Rotary compressor, refrigerating device, and manufacturing method for rotary compressor

Abstract

To restrain a positional shift in a radial direction of a cylinder while restraining deformation of each member constituting a compression mechanism.SOLUTION: A compression mechanism (50) comprises a first head (51), a cylinder (40), and a second head (52). A fastening bolt (65) fastens the first head (51), the cylinder (40), and the second head (52) stacked in a thickness direction. A regulating pin (60) restricts mutual relative movements of the first head (51), the cylinder (40), and the second head (52) in the radial direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a rotary compressor including a compression mechanism in which a second muffler, a second cylinder head, a second cylinder, a middle plate, a first cylinder, and the first cylinder head are fastened together with fastening bolts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-125382 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the refrigerant pressure becomes high, radial force is applied to the cylinder, which may cause the cylinder to become misaligned in the radial direction. Therefore, it is possible to suppress radial displacement of the cylinder by increasing the fastening force of the fastening bolts and increasing the frictional force between the components that make up the compression mechanism.

[0005] However, increasing the fastening force of the fastening bolts may cause deformation of the components that make up the compression mechanism.

[0006] An object of the present disclosure is to suppress radial positional deviation of the cylinder while suppressing deformation of each member constituting the compression mechanism. [Means for solving the problem]

[0007] A first aspect of the present disclosure is a rotary compressor including a compression mechanism (50) in which a first head (51), a cylinder (40), and a second head (52) are stacked in the thickness direction, and the rotary compressor is provided with fastening bolts (65) that fasten the first head (51), the cylinder (40), and the second head (52) together, and a regulating pin (60) that regulates the first head (51), the cylinder (40), and the second head (52) from moving radially relative to each other.

[0008] In the first aspect, even when the fastening force of the fastening bolts (65) is reduced to suppress deformation of the components constituting the compression mechanism (50), the radial positional deviation of the first head (51), the cylinder (40), and the second head (52) can be suppressed by the regulating pin (60).

[0009] A second aspect of the present disclosure is a rotary compressor according to the first aspect, wherein the regulating pin (60) includes a first regulating pin (61) that is pressed in from the first head (51) side and fixes the first head (51) and the cylinder (40), and a second regulating pin (62) that is pressed in from the second head (52) side and fixes the second head (52) and the cylinder (40).

[0010] In the second aspect, the tip of the first regulating pin (61) pressed in from the first head (51) side and the tip of the second regulating pin (62) pressed in from the second head (52) side are pressed in until they reach the same cylinder (40), thereby more reliably suppressing radial positional deviation of the first head (51), the cylinder (40), and the second head (52).

[0011] A third aspect of the present disclosure is a rotary compressor in which, in the rotary compressor of the first aspect, the cylinder (40) includes a first cylinder (41) and a second cylinder (42), and is provided with a middle plate (45) stacked between the first cylinder (41) and the second cylinder (42), and the regulating pin (60) regulates the first head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the second head (52) from moving radially relative to one another.

[0012] In the third aspect, even when the fastening force of the fastening bolts (65) is reduced to suppress deformation of the components constituting the compression mechanism (50), the radial positional deviation of the first head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the second head (52) can be suppressed by the regulating pin (60).

[0013] A fourth aspect of the present disclosure is a rotary compressor according to the third aspect, wherein the regulating pin (60) is a first regulating pin (61) that is pressed in from the first head (51) side and fixes the first head (51) and the first cylinder (41), and a second regulating pin (62) that is pressed in from the second head (52) side and fixes the second head (52), the second cylinder (42), the middle plate (45), and the first cylinder (41).

[0014] In the fourth aspect, the tip of the first regulating pin (61) pressed in from the first head (51) side and the tip of the second regulating pin (62) pressed in from the second head (52) side are pressed in until they reach the same first cylinder (41), thereby more reliably suppressing radial positional deviation of the first head (51), first cylinder (41), middle plate (45), second cylinder (42), and second head (52).

[0015] The fifth aspect of the present disclosure is in the rotary compressor according to the third aspect, wherein the regulating pin (60) is press-fitted from the side of the first head (51), and the first regulating pin (61) that fixes the first head (51), the first cylinder (41), and the middle plate (45), and a second regulating pin (62) that is press-fitted from the side of the second head (52) and fixes the second head (52), the second cylinder (42), and the middle plate (45).

[0016] In the fifth aspect, by press-fitting the tip of the first regulating pin (61) press-fitted from the side of the first head (51) and the tip of the second regulating pin (62) press-fitted from the side of the second head (52) until they reach the same middle plate (45), it is possible to more reliably suppress the radial displacement of the first head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the second head (52).

[0017] The sixth aspect of the present disclosure is in the rotary compressor according to any one of the first to fifth aspects, among the members constituting the compression mechanism (50), the thickness t of the member into which the tip of the regulating pin (60) is press-fitted, and the length H of the tip of the regulating pin (60) press-fitted into the member satisfy the condition 0 < H < t.

[0018] In the sixth aspect, by setting the length of the tip of the regulating pin (60) to satisfy the above-described condition, it is possible to prevent the regulating pin (60) from protruding from the member into which the tip of the regulating pin (60) is press-fitted.

[0019] The seventh aspect of the present disclosure is in the rotary compressor according to any one of the first to sixth aspects, wherein the regulating pin (60) is a tapered pin.

[0020] In the seventh aspect, the restriction pin (60) is configured as a tapered pin, which makes it easier to press-fit the restriction pin (60) into the components constituting the compression mechanism (50). Furthermore, even if the compression mechanism (50) needs to be disassembled again after it has been assembled, the restriction pin (60) can be smoothly removed.

