The Guangchang Liyuan heat exchange station in Longxi, Gansu Province, had long plagued residents on the first floor due to the noise from a water pump.
The buzzing sound downstairs made it difficult for residents upstairs to sleep. Residents stated, “At night, that low-frequency buzzing sound is like it’s drilling into my ears; I can’t sleep.” The “traces of history” were visible on-site—soundproofing was done on the walls, soundproof covers were added to the equipment, and then another layer was added on top. Almost every conceivable method had been tried.
“Not noticeable,” commented the heat exchange station manager regarding previous renovations.
Years of complaints, a persistent problem
It is understood that the heat exchange station is responsible for providing winter heating for approximately 12,000 square meters and over 100 households in the surrounding area. Previously, it used an old, fixed-frequency water pump, whose noise level reached over 95 decibels at night. Residents had repeatedly complained to the property management and community, and the heat exchange station had sought solutions multiple times.
Mr. Feng, the person in charge of the heat exchange station, explained, “We tried various methods before, including adding sound insulation cotton, building vibration-damping foundations, and even constructing a soundproof wall outside the equipment room, spending tens of thousands of yuan in total. However, the noise was only reduced slightly; the fundamental problem remained unsolved.”
The insignificant effect was due to the unaddressed root cause of the vibration. Without reducing the noise of the water pump itself, even multiple layers of external insulation are merely scratching the surface.
Replacing the “heart,” quietness returned.
This time, they addressed the most critical issue—replacing it with a Kaiquan KQLE intelligent variable frequency pump.
After an on-site inspection by Kaiquan’s local technical team, it was discovered that the original water pump was not only noisy but also inefficient and energy-intensive. The KQLE Smart Variable Frequency Pump—a product of the Kaiquan National Technology Center—integrates the pump, motor, and frequency converter into one unit, fundamentally solving users’ pain points:
✅ Significantly Improved Quiet Operation: Adopting a coaxial design for the pump and motor, the impeller’s automatic dynamic balancing accuracy reaches G2.5 level. Combined with the low-noise characteristics of the permanent magnet motor, the unit’s operating noise is 5-8 decibels lower than conventional products.
✅ Outstanding Energy Saving: Equipped with a first-class energy-efficient permanent magnet motor, efficiency under rated operating conditions is 8%-10% higher than conventional products.
✅ Optimized Overall Cost: The KQLE integrated frequency converter design eliminates the need for traditional frequency converter cabinets, reducing user procurement costs by 20%-25%. For renovation projects with limited budgets, this design directly reduces initial investment.
✅ Guaranteed Operational Reliability: Utilizing imported bearings and mechanical seals, and with one-time machining center positioning to ensure concentricity, ensuring long-term continuous and trouble-free operation.
Continuous Protection, A Reassuring Choice
November 1, 2025: New pump installation and commissioning completed. That evening, the technical team brought a decibel meter to the equipment’s operating site for testing—the indoor noise level dropped from 95 decibels to 60 decibels, a significant reduction in operating noise.
It was practically inaudible outside the door. Vibration tests showed excellent stability. Since then, no one has bothered with it; it has been running quietly ever since.
To date, this KQLE smart variable frequency pump has been running continuously without failure for over 120 days. The heat exchange station manager calculated that, based on current electricity prices, the annual electricity savings can offset part of the equipment investment, making this upgrade very worthwhile.
Product delivery is not the end, but the beginning of service. Kaiquan’s smart silent solution makes equipment operation quieter, more energy-efficient, and more reliable. All products enjoy timely after-sales response service, free inspection and commissioning during the warranty period, ensuring users’ peace of mind.
