Damping pad, fan assembly and extractor hood
Patent Information
- Application Number
- CN202522119698.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-09-30
AI Technical Summary
[0004]本实用新型的目的在于提供一种减振垫、风机组件及油烟机，在一定程度上缓解了现有固定刚度减振垫导致的减振效果不佳、低频共振或高频传导的技术问题
本实用新型提供的减振垫包括：第一连接部、双稳态梁、弹性复位件和第二连接部；双稳态梁位于第一连接部和第二连接部之间；双稳态梁的中间区域与第一连接部连接，双稳态梁的两端均与第二连接部连接；弹性复位件连接在双稳态梁和第二连接部之间，用于在双稳态梁朝向第二连接部所在方向形变后，对双稳态梁产生支撑力；在减振垫未受力状态下，双稳态梁的中间区域与第二连接部之间的距离大于其两端与第二连接部之间的距离；在减振垫所受到的压缩力达到阈值后，双稳态梁的中间区域与第二连接部之间的距离小于其两端与第二连接部之间的距离。
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Figure CN224923534U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a vibration damping pad, a fan assembly, and a range hood. Background Technology
[0002] As an important ventilation device in the kitchen, the range hood uses a motor to drive an impeller to quickly remove cooking fumes. The motor, as the core drive source of the entire system, generates vibrations during operation. These vibrations are transmitted to the entire machine through the casing and body, causing noise and resonance, affecting the user experience. Furthermore, prolonged operation may lead to structural fatigue, reducing product reliability and lifespan.
[0003] Currently, most mainstream range hoods use rubber vibration damping pads in their motor mounting structures to isolate the motor from the volute support, thereby reducing vibration transmission. However, the stiffness characteristics of rubber vibration damping pads are fixed parameters, which cannot meet the multi-condition vibration damping requirements of motors operating at multiple speeds (such as low speed, medium speed, and high speed). In particular, at some speeds, the vibration damping effect is poor, and low-frequency resonance or high-frequency transmission occurs. Utility Model Content
[0004] The purpose of this utility model is to provide a vibration damping pad, a fan assembly, and a range hood, which to a certain extent alleviates the technical problems of poor vibration damping effect, low-frequency resonance, or high-frequency transmission caused by existing fixed stiffness vibration damping pads.
[0005] In a first aspect, the present invention provides a vibration damping pad, comprising: a first connecting part, a bistable beam, an elastic reset member, and a second connecting part; The bistable beam is located between the first connecting part and the second connecting part; the middle region of the bistable beam is connected to the first connecting part, and both ends of the bistable beam are connected to the second connecting part; The elastic reset member is connected between the bistable beam and the second connection part, and is used to generate a supporting force on the bistable beam after the bistable beam deforms in the direction of the second connection part; When the damping pad is not under stress, the distance between the middle region of the bistable beam and the second connection is greater than the distance between its two ends and the second connection; after the compressive force on the damping pad reaches the threshold, the distance between the middle region of the bistable beam and the second connection is less than the distance between its two ends and the second connection.
[0006] Furthermore, the bistable beam is configured such that when the displacement of the middle region of the bistable beam relative to the initial position toward the second connection is x1, the stiffness of the bistable beam switches from positive stiffness to negative stiffness; when the displacement of the middle region of the bistable beam relative to the initial position toward the second connection is x2, the stiffness of the bistable beam switches from negative stiffness to positive stiffness, where x2 is greater than x1. The elastic reset member is configured such that when the displacement of the intermediate region of the bistable beam relative to the initial position toward the second connection is between x1 and x2, the sum of the stiffness of the elastic reset member and the stiffness of the bistable beam is zero.
[0007] Furthermore, the bistable beam is a cosine beam.
[0008] Furthermore, the bistable beam includes a connecting block, with a first cosine beam arm and a second cosine beam arm symmetrically connected to opposite ends of the connecting block; the top surface of the connecting block is connected to the bottom surface of the first connecting part; the outer ends of the first cosine beam arm and the outer ends of the second cosine beam arm are each provided with a connecting column extending toward the second connecting part and connected to the second connecting part. The thickness of both the first and second cosine beam arms is t; The number of first cosine beam arms and second cosine beam arms are both two; the two first cosine beam arms are spaced apart along the direction from the first connecting part to the second connecting part, and the gap distance between the two first cosine beam arms is h1, h1 / t=6.
