Rotary compressor and refrigeration system

Abstract

This disclosure provides a rotary compressor that suppresses cylinder deformation. [Solution] A rotary compressor comprising: a drive shaft that rotates about a first axis along a first direction; a cylindrical cylinder having a cylinder chamber inside and an inner circumferential surface which is a cylindrical surface having a central axis in the first direction, and an outer circumferential surface; a piston fixed to the drive shaft and rotating eccentrically in the cylinder chamber; and a bearing portion arranged adjacent to the cylinder and having a discharge port for compressed refrigerant, wherein the width of the cylinder is defined as the difference between the distance from the first axis to the outer circumferential surface and the distance from the first axis to the inner circumferential surface, and at least in the range corresponding to the discharge port, the width of the cylinder in a first range in the first direction is smaller than the width of the cylinder in a second range different from the first range in the first direction.

Description

Technical Field

[0004] , , , ,

[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 abuts against the roller while the roller eccentrically rotates, a so-called swing type in which a vane integrally formed with the roller swings along with the eccentric rotation of the roller, a so-called hinge vane type in which the tip of the vane is rotatably fitted in a recess on the outer peripheral surface of the roller while the roller eccentrically rotates, and the like.

Background Art

[0002] Patent Document 1 discloses a swing type rotary compressor in which a piston inserted into an eccentric portion of a drive shaft is revolvably installed in a cylinder chamber. Patent Document 1 discloses that in the swing type rotary compressor, a blade portion that partitions the cylinder chamber into a compression chamber and a suction chamber in which a suction hole opens is integrally protruded on the piston, and the blade portion is swingably supported by a support body rotatably disposed on the cylinder.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a rotary compressor comprising a cylindrical cylinder forming a cylinder chamber and a piston that rotates eccentrically within the cylinder chamber, the cylinder may deform as the refrigerant is compressed. For example, if the cylinder deforms so that the side away from the discharge port widens, oil may accumulate in the widened portion, and this accumulated oil may be compressed. Therefore, it is necessary to suppress the deformation of the cylinder.

[0005] This disclosure provides a rotary compressor that suppresses cylinder deformation. [Means for solving the problem]

[0006] The rotary compressor from the first perspective is, A drive shaft that rotates around a first axis along the first direction, A cylindrical cylinder having a cylinder chamber inside, an inner circumferential surface which is a cylindrical surface having a central axis in the first direction, and an outer circumferential surface, A piston fixed to the drive shaft and rotating eccentrically within the cylinder chamber, A bearing portion, which is positioned adjacent to the cylinder and has a discharge port for compressed refrigerant, Equipped with, The width of the cylinder is defined as the difference between the distance from the first axis to the outer circumferential surface and the distance from the first axis to the inner circumferential surface. At least in the range corresponding to the discharge port, the width of the cylinder in the first range in the first direction is smaller than the width of the cylinder in a second range different from the first range in the first direction.

[0007] According to the rotary compressor from the first perspective, cylinder deformation can be suppressed.

[0008] A rotary compressor in the second aspect is a rotary compressor in the first aspect in which the cylinder has a first surface facing the discharge port and a second surface opposite to the first surface, the first range is the range including the first surface and the second range is the range including the second surface.

[0009] According to the second aspect of the rotary compressor, deformation of the cylinder on the side away from the discharge port can be suppressed.

[0010] The rotary compressor in the third view is the rotary compressor described in the second view, wherein the outer surface has a step.

[0011] According to the rotary compressor from the third perspective, deformation of the cylinder on the side away from the discharge port can be suppressed.

[0012] The rotary compressor of the fourth viewpoint is the rotary compressor of the second viewpoint, wherein the outer surface has a shape that is inclined with respect to the first direction.

[0013] According to the rotary compressor from the fourth perspective, deformation of the cylinder on the side away from the discharge port can be suppressed.

[0014] The rotary compressor of the fifth perspective is a rotary compressor of any of the first to fourth perspectives, wherein the width of the cylinder in the second range on the discharge side of the cylinder is greater than the width of the cylinder in the second range on the intake side of the cylinder.

