Rotary compressor and refrigeration device

Abstract

To increase a distance between a first suction pipe and a second suction pipe.SOLUTION: A first suction pipe (15) is connected to a first cylinder (40). The first suction pipe (15) sucks fluid into a first cylinder chamber (41). A rear head (33) is provided with a head side suction passage (70) communicating with a second cylinder chamber (51). A second suction pipe (16) is connected to the rear head (33). The second suction pipe (16) sucks the fluid into the second cylinder chamber (51) via the head side suction passage (70).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a rotary compressor and a refrigeration device. [Background technology]

[0002] Patent Document 1 discloses a compressor including a front head, a first cylinder having a first cylinder chamber, a partition plate, a second cylinder having a second cylinder chamber, and a rear head. A first suction pipe and a second suction pipe are connected to the first cylinder and the second cylinder, respectively. Refrigerant gas is drawn into the first cylinder chamber and the second cylinder chamber from an accumulator through the first suction pipe and the second suction pipe, respectively. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-072807 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in order to increase the efficiency of the compressor, there is a demand to reduce the thickness of the first cylinder and the second cylinder, thereby reducing leakage loss.

[0005] However, reducing the thickness of the first and second cylinders reduces the distance between the first and second suction pipes, which may reduce the strength of the area around the connection between the first and second suction pipes in the casing.

[0006] An object of the present disclosure is to increase the compressor efficiency and increase the distance between the first and second suction pipes. [Means for solving the problem]

[0007] A first aspect of the present disclosure is a rotary compressor in which a first head (31), a first cylinder (40) having a first cylinder chamber (41), a middle plate (32), a second cylinder (50) having a second cylinder chamber (51), and a second head (33) are stacked, and a first piston (45) and a second piston (55) are eccentrically rotated in the first cylinder chamber (41) and the second cylinder chamber (51), respectively. The rotary compressor includes: a first suction pipe (15) connected to the first cylinder (40) and drawing fluid into the first cylinder chamber (41); a head-side suction passage (70) provided in the second head (33) and communicating with the second cylinder chamber (51); and a second suction pipe (16) connected to the second head (33) and drawing fluid into the second cylinder chamber (51) via the head-side suction passage (70).

[0008] In the first aspect, the distance between the first suction pipe (15) and the second suction pipe (16) can be increased compared to when the second cylinder (50) is connected to the second suction pipe (16). This allows the thicknesses of the first cylinder (40) and the second cylinder (50) to be reduced, thereby reducing leakage loss and improving the efficiency of the rotary compressor.

[0009] A second aspect of the present disclosure is a rotary compressor of the first aspect, wherein the first head (31) is provided with a threaded hole (36), and the first cylinder (40), the middle plate (32), the second cylinder (50), and the second head (33) are each provided with a through hole (37) at a position corresponding to the threaded hole (36), and a bolt (35) is inserted from the second head (33) side to fasten the first head (31), the first cylinder (40), the middle plate (32), the second cylinder (50), and the second head (33).

[0010] In the second mode, in the second cylinder (50) near the seating surface of the bolt (35), the fastening strain of the second cylinder (50) due to the tightening of the bolt (35) is larger than the fastening strain of the first cylinder (40). On the other hand, by drawing the fluid into the second cylinder (50) from the second head (33) side, the low-temperature fluid is heated when passing through the head-side intake passage (70), and the difference in temperature distribution between the second cylinder (50) and the fluid is reduced, so that the thermal strain of the second cylinder (50) due to thermal expansion is smaller than the thermal strain of the first cylinder (40).

[0011] In this way, in the second cylinder (50) close to the seating surface of the bolt (35), the gap between the second cylinder (50) and the second piston (55) is set small in consideration of the effects of fastening strain and thermal strain, thereby making it possible to reduce leakage loss.

[0012] A third aspect of the present disclosure is a rotary compressor of the first aspect, wherein the first cylinder (40) is provided with a threaded hole (36), and the middle plate (32), the second cylinder (50), and the second head (33) are each provided with a through hole (37) at a position corresponding to the threaded hole (36), and a bolt (35) is inserted from the second head (33) side to fasten the first cylinder (40), the middle plate (32), the second cylinder (50), and the second head (33).

[0013] In the third aspect, in the second cylinder (50) near the seating surface of the bolt (35), the gap between the second cylinder (50) and the second piston (55) is set small in consideration of the effects of fastening strain and thermal strain, thereby reducing leakage loss.

