On January 21, 2025, the State Intellectual Property Office of the People's Republic of China (SIPO) showed that Liaoning Hengxing Pump Industry Co., Ltd. applied for a patent titled “A kind of cam Rotary Lobe Pump with noise reduction structure”, Public No. CN 119267216 A, with the date of application of October 2024, the abstract of the patent shows that the present invention discloses a kind of cam Rotary Lobe Pump with noise reduction structure.

According to the abstract of the patent, the present invention discloses a cam Rotary Lobe Pump with noise-reducing structure, in which a first noise-reducing chamber is opened in the housing of the pump body of the cam Rotary Lobe Pump, and a second noise-reducing chamber is opened in the front cover and housing of the cam Rotary Lobe Pump, and noise-reducing materials are stored in the first noise-reducing chamber and the second noise-reducing chamber; and a number of sand-removing ports are provided outside the said first noise-reducing chamber and the second noise-reducing chamber. Said noise-reducing materials are polypropylene foam and polyurethane foam. By setting up the noise reduction structure, under the same use pressure, the pump noise can be reduced by 5 - 7 decibels effectively improving the working environment of the site This material has natural sound absorption, thermal insulation, cushioning and environmental protection, and its internal subtle independent bubble structure effectively reduces the noise of the pump. Noise-reducing structure effectively improves the working environment of the user workers on site, and meets the requirements of the national environmental protection standards, and is the most ideal replacement product in the cam Rotary Lobe Pump.

Eyes on the sky information shows that Liaoning Hengxing Pump Industry Co., Ltd, founded in 1998, is located in Dandong City, is a general equipment manufacturing industry is mainly engaged in the enterprise. The registered capital of the enterprise is 102.77 million RMB, and the paid-up capital is 69.27 million RMB. Through the big data analysis of Tianyecha, Liaoning Hengxing Pump Industry Co., Ltd. has participated in bidding projects for 150 times, and there are 3 trademarks and 60 patents in terms of intellectual property rights, in addition, the enterprise also has 33 administrative licenses.