WO2021169783A1

WO2021169783A1 - Cleaning pump

Info

Publication number: WO2021169783A1
Application number: PCT/CN2021/075830
Authority: WO
Inventors: 任艳平; 曲涛; 陈安邦; 官新辉
Original assignee: 广东德昌电机有限公司
Priority date: 2020-02-25
Filing date: 2021-02-07
Publication date: 2021-09-02
Also published as: CN115176090A

Abstract

A cleaning pump (10), comprising a motor (20) and a pump body (21) provided at one end of the motor (20) and driven by the motor (20), and further comprising a mechanical seal structure (51) provided between the motor (20) and the pump body (21). The mechanical seal structure (51) is used for preventing liquid in the pump body (21) from entering the motor (20). The mechanical seal structure (51) comprises a static friction ring assembly (53) and a dynamic friction ring assembly (57) arranged opposite to each other in the axial direction. The dynamic friction ring assembly (57) is driven by a rotating shaft (580) of the motor (20) to rotate with respect to the static friction ring assembly (53).

Description

Cleaning the pump

Technical field

The invention relates to a pump for vehicles, in particular to a washing pump for vehicles.

Background technique

Existing vehicle cleaning systems usually use cleaning pumps to generate high-pressure water spray to clean the windows, headlights, and optical sensors (such as cameras, radars, and lidars). However, the existing cleaning pumps prevent liquid from entering the motor. At this time, the sleeve structure is usually used for isolation and sealing in a static sealing manner. The cleaning pump of this structure not only has poor sealing reliability, but also has a small motor power density and a large pump volume.

technical problem

In view of this, the present invention aims to provide a washing pump for vehicles that can solve the above-mentioned problems.

Technical solutions

To this end, one aspect of the present invention provides a washing pump for a vehicle, including a motor and a pump body arranged at one end of the motor and driven by the motor, and is characterized in that it also includes a pump body arranged between the motor and the pump body. The mechanical seal structure is used to prevent the liquid in the pump body from entering the motor. The mechanical seal structure includes a static friction ring assembly and a dynamic friction ring assembly arranged oppositely in the axial direction. The ring assembly is driven by the rotating shaft of the motor so as to be able to rotate relative to the static friction ring assembly.

In some embodiments, the static friction ring assembly is closer to the pump body than the dynamic friction ring assembly and is sealed and fixedly connected to the pump body. A pump cavity is formed in the pump body, and a pump cavity is formed in the mechanical seal structure. A liquid cavity, the liquid cavity is in communication with the pump cavity.

In some embodiments, the static friction ring assembly is closer to the motor than the dynamic friction ring assembly and is sealed and fixedly connected to the end of the motor, a pump cavity is formed in the pump body, and the mechanical seal structure, The end of the motor and the pump body are jointly enclosed to form a liquid cavity, and the liquid cavity is in communication with the pump cavity.

In some embodiments, the pump body includes a pump housing, and a base enclosing the pump housing together to form the pump cavity, and a drain connecting the pump cavity and the liquid cavity is formed on the base. Stomata.

In some embodiments, the static friction ring assembly includes a static friction ring and a first seal ring that is sealed and fixedly connected to the static friction ring.

In some embodiments, the static friction ring has a ring shape and is made of ceramic or silicon carbide.

In some embodiments, the first sealing ring is made of ceramic or silicon carbide, and includes a ring-shaped substrate and a side wall extending perpendicularly from the outer periphery of the substrate.

In some embodiments, the dynamic friction ring assembly includes a dynamic friction ring, a second seal ring sealingly connecting the dynamic friction ring and the rotating shaft, and is used to compress the dynamic friction ring so that the dynamic friction ring and the static friction ring assembly abut against each other. A top spring seat and a spacer used to press against the spring seat and fixedly connected with the rotating shaft.

In some embodiments, the spring seat includes an annular cylindrical first body portion, two inner rings protruding and extending radially inwardly from the radially inner side of the first body portion and spaced apart from each other in the axial direction, and The spring connected to one of the two inner rings, the dynamic friction ring and the second sealing ring are partially accommodated between the two inner rings.

In some embodiments, the dynamic friction ring is made of polytetrafluoroethylene.

Beneficial effect

The invention provides a cleaning pump with a mechanical seal structure, which has good sealing reliability, higher power density of the motor, and smaller volume of the cleaning pump.

Description of the drawings

FIG. 1A shows a schematic block diagram of the structure of the cleaning system according to the first embodiment of the present invention.

Fig. 1A1 shows a working mode of the cleaning system according to the first embodiment of the present invention.

FIG. 1B shows a schematic block diagram of the structure of the cleaning system according to the second embodiment of the present invention.

Fig. 1C shows a schematic block diagram of the structure of the cleaning system according to the third embodiment of the present invention.

FIG. 1D shows a schematic block diagram of the structure of the cleaning system according to the fourth embodiment of the present invention.

Fig. 2A shows a three-dimensional schematic diagram of the first embodiment of the cleaning pump of the cleaning system.

Fig. 2B shows a cross-sectional view of the cleaning pump shown in Fig. 2A.

Fig. 2C shows an exploded view of the cleaning pump shown in Fig. 2A.

Fig. 2D shows another exploded view of the cleaning pump shown in Fig. 2A.

Fig. 2E shows an exploded view of the stator of the cleaning pump shown in Fig. 2C.

Fig. 2F shows an exploded view of the rotor of the cleaning pump shown in Fig. 2C.

Figure 3 shows a cross-sectional view of a second embodiment of the cleaning pump of the cleaning system.

Figure 4A shows a cross-sectional view of a third embodiment of the cleaning pump of the cleaning system.

Fig. 4B shows an exploded view of the cleaning pump shown in Fig. 4A.

Fig. 4C shows another exploded view of the cleaning pump shown in Fig. 4A.

Fig. 4D shows a perspective view of the pump wheel of the cleaning pump shown in Fig. 4B.

FIG. 5A shows a three-dimensional schematic diagram of a fourth embodiment of the cleaning pump of the cleaning system.

