Elevator contactor vibration noise reduction device

Abstract

The utility model discloses an elevator contactor vibration noise reduction device relates to elevator manufacturing and noise control technical field. The device is including by bottom box and apron constitute the silence cabin, and the silence cabin is through the damping column and elevator control cabinet side plate flexible connection, and its inside is through the soft connection structure fixed contactor. The soft connection structure is by base, spacing cotton and spacing support composition, realizes the flexible spacing and vibration damping to contactor, and the silence cabin inner wall is pasted and covers the sound absorption cotton, and is equipped with the stepped sealing structure between apron and bottom box, and the cable import and export place sets up the binding hole of covering sound insulation cotton, forms multiple seals. The utility model discloses through " multistage vibration isolation - cavity sound absorption - gap sealing " synergistic effect, effectively inhibits contactor vibration transmission and noise spread, can make control cabinet noise steady drop to 50 decibels below, and significantly improves elevator control system reliability, realizes stable noise reduction.

Description

Technical Field

[0001] This utility model relates to the field of elevator manufacturing and noise control technology, specifically to a contactor vibration and noise comprehensive control device for elevator control cabinets. Background Technology

[0002] The elevator control cabinet is the core of the elevator system. The contactor, a key electrical actuator, generates vibrations of 30-50Hz and noise of 60-80 decibels during engagement and disengagement due to sudden electromagnetic force changes, core collisions, and contact impacts. This vibration is transmitted through the cabinet structure, easily leading to loose connections in other components, fatigue fracture of electronic component solder joints, and poor contact in connectors, seriously threatening the reliability of elevator operation. Simultaneously, the noise propagates through the building structure to surrounding indoor spaces, especially in residential buildings, hospitals, and other places with stringent acoustic requirements, not only affecting user experience but also failing to meet the limits set by the "Code for Sound Insulation Design of Civil Buildings."

[0003] Currently, conventional countermeasures for contactor noise in the industry have significant limitations. Existing technologies typically focus on vibration damping and noise reduction around the contactor itself. Firstly, optimizing the contactor's structure (such as using soft magnetic materials or adding buffer pads) has noise reduction effectiveness limited by electrical performance and cost, and is not applicable to existing traditional models. Secondly, overall soundproofing of the control cabinet (such as applying sound-absorbing cotton or increasing sealing) can reduce noise propagation to some extent, but it cannot suppress vibration at its source and may lead to increased cabinet size and maintenance inconvenience. For example, patent CN212334280U discloses a contactor noise reduction device, a machine-room-less elevator control cabinet, and a machine-room-less elevator, which achieves noise absorption by setting up vibration damping components and sound-absorbing boxes. Existing technologies lack a dedicated device that can simultaneously address both "vibration source control" and "noise propagation path blocking," and is modular and easy to install. Utility Model Content

[0004] The purpose of this utility model is to provide a vibration noise reduction device for elevator contactors. By placing the contactor in a soundproof chamber and connecting it to the side plate of the elevator control cabinet with a mounting base and vibration damping column, the resonance caused by connecting to the rear side of the control cabinet in the traditional connection method is avoided, thus greatly reducing noise generation. A further purpose is to optimize the fixing method of the contactor in the soundproof chamber and improve the sealing method of the inlet and outlet of the soundproof chamber, thereby improving the sealing effect of the soundproof chamber and effectively blocking the propagation of vibration source energy.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an elevator contactor vibration noise reduction device, comprising a soundproof chamber composed of a base box and a cover plate. L-shaped plates are provided on the left and right sides of the top of the soundproof chamber, and are flexibly connected and fixed to the side plates of the elevator control cabinet via vibration damping columns. A contactor is installed inside the soundproof chamber, and the contactor is fixed inside the base box via a flexible connection structure. Sound-absorbing cotton is adhered to the inner walls of both the base box and the cover plate, and the mounting surfaces of the cover plate and the base box have a stepped sealing structure.

[0006] Preferably, the vibration damping column is eccentrically positioned on the shell of the soundproof enclosure. This eccentric design ensures that the soundproof enclosure fits tightly against the control cabinet side panel under gravity, reducing swaying. Vibration-absorbing and sound-insulating cotton is also adhered to the rear of the soundproof enclosure to prevent rigid contact with the control cabinet shell, further blocking the vibration transmission path.