[0021] An eighth aspect of the present disclosure is a rotary compressor according to any one of the first to seventh aspects, wherein an inner diameter D1 of the cylinder (40), an outer diameter D2 of the cylinder (40), and a distance L from the center of the cylinder (40) to a press-fit position of the regulating pin (60) satisfy the condition D1 / 2+(D2 / 2-D1 / 2) / 2≦L≦D2 / 2.

[0022] In the eighth aspect, by setting the press-fit position of the regulating pin (60) to satisfy the above-mentioned conditions, it is possible to prevent the inner peripheral wall of the cylinder (40) from being distorted toward the inside of the cylinder (40) after the regulating pin (60) is press-fitted.

[0023] A ninth aspect of the present disclosure is a refrigeration system including the rotary compressor (10) of any one of the first to eighth aspects and a refrigerant circuit (1a) through which a refrigerant compressed by the rotary compressor (10) flows.

[0024] In a ninth aspect, a refrigeration system can be provided, including a rotary compressor (10) and a refrigerant circuit (1a).

[0025] A tenth aspect of the present disclosure is a method for manufacturing a rotary compressor, comprising the steps of: stacking a first head (51), a cylinder (40), and a second head (52) in the thickness direction; fastening the first head (51), the cylinder (40), and the second head (52) with fastening bolts (65) while aligning their axes; forming a through hole (68) that is continuous with the first head (51), the cylinder (40), and the second head (52); and press-fitting a regulating pin (60) into the through hole (68) to regulate the first head (51), the cylinder (40), and the second head (52) from moving radially relative to each other.

[0026] In the tenth aspect, a through hole (68) is formed that is continuous with the first head (51), the cylinder (40), and the second head (52), and a regulating pin (60) is press-fitted into the through hole (68). With the axes of the first head (51), the cylinder (40), and the second head (52) aligned, the regulating pin (60) can suppress radial positional deviation of the first head (51), the cylinder (40), and the second head (52). [Brief explanation of the drawings]

[0027] [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 cylinder and piston. [Figure 4] FIG. 4 is a side cross-sectional view showing the press-fit position of the restriction pin in the compression mechanism. [Figure 5] FIG. 5 is a plan view illustrating the press-fit position of the restriction pin in the cylinder. [Figure 6] FIG. 6 is a diagram illustrating the procedure for assembling the compression mechanism. [Figure 7] FIG. 7 is a side cross-sectional view showing the press-fit position of the restriction pin in the compression mechanism of the modified example of the first embodiment. [Figure 8] FIG. 8 is a diagram illustrating the assembly procedure of the compression mechanism. [Figure 9] FIG. 9 is a vertical cross-sectional view showing the configuration of a rotary compressor according to the second embodiment. [Figure 10] FIG. 10 is a side cross-sectional view showing the press-fit position of the restriction pin in the compression mechanism. [Figure 11] FIG. 11 is a diagram illustrating the assembly procedure of the compression mechanism. [Figure 12] FIG. 12 is a side cross-sectional view showing the press-fit position of the restriction pin in the compression mechanism of a modified example of the second embodiment. [Figure 13] FIG. 13 is a diagram illustrating the assembly procedure of the compression mechanism. [Figure 14] FIG. 14 is a side cross-sectional view showing the press-fit position of the restriction pin in the compression mechanism of the third embodiment. [Figure 15] FIG. 15 is a diagram illustrating the assembly procedure of the compression mechanism. [Figure 16] FIG. 16 is a side cross-sectional view showing the press-fit position of the restriction pin in the compression mechanism of the fourth embodiment. [Figure 17] FIG. 17 is a diagram illustrating the assembly procedure of the compression mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0028] 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) 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.

[0029] 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.

[0030] As shown in FIG. 2, the rotary compressor (10) includes a casing (11), a drive mechanism (20), and a compression mechanism (50).

[0031] The casing (11) is a vertically long, cylindrical, sealed container. A suction pipe (16) is fixed to and passes through the body of the casing (11). An accumulator (not shown) is connected to the suction pipe (16). A discharge pipe (17) is fixed to and passes through the upper part of the casing (11).

[0032] An oil reservoir (18) is provided at the bottom of the casing (11). Oil is stored in the oil reservoir (18). The oil is used to lubricate the sliding parts of the compression mechanism (50) and the drive shaft (25).

[0033] <Drive mechanism> The drive mechanism (20) is housed inside the casing (11). The drive mechanism (20) has a motor (21) and a drive shaft (25). The motor (21) is disposed above the compression mechanism (50). The motor (21) has a stator (22) and a rotor (23).

[0034] The stator (22) is fixed to the inner peripheral surface of the casing (11). The rotor (23) passes through the interior of the stator (22) in the vertical direction. A drive shaft (25) is fixed to the interior of the axial center of the rotor (23). When the motor (21) is energized, the drive shaft (25) is rotated together with the rotor (23).

[0035] The drive shaft (25) is disposed on the axial center of the casing (11). An oil passage (29) is formed inside the drive shaft (25). An oil supply pump (28) is provided at the lower end of the drive shaft (25). The oil supply pump (28) delivers oil stored in the oil reservoir (18). The delivered oil is supplied to the compression mechanism (50) and the sliding parts of the drive shaft (25) through the oil passage (29) of the drive shaft (25).

[0036] The drive shaft 25 has a main shaft portion 26 and an eccentric portion 27. An upper portion of the main shaft portion 26 is fixed to the rotor 23 of the motor 21. The axis of the eccentric portion 27 is eccentric from the axis of the main shaft portion 26 by a predetermined amount.

[0037] The main shaft portion 26 above the eccentric portion 27 is rotatably supported by a front head 51 (described later), and the main shaft portion 26 below the eccentric portion 27 is rotatably supported by a rear head 52 (described later).

