Rotary compressor and refrigeration device

Abstract

A first head (31) has a first discharge port (49). A first discharge valve (60) opens and closes the first discharge port (49). A first fixing part (61) fixes a proximal end portion of the first discharge valve (60) to the first head (31). A cylinder (70) has a vane chamber (73) that accommodates a vane (77) and has a first center line (L1). When viewed from a first direction, the first head (31) is partitioned into a first region on a suction space side of the first center line (L1) and a second region on a discharge space side of the first center line (L1). The first fixing part (61) is disposed in the first region of the first head (31).

Description

Rotary Compressor and Refrigeration Device

[0001] The present disclosure relates to a rotary compressor and a refrigeration device. A rotary compressor is a compressor that compresses gas in a compression chamber formed in a cylinder by eccentrically rotating a roller in the cylinder. A rotary compressor generally has a vane for partitioning the compression chamber. The rotary compressor includes a so-called rolling piston type in which a vane separate from the roller contacts the roller while the roller rotates eccentrically, a so-called swing type in which a vane integrally formed with the roller swings as the roller rotates eccentrically, a so-called hinge vane type in which the tip of the vane is rotatably fitted into a recess on the outer peripheral surface of the roller and the roller rotates eccentrically, and the like.

[0002] Patent Document 1 discloses a compressor provided with a discharge valve that opens and closes a discharge port of a head (end face member). The base end portion of the discharge valve is fixed to the head by a fastening member.

[0003] Japanese Patent Application Laid-Open No. 2009-047018

[0004] By the way, in the invention of Patent Document 1, a recess for accommodating the discharge valve and the fastening member is formed in the head, and the wall thickness at the fixing position of the fastening member in the head becomes small. Therefore, especially when the wall thickness of the head becomes small on the discharge side where the refrigerant pressure is high, the head may be distorted.

[0005] An object of the present disclosure is to suppress the head from being distorted by appropriately setting the fixing position of the discharge valve.

[0006] A first aspect of the present disclosure includes a rotating shaft (25) extending in a first direction, a first head (31) that pivots on the rotating shaft (25) and has a first discharge port (49) for discharging refrigerant, a cylinder (70) having a cylinder chamber (71) and positioned adjacent to the first head (31), a roller (76) fixed to the rotating shaft (25) and rotating eccentrically within the cylinder chamber (71), a vane (77) that divides the cylinder chamber (71) into an intake space and a discharge space, a second head (33) that pivots on the rotating shaft (25) and is positioned on the opposite side of the cylinder (70) from the first head (31), and the first The rotary compressor comprises a first discharge valve (60) for opening and closing a discharge port (49), and a first fixing part (61) for fixing the base end of the first discharge valve (60) to the first head (31), wherein the cylinder (70) has a vane chamber (73) that houses the vanes (77) and has a first centerline (L1), the first head (31) is divided into a first region on the suction space side of the first centerline (L1) and a second region on the discharge space side of the first centerline (L1) when viewed from the first direction, and the first fixing part (61) is positioned in the first region of the first head (31).

[0007] In the first embodiment, by positioning the first fixing portion (61) in the first region of the first head (31), sufficient wall thickness of the first head (31) can be ensured in the second region where the refrigerant pressure is high, thereby preventing the first head (31) from becoming distorted.

[0008] A second aspect of the present disclosure is a rotary compressor of the first aspect, comprising fastening bolts (35) for fastening the first head (31), the cylinder (70), and the second head (33), wherein the first angle θ1 formed by the line connecting the center of the first fixed part (61) and the center (O) of the rotation axis (25) and the first center line (L1) is greater than the second angle θ2 formed by the line connecting the center of the fastening bolt (35) and the center (O) of the rotation axis (25) and the first center line (L1).

[0009] In the second embodiment, by positioning the first fixing part (61) at a position further away from the vane chamber (73) in the circumferential direction than the fastening bolt (35), the fixing position of the first fixing part (61) can be set to a position even further away from the second region where the refrigerant pressure is high.

[0010] A third aspect of the present disclosure is a rotary compressor according to the first or second aspect, wherein the first fixed portion (61) is positioned so as to not overlap with the intake passage (72) of the cylinder (70) when viewed from the first direction.

