Rotary compressor and refrigeration system

Abstract

This disclosure provides a rotary compressor that allows lubricating oil to flow smoothly from the top to the bottom inside the casing. [Solution] A rotary compressor comprising: a shaft extending along a first direction; a cylinder forming a cylinder chamber inside; a roller fixed to the shaft and rotating eccentrically in the cylinder chamber; an upper bearing supporting the shaft and having a first discharge port for discharging compressed refrigerant; a muffler covering the first discharge port and having a second discharge port for discharging the refrigerant discharged from the first discharge port; a rotor to which the shaft is fixed; a stator; a motor for rotating the shaft; and a first cylindrical member attached to the upper bearing, wherein the stator comprises a coil, a stator core, and an insulator insulating the space between the coil and the stator core, and the first member is provided outside the second discharge port with respect to the radial direction of the shaft in a view from the first direction, and the upper end of the first member is provided above the lower end of the insulator.

Description

Technical Field

[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 rotates eccentrically, a so-called swing type in which a vane formed integrally with the roller swings as the roller rotates eccentrically, and a so-called hinge vane type in which the tip of the vane is rotatably fitted into a recess on the outer peripheral surface of the roller and the roller rotates eccentrically, etc.

Background Art

[0002] Patent Document 1 discloses a compressor including a compression mechanism for compressing refrigerant gas and an electric motor for driving the compression mechanism in a sealed container. Patent Document 1 discloses that the compression mechanism has a discharge port that opens only into an internal space partitioned by a partitioning member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art disclosed in Patent Document 1, it is possible to separate the internal and external spaces by a partitioning member. However, in the prior art, it is necessary to provide a certain gap so that the partitioning member does not contact the compression mechanism. Since the provided gap is close to the muffler discharge hole, gas and oil may be lifted up in the internal space partitioned by the partitioning member, and the oil separation performance may deteriorate.

[0005] This disclosure provides a rotary compressor that allows lubricating oil to flow smoothly from the top to the bottom inside the casing. [Means for solving the problem]

[0006] The rotary compressor from the first perspective is, A shaft extending along the first direction, A cylinder that forms a cylinder chamber inside, A roller fixed to the shaft and rotating eccentrically within the cylinder chamber, An upper bearing supporting the shaft and having a first discharge port for discharging compressed refrigerant, A muffler having a second discharge port that covers the first discharge port and discharges the refrigerant discharged from the first discharge port, The system includes a rotor to which the shaft is fixed, a stator, and a motor that rotates the shaft. A first member having a cylindrical shape that is attached to the upper bearing, Equipped with, The stator comprises a coil, a stator core, and an insulator that insulates the space between the coil and the stator core. The first member is provided outside the second discharge port with respect to the radial direction of the shaft in the first viewing direction, The upper end of the first member is provided above the lower end of the insulator. It is a rotary compressor.

[0007] According to the rotary compressor of the first perspective, the first member is attached to the upper bearing, and the upper end of the compartment member is positioned above the lower end of the insulator, thereby effectively compartmentalizing the space from which the refrigerant is discharged while obstructing the gas flow from the space outside the compartment member. In the rotary compressor of the first perspective, by compartmentalizing the space from which the refrigerant is discharged with the first member, lubricating oil flowing from top to bottom can be made to flow smoothly.

[0008] The rotary compressor from the second perspective is, The device comprises the shaft, the cylinder, the roller, the upper bearing, the muffler, the motor, and a casing that houses the first member. The first member is provided on the inside of the insulator with respect to the radial direction of the shaft in the first viewing direction. This is a rotary compressor from the first perspective.

[0009] According to the rotary compressor from the second perspective, the first component partitions the space inside the insulator where the refrigerant is discharged in the radial direction of the shaft, thereby allowing the lubricating oil to flow smoothly from top to bottom.

[0010] The rotary compressor from the third perspective is, The lower end of the first member is provided below the second discharge port. This is a rotary compressor from a second perspective.

[0011] According to the rotary compressor from the third perspective, the lower end of the first member is located below the second discharge port, and by partitioning the space through which the refrigerant is discharged, the lubricating oil flowing from top to bottom can be made to flow smoothly.

[0012] The rotary compressor from the fourth perspective is, The upper bearing has a circumferential step on its upper surface. The first member is fitted into the step, or the first member is fastened to the upper bearing on the side of the step. It is a rotary compressor from either the first or third perspective.

[0013] According to the rotary compressor of the fourth perspective, the positioning of the first member can be easily performed.