[0014] A fourth aspect of the present disclosure is a rotary compressor according to any one of the first to third aspects, wherein the head-side suction passage (70) has a first passage (71) extending radially and a second passage (72) extending axially and connecting the first passage (71) with the second cylinder chamber (51).

[0015] In the fourth aspect, the low-temperature fluid that has flowed from the second suction pipe (16) into the head-side suction passage (70) is heated while passing through the first passage (71) and the second passage (72), and then flows radially into the second cylinder chamber (51). This makes it possible to prevent the low-temperature fluid from being directly sprayed against the second piston (55).

[0016] A fifth aspect of the present disclosure is a refrigeration system including the rotary compressor (10) of any one of the first to third aspects and a fluid circuit (1a) through which a fluid compressed by the rotary compressor (10) flows.

[0017] In a fifth aspect, a refrigeration system including a rotary compressor (10) can be provided. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a refrigerant circuit diagram showing the configuration of the refrigeration device of the first embodiment. [Figure 2] FIG. 2 is a vertical cross-sectional view showing the configuration of the rotary compressor. [Figure 3] FIG. 3 is a cross-sectional plan view showing the configuration of the first cylinder and the first piston. [Figure 4] FIG. 4 is a cross-sectional plan view showing the configuration of the second cylinder and the second piston. [Figure 5] FIG. 5 is a vertical cross-sectional view showing the configuration of a rotary compressor according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] First Embodiment As shown in Fig. 1, the rotary compressor (10) is provided in a refrigeration system (1). The refrigeration system (1) has a refrigerant circuit (1a) as a fluid circuit filled with a refrigerant. The refrigerant circuit (1a) has the rotary compressor (10), a radiator (3), a pressure reduction mechanism (4), and an evaporator (5). The pressure reduction mechanism (4) is, for example, an expansion valve. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle.

[0020] The refrigeration system (1) is an air conditioner. The air conditioner may be a cooling-only unit, a heating-only unit, or an air conditioner that switches between cooling and heating. In this case, the air conditioner has a switching mechanism (e.g., a four-way switching valve) that switches the refrigerant circulation direction. The refrigeration system (1) may be a water heater, a chiller unit, a cooling device that cools the air inside a storage unit, or the like. A cooling device cools the air inside a refrigerator, a freezer, a container, or the like.

[0021] 2, the rotary compressor (10) includes a casing (11), a drive mechanism (20), and a compression mechanism (30). The drive mechanism (20) and the compression mechanism (30) are housed inside the casing (11).

[0022] The casing (11) is a vertically elongated cylindrical sealed container. The casing (11) has a body (12), a lower head (13), and an upper head (14). The body (12) is formed in a cylindrical shape that extends vertically and is open at both ends in the axial direction. The lower head (13) is fixed to the lower end of the body (12). The upper head (14) is fixed to the upper end of the body (12).

[0023] A first suction pipe (15) and a second suction pipe (16) are fixed to pass through the body (12). A discharge pipe (17) is fixed to pass through the upper head (14).

[0024] An oil reservoir (18) is provided at the bottom of the casing (11). The oil reservoir (18) is formed by the lower head (13) and the inner wall of the lower part of the body (12). Oil for lubricating sliding parts of the compression mechanism (30) and the drive shaft (25) is stored in the oil reservoir (18).

[0025] <Drive mechanism> The drive mechanism (20) includes a motor (21) and a drive shaft (25). The motor (21) is disposed above the compression mechanism (30). The motor (21) includes a stator (22) and a rotor (23).

[0026] The stator (22) is fixed to the inner circumferential surface of the body (12) of the casing (11). The rotor (23) extends vertically through the interior of the stator (22). A drive shaft (25) is fixed to the axial center of the rotor (23). When the motor (21) is energized, the drive shaft (25) is rotated together with the rotor (23).

[0027] The drive shaft (25) is disposed on the axis of the body (12) of the casing (11). An oil supply pump (25a) is provided at the lower end of the drive shaft (25). The oil supply pump (25a) delivers oil stored in the oil reservoir (18). The delivered oil is supplied to the compression mechanism (30) and the sliding parts of the drive shaft (25) through an oil passage (25b) inside the drive shaft (25).

[0028] The drive shaft (25) has a main shaft portion (26), a first eccentric portion (27), and a second eccentric portion (28). An upper portion of the main shaft portion (26) is fixed to the rotor (23) of the motor (21). The first eccentric portion (27) is disposed above the second eccentric portion (28). The axes of the first eccentric portion (27) and the second eccentric portion (28) are eccentric from the axis of the main shaft portion (26) by a predetermined amount.

