Compressor head fixing device, compressor and refrigeration device

A compressor head fixing device, comprising:

• a cylinder block and a cylinder head cover, the cylinder head cover being connected to the cylinder block by a fastener, the cylinder block being provided with a compression chamber and an assembly hole configured to fix the fastener;
• a noise reduction chamber, provided on the cylinder block;
• and
• a communication passage, provided in the cylinder block and the cylinder head cover, and being in communication with the assembly hole, the noise reduction chamber and the compression chamber;
• wherein the communication passage comprises:
• a first communication section, provided in the cylinder head cover and being in communication with a chamber opening of the compression chamber and an inlet of the assembly hole;
• a second communication section, provided in the cylinder block and being in communication with the assembly hole and the noise reduction chamber;
• and
• a third communication section, provided in the assembly hole and being in communication with the first communication section and the second communication section;
• the compressor head fixing device further comprises a valve disc and a valve plate, the valve disc is provided between the cylinder block and the cylinder head cover, the valve plate is provided between the valve disc and the cylinder head cover, the valve plate is provided with an air inlet, the valve disc comprises a substrate and a first elastic piece, the substrate is provided with a first through hole matching an outer contour of the first elastic piece, the first elastic piece is located in the first through hole, a root of the first elastic piece is connected to a hole wall of the through hole or the root and the hole wall are formed in one piece, the first elastic piece is further provided with a free end which is in the first through hole and is capable of moving away from the valve plate with respect to the substrate, an orthographic projection of the free end of the first elastic piece on the valve plate at least partially overlaps the air inlet;
• the valve disc further comprises:
• a second through hole and a second elastic piece, the valve plate further comprises:
• a third through hole and an avoidance portion penetrating in a direction perpendicular to the valve plate, the fastener passes through the second through hole and the third through hole to connect to the cylinder block, a hole wall of the second through hole comprises a free end of the second elastic piece, the avoidance portion is in communication with the third through hole in a radial direction, the second elastic piece is capable of moving away from the avoidance portion to make the first communication section be in communication with the third communication section via the avoidance portion.