[0014] The rotary compressor from the fifth perspective is, The first member is formed of a resin material. It is a rotary compressor from either the first or fourth perspective.

[0015] According to the rotary compressor of the fifth aspect, the weight increased by the first member can be reduced.

[0016] The refrigeration device of the first aspect is A refrigeration device including a compressor according to any one of the first aspect to the fifth aspect.

[0017] According to the refrigeration device of the first aspect, in the compressor included in the refrigeration device, the first member is attached to the upper bearing, and the upper end of the partitioning member is provided above the lower end of the insulator, so that while inhibiting the gas flow from the space outside the partitioning member, the space where the refrigerant is effectively discharged can be partitioned. The compressor included in the refrigeration device can be configured such that the lubricating oil flowing from the upper part to the lower part can flow smoothly by partitioning the space where the refrigerant is discharged by the first member.

Brief Description of the Drawings

[0018] [Figure 1] FIG. 1 is a perspective view of a rotary compressor according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a rotary compressor according to the first embodiment. [Figure 3] FIG. 3 is an exploded perspective view of a stator in a motor included in the rotary compressor according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view of a rotary compressor according to the first embodiment. [Figure 5] FIG. 5 is a diagram for explaining the flow of lubricating oil in the rotary compressor according to the first embodiment. [Figure 6] FIG. 6 is a diagram for explaining the flow of lubricating oil in the rotary compressor according to the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view of a rotary compressor according to the second embodiment. [Figure 8] FIG. 8 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

[0019] <First Embodiment> A specific example of the rotary compressor of the first embodiment will be described below with reference to the drawings. However, this disclosure is not limited to these examples, and all modifications are intended to be included in the meaning and scope equivalent to the claims, as indicated by the claims.

[0020] In addition, regarding the descriptions and drawings of each embodiment, components having substantially the same or corresponding functional configurations may be denoted by the same reference numerals, thereby omitting redundant explanations. Furthermore, for ease of understanding, the scale of each part in the drawings may differ from the actual scale.

[0021] A degree of deviation is permissible in directions such as parallel, right angles, orthogonal, horizontal, vertical, up and down, left and right, and front and back, as long as it does not impair the effects of the embodiment. The shape of the corners is not limited to right angles and may be rounded. Parallel, right angles, orthogonal, horizontal, and vertical may include approximately parallel, approximately right angles, approximately orthogonal, approximately horizontal, and approximately vertical, respectively.

[0022] 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.

[0023] A rotary compressor according to the first embodiment will now be described. The rotary compressor according to the first embodiment comprises a shaft extending in a first direction, a cylinder forming a cylinder chamber inside, and a roller fixed to the shaft and rotating eccentrically in the cylinder chamber. The rotary compressor according to the first embodiment also comprises an upper bearing that supports the shaft and has a first discharge port for discharging compressed refrigerant, and a muffler that covers the first discharge port and has a second discharge port for discharging the refrigerant discharged from the first discharge port. Furthermore, the rotary compressor according to the first embodiment comprises a rotor to which the shaft is fixed, a stator, a motor for rotating the shaft, and a first cylindrical member attached to the upper bearing. The stator in the rotary compressor according to the first embodiment comprises a coil, a stator core, and an insulator that insulates the space between the coil and the stator core. In the rotary compressor according to the first embodiment, the first member is provided outside the second discharge port with respect to the radial direction of the shaft in a first view, and the upper end of the first member is provided above the lower end of the insulator.

[0024] Figure 1 is a perspective view of a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. Figure 2 is a cross-sectional view of a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment.

[0025] For ease of explanation, drawings may sometimes include a virtual three-dimensional coordinate system (XYZ Cartesian coordinate system) consisting of mutually orthogonal X, Y, and Z axes (XYZ axes). For example, when a coordinate axis perpendicular to the plane of the drawing is shown with a black circle inside, it indicates that the coordinate axis is pointing towards the viewer relative to the plane of the drawing. Conversely, when a coordinate axis is shown with an X inside, it indicates that the coordinate axis is pointing away from the plane of the drawing.

[0026] However, this coordinate system is defined for illustrative purposes only and is not limited to the orientation of the rotary compressor, etc., according to this embodiment.

[0027] In the following diagram, the shaft 81 of the rotary compressor 1 extends in the direction along the Z-axis, and the rollers 61 and 62 of the rotary compressor 1 rotate in a plane parallel to the XY plane, which includes the X and Y axes.

