A rotary compressor (102) has a shaft (4), a cylinder (5), a piston (8), a first vane (32), a second vane (33), a first suction port (19), and a second suction port (20). The first vane (32) divides a space between the cylinder (5) and the piston (8) along a circumferential direction of the piston (
A rotary compressor (102) has a shaft (4), a cylinder (5), a piston (8), a first vane (32), a second vane (33), a first suction port (19), and a second suction port (20). The first vane (32) divides a space between the cylinder (5) and the piston (8) along a circumferential direction of the piston (8). The second vane (33) further divides the space divided by the first vane (32) along the circumferential direction of the piston (8) so that a first compression chamber (25) and a second compression chamber (26) having a smaller volume than the first compression chamber (25) are formed within the cylinder (5). The first suction port (19) introduces a working fluid into the first compression chamber (25). The second suction port (20) introduces a working fluid into the second compression chamber (26). The second suction port (20) is provided with a suction check valve (50).
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1. A rotary compressor comprising: a cylinder;a piston disposed within the cylinder so as to form a space between the piston itself and the cylinder;a shaft to which the piston is fitted;a first vane for dividing the space along a circumferential direction of the piston, the first vane being attache
1. A rotary compressor comprising: a cylinder;a piston disposed within the cylinder so as to form a space between the piston itself and the cylinder;a shaft to which the piston is fitted;a first vane for dividing the space along a circumferential direction of the piston, the first vane being attached to the cylinder at a first angular position along a rotation direction of the shaft;a second vane for further dividing the space divided by the first vane along the circumferential direction of the piston so that a first compression chamber and a second compression chamber having a smaller volume than the first compression chamber are formed within the cylinder, the second vane being attached to the cylinder at a second angular position along the rotation direction of the shaft;a first suction port for introducing a working fluid to be compressed in the first compression chamber into the first compression chamber;a first discharge port for discharging the working fluid compressed in the first compression chamber outside the first compression chamber from the first compression chamber;a second suction port for introducing the working fluid to be compressed in the second compression chamber into the second compression chamber;a second discharge port for discharging the working fluid compressed in the second compression chamber outside the second compression chamber from the second compression chamber; anda suction check valve provided in the second suction port, whereinan angle θ between the first angular position and the second angular position is set to 270 degrees or more in the rotation direction of the shaft, so that the first compression chamber occupies an interior space of the cylinder from the first vane to the second vane in the rotation direction of the shaft, andno suction check valve is provided in the first suction port. 2. The rotary compressor according to claim 1, wherein the suction check valve prevents the working fluid drawn into the second compression chamber from flowing back outside the second compression chamber through the second suction port (i) during a period from a point of time when the second compression chamber reaches a maximum volume to a point of time when the second compression chamber reaches a minimum volume, (ii) during a period from the point of time when the second compression chamber reaches the maximum volume to a point of time when the compressed working fluid begins to be discharged outside the second compression chamber through the second discharge port, or (iii) during a period from the point of time when the second compression chamber reaches the maximum volume to a point of time when a point of contact between the cylinder and the piston passes the second suction port as the shaft rotates. 3. The rotary compressor according to claim 1, wherein the second suction port has a smaller opening area than the first suction port. 4. The rotary compressor according to claim 1, wherein the second discharge port has a smaller opening area than the first discharge port. 5. The rotary compressor according to claim 1, further comprising: a closed casing accommodating a compression mechanism, the compression mechanism including the cylinder, the piston, the first vane, and the second vane;a discharge pipe opening into an internal space of the closed casing;a discharge flow path connecting the internal space of the closed casing to each of the first discharge port and the second discharge port so that the working fluid discharged outside the first compression chamber through the first discharge port and the working fluid discharged outside the second compression chamber through the second discharge port flow into the discharge pipe through the internal space of the closed casing; anda motor disposed in the closed casing to be located in a flow path of the working fluid from the discharge flow path to the discharge pipe. 6. The rotary compressor according to claim 1, wherein the suction check valve includes a thin plate-like valve body having a back surface for closing the second suction port and a front surface to be exposed to an atmosphere in the second compression chamber when the second suction port is closed. 