[0009] Furthermore, the elastic reset element is a spring.
[0010] Furthermore, the bistable beam is provided with a first protrusion protruding toward the second connecting part; the top surface of the second connecting part is provided with a second protrusion protruding toward the bistable beam, one end of the spring is inserted into the first protrusion, and the other end is inserted into the second protrusion.
[0011] Furthermore, a first through hole is provided on the first connecting part; a second through hole is provided on the bistable beam, the axis of the second through hole coincides with the center line of the bistable beam; a third through hole is provided on the second connecting part; the first through hole, the second through hole and the third through hole are coaxial; The vibration damping pad also includes bolts, which can pass through the first through hole, the second through hole and the third through hole to lock the vibration damping pad between the motor and the motor bracket.
[0012] Furthermore, the second through hole penetrates the first protrusion; the third through hole penetrates the second protrusion, so that the threaded part passing through the second through hole and the third through hole passes through the spring. Secondly, the present invention provides a fan assembly including a motor, a motor bracket and the aforementioned vibration damping pad, wherein the vibration damping pad is connected between the motor and the motor bracket.
[0013] Thirdly, the present invention provides a range hood that includes the aforementioned vibration damping pad.
[0014] This utility model has at least the following advantages or beneficial effects: The vibration damping pad provided by this utility model includes: a first connecting part, a bistable beam, an elastic reset member, and a second connecting part; the bistable beam is located between the first connecting part and the second connecting part; the middle region of the bistable beam is connected to the first connecting part, and both ends of the bistable beam are connected to the second connecting part; the elastic reset member is connected between the bistable beam and the second connecting part, and is used to generate a supporting force on the bistable beam after it deforms in the direction of the second connecting part; when the vibration damping pad is not under stress, the distance between the middle region of the bistable beam and the second connecting part is greater than the distance between its two ends and the second connecting part; after the compressive force on the vibration damping pad reaches a threshold, the distance between the middle region of the bistable beam and the second connecting part is less than the distance between its two ends and the second connecting part.
[0015] In this embodiment, a bistable beam with negative stiffness is used in parallel with an elastic restoring member with positive stiffness. Near the system's equilibrium position, the negative stiffness of the bistable beam can precisely offset some or most of the positive stiffness of the elastic restoring member, thereby achieving extremely low dynamic equivalent stiffness near the equilibrium point while maintaining sufficient static load-bearing capacity and structural stiffness. This characteristic significantly reduces the natural frequency of the damping pad (far lower than that of traditional linear vibration isolators with equivalent static load-bearing capacity), greatly widening the lower limit of the effective vibration isolation frequency band. This allows it to maintain excellent vibration isolation performance (i.e., high transmission loss) over a wider frequency range including even lower frequencies (e.g., a range significantly lower than the initial vibration isolation frequency of traditional structures). Attached Figure Description
[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 A schematic diagram of the vibration damping pad provided in an embodiment of this utility model; Figure 2 A schematic diagram of a bistable beam for a vibration damping pad provided in an embodiment of this utility model; Figure 3 A schematic diagram of a fan assembly provided in an embodiment of this utility model; Figure 4 A schematic diagram of the compression of the vibration damping pad of the fan assembly provided in an embodiment of this utility model; Figure 5 The restoring force curve of the cosine beam of the vibration damping pad provided in this embodiment of the utility model; Figure 6 The restoring force curve of the vibration damping pad provided in the embodiment of this utility model.
[0018] Icons: 1-First connecting part; 11-First through hole; 2-Second connecting part; 21-Connecting post; 22-Second protrusion; 3-Bistable beam; 31-Connecting block; 311-First protrusion; 32-First cosine beam arm; 33-Second cosine beam arm; 4-Spring; 5-Motor; 6-Motor bracket; 10-Vibration damping pad. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0023] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0025] like Figure 1 and Figure 2 As shown, the vibration damping pad provided by this utility model can be applied to a range hood, that is, it is installed between the motor and the motor bracket to reduce noise.