[0011] In a third embodiment, the first fixing portion (61) can be positioned so as not to penetrate the intake passage (72) of the cylinder (70).

[0012] A fourth aspect of the present disclosure is a rotary compressor of any one of the first to third aspects, wherein the cylinder (70) includes a first cylinder (40) having a first cylinder chamber (41) and a second cylinder (50) having a second cylinder chamber (51), and the vanes (77) include a first vane (47) and a second vane (57), and the first cylinder (40) has a first vane chamber (43) housing the first vane (47) and having a first centerline (L1), and the second Linda (50) has a second vane chamber (53) that houses the second vane (57) and has a second centerline (L2), and the second head (33) has a second discharge port (59) for discharging refrigerant and comprises a middle plate (32) disposed between the first cylinder (40) and the second cylinder (50), a second discharge valve (65) for opening and closing the second discharge port (59), and a second fixing part (66) for fixing the base end of the second discharge valve (65) to the second head (33).

[0013] In the fourth embodiment, the fixing positions of the first fixing part (61) and the second fixing part (66) can be appropriately set for a multi-cylinder rotary compressor equipped with a first cylinder (40) and a second cylinder (50).

[0014] A fifth aspect of the present disclosure is a rotary compressor of the fourth aspect, wherein the second head (33) is divided into a third region on the intake space side of the second centerline (L2) and a fourth region on the discharge space side of the second centerline (L2), as viewed from the first direction, the first fixed portion (61) is located in the first region of the first head (31), and the second fixed portion (66) is located in the fourth region of the second head (33).

[0015] In the fifth embodiment, by positioning the first fixing portion (61) in the first region of the first head (31), sufficient wall thickness of the first head (31) can be ensured in the second region where the refrigerant pressure is high, thereby preventing the first head (31) from becoming distorted.

[0016] A sixth aspect of the present disclosure is a rotary compressor of the fourth aspect, wherein the second head (33) is divided, when viewed from the first direction, into a third region on the intake space side of the second centerline (L2) and a fourth region on the discharge space side of the second centerline (L2), the first fixed portion (61) is located in the first region of the first head (31), and the second fixed portion (66) is located in the third region of the second head (33).

[0017] In the sixth embodiment, the first fixing part (61) is positioned in the first region of the first head (31), while the second fixing part (66) is positioned in the third region of the second head (33). This ensures sufficient wall thickness of the first head (31) and the second head (33) in the second and fourth regions where the refrigerant pressure is high, thereby preventing the first head (31) and the second head (33) from becoming distorted.

[0018] A seventh aspect of the present disclosure is a rotary compressor of the sixth aspect, in which the third angle θ3 formed by the straight line connecting the center (O) of the rotating shaft (25) and the center of the tip of the first discharge valve (60) and the straight line connecting the center (O) of the rotating shaft (25) and the center of the first fixed part (61) is different from the fourth angle θ4 formed by the straight line connecting the center (O) of the rotating shaft (25) and the center of the tip of the second discharge valve (65) and the straight line connecting the center (O) of the rotating shaft (25) and the center of the second fixed part (66).

[0019] In the seventh embodiment, by making the third angle θ3 and the fourth angle θ4 different angles, the degree of design freedom regarding the arrangement of the first discharge valve (60) and the second discharge valve (65) can be increased.

[0020] An eighth aspect of the present disclosure is a rotary compressor in any one of the first to seventh aspects, wherein the first head (31) or the second head (33) has a radial passage (81) extending radially and an axial passage (82) communicating with the radial passage (81) and extending axially, and the suction passage (72) of the cylinder (70) is in communication with the axial passage (82).

[0021] In the eighth embodiment, by providing a radial passage (81) and an axial passage (82) in the first head (31) or the second head (33), it is not necessary to extend the intake passage (72) of the cylinder (70) radially outward, and sufficient wall thickness can be secured on the intake passage (72) side of the cylinder (70).

[0022] A ninth aspect of the present disclosure is a rotary compressor according to any one of the first to eighth aspects, wherein the refrigerant is carbon dioxide.

[0023] In the ninth embodiment, even when carbon dioxide, which exhibits large pressure fluctuations, is used as a refrigerant, the distortion of the first head (31) can be suppressed.

