Water source heat pump system

Abstract

The present application provides a water source heat pump system including a first unit and a second unit. The first unit includes a first compressor, a first condenser and a first evaporator. The second unit includes a second compressor, a second condenser and a second evaporator. The first compressor, the first condenser and the first evaporator are in communication with each other to form a first refrigerant circuit, and the second compressor, the second condenser and the second evaporator are in communication with each other to form a second refrigerant circuit. A fluid pipeline in the first condenser and a fluid pipeline in the second condenser are connected in series to allow a heating fluid to pass through the second condenser and the first condenser in sequence. A fluid pipeline in the first evaporator and a fluid pipeline in the second evaporator are connected in series to allow a heat source fluid to pass through the first evaporator and the second evaporator in sequence. The first compressor and the second compressor are both centrifugal direct-drive compressors, and each of the centrifugal direct-drive compressors includes a first compression chamber, a second compression chamber, a driving motor and at least three impellers.

1 . A water source heat pump system, comprising:
 a first unit; and   a second unit, wherein the first unit includes a first compressor, a first condenser and a first evaporator,   the second unit includes a second compressor, a second condenser and a second evaporator,   the first compressor, the first condenser and the first evaporator are in communication with each other to form a first refrigerant circuit, and the second compressor, the second condenser and the second evaporator are in communication with each other to form a second refrigerant circuit,   a fluid pipeline in the first condenser and a fluid pipeline in the second condenser are connected in series to allow a heating fluid to pass through the second condenser and the first condenser in sequence,   a fluid pipeline in the first evaporator and a fluid pipeline in the second evaporator are connected in series to allow a heat source fluid to pass through the first evaporator and the second evaporator in sequence, and   the first compressor and the second compressor are both centrifugal direct-drive compressors, and each of the centrifugal direct-drive compressors includes   a first compression chamber having an inlet in communication with an evaporator,   a second compression chamber having an outlet in communication with a condenser, and an inlet in communication with an outlet of the first compression chamber,   a driving motor including a motor body and a motor shaft, in which the motor body is disposed between the first compression chamber and the second compression chamber, and the motor shaft penetrates the motor body and both ends thereof extend into the first compression chamber and the second compression chamber, respectively, and   at least three impellers that are all fixed on the motor shaft and are separately arranged in the first compression chamber and the second compression chamber.   
     
     
         2 . The water source heat pump system according to  claim 1 , wherein
 the heat source fluid with a temperature of 0° C. to 10° C. is guided into the fluid pipeline of the first evaporator, and the heat source fluid is river water, lake water or sea water, and the heating fluid with a temperature of 60° C. to 100° C. is guided out from the fluid pipeline of the first condenser.   
     
     
         3 . The water source heat pump system according to  claim 1 , wherein
 the centrifugal direct-drive compressor further includes a frequency converter electrically connected to the driving motor, and   the centrifugal direct-drive compressor uses the frequency converter to adjust a rotation speed of the impellers.   
     
     
         4 . The water source heat pump system according to  claim 1 , wherein
 the centrifugal direct-drive compressor further includes   a first variable guide vane disposed corresponding to the inlet of the first compression chamber, and   a second variable guide vane disposed corresponding to the inlet of the second compression chamber.   
     
     
         5 . The water source heat pump system according to  claim 1 , wherein
 the inlet of the first compression chamber is disposed corresponding to one of the impellers which is farthest from the motor body in the first compression chamber,   the outlet of the first compression chamber is disposed corresponding to one of the impellers which is closest to the motor body in the first compression chamber,   the inlet of the second compression chamber is disposed corresponding to one of the impellers which is farthest from the motor body in the second compression chamber, and   the outlet of the second compression chamber is disposed corresponding to one of the impellers which is farthest from the motor body in the second compression chamber and is arranged separately from the inlet of the second compression chamber.   
     
     
         6 . The water source heat pump system according to  claim 1 , wherein
 the first condenser and the first evaporator each have a length extending in an X-axis direction, and the first condenser and the first evaporator are stacked in a Z-axis direction,   the second condenser and the second evaporator each have a length extending in the X-axis direction, and the second condenser and the second evaporator are stacked in the Z-axis direction, and   the first condenser and the second condenser are arranged side by side in a Y-axis direction, and the first evaporator and the second evaporator are arranged side by side in the Y-axis direction.   
     
     
         7 . The water source heat pump system according to  claim 6 , wherein
 one end of the second condenser in the X-axis direction is provided with a heating fluid inlet, and the other end is provided with a first connection port,   one end of the first condenser close to the heating fluid inlet in the X-axis direction is provided with a heating fluid outlet, and the other end is provided with a second connection port connected to the first connection port,   one end of the first evaporator close to the heating fluid inlet in the X-axis direction is provided with a heat source fluid inlet, and the other end is provided with a third connection port, and   one end of the second evaporator close to the heat source fluid inlet in the X-axis direction is provided with a heat source fluid outlet, and the other end is provided with a fourth connection port connected to the third connection port.   
     
     
         8 . The water source heat pump system according to  claim 7 , wherein
 the first unit further includes a first economizer connected between the first condenser and the first evaporator and provided with two first outlets,   the second unit further includes a second economizer connected between the second condenser and the second evaporator and provided with two second outlets,   the first compressor is provided with two first air supply ports, and the two first outlets are respectively in communication with the two first air supply ports, and   the second compressor is provided with two second air supply ports, and the two second outlets are respectively in communication with the two second air supply ports.   
     
     
         9 . The water source heat pump system according to  claim 8 , wherein
 the first economizer has a length extending in the X-axis direction and is positioned on a side of the first unit away from the second unit, and   the second economizer has a length extending in the X-axis direction and is positioned on a side of the second unit away from the first unit.   
     
     
         10 . The water source heat pump system according to  claim 9 , wherein
 the two first air supply ports are arranged on both sides of a central axis of the first compressor extending in the X-axis direction, respectively, and   the two second air supply ports are arranged on both sides of a central axis of the second compressor extending in the X-axis direction, respectively.