Views: 1996 Author: Site Editor Publish Time: 2024-10-12 Origin: Site
Everyone is familiar with H-type rotary joints. The golden copper shell looks very beautiful. Not many people are familiar with the HK type rotary joint. After all, this is a rotary joint only used for large equipment. In fact, the difference between H-type rotary joints and HK is not only in the shell. More importantly, it is in terms of functionality and scope of use.
One is that the H-type rotary joint is made of cast copper, and the shell is relatively brittle. Although it has good corrosion resistance, it is easy to crack under high pressure or external force; The shell of HK type rotary joint is usually welded and processed with steel pipe or sheet metal. It has strong compressive strength and can withstand pressure that H-type rotary joints cannot withstand. So, if the work pressure is particularly high, it is safer to use HK.
The second is the sealing structure. The sealing structure of the H-shaped rotary joint is determined during casting and cannot be changed by us. It can only be a uniform form; We can make some changes in the material selection and manufacturing process of the HK type rotary joint. For example, changing the size of seals and increasing the clearance between bearings. It cannot be compared to an H-shaped shell.
The third is the selection of sealing components. The combination of sealing components for H-type rotary joints
cannot be changed due to the influence of shell size. The HK type rotary joint can be modified according to the required combination of sealing components and sealing structure. For example, replace the sealing ring with one with a skirt edge. Increase the sealing element, thicken the sealing surface, change the placement of the spring, etc.
The fourth is to withstand temperature effects. The operating temperature of H-type rotary joints is generally below 300 degrees Celsius. Worried about the shell cracking during sudden temperature fluctuations; The HK type rotary joint, made of steel, has good compressive strength and higher temperature resistance than cast copper. Especially for large-sized rotating joints installed on large equipment.
Fifth, consider the cost aspect. HK rotary joints are mainly used for making large rotary joints. Almost no one does small ones. Because the larger the copper shell, the higher the cost and the higher the construction cost. Whether it's the molds for castings or the processing procedures, or the raw materials for shells, many customers cannot accept them. That's why the HK type rotary joint appeared. And small-sized rotary joints themselves are inexpensive. Castings are easy to process and have low costs. On the contrary, the cost of splicing with steel is higher. So we cannot see HK type rotary joints with a size of two inches in the market.