[0024] A tenth aspect of the present disclosure is a refrigeration system comprising a rotary compressor (10) of any one of the first to ninth aspects.

[0025] In a tenth embodiment, a refrigeration system equipped with a rotary compressor (10) can be provided.

[0026] Figure 1 is a refrigerant circuit diagram showing the configuration of the refrigeration system of this embodiment 1. Figure 2 is a longitudinal cross-sectional view showing the configuration of the rotary compressor. Figure 3 is a plan cross-sectional view showing the configuration of the first cylinder and the first roller. Figure 4 is a plan cross-sectional view showing the configuration of the second cylinder and the second roller. Figure 5 is a plan view showing the configuration of the front head. Figure 6 is a view of the rear head from below. Figure 7 is a view of the rear head of this embodiment 2 from below.

[0027] As shown in Figure 1, the rotary compressor (10) is installed in the refrigeration system (1). The refrigeration system (1) has a refrigerant circuit (1a) as a fluid circuit filled with refrigerant. In this embodiment, carbon dioxide is used as the refrigerant.

[0028] The refrigerant circuit (1a) includes a rotary compressor (10), a heat sink (3), a pressure reducing mechanism (4), and an evaporator (5). The pressure reducing mechanism (4) is, for example, an expansion valve. The refrigerant circuit (1a) performs a vapor compression type refrigeration cycle.

[0029] The refrigeration system (1) is an air conditioning system. The air conditioning system may be a cooling-only unit, a heating-only unit, or an air conditioning system that switches between cooling and heating. In this case, the air conditioning system has a switching mechanism (e.g., a four-way switching valve) that switches the direction of refrigerant circulation. The refrigeration system (1) may also be a water heater, a chiller unit, a cooling system that cools the air inside a storage unit, etc. The cooling system cools the air inside a refrigerator, freezer, container, etc.

[0030] As shown in Figure 2, the rotary compressor (10) comprises 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).

[0031] The casing (11) is a vertically elongated cylindrical sealed container. The suction pipe (16) is fixed through the body of the casing (11). The discharge pipe (17) is fixed through the top of the casing (11).

[0032] An accumulator (85) is connected to the suction pipe (16). The accumulator (85) temporarily stores the refrigerant before it is drawn into the rotary compressor (10) and separates the liquid refrigerant and oil contained in the gaseous refrigerant into gas and liquid forms.

[0033] An oil reservoir (18) is provided at the bottom of the casing (11). Oil is stored in the oil reservoir (18) to lubricate the sliding parts of the compression mechanism (30) and the rotating shaft (25).

[0034] <Drive mechanism> The drive mechanism (20) includes a motor (21) and a rotating shaft (25). The motor (21) is positioned above the compression mechanism (30). The motor (21) includes a stator (22) and a rotor (23).

[0035] The stator (22) is fixed to the inner circumferential surface of the casing (11). The rotor (23) extends vertically through the inside of the stator (22). A rotating shaft (25) is fixed inside the axial center of the rotor (23). When the motor (21) is energized, the rotating shaft (25) is rotated together with the rotor (23).

[0036] The rotating shaft (25) is positioned on the axis of the casing (11). The rotating shaft (25) extends in a first direction (up and down in Figure 2). An oil supply pump (25a) is provided at the lower end of the rotating shaft (25). The oil supply pump (25a) transports the oil stored in the oil reservoir (18). The transported oil is supplied to the compression mechanism (30) and the sliding parts of the rotating shaft (25) through an oil passage (25b) inside the rotating shaft (25).

[0037] The rotating shaft (25) has a main shaft portion (26), a first eccentric portion (27), and a second eccentric portion (28). The upper part of the main shaft portion (26) is fixed to the rotor (23) of the motor (21). The first eccentric portion (27) is positioned above the second eccentric portion (28). The axes of the first eccentric portion (27) and the second eccentric portion (28) are eccentric by a predetermined amount from the axis of the main shaft portion (26).

[0038] The portion of the main shaft (26) above the first eccentric portion (27) is rotatably supported by a front head (31), which will be described later. The portion of the main shaft (26) below the second eccentric portion (28) is rotatably supported by a rear head (33), which will be described later.

