Runjin Gets Compressor Bolt Patent

Amid the rapid development of refrigeration, new energy vehicles, and related sectors, the compressor serves as a core power component. The reliability of its mounting directly determines operational safety and service life. As the critical link connecting compressors to equipment platforms, high-strength mounting bolts face the industry-wide challenge of loosening and detachment under long-term vibration. According to the latest disclosure from the National Intellectual Property Administration, Zhejiang Runjin Automotive Technology Co., Ltd. has successfully developed a mounting bolt for compressors and obtained a utility model patent, authorization announcement number CN223549604U, with an application date of January 2025, providing an innovative solution to this persistent problem.

According to the patent abstract, the mounting bolt adopts an elastic snap-fit anti-detachment concept as its core design principle, representing a breakthrough improvement over conventional bolt structures. The key structure includes a cylindrical screw shaft, a nut, and an integrated anti-detachment assembly. This assembly consists of locking blocks, springs, pull rods, and cross rods. Multiple springs are evenly arranged on the outer side of each locking block, with spring ends fixed to both a disc and the locking block, forming a stable elastic return mechanism. This fundamentally addresses the limitation of traditional bolts that rely solely on thread locking.

The installation and anti-detachment mechanism of this patent offers strong practical value, combining ease of installation with reliable fixation. During operation, the technician first squeezes the pull rods on both sides of the bolt, then engages a wrench around the nut while ensuring the two pull rods fit precisely into preset grooves on the nut. Rotating the wrench drives the external threads of the cylinder into the threaded holes of the compressor and equipment platform. When the bolt is tightened to the point where the cross rods align with the grooves in the inner wall of the compressor's threaded hole, the wrench is stopped and removed. At this point, the compressed springs release their force, returning the locking blocks to position, and the ends of the cross rods are driven into the grooves of the compressor's threaded hole, achieving dual fixation through both thread locking and mechanical engagement.

The core advantage of this innovative design lies in its dynamic anti-detachment capability. Traditional compressor mounting bolts, during long-term operation, are prone to thread wear and preload decay due to equipment vibration, eventually leading to bolt loosening and compressor detachment accidents. With this patented product, the continuous elastic force provided by the springs keeps the cross rods consistently engaged in the grooves. Even if minor thread wear occurs, the secure connection between the bolt and equipment remains intact, fundamentally resolving a long-standing safety concern in the industry.

A representative from Zhejiang Runjin Automotive Technology Co., Ltd. stated that this patented technology has undergone multiple rounds of工况 simulation testing and is suitable for various compressor applications including household air conditioners, automotive air conditioners, and industrial refrigeration units. Installation efficiency is 30% higher than that of traditional bolts, and anti-detachment reliability under continuous vibration is 2.5 times higher than industry standards. The technology has now entered the commercialization phase, with several refrigeration equipment manufacturers expressing preliminary cooperation interest.

Industry experts note that although this technological breakthrough in compressor mounting bolts represents a small-component innovation, it can drive safety upgrades across the entire refrigeration equipment supply chain. Zhejiang Runjin's patent not only demonstrates the company's focused R&D capability but also fills a domestic technology gap in specialized anti-detachment bolts for compressors. In the future, this is expected to accelerate the import substitution of core refrigeration equipment components in China, injecting new vitality into the high-quality development of equipment manufacturing.