[0038] <Compression mechanism> The compression mechanism (50) is housed inside the casing (11). The compression mechanism (50) is disposed below the motor (21). The compression mechanism (50) includes a cylinder (40), a front head (51) as a first head, a rear head (52) as a second head, and a piston (54).

[0039] The cylinder (40) is formed of a flat, substantially annular member. A circular compression chamber (55) is formed in the center of the cylinder (40). A suction passage (56) extending radially is formed in the cylinder (40). The downstream end of the suction passage (56) communicates with the compression chamber (55). The upstream end of the suction passage (56) is connected to the suction pipe (16).

[0040] The front head (51) is disposed above the cylinder (40). The front head (51) is disposed so as to cover the interior space of the cylinder (40) from above. The front head (51) rotatably supports the main shaft portion (26) of the drive shaft (25). A discharge passage (59) is formed in the front head (51) and passes through it in the axial direction (see FIG. 3).

[0041] The rear head (52) is disposed below the cylinder (40). The rear head (52) is disposed so as to cover the interior space of the cylinder (40) from below. The rear head (52) rotatably supports the main shaft portion (26) of the drive shaft (25).

[0042] As shown in Figure 3, the piston (54) is housed inside the cylinder (40). The blade (57) is integrally formed with the piston (54). The cylinder (40) and the piston (54) define a compression chamber (55). The piston (54) is formed in a perfect circular ring shape. The eccentric portion (27) of the drive shaft (25) is fitted inside the piston (54).

[0043] Although the rotary compressor (10) of this embodiment has been described as having a configuration in which the blades (57) are integrally formed with the piston (54), the present invention is not limited to this configuration. For example, the rotary compressor may have the blades (57) and the piston (54) formed as separate bodies.

[0044] The interior of the compression chamber (55) is divided into a low-pressure chamber (55a) and a high-pressure chamber (55b) by the blade (57) (see FIG. 3). The blade (57) is supported by a pair of bushes (58) so as to be able to swing.

[0045] The piston (54) rotates eccentrically in the cylinder (40) as the drive shaft (25) is rotated. As the volume of the low-pressure chamber (55a) increases gradually with the eccentric rotation of the piston (54), the refrigerant flowing through the suction pipe (16) is drawn into the low-pressure chamber (55a) from the suction passage (56).

[0046] Next, when the low-pressure chamber (55a) is isolated from the suction passage (56), the isolated space forms the high-pressure chamber (55b). As the volume of the high-pressure chamber (55b) gradually decreases, the internal pressure of the high-pressure chamber (55b) increases. When the internal pressure of the high-pressure chamber (55b) exceeds a predetermined pressure, the refrigerant in the high-pressure chamber (55b) flows out of the compression mechanism (50) through the discharge passage (59). 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 flowing out above the motor (21) is sent to the refrigerant circuit (1a) through the discharge pipe (17).

[0047] <Regarding fastening bolts and restriction pins> As shown in Fig. 4, the front head (51), the cylinder (40), and the rear head (52) are fastened together by fastening bolts (65). Note that in Fig. 4, the internal space of the cylinder (40) is not shown in order to make it easier to see the fastening positions of the fastening bolts (65).

[0048] 4, the front head (51), the cylinder (40), and the rear head (52) are fastened together by fastening bolts (65) inserted from the rear head (52) side. Also, the front head (51) and the cylinder (40) are fastened together by fastening bolts (65) inserted from the front head (51) side.

[0049] However, when the refrigerant pressure becomes high, a radial force is applied to the cylinder (40), which may cause radial displacement of the cylinder (40). Therefore, in this embodiment, the restriction pin (60) is press-fitted in addition to the fastening bolt (65) to prevent radial displacement of the cylinder (40).

[0050] Specifically, the front head (51), the cylinder (40), and the rear head (52) are restricted by a restricting pin (60) so as to prevent relative radial movement between them. The restricting pin (60) is a tapered pin. However, the restricting pin (60) may also be a straight pin.

[0051] The regulating pin (60) includes a first regulating pin (61) and a second regulating pin (62). The first regulating pin (61) is press-fitted into the tapered hole (70) from the front head (51) side to fix the front head (51) and the cylinder (40). The second regulating pin (62) is press-fitted into the tapered hole (70) from the rear head (52) side to fix the rear head (52) and the cylinder (40). Thus, the tip of the first regulating pin (61) and the tip of the second regulating pin (62) are press-fitted until they reach the same cylinder (40).

[0052] In the example shown in FIG. 4, among the members constituting the compression mechanism (50), the member into which the tip of the regulating pin (60) is press-fitted is the cylinder (40). Here, the thickness t of the cylinder (40) and the length H of the tip of the regulating pin (60) press-fitted into the cylinder (40) are set to satisfy the condition 0 < H < t. Note that the length H of the tip of the press-fitted regulating pin (60) may be 0.5 mm or more.

[0053] Thus, by setting the length of the tip of the regulating pin (60) to satisfy the above-described condition, the regulating pin (60) can be prevented from protruding from the member into which the tip of the regulating pin (60) is press-fitted.

[0054] In the example shown in FIG. 5, three regulating pins (60) are provided at intervals in the circumferential direction of the cylinder (40). The three regulating pins (60) are arranged, for example, at intervals of 120° in the circumferential direction of the cylinder (40) in a plan view. Here, two of the three regulating pins (as the first regulating pin (61) or the second regulating pin (62)), and the remaining one as the second regulating pin (62) or the first regulating pin (61).

[0055] When there are two regulating pins (60), the first regulating pin (61) and the second regulating pin (62) may be arranged, for example, at intervals of 180° in the circumferential direction of the cylinder (40).

[0056] A threaded hole (66) is formed between the restriction pins (60) of the cylinder (40). A fastening bolt (65) is fastened into the threaded hole (66).

