Electronic water pump for vehicle

Abstract

The utility model relates to automobile parts, in particular to an electronic water pump for an automobile. An electronic water pump for a vehicle comprises a waterproof chamber assembly and a volute, a crankshaft is arranged in the center of the waterproof chamber assembly, an impeller bearing is arranged in the middle of an impeller assembly, the impeller assembly is installed in the waterproof chamber assembly, the crankshaft is sleeved with the impeller bearing, a thrust washer is arranged on the surface of the impeller bearing, the volute is arranged on the waterproof chamber assembly, and a pipe a is arranged in the middle of the volute. A pressing piece used for fixing a thrust washer is arranged on the inner wall of the lower portion of the pipe fitting a, a pipe fitting b is arranged on the outer wall of the volute, an arc-shaped channel is formed in the inner wall of the volute and communicated with the pipe fitting b, a stator assembly is arranged at the bottom of the waterproof chamber assembly, the volute, the waterproof chamber assembly and the main shell are fixed through a screw a, and a connector assembly is arranged at the bottom of the stator assembly. The beneficial effects of the utility model are that the nine-slot motor design is adopted, the starting torque is small, the starting current is less than 4A, no current peak exists, the current is low, and the impact on loading is low; and the connector is designed in a split manner, so that multiple purposes can be realized.

Description

Technical Field

[0001] The utility model relates to auto parts, in particular to an automotive electronic water pump. Background Art

[0002] On the market, the self-weight of the water pump is relatively large, increasing the energy consumption of the vehicle. Most water pumps are constant-speed water pumps, and the changes in flow and head in the early stage are small and cannot be accurately controlled. The starting current of the water pump is too large, which may risk burning the vehicle fuse. The water pump connector is of an integrated design and cannot be used for multiple purposes. Most electronic water pumps adopt a constant-speed control logic, and the changes in flow and head in the early stage are relatively slow, making it impossible to achieve accurate control. The starting current of the 6-slot motor design is about 10A or more, which has a great impact on the vehicle's insurance. The integrated connector design requires significant changes when matching new vehicle models. Summary of the Invention

[0003] In order to solve the above technical problem of having a great impact on the vehicle's insurance, the utility model provides an automotive electronic water pump.

[0004] The technical solution of the utility model is as follows:

[0005] An automotive electronic water pump includes a water isolation chamber assembly and a volute. A machine shaft is provided at the center of the water isolation chamber assembly. An impeller bearing is provided in the middle of the impeller assembly. The impeller assembly is installed in the water isolation chamber assembly. The impeller bearing is sleeved on the machine shaft. A thrust washer is provided on the surface of the impeller bearing. A volute is provided on the water isolation chamber assembly. A pipe fitting a is provided in the middle of the volute. A pressing part for fixing the thrust washer is provided on the inner wall of the lower part of the pipe fitting a. A pipe fitting b is provided on the outer wall of the volute. An arc-shaped channel is provided on the inner wall of the volute and is communicated with the pipe fitting b. A stator assembly is provided at the bottom of the water isolation chamber assembly. The volute, the water isolation chamber assembly and the main housing are fixed by screw a. A connector assembly is provided at the bottom of the stator assembly. Plug posts and piercing terminals are annularly provided at the bottom of the connector assembly. The plug posts are inserted into the main housing. A circuit board is provided at the bottom of the main housing. The piercing terminals are inserted into the circuit board socket. An opening is provided on the side wall at the bottom of the main housing. A detachable connector is provided at the opening and is connected to the circuit board. The bottom of the main housing is sealed by a rear cover.

[0006] A chamber is provided in the middle of the water isolation chamber assembly. An arc-shaped wall body is formed on the inner wall of the water isolation chamber assembly. A step is provided on the outer wall, and a volute sealing ring is provided on the step. Protrusions a and mounting holes are provided at the edge of the water isolation chamber assembly.

[0007] The thrust washer is a ring body, and three elastic pieces are provided on the ring body. The bottom surface of the pressing part is smooth, and three notches are provided on the pressing part, and the notches press the elastic pieces.