Fig. 5B shows a cross-sectional view of the cleaning pump shown in Fig. 5A.

Fig. 5C shows an exploded view of the cleaning pump shown in Fig. 5A.

Fig. 5D shows an exploded view of the stator of the cleaning pump shown in Fig. 5C.

Fig. 5E shows an exploded view of the rotor of the cleaning pump shown in Fig. 5C.

Fig. 5F shows an exploded view of the mechanical seal structure of the cleaning pump shown in Fig. 5C.

Fig. 5G shows another exploded view of the mechanical seal structure of the cleaning pump shown in Fig. 5C.

Fig. 6A shows a cross-sectional view of a fifth embodiment of the cleaning pump of the cleaning system.

Fig. 6B shows an exploded view of the cleaning pump shown in Fig. 6A.

Fig. 7 shows a cross-sectional view of a sixth embodiment of the cleaning pump of the cleaning system.

Fig. 8 shows a cross-sectional view of a seventh embodiment of the cleaning pump of the cleaning system.

Fig. 9A shows a cross-sectional view of an eighth embodiment of the cleaning pump of the cleaning system.

Fig. 9B shows an exploded view of the cleaning pump shown in Fig. 9A.

Fig. 9C shows an exploded view of the end cover assembly of the cleaning pump shown in Fig. 9B.

Fig. 9D shows another exploded view of the end cover assembly of the cleaning pump shown in Fig. 9B.

Fig. 10A shows a cross-sectional view of a ninth embodiment of the cleaning pump of the cleaning system.

Fig. 10B shows an exploded view of the cleaning pump shown in Fig. 10A.

Figure 11 shows a cross-sectional view of a tenth embodiment of the cleaning pump of the cleaning system.

Embodiments of the present invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, so as to make the technical solutions and beneficial effects of the present invention clearer. It can be understood that the drawings are only provided for reference and illustration, and are not used to limit the present invention. The dimensions shown in the drawings are only for the convenience of clear description, and do not limit the proportional relationship.

1A, the cleaning system of the first embodiment of the present invention includes a controllable cleaning pump 10 for providing pressurized liquid (for example, water), and a controllable air pump 11 for providing pressurized gas (for example, air). , And a controllable control valve 13A. The cleaning pump 10 is in communication with a reservoir 14 for storing cleaning liquid. The control valve 13A communicates with the cleaning pump 10, the air pump 11, and the discharge port 12 of the cleaning system through a pipeline such as a hose, and is used to control whether the liquid of the cleaning pump 10 and the gas of the air pump 11 are discharged to The discharge port 12. By controlling the control valve 13A, it is possible to open only the liquid flow path to allow the pressurized liquid to be discharged from the discharge port 12 for cleaning, and only open the gas flow path to discharge the pressurized gas from the discharge port 12 for cleaning and/ Or dry, or connect the liquid flow path and the gas flow path so that the pressurized liquid and the pressurized gas are discharged from the discharge port 12 for cleaning, which not only combines liquid cleaning and gas cleaning/drying, providing diversified options and functions, but also Helps reduce the consumption of cleaning fluid.

Preferably, the control valve 13A is a three-way valve, the first inflow port 13A1 of which is in communication with the cleaning pump 10, the second inflow port 13A2 is in communication with the air pump 11, and the outflow port 13A3 is in communication with the discharge port 12. Only one control valve 13A is used, which not only helps to reduce the cost, but also reduces the volume. In this embodiment, the control valve 13A may be a one-way valve or a proportional valve.

The cleaning system of the present invention includes a plurality of discharge ports 12, and the cleaning system further includes a nozzle 15 connected to the discharge ports 12. In this embodiment, the liquid flow path and the gas flow path share the same nozzle 15, and the liquid flow path and the gas flow path share at least part of the pipeline, which not only helps to reduce the cost, but also reduces the volume. The cleaning system in this embodiment is particularly suitable for cleaning foreign objects on multiple optical sensors of automobiles, such as cameras, radars, and lidars. When in use, the nozzle 15 can be cleaned by approaching and aiming at the surface of the sensor to be cleaned.

Preferably, the cleaning system further includes a controllable valve block 16A connected between the control valve 13A and the discharge port 12, for diverting the liquid and/or gas discharged from the control valve 13A to The plurality of discharge ports 12. In this embodiment, the valve block 16A includes an inlet port 16A1, a plurality of outlet ports 16A2 (three shown in the figure), and a plurality of on-off valves 16A3 connected between the inlet port 16A1 and the plurality of outlet ports 16A2. The inlet port 16A1 communicates with the outlet port 13A3 of the control valve 13A. The on-off valve 16A3 is used to control whether liquid and/or gas flows from the inlet port 16A1 to the corresponding outlet port 16A2. The plurality of discharge ports 16A2 and the plurality of discharge ports 12 communicate with each other one by one. In other words, the liquid flow path and the gas flow path in this embodiment share the same valve block 16A, which can not only split the gas and/or liquid to the multiple discharge ports 12, but also help reduce cost and volume.

The cleaning system in this embodiment also includes a control unit (not shown) for controlling the activation or deactivation of the cleaning pump 10, the air pump 11, the control valve 13A, and the valve block 16A.

1A1, in a working mode of the cleaning system, first open one or more on-off valves 16A3 in the valve block 16A as needed, and then control the control valve 13A to connect the cleaning pump and the valve block 16A to clean with liquid for a period of time t1, after the liquid cleaning is finished, the control valve 13A is controlled so that the cleaning pump is disconnected from the valve block 16A, and the air pump is connected to the valve block 16A to dry with gas for a period of time t2, and then the cleaning can be ended. Preferably, t1 is less than t2, and more preferably, t2 is approximately three times of t1 to reduce liquid consumption.