[0029] The main shaft portion (26) above the first eccentric portion (27) is rotatably supported by a front head (31) described later. The main shaft portion (26) below the second eccentric portion (28) is rotatably supported by a rear head (33) described later.

[0030] <Compression mechanism> 2, the compression mechanism (30) is a two-cylinder rotary fluid machine. The compression mechanism (30) is disposed below the motor (21). The compression mechanism (30) has a front head (31) as a first head, a first cylinder (40), a middle plate (32), a second cylinder (50), and a rear head (33) as a second head.

[0031] The front head (31), the first cylinder (40), the middle plate (32), the second cylinder (50), and the rear head (33) are stacked in order from top to bottom and fixed by bolts (35).

[0032] Specifically, the front head (31) is provided with a screw hole (36). The first cylinder (40), the middle plate (32), the second cylinder (50), and the rear head (33) are each provided with a through hole (37) at a position corresponding to the screw hole (36).

[0033] The bolts (35) are inserted from the rear head (33) side and fasten the front head (31), the first cylinder (40), the middle plate (32), the second cylinder (50), and the rear head (33).

[0034] The front head (31) is fixed to the body portion (12) of the casing (11). The front head (31) is stacked on top of the first cylinder (40). The front head (31) is arranged so as to cover the first cylinder chamber (41) of the first cylinder (40) from above. The main shaft portion (26) of the drive shaft (25) is inserted through the center of the front head (31). The front head (31) rotatably supports the drive shaft (25). A first discharge passage (49) (see FIG. 3) is formed in the front head (31) and passes through it in the axial direction.

[0035] The first cylinder (40) is formed of a flat, substantially annular member. As shown in Fig. 3, the first cylinder (40) has a first cylinder chamber (41), a first suction passage (42), and a first blade storage chamber (43).

[0036] The first cylinder chamber (41) is provided in the center of the first cylinder (40). The first suction passage (42) extends from the inner wall surface of the first cylinder chamber (41) toward the outside in the radial direction of the first cylinder (40). The first suction passage (42) opens to the outer surface of the first cylinder (40). The first suction pipe (15) is connected to the inflow end of the first suction passage (42). The outflow end of the first suction passage (42) communicates with the first cylinder chamber (41).

[0037] The first cylinder chamber (41) accommodates a first piston (45). The first piston (45) has a first piston body (46) and a first blade (47). The first piston body (46) is formed in an annular shape. The first eccentric portion (27) of the drive shaft (25) is fitted inside the first piston body (46). The first blade (47) extends radially outward from the first piston body (46). The first blade (47) is supported by a pair of first bushings (48). The inside of the first cylinder chamber (41) is divided into a low-pressure chamber and a high-pressure chamber by the first blade (47).

[0038] The first piston (45) rotates eccentrically in the first cylinder chamber (41) as the drive shaft (25) is driven to rotate. As the volume of the low-pressure chamber increases gradually with the eccentric rotation of the first piston (45), the refrigerant flowing through the first suction pipe (15) is sucked radially from the first suction passage (42) into the low-pressure chamber.

[0039] Next, when the low-pressure chamber is isolated from the first suction passage (42), the isolated space forms a high-pressure chamber. As the volume of the high-pressure chamber gradually decreases, the internal pressure of the high-pressure chamber increases. When the internal pressure of the high-pressure chamber exceeds a predetermined pressure, the refrigerant in the high-pressure chamber flows out of the compression mechanism (30) through the first discharge passage (49). This high-pressure refrigerant flows upward through the internal space of the casing (11) and passes through a core cut (not shown) of the motor (21) and the like. The high-pressure refrigerant that has flowed out above the motor (21) is sent to the refrigerant circuit through the discharge pipe (17).

[0040] The first blade housing chamber (43) is provided at a position radially outwardly spaced from the first cylinder chamber (41). The first blade housing chamber (43) penetrates the first cylinder (40) in the thickness direction. The first blade housing chamber (43) houses the tip end of the first blade (47). The first blade (47) swings in the first blade housing chamber (43) in association with the eccentric rotation of the first piston body (46).

[0041] 2, the middle plate (32) is sandwiched between the first cylinder (40) and the second cylinder (50). The middle plate (32) is arranged so as to cover the first cylinder chamber (41) of the first cylinder (40) from below. The middle plate (32) is arranged so as to cover the second cylinder chamber (51) of the second cylinder (50) from above.

