Liquid balanced silent motor

Abstract

The application relates to the motor technical field, in particular to a liquid-balanced mute motor, which comprises a shell, a stator installed in the shell, and a rotor rotatably inserted into the shell and matched with the stator, the rotor is fixed with a balance weight assembly sleeved outside the shell, the balance weight assembly comprises a fixed weight part and an oil liquid damping part; the fixed weight part is in a columnar structure, comprises a circular top and an annular side wall vertically extended from the top edge, and the fixed weight part is fixed to the rotor through a mechanical connection mode. The basic balance weight is provided through the fixed weight part, the initial stability of the rotor operation is ensured, the damping force generated by the flow of oil liquid in the annular cavity and the baffle gap is utilized by the oil liquid damping part, vibration energy is dynamically absorbed, dynamic balance is improved, and noise is reduced.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a liquid-balanced silent motor, and more particularly to a motor structure that achieves dynamic balance optimization and effectively reduces operating noise through an internal liquid damping mechanism. Background Technology

[0002] In the field of motor manufacturing and application, dynamic balance performance is one of the key indicators for measuring its quality, stability, and service life, especially for variable frequency motors widely used in household appliances such as air purifiers. In air purifiers, the motor, as the core drive component, directly affects the overall noise level, purification efficiency, and user comfort. Specifically, during variable frequency motor operation, the rotor generates varying degrees of vibration and noise due to the interaction of centrifugal force, electromagnetic force, and mechanical inertia. Poor dynamic balance exacerbates bearing wear, induces electromagnetic and mechanical noise, and leads to uneven operation of the entire unit, thereby reducing the reliability of the air purifier and the user experience. Therefore, how to effectively suppress rotor vibration and achieve excellent dynamic balance has always been a direction of continuous exploration and improvement in the design of air purifier motors by those skilled in the art.

[0003] Currently, the most common and mature dynamic balancing technology in the industry involves detecting the phase and magnitude of the imbalance after the rotor is manufactured using a dynamic balancing tester. Correction is then achieved by adding or removing counterweights (e.g., riveting shims or drilling holes to remove weight) at specific locations on the rotor (such as balancing slots). While this method can achieve static balance to some extent, it is essentially a "static," one-time compensation. It cannot adapt to the dynamic imbalance problems caused by material deformation due to temperature rise, internal stress release, or speed changes during actual operation of the air purifier. Especially for variable frequency motors aiming for quiet operation over a wide speed range, this fixed counterweight method is clearly insufficient: a rotor balanced at a specific speed may vibrate again at another speed due to changes in its dynamic characteristics. This not only limits further improvements in motor performance but may also cause additional noise and vibration in high-speed or low-speed modes, affecting the overall quietness and long-term reliability of the air purifier. Utility Model Content

[0004] This application aims to provide a liquid-balanced silent motor to solve the vibration and noise problems caused by dynamic imbalance in existing motors during high-speed operation. By optimizing the balancing counterweight and damping structure, stable operation and low-noise output of the motor are achieved. Specifically, this application uses a combination design of a fixed counterweight and a hydraulic damping part, combined with sound-absorbing materials, to effectively suppress vibration propagation and noise generation, making it suitable for industrial or consumer applications with high requirements for quiet performance.

[0005] To achieve the above objectives, this application discloses a liquid-balanced silent motor, comprising a housing, a stator installed within the housing, and a rotor rotatably inserted into the housing and engaging with the stator. The rotor is fixedly fitted with a balance counterweight assembly sleeved outside the housing. This balance counterweight assembly is used to optimize the dynamic balance of the motor and reduce operating noise. Its structure includes a fixed counterweight section and an oil damping section, which work together to provide a stable damping effect and balance adjustment.