[0008] The stator assembly includes a stator upper bracket, a nine-slot motor frame a is provided on the inner wall of the stator upper bracket, the inner side of the nine-slot motor frame a is arc-shaped, the stator upper bracket is sleeved on the lower outer wall of the watertight chamber assembly, the lower part of the watertight chamber assembly is a cylinder, the outer wall of the cylinder extends outward to form a separator, and the nine-slot motor frame a is accommodated between the separators, a notch is provided on the outer ring of the stator upper bracket, the notch is stuck on the separator, a stator lower bracket is provided below the stator upper bracket, a nine-slot motor frame b is provided on the inner side of the stator lower bracket, the nine-slot motor frame a and the nine-slot motor frame b are fitted together up and down, and the nine-slot motor frame a and the nine-slot motor frame b are sleeved with coils.

[0009] A main shell sealing ring is provided at the connection between the watertight chamber assembly and the main shell, a connector sealing ring is provided at the connection between the main shell and the rear cover, and the main shell and the rear cover are fixed by screws b.

[0010] The impeller assembly includes an impeller upper cover plate and an impeller lower plastic part. An impeller bearing is vertically arranged in the middle of the impeller upper cover plate. Plug holes are evenly arranged on the edge of the impeller upper cover plate. A channel for accommodating the impeller bearing is arranged in the middle of the impeller lower plastic part. A plug column is arranged on the surface of the impeller lower plastic part, and the plug column is inserted into the plug hole. An impeller magnetic ring is arranged at the lower part of the impeller lower plastic part. The outer wall of the impeller magnetic ring is concave and wrapped with a plastic-coated structure of the magnetic ring. The impeller magnetic ring is a molded nebium iron boron magnetic ring.

[0011] A recessed opening is arranged in the middle of the impeller bearing.

[0012] The inner wall of the impeller lower plastic part is provided with a protrusion b for clamping the recessed opening.

[0013] A wrapping piece is provided at the lower part of the impeller lower body plastic piece, the cross section of the wrapping piece is I-shaped, a clamping block is provided at the connection of the inner wall of the wrapping piece, and an impeller magnetic ring is provided on the wrapping piece.

[0014] The technical solution of the utility model has a novel structure, ingenious and simple design, and adopts a molded NdFeB plastic-coated impeller design (new material, new process). The weight is 25% lower than that of similar products on the market, and it is a lightweight and low-carbon design; a constant power water pump is adopted, and the water pump flow and head change linearly, which can realize precise flow control; a 9-slot motor design has a small starting torque, a starting current of less than 4A, no current spikes, low current, and low impact on loading; the split design of the connector can enable one machine to have multiple uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 , 2 It is a structural schematic diagram of the utility model;

[0016] Figure 3 yes Figure 2 Schematic diagram of the structure in the AA section;

[0017] Figure 4 It is a schematic diagram of the structure of the utility model in the explosion state;

[0018] Figure 5 、 6 is a schematic structural view of the volute of the present utility model;

[0019] Figure 7 、 8 is a schematic structural view of the main housing of the present utility model;

[0020] Figure 9 、 10 、11、17 are schematic structural views of parts of the present utility model;

[0021] Figure 12 、 16 is a schematic structural view of the connector assembly of the present utility model;

[0022] Figure 13 is a schematic structural view of the stator assembly of the present utility model;

[0023] Figure 14 is a schematic structural view of the upper stator bracket of the present utility model;

[0024] Figure 15 is a schematic structural view of the lower stator bracket of the present utility model;

[0025] Figure 18 is a schematic structural view of the water isolation chamber assembly of the present utility model;

[0026] Figure 19 、 21 is a schematic structural view of the impeller assembly of the present utility model;

[0027] Figure 20 is Figure 19 a schematic structural view of the CC-direction cross-section;

[0028] Figure 22 is a schematic structural view of the impeller magnetic ring of the present utility model. Detailed implementation manners