[0057] Here, the inner diameter D1 of the cylinder (40), the outer diameter D2 of the cylinder (40), and the distance L from the center (O) of the cylinder (40) to the press-fit position of the regulating pin (60) are set to satisfy the condition D1 / 2+(D2 / 2-D1 / 2) / 2≦L≦D2 / 2.

[0058] In this way, by setting the press-fit position of the regulating pin (60) so as to satisfy the above-mentioned conditions, it is possible to prevent the inner peripheral wall of the cylinder (40) from being distorted toward the inside of the cylinder (40) after the regulating pin (60) is press-fitted.

[0059] <Compression mechanism assembly procedure> The procedure for assembling the compression mechanism (50) will be described below with reference to Fig. 6. As shown in Fig. 6 [1], the front head (51) is stacked on the cylinder (40). The front head (51) and the cylinder (40) are fastened together with fastening bolts (65) inserted from the front head (51) side. At this time, a centering operation is performed so that the front head (51) and the cylinder (40) are coaxial.

[0060] The front head (51) and the cylinder (40) each have a pilot hole (67). In this case, the pilot holes (67) of the front head (51) and the cylinder (40) do not need to be coaxial with each other.

[0061] 6 [2], with the front head (51) and the cylinder (40) fastened together with the fastening bolts (65), the inner diameter of the pilot hole (67) is increased with a reamer (80) to form a through hole (68). The through hole (68) passes coaxially through the front head (51) and the cylinder (40).

[0062] As shown in [3] of Figure 6, a tapered reamer (81) is inserted from the front head (51) side toward the through-hole (68). The tapered reamer (81) forms a tapered hole (70) that is continuous with the front head (51) and the cylinder (40). Impurities such as chips generated when forming the tapered hole (70) are removed through the through-hole (68).

[0063] As shown in [4] of FIG. 6, the first regulating pin (61) formed of a tapered pin is press-fitted into the tapered hole (70).

[0064] As shown in [5] of Figure 6, the rear head (52) is stacked on the cylinder (40). The front head (51), cylinder (40), and rear head (52) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, centering is performed so that the front head (51), cylinder (40), and rear head (52) are coaxial.

[0065] A pilot hole 67 is formed in each of the front head 51, the cylinder 40, and the rear head 52. In this case, the pilot holes 67 of the front head 51, the cylinder 40, and the rear head 52 do not have to be coaxial.

[0066] 6, with the front head (51), the cylinder (40), and the rear head (52) fastened together with the fastening bolts (65), the inner diameter of the pilot hole (67) is increased with a reamer (80), thereby forming a through hole (68). The through hole (68) coaxially passes through the front head (51), the cylinder (40), and the rear head (52).

[0067] As shown in [7] of Figure 6, a tapered reamer (81) is inserted from the rear head (52) side toward the through-hole (68). The tapered reamer (81) forms a tapered hole (70) that is continuous with the rear head (52) and the cylinder (40).

[0068] As shown in FIG. 4, a second regulating pin (62) composed of a tapered pin is press-fitted into a tapered hole (70).

[0069] -Effect of Embodiment 1- According to the features of this embodiment, even when the fastening force of the fastening bolt (65) is reduced to suppress deformation of each member constituting the compression mechanism (50), the radial displacement of the first head (51), the cylinder (40), and the second head (52) can be suppressed by the regulating pin (60).

[0070] According to the features of this embodiment, by press-fitting the tip of the first regulating pin (61) press-fitted from the first head (51) side and the tip of the second regulating pin (62) press-fitted from the second head (52) side until they reach the same cylinder (40), the radial displacement of the first head (51), the cylinder (40), and the second head (52) can be more reliably suppressed.

[0071] According to the features of this embodiment, among the members constituting the compression mechanism (50), by setting the thickness t of the member into which the tip of the regulating pin (60) is press-fitted and the length H of the tip of the regulating pin (60) press-fitted into the member to satisfy the condition 0 < H < t, the regulating pin (60) can be prevented from protruding from the member into which the tip of the regulating pin (60) is press-fitted.

[0072] According to the features of this embodiment, by forming the regulating pin (60) as a tapered pin, it becomes easier to press-fit the regulating pin (60) into each member constituting the compression mechanism (50). Also, even when it is necessary to disassemble the compression mechanism (50) again after assembly, the regulating pin (60) can be removed smoothly.

[0073] According to the features of the present embodiment, by setting the inner diameter D1 of the cylinder (40), the outer diameter D2 of the cylinder (40), and the distance L from the center of the cylinder (40) to the press-fitting position of the regulating pin (60) so as to satisfy the condition of D1 / 2 + (D2 / 2 - D1 / 2) / 2 ≦ L ≦ D2 / 2, after the regulating pin (60) is press-fitted, it is possible to suppress the inner peripheral wall of the cylinder (40) from being distorted toward the inside of the cylinder (40).

[0074] According to the features of the present embodiment, it is possible to provide a refrigeration device including a rotary compressor (10) and a refrigerant circuit (1a).

[0075] According to the features of the present embodiment, a through hole (68) that is continuous with the first head (51), the cylinder (40), and the second head (52) is formed, and by press-fitting a regulating pin (60) into the through hole (68), in a state where the axial centers of the first head (51), the cylinder (40), and the second head (52) are aligned, the radial displacement of the first head (51), the cylinder (40), and the second head (52) can be suppressed by the regulating pin (60).

[0076] <Modification Example of Embodiment 1> As shown in FIG. 7, the front head (51), the cylinder (40), and the rear head (52) are regulated by the regulating pin (60) so as not to move relative to each other in the radial direction. The regulating pin (60) is press-fitted into the tapered hole (70) from the front head (51) side to fix the front head (51), the cylinder (40), and the rear head (52). Thus, the tip of the regulating pin (60) is press-fitted until it reaches the rear head (52).

