Compressor and additional oil injection system having same

An additional oil injection system, wherein the additional oil injection system comprises:

• a compressor, wherein the compressor is a single-stage oil injected screw compressor, wherein the compressor has a compression chamber and an exhaust port, wherein the compressor comprises a compressor element and an exhaust end face provided on the compressor element, wherein, the compression chamber is formed in the compressor element, while the exhaust port is opened on the exhaust end face, the compression chamber is communicated with the exhaust port, the compression chamber has an oil inlet of the compression chamber, and an oil injection port of the exhaust port is provided at the exhaust port,
• an oil reservoir;
• a main oil circuit, wherein, one end of the main oil circuit is communicated with the oil reservoir, the other end of the main oil circuit is communicated with a first branched oil circuit and a second branched oil circuit, the first branched oil circuit is communicated with the oil inlet of the compression chamber, and the second branched oil circuit is communicated with the oil injection port of the exhaust port;
• and
• an oil pump at least used to provide the power for oil to flow from the oil reservoir to the second branched oil circuit, wherein the oil pump is provided on the second branched oil circuit to drive the oil in the second branched oil circuit to flow;
• wherein the additional oil injection system further comprises an oil relief circuit, wherein, one end of the oil relief circuit is directly connected with the main oil circuit, the other end of the oil relief circuit is directly connected with the oil reservoir, and the oil relief circuit is provided with an overflow valve, the overflow valve being configured as such that if the oil pressure of the oil relief circuit exceeds a preset pressure value, the overflow valve is opened, while when the oil pressure of the oil relief circuit does not exceed the preset pressure value, the overflow valve is closed.