[0039] <Compression Mechanism> In the example shown in Figure 2, the compression mechanism (30) is a two-cylinder rotary fluid machine. The compression mechanism (30) is located below the motor (21).

[0040] The compression mechanism (30) includes a cylinder (70) having a cylinder chamber (71). A roller (76) is accommodated in the cylinder chamber (71). The cylinder (70) has an intake passage (72) for inhaling refrigerant and a vane chamber (73) for accommodating a vane (77).

[0041] The cylinder chamber (71) includes a first cylinder chamber (41) and a second cylinder chamber (51). The cylinder (70) includes a first cylinder (40) having the first cylinder chamber (41) and a second cylinder (50) having the second cylinder chamber (51). The intake passage (72) includes a first intake passage (42) for inhaling refrigerant into the first cylinder chamber (41) and a second intake passage (52) for inhaling refrigerant into the second cylinder chamber (51).

[0042] The roller (76) includes a first roller (46) accommodated in the first cylinder chamber (41) and a second roller (56) accommodated in the second cylinder chamber (51).

[0043] As shown in FIGS. 3 and 4, the vane chamber (73) includes a first vane chamber (43) provided in the first cylinder (40) and a second vane chamber (53) provided in the second cylinder (50). The vane (77) includes a first vane (47) accommodated in the first vane chamber (43) and a second vane (57) accommodated in the second vane chamber (53).

[0044] As shown in FIG. 2, 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.

[0045] The front head (31), the first cylinder (40), the middle plate (32), the second cylinder (50), and the rear head (33) are fixed by fastening bolts (35) in a state of being stacked in order from above to below.

[0046] Specifically, the front head (31) is provided with screw holes (36). Through holes (37) are provided at positions corresponding to the screw holes (36) in the first cylinder (40), the middle plate (32), the second cylinder (50), and the rear head (33), respectively.

[0047] The fastening bolt (35) is inserted from the side of the rear head (33) and fastens the front head (31), the first cylinder (40), the middle plate (32), the second cylinder (50), and the rear head (33).

[0048] The front head (31) is fixed to the casing (11). The front head (31) is laminated on the upper part 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 rotating shaft (25) is inserted through the central portion of the front head (31). The front head (31) pivotally supports the rotating shaft (25) rotatably. A first discharge port (49) (see FIG. 3) penetrating in the axial direction is formed in the front head (31).

[0049] The first cylinder (40) is formed of a flat and substantially annular member. The first cylinder (40) is arranged adjacent to the front head (31). As shown in FIG. 3, the first cylinder (40) has a first cylinder chamber (41), a first suction passage (42), a first vane chamber (43), and a first communication passage (44).

[0050] The first cylinder chamber (41) is provided at the central portion of the first cylinder (40). The first suction passage (42) extends axially from the lower surface of the first cylinder (40). The first suction passage (42) communicates with a head-side suction passage (80) described later. The first communication passage (44) communicates with the first suction passage (42) and the first cylinder chamber (41).

[0051] The first roller (46) is accommodated in the first cylinder chamber (41). The first roller (46) is formed in an annular shape. The first roller (46) is fixed to the first eccentric portion (27) of the rotating shaft (25). Specifically, the first eccentric portion (27) of the rotating shaft (25) is fitted inside the first roller (46).

[0052] The first vane (47) extends radially outward from the first roller (46). The first vane (47) is supported by a pair of first bushes (48). The interior of the first cylinder chamber (41) is divided into an intake space and a discharge space by the first vane (47).

[0053] The first roller (46) rotates eccentrically within the first cylinder chamber (41) as the rotating shaft (25) is driven. As the eccentric rotation of the first roller (46) gradually increases the volume of the intake space, the refrigerant flowing through the intake pipe (16) is drawn radially into the intake space from the first intake passage (42).

[0054] Next, when the intake space is blocked from the first intake passage (42), the blocked space becomes the discharge space. As the volume of the discharge space gradually decreases, the internal pressure of the discharge space increases. When the internal pressure of the discharge space exceeds a predetermined pressure, the refrigerant in the discharge space flows out of the compression mechanism (30) through the first discharge port (49). This high-pressure refrigerant flows upward through the internal space of the casing (11) and passes through the core cut (not shown) of the motor (21), etc. The high-pressure refrigerant that has flowed out above the motor (21) is sent to the refrigerant circuit from the discharge pipe (17).