[0077] In the example shown in FIG. 7, among the members constituting the compression mechanism (50), the member into which the tip of the regulating pin (60) is press-fitted is the rear head (52). Here, the thickness t of the rear head (cont'd)

[0078] The procedure for assembling the compression mechanism (50) will be described below with reference to Fig. 8. As shown in Fig. 8 [1], the front head (51) is stacked on the cylinder (40). The front head (51) and the cylinder (40) are fastened together with fastening bolts (65) inserted from the front head (51) side. At this time, centering is performed so that the front head (51) and the cylinder (40) are coaxial.

[0079] As shown in [2] of Figure 8, the rear head (52) is stacked on the cylinder (40). The front head (51), cylinder (40), and rear head (52) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, centering is performed so that the front head (51), cylinder (40), and rear head (52) are coaxial.

[0080] 8 [3], with the front head (51), the cylinder (40), and the rear head (52) fastened together with the fastening bolts (65), the inner diameter of the pilot hole (67) is increased with a reamer (80) to form a through hole (68). The through hole (68) coaxially passes through the front head (51), the cylinder (40), and the rear head (52).

[0081] As shown in [4] of Figure 8, a tapered reamer (81) is inserted from the front head (51) side toward the through-hole (68). The tapered reamer (81) forms a tapered hole (70) that is continuous with the front head (51), the cylinder (40), and the rear head (52).

[0082] As shown in FIG. 7, the restriction pin (60) formed of a tapered pin is press-fitted into the tapered hole (70).

[0083] In the example shown in FIG. 7, the configuration has been described in which the regulating pin (60) is inserted from the front head (51) side and the tip of the regulating pin (60) is press-fit into the rear head (52), but the present invention is not limited to this configuration.

[0084] For example, a tapered hole (70) may be formed by inserting a tapered reamer (81) from the rear head (52) side toward the through hole (68), and the restricting pin (60) may be inserted from the rear head (52) side, so that the tip of the restricting pin (60) is pressed into the front head (51).

[0085] 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.

[0086] As shown in FIG. 9, the rotary compressor (10) includes a casing (11), a drive mechanism (20), and a compression mechanism (50).

[0087] The drive mechanism 20 includes a motor 21 and a drive shaft 25. The drive shaft 25 includes a main shaft 26 and two eccentric portions 27. The axis of the eccentric portion 27 is eccentric from the axis of the main shaft 26 by a predetermined amount. The two eccentric portions 27 are eccentric in directions that are 180° apart from each other.

[0088] The compression mechanism (50) includes two cylinders (40), a front head (51), a rear head (52), two pistons (54), and a middle plate (45). The middle plate (45) is sandwiched between the two cylinders (40).

[0089] The cylinder (40) includes a first cylinder (41) and a second cylinder (42). Note that the first cylinder (41) and the second cylinder (42) have the same configuration as the cylinder (40) described in the first embodiment, and therefore detailed description thereof will be omitted.

[0090] As shown in Figure 10, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened together by fastening bolts (65). Note that in Figure 10, the internal space of the cylinder (40) is not shown in order to make it easier to see the fastening positions of the fastening bolts (65).

[0091] In the example shown in FIG. 10, the front head (51) and the first cylinder (41) are fastened by a fastening bolt (65) inserted from the front head (51) side. The rear head (52) and the second cylinder (42) are fastened by a fastening bolt (65) inserted from the rear head (52) side. Further, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened by a fastening bolt (65) inserted from the rear head (52) side.

[0092] The front head (51) and the first cylinder (41) are restricted by a first restricting pin (61) so as not to move relative to each other in the radial direction. The first restricting pin (61) is press-fitted into a tapered hole (70) from the front head (51) side to fix the front head (51) and the first cylinder (41). Thus, the tip of the first restricting pin (61) is press-fitted until it reaches the first cylinder (41).

[0093] In the example shown in FIG. 10, among the members constituting the compression mechanism (50), the member into which the tip of the first restricting pin (61) is press-fitted is the first cylinder (41). Here, the thickness t of the first cylinder (41) and the length H of the tip of the first restricting pin (61) press-fitted into the first cylinder (41) are set so as to satisfy the condition 0 < H < t.

[0094] The rear head (52) and the second cylinder (42) are restricted by a second restricting pin (62) so as not to move relative to each other in the radial direction. The second restricting pin (62) is press-fitted into a tapered hole (70) from the rear head (52) side to fix the rear head (52) and the second cylinder (42). Thus, the tip of the second restricting pin (62) is press-fitted until it reaches the second cylinder (42).

[0095] In the example shown in FIG. 10, among the members constituting the compression mechanism (50), the member into which the tip of the second regulating pin (62) is press-fitted is the second cylinder (42). Here, the thickness t of the second cylinder (42) and the length H of the tip of the second regulating pin (62) press-fitted into the second cylinder (42) are set so as to satisfy the condition 0 < H < t.

[0096] <Assembly Procedure of Compression Mechanism> Hereinafter, the assembly procedure of the compression mechanism (50) will be described with reference to FIG. 11. As shown in [1] of FIG. 11, the front head (51) is laminated on the first cylinder (41). The front head (51) and the first cylinder (41) are fastened by a fastening bolt (65) inserted from the front head (51) side. At this time, centering work is performed so that the front head (51) and the first cylinder (41) are coaxial.

[0097] Lower holes (67) are formed in the front head (51) and the first cylinder (41), respectively. At this time, the lower holes (67) of the front head (51) and the first cylinder (41) do not have to be coaxial.

