In the refrigeration compressor, the assembly of the shaft and the rotor is usually realized by the interference heat installation. Shrink fit mainly uses the expansion and contraction properties of materials. Put the heated expansion rotor on the shaft. When the rotor is restored, the hoop force on the shaft will be generated to ensure that the shaft and the rotor are closely connected. The hot mounting method needs to heat the rotor. During the assembly process, the deformation of the rotor is large, which is easy to cause quality problems. Especially for some small machines, the hot mounting method often causes prominent quality problems due to its excessive deformation.
In view of this, in order to solve the above technical problems, the invention provides an assembly structure of shaft and rotor suitable for cold assembly, an improved method of physical structure such as edge cutting and taper is added on the shaft, the hoop force between the shaft and rotor is increased after the assembly, and the reliable assembly of the shaft and rotor is realized.
The utility model relates to an assembly structure of a shaft and a rotor which is suitable for cold assembly, including a shaft and a rotor which are provided with a long shaft part, the long shaft part is provided with a rotor installation position, the rotor is sleeved on the rotor installation position of the shaft, the feature is: the outer edge of the long shaft part is provided with a cutting edge, the outer edge of the long shaft part is partially provided with a protrusion with a certain taper, the long shaft part is hollowed out and screwed into a screw.
The cutting edge refers to the trimming of the neat edge of the long axis along the axis direction; the protrusion refers to the protrusion with a certain taper along the axis direction of the long axis. Since the outer edge of the long shaft is provided with trimming and protrusion, the shaft section changes from regular circle to irregular approximate circle, which fits with regular circle on the inner side of the rotor, and the inner diameter of the rotor is slightly smaller than the outer diameter of the shaft, so the shaft and the rotor are in interference fit, and the rotor is pushed into the rotor installation position by the way of external pressure. Due to the interference between the shaft and the rotor, the rotor is clamped against the shaft Force to realize the reliable assembly of shaft and rotor. The axial part of the long shaft is hollowed out and screwed in with screws. Due to the extrusion of screw threads, the axial outside expands; after the rotor is installed into the shaft, the shaft expands radially by adding screws; on the premise of not increasing the difficulty of pressing the rotor, the interference between the shaft and the rotor is increased.