other parameters to achieve precise control.

[0042] Secondly, the protective component includes a front cover 9 and a front cover self-tapping screw 10. The front cover 9 is installed on the housing 2; the front cover self-tapping screw 10 is installed on the front cover 9, penetrates the front cover 9, and is located inside the housing 2. The material of the front cover 9 is PPS+GF40 (glass fiber) synthetic material. The front cover 9 protects the impeller rotor 4. The front cover 9 is installed on the housing 2 through the front cover self-tapping screw 10 to form a detachable fixed connection device; the material of the front cover self-tapping screw 10 is stainless steel. The front cover self-tapping screw 10 fixes the front cover 9 on the housing 2, which is convenient for disassembly of the front cover 9.

[0043] Again, the protective component further includes a positioning sleeve 11, which is installed on the front cover 9, passes through the front cover 9, and is located inside the rubber bracket 1. The positioning sleeve 11 strengthens the fixation of the front cover 9, so that the front cover 9 is fixed on the rubber bracket 1.

[0044] From this, the control component includes a controller 12, a controller self-tapping screw 13 and a protective component. The controller 12 is installed on the rear cover sealing ring 8; the controller self-tapping screw 13 is installed on the controller 12, penetrates the controller 12, and is located inside the rear cover sealing ring 8. The controller 12 controls the start and stop, flow, pressure and other parameters of the water pump. The controller 12 is installed on the rear cover sealing ring 8 through the controller self-tapping screw 13; the material of the controller self-tapping screw 13 is stainless steel, and the controller self-tapping screw 13 fixes the controller 12 on the rear cover sealing ring 8.

[0045] Then, the protection component includes a back cover 14 and a back cover self-tapping screw 15. The back cover 14 is installed on the housing 2; the back cover self-tapping screw 15 is installed on the back cover 14, penetrates the back cover 14, and is located inside the housing 2. The back cover 14 is made of aluminum, which has good thermal conductivity and heat dissipation, improves heat dissipation efficiency, and protects the controller 12; the back cover self-tapping screw 15 is made of stainless steel, and the back cover self-tapping screw 15 fixes the back cover 14 on the housing 2, making it easy to disassemble the back cover 14.

[0046] When the electronic water pump structure of this embodiment is used, the stator winding 3 is installed in the housing 2, the impeller rotor 4 is located at the front end of the stator winding 3, and the rear cover sealing ring 8 is located at the rear end of the stator winding 3 to seal the rear end of the stator winding 3. The controller 12 plays a control role. The controller 12 is installed on the rear cover sealing ring 8 through the controller self-tapping screws 13, and the rear cover 14 is installed on the housing 2 through the rear cover self-tapping screws 15 to protect the controller 12 and achieve better For the purpose of heat dissipation, the impeller rotor 4 is installed in the outer casing 2, and the watertight sleeve 5 is located between the stator winding 3 and the impeller rotor 4 to play a water-proof role. The front cover sealing ring 7 and the watertight sleeve sealing ring 6 are used to increase the sealing performance. The front cover 9 is installed on the outer casing 2 by the front cover self-tapping screws 10 to protect the impeller rotor 4, enhance the overall tensile strength and aging resistance, stabilize the overall performance, and play a noise reduction role. Therefore, during the use of the water pump, the liquid will not enter the outer casing 2 due to poor sealing, thereby protecting the motor from damage.

[0047] like Figure 3 and Figure 4As described above, the blades of the impeller are designed into a volute-like structure and the inlet and outlet widths b1 and b2 of the blades are increased. This structure reduces the inlet angle β1 of the impeller and increases the outlet angle β2. The volute structure increases the curvature of the blades near the hub and the cross-sectional area of ​​the impeller, thereby increasing the contact surface of the blades with the water flow and making the impact of the water flow more concentrated on the blades near the hub, thereby reducing the impact loss of the water flow on the blades, improving the working efficiency of the impeller, and increasing the service life of the impeller.

[0048] After determining the basic parameters of the impeller, the structure of the impeller is optimized.