[0028] A view of an object along the Z-axis, looking from the +Z side in the opposite direction of the Z-axis, is called a plan view. A view of an object along the Z-axis, looking from the +Z side in the opposite direction of the Z-axis, is called a bottom view. A view of an object along the Z-axis, looking from the -Z side in the direction of the Z-axis, is called a bottom view.

[0029] The rotary compressor 1 compresses a refrigerant. The refrigerant used in the rotary compressor 1 is, for example, carbon dioxide. However, the refrigerant is not limited to carbon dioxide; for example, fluorocarbon-based, hydrofluoroolefin-based, or hydrocarbon-based refrigerants may also be used. The rotary compressor 1 comprises a compressor body 10 and an accumulator 20.

[0030] [Compressor body 10] The compressor body 10 comprises a casing 11, an intake pipe 12, an exhaust pipe 13, and power terminals 15. The casing 11 also includes a plate 14 for mounting the compressor body 10.

[0031] The casing 11 is a cylindrical sealed container. The casing 11 comprises a body portion 11a, an upper end plate 11b, and a lower end plate 11c. The end of the body portion 11a is closed by the upper end plate 11b and the lower end plate 11c, respectively. The casing 11 is sealed by the body portion 11a being closed by the pair of upper end plates 11b and lower end plates 11c.

[0032] The body portion 11a has a cylindrical shape. The intake pipe 12 is attached to the lower part of the body portion 11a of the casing 11. The upper end plate 11b and the lower end plate 11c each have a dish shape. The exhaust pipe 13 is attached to the upper part of the body portion 11a of the casing 11.

[0033] The compressor body 10 includes a compression mechanism 70 and a motor 80 inside the casing 11. The motor 80 rotates the shaft 81. The compression mechanism 70 compresses the refrigerant supplied from the suction pipe 12. The refrigerant compressed in the compression mechanism 70 is discharged to the outside of the rotary compressor 1 through the exhaust pipe 13.

[0034] Motor 80 rotates shaft 81. Shaft 81 is connected to rollers 61 and 62, respectively. In the compression mechanism 70, shaft 81, rotated by motor 80, rotates rollers 61 and 62, respectively. Rollers 61 and 62 rotate eccentrically as shaft 81 rotates. As rollers 61 and 62 rotate, the refrigerant is compressed in the compression mechanism 70. The compression chamber is partitioned by vanes as rollers 61 and 62 rotate.

[0035] The motor 80 comprises a rotor 80a and a stator 80b. The rotor 80a has magnets and a rotor core.

[0036] The stator 80b will now be described. Figure 3 is an exploded perspective view of the stator 80b in the motor 80 of the rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. The stator 80b comprises an insulator 80b1, a plurality of coils 80b2, a stator core 80b3, and an insulator 80b4. The insulators 80b1 and 80b4 each insulate the coils 80b2 and the stator core 80b3, respectively.

[0037] The stator core 80b3 is formed, for example, by laminating plate-shaped members made of a soft magnetic material. The stator core 80b3 has an annular portion 80b3c and a plurality of tooth portions 80b3t. The annular portion 80b3c has a substantially annular shape when viewed from above. The annular portion 80b3c is fixed to the body portion 11a of the casing 11. By fixing the annular portion 80b3c to the body portion 11a of the casing 11, the motor 80 is attached to the casing 11. The tooth portions 80b3t are provided protruding radially inward. The tooth portions 80b3t are arranged at equal intervals in the circumferential direction.

[0038] The insulator 80b1 is mounted on top of the stator core 80b3. The insulator 80b1 has a projection 80b1t that protrudes inward, corresponding to the teeth portion 80b3t of the stator core 80b3. The circumferential width of the projection 80b1t is wider than the circumferential width of the teeth portion 80b3t.

[0039] The insulator 80b4 is attached to the lower part of the stator core 80b3. The insulator 80b4 has a projection 80b4t that protrudes inward, corresponding to the teeth portion 80b3t of the stator core 80b3. The circumferential width of the projection 80b4t is wider than the circumferential width of the teeth portion 80b3t. The insulator 80b4 has a cylindrical portion 80b4p that extends downward.

[0040] The stator 80b has the same number of coils 80b2 as the teeth portion 80b3t of the stator core 80b3. The coils 80b2 are wound between the protrusion 80b1t of the insulator 80b1 and the protrusion 80b4t of the insulator 80b4, with the teeth portion 80b3t in between.