[0006] The fixed counterweight has a columnar structure, including a circular top and an annular sidewall extending vertically from the top edge. This fixed counterweight is mechanically connected to the rotor to provide basic balance. The oil damping part is annular, fitted and fixed to the outside of the annular sidewall of the fixed counterweight. The interior of the oil damping part forms an annular cavity filled with oil occupying 60% to 80% of its volume. The flow and damping effect of the oil absorb the vibration energy generated during rotor rotation, thereby improving balance and reducing noise.

[0007] The oil damping section includes a body and a sealing ring. The body has an open annular groove, and the sealing ring is installed at the open end of the annular groove to achieve a sealing connection. Multiple baffles are erected on the sealing ring, forming a fitting gap between the baffles and the inner wall of the annular groove. This allows the baffles and the annular groove to cooperate to form multiple interconnected annular oil chambers. During rotor rotation, the oil flows within the oil chambers and generates damping force through the interaction between the baffles and the gaps, thereby dynamically adjusting the balance and further suppressing vibration and noise.

[0008] Furthermore, a sound-absorbing cotton layer is attached to the inner sidewall of the fixed counterweight. This layer absorbs noise transmitted through the structure during motor operation, enhancing the overall noise reduction effect. The sound-absorbing cotton layer is tightly bonded to the inner surface of the annular sidewall, reducing noise transmission through the material's own sound-absorbing properties. Combined with the damping effect of the oil damping section, this achieves more comprehensive vibration and noise control.

[0009] The beneficial technical effects of this application include: providing a basic balance counterweight through the fixed counterweight section to ensure the initial stability of the rotor operation; the oil damping section dynamically absorbs vibration energy by utilizing the flow of oil in the annular cavity and the damping force generated by the gap between the baffles, improving dynamic balance and reducing noise; simultaneously, the sound-absorbing cotton layer attached to the annular sidewall of the fixed counterweight section further absorbs structurally transmitted noise, enhancing the overall quietness. These synergistic structural effects not only improve the smoothness and lifespan of the motor but also significantly reduce noise pollution, achieving efficient and reliable quiet performance.

[0010] The beneficial effects listed above are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other descriptive sections of this application. Attached Figure Description

[0011] A better understanding of various aspects of this disclosure will be achieved by reading the following detailed description in conjunction with the accompanying drawings. The positions, dimensions, and extents of the structures shown in the drawings, etc., do not always represent actual positions, dimensions, and extents. In the drawings:

[0012] Figure 1 This is a schematic diagram of the structure of one embodiment disclosed in this application.

[0013] Figure 2 This is a schematic diagram of the structure of one embodiment disclosed in this application from another perspective.

[0014] Figure 3 This is a schematic diagram of the structure of one embodiment of the present application in the state of oil damping separation.

[0015] Figure 4 This is a schematic diagram of the structure of the oil damping part in the angular state in one embodiment of this application. Detailed Implementation

[0016] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0017] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of certain features may be modified in the drawings.

[0018] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail; however, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0019] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0020] Example:

[0021] Referring to the accompanying drawings, this embodiment provides a liquid-balanced silent motor suitable for equipment with high requirements for noise and vibration control, such as air purifiers. The motor includes a housing, a stator, and a rotor 1. The housing adopts a structural design known in the field of motors. The stator is fixedly installed inside the housing, and the rotor 1 is rotatably inserted into the housing and electromagnetically engages with the stator. A balance counterweight assembly 2 is fixed on the rotor 1 and sleeved outside the housing. This assembly consists of a fixed counterweight part 201, an oil damping part 202, and a sound-absorbing cotton layer, achieving dynamic balance and noise suppression through a multi-level cooperative mechanism. The overall design aims to improve the smoothness and quietness of motor operation while extending its service life.