[0015] According to the rotary compressor from the fifth perspective, deformation of the cylinder on the side where the discharge port is located can be suppressed.

[0016] The rotary compressor of the sixth perspective, when the inner diameter of the cylinder is D and the height is H, HD > 1 / 3 It is a rotary compressor that satisfies the requirements of any of the first to fifth viewpoints.

[0017] According to the rotary compressor from the sixth perspective, cylinder deformation can be further suppressed.

[0018] The refrigeration system according to the first perspective comprises a rotary compressor according to any of the first to sixth perspectives.

[0019] According to the refrigeration device of the first aspect, deformation of the cylinder in the rotary compressor included in the refrigeration device can be suppressed.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 1 is a cross-sectional view of a rotary compressor according to the first embodiment. [Figure 2] FIG. 2 is an enlarged cross-sectional view of a cylinder portion in the rotary compressor according to the first embodiment. [Figure 3] FIG. 3 is an enlarged cross-sectional view of a cylinder portion in the rotary compressor according to the second embodiment. [Figure 4] FIG. 4 is a cross-sectional view of a cylinder in the rotary compressor according to the third embodiment. [Figure 5] FIG. 5 is a diagram showing an outline of a refrigeration device including the rotary compressor according to the present embodiment.

Modes for Carrying Out the Invention

[0021] <First Embodiment> A specific example of the rotary compressor of the first embodiment will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, and is intended to be indicated by the claims and to include all modifications within the meaning and scope equivalent to the claims.

[0022] Regarding the description of the specifications and drawings according to each embodiment, for components having substantially the same or corresponding functional configurations, duplicate descriptions may be omitted by assigning the same reference numerals. Also, for ease of understanding, the scales of each part in the drawings may be different from the actual ones.

[0023] In directions such as parallel, right-angled, orthogonal, horizontal, vertical, up and down, left and right, and front and back, a deviation that does not impair the effects of the embodiment is allowed. The shape of the corners is not limited to right-angles and may be rounded. Parallel, right-angled, orthogonal, horizontal, and vertical may each include substantially parallel, substantially right-angled, substantially orthogonal, substantially horizontal, and substantially vertical.

[0024] For example, "approximately parallel" means that two lines or two planes can be treated as parallel to each other within a manufacturingly acceptable range, even if they are not perfectly parallel. Similarly, "approximately right angle," "approximately perpendicular," "approximately horizontal," and "approximately vertical" are intended to apply as long as the relative positions of the two lines or two planes are within a manufacturingly acceptable range.

[0025] A rotary compressor according to the first embodiment will now be described. The rotary compressor according to the first embodiment includes a drive shaft that rotates around a first axis along a first direction, and a cylindrical cylinder that forms a cylinder chamber inside and has an inner circumferential surface which is a cylindrical surface having a central axis in the first direction, and an outer circumferential surface. The rotary compressor according to the first embodiment also includes a piston fixed to the drive shaft and rotating eccentrically in the cylinder chamber, and a bearing portion arranged adjacent to the cylinder and having a discharge port for compressed refrigerant. Furthermore, in the rotary compressor according to the first embodiment, the width of the cylinder is defined as the difference between the distance from the first axis to the outer circumferential surface and the distance from the first axis to the inner circumferential surface. In the rotary compressor according to the first embodiment, at least in the range corresponding to the discharge port, the width of the cylinder in the first range in the first direction is smaller than the width of the cylinder in the second range which is different from the first range in the first direction.

[0026] Furthermore, in the rotary compressor according to the first embodiment, the cylinder has a first surface facing the discharge port and a second surface opposite to the first surface, the first range is the range including the first surface, and the second range is the range including the second surface. In addition, the outer surface of the rotary compressor according to the first embodiment has a shape that is inclined with respect to the first direction.

[0027] Figure 1 is a cross-sectional view of a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. The rotary compressor 1 is a fully enclosed rotary compressor. The rotary compressor 1 is installed, for example, in a refrigerant circuit that performs a vapor compression type refrigeration cycle. The rotary compressor 1, for example, sucks in the refrigerant evaporated in the evaporator and compresses it.

