Electronic water pump rotor damping structure

Abstract

The utility model relates to an electronic water pump structure. An electronic water pump rotor damping structure comprises a rotating shaft, the rotating shaft is sleeved with a rotor iron core and an impeller, a bearing is arranged above the rotor iron core, the bearing is located between the impeller and the rotor iron core, a plastic-coated part wrapping the rotor iron core is formed outside the rotor iron core, a buckle structure is arranged above the plastic-coated part, a gasket is installed on the buckle structure, and the rotor iron core is sleeved with the gasket. The gasket is connected with the bearing, and a damping ring is arranged between the gasket and the end face of the plastic-coated part. The utility model provides an electronic water pump rotor damping structure which is simple in structure, capable of effectively reducing axial vibration and noise, capable of avoiding collision caused by dramatic changes of working conditions of a water pump and good in economical efficiency. The technical problems that in the prior art, collision noise in the axial direction of an electronic water pump is large, and the damping effect is poor are solved.

Description

Technical Field

[0001] This utility model relates to an electronic water pump structure, and more particularly to an electronic water pump rotor vibration damping structure. Background Technology

[0002] Automotive electronic water pumps are commonly used in many new energy vehicles, RVs, and other special vehicles as miniature water pumps for water circulation, cooling, or onboard water supply systems. These miniature self-priming water pumps are collectively referred to as automotive water pumps. The circular motion of the motor causes the diaphragm inside the pump to reciprocate through a mechanical device, thereby compressing and stretching the air inside the pump chamber. Under the action of a one-way valve, positive pressure is created at the drain outlet, and a vacuum is created at the inlet, thus generating a pressure difference with the external atmospheric pressure. Under the action of this pressure difference, water is forced into the inlet and then discharged from the drain outlet. Under the action of the kinetic energy transmitted by the motor, water is continuously drawn in and discharged, forming a relatively stable flow rate.

[0003] Typically, the impeller of an automotive electric water pump has an axial force towards the impeller inlet due to the pressure difference during operation. This axial force varies depending on the operating conditions and can fluctuate even under the same conditions. Most electric water pumps on the market use sliding bearings and do not have an axial fixing structure like roller bearings, which can lead to collision noise and fail to meet better NVH requirements. Summary of the Invention

[0004] This utility model provides a simple structure that can effectively reduce axial vibration and noise, avoid collisions caused by drastic changes in pump operating conditions, and is economical for electronic water pump rotors; it solves the technical problems of high collision noise and poor vibration reduction effect in the axial direction of existing electronic water pumps.

[0005] The above-mentioned technical problem of this utility model is solved by the following technical solution: an electronic water pump rotor vibration damping structure includes a rotating shaft, on which a rotor core and an impeller are sleeved. A bearing is provided above the rotor core, located between the impeller and the rotor core. A plastic-coated part is formed around the rotor core, encasing it. A snap-fit ​​structure is provided above the plastic-coated part, and a gasket is installed on the snap-fit ​​structure. The gasket is in contact with the bearing, and a damping ring is provided between the end face of the gasket and the plastic-coated part. When axial collision or axial force fluctuation occurs, the gasket axially presses against the rubber ring, thereby reducing the impact of axial force fluctuation and reducing vibration and noise. The gasket rubs against the end face of the sliding bearing to provide thrust and balance the axial thrust. The metal gasket on the rotor is always in contact with the bearing, avoiding collisions caused by drastic changes in the water pump's operating conditions. Compared with existing rotor vibration damping structures on the market, the thrust gasket of this structure does not require other parts for fixing, and the rubber O-ring can be selected from existing O-rings according to actual needs, making it more economical.

[0006] Preferably, the snap-fit ​​structure includes an annular support ring formed on the upper surface of the plastic-coated part, with snap hooks evenly distributed on the inner wall of the support ring. The structure is simple, and the snap hooks provide axial fixation on one side, effectively preventing loosening.

[0007] Preferably, the hook has slots on both sides. The slots allow the hook to form an elastic body, facilitating the installation and removal of the gasket.

[0008] Preferably, the upper surface of the plastic-coated part is provided with an annular positioning protrusion, which is concentric with the annular support ring of the snap-fit ​​structure, and the shock-absorbing ring is sleeved on the positioning protrusion. This facilitates the installation and positioning of the shock-absorbing ring.

