Oil supply device for compressor, compressor, and refrigeration equipment

An oil supply device for a compressor, comprising:

• a piston cylinder with an inner chamber, a piston slidingly disposed in the inner chamber, an outer housing cooperating with the piston cylinder, the outer housing has a housing groove, one end of the piston cylinder extends into the housing groove, and an oil intake passage and an oil discharge passage provided on the outer housing;
• the oil intake passage comprises an oil intake chamber extending horizontally, a bottom wall of the oil intake chamber arranged adjacent to the piston cylinder and a side wall of the oil intake chamber connected to the periphery of the bottom wall and extending horizontally away from the piston cylinder, an oil inlet set on the side wall of the oil intake chamber, and an oil outlet set on the bottom wall of the oil intake chamber that communicates with the inner chamber;
• the extending direction of the oil intake chamber is a horizontal direction and parallel to a sliding direction of the piston;
• the side wall of the oil intake chamber has an arcuate flow guide portion to direct flow between the oil inlet and the oil outlet.