[0028] The rotary compressor 1 comprises a casing 2, an electric motor 10, and a compression mechanism 15. The electric motor 10 and the compression mechanism 15 are each housed in the casing 2.

[0029] [Casing 2] Casing 2 is a cylindrical sealed container. Casing 2 comprises a body 3, an upper end plate 4, and a lower end plate 5. The ends of the body 3 are closed by the upper end plate 4 and the lower end plate 5, respectively. The casing 2 is sealed by the body 3 being closed by the pair of upper end plates 4 and lower end plates 5.

[0030] The body section 3 has a cylindrical shape. The suction pipe 7 and the suction pipe 8 are attached to the lower part of the body section 3, which is part of the casing 2. The upper end plate 4 and the lower end plate 5 are each dish-shaped. The discharge pipe 6 is attached to the upper end plate 4, which is part of the casing 2.

[0031] [Electric motor 10] The electric motor 10 drives the compression mechanism 15. The electric motor 10 is located in the upper part of the internal space of the casing 2. The electric motor 10 comprises a stator 11 and a rotor 12. The stator 11 is fixed to the body 3 of the casing 2. The stator 11 comprises, for example, coils and a stator core. The rotor 12 comprises, for example, permanent magnets. The rotor 12 is connected to a drive shaft 70 in the compression mechanism 15, which will be described later. The drive shaft 70 rotates around a rotation axis AX that extends in the direction indicated by the arrow DZ.

[0032] [Compression mechanism 15] The compression mechanism 15 is a two-cylinder rotary fluid machine. The compression mechanism 15 is located below the electric motor 10 in the internal space of the casing 2. The compression mechanism 15 comprises a bearing section 20, a cylinder 30, a middle plate 50, a cylinder 35, and a bearing section 25. The compression mechanism 15 also comprises a piston 40 that rotates eccentrically in the cylinder chamber of cylinder 30, and a piston 45 that rotates eccentrically in the cylinder chamber of cylinder 35. Furthermore, the compression mechanism 15 comprises a drive shaft 70 that rotates around a rotation axis along the vertical direction. Each of the pistons 40 and 45 is composed of a circular roller and vanes that partition the compression chamber.

[0033] (Bearing part 20) The bearing portion 20 comprises a main body portion 21, a main bearing portion 22, and an outer peripheral wall portion 23. The bearing portion 20 is formed by integrally molding the main body portion 21, the main bearing portion 22, and the outer peripheral wall portion 23.

[0034] The main body portion 21 has a disc-like shape. The main body portion 21 is positioned above and adjacent to the cylinder 30. The main body portion 21 is positioned to cover the upper end face of the cylinder 30. The lower surface of the main body portion 21 is in close contact with the cylinder 30.

[0035] The main bearing portion 22 is provided protruding upward from the main body portion 21. The main bearing portion 22 has a cylindrical shape. The main bearing portion 22 rotatably supports the drive shaft 70. The main bearing portion 22 constitutes a radial bearing.

[0036] The outer peripheral wall portion 23 has a thick, annular shape at the outer peripheral edge of the main body portion 21. The outer peripheral wall portion 23 is fixed to the body portion 3 of the casing 2.

[0037] The bearing section 20 has a discharge port 24. The discharge port 24 penetrates the main body section 21. The bearing section 20 is equipped with a discharge valve at the discharge port 24.

[0038] (Cylinder 30) The cylinder 30 forms a cylinder chamber inside. The cylinder 30 has a cylindrical shape. The piston 40 rotates eccentrically within the cylinder chamber of the cylinder 30.

[0039] The shape of the cylinder 30 will now be described in detail. Figure 2 is an enlarged cross-sectional view of the cylinder portion of a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment.