[0042] 4, the second cylinder (50) is formed of a flat, substantially annular member and includes a second cylinder chamber (51), a second suction passage (52), and a second blade storage chamber (53).

[0043] The second cylinder chamber (51) is provided in the center of the second cylinder (50). The second suction passage (52) extends from the inner wall surface of the second cylinder chamber (51) toward the outside in the radial direction of the second cylinder (50). The second suction passage (52) opens to the surface on the rear head (33) side (the lower surface in FIG. 2).

[0044] An inflow end of the second suction passage (52) communicates with a head-side suction passage (70) of the rear head (33), which will be described later. An outflow end of the second suction passage (52) communicates with the second cylinder chamber (51).

[0045] The second cylinder chamber (51) accommodates a second piston (55). The second piston (55) has a second piston body (56) and a second blade (57). The second piston body (56) is formed in an annular shape. The second eccentric portion (28) of the drive shaft (25) is fitted inside the second piston body (56). The second blade (57) extends radially outward from the second piston body (56). The second blade (57) is supported by a pair of second bushings (58). The interior of the second cylinder chamber (51) is divided into a low-pressure chamber and a high-pressure chamber by the second blade (57).

[0046] The operation of the second piston (55) is substantially the same as the operation of the first piston (45), and therefore, a description thereof will be omitted.

[0047] The second blade housing chamber (53) is provided at a position radially outwardly spaced from the second cylinder chamber (51). The second blade housing chamber (53) penetrates the second cylinder (50) in the thickness direction. The tip of the second blade (57) is housed in the second blade housing chamber (53). The second blade (57) swings in the second blade housing chamber (53) in association with the eccentric rotation of the second piston body (56).

[0048] As shown in Figure 2, the rear head (33) is stacked below the second cylinder (50). The rear head (33) is arranged so as to cover the second cylinder chamber (51) of the second cylinder (50) from below. The main shaft portion (26) of the drive shaft (25) is inserted into the center of the rear head (33). The rear head (33) rotatably supports the drive shaft (25).

[0049] The rear head (33) is provided with a head-side suction passage (70). The head-side suction passage (70) has a first passage (71) and a second passage (72). The first passage (71) extends radially outward from the rear head (33). The first passage (71) opens to the outer surface of the rear head (33). The second suction pipe (16) is connected to the inflow end of the first passage (71). The second passage (72) is provided to the outflow end of the first passage (71).

[0050] The second passage (72) extends axially upward and opens at the upper surface of the rear head (33). The outlet end of the second passage (72) communicates with the second cylinder chamber (51) through the second suction passage (52) of the second cylinder (50).

[0051] With this configuration, the distance between the first suction pipe (15) and the second suction pipe (16) can be increased compared to when the second cylinder (50) is connected to the second suction pipe (16). This allows the thicknesses of the first cylinder (40) and the second cylinder (50) to be reduced, thereby reducing leakage loss and improving the efficiency of the rotary compressor (10).

[0052] The low-temperature refrigerant that has flowed from the second suction pipe (16) into the head-side suction passage (70) is heated while passing through the first passage (71) and the second passage (72), and then flows into the second cylinder chamber (51). This makes it possible to prevent the low-temperature refrigerant from being directly sprayed against the second piston (55).

[0053] As indicated by the arrows in FIG. 2, refrigerant is drawn into the second cylinder chamber (51) through the second suction pipe (16), the head-side suction passage (70) of the rear head (33), and the second suction passage (52) of the second cylinder (50).

[0054] A second discharge passage (59) (see FIG. 4) is formed in the rear head (33) and passes through it in the axial direction. When the internal pressure of the high-pressure chamber of the second cylinder chamber (51) exceeds a predetermined pressure as the second piston (55) rotates, the refrigerant in the high-pressure chamber flows out of the compression mechanism (30) through the second discharge passage (59).

[0055] The bolts (35) are inserted into the through holes (37) from the rear head (33) side and fastened to the threaded holes (36) of the front head (31). Therefore, in the second cylinder (50) close to the seating surface of the bolts (35), the fastening strain δ3 of the second cylinder (50) caused by the fastening of the bolts (35) is larger than the fastening strain δ1 of the first cylinder (40) (δ1<δ3).

[0056] On the other hand, by drawing the fluid into the second cylinder (50) from the second head (33) side, the low-temperature fluid is heated when passing through the head-side suction passage (70), the difference in temperature distribution between the second cylinder (50) and the fluid becomes smaller, and the thermal strain δ4 of the second cylinder (50) due to thermal expansion becomes smaller than the thermal strain δ2 of the first cylinder (40) (δ2>δ4).