1B, the cleaning system of the second embodiment of the present invention is similar to the cleaning system of the aforementioned first embodiment, the same parts will not be repeated here, and the main difference lies in the control valve. Unlike the first embodiment that uses a three-way valve as the control valve, the control valve 13B of this embodiment is composed of a T-shaped connecting pipe 13B1, a first check valve 13B2, and a second check valve 13B3. Wherein, the T-shaped connecting pipe 13B1 includes a first end, a second end and a third end. The first check valve 13B2 is connected between the first end of the T-shaped connecting pipe 13B1 and the cleaning pump 10. The second check valve 13B3 is connected between the second end of the T-shaped connecting pipe 13B1 and the air pump 11. The third end of the T-shaped connecting pipe 13B1 communicates with the inlet port 16A1 of the valve block 16A. When in use, by controlling the opening and closing of the first check valve 13B2 and the second check valve 13B3, it is also possible to achieve the foregoing as required to allow only the pressurized liquid to be discharged from the discharge port 12 for cleaning, and only The pressurized gas is discharged from the discharge port 12 for cleaning and/or drying, or the mixture of pressurized liquid and pressurized gas is discharged from the discharge port 12 for cleaning.

1C, the cleaning system of the third embodiment of the present invention is similar to the cleaning system of the aforementioned first embodiment, and the same parts will not be repeated here. The main difference between this embodiment and the first embodiment lies in the following two points: First, the liquid flow path and the gas flow path in this embodiment use separate valve blocks, instead of sharing the same valve block. Specifically, the cleaning system in this embodiment includes a cleaning system that is only used to split the liquid flow path. A first valve block 16B1 to the plurality of discharge ports 12 and a second valve block 16B2 only for branching the gas flow path to the plurality of discharge ports 12. The first valve block 16B1 and the second valve block 16B2 may each adopt the valve block structure in the aforementioned first embodiment. Second, based on the first difference, the cleaning system of this embodiment includes a plurality of control valves 13A, and the control valve 13A is no longer connected between the cleaning pump 10/air pump 11 and the valve block 16B1/16B2, but is connected to the first Between a valve block 16B1 and a second valve block 16B2 and the discharge port 12. Specifically, the control valve 13A in this embodiment is a three-way valve. The first inflow port 13A1 of each control valve 13A is correspondingly connected to one of the discharge ports of the first valve block 16B1, the second inflow port 13A2 is correspondingly connected to one of the discharge ports of the second valve block 16B2, and the outflow port 13A3 is correspondingly connected to one of the rows. Exit 12. It is worth mentioning that the liquid flow path and the gas flow path in this embodiment still share the nozzle 15 and at least part of the pipeline.

1D, the cleaning system of the fourth embodiment of the present invention is similar to the aforementioned cleaning system of the third embodiment, and the same parts will not be repeated here. The main difference from the third embodiment is the control valve. Unlike the third embodiment, which uses a three-way valve as a control valve, each control valve 13B in this embodiment is composed of a T-shaped connecting pipe 13B1, a first check valve 13B2, and a second check valve 13B3. Wherein, the T-shaped connecting pipe 13B1 includes a first end, a second end and a third end. The first check valve 13B2 is connected between the first end of the T-shaped connecting pipe 13B1 and a corresponding discharge port of the first valve block 16B1. The second check valve 13B3 is connected between the second end of the T-shaped connecting pipe 13B1 and a corresponding discharge port of the second valve block 16B2. The third end of the T-shaped connecting pipe 13B1 communicates with a corresponding discharge port 12. When in use, by controlling the opening and closing of the first check valve 13B2 and the second check valve 13B3, it is also possible to achieve the foregoing as required to allow only the pressurized liquid to be discharged from the discharge port 12 for cleaning, and only The pressurized gas is discharged from the discharge port 12 for cleaning and/or drying, or the mixture of pressurized liquid and pressurized gas is discharged from the discharge port 12 for cleaning.

Hereinafter, a number of embodiments of the cleaning pump applicable to the cleaning system of the above embodiments will be described in detail.

Referring to FIGS. 2A to 2F, the first embodiment of the cleaning pump includes a motor 20 and a pump body 21. In this embodiment, the motor 20 is a brushless DC motor, and includes a hollow cylindrical motor housing 22 arranged in sequence from the outside to the inside, a ring-shaped stator 24 accommodated in the motor housing 22, and a fixed A hollow cylindrical sleeve 26 with one end open and one end closed is housed in the stator 24, and a rotor 28 housed in the sleeve 26, wherein the diameter between the sleeve 26 and the rotor 28 is An annular gap 260 is formed in the direction.

The stator 24 includes a ring-shaped stator core 240, an insulating frame 241 installed on the stator core 240, and a winding 242 wound on the insulating frame 241. In this embodiment, the insulating frame 241 includes an upper insulating frame 241A and a lower insulating frame 241B respectively sleeved on the stator core 240 along the axial ends of the stator core 240. The stator 24 further includes a ground terminal 241C inserted in the lower insulation frame 241B for grounding the stator core 240, a ring-shaped terminal assembly 243 arranged below the stator core 240 in the axial direction, and The Hall sensor assembly 244 on the radially outer side of the terminal assembly 243. The terminal assembly 243 includes a plurality of terminals 243A and a terminal bracket 243B integrally formed with the plurality of terminals 243A by overmolding, and the plurality of terminals 243A are electrically connected to the corresponding windings 242 through connecting wires 243C. The Hall sensor assembly 244 includes a Hall sensor bracket 244A and a Hall sensor 244B inserted in the Hall sensor bracket 244A. The Hall sensor 244B is used to detect the rotation position or the rotation angle of the rotor 28, and The detection result is transmitted to an external controller, and then the operation of the motor 20 is controlled by the controller.

The rotor 28 includes a rotating shaft 280, a rotor iron core 281 fixed on the outer circumference of the rotating shaft 280, a plurality of rotor magnets 282 arranged on the outer circumference of the rotor iron core 281 at intervals in the circumferential direction, and a rotor iron core covered 281 and a plurality of rotor magnets 282 outside the rotor cover 283, wherein the rotating shaft 280 penetrates both axial ends of the rotor cover 283. Preferably, the output end of the rotating shaft 280 is formed with at least a cut surface 280A so as to stably transmit the torque to the pump wheel (described in detail later). In this embodiment, the rotor core 281 is formed by stacking a plurality of silicon steel sheets. The rotor 28 includes four arc-shaped rotor magnets 282 evenly distributed on the outer circumference of the rotor core 281. The rotor cover 283 includes an upper rotor cover 283A and a lower rotor cover 283B. Both the upper rotor cover 283A and the lower rotor cover 283B are in the shape of a hollow cylinder and have an open end and a closed end. Both ends of the axial direction respectively penetrate through the perforations of the upper rotor cover 283A and the perforations of the lower rotor cover 283B.