[0007] Preferably, one end of the vibration damping column is pressed into or bonded to the mounting hole in the L-shaped plate, while the other end is interference-fitted to the mounting hole on the side plate of the elevator control cabinet. This connection method ensures both ease and stability of installation, and by changing the system stiffness, it effectively avoids resonance by ensuring that the natural frequency of the entire silent cabin system avoids the working vibration frequency of the contactor.

[0008] Preferably, the flexible connection structure includes a base one, a base two, and limiting cotton. Base one and base two are connected by bolts and jointly support the contactor. The bottom of base one has four planes, which allow it to sit evenly on the sound-absorbing cotton at the bottom of the box, avoiding stress concentration and achieving initial vibration isolation.

[0009] Preferably, the limiting cotton has notches and protrusions, and is fixed to the base box by a limiting bracket. The limiting bracket has holes that mate with the protrusions of the limiting cotton, and is connected to the corresponding fixing holes of the base box by bolts. This structure flexibly limits the rigid vibrating body composed of the contactor and its base within a predetermined range, allowing micro-vibrations to be absorbed by the sound-absorbing cotton while preventing excessive displacement due to gravity or vibration, thus achieving a balance between damping and limiting.

[0010] Preferably, the base box is formed into a fixing seat and a wire fixing port through an integral bending molding process. Several open wire tying holes are opened on the bent edge of the wire fixing port to facilitate the arrangement and fixing of wires, and sound insulation cotton is covered on the surface of the bent edge to effectively block the noise leakage channels at the cable inlet and outlet.

[0011] Preferably, the bent edges on both sides of the cover plate are higher than the mounting surface with the bottom box, forming a stepped sealing structure. This design effectively blocks noise from propagating through the mounting gap between the cover plate and the bottom box, improving overall sound insulation performance.

[0012] Preferably, the inner wall of the cover plate is entirely covered with sound-absorbing cotton, and the shape of the sound-absorbing cotton is adapted to the contour of the inner wall of the cover plate, ensuring efficient absorption of cabin noise.

[0013] Beneficial Effects: This utility model achieves systematic control of contactor vibration and noise through a synergistic design of multi-stage vibration reduction and multiple noise reduction methods. Firstly, by changing the mounting surface of the silencing chamber and using vibration-damping columns for connection, resonance with the cabinet is structurally avoided. Secondly, the contactor's flexible connection fixing method blocks the transmission of vibration energy at its source. Thirdly, the enclosed silencing chamber, combined with internal sound-absorbing cotton and external stepped seals and wire port seals, constitutes a highly efficient noise isolation space. This device has a compact structure, facilitating installation and maintenance within the limited space of the control cabinet. It not only significantly reduces the overall noise of the control cabinet (stable below 50 decibels) but also improves the long-term operational reliability of the elevator control system by suppressing vibration transmission. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the internal soft connection structure of the soundproof cabin of this utility model.

[0016] Figure 3 This is a schematic diagram of the silent cabin bottom box component of this utility model.

[0017] Figure 4 This is a schematic diagram of the silent cabin cover component of this utility model.

[0018] Figure 5 This is a schematic diagram of the complete structure of the silent cabin of this utility model.

[0019] In the diagram: 1-Silent chamber, 2-Base box, 3-Cover plate, 4-Mounting base, 5-Vibration damping column, 6-Contaminator, 7-Sound absorbing cotton, 8-Vibration absorbing and sound insulation cotton, 9-Base one, 10-Base two, 11-Limiting cotton, 12-Bolt, 13-Limiting bracket, 14-Fixing base, 15-Wire fixing port, 16-Open wire tying hole, 17-Sound insulation cotton. Detailed Implementation

[0020] The core design concept of this utility model for an elevator contactor vibration and noise reduction device lies in constructing a silent chamber that integrates "vibration isolation" and "noise containment." This device overcomes the limitations of existing technologies that only address the issue from a single dimension (such as improving only the contactor's internal structure or only soundproofing the cabinet). By altering the installation interface to avoid resonance, introducing multi-level soft connections to dampen vibration sources, and designing multiple seals to eliminate noise, it achieves synergistic management of contactor vibration and noise. The following will combine... Figures 1 to 5The paper provides a detailed and in-depth explanation of the various components, connections, working mechanisms, and synergistic effects of this device.