[0022] like Figure 1 The diagram shows a structural schematic of one embodiment of the motor disclosed in this application, clearly illustrating the overall layout of the motor, including the relative positions of the housing, rotor 1, and counterweight assembly 2. The fixed counterweight 201, as a basic balancing component, has a columnar structure, including a circular top 2011 and an annular sidewall 2012 extending vertically from the edge of the top 2011. It is fixed to the end of the rotor 1 by bolts or interference fit to compensate for the initial imbalance of the rotor 1 and reduce vibration. The fixed counterweight 201 is made of stainless steel or aluminum alloy to ensure sufficient mass density and mechanical strength. Its mass distribution is optimized by accurately calculating the dynamic balance requirements of the rotor 1, for example, by adding or removing materials to adjust the counterweight. The thickness of the annular sidewall 2012 is designed to be 2 mm to 5 mm to achieve a balance between weight and structural strength. During motor operation, the fixed counterweight 201 rotates at high speed with the rotor 1, generating centrifugal force to counteract the unbalanced torque, thereby achieving smooth operation.

[0023] like Figure 2 The diagram shown is a structural schematic diagram of an embodiment disclosed in this application from another perspective. It shows the connection details between the counterweight assembly 2 and the rotor 1, as well as their spatial distribution, from different angles, which helps to understand the assembly relationship of the components.

[0024] The oil damping part 202, as a dynamic damping component, has a ring-shaped structure and is fitted and fixed to the outer ring sidewall 2012 of the fixed counterweight part 201 by hot pressing or bonding. The oil damping part 202 forms an annular cavity filled with silicone oil or mineral oil, accounting for 60% to 80% of the cavity volume. The viscosity of the silicone oil is preferably 200 cSt to 400 cSt to maintain effective damping performance under high-speed rotation.

[0025] The oil damping part 202 includes a body 2021 and a sealing ring 2022. The body 2021 is made of metal or engineering plastic and has an annular groove 2023 with one open end. The sealing ring 2022 is made of rubber or silicone material, installed at the open end of the annular groove 2023, and achieves a reliable seal through an O-ring.

[0026] Eight to twelve baffles 2024 are evenly distributed circumferentially on the sealing ring 2023. A fitting gap of 0.1 mm to 0.5 mm is formed between the baffles 2024 and the inner wall of the annular groove 2023, thus forming multiple annular oil chambers interconnected through the gaps. This design utilizes the viscous flow of oil within the oil chambers and the shear damping force generated by the gaps between the baffles to dynamically absorb vibration energy.

[0027] When rotor 1 rotates, the oil circulates under the action of centrifugal force and baffle 2024, converting mechanical vibration into heat energy through viscous dissipation, thereby improving dynamic balance and reducing high-frequency noise.

[0028] It should be understood that, in this embodiment, the liquid-balanced silent motor achieves dynamic balance adjustment through a combination of a fixed counterweight 201 and an oil damping part 202. Specifically, the fixed counterweight 201 is mechanically fixed to the rotor to provide basic balance; the oil damping part 202 provides dynamic rebalancing. When the rotor 1 rotates, due to the centrifugal force, the oil flows in the annular cavity and tends to flow towards the lighter area of ​​the rotor 1, thereby automatically compensating for the imbalance and achieving dynamic balance.

[0029] like Figure 3 The diagram shown is a structural schematic of an embodiment of this application in the separated state of the oil damping section 202. Figure 4 The diagram shown is a structural schematic of the oil damping part 202 in an angular state in one embodiment of this application, illustrating the independent structure of the oil damping part 202 and facilitating understanding of its sealing and connection methods.

[0030] The sound-absorbing cotton layer, serving as an acoustic suppression component, is attached to the inner surface of the annular sidewall 2012 of the fixed counterweight part 201. It is made of porous polyurethane or glass wool and is tightly bonded using adhesive. The sound-absorbing cotton layer has a thickness of 3 mm to 8 mm and a porosity of 70% to 90% to balance sound absorption and space constraints. Its design aims to absorb broadband noise propagating through the structure by utilizing the material's own acoustic impedance matching characteristics, complementing the damping effect of the oil-damped part 202. During motor operation, the sound-absorbing cotton layer converts sound wave energy into heat energy through its porous structure, further reducing noise propagating through air and solids.