[0041] The shaft 81 has a passage through which lubricating oil flows. The shaft 81 has a communication hole that penetrates from the internal passage to the outside of the shaft 81 in order to supply lubricating oil to the lower bearing 31, cylinder 41, cylinder 42, and upper bearing 32, respectively.

[0042] The shaft 81 has a main shaft portion 82, an eccentric portion 83, an intermediate connecting portion 84, an eccentric portion 86, and a sub-shaft portion 87. In the shaft 81, the main shaft portion 82, the eccentric portion 83, the intermediate connecting portion 84, the eccentric portion 86, and the sub-shaft portion 87 are formed integrally.

[0043] The main shaft portion 82 has a cylindrical or cylindrical shape. The upper end of the main shaft portion 82 is connected to the rotor of the motor 80. The lower end of the main shaft portion 82 is rotatably supported by the upper bearing 32. The lower end of the main shaft portion 82 forms a journal.

[0044] The eccentric portion 83 is a cylindrical part with a larger diameter than the main shaft portion 82. The central axis of the eccentric portion 83 is eccentric to the central axis of the main shaft portion 82. A roller 62 is attached to the eccentric portion 83.

[0045] The intermediate connecting section 84 connects the eccentric section 83 and the eccentric section 86.

[0046] The eccentric portion 86 is a cylindrical part with a larger diameter than the main shaft portion 82. The central axis of the eccentric portion 86 is eccentric from the central axis of the main shaft portion 82. The eccentric portion 86 is eccentric with respect to the central axis of the main shaft portion 82 on the opposite side from the eccentric portion 83. A roller 61 is attached to the eccentric portion 86. The lower surface of the eccentric portion 86 slides against the upper surface of the lower bearing 31.

[0047] The sub-shaft portion 87 has a cylindrical or cylindrical shape. The sub-shaft portion 87 is rotatably supported by the lower bearing 31. The sub-shaft portion 87 constitutes a journal.

[0048] The compression mechanism 70 comprises a lower bearing 31, a cylinder 41, a middle plate 33, a cylinder 42, an upper bearing 32, and a muffler 90. In the compression mechanism 70, the lower bearing 31, cylinder 41, middle plate 33, cylinder 42, and upper bearing 32 are stacked in order from bottom to top. The muffler 90 is attached to the upper bearing 32 by bolts 91 (see Figure 4). The compression mechanism 70 is fixed to the casing 11 at the upper bearing 32.

[0049] The upper bearing 32 is positioned above the cylinders 41 and 42, respectively. The lower bearing 31 is positioned below the cylinders 41 and 42, respectively. The shaft 81 passes through the lower bearing 31, cylinder 41, middle plate 33, cylinder 42, and upper bearing 32. The shaft 81 has communication holes that penetrate from an internal flow path to the outside of the shaft 81 in order to supply lubricating oil to the lower bearing 31, cylinder 41, cylinder 42, and upper bearing 32, respectively.

[0050] The upper bearing 32 has a discharge port 32h for discharging compressed refrigerant. The upper bearing 32 also has a circumferential step 32a on its upper surface 32S1. The step 32a has a side surface 32S2. The upper bearing 32 has a main bearing portion 32b that rotatably supports the main shaft portion 82 of the shaft 81. The main bearing portion 32b is provided projecting upward from the center of the upper surface 32S1. The main bearing portion 32b has a cylindrical shape. The main bearing portion 32b constitutes a radial bearing.

[0051] The compression mechanism 70 includes a roller 61 that rotates eccentrically by a shaft 81 in a cylinder chamber formed inside the cylinder 41. The lower surface of the roller 61 slides against the upper surface of the lower bearing 31. The upper surface of the roller 61 also slides against the lower surface of the middle plate 33.

[0052] Furthermore, the compression mechanism 70 includes a roller 62 that rotates eccentrically by a shaft 81 in a cylinder chamber formed inside the cylinder 42. The lower surface of the roller 62 slides against the upper surface of the middle plate 33. The upper surface of the roller 62 also slides against the lower surface of the upper bearing 32.

[0053] The muffler 90 is installed to cover the discharge port 32h. The muffler 90 has a discharge port 90h for discharging the refrigerant discharged from the discharge port 32h.

