Insulator is a component used to isolate different potentials in electrostatic precipitator. Its main materials are high-performance ceramics (such as alumina ceramics) or special industrial ceramics, which have extremely high resistivity and can withstand strong electric field strength without being broken down.
Product Description
Our ESP Insulators are essential components in the electrostatic precipitator system, providing both electrical isolation and mechanical support. At Dawei, we manufacture and supply high-performance shaft insulators, support insulators, and through-wall insulators that are engineered to withstand the rigors of high voltage, high temperature, and harsh industrial environments, ensuring stable operation and long service life.
Shaft Insulator for ESP: Designed to electrically isolate the rotating rapping shaft from the grounded ESP structure while allowing smooth mechanical motion.
Support Insulator for ESP: Provides strong mechanical support for high-voltage electrode frames (such as collecting or discharge electrodes) while maintaining excellent dielectric strength.
Through-Wall Insulator: Bridges conductors through the ESP casing, preserving high-voltage integrity with reliable insulation.
These insulators are suited for a broad range of ESP configurations — from power plants and cement kilns to waste-to-energy facilities and metallurgical plants.
safely and reliably isolate components with tens of thousands of volts of high voltage (such as cathode frame and discharge electrode) from grounded components (such as dust collector shell and dust collector). Ensure that high voltage electricity is only applied to the discharge electrode (cathode), thus forming a strong electrostatic field between the cathode and anode, which is the basis for dust charging and trapping.
Bear all the weight of the cathode system (including cathode frame, discharge electrode, etc.) and hang it accurately in the center of the dust collector channel.
Ensuring the constant distance between discharge electrode and dust collector is the key to maintain stable electric field and high dust removal efficiency.
1. High Electrical Insulation & Mechanical Strength
Our shaft insulator for ESP and support insulator for ESP are made from high-alumina ceramic or porcelain materials, providing outstanding dielectric strength and compressive load capacity. This ensures reliable electrical isolation under high DC voltage, while also carrying mechanical loads from shafts or electrode frames.
2. Robust Design for Industrial Conditions
Dawei’s insulators are engineered to handle:
• High operating temperatures (e.g., during hopper heating or hot flue gas)
• Mechanical vibrations and shocks, especially in systems with rapping or rotating shafts
• Harsh environments with dust, moisture, or corrosive gases
3. Optimized for ESP Rapping Systems
For rapping-driven ESP designs, the shaft insulator ensures that your rapping system can rotate or move without electrical leakage. This is critical for rapping assemblies such as tumbling hammers or pin-wheel mechanisms.
In addition, we support insulator heater integration (e.g., insulator heater pads) to maintain surface temperature and prevent condensation, which can otherwise reduce insulation performance.
4. Precise Geometry & Creepage Optimization
Our support insulators (cylindrical or conical) are optimized for maximum creepage distance to prevent surface tracking and minimize leakage current.
Through-wall insulators are designed to allow safe conductor feed-through while maintaining the integrity of the ESP casing and high-voltage barrier.
5. Long Service Life & Reliability
Thanks to superior material selection and quality control, our ESP insulators resist mechanical fatigue, thermal stress, and electrical breakdown — helping to reduce maintenance costs, minimize unplanned downtime, and extend the lifespan of your ESP system.
6. Engineering Support & Customization
Dawei’s team of engineers can help you select the right type and size of insulator based on your ESP’s design drawings, voltage level, rapping mechanism, and structural configuration.
For retrofit or upgrade projects, we can provide custom insulators (shaft, support, or through-wall) tailored to your exact specifications and operational parameters.
Our insulators are widely used in ESP systems across multiple industries:
•Coal-fired and biomass power plants (electrical isolation for rapping shafts and electrode support)
•Cement plants (supporting large electrode frames under thermal cycles)
•Steel & metallurgical plants (robust insulators to sustain vibration and dust)
•Chemical / petrochemical plants (with corrosive flue gas)
•Waste-to-energy / incineration plants (through-wall insulators to maintain high voltage integrity across casing)
Upgrade your system with high-quality ESP insulators, including shaft insulators, support insulators, and through-wall insulators engineered for long-term stability and high-voltage reliability.
Whether you are replacing worn components or planning a full ESP retrofit, Dawei provides precise matching, fast delivery, and customized solutions based on your drawings and operating conditions.
Contact us today to request a quotation or technical consultation — our engineering team will help you select the most suitable ESP shaft insulator or support insulator for ESP to ensure optimal performance and maximum operational safety.