[0055] The first vane chamber (43) is located radially outward from the first cylinder chamber (41). The first vane chamber (43) penetrates the first cylinder (40) in the thickness direction. The tip of the first vane (47) is housed in the first vane chamber (43). The first vane (47) oscillates within the first vane chamber (43) in accordance with the eccentric rotation of the first roller (46).

[0056] As shown in Figure 2, the middle plate (32) is sandwiched between the first cylinder (40) and the second cylinder (50). The middle plate (32) is positioned to cover the first cylinder chamber (41) of the first cylinder (40) from below. The middle plate (32) is positioned to cover the second cylinder chamber (51) of the second cylinder (50) from above.

[0057] A through hole (32a) is formed in the middle plate (32). The through hole (32a) communicates with the first intake passage (42) of the first cylinder (40) and the second intake passage (52) of the second cylinder (50), which will be described later.

[0058] As shown in Figure 4, the second cylinder (50) is formed from a flat, roughly annular member. The second cylinder (50) has a second cylinder chamber (51), a second intake passage (52), a second vane chamber (53), and a second connecting passage (54).

[0059] The second cylinder chamber (51) is located in the center of the second cylinder (50). The second intake passage (52) extends through the second cylinder (50) in the axial direction. The second intake passage (52) communicates with the head-side intake passage (80), which will be described later. The second communication passage (54) communicates with the second intake passage (52) and the second cylinder chamber (51).

[0060] A second roller (56) is housed in the second cylinder chamber (51). The second roller (56) is formed in an annular shape. The second roller (56) is fixed to the second eccentric portion (28) of the rotating shaft (25). Specifically, the second eccentric portion (28) of the rotating shaft (25) is fitted inside the second roller (56).

[0061] The second vane (57) extends radially outward from the second roller (56). The second vane (57) is supported by a pair of second bushes (58). The interior of the second cylinder chamber (51) is divided into an intake space and a discharge space by the second vane (57).

[0062] The operation of the second roller (56) is essentially the same as that of the first roller (46), so its explanation will be omitted.

[0063] The second vane chamber (53) is located radially outward from the second cylinder chamber (51). The second vane chamber (53) penetrates the second cylinder (50) in the thickness direction. The tip of the second vane (57) is housed in the second vane chamber (53). The second vane (57) oscillates within the second vane chamber (53) in accordance with the eccentric rotation of the second roller (56).

[0064] As shown in Figure 2, the rear head (33) is stacked on the lower part of the second cylinder (50). The rear head (33) is positioned to cover the second cylinder chamber (51) of the second cylinder (50) from below. The main shaft portion (26) of the rotating shaft (25) is inserted through the center of the rear head (33). The rear head (33) rotatably supports the rotating shaft (25).

[0065] The rear head (33) is provided with a head-side intake passage (80). The head-side intake passage (80) has a radial passage (81) and an axial passage (82). The radial passage (81) extends radially outward from the rear head (33). The radial passage (81) opens to the outer surface of the rear head (33). An intake pipe (16) is connected to the inlet end of the radial passage (81). An axial passage (82) is provided at the outlet end of the radial passage (81).

[0066] The axial passage (82) extends axially upward and opens onto the upper surface of the rear head (33). The outlet end of the axial passage (82) communicates with the second intake passage (52) of the second cylinder (50).

[0067] The refrigerant drawn into the head-side intake passage (80) of the rear head (33) flows through the second intake passage (52) of the second cylinder (50), the through-hole (32a) of the middle plate (32), and the first intake passage (42) of the first cylinder (40).

[0068] The first cylinder chamber (41) is drawn in refrigerant via the first intake passage (42) and the first connecting passage (44). The second cylinder chamber (51) is drawn in refrigerant via the second intake passage (52) and the second connecting passage (54).