[0054] The compression mechanism 70 includes a cover member 95 provided around the muffler 90. The cover member 95 is attached to the upper bearing 32. The upper bearing 32 has a step 32a on its upper surface 32S1. The step 32a has a circumferential shape when viewed from above. In other words, the step 32a is a circumferential step formed on the upper surface 32S1. The cover member 95 is attached to the upper bearing 32 by being fitted into the side surface 32S2 of the step 32a, or by being fastened to the side surface 32S2. The cover member 95 is made of a resin material.

[0055] The positional relationship between the cover member 95 and the insulator 80b4 and muffler 90 will be explained. Figure 4 is a cross-sectional view of a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. Specifically, Figure 4 is a cross-sectional view of the portion of the rotary compressor 1 where the cover member 95 and the insulator 80b4 overlap in the Z-axis direction.

[0056] As shown in Figure 4, the cover member 95 is provided outside the discharge port 90h with respect to the radial direction of the shaft 81.

[0057] Furthermore, as shown in Figure 2, the upper end 95u of the cover member 95 is located above the lower end 80b4b of the insulator 80b4. By having the upper end 95u of the cover member 95 located above the lower end 80b4b of the insulator 80b4, the refrigerant gas passing between the cover member 95 and the insulator 80b4 flows downward. Also, the lower end 95b of the cover member 95 is located below the discharge port 90h.

[0058] The flow of lubricating oil in a rotary compressor according to the first embodiment will be described. Figures 5 and 6 are diagrams illustrating the flow of lubricating oil in a rotary compressor 1, which is an example of a rotary compressor according to the first embodiment. Figure 6 is an enlarged view of the area near the primary space SA in Figure 5.

[0059] In the rotary compressor 1, the interior of the casing 11 is broadly divided into a primary space SA, which is the space below the motor 80, and a secondary space SB, which is the space above the motor 80. Space SC is indicated by a dot pattern hatching to show the area where lubricating oil is accumulated. Furthermore, the primary space SA is divided into an inner space SA1 and an outer space SA2 by a cover member 95.

[0060] The refrigerant gas discharged from outlet 90h, indicated by arrow A, into the inner space SA1 flows into the secondary space SB through rotor vents, air gaps, stator winding gaps, etc.

[0061] In the secondary space SB, the refrigerant gas rises straight up to the upper end plate 11b as shown by arrow B, and becomes a swirling component. The refrigerant gas is then discharged to the outside of the casing 11 from the exhaust pipe 13 connected to the secondary space SB.

[0062] In the secondary space SB, the refrigerant gas has a swirling component, causing the lubricating oil to be centrifuged. The centrifuged lubricating oil travels along the wall, passes between the stator core and the casing 11 as shown by arrow C, and then returns to space SC through the outer space SA2. The lubricating oil also returns to space SC through the flow path provided in the casing 11 and the upper bearing 32, as shown by arrow C.

[0063] The primary space SA is divided into an inner space SA1 and an outer space SA2 by the cover member 95. The cover member 95 can obstruct the gas flow from the outer space (outer space SA2) to the inner space (inner space SA1). The cover member 95 can effectively partition the inner space SA from which the refrigerant gas is discharged. The pressure in the inner space SA1 is high because the refrigerant gas is discharged from the discharge port 90h. On the other hand, the pressure in the outer space SA2 is lower because the primary space SA is divided by the cover member 95.

[0064] The pressure relationship of the refrigerant gas is such that the pressure is highest in the inner space SA1, followed by the secondary space SB, and finally the outer space SA2. Since the pressure in the outer space SA2 is lower than that in the secondary space SB, the lubricating oil that is centrifuged in the secondary space SB can easily travel along the wall, pass between the stator core and the casing 11, and then return to space SC through the outer space SA2.

[0065] Furthermore, since the upper end 95u of the cover member 95 is positioned above the lower end 80b4b of the insulator 80b4, the refrigerant gas passing between the cover member 95 and the insulator 80b4 flows downward. Because the refrigerant gas passing between the cover member 95 and the insulator 80b4 flows downward, the downward flow of lubricating oil can be promoted.

[0066] For example, if the cover member 95 is absent, the pressure in the primary space SA may become higher than the pressure in the secondary space SB. When the pressure in the primary space SA becomes higher than the pressure in the secondary space SB, the lubricating oil that has been centrifuged in the secondary space SB may not flow to the primary space SA even if it travels along the wall and between the stator core and the casing 11, because the pressure in the primary space SA is high. If the lubricating oil does not flow to the primary space SA and does not return to the space SC, oil leakage may occur.