[0021] like Figure 1 and Figure 5 As shown, the overall structure of this utility model uses the soundproof chamber 1 as the carrier. The soundproof chamber 1 is formed by a base box 2 and a cover plate 3 detachably connected by bolts, creating a highly sealed cavity. This split design not only facilitates the installation and maintenance of internal components but also provides convenience for possible subsequent component replacement or upgrades. The installation method of the soundproof chamber 1 is the primary innovation of this project, fundamentally solving the resonance amplification problem inherent in traditional installation methods. In traditional practice, engineers are accustomed to fixing such auxiliary devices to a thin plate with a large area on the rear side of the control cabinet. However, based on the classical thin plate vibration theory, the natural frequency of a rectangular thin plate with four fixed sides is closely related to the plate size, material, and boundary conditions when subjected to periodic excitation. The rear plate of the elevator control cabinet is usually a steel plate with a length of 1.2m, a width of 0.4m, and a thickness of 1.5mm. Its calculated fundamental frequency falls exactly within the range of the contactor's operating vibration frequency (30~50Hz), which easily induces structural resonance, leading to an "acoustic-vibration coupling" effect, which amplifies noise and exacerbates structural fatigue. This invention changes the traditional installation approach by shifting the installation interface from the easily resonant rear thin plate to the control cabinet side plate, which has greater rigidity and a higher natural frequency. This change is not a simple displacement, but a complete redesign of the vibration transmission path of the entire system. Specifically, L-shaped mounting seats 4 are installed on the left and right sides of the top of the silent chamber 1 through high-precision welding or integral molding with the chamber body. The mounting seats 4 have pre-machined high-precision mounting holes for fixing the core vibration isolation element damping column 5.

[0022] As a key elastic element connecting the soundproof cabin and the elevator control cabinet side panel, the performance of the vibration damping column 5 directly determines the vibration isolation efficiency of the entire system. Its material is preferably polyurethane or neoprene rubber, which has high internal resistance, excellent fatigue life, and good environmental stability. Its Shore hardness is precisely calculated and experimentally verified, typically between 50A and 70A. This hardness range represents a perfect balance between supporting the overall weight of the soundproof cabin (including internal components) and providing optimal vibration isolation. Too low a hardness may lead to unstable support and cabin swaying; too high a hardness will reduce the vibration isolation effect. One end of the vibration damping column 5 is securely fixed to the hole in the mounting base 4 using an interference fit or high-strength adhesive, while the other end is connected to the pre-drilled mounting hole on the elevator control cabinet side panel using the same interference fit. This installation method, combining a rigid shell with elastic elements, is based on profound mechanical principles: the introduction of vibration damping columns significantly reduces the connection stiffness K between the entire silent cabin-contactor system and the cabinet, allowing the system's natural frequency to be redesigned and effectively reduced. This reliably avoids the main excitation frequency range of 30-50Hz during contactor operation, eliminating the conditions for structural resonance at the root of dynamics. This is the first and crucial step in achieving efficient noise reduction. Furthermore, the vibration damping columns 5 are eccentrically arranged on the shell of the silent cabin 1. This design cleverly utilizes the silent cabin's own gravitational moment, allowing it to naturally apply a stable overturning pressure to the control cabinet side panel after installation. This greatly suppresses and reduces the overall shaking of the silent cabin that may be caused by the impact of elevator start-stop and vibration during operation, ensuring the stable operation and long-term reliability of the device under complex working conditions.