7. The rotary compressor according to claim 1, wherein the second suction port is provided so as to open into a groove communicating with the second compression chamber, andthe suction check valve has: (i) a thin plate-like valve body having a back surface for closing the second suction port and a front surface to be exposed to an atmosphere in the second compression chamber when the second suction port is closed, the valve body being disposed in the groove so as to open and close the second suction port; and (ii) a valve stopper having a supporting surface for limiting an amount of displacement of the valve body in a thickness direction thereof when the second suction port is opened, the valve stopper being disposed in the groove so that the supporting surface is exposed to the atmosphere in the second compression chamber when the valve body closes the second suction port. 8. The rotary compressor according to claim 1, wherein when the cylinder is defined as a first cylinder and the piston is defined as a first piston, the rotary compressor further comprises: a second cylinder disposed concentrically with the first cylinder;a second piston disposed within the second cylinder and fitted to the shaft;a third vane for dividing a space between the second cylinder and the second piston along a circumferential direction of the second piston so that a third compression chamber is formed within the second cylinder;a third suction port for introducing the working fluid to be compressed in the third compression chamber into the third compression chamber; anda third discharge port for discharging the working fluid compressed in the third compression chamber outside the third compression chamber from the third compression chamber. 9. The rotary compressor according to claim 8, wherein the first compression chamber has a smaller volume than the third compression chamber. 10. The rotary compressor according to claim 1, wherein when the cylinder is defined as a first cylinder and the piston is defined as a first piston, the rotary compressor further comprises: a second cylinder disposed concentrically with the first cylinder;a second piston disposed within the second cylinder so as to form a second space between the second piston itself and the second cylinder and fitted to the shaft;a third vane for dividing the second space along a circumferential direction of the second piston, the third vane being attached to the second cylinder at a third angular position along the rotation direction of the shaft;a fourth vane for further dividing the second space divided by the third vane so that a third compression chamber and a fourth compression chamber having a smaller volume than the third compression chamber are formed within the second cylinder, the fourth vane being attached to the second cylinder at a fourth angular position along the rotation direction of the shaft;a third suction port for introducing the working fluid to be compressed in the third compression chamber into the third compression chamber;a third discharge port for discharging the working fluid compressed in the third compression chamber outside the third compression chamber from the third compression chamber;a fourth suction port for introducing the working fluid to be compressed in the fourth compression chamber into the fourth compression chamber;a fourth discharge port for discharging the working fluid compressed in the fourth compression chamber outside the fourth compression chamber from the fourth compression chamber; anda second suction check valve provided in the fourth suction port. 11. The rotary compressor according to claim 10, wherein the fourth compression chamber has a larger volume than the second compression chamber. 12. The rotary compressor according to claim 8, wherein the shaft includes a first eccentric portion to which the first piston is fitted and a second eccentric portion to which the second piston is fitted, andan angular difference between a direction in which the first eccentric portion projects and a direction in which the second eccentric portion projects is 180 degrees in the rotation direction of the shaft. 13. A refrigeration cycle apparatus comprising: the rotary compressor according to claim 1;a radiator for cooling the working fluid compressed in the rotary compressor;an expansion mechanism for expanding the working fluid cooled in the radiator;a gas-liquid separator for separating the working fluid expanded in the expansion mechanism into a gas phase working fluid and a liquid phase working fluid;an evaporator for evaporating the liquid phase working fluid separated in the gas-liquid separator;a suction flow path for introducing the working fluid that has flowed out of the evaporator into the first suction port of the rotary compressor; andan injection flow path for introducing the gas phase working fluid separated in the gas-liquid separator into the second suction port of the rotary compressor. 14. The refrigeration cycle apparatus according to claim 13, wherein the rotary compressor is the rotary compressor according to claim 8, andthe suction flow path includes a branch portion extending toward the first suction port and a branch portion extending toward the third suction port so that the working fluid that has flowed out of the evaporator is introduced into both the first suction port and the third suction port of the rotary compressor. 15. A refrigeration cycle apparatus comprising: the rotary compressor according to claim 10;a radiator for cooling the working fluid compressed in the rotary compressor;a first expansion mechanism for expanding the working fluid cooled in the radiator;a first gas-liquid separator for separating the working fluid expanded in the first expansion mechanism into a gas phase working fluid and a liquid phase working fluid;a second expansion mechanism for expanding the liquid phase working fluid separated in the first gas-liquid separator;a second gas-liquid separator for separating the working fluid expanded in the second expansion mechanism into a gas phase working fluid and a liquid phase working fluid;an evaporator for evaporating the liquid phase working fluid separated in the second gas-liquid separator;a suction flow path for introducing the working fluid that has flowed out of the evaporator into each of the first suction port and the third suction port of the rotary compressor;a first injection flow path for introducing the gas phase working fluid separated in the first gas-liquid separator into the second suction port of the rotary compressor; anda second injection flow path for introducing the gas phase working fluid separated in the second gas-liquid separator into the fourth suction port of the rotary compressor. 16. The rotary compressor according to claim 7, wherein the groove is formed in the cylinder so as to extend outwardly in a radial direction of the cylinder.
Hiwata, Akira; Ogata, Takeshi; Shii, Kentaro, Refrigeration cycle device capable of efficiently varying capacity providing a first and a second compressing mechanism disposed in a hermetic container.
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