Electronic water pump with sliding bearing structure

Abstract

The utility model relates to an electronic water pump with a sliding bearing structure, which comprises a motor shell, one side of the motor shell is connected with a volute, and the volute is provided with a water inlet and a water outlet which are communicated with each other; a motor front end cover and a motor rear end cover are installed at the front end and the rear end in the motor shell respectively, a motor stator and a motor rotor are installed in the middle of the motor shell, the motor stator is located on the periphery of the motor rotor, a shielding sleeve is arranged between the motor stator and the motor rotor, and a front bearing bush is installed in the motor front end cover. A rubber pad, a thrust disc, a front shaft sleeve and an impeller are installed on the front portion of the motor rotor shaft, a rear shaft sleeve is installed on the rear portion of the motor rotor shaft, the front bearing bush and the rear shaft sleeve form a sliding friction pair with the front shaft sleeve and the rear bearing bush respectively, and the rubber pad, the thrust disc, the front bearing bush and the motor front end cover axially abut against each other. The thrust bearing is stable in work and low in noise, and the shaft sleeve, the bearing bush and the thrust disc can all be made of high-wear-resistance ceramic materials, so that the service life is reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of water pumps and relates to an electronic water pump with a sliding bearing structure. Background Art

[0002] The existing standard configuration of water pumps is a friction pair composed of graphite and high-hardness martensitic stainless steel. Due to the low hardness of graphite, it is easy to wear and cause product failure, and the worn carbon powder can easily contaminate the coolant. In addition, the vibration of the water pump during operation can easily cause damage to the motor rotor. Summary of the Invention

[0003] The purpose of the utility model is to provide an electronic water pump with a sliding bearing structure, which can solve the above-mentioned problems and has a reliable service life.

[0004] According to the technical solution provided by the utility model: an electronic water pump with a sliding bearing structure, including a motor housing, one side of the motor housing is connected to the volute, and the volute is provided with a connected water inlet and water outlet; a motor front end cover and a motor rear end cover are respectively installed at the front and rear ends of the motor housing, a motor stator and a motor rotor are installed in the middle of the motor housing, the motor stator is located at the outer periphery of the motor rotor, a shielding sleeve is provided between the motor stator and the motor rotor, a front bearing is installed in the front end cover of the motor, a rear bearing is installed in the rear end cover of the motor, a rubber pad, a thrust plate, a front shaft sleeve, and an impeller are installed at the front of the motor rotor, and a rear shaft sleeve is installed at the rear of the motor rotor, the front bearing and the rear shaft sleeve respectively form a sliding friction pair with the front shaft sleeve and the rear bearing, and the rubber pad, thrust plate, front bearing, and the front end cover of the motor are axially opposed to each other.

[0005] As a further improvement of the present invention, the front end cover and the rear end cover of the motor are fixed to the inner hole of the motor housing by a stop structure for radial positioning; the shielding sleeve separates the motor stator and the motor rotor, and is sealed with the front end cover and the rear end cover of the motor; the motor stator and the motor housing are interference fit; the motor stator is arranged in a cavity formed by the motor housing and the shielding sleeve.

[0006] As a further improvement of the present invention, the front bearing is installed in the bearing chamber of the front end cover of the motor.

[0007] As a further improvement of the present invention, the front bearing is installed in the front end cover of the motor by interference fit.

[0008] As a further improvement of the present invention, the front bearing bush is connected to the front end cover of the motor by using an O-ring.

[0009] As a further improvement of the present invention, the rear bearing bush and the front bearing bush are made of ceramic material.