[0023] Based on the main path vibration isolation achieved through the vibration damping column 5, to further block the near-field transmission of vibration energy through the rear wall of the soundproof cabin to the control cabinet side panel (i.e., the "sound bridge" effect), this invention also tightly adheres a layer of high-performance composite vibration-absorbing and sound-insulating cotton 8 to the rear outer wall of the bottom box 2 of the soundproof cabin 1. This vibration-absorbing and sound-insulating cotton 8 is typically composed of a high-density rubber-based damping material (used to dissipate broadband vibration energy) and a closed-cell acoustic foam material (used to isolate airborne sound propagation). After the soundproof cabin 1 is installed in place via the vibration damping column 5, this layer of vibration-absorbing and sound-insulating cotton 8 will form a tight elastic contact with the control cabinet side panel, creating a highly efficient secondary vibration isolation and sound insulation layer. It not only further attenuates residual vibrations transmitted through the soundproof cabin shell but also effectively prevents noise inside the soundproof cabin from directly radiating to the control cabinet side panel through the rear wall, achieving dual blocking of vibration and noise. Together with the vibration damping column 5, it constitutes a composite vibration isolation system combining active and passive vibration isolation.

[0024] like Figure 2As shown, after completing the external vibration isolation design, the interior of the silencing chamber 1 is another key area for achieving "vibration source blocking". The contactor 6, as the main source of vibration and noise, is fixed within the chamber, directly determining how much vibration energy is transmitted to the silencing chamber shell. This invention employs a soft-connection limiting structure. This structure mainly consists of base 1 9, base 2 10, limiting cotton 11, and limiting bracket 13 working together. Base 1 9 and base 2 10 are typically made of high-strength engineering plastics (such as POM or reinforced nylon) or aluminum alloy through precision machining. They are connected by bolts 12, forming a stable and lightweight platform to support the contactor 6. It is particularly noteworthy that the bottom of base 1 9 is not designed as a single large flat surface, but rather has four small, raised surfaces at the same height. This ingenious design allows it to sit evenly on the bottom layer of sound-absorbing cotton 7 laid inside the base box 2 in a four-point support configuration. This point-contact method minimizes the contact area with the sound-absorbing cotton, effectively avoiding stress concentration and ensuring that the weight of the contactor is evenly distributed. It also achieves the initial "soft contact" and preliminary vibration isolation between the contactor and the soundproof cabin shell, confining most of the low-frequency vibration energy within the contact interface between the base and the sound-absorbing cotton. To prevent excessive displacement, sliding, or even overturning of the contactor 6 and its base in the soft-connection state due to acceleration / deceleration inertial forces, electromagnetic impacts, or continuous vibrations during elevator operation, which could lead to safety hazards or loosening of connecting cables, this invention incorporates a limiting mechanism. The limiting cotton 11 is made of polyurethane foam or microporous rubber material with certain compressive strength, high resilience, and durability. Its shape is precisely calculated, and it has notches that perfectly match the shape of the base assembly 9 and 10, securely encasing and accommodating the entire base assembly. The precisely fitted limiting bracket 13 is typically made of galvanized steel sheet through stamping and bending, possessing sufficient mechanical strength, and has positioning holes that precisely correspond to the protrusions of the limiting cotton. During installation, the protrusions of the limiting cotton 11 embed into the holes of the limiting bracket 13 for initial positioning, while the limiting bracket 13 itself achieves final rigid connection with the pre-set fixing threaded holes on the wall of the base box 2 via bolts. The working mechanism of this limiting mechanism is extremely ingenious: it does not completely lock the base assembly like a traditional clamp, but provides a limited and flexible movement boundary for the contactor 6 and its base through the elastic deformation of the limiting cotton 11. This allows the micro-vibrations generated by the contactor 6 to be effectively absorbed and damped by the bottom sound-absorbing cotton 7, and the vibration energy is converted into heat energy through multiple reflections and friction; at the same time, the mechanism strictly constrains its large displacement movement in any direction, perfectly realizing the design philosophy of "flexible limiting, rigid constraint", ensuring excellent vibration isolation and sound absorption effects while uncompromisingly guaranteeing the safety and long-term operational reliability of the equipment.