[0067] According to the rotary compressor of the first embodiment, the first member is attached to the upper bearing, and the upper end of the partition member is provided above the lower end of the insulator, thereby effectively partitioning the space from which the refrigerant is discharged while obstructing the gas flow from the space outside the partition member. The rotary compressor of the first embodiment, by providing the first member, partitions the space from which the refrigerant is discharged, allowing lubricating oil to flow smoothly from top to bottom. The rotary compressor of the first embodiment, by providing the first member, allows lubricating oil to flow smoothly from top to bottom, thereby suppressing the occurrence of oil leakage.

[0068] <Second Embodiment> A rotary compressor according to a second embodiment will now be described. The rotary compressor according to the second embodiment differs in the shape of the first component.

[0069] Figure 7 is a cross-sectional view of a rotary compressor 2, which is an example of a rotary compressor according to the second embodiment. Rotary compressor 2 is equipped with a cover member 195 in place of the cover member 95 of rotary compressor 1.

[0070] The cover member 195 has a cylindrical portion 195a and a folded portion 195b that is folded back from the upper end of the cylindrical portion 195a.

[0071] According to the rotary compressor of the second embodiment, the gap between the first member and the insulator can be narrowed, thereby separating the inner space and the outer space in the primary space.

[0072] <Refrigeration equipment> A refrigeration system equipped with a rotary compressor according to this embodiment will be described. Figure 8 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.

[0073] 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.

[0074] First, we will explain the case where the refrigeration system 100 is cooled by the heat exchanger 105. Figure 8 shows the connections when the refrigeration system 100 is cooled by the heat exchanger 105.

[0075] 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.

[0076] 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.

[0077] 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]

[0078] 1, 2 Rotary compressors 10 Compressor body 11 Casing 31 Lower bearing 32 Upper bearing 32a Step 32h outlet 32S1 Top 32S2 side 33 Middle Plate 41, 42 cylinders 61, 62 Laura 70 Compression mechanism 80 Motor 80a rotor 80b stator 80b1 Insulator 80b2 coil 80b3 stator core 80b4 Insulator 80b4b bottom edge 80b4p Cylindrical part 80b4t protrusion 81 Shaft 90 Muffler 90h outlet 95, 195 Cover members 95b bottom end 95u top end 100 Refrigeration equipment 195a Cylindrical section 195b Return section SA primary space SA1 Interior Space SA2 outer space SB secondary space SC space

Claims

1. A shaft (81) extending along the first direction (Z), Cylinders (41, 42) that form a cylinder chamber inside, The rollers (61, 62) are fixed to the shaft (81) and rotate eccentrically within the cylinder chamber, An upper bearing (32) that supports the shaft (81) and has a first discharge port (32h) for discharging compressed refrigerant, A muffler (90) having a second discharge port (90h) that covers the first discharge port (32h) and discharges the refrigerant discharged from the first discharge port (32h), The system includes a rotor (80a) to which the shaft (81) is fixed, a stator (80b), and a motor (80) that rotates the shaft (81). A first cylindrical member (95, 195) is attached to the upper bearing (32), Equipped with, The stator (80b) comprises a coil (80b2), a stator core (80b3), and an insulator (80b4) that insulates the space between the coil (80b2) and the stator core (80b3). The first member (95, 195) is provided outside the second discharge port (90h) with respect to the radial direction of the shaft (81) in the first viewing direction, The upper end (95u) of the first member (95, 195) is provided above the lower end (80b4b) of the insulator (80b4). Rotary compressors (1, 2).

2. The device comprises a casing (11) that houses the shaft (81), the cylinders (41, 42), the rollers (61, 62), the upper bearing (32), the muffler (90), the motor (80), and the first member (95, 195), The first member (95, 195) is provided on the inside of the insulator (80b4) with respect to the radial direction of the shaft (81) in the first viewing direction. The rotary compressor (1, 2) according to claim 1.

3. The lower end (95b) of the first member (95, 195) is located below the second discharge port (90h). The rotary compressor (1, 2) according to claim 2.

4. The upper bearing (32) has a circumferential step (32a) on its upper surface (32S1), The first member (95, 195) is fitted into the step (32a), or the first member (95, 195) is fastened to the upper bearing (32) on the side surface (32S2) of the step (32a). A rotary compressor (1, 2) according to any one of claims 1 to 3.

5. The first member (95, 195) is formed of a resin material. A rotary compressor (1, 2) according to any one of claims 1 to 3.

6. A refrigeration system (100) comprising rotary compressors (1, 2) according to any one of claims 1 to 3.

Images