[0010] As a further improvement of the present invention, a connected water channel is provided in the motor housing and the motor rotor; the water channel includes a rotor water channel and a bearing flow groove; the rotor water channel runs through the middle of the rotor motor rotor, and the bearing flow groove is opened on the front bearing and the rear bearing, and the bearing flow groove is divided into a bearing flow inner groove and a bearing flow end groove; taking the front bearing as an example, a bearing hole is provided in the middle of the front bearing for accommodating the front end of the rotor motor rotor and the front shaft sleeve; the bearing flow inner groove is located on the inner circumference of the bearing hole, and the bearing flow end groove is located on the inner end face of the front bearing, and the bearing flow inner groove is connected to the bearing flow end groove; the number of the bearing flow inner groove and the bearing flow end groove is set according to the actual working conditions. In this embodiment, the number of the bearing flow inner groove and the bearing flow end groove is 4, which are evenly distributed on the inner circumference of the bearing hole and the inner end face of the front bearing.

[0011] The positive progress of this application is:

[0012] 1. The utility model works smoothly and has low noise. The shaft sleeve, bearing bush and thrust plate can all be made of highly wear-resistant ceramic materials, and have a reliable service life.

[0013] 2. The front and rear motor end covers of the utility model are rigidly connected to the casing through stoppers, which controls the alignment of the front and rear bearings, and then controls the alignment of the motor rotor, which helps to ensure the stability of the motor operation. 2. The bearing and the sleeve form a radial sliding friction pair, and the bearing and the thrust plate form an axial friction pair. The gap and surface roughness of the friction pair are easy to control. At the same time, the working surfaces of the bearing and the thrust plate are provided with flow grooves to ensure the formation of a liquid film, reduce friction, and take away the heat generated by friction. At the same time, the liquid film also has a certain vibration absorption capacity. 3. The bearing, sleeve and thrust plate can be made of a new type of highly wear-resistant ceramic material to solve the problem of easy wear and insufficient life of the electronic water pump bearings. 4. By using the impeller, the locking studs axially fix the front and rear sleeves, and by using an O-ring structure between the sleeve and the shaft, the sleeve is prevented from rotating when the rotor rotates. 5. When the electronic water pump is working, the motor rotor will have axial movement. An appropriate collision gap is designed between the rotor and the rear end cover to ensure the normal operation of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 It is a structural schematic diagram of the front bearing shell in the utility model.

[0016] Figure 1-Figure 2 The motor comprises an impeller 1, a front end cover 2, a motor housing 3, a motor stator 4, a shielding sleeve 5, a locking screw 6, a rear end cover 7, a front shaft sleeve 8, a front bearing 9, a thrust plate 10, a rubber pad 11, a motor rotor 12, a rear shaft sleeve 13, a rear bearing 14, a volute 15, etc. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate for the embodiments of the present invention described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed may also be "included" and "having"; for example, a process, method, system, product or device that may include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0020] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text.

[0021] like Figure 1 As shown, the utility model is an electronic water pump with a sliding bearing structure, comprising a motor housing 3, one side of the motor housing 3 is connected to a volute 15, and the volute 15 is provided with a connected water inlet 16 and a water outlet 17; a motor front end cover 2 and a motor rear end cover 7 are respectively installed at the front and rear ends of the motor housing 3, a motor stator 4 and a motor rotor 12 are installed in the middle of the motor housing 3, the motor stator 4 is located at the outer periphery of the motor rotor 12, a shielding sleeve 5 is provided between the motor stator 4 and the motor rotor 12, a front bearing 9 is installed in the motor front end cover 2, a rear bearing 14 is installed in the motor rear end cover 7, a rubber pad 11, a thrust plate 10, a front shaft sleeve 8, and an impeller 1 are installed in the front of the motor rotor 12, and a rear shaft sleeve 13 is installed at the rear of the motor rotor 12, the front bearing 9 and the rear shaft sleeve 13 respectively form a sliding friction pair with the front shaft sleeve 8 and the rear bearing 14, and the rubber pad 11, the thrust plate 10, the front bearing 9, and the motor front end cover 2 are axially opposed to each other.