[0069] A second discharge port (59) (see Figure 4) is formed in the rear head (33) that penetrates axially. As the second roller (56) rotates, when the internal pressure of the discharge space of the second cylinder chamber (51) exceeds a predetermined pressure, the refrigerant in the discharge space flows out to the outside of the compression mechanism (30) through the second discharge port (59).

[0070] <First Discharge Valve> As shown in Figure 5, a first discharge valve (60) is attached to the front head (31). The tip of the first discharge valve (60) opens and closes the first discharge port (49). The base end of the first discharge valve (60) is fixed to the front head (31) by a first fixing part (61). The first fixing part (61) is, for example, a rivet. The first fixing part (61) may also be a fastening bolt.

[0071] A first recess (62) is formed in the front head (31). The first recess (62) houses the first discharge valve (60) and the first fixing part (61).

[0072] <Second Discharge Valve> As shown in Figure 6, a second discharge valve (65) is attached to the rear head (33). The tip of the second discharge valve (65) opens and closes the second discharge port (59). The base end of the second discharge valve (65) is fixed to the rear head (33) by a second fixing part (66). The second fixing part (66) is, for example, a rivet. The second fixing part (66) may also be a fastening bolt.

[0073] A second recess (67) is formed in the rear head (33). The second discharge valve (65) and the second fixing part (66) are housed in the second recess (67).

[0074] <Regarding the fixing position of the first fixing part> The front head (31) has a first recess (62) that accommodates the first discharge valve (60) and the first fixing part (61), and the thickness of the front head (31) at the fixing position of the first fixing part (61) becomes small. Therefore, if the thickness of the front head (31) becomes small, especially on the discharge side where the refrigerant pressure is high, there is a risk that the front head (31) will become distorted.

[0075] Therefore, in this embodiment, the front head is prevented from becoming distorted by appropriately setting the fixing position of the first discharge valve (60).

[0076] Specifically, as shown in Figure 3, the first vane chamber (43) has a first centerline (L1). The first centerline (L1) is a straight line connecting the center (O) of the rotation axis (25) and the top dead center of the first roller (46) (position in Figure 3).

[0077] As shown in Figure 5, the front head (31) is divided into a first region on the intake space side of the first centerline (L1) and a second region on the discharge space side of the first centerline (L1), when viewed from the axial direction, which is the first direction. The first fixed part (61) is positioned in the first region of the front head (31). The first fixed part (61) is positioned so as not to overlap with the first intake passage (42) of the first cylinder (40), when viewed from the axial direction.

[0078] As shown in Figure 2, the front head (31), first cylinder (40), middle plate (32), second cylinder (50), and rear head (33) are fastened together by fastening bolts (35). The fastening bolts (35) are fastened into the threaded holes (36) of the front head (31).

[0079] Here, as shown in Figure 5, the first angle between the line connecting the center of the first fixing part (61) and the center (O) of the rotation axis (25) and the first center line (L1) is defined as θ1. The second angle between the line connecting the center of the fastening bolt (35) (shown as the center of the screw hole (36) in Figure 5) and the center (O) of the rotation axis (25) and the first center line (L1) is defined as θ2. In this case, the first angle θ1 is set to be larger than the second angle θ2.

[0080] As shown in Figure 4, the second vane chamber (53) has a second centerline (L2). The second centerline (L2) is a straight line connecting the center (O) of the axis of rotation (25) and the top dead center of the second roller (56).

[0081] As shown in Figure 6, the rear head (33) is divided into a third region on the intake side of the second centerline (L2) and a fourth region on the discharge side of the second centerline (L2), when viewed from the axial direction, which is the first direction. The second fixing part (66) is located in the third region of the rear head (33).

[0082] As shown in Figure 5, the third angle θ3 is formed by the line connecting the center (O) of the rotating shaft (25) and the center of the tip of the first discharge valve (60), and the line connecting the center (O) of the rotating shaft (25) and the center of the first fixed part (61). As shown in Figure 6, the fourth angle θ4 is formed by the line connecting the center (O) of the rotating shaft (25) and the center of the tip of the second discharge valve (65), and the line connecting the center (O) of the rotating shaft (25) and the center of the second fixed part (66). In this case, the third angle θ3 is set to a different angle from the fourth angle θ4. However, the third angle θ3 and the fourth angle θ4 may be set to the same angle.