[0057] In this way, in the second cylinder (50) close to the seating surface of the bolt (35), the gap between the second cylinder (50) and the second piston (55) is set small in consideration of the effects of fastening strain and thermal strain, thereby making it possible to reduce leakage loss.

[0058] <Configuration of accumulator> An accumulator (60) is connected upstream of the rotary compressor (10). The accumulator (60) temporarily stores the refrigerant before it is sucked into the rotary compressor (10), and separates the liquid refrigerant and oil contained in the gas refrigerant into gas and liquid.

[0059] The accumulator (60) includes a sealed container (61), an inlet pipe (62), a first outlet pipe (63), and a second outlet pipe (64). The inlet pipe (62) allows the refrigerant to flow into the sealed container (61). The outlet pipe (63) allows the refrigerant to flow out of the sealed container (61).

[0060] The sealed container (61) is made of a vertically long cylindrical member. An inlet pipe (62) is connected to the top of the sealed container (61). The lower end of the inlet pipe (62) opens at a position near the top of the internal space of the sealed container (61).

[0061] A first outlet pipe (63) and a second outlet pipe (64) are connected to the lower part of the sealed container (61). The upper ends of the first outlet pipe (63) and the second outlet pipe (64) extend upward inside the sealed container (61) and open at positions near the top of the internal space of the sealed container (61).

[0062] The lower end of the first outlet pipe (63) extends downward from the lower end of the sealed container (61), then bends toward the first suction pipe (15) of the rotary compressor (10), and is connected to the first suction pipe (15). The lower end of the second outlet pipe (64) extends downward from the lower end of the sealed container (61), then bends toward the second suction pipe (16) of the rotary compressor (10), and is connected to the second suction pipe (16).

[0063] -Effects of the first embodiment- According to the features of the present embodiment, the distance between the first suction pipe (15) and the second suction pipe (16) can be increased compared to when the second cylinder (50) is connected to the second suction pipe (16). This allows the thicknesses of the first cylinder (40) and the second cylinder (50) to be reduced, thereby reducing leakage loss and improving the efficiency of the rotary compressor.

[0064] Furthermore, by connecting the first suction pipe (15) to the first cylinder (40), it is possible to reduce the amount of suction heating of the refrigerant in the first cylinder chamber (41). This improves the efficiency of the rotary compressor (10) compared to when the first suction pipe (15) is connected to the first head (31) and the second suction pipe (16) is connected to the second head (33).

[0065] According to the features of this embodiment, in the second cylinder (50) near the seating surface of the bolt (35), the fastening strain of the second cylinder (50) due to the tightening of the bolt (35) is larger than the fastening strain of the first cylinder (40). On the other hand, by drawing fluid into the second cylinder (50) from the second head (33) side, the low-temperature fluid is heated when passing through the head-side suction passage (70), and the difference in temperature distribution between the second cylinder (50) and the fluid is reduced, so that the thermal strain of the second cylinder (50) due to thermal expansion is smaller than the thermal strain of the first cylinder (40).

[0066] In this way, in the second cylinder (50) close to the seating surface of the bolt (35), the gap between the second cylinder (50) and the second piston (55) is set small in consideration of the effects of fastening strain and thermal strain, thereby making it possible to reduce leakage loss.

[0067] Furthermore, in the first cylinder (40) disposed near the first head (31) provided with the screw hole (36), the first suction pipe (15) is connected to the first cylinder (40), thereby reducing refrigerant suction pressure loss, thereby reducing losses in the entire compression mechanism (30) and improving the efficiency of the rotary compressor (10).

[0068] According to the features of the present embodiment, the low-temperature fluid that has flowed from the second suction pipe (16) into the head-side suction passage (70) is heated while passing through the first passage (71) and the second passage (72), and then flows radially into the second cylinder chamber (51). This makes it possible to prevent the low-temperature fluid from being directly sprayed against the second piston (55).

[0069] According to a feature of the present embodiment, a refrigeration system includes a rotary compressor (10) and a fluid circuit (1a) through which a fluid compressed by the rotary compressor (10) flows, thereby providing a refrigeration system including the rotary compressor (10).

[0070] Second Embodiment Hereinafter, the same parts as those in the first embodiment will be denoted by the same reference numerals, and only the differences will be described.

[0071] As shown in Fig. 5, the compression mechanism (30) is disposed below the motor (21). The compression mechanism (30) includes a front head (31), a first cylinder (40), a middle plate (32), a second cylinder (50), and a rear head (33).