[0022] The motor front cover 2 and rear cover 7 are fixed to the inner bore of the motor housing 3 via stoppers for radial positioning. The shielding sleeve 5 separates the motor stator 4 from the motor rotor 12 and is sealed to the front cover 2 and rear cover 7. The motor stator 4 and motor housing 3 have an interference fit; the stator 4 is located in the cavity formed by the motor housing 3 and the shielding sleeve 5.

[0023] The front bearing 9 is installed in the bearing chamber of the motor front end cover 2. Specifically, Method 1: The front bearing 9 is installed in the motor front end cover 2 through an interference fit. Method 2: The front bearing 9 is connected to the motor front end cover 2 using an O-ring 18. The O-ring 18 is embedded in the bearing chamber of the motor front end cover 2. The outer circumference of the front bearing 9 is larger than the size of the O-ring 18. The front bearing 9 expands the O-ring 18, and the friction between the O-ring 18 and the motor front end cover 2 secures the front bearing 9 in the motor front end cover 2.

[0024] The rear bearing 14 is installed in the bearing chamber of the rear end cover 7 of the motor. The installation method is the same as the front bearing 9. The rear bearing 14 and the front bearing 9 have the same structure and size. They are made of ceramic material and have a long service life.

[0025] The front sleeve 8 is mounted on the front bearing of the motor rotor 12 , and the impeller 1 is threadedly connected to the front end of the motor rotor 12 . The impeller 1 presses the front sleeve 8 against the front shoulder of the motor rotor 12 to fix the front sleeve 8 to the motor rotor 12 .

[0026] The rear shaft sleeve 13 is sleeved on the rear bearing position of the motor rotor 12. The rear end of the motor rotor 12 is threadedly connected to the locking screw 6. The locking screw 6 presses the rear shaft sleeve 13 against the rear shoulder of the motor rotor 12 to fix the rear shaft sleeve 13 to the motor rotor 12.

[0027] In order to improve the firmness of the front shaft sleeve 8 , the rear shaft sleeve 13 and the motor rotor 12 , O-rings are installed between the front shaft sleeve 8 , the rear shaft sleeve 13 and the motor rotor 12 .

[0028] The rubber pad 11 and the thrust plate 10 are installed on the rotor motor rotor 12 through the locating pins. The two sides of the rubber pad 11 are close to the motor rotor and the thrust plate 10. The thrust plate 10 is in axial contact with the front bearing 9. The thrust plate 10 bears the axial force. The front bearing 9 transmits the vibration generated during work to the rubber pad 11 through the thrust plate 10. The rubber pad 11 can reduce the vibration and noise generated during work, making the water pump run more smoothly and quietly, and can absorb the impact of the motor rotor 12 generated during the vibration process.

[0029] The motor housing 3 and the motor rotor 12 are provided with a water channel connected to each other; the water channel includes a rotor water channel 12-1 and a bearing water channel; the rotor water channel 12-1 runs through the middle of the rotor motor rotor 12, and the bearing water channel is opened on the front bearing 9 and the rear bearing 14. The bearing water channel is divided into a bearing water channel inner channel 9-2 and a bearing water channel end channel 9-3. Taking the front bearing 9 as an example, Figure 2As shown, a bearing hole 9-1 is provided in the middle of the front bearing 9 for accommodating the front end of the rotor 12 of the rotor motor and the front shaft sleeve 8; the bearing inner flow groove 9-2 is located on the inner periphery of the bearing hole 9-1, and the bearing end flow groove 9-3 is located on the inner end face of the front bearing 9, and the bearing inner flow groove 9-2 is connected to the bearing end flow groove 9-3; the number of the bearing inner flow groove 9-2 and the bearing end flow groove 9-3 is set according to the actual working conditions. In this embodiment, the number of the bearing inner flow groove 9-2 and the bearing end flow groove 9-3 is 4, which are evenly distributed on the inner periphery of the bearing hole 9-1 and the inner end face of the front bearing 9.

