A refrigerant lubricated bearing assembly, comprising a transmission shaft, a bearing and the liquid injection ring; the liquid injection ring comprises a ring body, wherein the ring body is provided with a liquid storage chamber and a plurality of liquid guide holes; the liquid storage chamber is arranged in a circle around the axis of the ring body; the inlets of the liquid guide holes communicate with the liquid storage chamber, and the outlets of the liquid guide holes face the end surface of a to-be-lubricated bearing; and the plurality of liquid guide holes are uniformly distributed in a spaced manner along the circumferential direction of the ring body, the bearing and the ring body both are sleeved on the transmission shaft; characterized in that the liquid guide holes comprise transition holes and liquid injection holes that communicate with each other; the transition holes are in communication with the liquid storage chamber; a plurality of transition holes are uniformly distributed in a spaced manner along the circumferential direction of the ring body; the outlets of the liquid injection holes face the end surfaces of the to-be-lubricated bearing; a plurality of liquid injection holes are uniformly distributed in a spaced manner along the circumferential direction of the ring body; and the diameter of the plurality of liquid injection holes is smaller than that of the transition holes; wherein each liquid injection hole penetrates through the ring body and forms two outlets respectively in two end faces of the ring body, and the outlets of the liquid injection holes located in the same end face of the ring body are uniformly distributed in a spaced manner along the circumferential direction of the ring body; and wherein the volume of the liquid storage chamber is greater than or equal to the sum of the volumes of all transition holes and all liquid injection holes, and the volume of each transition hole is greater than or equal to that of the corresponding liquid injection hole; wherein there are two bearings that are respectively located at the two sides of the ring body; the ring body is clamped between the two bearings; the outlets of some liquid guide holes face the end face of one bearing; the outlets of the other liquid guide holes face the end surface of the other bearing; and the liquid guide holes corresponding to the same bearing are uniformly distributed in a spaced manner along the circumferential direction of the ring body. the liquid injection ring comprises a ring body, wherein the ring body is provided with a liquid storage chamber and a plurality of liquid guide holes; the liquid storage chamber is arranged in a circle around the axis of the ring body; the inlets of the liquid guide holes communicate with the liquid storage chamber, and the outlets of the liquid guide holes face the end surface of a to-be-lubricated bearing; and the plurality of liquid guide holes are uniformly distributed in a spaced manner along the circumferential direction of the ring body, the bearing and the ring body both are sleeved on the transmission shaft; characterized in that the liquid guide holes comprise transition holes and liquid injection holes that communicate with each other; the transition holes are in communication with the liquid storage chamber; a plurality of transition holes are uniformly distributed in a spaced manner along the circumferential direction of the ring body; the outlets of the liquid injection holes face the end surfaces of the to-be-lubricated bearing; a plurality of liquid injection holes are uniformly distributed in a spaced manner along the circumferential direction of the ring body; and the diameter of the plurality of liquid injection holes is smaller than that of the transition holes; wherein each liquid injection hole penetrates through the ring body and forms two outlets respectively in two end faces of the ring body, and the outlets of the liquid injection holes located in the same end face of the ring body are uniformly distributed in a spaced manner along the circumferential direction of the ring body; and wherein the volume of the liquid storage chamber is greater than or equal to the sum of the volumes of all transition holes and all liquid injection holes, and the volume of each transition hole is greater than or equal to that of the corresponding liquid injection hole; wherein there are two bearings that are respectively located at the two sides of the ring body; the ring body is clamped between the two bearings; the outlets of some liquid guide holes face the end face of one bearing; the outlets of the other liquid guide holes face the end surface of the other bearing; and the liquid guide holes corresponding to the same bearing are uniformly distributed in a spaced manner along the circumferential direction of the ring body.