[0072] The front head (31), the first cylinder (40), the middle plate (32), the second cylinder (50), and the rear head (33) are stacked in order from top to bottom and fixed by bolts (35).

[0073] Specifically, a threaded hole (36) is provided in the first cylinder (40). A through hole (37) is provided in each of the front head (31), the middle plate (32), the second cylinder (50), and the rear head (33) at a position corresponding to the threaded hole (36). A counterbore hole is provided in the front head (31) at a position corresponding to the through hole (37).

[0074] The lower bolt (35) is inserted from the rear head (33) side and fastens the first cylinder (40), the middle plate (32), the second cylinder (50), and the rear head (33). The upper bolt (35) is inserted from the front head (31) side and fastens the front head (31) and the first cylinder (40).

[0075] -Effects of the second embodiment- According to the features of this embodiment, in the second cylinder (50) near the seating surface of the bolt (35), the gap between the second cylinder (50) and the second piston (55) is set small in consideration of the effects of fastening strain and thermal strain, thereby making it possible to reduce leakage loss.

[0076] Other Embodiments Although the embodiments and modifications have been described above, it will be understood that various modifications in form and detail are possible without departing from the spirit and scope of the claims. Furthermore, elements of the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate. Furthermore, the terms "first," "second," "third," etc. in the specification and claims are used to distinguish between terms to which these terms are attached, and do not limit the number or order of those terms. [Industrial Applicability]

[0077] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for rotary compressors and refrigeration devices. [Explanation of symbols]

[0078] 1 Refrigeration equipment 1a Fluid circuit 10 Rotary Compressor 15 1st suction pipe 16 2nd suction pipe 31 Front head (first head) 32 Middle Plate 33 Rear head (second head) 35 volts 36 screw holes 37 Through hole 40 No. 1 cylinder 41 First cylinder chamber 45 First piston 50 No. 2 cylinder 51 Second cylinder chamber 55 Second piston 70 Head side intake passage 71 1st aisle 72 2nd aisle

Claims

1. A rotary compressor including a first head (31), a first cylinder (40) having a first cylinder chamber (41), a middle plate (32), a second cylinder (50) having a second cylinder chamber (51), and a second head (33) stacked one on top of the other, and in which a first piston (45) and a second piston (55) are eccentrically rotated in the first cylinder chamber (41) and the second cylinder chamber (51), respectively, The first cylinder (40) is annular and defines the first cylinder chamber (41) therein. The first cylinder chamber (41) is formed from one end to the other end in the axial direction of the first cylinder (40), the first head (31) is formed separately from the first cylinder (40) and is arranged to cover the first cylinder chamber (41); The second cylinder (50) is annular and defines the second cylinder chamber (51) therein. the second head (33) is disposed so as to cover the second cylinder chamber (51); a first suction pipe (15) connected to the radially outer side of the first cylinder (40) and adapted to draw fluid into the first cylinder chamber (41); a head-side suction passage (70) provided in the second head (33) and communicating with the second cylinder chamber (51); a second suction pipe (16) connected to the second head (33) and adapted to draw fluid into the second cylinder chamber (51) through the head-side suction passage (70), The head-side suction passage (70) has a first passage (71) extending toward the outer peripheral surface of the second head (33), and a second passage (72) extending in the axial direction, opening on a surface on the second cylinder (50) side, and communicating the first passage (71) with the second cylinder chamber (51). Rotary compressor.

2. 2. The rotary compressor of claim 1, The first head (31) is provided with a screw hole (36), the first cylinder (40), the middle plate (32), the second cylinder (50), and the second head (33) are each provided with a through hole (37) at a position corresponding to the screw hole (36); a bolt (35) inserted from the second head (33) side and fastening the first head (31), the first cylinder (40), the middle plate (32), the second cylinder (50), and the second head (33) together; Rotary compressor.

3. 2. The rotary compressor of claim 1, The first cylinder (40) is provided with a screw hole (36), The middle plate (32), the second cylinder (50), and the second head (33) are each provided with a through hole (37) at a position corresponding to the screw hole (36), a bolt (35) inserted from the second head (33) side and fastening the first cylinder (40), the middle plate (32), the second cylinder (50), and the second head (33) together; Rotary compressor.

4. A rotary compressor (10) according to any one of claims 1 to 3; a fluid circuit (1a) through which the fluid compressed by the rotary compressor (10) flows. Refrigeration equipment.

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