[0049] In the traditional electronic water pump impeller, a circle of small holes called balance holes are opened on the rear cover of the impeller to keep the annular chamber on the back of the impeller at a constant low pressure. Generally, the total area of ​​the balance holes must be 4 to 5 times larger than the gap area of ​​the sealing ring on the rear cover of the impeller. However, when the fluid in the annular chamber on the back of the impeller flows into the impeller through the balance holes, the suction state of the liquid flow at the impeller inlet is destroyed, the flow loss in the impeller is increased, and the flow efficiency and anti-cavitation performance are reduced.

[0050] Therefore, this design changes the position of the impeller balancing hole, such as Figure 3 As shown, the number of balancing holes on the rear cover is reduced by half, and the same number of balancing holes are set on the impeller hub. The diameter of the balancing holes should be smaller than the impeller inlet diameter D1, and they are evenly placed on the rear cover and the hub. This can not only balance the axial force generated by the impeller when it is working, thereby reducing the wear of the bearing end face and the thrust plate, but also improve the operating efficiency of the water pump and reduce the degree of cooling water leakage from the balancing holes.

[0051] After designing the structure of the electronic water pump, we make quick prototypes and conduct corresponding preliminary tests to determine the basic performance parameters such as voltage, current, speed, flow, head, efficiency and noise of the four major modules of mechanical hydraulics, motor electromagnetics, software control and system integration. Use UG and CATIA structural design to perform interference assembly simulation verification analysis; use CFX and PUMP fluid simulation to analyze the flow channel, head, efficiency, power, speed, torque and flow; use ANSYS and nastran structural strength simulation to analyze the stiffness, mode and fatigue of the electronic water pump; use Maxwell for electromagnetic simulation - analyze the magnetic field, current, efficiency and torque performance of the motor; use AVR Studio, Altium Designer Winter, and Multisim for circuit design - analyze circuit board layout and functional simulation. Use moldflow for mold flow feasibility analysis (such as Figure 5 and Figure 6 shown).

[0052] After analysis, it was found that the key structures and components of the electronic water pump are made of PPS+GF40 synthetic materials, aluminum, graphite, etc., including the key sealing main structure and sliding and rotating lubrication structural components of the electronic water pump, which improves the overall tensile strength, aging resistance, high temperature resistance, and rotational wear resistance of the electronic water pump, and the service life reaches 20,000 hours (about three times the 7,000 hours of traditional mechanical water pumps).

[0053] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An electronic water pump structure, comprising a rubber support, a housing, a stator winding and an impeller rotor, wherein the housing is fixedly mounted on the rubber support, the stator winding is fixedly mounted in the housing, and the impeller rotor is mounted in the housing, characterized in that: Also included is a sealing assembly; The sealing assembly includes a watertight sleeve, a watertight sleeve sealing ring, a front cover sealing ring, a rear cover sealing ring, a protective component and a control component. The watertight sleeve is fixedly installed in the outer shell, the watertight sleeve sealing ring is fixedly installed on the watertight sleeve, the front cover sealing ring is fixedly installed on the watertight sleeve and is located on the side of the watertight sleeve away from the watertight sleeve sealing ring, the rear cover sealing ring is fixedly installed in the outer shell, the protective component is installed on the outer shell, and the control component is installed on the rear cover sealing ring.

2. The electronic water pump structure according to claim 1, characterized in that: The protective component comprises a front cover and a front cover self-tapping screw, wherein the front cover is mounted on the outer shell; the front cover self-tapping screw is mounted on the front cover, penetrates the front cover, and is located inside the outer shell.

3. The electronic water pump structure according to claim 2, characterized in that: The protective component also includes a positioning sleeve, which is installed on the front cover, passes through the front cover, and is located inside the rubber bracket.

4. The electronic water pump structure according to claim 1, characterized in that: The control component includes a controller, a controller self-tapping screw and a protective component. The controller is installed on the rear cover sealing ring; the controller self-tapping screw is installed on the controller, penetrates the controller, and is located inside the rear cover sealing ring.

5. The electronic water pump structure according to claim 4, characterized in that: The protection component comprises a rear cover and rear cover self-tapping screws, wherein the rear cover is mounted on the outer shell; the rear cover self-tapping screws are mounted on the rear cover, penetrate the rear cover, and are located inside the outer shell.

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