[0025] This utility model incorporates meticulous, multi-layered, and comprehensive sealing designs in the three most prone to sound leakage areas: the shell structure of the soundproof chamber, the cable inlet and outlet, and the seams of the cover plate. For example... Figure 3 As shown, the base box 2, as the basic structural component of the soundproof cabin, is made of high-quality galvanized steel sheet and manufactured using a modern precision integrated bending forming process. This process not only has high production efficiency and controllable costs, but more importantly, it avoids thermal deformation, residual stress, and potential cold welds that may occur during welding, ensuring the overall strength, rigidity, and dimensional accuracy of the structure, eliminating the possibility of abnormal noise or leakage due to structural defects from the manufacturing source. The base box 2 has an integrally formed mounting base 14 for installing internal components, as well as the crucial wire fixing port 15. Innovatively, several open wire tying holes 16 are opened on the bent edge of the wire fixing port 15. This open design fully considers the convenience of on-site construction. Compared with traditional closed round holes, it greatly facilitates the introduction, arrangement, classification, binding, and subsequent maintenance and repair of multiple wires of different thicknesses, solving a major pain point on the construction site. However, the open design also brings a greater risk of sound leakage. To address the issues of "sound bridges" and sound leakage at cable inlets and outlets, a layer of highly elastic, well-sealed closed-cell sound-absorbing cotton 17 is applied to the surfaces of these bends and around the open cable tie holes 16. Once all cables are neatly secured in their respective cable tie holes 16 with nylon cable ties, this layer of sound-absorbing cotton 17, due to its elasticity, tightly wraps and compresses each cable, effectively filling the gaps between all cables and the metal hole walls, forming an elastic sealing barrier that completely blocks this most common and difficult-to-manage noise leakage channel.

[0026] like Figure 4 As shown, the cover plate 3, serving as the "door" of the soundproof cabin, also plays a crucial role in its sealing performance. Its inner wall is entirely covered with sound-absorbing cotton 7 of the same type and thickness as that inside the base box, forming a complete sound-absorbing cavity together with the sound-absorbing layer inside the base box. This effectively absorbs cabin noise without any blind spots, reducing reverberation noise. At the assembly interface between the cover plate 3 and the base box 2, this invention designs a highly efficient stepped sealing structure. Specifically, the height of the bent edges on both sides of the cover plate 3 is intentionally increased, so that when closed, its edges can exceed the ordinary joint surface of the upper edge of the base box 2, forming an interlocking, stepped interface. This structure is not a simple planar compression; it significantly increases the propagation path of airborne noise through the joint and increases the resistance to sound wave propagation due to the sudden expansion and contraction of the channel, similar in principle to a labyrinth seal. Once the cover plate 3 is evenly fastened to the bottom box 2 by multiple bolts, even with minor manufacturing tolerances or deformation after long-term use, this stepped structure can effectively block sound waves from escaping directly from the joint by relying on its geometric shape. Compared with traditional flat butt sealing, its sound insulation performance in the mid-to-high frequency range is significantly improved.

[0027] In summary, the complete workflow and collaborative noise reduction mechanism of this utility model are as follows: When the elevator is running and the contactor 6 engages or disengages, the strong mechanical vibration and electromagnetic noise it generates are first buffered and isolated by the soft connection structure below it. The vibration energy is dispersed and transmitted to the sound-absorbing cotton 7 in the bottom box through the four support points of the base 9. This layer of sound-absorbing cotton acts as an elastic support to attenuate low-frequency vibrations, and its porous fiber structure converts sound energy into heat energy through air friction, achieving the first sound absorption. When the remaining vibration energy attempts to be transmitted outward through the shell of the soundproof cabin 1, it is first further consumed (damped vibration reduction) by the composite vibration-absorbing and sound-insulating cotton 8 pasted at the rear of the soundproof cabin. Then, when the energy is transmitted to the vibration-damping column 5, the main vibration isolation channel, its high-frequency components are significantly filtered out by the high internal resistance characteristics of the rubber material, and the change in the system's natural frequency fundamentally avoids resonance with the cabinet, cutting off the amplification path of structural sound transmission. Meanwhile, the airborne noise (audible noise) generated by the contactor's operation is confined within the cavity of the soundproof chamber 1 and repeatedly absorbed by the sound-absorbing cotton 7 that fully covers the inner walls of the bottom box 2 and the cover plate 3, causing the sound energy to continuously attenuate through multiple reflections. Any noise attempting to leak through the wire fixing port 15 and the cover plate seam is effectively blocked by the elastic seal of the wire port sound insulation cotton 17 and the high-resistance path of the stepped sealing structure 14, respectively.