The pump body 21 includes a pump casing 23 fixedly connected to the motor 20, a base 25 fixedly connected to the sleeve 26, and a pump wheel 29. The pump housing 23 and the base 25 enclose a pump cavity 27, and the pump wheel is arranged in the pump cavity 27. The rotating shaft 280 of the motor 20 extends into the pump cavity 27, and the pump wheel 29 is driven to rotate by the rotating shaft 280. The pump housing 23 is formed with a liquid inlet 230 extending in parallel to the axial direction and a liquid outlet 231 extending in the horizontal direction. In this embodiment, the liquid inlet 230 is aligned with the center of the pump housing 23 and its axis coincides with the axis of the pump wheel 29. The liquid discharge port 231 protrudes and extends substantially tangentially outward along the side wall of the pump casing 23. The base 25 is generally in the shape of a disc, and a through hole 250 that penetrates the base 25 in the axial direction is formed on the base 25 to allow the rotating shaft 280 to penetrate the base 25 and extend into the pump cavity 27 to be connected to the pump wheel 29. The base 25 is provided with a bearing 251 corresponding to the position of the through hole 250 to support the rotating shaft 280 in rotation. The pump body 21 in this embodiment is a centrifugal pump, and its pump wheel 29 can adopt an existing pump wheel structure, for example, as shown in FIG. The pump wheel 29 of a blade 291. Preferably, a non-circular hole 292 is formed in the center of the pump wheel 29, such as a D-shaped hole or other polygonal holes as shown in the figure. The connection to improve the stability of the transmission.

In this embodiment, driven by the pump wheel 29, the liquid enters the pump cavity 27 from the liquid inlet 230 and is discharged from the liquid outlet 231. Part of the liquid enters the annular gap 260 between the sleeve 26 and the rotor 28 from the through hole 250 of the base 25, and then is discharged to the drain 231 through the through hole 250 of the base 25, where the opening of the sleeve 26 The end is sealed and connected with the pump casing 23 to prevent liquid from entering the stator 24. In other words, this embodiment adopts a static sealing method to prevent liquid from entering the stator 24. In addition, the pump body 21 of this embodiment is driven by a brushless DC motor. Compared with the prior art that uses a brush motor to drive the pump, the cleaning pump in this embodiment has a faster response speed and a longer life.

Referring to FIG. 3, the second embodiment of the cleaning pump is similar to the first embodiment of the cleaning pump, and the same parts will not be repeated here. The main difference is that the cleaning pump in this embodiment integrates a controller 30. In this embodiment, the controller 30 is a PCB controller, which is mounted to the motor housing and arranged at the axial lower end of the terminal assembly 243, and the terminals of the terminal assembly 243 are electrically connected to the controller 30 , So that the controller 30 can control the current magnitude and direction of the winding 242 of the stator 24, thereby controlling the operation of the rotor 28. The Hall sensor 244B is electrically connected to the controller 30 so that the detection result of the Hall sensor 244B can be transmitted to the controller 30. Preferably, the controller 30 is plug-connected to a boss 261 (visible in FIG. 2D) formed at the lower axial end of the sleeve 26. Compared with the first embodiment of the cleaning pump, the controller 30 of this embodiment is integrated in the cleaning pump, and the entire system has a simpler structure and fewer parts.

4A to 4D, the third embodiment of the cleaning pump is similar to the second embodiment of the cleaning pump, the same parts are not repeated here, the main difference is that the pump body 41 of the cleaning pump in this embodiment is Side tank pump.

Specifically, in this embodiment, the pump body 41 includes a pump housing 43, a base 45 and a pump wheel 49. A non-closed first annular groove 432 surrounding the center of the pump wheel 49 is recessed on the axial lower end surface of the pump casing 43, that is, toward the end surface of the pump wheel 49. The liquid inlet 430 extending parallel to the axial direction on the pump casing 43 is arranged offset from the center of the pump casing 43 and communicates with one end of the first annular groove 432. The liquid discharge port 431 extending in the horizontal direction on the pump casing 43 communicates with the other end of the first annular groove 432. The liquid discharge port 431 in this embodiment also protrudes and extends substantially tangentially outward along the side wall of the pump housing 43. The non-closed first annular groove 432 helps prevent the liquid from flowing in the direction opposite to the rotation direction of the pump wheel 49. Preferably, the first annular groove 432 is approximately C-shaped, and its wrap angle on the circumference is approximately between 300° and 350°, preferably about 330°. Preferably, one end of the first annular groove 432 is vertically connected with the liquid inlet 430, and the bottom wall of the other end obliquely extends to form an inclined surface 433 to communicate with the liquid discharge port 431 extending in the horizontal direction.

Preferably, corresponding to the first annular groove 432, the axial upper end surface of the base 45, that is, the end surface facing the pump wheel 49 is also recessed and formed with a non-closed second annular groove 451 surrounding the center of the pump wheel 49. In this embodiment, the second annular groove 451 is also substantially C-shaped. Preferably, the radial openings of the first annular groove 432 and the second annular groove 451 have the same size and are aligned in the axial direction. More preferably, the circumferential ends of the first annular groove 432 and the second annular groove 451 are also aligned along the axial direction one by one. In addition, the upper axial end surface of the base 45 in this embodiment also vertically extends to form a convex ring 452 surrounding the second annular groove 451. The convex ring 452 and the upper axial end surface of the base 45 jointly enclose a first receiving groove 453 for receiving the pump wheel 49. The pump housing 43 covers the upper part of the first receiving groove 453 so as to form a pump cavity 47.