[0009] Preferably, the gasket is a metal gasket or a ceramic gasket.

[0010] Preferably, the rotor core and stator core are axially offset, and the height of the rotor core is lower than that of the stator core. This results in the rotor experiencing a smaller, continuous upward force, reducing the influence of axial forces.

[0011] Therefore, the electronic water pump rotor vibration damping structure of this utility model has the following advantages: by integrally molding the snap-fit ​​structure on the plastic-coated body, the structure is simple, and the plastic-coated body can also serve as an insulating space between the rotor and the stator; by fixing the gasket through the snap-fit ​​structure and arranging a rubber ring on one side of the gasket, axial collision can be effectively prevented and vibration and noise can be reduced. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of an electronic water pump.

[0013] Figure 2 This is a 3D diagram of the vibration damping structure of an electronic water pump rotor.

[0014] Figure 3 yes Figure 2 A three-dimensional view of the inner plastic-coated part. Detailed Implementation

[0015] The technical solution of the utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0016] Example:

[0017] like Figure 1 and 2As shown in Figure 3, an electronic water pump rotor damping structure includes a rotating shaft 2 located in the electronic water pump. A rotor core 5 is sleeved on the rotating shaft 2, and a stator core 6 is coaxially arranged outside the rotor core 5. The rotor core 5 and the stator core 6 are offset in the axial direction, and the height of the rotor core 5 is slightly lower than the height of the stator core 6. An impeller 1 is installed above the rotor core 5, and a bearing 8 is installed between the impeller 1 and the rotor core.

[0018] The rotor core 5 is encased in a plastic-coated body 7, which is cylindrical in shape. An annular support ring 10 is integrally formed on the upper surface of the plastic-coated body 7. Hooks 11 are evenly distributed on the inner wall of the support ring 10. Slots 9 are provided on both sides of the hooks 11, giving them a certain degree of elasticity. A circular metal washer 3 is fixed to the hooks 11, with the washer axially fixed on one side to prevent loosening. The metal washer 3 is always in contact with the bearing 8, avoiding collisions caused by drastic changes in pump operating conditions. An O-ring damping ring 4 is installed below the metal washer 3. The O-ring damping ring is a rubber ring; when axial collision or axial force fluctuation occurs, the washer axially presses against the O-ring damping ring, thereby reducing the impact of axial force fluctuations and lowering vibration and noise. The O-ring damping ring 4 is fitted onto an annular positioning protrusion 12 on the upper surface of the plastic-coated body 7, and the annular positioning protrusion 12 is concentric with the annular support ring 10.

[0019] The specific embodiments described herein are merely illustrative of the concept of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A vibration damping structure for an electronic water pump rotor, comprising a rotating shaft, on which a rotor core and an impeller are sleeved, and a bearing is provided above the rotor core, the bearing being located between the impeller and the rotor core, characterized in that: A plastic-coated part is formed around the rotor core to enclose it. A snap-fit ​​structure is provided above the plastic-coated part, and a gasket is installed on the snap-fit ​​structure. The gasket is connected to the bearing, and a shock-absorbing ring is provided between the gasket and the end face of the plastic-coated part.

2. The vibration damping structure for an electronic water pump rotor according to claim 1, characterized in that: The buckle structure includes an annular support ring formed on the upper surface of the plastic-coated part, and hooks are evenly distributed on the inner wall of the support ring.

3. The vibration damping structure for an electronic water pump rotor according to claim 2, characterized in that: The hook has slots on both sides.

4. The vibration damping structure for an electronic water pump rotor according to claim 1, 2, or 3, characterized in that: The upper surface of the plastic-coated part is provided with an annular positioning protrusion, which is concentric with the annular support ring of the snap-fit ​​structure, and the shock-absorbing ring is sleeved on the outside of the positioning protrusion.

5. A vibration damping structure for an electronic water pump rotor according to claim 1, 2, or 3, characterized in that: The gasket can be a metal gasket or a ceramic gasket.

6. The vibration damping structure for an electronic water pump rotor according to claim 1, 2, or 3, characterized in that: The rotor core and stator core are axially offset, and the height of the rotor core is lower than the height of the stator core.

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