[0040] The cylinder 30 has an upper end face 30S1, a lower end face 30S2, an outer circumferential surface 30S3, and an inner circumferential surface 30S4. The upper end face 30S1 and the lower end face 30S2 are both planes extending horizontally. The upper end face 30S1 faces the discharge port. The lower end face 30S2 is the surface opposite to the upper end face 30S1.

[0041] The inner circumferential surface 30S4 is a cylindrical surface with the rotation axis AX as its central axis. The outer circumferential surface 30S3 has a shape that is inclined with respect to the direction in which the rotation axis AX extends. For example, the outer circumferential surface 30S3 is inclined with respect to the rotation axis AX at an angle in the range of 40 to 60 degrees, for example, 50 degrees.

[0042] In cylinder 30, the cylinder width TH1 in range R1 is smaller than the cylinder width TH2 in range R2, which is different from range R2. For example, width TH1 is smaller than width TH2 by a range of 1 to 20 millimeters, for example, by a length of 5 millimeters.

[0043] The width of the cylinder is defined as the difference between the distance from the rotation axis AX to the outer circumferential surface 30S3 and the distance from the rotation axis AX to the inner circumferential surface 30S4.

[0044] To explain in more detail, the cylinder width TH1 in range R1 is determined by the difference between the distance L12 from the rotation axis AX to the outer surface 30S3 and the distance L11 from the rotation axis AX to the inner surface 30S4 in range R1 (TH1 = L12 - L11). The distance L12 from the rotation axis AX to the outer surface 30S3 in range R1 may be, for example, the average, minimum, or maximum value of the distance from the rotation axis AX to the outer surface 30S3 in range R1. Alternatively, the distance L12 from the rotation axis AX to the outer surface 30S3 in range R1 may be the distance to the top of the cylinder in range R1.

[0045] Furthermore, the cylinder width TH2 in range R2 is determined by the difference between the distance L22 from the rotation axis AX to the outer surface 30S3 and the distance L11 from the rotation axis AX to the inner surface 30S4 in range R2 (TH2 = L22 - L11). The distance L22 from the rotation axis AX to the outer surface 30S3 in range R2 may be, for example, the average, minimum, or maximum value of the distance from the rotation axis AX to the outer surface 30S3 in range R2. Alternatively, the distance L22 from the rotation axis AX to the outer surface 30S3 in range R2 may be the distance to the lower end in range R2.

[0046] If we let D be the diameter of the inner surface 30S4, or in other words, the inner diameter of the cylinder 30, and H be its height, then the inner diameter D and height H should satisfy Equation 1.

[0047] H / D > 1 / 3 ··· Formula 1

[0048] (Middle Plate 50) The middle plate 50 is positioned between the cylinder 30 and the cylinder 35. The middle plate 50 has a disc-like shape. The middle plate 50 has a hole in its center through which the drive shaft 70 passes.

[0049] The middle plate 50 is in close contact with the lower end surface of the cylinder 30. The middle plate 50 covers the lower end surface of the cylinder 30. The middle plate 50 is also in close contact with the upper end surface of the cylinder 35. The middle plate 50 covers the upper end surface of the cylinder 35.

[0050] (Cylinder 35) The cylinder 35 forms a cylinder chamber inside. The cylinder 35 has a cylindrical shape. The piston 45 rotates eccentrically within the cylinder chamber of the cylinder 35.

[0051] (Bearing part 25) The bearing portion 25 comprises a main body portion 26, a sub-bearing portion 27, and an outer peripheral wall portion 28. The bearing portion 25 is formed by integrally molding the main body portion 26, the sub-bearing portion 27, and the outer peripheral wall portion 28.

[0052] The main body portion 26 has a disc-like shape. The main body portion 26 is positioned below and adjacent to the cylinder 35. The main body portion 26 is positioned to cover the lower end surface of the cylinder 35. The upper surface of the main body portion 26 is in close contact with the cylinder 35.

[0053] The sub-bearing portion 27 is provided protruding downward from the main body portion 26. The sub-bearing portion 27 has a cylindrical shape. The sub-bearing portion 27 rotatably supports the drive shaft 70. The sub-bearing portion 27 constitutes a radial bearing.