[0098] As shown in [2] of FIG. 11, with the front head (51) and the first cylinder (41) fastened by the fastening bolt (65), a through hole (68) is formed by enlarging the inner diameter of the lower hole (67) with a reamer (80). The through hole (68) penetrates the front head (51) and the cylinder (not specified in the original text, assuming it should be (40) as in the context) coaxially.

[0099] As shown in [3] of FIG. 11, a taper reamer (81) is inserted from the front head (51) side toward the through hole (68). The taper reamer (81) forms a tapered hole (70) so as to be continuous with the front head (51) and the cylinder (40).

[0100] As shown in [4] of FIG. 11, the first regulating pin (61) composed of a taper pin is press-fitted into the tapered hole (70).

[0101] As shown in [5] of Figure 11, the rear head (52) is stacked on the second cylinder (42). The rear head (52) and the second cylinder (42) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, centering is performed so that the rear head (52) and the second cylinder (42) are coaxial.

[0102] The rear head (52) and the second cylinder (42) each have a pilot hole (67). In this case, the pilot holes (67) of the rear head (52) and the second cylinder (42) do not have to be coaxial.

[0103] 11 [6], with the rear head (52) and the second cylinder (42) fastened together with the fastening bolts (65), the inner diameter of the pilot hole (67) is increased with a reamer (80) to form a through hole (68). The through hole (68) coaxially passes through the rear head (52) and the second cylinder (42).

[0104] As shown in [7] of Figure 11, a tapered reamer (81) is inserted from the rear head (52) side toward the through-hole (68). The tapered reamer (81) forms a tapered hole (70) that is continuous with the rear head (52) and the second cylinder (42).

[0105] As shown in [8] of FIG. 11, the second regulating pin (62) formed of a tapered pin is press-fitted into the tapered hole (70).

[0106] As shown in Figure 10, the middle plate (45) is disposed between the first cylinder (41) and the second cylinder (42). The front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, a centering operation is performed so that the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are coaxial.

[0107] -Effects of Embodiment 2- According to the features of this embodiment, in order to suppress deformation of each member constituting the compression mechanism (50), even when the fastening force of the fastening bolt (65) is reduced, the radial displacement of the first head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the second head (52) can be suppressed by the regulating pin (60).

[0108] <Modification Example of Embodiment 2> As shown in FIG. 12, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are regulated by the regulating pin (60) so as not to move relative to each other in the radial direction. The regulating pin (60) is press-fitted into the tapered hole (70) from the front head (51) side to fix the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52). Thus, the tip of the regulating pin (60) is press-fitted until it reaches the rear head (52).

[0109] In the example shown in FIG. 12, among the members constituting the compression mechanism (50), the member into which the tip of the regulating pin (60) is press-fitted is the rear head (52). Here, the thickness t of the rear head (52) and the length H of the tip of the regulating pin (60) press-fitted into the rear head (52) are set so as to satisfy the condition 0 < H < t.

[0110] Hereinafter, the assembly procedure of the compression mechanism (50) will be described with reference to FIG. 13. As shown in [1] of FIG. 13, the front head (51) is laminated on the first cylinder (41). The front head (51) and the first cylinder (41) are fastened by a fastening bolt (an) inserted from the front head (51) side. At this time, centering work is performed so that the front head (51) and the first cylinder (41) are coaxial.

[0111] As shown in [2] of Figure 13, the rear head (52) is stacked on the second cylinder (42). The rear head (52) and the second cylinder (42) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, centering is performed so that the rear head (52) and the second cylinder (42) are coaxial.

[0112] As shown in [3] of Figure 13, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are stacked. The front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened together with fastening bolts (65) inserted from the rear head (52) side. A pilot hole (67) is formed in each of the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52).

[0113] 13 [4], with the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) fastened together with the fastening bolts (65), the inner diameter of the pilot hole (67) is increased with a reamer (80) to form a through hole (68). The through hole (68) coaxially passes through the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52).

[0114] As shown in [5] of Figure 13, a tapered reamer (81) is inserted from the front head (51) side toward the through-hole (68). The tapered reamer (81) forms a tapered hole (70) that is continuous with the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52).

[0115] As shown in FIG. 12, the restriction pin (60) formed of a tapered pin is press-fitted into the tapered hole (70).

[0116] In the example shown in Figure 12, a configuration has been described in which the regulating pin (60) is inserted from the front head (51) side and the tip of the regulating pin (60) is press-fit into the rear head (52), but the present invention is not limited to this configuration.

[0117] For example, a tapered hole (70) may be formed by inserting a tapered reamer (81) from the rear head (52) side toward the through hole (68), and the restricting pin (60) may be inserted from the rear head (52) side, so that the tip of the restricting pin (60) is pressed into the front head (51).

[0118] Third Embodiment As shown in FIG. 14, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened together by fastening bolts (65).

[0119] 14, the front head (51) and the first cylinder (41) are fastened together by fastening bolts (65) inserted from the front head (51) side. The rear head (52) and the second cylinder (42) are fastened together by fastening bolts (65) inserted from the rear head (52) side. Furthermore, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened together by fastening bolts (65) inserted from the rear head (52) side.

[0120] The front head (51) and the first cylinder (41) are restricted by a first restricting pin (61) so as not to move relative to each other in the radial direction. The first restricting pin (61) is press-fitted into the tapered hole (70) from the front head (51) side to fix the front head (51) and the first cylinder (41). In this manner, the tip of the first restricting pin (61) is press-fitted until it reaches the first cylinder (41).

[0121] The rear head (52) and the second cylinder (42) are restricted by the second regulating pin (62) so as not to move relative to each other in the radial direction. The second regulating pin (62) is press-fitted into the tapered hole (70) from the rear head (52) side, and fixes the rear head (52), the second cylinder (42), the middle plate (45), and the first cylinder (41). Thus, the tip of the second regulating pin (62) is press-fitted until it reaches the first cylinder (41).