The pump wheel 49 in this embodiment includes a disc-shaped hub 490 and a plurality of blades 491 extending radially outward from the outer peripheral wall of the hub 490. The non-circular hole 492 for connecting with the rotating shaft 280 is formed in the center of the hub 490. Based on the design of the non-circular hole 492, in order to improve the rotation stability of the pump wheel 49, it is also preferable to form a balance hole 493 on the hub 490. In addition, it is also preferable to form a plurality of lightening holes and/or grooves 494 on the hub 490.

A fluid channel 495 is formed between adjacent blades 491 of the pump wheel 49. A plurality of fluid channels 495 are evenly spaced in the circumferential direction and communicate with the first annular groove 432 and the second annular groove 451, so as to share a common A C-shaped side runner is formed. Preferably, the radial width of each fluid channel 495 is consistent with the radial openings of the first annular groove 432 and the second annular groove 451 and is axially aligned.

More preferably, the outer peripheral wall of the hub 490 of the pump wheel 49 extends radially outward to form a flange 496 with a gradually reduced thickness. The flange 496 is preferably located at the axial middle position of the outer peripheral wall of the hub 490. More preferably, the two axial ends of the flange 496 transition to the corresponding axial ends of the hub 490 in an arc shape, respectively. The design of the flange 496 helps to reduce the pressure pulsation caused by the liquid flow, thereby reducing noise. Preferably, the pump wheel 49 in this embodiment further includes a connecting ring 497 connecting the outer peripheral walls of the plurality of blades 491. The design of the connecting ring 497 helps to improve the overall strength of the pump wheel 49 and is also more conducive to the flow of liquid along the side flow channel.

Preferably, the pump wheel 49 can be mounted on the rotating shaft 280 in an axially floating manner. Specifically, the pump wheel 49 and the rotating shaft 280 are loosely fitted so that the pump wheel 49 can move axially relative to the rotating shaft 280. At the same time, the axial thickness of the pump wheel 49 is slightly smaller than the axial height of the pump cavity 47 (that is, the distance between the axial lower end surface of the pump casing 43 and the axial upper end surface of the base 45), thereby avoiding installation errors This results in a tight fit between the pump wheel 49 and the pump casing 43 or the base 45 and hinders the rotation of the pump wheel 49. Through this design, a first axial gap 498A is formed between the axial upper end surface of the pump wheel 49 and the axial lower end surface of the pump casing 43, and the axial lower end surface of the pump wheel 49 and the base A second axial gap 498B is formed between the upper axial end surfaces of 45. According to the required pump pressure, the heights of the first axial gap 498A and the second axial gap 498B are preferably between 0-0.3 mm. Also preferably, an annular radial gap 499 is also formed between the connecting ring 497 and the convex ring 452 of the base 45. According to the required pump pressure, the width of the radial gap 499 is also preferably Between 0-0.3mm. It can also prevent the installation error from causing excessive tight fitting and hindering the rotation of the pump wheel 49.

Driven by the pump wheel 49, the liquid enters from the liquid inlet 430, flows along the side flow channel, and is discharged from the liquid discharge port 431. It is inevitable that part of the liquid flows from the through hole 450 of the base 45 into the sleeve 26 through the second axial gap 498B. Since the open end of the sleeve 26 is in a sealed connection with the pump casing 43, the liquid can be effectively prevented. Enter the stator 24. In this embodiment, a side groove pump structure is adopted, the rotation speed of the pump wheel 49 is smaller, and the noise is lower.

Referring to FIGS. 5A to 5G, the fourth embodiment of the cleaning pump is similar to the first embodiment of the cleaning pump, and the same parts will not be repeated here. The main difference lies in the structure of the stator and the rotor, and the sealing method.

Specifically, the motor 50 of the cleaning pump in this embodiment is also a brushless DC motor, and includes a hollow cylindrical motor housing 52 with one end open and one end closed, and an annular stator contained in the motor housing 52. 54. The rotor 58 contained in the stator 54, the front cover 56 covering the open end of the motor housing 52, and the gap between the open end of the motor housing 52 and the front cover 56 Between the connection head assembly 59. In other words, the motor 50 of the cleaning pump in this embodiment no longer includes the sleeve 26.

The connecting head assembly 59 includes a connecting ring 590 arranged between the open end of the motor housing 52 and the front cover 56, and the connecting ring 590 is integrally formed in the connecting ring 590 by overmolding. A first connector 591 for an external controller that is electrically connected to two terminals, and a Hall sensor assembly 592 arranged at the end of the connecting ring 590 opposite to the first connector 591. The Hall sensor assembly 592 includes a plurality of terminals (not shown) integrally formed in the connecting ring 590 by overmolding, and a second terminal for an external controller electrically connected to one end of the plurality of terminals. Two connecting heads 593, a PCB board 594 electrically connected to the other ends of the multiple terminals, a Hall sensor 595 electrically connected to the PCB board 594, and a Hall sensor bracket 596 for mounting the Hall sensor 595.

The stator 54 in this embodiment includes a ring-shaped stator core 540, an insulating frame 541 installed on the stator core 540, a winding 542 wound on the insulating frame 541, and an axially upper portion of the stator core 540. The ring-shaped terminal assembly 543. In this embodiment, the stator core 540 is formed by stacking a plurality of silicon steel sheets. The insulating frame 541 includes an upper insulating frame 541A and a lower insulating frame 541B respectively sleeved on the stator iron core 540 along the axial ends of the stator iron core 540. The terminal assembly 543 includes a plurality of terminals 543A and a terminal bracket 543B integrally formed with the plurality of terminals 543A by overmolding, and the terminal bracket 543B is fixed to the upper insulating frame 541A. One end of the multiple terminals 543A of the terminal assembly 543 is electrically connected to the corresponding winding 542, and the other end is electrically connected to the corresponding terminal in the connecting ring 590.