[0083] -Effects of Embodiment 1- According to this embodiment, by arranging the first fixing part (61) in the first region of the first head (31), the wall thickness of the first head (31) can be sufficiently secured in the second region where the refrigerant pressure is high, thereby suppressing distortion of the first head (31).

[0084] According to this embodiment, by positioning the first fixing part (61) at a position further circumferentially away from the vane chamber (73) than the fastening bolt (35), the fixing position of the first fixing part (61) can be set to a position even further away from the second region where the refrigerant pressure is high.

[0085] According to this embodiment, the first fixing portion (61) can be positioned so as not to penetrate the suction passage (72) of the cylinder (70).

[0086] According to this embodiment, the fixing positions of the first fixing part (61) and the second fixing part (66) can be appropriately set for a multi-cylinder rotary compressor equipped with a first cylinder (40) and a second cylinder (50).

[0087] According to this embodiment, by arranging the first fixing part (61) in the first region of the first head (31) and the second fixing part (66) in the third region of the second head (33), sufficient wall thickness of the first head (31) and the second head (33) can be ensured in the second and fourth regions where the refrigerant pressure is high, thereby suppressing distortion of the first head (31) and the second head (33).

[0088] According to this embodiment, by making the third angle θ3 and the fourth angle θ4 different angles, the degree of design freedom regarding the arrangement of the first discharge valve (60) and the second discharge valve (65) can be increased.

[0089] According to this embodiment, by providing a radial passage (81) and an axial passage (82) in the first head (31) or the second head (33), it is not necessary to extend the intake passage (72) of the cylinder (70) radially outward, and sufficient wall thickness can be secured on the intake passage (72) side of the cylinder (70).

[0090] According to this embodiment, even when carbon dioxide, which exhibits large pressure fluctuations, is used as a refrigerant, the distortion of the first head (31) can be suppressed.

[0091] According to this embodiment, a refrigeration system equipped with a rotary compressor (10) can be provided.

[0092] <Embodiment 2> Hereinafter, the same reference numerals will be used for parts that are the same as in Embodiment 1, and only the differences will be described.

[0093] As shown in Figure 7, the second vane chamber (53) has a second centerline (L2). The second centerline (L2) is a straight line connecting the center (O) of the axis of rotation (25) and the top dead center of the second roller (56).

[0094] The rear head (33) is divided into a third region on the intake side of the second centerline (L2) and a fourth region on the discharge side of the second centerline (L2), when viewed from the axial direction, which is the first direction. The second fixing part (66) is located in the fourth region of the rear head (33).

[0095] The front head (31) has the same configuration as in Embodiment 1, so its description will be omitted.

[0096] -Effects of Embodiment 2- According to this embodiment, by arranging the first fixing part (61) in the first region of the first head (31), the wall thickness of the first head (31) can be sufficiently secured in the second region where the refrigerant pressure is high, thereby suppressing distortion of the first head (31).

[0097] Furthermore, the second fixing part (66) is positioned in the fourth region on the discharge space side of the second centerline (L2), taking into consideration the degree of design freedom.

[0098] 《Other Embodiments》 Although embodiments and modifications have been described above, it will be understood that various changes in form and details 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. In addition, the descriptions "first," "second," "third," etc. in the specification and claims are used to distinguish the phrases to which these descriptions are attached, and do not limit the number or order of such phrases.

[0099] As described above, this disclosure is useful for rotary compressors and refrigeration systems.

[0100] 1 Refrigeration unit 10 Rotary compressor 25 Rotating shaft 31 Front head (first head) 32 Middle plate 33 Rear head (second head) 35 Fastening bolts 40 First cylinder 41 First cylinder chamber 43 First vane chamber 47 First vane 49 First discharge port 50 Second cylinder 51 Second cylinder chamber 53 Second vane chamber 57 Second vane 59 Second discharge port 60 First discharge valve 61 First fixed part 65 Second discharge valve 66 Second fixed part 70 Cylinder 71 Cylinder chamber 72 Intake passage 73 Vane chamber 76 Roller 77 Vane 81 Radial passage 82 Axial passage L1 First centerline L2 Second centerline θ1 First angle θ2 Second angle θ3 Third angle θ4 Fourth angle