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. Embodiment

[0030] As Figure 1 、 2, a vehicle electronic water pump shown in 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, includes a water isolation chamber assembly 1 and a volute 9. The volute is made of PPS material, connected to the vehicle's inlet and outlet water pipes, and forms a hydraulic structure with the impeller. A machine shaft 41 is provided at the center of the water isolation chamber assembly 1. An impeller bearing 32 is provided in the middle of the impeller assembly 11. The impeller assembly 11 is installed in the water isolation chamber assembly 1. The impeller bearing 32 is sleeved on the machine shaft 14. A thrust washer 10 is provided on the surface of the impeller bearing 32. The thrust washer is made of metal to prevent the impeller bearing from wearing the volute structure. The material of the water isolation chamber assembly includes metal + PPS material. The machine shaft guides the movement of the impeller. The water isolation chamber separates the dry chamber and the wet chamber of the water pump. A volute 9 is provided on the water isolation chamber assembly 1. A pipe fitting a 20 is provided in the middle of the volute 9. A pressing part 18 for fixing the thrust washer 10 is provided on the inner wall of the lower part of the pipe fitting a 20. A pipe fitting b 19 is provided on the outer wall of the volute 9. An arc-shaped channel is provided on the inner wall of the volute 9, and the arc-shaped channel communicates with the pipe fitting b 19. A stator assembly 2 is provided at the bottom of the water isolation chamber assembly 1. The volute 9, the water isolation chamber assembly 1 and the main housing 14 are fixed by screws a 7. The main housing 14 is made of PA66 material to support and install each component of the water pump. A connector assembly 5 is provided at the bottom of the stator assembly 2. Plug posts and piercing terminals 4 are provided in a ring at the bottom of the connector assembly 5. The plug posts are inserted into the main housing 14. A circuit board 28 is provided at the bottom of the main housing 14. The piercing terminals 4 are inserted into the sockets of the circuit board 28. An opening is provided on the side wall at the bottom of the main housing 14. A detachable connector is provided at the opening, and the detachable connector is connected to the circuit board 28. The bottom of the main housing 14 is sealed by a rear cover 8.

[0031] A chamber is provided in the middle of the water isolation chamber assembly 1. An arc-shaped wall body is formed on the inner wall of the water isolation chamber assembly 1. A step 17 is provided on the outer wall, and a volute sealing ring 12 is provided on the step 17. Protrusions a 15 and mounting holes 16 are provided at the edge of the water isolation chamber assembly 1.

[0032] The thrust washer 10 is a ring body. Three elastic pieces are provided on the ring body. The bottom surface of the pressing part 18 is smooth. Three notches are provided on the pressing part 18, and the notches press the elastic pieces.

[0033] The stator assembly 2 includes a stator upper bracket 22. Nine-slot motor brackets a 21 are provided on the inner wall of the stator upper bracket 22. The inner side of the nine-slot motor brackets a 21 is arc-shaped. The stator upper bracket 22 is sleeved on the outer wall of the lower part of the water isolation chamber assembly 1. The lower part of the water isolation chamber assembly 1 is a cylinder. A partition is formed by outward extension of the outer wall of the cylinder. The nine-slot motor brackets a 21 are accommodated between the partitions. A notch 23 is provided on the outer circle of the stator upper bracket 22, and the notch 23 is stuck on the partition. A stator lower bracket 24 is provided below the stator upper bracket 22. Nine-slot motor brackets b 25 are provided on the inner side of the stator lower bracket 24. The nine-slot motor brackets a 21 and the nine-slot motor brackets b 25 are attached to each other up and down. Coils are sleeved on the nine-slot motor brackets a 21 and the nine-slot motor brackets b 25. The stator assembly 2 is a motor winding, and the 9-slot design forms a power structure with the impeller magnetic ring.

[0034] A main housing seal ring 13 is provided at the connection between the water isolation chamber assembly 1 and the main housing 14, a connector seal ring 3 is provided at the connection between the main housing 14 and the rear cover 8, and the main housing 14 and the rear cover 8 are fixed by screws b. The main housing seal ring is made of EPDM, a water pump dry chamber sealing component; the connector seal ring is made of EPDM, a water pump dry chamber sealing component; the volute seal ring is made of EPDM, a water pump water chamber sealing component.

[0035] The impeller assembly 11 includes an impeller upper cover plate 31 and an impeller lower body plastic part 35. An impeller bearing 32 is vertically provided in the middle of the impeller upper cover plate 31. Insertion holes 38 are evenly provided at the edge of the impeller upper cover plate 31. A channel for accommodating the impeller bearing 32 is provided in the middle of the impeller lower body plastic part 35. Insertion posts 37 are provided on the surface of the impeller lower body plastic part 35, and the insertion posts 37 are inserted into the insertion holes 38. An impeller magnetic ring 34 is provided at the lower part of the impeller lower body plastic part 35. The outer wall of the impeller magnetic ring 34 is recessed to wrap a magnetic ring plastic coating structure 33. The outside of the impeller magnetic ring uses a PPS plastic coating structure with a plastic coating thickness of 0.5 mm, and the function is to isolate the corrosion of the coolant on the magnetic ring. The impeller magnetic ring 34 is a molded neodymium iron boron magnetic ring. The impeller assembly: a combination of an impeller and a magnetic ring, in which the impeller part and the volute form a hydraulic structure, and the magnetic ring and the stator assembly form an electric motor structure to provide power for the water pump.