The rotor 58 in this embodiment includes a rotating shaft 580, a rotor core 581 fixed on the outer periphery of the rotating shaft 580, a plurality of rotor magnets 582 embedded in the rotor core 581 at intervals in the circumferential direction, and a fixed sleeve at The rotating shaft 580 is respectively located at two partitions 583 at the two axial ends of the rotor core 581. In this embodiment, the rotor core 581 is formed by stacking a plurality of silicon steel sheets. The rotor 58 includes four plate-shaped rotor magnets 582 embedded in the rotor core 581 at even intervals. Preferably, two adjacent plate-shaped rotor magnets 582 are perpendicular to each other. The partition 583 limits the rotor magnet 582 in the axial direction to prevent the rotor magnet 582 from falling during the high-speed rotation and vibration of the rotor 58. In addition, by adjusting the structure and weight of the two partitions 583, the balance of the rotor 58 can be ensured and noise can be reduced. In this embodiment, the rotating shaft 580 is also fixedly connected with a magnetic ring 584 at a position adjacent to the upper axial end of the rotor magnet 582. The magnetic ring 584 causes the magnetic field to change as the rotor 58 rotates. The aforementioned Hall sensor 595 detects the rotation position or the rotation angle of the rotor 58 by detecting the change in the magnetic field.

The cleaning pump in this embodiment also includes a mechanical seal structure 51 arranged between the base 55 of the pump and the front cover 56. The rotating shaft 580 penetrates the front cover 56, the mechanical seal structure 51, and the through hole 550 of the base 55 to connect with the pump wheel 29. In this embodiment, the mechanical seal structure 51 includes a static friction ring assembly 53 located at the upper axial end (an end close to the base 55) and a dynamic friction ring assembly 57 located at the lower axial end (an end close to the front cover 56).

The static friction ring assembly 53 includes a static friction ring 530 and a first sealing ring 531 tightly covering the static friction ring 530. The static friction ring 530 is preferably made of a material with good wear resistance and high temperature resistance, such as ceramic or silicon carbide. The first sealing ring 531 is made of rubber and includes an annular end 533 and a side wall 535 extending perpendicularly from the outer periphery of the end 533. During installation, the first sealing ring wraps the static friction ring and makes the end 533 and the side wall 53 of the first sealing ring 531 closely fit the upper end surface and the outer peripheral surface of the static friction ring 530, respectively, so that the friction ring The 530 and the first sealing ring 531 avoid relative rotation due to friction. In this embodiment, the lower axial end surface of the base 55 protrudes and extends along the axial direction to form a ring 551. The ring 551 and the lower axial end surface of the base 55 jointly enclose a second receiving groove 552. The static ring assembly 53 is housed in an anti-rotational manner. The end 533 of the first sealing ring 531 abuts against the lower axial end surface of the base 55, and the side wall 535 abuts against the radial inner side of the ring 551.

The moving ring assembly 57 includes a moving friction ring 570, a second sealing ring 571 sealed between the lower axial end of the moving friction ring 570 and the rotating shaft 580, and an annular spacer 573 fixed on the rotating shaft 580, A spring seat 572 is arranged between the spacer 573 and the dynamic friction ring 570, and the spring seat 572 pushes the dynamic friction ring 570 so that the axial upper end surface of the dynamic friction ring 570 and the axial direction of the static friction ring 530 Keep the lower end face in close contact.

In this embodiment, the spring seat 572 includes an annular columnar first body portion 5720, a first inner ring 5721 and a second inner ring 5722 that protrude and extend radially inward from the radially inner side of the first body portion 5720. And a spring 5723 abutting against the lower axial end of the second inner ring 5722, wherein the first inner ring 5721 and the second inner ring 5722 are arranged relative to each other in the axial direction from top to bottom. The first inner ring 5721, the second inner ring 5722 and the corresponding side walls of the first body portion 5720 jointly enclose an annular cavity 5724. Preferably, the first inner ring 5721 is located at the upper end of the first body portion 5720 in the axial direction. The lower axial end surface of the second inner ring 5722 is arc-shaped to better fit the arc-shaped shape of the spring 5723.

It can be understood that the spring seat 572 may also have other structures, for example, it may be composed of several leaf springs.

Preferably, the second sealing ring 571 is made of rubber, and includes an annular columnar second body portion 5710 and an enlarged portion 5711 that extends outwardly in a generally conical shape from an upper axial end of the second body portion 5710. The second sealing ring 571 is sleeved on the rotating shaft 580 and the second body portion 5710 is in sealing connection with the outer peripheral wall of the rotating shaft 580. The end edge of the enlarged portion 5711 is received in the annular cavity 5724 and supported by the second inner ring 5722.

Preferably, the dynamic friction ring 570 is made of a material with good wear resistance, high temperature resistance and low friction coefficient, such as polytetrafluoroethylene (PTFE), and includes a ring-shaped third body part 5700 and a third body part 5700. A snap ring 5701 extends radially outward from the outer wall. The upper axial end surface of the third body portion 5700 abuts against the static friction ring 530. The snap ring 5701 is accommodated in the annular cavity 5724, and the upper axial end thereof abuts against the first inner ring 5721, and the lower axial end abuts against the upper axial end of the enlarged portion 5711. Preferably, the radially inner part of the snap ring 5701 extends downward in the axial direction to form a first boss 5702, and the upper axial end of the enlarged portion 5711 extends upward in the axial direction to form a second boss 5712. The first boss 5702 is engaged with the radial inner side of the second boss 5712 to improve the connection and sealing performance between the dynamic friction ring 570 and the second sealing ring 571. More preferably, the radially inner side of the first boss 5702 is conically transitioned to the radially inner side of the third body portion 5700.

Preferably, the dynamic friction ring assembly 57 further includes a rigid ferrule 574 arranged between the second sealing ring 571 and the spring 5723. The ferrule 574 includes an annular sheet-shaped abutting portion 5740 and a ring-shaped connecting portion 5741 extending axially from the inner side of the abutting portion 5740 in the radial direction. The spring 5723 axially abuts against the upper axial end of the abutting portion 5740, and the connecting portion 5741 clamps the outer wall of the second body portion 5710. Preferably, the lower axial end of the second body portion 5710 protrudes outward in the radial direction to form an outer ring 5713. Correspondingly, the inner wall of the ferrule 574 is also bent in a stepped shape to adapt to the shape of the outer ring 5713. To improve the stability of the connection between the ferrule 574 and the second sealing ring 571. The lower axial end surface of the second body portion 5710 is preferably flush with the lower axial end surface of the abutting portion 5740 and abuts against the spacer 573.

