Muffler Tube Manufacturer -

Modern hermetic refrigeration compressors demand compact, efficient, and low-noise solutions. One proven and widely adopted approach is the use of a PA66 (Nylon 66) coiled tube as a suction muffler. This design is extensively used in Nidec, Embraco, and other hermetic compressors to reduce gas pulsation noise, vibration, and acoustic resonance. A coiled PA66 muffler tube provides effective noise attenuation while optimizing internal space inside the compressor shell.

What Is a PA66 Coiled Tube Muffler?

A PA66 coiled tube muffler is a specially designed polyamide suction tube installed inside a hermetic compressor. It acts as an acoustic resonator that dampens pressure pulsations generated during the compression cycle.

Unlike straight tubes, the coiled configuration allows longer acoustic length within limited space, making it ideal for compact compressor designs.

Why PA66 (Nylon 66) Is Used in Hermetic Compressors?

PA66 is a preferred engineering polymer for refrigeration applications due to its balanced mechanical and acoustic properties.

Advantages of PA66 Coiled Tube Muffler:

 Excellent noise and vibration damping
 High mechanical strength at elevated temperatures
 Good fatigue and creep resistance
 Compatible with refrigerants and compressor oils
 Low gas permeability, Lightweight and corrosion-free

Unfilled, heat-stabilized PA66 grades are typically used for internal compressor components.

How a Coiled Tube Works as a Muffler

The PA66 tube functions as a quarter-wave acoustic resonator on the suction side of the compressor.

Working Principle:

 Compressor generates periodic pressure pulsations
 The coiled tube absorbs and attenuates dominant frequencies
 Pulsation energy is dissipated as minor thermal losses
 Result: smoother gas flow and reduced audible noise
Important: Acoustic performance depends on effective tube length, not whether the tube is straight or coiled.

Advantages of Using a Coiled Tube Muffler

Feature	Benefit
Coiled geometry	Fits long acoustic length in compact space
Polymer damping	Superior noise reduction vs metal
Lightweight	Reduces internal stress
No corrosion	Long service life
Easy manufrng	Extrusion or injection molding

This makes coiled PA66 mufflers ideal for low-noise domestic and commercial refrigeration compressors.

Parameter	Straight Tube	Coiled Tube
Acoustic performance	High	High
Space utilization	Poor	Excellent
Industry usage	Limited	Most common
Design flexibility	Low	High

PA66 coiled tube mufflers - Industrial Applications:

  Refrigerator compressors
  Freezer compressors
  Small commercial refrigeration units
  Low-noise inverter compressors

Leading compressor manufacturers integrate coiled polymer mufflers to meet stringent NVH (Noise, Vibration, Harshness) requirements. A PA66 coiled tube muffler is a technically proven, space-efficient, and cost-effective solution for noise reduction in hermetic compressors. When properly designed, it delivers excellent acoustic damping without compromising compressor efficiency or reliability. This solution is well-suited for Nidec / Embraco / Hermic compressors, especially in applications where low noise and compact design are critical.

NEXT