[0028] Laboratory simulations and on-site tests have verified that, under the same operating conditions, after installing this device, the noise level measured one meter away from the elevator control cabinet can be stably reduced from the original 60-80 decibels to below 50 decibels, a noise reduction of 10-30 decibels, resulting in a significant improvement in subjective perception. Simultaneously, due to the effective isolation of vibration, the connection reliability of other components within the control cabinet is fundamentally improved, significantly reducing the failure rate of loose plugs and fatigue fractures of solder joints, thus extending the service life of the entire electrical control system. This device has a compact structure, high modularity, and flexible installation methods. It can be used in the manufacture of new elevators to achieve "silent factory delivery," and it is also extremely convenient for quick noise reduction upgrades to existing operating elevators without large-scale modifications to the original control cabinet structure, demonstrating extremely high engineering application value and broad market prospects.

Claims

1. A vibration noise reduction device for elevator contactors, characterized in that, include: The silent cabin (1) consists of a base box (2) and a cover plate (3), and mounting seats (4) are provided on the left and right sides of its top and fixedly connected to the side plate of the elevator control cabinet; The mounting base (4) is an L-shaped plate, which is connected and fixed to the side plate of the elevator control cabinet by inserting a vibration damping column (5); A contactor (6) is installed inside the soundproof compartment (1), and the contactor (6) is fixed inside the bottom box (2) by a flexible connection structure; The inner walls of the bottom box (2) and the cover plate (3) are covered with sound-absorbing cotton (7), and the mounting surface of the cover plate (3) and the bottom box (2) is provided with a stepped sealing structure.

2. The elevator contactor vibration noise reduction device according to claim 1, characterized in that: The vibration damping column (5) is eccentrically set on the shell of the silent cabin (1), and the rear of the silent cabin (1) is covered with vibration-absorbing and sound-insulating cotton (8).

3. The elevator contactor vibration noise reduction device according to claim 2, characterized in that: One end of the vibration damping column (5) is pressed into or glued to the mounting hole of the L-shaped plate (4), and the other end is interference-fitted with the mounting hole on the side plate of the elevator control cabinet.

4. The elevator contactor vibration noise reduction device according to claim 1 or 3, characterized in that: The flexible connection structure includes base one (9), base two (10) and limiting cotton (11). Base one (9) and base two (10) are connected by bolts (12). Base one (9) is installed on the sound-absorbing cotton (7) at the bottom of the bottom box (2).

5. The elevator contactor vibration noise reduction device according to claim 4, characterized in that: The base (9) has four planes that sit evenly on the sound-absorbing cotton (7) of the bottom box.

6. The elevator contactor vibration noise reduction device according to claim 1 or 5, characterized in that: The limiting cotton (11) has a notch and a protrusion, and is fixed to the bottom box (2) by the limiting bracket (13).

7. The elevator contactor vibration noise reduction device according to claim 1 or 5, characterized in that: The limiting bracket (13) has holes that match the protrusions of the limiting cotton (11), and is connected to the corresponding fixing holes of the bottom box (2) by bolts.

8. The elevator contactor vibration noise reduction device according to claim 1 or 5, characterized in that: The bottom box (2) forms a fixing seat (14) and a wire fixing port (15) through an integrated bending forming process. Several open wire tying holes (16) are provided on the bent edge of the wire fixing port (15), and sound insulation cotton (17) is attached to the surface of the bent edge.

9. The elevator contactor vibration noise reduction device according to claim 8, characterized in that: The bent edges on both sides of the cover plate (3) are higher than the assembly surface with the bottom box (2), forming a stepped sealing structure.

10. The elevator contactor vibration noise reduction device according to claim 1 or 9, characterized in that: The inner wall of the cover plate (3) is covered with sound-absorbing cotton (7), and the shape of the sound-absorbing cotton (7) is adapted to the outline of the inner wall of the cover plate (3).

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