Rotary compressor

Abstract

The present application aims to provide a rotary compressor which can avoid excessive lubrication of lubricating oil supplied to a rotary compression mechanism section, and which can ensure strength even if a shaft diameter is reduced. To solve the problem, the rotary compressor of the present application is characterized by comprising: a hermetic container; an electric section provided on one side in the hermetic container; a rotary compression mechanism section provided on the other side in the hermetic container; a shaft connecting the electric section and the rotary compression mechanism section; and lubricating oil stored in the hermetic container, wherein the rotary compression mechanism section comprises: an eccentric section; a roller mounted to the eccentric section; a cylinder accommodating the roller; and a bearing plate closing the cylinder and supporting the shaft, and the bearing plate comprises an oil supply passage, one end of which faces the lubricating oil and the other end of which communicates with the cylinder.

Description

Technical Field

[0001] This invention relates to a rotary compressor. Background Technology

[0002] For example, a rotary compressor is provided as a compressor for an air conditioner. The rotary compressor includes an electric motor, a rotary compression mechanism connected to a shaft (crankshaft) corresponding to the rotation axis of the electric motor and driven by the operation of the electric motor, and a sealed container housing the electric motor and the rotary compression mechanism. Such a rotary compressor is disclosed, for example, in Patent Documents 1 and 2 below.

[0003] However, in the conventional rotary compressors shown in Patent Documents 1 and 2, for example, the lubricating oil used to lubricate appropriate parts within the rotary compression mechanism (the sliding areas between rotating rollers, cylinders, shafts, main bearings (main frames), auxiliary bearings (bearing plates), etc.) is stored in a sealed container. Furthermore, as shown in Patent Document 1, an oil supply passage for supplying lubricating oil is provided at the core of the shaft, and a component called a blade, which is a torsion plate, is installed inside the oil supply passage. Thus, the lubricating oil is drawn into the oil supply passage by the pressure difference inside and outside the cylinder (compression chamber) and the centrifugal force of the blade, and supplied to the appropriate locations within the rotary compression mechanism.

[0004] However, if the lubricating oil supply mechanism includes blades, for example, due to operating conditions such as high-speed operation, the amount of oil supplied to the rotary compressor unit may be excessive. Furthermore, in recent years, from the perspective of lightweighting rotary compressors and reducing energy consumption in the sliding area, although the shaft diameter has been reduced, the existing structure with the oil supply channel located within the shaft may not be able to ensure shaft strength. Therefore, a design to compensate for shaft strength is required.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 11-182429

[0008] Patent Document 2: Japanese Patent Publication No. 2020-526707 Summary of the Invention

[0009] The technical problem that the invention aims to solve

[0010] The present invention was made in view of the aforementioned technical problem, and its object is to provide a rotary compressor that, in addition to avoiding excessive lubrication of the lubricating oil supplied to the rotary compression mechanism, can ensure strength even when the shaft diameter is reduced.

[0011] Technical solutions for solving the problem

[0012] This invention provides a rotary compressor, characterized in that it comprises:

[0013] Sealed container;

[0014] An electric motor is disposed on one side inside the sealed container;

[0015] A rotary compression mechanism is disposed on the other side inside the sealed container;

[0016] A shaft connecting the electric motor and the rotary compression mechanism;

[0017] Lubricating oil, which is stored in the sealed container.

[0018] The rotary compression mechanism includes:

[0019] The roller rotates eccentrically as the shaft rotates;

[0020] A cylinder that houses the roller;

[0021] A bearing plate that encloses the cylinder and supports the shaft.

[0022] The bearing plate has an oil supply channel, one end of which faces the lubricating oil and the other end is connected to the cylinder.

[0023] According to this invention, an oil supply passage, with one end facing the lubricating oil and the other end communicating with the cylinder of the rotary compression mechanism, is provided on the bearing plate. This allows lubricating oil to be supplied to the rotary compression mechanism (e.g., inside the cylinder) through the pressure difference between the inside and outside of the cylinder. Therefore, over-lubrication of the lubricating oil supplied to the rotary compression mechanism can be avoided.

[0024] Furthermore, according to this invention, since lubricating oil is supplied to the rotary compression mechanism via the oil supply channel provided on the bearing plate, it is not necessary to provide a separate oil supply channel inside the shaft. Therefore, even if the shaft is made smaller in diameter, the strength of the shaft can be sufficiently ensured.