[0054] The outer peripheral wall portion 28 has a thick, annular shape at the outer peripheral edge of the main body portion 26.

[0055] The bearing section 25 has a discharge port 29. The discharge port 29 penetrates the main body section 26. The bearing section 25 is equipped with a discharge valve at the discharge port 29.

[0056] (Drive shaft 70) The drive shaft 70 rotates around the rotation axis AX. The drive shaft 70 has a main shaft portion 72, an eccentric portion 75, an intermediate connecting portion 78, an eccentric portion 76, and a sub-shaft portion 74. In the drive shaft 70, the main shaft portion 72, the eccentric portion 75, the intermediate connecting portion 78, the eccentric portion 76, and the sub-shaft portion 74 are integrally formed. The drive shaft 70 has a passage 71 for supplying lubricating oil to the sliding parts between the drive shaft 70 and the pistons 40, 45, the main bearing portion 22, and the sub-bearing portion 27.

[0057] The main shaft portion 72 has a cylindrical or cylindrical shape with the rotation axis AX as its central axis. The upper end of the main shaft portion 72 is connected to the rotor 12 of the electric motor 10. The lower end of the main shaft portion 72 is rotatably supported by the main bearing portion 22. The lower end of the main shaft portion 72 constitutes a journal.

[0058] The eccentric portion 75 is a cylindrical part with a larger diameter than the main shaft portion 72. The central axis of the eccentric portion 75 is eccentric from the rotation axis AX. The piston 40 is attached to the eccentric portion 75.

[0059] The intermediate connecting section 78 connects the eccentric section 75 and the eccentric section 76.

[0060] The eccentric portion 76 is a cylindrical part with a larger diameter than the main shaft portion 72. The central axis of the eccentric portion 76 is eccentric from the rotation axis AX. The eccentric portion 76 is eccentric with respect to the rotation axis AX on the opposite side from the eccentric portion 75. The piston 45 is attached to the eccentric portion 75.

[0061] The sub-shaft portion 74 has a cylindrical or cylindrical shape with the rotation axis AX as its central axis. The sub-shaft portion 74 is rotatably supported by the sub-bearing portion 27. The sub-shaft portion 74 constitutes a journal.

[0062] In the rotary compressor according to the first embodiment, the cylinder width in a first range in a first direction is smaller than the cylinder width in a second range different from the first range in the first direction, thereby suppressing deformation of the cylinder during operation. By suppressing cylinder deformation, the rotary compressor according to the first embodiment can suppress the occurrence of liquid compression when compressing the refrigerant, for example, by preventing oil from accumulating in the deformed area. By suppressing the occurrence of liquid compression, the rotary compressor according to the first embodiment can suppress damage to the piston, for example.

[0063] <Second Embodiment> In the rotary compressor according to the second embodiment, the outer surface of the cylinder has a step, unlike the outer surface of the cylinder in the rotary compressor according to the first embodiment.

[0064] A specific example of the rotary compressor of the second embodiment will now be described. The rotary compressor according to the second embodiment is equipped with a cylinder 130 in place of the cylinder 30 in the rotary compressor 1, which is an example of the rotary compressor according to the first embodiment.

[0065] The components other than the cylinder 130 will be described here by referring to the example in rotary compressor 1, which is an example of a rotary compressor according to the first embodiment.

[0066] (Cylinder 130) The cylinder 130 forms a cylinder chamber inside. The cylinder 130 has a cylindrical shape. The piston 40 rotates eccentrically within the cylinder chamber of the cylinder 130.

[0067] The shape of the cylinder 130 will now be described in detail. Figure 3 is an enlarged cross-sectional view of the cylinder portion in the rotary compressor according to the second embodiment.

[0068] The cylinder 130 has an upper end face 130S1, a lower end face 130S2, an outer circumferential surface 130S3, and an inner circumferential surface 130S4. The upper end face 130S1 and the lower end face 130S2 are both planes extending horizontally. The upper end face 130S1 faces the discharge port. The lower end face 130S2 is the surface opposite to the upper end face 130S1.