[0122] In the example shown in FIG. 14, among the members constituting the compression mechanism (50), the member into which the tips of the first regulating pin (61) and the second regulating pin (62) are press-fitted is the first cylinder (41). Here, the thickness t of the first cylinder (41) and the length H of the tip of the regulating pin (60) press-fitted into the first cylinder (41) are set so as to satisfy the condition 0 < H < t.

[0123] 〈Assembly procedure of the compression mechanism〉 Hereinafter, the assembly procedure of the compression mechanism (50) will be described with reference to FIG. 15. As shown in [1] of FIG. 15, the front head (51) is stacked on the first cylinder (41). The front head (51) and the first cylinder (41) are fastened by a fastening bolt (65) inserted from the front head (51) side. At this time, centering work is performed so that the front head (51) and the first cylinder (41) are coaxial.

[0124] As shown in [2] of FIG. 15, with the front head (51) and the first cylinder (41) fastened by the fastening bolt (65), a through hole (68) is formed by enlarging the inner diameter of the lower hole (67) with a reamer (80). The through hole (68) penetrates the front head (51) and the first cylinder (41) coaxially.

[0125] As shown in [3] of FIG. 15, a tapered reamer (81) is inserted from the front head (51) side toward the through hole (68). The tapered reamer (81) forms a tapered hole (70) so as to be continuous with the front head (51) and the first cylinder (41).

[0126] As shown in [4] of FIG. 15, the first regulating pin (61) formed of a tapered pin is press-fitted into the tapered hole (70).

[0127] As shown in [5] of Figure 15, the rear head (52) is stacked on the second cylinder (42). The rear head (52) and the second cylinder (42) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, centering is performed so that the rear head (52) and the second cylinder (42) are coaxial.

[0128] As shown in [6] in Figure 15, the middle plate (45) is placed between the first cylinder (41) and the second cylinder (42). The front head (51), first cylinder (41), middle plate (45), second cylinder (42), and rear head (52) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, a centering operation is performed so that the front head (51), first cylinder (41), middle plate (45), second cylinder (42), and rear head (52) are coaxial.

[0129] 15 [7], with the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) fastened together with the fastening bolts (65), the inner diameter of the pilot hole (67) is increased with a reamer (80) to form a through hole (68). The through hole (68) coaxially passes through the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52).

[0130] As shown in [8] in Figure 15, a tapered reamer (81) is inserted from the rear head (52) side toward the through-hole (68). The tapered reamer (81) forms a tapered hole (70) that is continuous with the rear head (52), the second cylinder (42), the middle plate (45), and the first cylinder (41).

[0131] As shown in FIG. 14, the second restriction pin (62) formed of a tapered pin is press-fitted into the tapered hole (70).

[0132] In the present embodiment, the tip end portion of the first regulating pin (61) and the tip end portion of the second regulating pin (62) are press-fitted until they reach the first cylinder (41), but this is not limiting. For example, the tip end portion of the first regulating pin (61) and the tip end portion of the second regulating pin (62) may be press-fitted until they reach the second cylinder (42).

[0133] -Effects of the third embodiment- According to the features of this embodiment, the tip of the first regulating pin (61) pressed in from the first head (51) side and the tip of the second regulating pin (62) pressed in from the second head (52) side are pressed in until they reach the same first cylinder (41), thereby more reliably suppressing radial positional deviation of the first head (51), first cylinder (41), middle plate (45), second cylinder (42), and second head (52).

[0134] Fourth Embodiment As shown in FIG. 16, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened together by fastening bolts (65).

[0135] 16, the front head (51) and the first cylinder (41) are fastened together by fastening bolts (65) inserted from the front head (51) side. The rear head (52) and the second cylinder (42) are fastened together by fastening bolts (65) inserted from the rear head (52) side. Furthermore, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened together by fastening bolts (65) inserted from the rear head (52) side.

[0136] The front head (51), the first cylinder (41), and the middle plate (45) are regulated by the first regulating pin (61) so as not to relatively move in the radial direction with respect to each other. The first regulating pin (61) is press-fitted into the tapered hole (70) from the front head (51) side to fix the front head (51), the first cylinder (41), and the middle plate (45). Thus, the tip of the first regulating pin (61) is press-fitted until it reaches the middle plate (45).

[0137] The rear head (52), the second cylinder (42), and the middle plate (45) are regulated by the second regulating pin (62) so as not to relatively move in the radial direction with respect to each other. The second regulating pin (62) is press-fitted into the tapered hole (70) from the rear head (52) side to fix the rear head (52), the second cylinder (42), and the middle plate (45). Thus, the tip of the second regulating pin (62) is press-fitted until it reaches the middle plate (45).

[0138] In the example shown in FIG. 16, among the members constituting the compression mechanism (50), the member into which the tips of the first regulating pin (61) and the second regulating pin (62) are press-fitted is the middle plate (45). Here, the thickness t of the middle plate (45) and the length H of the tip of the regulating pin (60) press-fitted into the middle plate (45) are set so as to satisfy the condition of 0 < H < t.

[0139] <Assembly Procedure of Compression Mechanism> Hereinafter, the assembly procedure of the compression mechanism (50) will be described with reference to FIG. 17. As shown in [1] of FIG. 17, the front head (51) is laminated on the first cylinder (41). The front head (51) and the first cylinder (41) are fastened by a fastening bolt (65) inserted from the front head (51) side. At this time, centering work is performed so that the front head (51) and the first cylinder (41) are coaxial.

[0140] As shown in [2] of Figure 17, the rear head (52) is stacked on the second cylinder (42). The rear head (52) and the second cylinder (42) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, centering is performed so that the rear head (52) and the second cylinder (42) are coaxial.