[0026] The vibration damping pad includes: a first connecting part 1, a bistable beam 3, an elastic reset member, and a second connecting part 2.
[0027] The first connecting part 1 and the second connecting part 2 can both be plate-shaped, and the bistable beam 3 is located between the first connecting part 1 and the second connecting part 2.
[0028] like Figure 2 As shown, in this embodiment, the bistable beam 3 is a cosine beam. Specifically, the bistable beam 3 includes a connecting block 31 located in the middle. The connecting block 31 is symmetrically connected to a first cosine beam arm 32 and a second cosine beam arm 33 at its two ends. The span of the cosine beam (the distance between the outer ends of the first cosine beam arm 32 and the second cosine beam arm 33) is L. The thickness of both the first cosine beam arm 32 and the second cosine beam arm 33 is t. The height of the cosine beam is h. There are two first cosine beam arms 32 and two cosine beam arms 33. Along the direction from the first connecting part 1 to the second connecting part 2, the two first cosine beam arms 32 are spaced apart, and the gap distance between the two first cosine beam arms 32 is h1.
[0029] The shape equation of the cosine beam is: And satisfying h1 / t=6, thus providing negative stiffness to the cosine beam.
[0030] The top surface of the connecting block 31 is connected to the bottom surface of the first connecting part 1. The outer ends of the first cosine beam arm 32 and the second cosine beam arm 33 are each provided with a connecting post 21 extending towards and connecting to the second connecting part 2. There are two connecting posts 21, symmetrically arranged on the left and right sides of the connecting block 31. Each of the two vertically spaced first cosine beam arms 32 is connected to one connecting post 21 on one side.
[0031] The middle region of the bistable beam 3 is connected to the first connecting part 1, and both ends of the bistable beam 3 are connected to the second connecting part 2. An elastic reset member is connected between the bistable beam 3 and the second connecting part 2 to generate a supporting force on the bistable beam 3 after it deforms in the direction of the second connecting part 2. In this embodiment, the elastic reset member is a spring 4. In other feasible solutions, the elastic reset member can also be other elastic members, such as metal spring sheets.
[0032] When the damping pad is not under stress, the bistable beam 3 has an upward convex shape, such as... Figure 1 As shown, the distance between the middle region of the bistable beam 3 and the second connecting part 2 is greater than the distance between its two ends and the second connecting part 2; as the compressive force applied between the first connecting part 1 and the second connecting part 2 increases, after the compressive force on the damping pad reaches the threshold, the bistable beam 3 deforms and switches to a downward convex shape, as shown. Figure 2 As shown, the distance between the middle region of the bistable beam 3 and the second connection part 2 is smaller than the distance between its two ends and the second connection part 2, and the stiffness attribute changes from positive stiffness to negative stiffness.
[0033] In this embodiment, a bistable beam 3 with negative stiffness is used in parallel with an elastic restoring member with positive stiffness. Near the system's equilibrium position, the negative stiffness characteristic of the bistable beam 3 can precisely offset part or most of the positive stiffness of the elastic restoring member, thereby achieving extremely low dynamic equivalent stiffness near the equilibrium point while maintaining sufficient static load-bearing capacity and structural stiffness. This characteristic significantly reduces the natural frequency of the damping pad (far lower than that of a traditional linear vibration isolator with equivalent static load-bearing capacity), greatly widening the lower limit of the effective vibration isolation frequency band, enabling it to have excellent vibration isolation performance (i.e., high transmission loss) over a wider frequency range including lower frequencies (e.g., a range significantly lower than the initial vibration isolation frequency of traditional structures).
[0034] like Figure 1 As shown, in order to prevent the spring 4 from detaching from the damping pad, the bistable beam 3 is provided with a first protrusion 311 protruding toward the second connecting part 2; the top surface of the second connecting part 2 is provided with a second protrusion 22 protruding toward the bistable beam 3. One end of the spring 4 is inserted into the first protrusion 311 and the other end is inserted into the second protrusion 22, thereby limiting the two ends of the spring 4 and making the spring 4 more stable.