[0031] Overall, when the motor is working, the rotor 1 drives the counterweight assembly 2 to rotate, the fixed counterweight 201 provides static mass balance, the oil damping part 202 dynamically adjusts the vibration phase through oil flow and damping force, and the sound-absorbing cotton layer absorbs residual sound energy. The three work together to achieve efficient operation with low vibration and low noise.

[0032] In air purifier applications, this liquid-balanced silent motor, as the core component driving the fan, demonstrates superior performance. Upon startup, rotor 1 drives the counterweight assembly 2 to rotate smoothly at 1000 to 3000 revolutions per minute. The fixed counterweight 201 generates centrifugal force through precisely calculated mass distribution, effectively compensating for the initial imbalance of rotor 1, significantly reducing basic vibration, and preventing component wear and noise amplification caused by vibration. During high-speed rotation, the silicone oil in the annular cavity circulates under centrifugal force, dynamically absorbing high-frequency vibration energy through the shear damping force generated by the gaps in the baffles 2024, converting mechanical vibration into heat dissipation, reducing operating noise to below 30 decibels, ensuring that users can barely perceive any disturbance at night or in quiet environments. Simultaneously, the sound-absorbing cotton layer efficiently absorbs broadband residual noise through its porous structure, further suppressing sound waves propagating through the motor housing and improving overall quietness. Compared to traditional motors, this device achieves multi-level coordinated control, significantly reducing vibration and noise, improving energy efficiency and reliability, and extending the lifespan of the air purifier. In practical use, such as in home or office environments, users can enjoy a continuously quiet air purification experience, while the stable operation of the motor reduces maintenance needs, demonstrating significant technological advantages in energy conservation, environmental protection, and user experience.

[0033] In the specific embodiments of this application, for the sake of brevity and clarity, conventional structures, components, connection methods, or manufacturing processes known to those skilled in the art are not described in detail. These undisclosed contents, such as the selection of motor housing materials, the basic electromagnetic design of the stator and rotor, standard sealing methods, or common assembly techniques, all fall within the scope of common knowledge or existing technology known to those skilled in the art, and can be easily obtained and implemented through conventional engineering manuals, standards, or existing patent documents. Based on the teachings of this disclosure, and combined with their own professional knowledge and existing technology, those skilled in the art can implement the technical solutions of this application without excessive experimentation. Furthermore, these specific embodiments are merely preferred examples of this application, used for illustrative purposes, and are not intended to limit the scope of protection of this application. Any equivalent modifications, substitutions, or improvements based on this application, without departing from the core spirit of this application, should be considered to fall within the scope of the claims of this application.

Claims

1. A liquid-balanced silent motor, comprising a housing, a stator mounted within the housing, and a rotor rotatably inserted into the housing and cooperating with the stator, characterized in that, The rotor is fixed with a counterweight assembly sleeved on the outside of the housing. The counterweight assembly includes a fixed counterweight part and an oil damping part. The fixed counterweight part has a columnar structure, including a circular top and an annular sidewall extending vertically from the top edge. The fixed counterweight part is fixed to the rotor by mechanical connection. The oil damping part is annular, sleeved and fixed on the outside of the annular sidewall of the fixed counterweight part. The oil damping part forms an annular cavity inside, which is filled with oil occupying 60% to 80% of the cavity volume.

2. The liquid-balanced silent motor according to claim 1, characterized in that, The oil damping part includes a body and a sealing ring. The body is provided with an annular groove that is open at one end. The sealing ring is installed at the open end of the annular groove and achieves a sealing connection. Multiple baffles are erected on the sealing ring. The baffles and the inner wall of the annular groove form a fitting gap, so that the baffles and the annular groove cooperate to form multiple annular and interconnected oil chambers.

3. The liquid-balanced silent motor according to claim 1 or 2, characterized in that, A sound-absorbing cotton layer is attached to the inner sidewall of the fixed counterweight, and the sound-absorbing cotton layer is tightly attached to the inner surface of the annular sidewall.

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