[0030] The working process of this utility model is as follows:

[0031] The liquid flows into the inner cavity of the volute 15 from the water inlet 16, the motor rotor 12 rotates, and the impeller 1 discharges most of the liquid from the water outlet 17. A part of the liquid flows into the interior of the volute 15, passes through the bearing inner flow groove 9-2 and the bearing end flow groove 9-3, flows into the shielding sleeve 5, and then passes through the rear bearing 14 and flows from the rotor water channel 12-1 in the middle of the motor rotor 12 to the front end of the motor rotor 12, completing the circulation of the liquid.

[0032] Liquid cools the front and rear bearings and motor rotors and other components; at the same time, when the liquid passes through the bearing inner flow groove 9-2 and the bearing end flow groove 9-3, a liquid film is formed between the front bearing 9 and the front shaft sleeve 8, and between the front bearing 9 and the thrust plate 10, reducing friction and taking away the heat generated by friction. At the same time, the liquid film also has a certain vibration absorption ability.

[0033] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An electronic water pump with a sliding bearing structure, comprising a motor housing (3), one side of the motor housing (3) being connected to a volute (15), and the volute (15) being provided with a water inlet (16) and a water outlet (17) communicating with each other; characterized in that: A motor front end cover (2) and a motor rear end cover (7) are respectively installed at the front and rear ends of the motor housing (3), a motor stator (4) and a motor rotor (12) are installed in the middle of the motor housing (3), the motor stator (4) is located on the outer periphery of the motor rotor (12), a shielding sleeve (5) is provided between the motor stator (4) and the motor rotor (12), a front bearing (9) is installed in the motor front end cover (2), a rear bearing (14) is installed in the motor rear end cover (7), a rubber pad (11), a thrust plate (10), a front shaft sleeve (8), and an impeller (1) are installed at the front of the motor rotor (12), and a rear shaft sleeve (13) is installed at the rear of the motor rotor (12), the front bearing (9) and the rear shaft sleeve (13) respectively form a sliding friction pair with the front shaft sleeve (8) and the rear shaft sleeve (14), and the rubber pad (11), the thrust plate (10), the front bearing (9), and the motor front end cover (2) are axially opposed to each other.

2. The electronic water pump with a sliding bearing structure according to claim 1, characterized in that: The front end cover (2) and the rear end cover (7) of the motor are fixed to the inner hole of the motor housing (3) through a stopper structure for radial positioning; the shielding sleeve (5) separates the motor stator (4) and the motor rotor (12) and is sealed with the front end cover (2) and the rear end cover (7) of the motor; the motor stator (4) and the motor housing (3) are interference fit; the motor stator (4) is arranged in a cavity formed by the motor housing (3) and the shielding sleeve (5).

3. The electronic water pump with a sliding bearing structure according to claim 1, characterized in that: The front bearing (9) is installed in the bearing chamber of the front end cover (2) of the motor.

4. The electronic water pump with a sliding bearing structure according to claim 3, characterized in that: The front bearing (9) is installed in the front end cover (2) of the motor through interference fit.

5. The electronic water pump with a sliding bearing structure according to claim 3, characterized in that: The front bearing shell (9) is connected to the front end cover (2) of the motor using an O-ring (18).

6. The electronic water pump with a sliding bearing structure according to claim 1, characterized in that: The rear bearing bush (14) and the front bearing bush (9) are made of ceramic material.

7. The electronic water pump with a sliding bearing structure according to claim 1, characterized in that: A water channel is provided in communication with the motor housing (3) and the motor rotor (12); the water channel includes a rotor water channel (12-1) and a bearing bush flow groove; the rotor water channel (12-1) runs through the middle of the rotor motor rotor (12); the bearing bush flow groove is provided on the front bearing bush (9) and the rear bearing bush (14); and the bearing bush flow groove is divided into a bearing bush flow inner groove (9-2) and a bearing bush flow end groove (9-3).

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