[0069] The cylinder 130 has a step 131 on its outer circumferential surface 130S3.

[0070] Similar to cylinder 30, cylinder 130 has a cylinder width TH1 in range R1 that is smaller than the cylinder width TH2 in range R2, which is different from range R2.

[0071] In the rotary compressor according to the second embodiment, the cylinder width in a first range in the first direction is smaller than the cylinder width in a second range different from the first range in the first direction, thereby suppressing deformation of the cylinder during operation. The rotary compressor according to the second embodiment has the same effects as the rotary compressor according to the first embodiment.

[0072] <Third Embodiment> In the rotary compressor according to the third embodiment, unlike the rotary compressor according to the first embodiment, only a portion of the circumferential direction of the outer surface of the cylinder is thickened.

[0073] A specific example of the rotary compressor of the third embodiment will now be described. The rotary compressor according to the third embodiment is equipped with a cylinder 230 in place of the cylinder 30 in the rotary compressor 1, which is an example of the rotary compressor according to the first embodiment.

[0074] The components other than the cylinder 230 will be described here by referring to the example in rotary compressor 1, which is an example of a rotary compressor according to the first embodiment.

[0075] In the rotary compressor according to the third embodiment, the circumferential range A1 on the discharge port side, which includes the portion containing the discharge port 24, has an outer peripheral surface 230S3 that is inclined with respect to the rotation axis AX. On the other hand, the circumferential range A2 on the intake port side, which does not include the discharge port 24, has an outer peripheral surface 230S5 that is parallel to the rotation axis AX. In other words, the width of the cylinder 230 in the lower range on the discharge port 24 side of the cylinder 230 is greater than the width of the cylinder 230 in the lower range on the intake port 233 side of the cylinder 230.

[0076] The outer surface 230S3 may have steps, as in the rotary compressor according to the second embodiment.

[0077] In the rotary compressor according to the third embodiment, the cylinder width in a first range in the first direction is smaller than the cylinder width in a second range different from the first range in the first direction, thereby suppressing deformation of the cylinder during operation. The rotary compressor according to the third embodiment has the same effects as the rotary compressor according to the first embodiment. According to the rotary compressor according to the third embodiment, the increase in weight can be suppressed by increasing the thickness of the cylinder in only a part of the circumferential direction.

[0078] <Refrigeration equipment> A refrigeration system equipped with a rotary compressor according to this embodiment will be described. Figure 5 is a schematic diagram of a refrigeration system 100, which is an example of a refrigeration system equipped with a rotary compressor according to this embodiment.

[0079] The refrigeration system 100 includes a compressor 101, a four-way valve 102, a heat exchanger 103, an expansion valve 104, and a heat exchanger 105. The compressor 101 is a rotary compressor according to this embodiment.

[0080] First, we will explain the case where the refrigeration system 100 is cooled by the heat exchanger 105. Figure 5 shows the connections when the refrigeration system 100 is cooled by the heat exchanger 105.

[0081] The refrigerant compressed by the compressor 101 is supplied to the heat exchanger 103 through the four-way valve 102. In the heat exchanger 103, the refrigerant supplied to the heat exchanger 103 is cooled by heat exchange with air or the like. The refrigerant cooled in the heat exchanger 103 condenses and liquefies, and is supplied to the expansion valve 104. The refrigerant is depressurized by the expansion valve 104. The depressurized refrigerant is supplied to the heat exchanger 105. In the heat exchanger 105, the refrigerant evaporates and vaporizes. The refrigerant discharged from the heat exchanger 105 then returns to the compressor 101 and is compressed again. In the heat exchanger 105, the refrigeration device 100 cools the object by the heat of vaporization caused by the evaporation of the refrigerant.