[0035] The first connecting part 1 is provided with a first through hole 11; the bistable beam 3 is provided with a second through hole, the axis of which coincides with the center line of the bistable beam 3; the second connecting part 2 is provided with a third through hole; the first through hole 11, the second through hole, and the third through hole are coaxial. The vibration damping pad also includes bolts, which can pass through the first through hole 11, the second through hole, and the third through hole to lock the vibration damping pad between the motor 5 and the motor bracket 6.
[0036] like Figure 3 and Figure 4 As shown, during installation, the first connecting part 1 contacts the panel of the motor 5 mounting slot, and the second connecting part 2 contacts the motor bracket 6 of the volute. First, bolts are passed through the first through hole 11, the second through hole, and the third through hole, and then threaded onto the motor bracket 6 (the motor bracket 6 has screw holes corresponding to the bolts). During the rotation of the bolts, the vibration damping pads are compressed by a compression distance of x. d In other words, at least x meters of space needs to be reserved for vibration damping pads. d The compressed form of .
[0037] The second through hole penetrates the first protrusion 311; the third through hole penetrates the second protrusion 22, so that the threaded part passing through the second through hole and the third through hole passes through the spring 4. The bolt passes through the spring 4, further limiting the spring 4 so that the spring 4 will not detach from the damping pad before the damping pad is damaged.
[0038] Preferred, such as Figure 5 As shown, the bistable beam 3 is configured such that when the displacement of the middle region of the bistable beam 3 relative to the initial position toward the second connecting part 2 is x1, the stiffness of the bistable beam 3 switches from positive stiffness to negative stiffness; when the displacement of the middle region of the bistable beam 3 relative to the initial position toward the second connecting part 2 is x2, the stiffness of the bistable beam 3 switches from negative stiffness to positive stiffness, and x2 is greater than x1; the elastic reset member is configured such that when the displacement of the middle region of the bistable beam 3 relative to the initial position toward the second connecting part 2 is between x1 and x2, the sum of the stiffness of the elastic reset member and the stiffness of the bistable beam 3 is zero, and the stiffness is completely canceled out between position x1 and position x2.
[0039] The restoring force curve of a cosine beam consists of three linear stiffness regions. The stiffness K1 of the first stiffness region, the stiffness K2 of the second stiffness region, and the stiffness K3 of the third stiffness region are respectively expressed as follows:
[0040]
[0041]
[0042] In the formula, I1 is the moment of inertia of the cosine beam, L is the span of the cosine beam, and E1 is the elastic modulus of the cosine beam.
[0043] The x-coordinates of the boundary points x1 and x2 of the stiffness region are represented as follows: , ,
[0044] like Figure 6As shown, the vibration damping pad is composed of a cosine beam and spring 4 connected in parallel. Between x1 and x2, the cosine beam provides negative stiffness, and spring 4 provides positive stiffness. The restoring force of the parallel structure can be expressed as the sum of the forces of spring 4 and the cosine beam:
[0045] In the formula F1 is the restoring force of the vibration damping pad, F2 is the restoring force of the cosine beam, and F2 is the restoring force of spring 4.
[0046] To achieve zero stiffness, the stiffness coefficient of spring 4 is... Should meet:
[0047] The x1-x2 interval in the diagram represents the zero-stiffness range of the vibration damping pad, which is the designed working range. Therefore, the compression amount x of the vibration damping pad during installation is... d It should satisfy: x1≤x d ≤h.
[0048] The fan assembly provided by this utility model includes a motor, a motor bracket, and the aforementioned vibration damping pad, with the vibration damping pad connected between the motor and the motor bracket.
[0049] Applying the aforementioned vibration damping pads within the fan assembly can effectively suppress the propagation path of broadband (especially low-frequency) vibration energy generated by the motor 5 during operation to the machine structure (such as the housing and air duct). This not only effectively reduces the overall operating noise (significantly improving quietness), but also avoids the instability risks such as swaying and sinking caused by traditional low-stiffness vibration isolators, because the vibration damping pads maintain good static support stiffness and stability even at low stiffness. This fundamentally improves the overall structural stability and long-term operational reliability of the range hood.
