Screw type refrigeration compressor and machine body assembly thereof

The utility model discloses a machine body assembly which comprises a machine body, wherein a slide valve cavity matched with a slide valve is formed in the middle of the machine body, and the cross section of the slide valve cavity is an oval with a long axis extending in the vertical direction. According to the slide valve cavity structure with the oval cross section and the long axis extending in the vertical direction, the contact area between the slide valve cavity and the slide valve can be increased effectively, so that the pressure between the slide valve and the slide valve cavity in an equipment operation process is reduced, scratching of the slide valve due to over-large pressure is further avoided, and the service life of related mating parts and the integral equipment operation stability are guaranteed effectively. The utility model discloses a screw type refrigeration compressor applying the machine body assembly.