In experimental scenarios such as petroleum analysis, biomedicine, and food inspection, glass capillary viscometers, sampling needles, or medical catheters with a diameter of less than 1mm are often blocked by stubborn pollutants such as heavy oil and protein. Traditional hand cranked brushes and soaking in organic solvents are not only inefficient, but also prone to damaging the pipe wall. The capillary cleaning machine is designed as a "miniature pipeline cleaner" to solve this pain point. How does it "please" out the dirt that is difficult to distinguish with the naked eye? The answer is hidden in three complementary physical and chemical combination punches - "steaming, flushing, and cavitation".

The first move is "steaming". The device is equipped with a sealed small distillation chamber, which heats low boiling petroleum ether or ethanol above its boiling point. The solvent vapor enters the capillary tube inserted into the quick connector through a dedicated pipeline. Steam condenses into pure liquid on the pipe wall, dissolves high molecular weight pollutants such as asphalt and oil, and flows back by gravity, completing a cycle of "distillation condensation dissolution". Due to the constant dynamic equilibrium of the solvent in the gas-liquid state, there are almost no residual dead corners inside the tube, and the temperature is controllable, which avoids glass thermal stress explosion.

The second move is' charge '. Relying solely on the free reflux of the solvent, there is still a lack of resistance to granular adhesion layers or salt crystals. Therefore, the machine is connected in parallel with a positive/negative pressure pulse channel outside the steam circuit. PLC first starts the vacuum pump, establishes a -60kPa transient negative pressure at both ends of the capillary tube, and "sucks" the alkaline solution or surfactant preheated to 50 ℃ into the tube cavity; Then switch to the micro diaphragm pump, apply a positive pressure of 0.3MPa, and push the liquid out at high speed. The shear force generated by bidirectional opposition can strip solid particles as small as 1 μ m. The entire process is set by the touch screen with pulse frequency, holding time, and pressure gradient, achieving an automatic cycle of "soaking loosening peeling discharging". It takes less than 1 minute to complete the deep cleaning of a viscometer.

The third trick is "cavitation". When the pollutants are organic membranes such as proteins and polymers, even high-pressure flushing is difficult. At this point, the machine switches to ultrasonic mode: 40kHz high-frequency electrical energy is converted into mechanical vibration through a piezoelectric ceramic transducer, forming a periodic negative pressure zone in the cleaning solution, nurturing countless vacuum bubbles of about 50 μ m. The bubble instantly collapses in the positive pressure zone, producing a shock wave of about 1000 atm and a micro hot spot at 4500 ℃ locally, tearing the organic film into fragments and emulsifying it like a micro "explosion". More cleverly, the equipment connects the ultrasonic tank with the distillation hedge module in series. First, the ultrasonic membrane is broken, then steam rinsing, and finally high-pressure flushing is completed in one go. This ensures the smoothness of the glass surface Ra ≤ 0.2 μ m and avoids micro cracks in the pipe mouth caused by prolonged ultrasonic treatment.

The three sets of technologies are not simply stacked, but are uniformly scheduled by a 32-bit ARM chip: temperature, pressure, ultrasonic power, and pulse frequency are transmitted in real-time. The system automatically matches the three process packages of "economy standard strengthening" according to the dirt level, and records the time and solvent consumption of each step to achieve traceability management. The waste liquid can be recycled through graded condensation, activated carbon adsorption, and PP cotton filtration, with VOC emissions lower than 1/10 of the national standard, truly achieving high efficiency, green, and intelligence.