[0082] Next, we will explain the case where the refrigeration system 100 is heated by the heat exchanger 105. The refrigerant compressed by the compressor 101 is supplied to the heat exchanger 105 through the four-way valve 102. In the heat exchanger 105, the refrigeration system 100 heats the object by supplying the compressed, high-temperature refrigerant. The refrigerant that has undergone heat exchange in the heat exchanger 105 condenses and liquefies, and is supplied to the expansion valve 104. The refrigerant is depressurized by the expansion valve 104. The depressurized refrigerant is supplied to the heat exchanger 103. In the heat exchanger 103, the refrigerant evaporates and vaporizes by exchanging heat with air or the like. The refrigerant discharged from the heat exchanger 103 then passes through the four-way valve 102 and returns to the compressor 101 to be compressed again.

[0083] Although embodiments have been described above, it will be understood that various modifications to the form and details are possible without departing from the spirit and scope of the claims. Various modifications and improvements are possible, such as combinations or substitutions with parts or all of other embodiments. [Explanation of Symbols]

[0084] 1. Rotary Compressor 2 Casing 10 Electric motor 11 Stator 12 rotors 15 Compression mechanism 20, 25 Bearing section 21, 26 Main body 22 Main bearing part 27 Secondary bearing part 23, 28 Outer wall 24, 29 outlet 30, 130, 230 cylinders 30S1, 130S1 Upper end surface 30S2, 130S2 lower end surface 30S3, 130S3, 230S3, 230S5 outer surface 30S4, 130S4, 230S4 inner surface 35 cylinders 40, 45 pistons 50 Middle Plate 70 Drive shaft 100 Refrigeration equipment 101 Compressor 102 Four-way valve 103 Heat exchanger 104 Expansion valve 105 Heat exchanger 131 steps 233 Inlet A1, A2 range AX rotation axis L11, L12, L22 distance R1, R2 range TH1, TH2 width

Claims

1. A drive shaft (70) that rotates about a first axis (AX) along a first direction (DZ), A cylindrical cylinder (30, 130, 230) having a cylinder chamber inside and an inner circumferential surface (30S4, 130S4, 230S4) which is a cylindrical surface having a central axis in the first direction (DZ), and an outer circumferential surface (30S3, 130S3, 230S3), A piston (40) is fixed to the drive shaft (70) and rotates eccentrically within the cylinder chamber, A bearing section (20) is positioned adjacent to the cylinders (30, 130, 230) and has a compressed refrigerant discharge port (24) formed therein, Equipped with, The width of the cylinders (30, 130, 230) is defined as the difference between the distance (L12, L22) from the first axis (AX) to the outer circumferential surface (30S3, 130S3, 230S3) and the distance (L11) from the first axis (AX) to the inner circumferential surface (30S4, 130S4, 230S4). At least in the range corresponding to the discharge port (24), the width (TH1) of the cylinders (30, 130, 230) in the first range (R1) in the first direction (DZ) is smaller than the width (TH2) of the cylinders (30, 130, 230) in the second range (R2) which is different from the first range (R1) in the first direction (DZ). Rotary compressor (1).

2. The cylinders (30, 130, 230) have a first surface (30S1, 130S1) facing the discharge port (24) and a second surface (30S2, 130S2) opposite to the first surface (30S1, 130S1). The first range (R1) includes the first surface (30S1, 130S1), and the second range (R2) includes the second surface (30S2, 130S2). The rotary compressor (1) according to claim 1.

3. The outer circumferential surface (130S3) has a step (131), The rotary compressor (1) according to claim 2.

4. The outer circumferential surfaces (30S3, 230S3) have a shape that is inclined with respect to the first direction (DZ). The rotary compressor (1) according to claim 2.

5. The width of the cylinder (230) in the second range (R2) on the discharge port (24) side (A1) of the cylinder (230) is greater than the width of the cylinder (230) in the second range (R2) on the suction port side (A2) of the cylinder (230). A rotary compressor (1) according to any one of claims 1 to 4.

6. When the inner diameter of the cylinder (30, 130, 230) is D and the height is H, HD / D > 1 / 3 Satisfying A rotary compressor (1) according to any one of claims 1 to 4.

7. A rotary compressor (1) according to any one of claims 1 to 4, Refrigeration device (100).

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