Claims

1. The device comprises: a rotating shaft (25) extending in a first direction; a first head (31) that pivots on the rotating shaft (25) and has a first discharge port (49) for discharging refrigerant; a cylinder (70) having a cylinder chamber (71) and positioned adjacent to the first head (31); a roller (76) fixed to the rotating shaft (25) and rotating eccentrically within the cylinder chamber (71); a vane (77) that divides the cylinder chamber (71) into an intake space and a discharge space; a second head (33) that pivots on the rotating shaft (25) and is positioned on the opposite side of the cylinder (70) from the first head (31); a first discharge valve (60) for opening and closing the first discharge port (49); and a first fixing part (61) that fixes the base end of the first discharge valve (60) to the first head (31). The cylinder (70) has a vane chamber (73) that houses the vanes (77) and has a first centerline (L1), the first head (31) is divided into a first region on the intake space side of the first centerline (L1) and a second region on the discharge space side of the first centerline (L1) when viewed from the first direction, and the first fixed part (61) is positioned in the first region of the first head (31) rotary compressor.

2. A rotary compressor according to claim 1, comprising fastening bolts (35) for fastening the first head (31), the cylinder (70), and the second head (33), wherein the first angle θ1 formed by the straight line connecting the center of the first fixed part (61) and the center (O) of the rotation shaft (25) and the first center line (L1) is greater than the second angle θ2 formed by the straight line connecting the center of the fastening bolts (35) and the center (O) of the rotation shaft (25) and the first center line (L1).

3. A rotary compressor according to claim 1 or 2, wherein the first fixed portion (61) is positioned so as to not overlap with the suction passage (72) of the cylinder (70) when viewed from the first direction.

4. A rotary compressor according to any one of claims 1 to 3, wherein the cylinder (70) includes a first cylinder (40) having a first cylinder chamber (41) and a second cylinder (50) having a second cylinder chamber (51), the vanes (77) include a first vane (47) and a second vane (57), the first cylinder (40) has a first vane chamber (43) housing the first vane (47) and having a first centerline (L1), the second cylinder (50) has a second vane chamber (53) housing the second vane (57) and having a second centerline (L2), the second head (33) has a second discharge port (59) for discharging refrigerant, and a middle plate (32) is disposed between the first cylinder (40) and the second cylinder (50), A rotary compressor comprising: a second discharge valve (65) for opening and closing the second discharge port (59); and a second fixing part (66) for fixing the base end of the second discharge valve (65) to the second head (33).

5. A rotary compressor according to claim 4, wherein the second head (33) is divided into a third region on the suction space side of the second center line (L2) and a fourth region on the discharge space side of the second center line (L2), as viewed from the first direction, the first fixed part (61) is located in the first region of the first head (31), and the second fixed part (66) is located in the fourth region of the second head (33).

6. A rotary compressor according to claim 4, wherein the second head (33) is divided into a third region on the suction space side of the second centerline (L2) and a fourth region on the discharge space side of the second centerline (L2), as viewed from the first direction, the first fixed part (61) is located in the first region of the first head (31), and the second fixed part (66) is located in the third region of the second head (33).

7. A rotary compressor according to claim 6, wherein the third angle θ3 formed by the straight line connecting the center (O) of the rotating shaft (25) and the center of the tip of the first discharge valve (60) and the straight line connecting the center (O) of the rotating shaft (25) and the center of the first fixed part (61) is different from the fourth angle θ4 formed by the straight line connecting the center (O) of the rotating shaft (25) and the center of the tip of the second discharge valve (65) and the straight line connecting the center (O) of the rotating shaft (25) and the center of the second fixed part (66).

8. A rotary compressor according to any one of claims 1 to 7, wherein the first head (31) or the second head (33) has a radial passage (81) extending radially and an axial passage (82) communicating with the radial passage (81) and extending axially, and the suction passage (72) of the cylinder (70) is communicating with the axial passage (82).

9. A rotary compressor according to any one of claims 1 to 8, wherein the refrigerant is carbon dioxide.

10. A refrigeration system comprising a rotary compressor (10) according to any one of claims 1 to 9.

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