[0036] A recessed opening 36 is provided in the middle of the impeller bearing 32.

[0037] A convex block b39 for clamping the recessed opening 36 is provided on the inner wall of the impeller lower body plastic part 35.

[0038] A wrapping part is provided at the lower part of the impeller lower body plastic part 35. The cross section of the wrapping part is in an I shape. A clamping block 40 is provided at the connection of the inner wall of the wrapping part, and the impeller magnetic ring 34 is provided on the wrapping part.

[0039] During use, the bracket 6 is made of EPDM, and is fixedly installed on the vehicle end for the water pump assembly. The circuit board 28 is a PCBA, the water pump controller. The rear cover 8 is made of PA66 to protect the water pump controller. The piercing terminal is used to connect the stator assembly and the PCBA, and the connector assembly is used to connect with the vehicle signal PCBA. The electronic water pump is divided into two parts, a water chamber and a dry chamber, by the water isolation chamber assembly 1. The water chamber part consists of a volute, a volute seal ring, an impeller assembly, a thrust washer and a water isolation chamber assembly. It is characterized in that the seal between the volute and the water isolation chamber assembly is carried out by radial seal, which has a better sealing effect than the pressing-down type seal ring structure and has lower requirements for the position of the seal ring. Another feature is that the impeller magnetic ring 34 is formed by molding neodymium iron boron and rubber material, and its magnetization intensity is 2500GS. In addition, there is a PPS plastic coating structure outside the impeller magnetic ring to protect the neodymium iron boron material from being eroded by the coolant. The dry chamber part is the electronic control and motor part of the electronic water pump, which consists of a main housing, a stator assembly, a PCBA, a piercing terminal, a grounding terminal, a connector assembly, a main housing seal ring and a rear cover, etc. It is characterized in that the stator assembly adopts a 9-slot design, the starting torque required by the motor is small, and the starting current is less than 4A when it is 80W. Another feature is that the connector assembly is of a split structure and can be replaced for different male terminals. Another feature is that the connection with the stator assembly uses a piercing terminal to pierce the insulation layer of the enameled wire, which saves processes compared with resistance welding. The other end of the piercing terminal is a fish-eye terminal. The electronic water pump is connected to the vehicle signal through the controller, receives vehicle instructions to start, stop, speed up and other working instructions for the electronic water pump. The controller monitors the working state of the electronic water pump to determine whether the water pump is working abnormally and reports the water pump failure through the signal line. The stator assembly of the electronic water pump and the impeller magnetic ring part form a motor structure to make the impeller of the impeller water pump rotate at a high speed to generate centrifugal force. The coolant enters the water passing surface of the impeller from the water inlet, pressurizes the liquid through the centrifugal force and guides the coolant out through the volute to realize the function of transporting the coolant. The water pump characteristic curve is shown in Table 1.

[0040] Table 1

[0041]

[0042] It should be understood that the above are only the preferred embodiments of the present invention, and are not sufficient to limit the technical solutions of the present invention. For those of ordinary skill in the art, within the spirit and principles of the present invention, additions, substitutions, transformations or improvements can be made according to the above description, and all these technical solutions after the above additions, substitutions, transformations or improvements should fall within the protection scope of the appended claims of the present invention.