When the cleaning pump in this embodiment is running, the spacer 573 presses the spring seat 572 upwards in the axial direction and then presses the dynamic friction ring 570, so that the axial upper end surface of the dynamic friction ring 570 is in contact with the static friction ring 530. The lower end face of the axial direction is tightly against the top. At the same time, the rotating shaft 580 drives the second seal ring 571 to rotate, thereby driving the entire dynamic friction ring assembly 57 to rotate, so that the dynamic friction ring 570 rotates relative to the static friction ring 530, thereby realizing a mechanical dynamic seal. The rotating shaft 580 drives the pump wheel 29 to rotate. Under the action of the pump wheel 29, the liquid enters the pump cavity 27 from the liquid inlet 230 and is discharged from the liquid outlet 231. Part of the liquid is allowed to enter the sealed liquid chamber 510 inside the mechanical seal structure 51 from the through hole 550 of the base 55 (enclosed by the first seal ring 531, the static friction ring 530, the dynamic friction ring 570, the second seal ring 571 and the rotating shaft 580). As the aforementioned dynamic friction ring 570 and static friction ring 530 are made of good wear-resistant and high-temperature resistant materials, and their joint surfaces are smooth, the joint is tight, and the sealing reliability is good. Therefore, the mechanical seal in this embodiment The structure 51 can effectively prevent liquid from entering the inside of the motor 50. Studies have shown that the mechanical seal structure 51 in this embodiment can seal a high pressure liquid of 5 bar well. Furthermore, since the cleaning pump in this embodiment achieves liquid sealing through the mechanical seal structure 51 without using a sleeve, the annular gap between the stator 54 and the rotor 58 is smaller, the power density of the motor 50 is higher, and the cleaning pump The volume is also smaller.

6A and 6B, the fifth embodiment of the cleaning pump is similar to the fourth embodiment of the cleaning pump, the same parts will not be repeated here, the main difference is: the pump body 41 of the cleaning pump in this embodiment It is also the side tank pump in the third embodiment.

Referring to Fig. 7, the sixth embodiment of the cleaning pump is similar to the fifth embodiment of the cleaning pump, and the same parts are not repeated here. The main difference lies in the arrangement of the mechanical seal structure. Specifically, the specific structure of the mechanical seal structure 61 in this embodiment and the mechanical seal structure 51 of the fifth embodiment of the cleaning pump are still the same, but the mechanical seal structure 61 in this embodiment is relative to the fifth embodiment of the cleaning pump. The mechanical seal structure 51 is arranged upside down 180° in the axial direction. Correspondingly, the structure of the base 65 in this embodiment is also adaptively changed, that is, the lower axial end surface of the base 65 no longer forms the ring 551 for accommodating the static friction ring assembly. On the contrary, the static friction ring assembly 63 in this embodiment is supported on the front cover 56 in a non-rotational manner, and the spacer 673 of the dynamic friction ring assembly 67 is arranged axially upward and maintains a certain gap with the axial lower end surface of the base 65.

During operation, the spacer 673 presses the spring seat 672 downward in the axial direction to press the dynamic friction ring 670 so that the axial lower end surface of the dynamic friction ring 670 and the axial upper end surface of the static friction ring 630 abut against each other tightly. At the same time, the rotating shaft 580 drives the second seal ring 671 to rotate, thereby driving the entire dynamic friction ring assembly 67 to rotate, so that the dynamic friction ring 670 rotates relative to the static friction ring 630, thereby realizing a mechanical seal. The rotating shaft 580 drives the pump wheel 49 to rotate. Under the action of the pump wheel 49, the liquid enters the pump cavity 47 from the liquid inlet 430 and is discharged from the liquid outlet 431. Part of the liquid enters the sealed liquid chamber 610 (enclosed by the outer wall of the base 65, the front cover 56 and the mechanical seal structure 61) from the through hole 650 of the base 65. The mechanical seal structure 61 in this embodiment can also effectively prevent liquid from entering the inside of the motor. In addition, when the cleaning pump in the sixth embodiment is working, its mechanical seal structure 61 is entirely immersed in the liquid filled in the liquid chamber 610, which can be cooled well and has a longer life.

Referring to Figure 8, the seventh embodiment of the cleaning pump is similar to the sixth embodiment of the cleaning pump, and the same parts will not be repeated here. The main difference is that the base 75 of this embodiment is also formed with an axial penetration Its own vent 751. The exhaust hole 751 communicates with the liquid chamber 610 and the pump chamber 47. When the dynamic friction ring assembly 67 rotates in the liquid chamber 610, bubbles are likely to be generated in the liquid chamber 610, and such bubbles will affect the working stability of the pump wheel 49. By designing the exhaust hole 751, the bubbles in the liquid cavity 610 can be discharged, thereby improving the working stability of the pump wheel 49.

With reference to Figures 9A-9D, the eighth embodiment of the cleaning pump is similar to the fourth embodiment of the cleaning pump, and the same parts will not be repeated here. The main difference is that the motor of the cleaning pump of this embodiment is integrated with Controller 80.

Specifically, the motor housing 82 and the front cover 86 in this embodiment are integrally formed, wherein the end of the motor housing 82 facing away from the front cover 86 is formed as an open end instead of a closed end. The motor in this embodiment also includes an end cover assembly 84 covering the open end of the motor housing 82. The end cover assembly 84 includes an inner cover 840 received in the motor housing 82 and arranged adjacent to the open end of the motor housing 82, and spaced apart from the inner cover 840 and arranged on the motor housing 82 The open end of the outer cover 841. A receiving cavity 842 is formed between the inner cover 840 and the outer cover 841. The magnetic ring assembly 843 and the controller 80 are arranged in the receiving cavity 842 from top to bottom. The stator 54 and the rotor 58 are contained in a cavity 820 enclosed by the inner cover 840, the motor housing 82 and the front cover 86. Preferably, a sealing ring 821 is arranged between the inner cover 840 and the motor housing 82, and between the outer cover 841 and the motor housing 82, respectively.

