Project Overview
A rooftop mechanical system consisting of more than 20 air-cooled heat pump units was installed for a building. Each unit weighs approximately 1.2 tons and operates continuously under varying load conditions.
Due to the structural constraints of the existing rooftop and the fixed layout of piping systems, the installation height of the equipment base could not be increased. The project therefore required a vibration isolation solution that could deliver high isolation efficiency within very limited vertical space.
Engineering Challenge
Limited installation height due to existing pipeline and structural constraints
Heavy rooftop equipment (1.2 tons per unit)
Low-frequency vibration transmission generated during compressor operation
Requirement for stable long-term operation and equipment protection
The customer required an effective vibration control solution capable of reducing vibration transmission to the building structure while maintaining system stability and safety.
Customized Solution
To meet the project requirements, Anlijing engineers designed a customized vibration isolation solution based on the ALJ-0401500 large-deflection spring vibration isolator.
Solution Highlights
Selection of large-deflection spring isolators to achieve superior low-frequency vibration isolation
Implementation of a side-support mounting configuration, allowing installation without increasing the overall equipment height
Integration of adjustable leveling capability to ensure stable equipment operation
This solution successfully addressed both space limitations and vibration control requirements.
Core Technical Advantages
Excellent Low-Frequency Isolation
The isolator features a 50 mm large deflection spring design, achieving a natural frequency as low as 2.3 Hz, which significantly reduces low-frequency vibration transmission from rooftop mechanical equipment.
Safety Protection Design
The isolator is equipped with dual-side limit screws, preventing excessive displacement during strong winds, equipment startup, or sudden load changes, ensuring operational safety.
Precise Level Adjustment
The adjustable height design allows rapid leveling during installation and maintenance, ensuring long-term stable operation of the heat pump units and extending equipment service life.
Product Specifications
ALJ-0401500 Spring Vibration Isolator
Length（L） | Height（H） | Top Mounting Hole（M） | Base Hole Distance（L1） | Vertical Stiffness |
250mm | 250mm | 14mm | 220mm | 10Kg/mm |
Project Results
After installation of the ALJ spring vibration isolation system, the project achieved:
Significant reduction of vibration transmission to the building structure
Stable and reliable operation of rooftop heat pump units
Improved equipment safety and longevity
Effective vibration control without increasing installation height
The solution fully satisfied the client's requirements for efficient vibration isolation under restricted space conditions.
About Anlijing
Anlijing Vibration Reduction Technology Co., Ltd.
Anlijing specializes in vibration and noise control solutions for electromechanical equipment. With extensive engineering experience and data-driven product selection, we provide complete services including vibration testing, engineering design, product selection, and customized manufacturing.
Our vibration isolation products are widely used in HVAC systems, precision instruments, industrial machinery, building equipment, and transportation systems, helping customers achieve safer, quieter, and more stable equipment operation.
