Roots type hydrogen circulating pump with low-disturbance outlet runner

The Roots type hydrogen circulating pump comprises a cavity cover, one side of the cavity cover is connected with a cavity, and the other side of the cavity cover is provided with a gas inlet connector and a gas outlet connector. A transmission shaft and a driving shaft are arranged in the cavity; a transmission rotor and a driving rotor are respectively arranged at the end parts of the transmission shaft and the driving shaft; a rotor cavity is formed in the cavity, and the transmission rotor and the driving rotor synchronously and reversely rotate around the centers of the transmission shaft and the driving shaft in the rotor cavity respectively; the left side of the rotor cavity is an air outlet high-pressure area; the cavity cover is provided with an air outlet channel, an air outlet and an air inlet, the air inlet is communicated with the air inlet low-pressure area, and the air outlet channel and the air outlet are communicated with the air outlet high-pressure area. According to the actual working cond