[0141] As shown in [3] of Figure 17, the front head (51) and the first cylinder (41) are stacked on the middle plate (45). A pilot hole (67) is formed in each of the front head (51), the first cylinder (41), and the middle plate (45). The inner diameter of the pilot hole (67) is increased with a reamer (80), thereby forming a through hole (68). The through hole (68) coaxially passes through the front head (51), the first cylinder (41), and the middle plate (45).

[0142] As shown in [4] of Figure 17, a tapered reamer (81) is inserted from the front head (51) side toward the through-hole (68). The tapered reamer (81) forms a tapered hole (70) that is continuous with the front head (51), the first cylinder (41), and the middle plate (45).

[0143] As shown in [5] of FIG. 17, the first regulating pin (61) formed of a tapered pin is press-fitted into the tapered hole (70).

[0144] As shown in [6] of Figure 17, the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are stacked. The front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are fastened together with fastening bolts (65) inserted from the rear head (52) side. At this time, a centering operation is performed so that the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) are coaxial.

[0145] 17, with the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52) fastened together with the fastening bolts (65), the inner diameter of the pilot hole (67) is increased with a reamer (80) to form a through hole (68). The through hole (68) coaxially passes through the front head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the rear head (52).

[0146] As shown in [8] of Figure 17, a tapered reamer (81) is inserted from the rear head (52) side toward the through-hole (68). The tapered reamer (81) forms a tapered hole (70) that is continuous with the rear head (52), the second cylinder (42), and the middle plate (45).

[0147] As shown in FIG. 16, the second regulating pin (62) formed of a tapered pin is press-fitted into the tapered hole (70).

[0148] -Effects of the fourth embodiment- According to the features of this embodiment, the tip of the first regulating pin (61) pressed in from the first head (51) side and the tip of the second regulating pin (62) pressed in from the second head (52) side are pressed in until they reach the same middle plate (45), thereby more reliably suppressing radial positional deviation of the first head (51), first cylinder (41), middle plate (45), second cylinder (42), and second head (52).

[0149] 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]

[0150] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for a rotary compressor, a refrigeration device, and a method for manufacturing a rotary compressor. [Explanation of symbols]

[0151] 1 Refrigeration equipment 1a Refrigerant circuit 10 Rotary Compressor 40 cylinders 41 No. 1 cylinder 42 No. 2 cylinder 45 Middle Plate 50 Compression mechanism 51 Front head (first head) 52 Rear head (second head) 60 Regulatory pin 61 First control pin 62 Second regulation pin 65 Fastening bolt

Claims

1. A rotary compressor including a compression mechanism (50) in which a first head (51), a cylinder (40), and a second head (52) are stacked in a thickness direction, a fastening bolt (65) for fastening the first head (51), the cylinder (40), and the second head (52) together; and a restricting pin (60) that restricts the first head (51), the cylinder (40), and the second head (52) from moving relative to one another in the radial direction. Rotary compressor.

2. 2. The rotary compressor of claim 1, The restriction pin (60) a first regulating pin (61) press-fitted from the first head (51) side to fix the first head (51) and the cylinder (40); a second regulating pin (62) that is press-fitted from the second head (52) side and fixes the second head (52) and the cylinder (40). Rotary compressor.

3. 2. The rotary compressor of claim 1, The cylinder (40) includes a first cylinder (41) and a second cylinder (42), a middle plate (45) stacked between the first cylinder (41) and the second cylinder (42); The regulating pin (60) regulates the first head (51), the first cylinder (41), the middle plate (45), the second cylinder (42), and the second head (52) from moving relative to one another in the radial direction. Rotary compressor.

4. The rotary compressor of claim 3, The restriction pin (60) a first regulating pin (61) press-fitted from the first head (51) side to fix the first head (51) and the first cylinder (41); a second regulating pin (62) that is press-fitted from the second head (52) side and fixes the second head (52), the second cylinder (42), the middle plate (45), and the first cylinder (41). Rotary compressor.

5. The rotary compressor of claim 3, The restriction pin (60) a first regulating pin (61) that is press-fitted from the first head (51) side and fixes the first head (51), the first cylinder (41), and the middle plate (45); a second regulating pin (62) that is press-fitted from the second head (52) side and fixes the second head (52), the second cylinder (42), and the middle plate (45). Rotary compressor.

6. The rotary compressor according to any one of claims 1 to 5, Among the members constituting the compression mechanism (50), a thickness t of a member into which the tip of the regulating pin (60) is press-fitted and a length H of the tip of the regulating pin (60) press-fitted into the member satisfy the condition 0<H<t. Rotary compressor.

7. The rotary compressor according to any one of claims 1 to 5, The restriction pin (60) is a tapered pin. Rotary compressor.

8. The rotary compressor according to any one of claims 1 to 5, The inner diameter D1 of the cylinder (40), the outer diameter D2 of the cylinder (40), and the distance L from the center of the cylinder (40) to the press-fit position of the regulating pin (60) satisfy the condition: D1 / 2+(D2 / 2-D1 / 2) / 2≦L≦D2 / 2 Rotary compressor.

9. A rotary compressor (10) according to any one of claims 1 to 5; a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows. Refrigeration equipment.

10. a step of stacking the first head (51), the cylinder (40), and the second head (52) in the thickness direction; fastening the first head (51), the cylinder (40), and the second head (52) together with fastening bolts (65) while aligning their axes; forming a through hole that is continuous with the first head (51), the cylinder (40), and the second head (52); and a step of press-fitting a regulating pin (60) into the through hole to regulate the first head (51), the cylinder (40), and the second head (52) from moving relative to one another in the radial direction. A manufacturing method for a rotary compressor.

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