Claims

1. An electronic water pump for a vehicle, comprising a water-isolating chamber assembly (1) and a volute (9), characterized in that: The watertight chamber assembly (1) is provided with a machine shaft (41) at the center, an impeller bearing (32) is provided in the middle of the impeller assembly (11), the impeller assembly (11) is installed in the watertight chamber assembly (1), the impeller bearing (32) is sleeved on the machine shaft (41), a thrust washer (10) is provided on the surface of the impeller bearing (32), a volute (9) is provided on the watertight chamber assembly (1), a pipe a (20) is provided in the middle of the volute (9), a pressing piece (18) for fixing the thrust washer (10) is provided on the inner wall of the lower part of the pipe a (20), a pipe b (19) is provided on the outer wall of the volute (9), an arc-shaped channel is provided on the inner wall of the volute (9), and the arc-shaped channel and the pipe b (19) are connected to each other. ) are connected, a stator assembly (2) is provided at the bottom of the watertight chamber assembly (1), the volute (9), the watertight chamber assembly (1) and the main housing (14) are fixed by screws a (7), a connector assembly (5) is provided at the bottom of the stator assembly (2), a plug post and a piercing terminal (4) are provided at the bottom ring of the connector assembly (5), the plug post is inserted into the main housing (14), a circuit board (28) is provided at the bottom of the main housing (14), the piercing terminal (4) is inserted into the socket of the circuit board (28), an opening is provided at the bottom side wall of the main housing (14), a detachable connector is provided at the opening, the detachable connector is connected to the circuit board (28), and the bottom of the main housing (14) is sealed by a rear cover (8).

2. The vehicle electronic water pump according to claim 1, characterized in that: The watertight chamber assembly (1) has a chamber in the middle, the inner wall of the watertight chamber assembly (1) forms an arc-shaped wall, the outer wall is provided with a step (17), a volute sealing ring (12) is provided on the step (17), and the edge of the watertight chamber assembly (1) is provided with a protrusion a (15) and a mounting hole (16).

3. The vehicle electronic water pump according to claim 1, characterized in that: The thrust washer (10) is a ring body, on which three spring pieces are arranged. The bottom surface of the pressing piece (18) is smooth, and the pressing piece (18) is provided with three notches, which press the spring pieces.

4. The vehicle electronic water pump according to claim 1, characterized in that: The stator assembly (2) comprises a stator upper bracket (22), the inner wall of the stator upper bracket (22) is provided with a nine-slot motor frame a (21), the inner side of the nine-slot motor frame a (21) is in an arc shape, the stator upper bracket (22) is sleeved on the outer wall of the lower part of the water-proof chamber assembly (1), the lower part of the water-proof chamber assembly (1) is in the form of a cylinder, the outer wall of the cylinder extends outward to form a separator, the nine-slot motor frame a (21) is accommodated between the separators, the outer ring of the stator upper bracket (22) is provided with a notch (23), the notch (23) is stuck on the separator, the stator lower bracket (24) is provided below the stator upper bracket (22), the inner side of the stator lower bracket (24) is provided with a nine-slot motor frame b (25), the nine-slot motor frame a (21) and the nine-slot motor frame b (25) are fitted up and down, and the nine-slot motor frame a (21) and the nine-slot motor frame b (25) are sleeved with coils.

5. The vehicle electronic water pump according to claim 1, characterized in that: A main housing sealing ring (13) is provided at the connection between the watertight chamber assembly (1) and the main housing (14), a connector sealing ring (3) is provided at the connection between the main housing (14) and the rear cover (8), and the main housing (14) and the rear cover (8) are fixed by screws b.

6. The vehicle electronic water pump according to claim 1, characterized in that: The impeller assembly (11) comprises an impeller upper cover plate (31) and an impeller lower plastic part (35); an impeller bearing (32) is vertically arranged in the middle of the impeller upper cover plate (31); insertion holes (38) are evenly arranged on the edge of the impeller upper cover plate (31); a channel for accommodating the impeller bearing (32) is arranged in the middle of the impeller lower plastic part (35); a plug post (37) is arranged on the surface of the impeller lower plastic part (35); the plug post (37) is inserted into the plug hole (38); an impeller magnetic ring (34) is arranged at the bottom of the impeller lower plastic part (35); an outer wall of the impeller magnetic ring (34) is concavely wrapped with a magnetic ring plastic coating structure (33); and the impeller magnetic ring (34) is a molded nebium iron boron magnetic ring.

7. The vehicle electronic water pump according to claim 6, characterized in that: A recessed opening (36) is provided in the middle of the impeller bearing (32).

8. The vehicle electronic water pump according to claim 7, characterized in that: The inner wall of the impeller lower plastic part (35) is provided with a protrusion b (39) for clamping the recessed opening (36).

9. The vehicle electronic water pump according to claim 6, characterized in that: A wrapping piece is provided at the lower part of the impeller lower body plastic piece (35), the cross section of the wrapping piece is in an I-shape, a clamping block (40) is provided at the connection of the inner wall of the wrapping piece, and an impeller magnetic ring (34) is provided on the wrapping piece.

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