[0050] The range hood provided by this utility model includes the aforementioned vibration damping pad.
[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A vibration damping pad, characterized in that, include: First connecting part (1), bistable beam (3), elastic reset member and second connecting part (2); The bistable beam (3) is located between the first connecting part (1) and the second connecting part (2); the middle region of the bistable beam (3) is connected to the first connecting part (1), and both ends of the bistable beam (3) are connected to the second connecting part (2); The elastic reset member is connected between the bistable beam (3) and the second connecting part (2) and is used to generate a supporting force on the bistable beam (3) after the bistable beam (3) deforms in the direction of the second connecting part (2); When the damping pad is not under stress, the distance between the middle region of the bistable beam (3) and the second connecting part (2) is greater than the distance between its two ends and the second connecting part (2); after the compressive force on the damping pad reaches the threshold, the distance between the middle region of the bistable beam (3) and the second connecting part (2) is less than the distance between its two ends and the second connecting part (2).
2. The vibration damping pad according to claim 1, characterized in that, The bistable beam (3) is configured such that when the displacement of the middle region of the bistable beam (3) relative to the initial position toward the second connecting part (2) is x1, the stiffness of the bistable beam (3) switches from positive stiffness to negative stiffness; when the displacement of the middle region of the bistable beam (3) relative to the initial position toward the second connecting part (2) is x2, the stiffness of the bistable beam (3) switches from negative stiffness to positive stiffness, and x2 is greater than x1. The elastic reset member is configured such that when the displacement of the middle region of the bistable beam (3) relative to the initial position toward the second connection (2) is between x1 and x2, the sum of the stiffness of the elastic reset member and the stiffness of the bistable beam (3) is zero.
3. The vibration damping pad according to claim 1, characterized in that, The bistable beam (3) is a cosine beam.
4. The vibration damping pad according to claim 3, characterized in that, The bistable beam (3) includes a connecting block (31), and a first cosine beam arm (32) and a second cosine beam arm (33) are symmetrically connected to opposite ends of the connecting block (31); the top surface of the connecting block (31) is connected to the bottom surface of the first connecting part (1); the outer ends of the first cosine beam arm (32) and the outer ends of the second cosine beam arm (33) are each provided with a connecting column (21) extending toward the second connecting part (2) and connected to the second connecting part (2); The thickness of the first cosine beam arm (32) and the second cosine beam arm (33) is both t; The number of the first cosine beam arm (32) and the second cosine beam arm (33) are both two; the two first cosine beam arms (32) are spaced apart along the direction from the first connecting part (1) to the second connecting part (2), and the gap distance between the two first cosine beam arms (32) is h1, h1 / t=6.
5. The vibration damping pad according to claim 1, characterized in that, The elastic reset element is a spring (4).
6. The vibration damping pad according to claim 5, characterized in that, The bistable beam (3) is provided with a first protrusion (311) protruding toward the second connecting part (2); the top surface of the second connecting part (2) is provided with a second protrusion (22) protruding toward the bistable beam (3), one end of the spring (4) is inserted into the first protrusion (311), and the other end is inserted into the second protrusion (22).
7. The vibration damping pad according to claim 6, characterized in that, The first connecting part (1) is provided with a first through hole (11); the bistable beam (3) is provided with a second through hole, the axis of the second through hole coincides with the center line of the bistable beam (3); the second connecting part (2) is provided with a third through hole; the first through hole (11), the second through hole and the third through hole are coaxial; The vibration damping pad also includes bolts that can pass through the first through hole (11), the second through hole and the third through hole to lock the vibration damping pad between the motor (5) and the motor bracket (6).
8. The vibration damping pad according to claim 7, characterized in that, The second through hole penetrates the first protrusion (311); the third through hole penetrates the second protrusion (22) so that the threaded part passing through the second through hole and the third through hole passes through the spring (4).
9. A fan assembly, characterized in that, It includes a motor, a motor bracket, and a vibration damping pad as described in any one of claims 1-8, wherein the vibration damping pad is connected between the motor and the motor bracket.
10. A range hood, characterized in that, Includes the vibration damping pad as described in any one of claims 1-9.