In this embodiment, the magnetic ring assembly 843 includes a magnetic ring 8430, a connector 8431 fixed to the inner wall of the magnetic ring 8430 for fixing the magnetic ring 8430 to the shaft 880, and a protective cover 8432 for accommodating the magnetic ring 8430. The protective cover 8432 is in the shape of a hollow cylinder with one end open and one end closed, and its open end is fixedly connected to the inner cover 840 for protecting the magnetic ring 8430. Preferably, another sealing ring 8433 is also arranged between the protective cover 8432 and the inner cover 840. One end of the rotating shaft 880 penetrates the inner cover 840 to be fixedly connected with the connecting member 8431.

The controller 80 is supported by the outer cover 841 and is electrically connected to a plurality of terminals 800 connected to the winding 542 on the stator 54, wherein the plurality of terminals 800 penetrate the inner cover 840. Preferably, an insulating member 801 made of insulating material corresponding to the terminal 800 is arranged in the inner cover 840 in a one-to-one correspondence. Preferably, the insulating member 801 includes an annular body 802 and a support plate 803 protruding and extending radially outward from one end of the annular body 802. Correspondingly, the inner cover 840 is formed with a first hole 844 corresponding to the annular body 802 and a second hole 845 corresponding to the supporting plate 803, wherein the size of the first hole 844 is smaller than the size of the second hole 845.

When assembling, the terminal 800 connected to the stator 54 is aligned with the first hole 844 to penetrate the inner cover 840, and then the insulating member 801 is aligned from the lower end surface of the inner cover 840 to the corresponding terminal 800 and inserted so that the insulating member 801 The annular body 802 is received in the first hole 844, and the support plate 803 is received in the second hole 845. Then, preferably, glue is injected from the second hole 845 so that the insulating member 801 and the inner cover 840 are sealed and fixedly connected. Then, the magnetic ring assembly 843 can be assembled, and then the controller 80 can be inserted into the terminal 800. Finally, the outer cover 841 can be assembled. In this embodiment, the cleaning pump in the use process improves the airtightness of the receiving cavity 842. Therefore, the controller 80 is safe to use.

10A-10B, the ninth embodiment of the cleaning pump is similar to the eighth embodiment of the cleaning pump, the same parts will not be repeated here, the main difference lies in: the pump body 41 of the cleaning pump in this embodiment is also This is the side tank pump in the third embodiment.

11, the tenth embodiment of the cleaning pump is similar to the ninth embodiment of the cleaning pump, and the same parts will not be repeated here. The main difference is that the magnetic ring assembly 943 in this embodiment does not include the protection The cover 8432 only includes the magnetic ring 8430 and the connecting piece 8431.

The above are only the preferred specific embodiments of the present invention. The protection scope of the present invention is not limited to the above-listed examples. Any person skilled in the art can obviously obtain the technology within the technical scope disclosed in the present invention. Simple changes or equivalent replacements of the solutions fall within the protection scope of the present invention.

Claims

A cleaning pump includes a motor and a pump body that is arranged at one end of the motor and is driven by the motor, and is characterized in that it also includes a mechanical seal structure arranged between the motor and the pump body, and the mechanical seal structure is used for In order to prevent the liquid in the pump body from entering the motor, the mechanical seal structure includes a static friction ring assembly and a dynamic friction ring assembly arranged oppositely in the axial direction. The dynamic friction ring assembly is driven by the rotating shaft of the motor so as to be able to face each other The static friction ring assembly rotates.
The cleaning pump according to claim 1, wherein the static friction ring assembly is closer to the pump body than the dynamic friction ring assembly and is sealed and fixedly connected with the pump body, and a pump cavity is formed in the pump body, A liquid cavity is formed in the mechanical seal structure, and the liquid cavity is in communication with the pump cavity.
The cleaning pump according to claim 1, wherein the static friction ring assembly is closer to the motor than the dynamic friction ring assembly and is sealed and fixedly connected with the end of the motor, and a pump cavity is formed in the pump body , The mechanical seal structure, the end of the motor, and the pump body are jointly enclosed to form a liquid cavity, and the liquid cavity is in communication with the pump cavity.
The cleaning pump according to claim 3, wherein the pump body includes a pump casing, and the pump casing is enclosed to form a base of the pump cavity, and the base is formed to communicate with the pump. The cavity and the vent hole of the liquid cavity.
The cleaning pump according to claim 1, wherein the static friction ring assembly comprises a static friction ring, and a first seal ring that is sealed and fixedly connected with the static friction ring.
The cleaning pump according to claim 5, wherein the static friction ring has an annular shape and is made of ceramic or silicon carbide.
The cleaning pump according to claim 5 or 6, wherein the first sealing ring is made of ceramic or silicon carbide, and includes a ring-shaped substrate and a side wall extending perpendicularly from the outer periphery of the substrate.
The cleaning pump according to claim 1, wherein the dynamic friction ring assembly comprises a dynamic friction ring, a second sealing ring sealingly connecting the dynamic friction ring and the rotating shaft, and used to compress the dynamic friction ring so that the dynamic friction The ring is pressed against the spring seat of the static friction ring assembly, and a spacer used for pressing against the spring seat and fixedly connected with the rotating shaft.
The cleaning pump according to claim 8, wherein the spring seat comprises a first body portion having a ring-shaped columnar shape, and protruding and extending radially inwardly from the radially inner side of the first body portion and extending along the axial direction. Two relatively spaced inner rings and a spring connected to one of the two inner rings, the dynamic friction ring and the second sealing ring are partially accommodated between the two inner rings.
The cleaning pump according to claim 8, wherein the dynamic friction ring is made of polytetrafluoroethylene.