[0025] Furthermore, in the rotary compressor of the present invention, ideally,

[0026] The opening and closing of the oil supply channel is switched according to the rotation angle of the shaft.

[0027] According to this invention, by aligning the oil supply channel with the sliding area of ​​the eccentric rotating element (roller, thrust receiving part, etc.) and the bearing plate mounted on the eccentric part (e.g., the area where the lower end face of the roller and the upper end face of the bearing plate overlap during the roller's operation), the opening and closing of the oil supply channel can be switched according to the shaft's rotation angle. That is, with this simple structure, the amount of oil supplied to the rotary compression mechanism can be controlled.

[0028] Furthermore, in the rotary compressor of the present invention, ideally,

[0029] The bearing plate is provided with a plurality of oil supply channels, and,

[0030] Depending on the rotation angle of the shaft, at least one of the plurality of oil supply channels and the other oil supply channels are opened at different time intervals.

[0031] According to this invention, by providing multiple oil supply channels in the sliding areas of the eccentric rotating element and the bearing plate, at least one oil supply channel and the other oil supply channels open at different time intervals depending on the rotation angle of the shaft. This allows for a continuous supply of lubricating oil to the rotary compression mechanism.

[0032] Furthermore, in the rotary compressor of the present invention, it is also possible that...

[0033] The shaft has an internal oil supply structure, which includes an oil supply channel extending along the length direction inside the shaft.

[0034] Invention Effects

[0035] According to the present invention, a rotary compressor can be provided that avoids excessive lubrication of the lubricating oil supplied to the rotary compression mechanism, and in addition, strength can be ensured even if the shaft diameter is reduced. Attached Figure Description

[0036] Figure 1 This is a vertical sectional view of the rotary compressor of this embodiment.

[0037] Figure 2 This is a partial cross-sectional view of the rotary compression mechanism of this embodiment (using...). Figure 1 (Partial cross-sectional view cut off by line AA).

[0038] Figure 3 This is a timing diagram showing the shift in the oil supply volume in this embodiment.

[0039] Explanation of reference numerals in the attached figures

[0040] 1: Rotary compressor;

[0041] 10: Electric components;

[0042] 11: Stator;

[0043] 12: Rotor;

[0044] 13: The rotor shaft;

[0045] 20: Rotary compression mechanism;

[0046] 21: Cylinder;

[0047] 211: Compression chamber;

[0048] 22: Eccentric part;

[0049] 23: Roller;

[0050] 24: Thrust receiver;

[0051] 25: Main framework;

[0052] 26: Bearing plate;

[0053] 263: Oil supply channel;

[0054] 30: Sealed container;

[0055] 40: Lubricating oil. Detailed Implementation

[0056] Hereinafter, a rotary compressor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, referring to... Figure 1 The overall structure of the rotary compressor 1 according to one embodiment of the present invention will be described here. Figure 1 This is a vertical sectional view of rotary compressor 1.

[0057] like Figure 1 As shown, the rotary compressor 1 of this embodiment includes an electric motor 10 and a rotary compression mechanism 20 driven by the electric motor 10. The electric motor 10 and the rotary compression mechanism 20 are housed in a sealed steel container 30, which includes a container body 31 and a cover 32.

[0058] The electric motor 10 is disposed on one side (the upper side in the height direction) inside the sealed container 30, and the rotary compression mechanism 20 is disposed on the other side (the lower side in the height direction) inside the sealed container 30.

[0059] The electric motor 10 is a brushless DC motor comprising a stator 11, a rotor 12, and a shaft 13 (a crankshaft corresponding to the rotation axis of the rotor 12). Here, the stator 11 comprises a stacked body (stator core) 11a formed by stacking multiple electromagnetic steel plates with a generally cylindrical space region on the inside in a donut shape in the vertical direction, and a stator coil 11b wound in a concentrated manner around the teeth of the stacked body 11a.

[0060] The stator coil 11b is electrically connected to a terminal 33 mounted on the cover 32 of the container 30. When power is supplied to the stator coil 11b from the terminal 33, current flows through the stator coil 11b. This generates a rotating magnetic field acting on the rotor 12, causing the rotor 12 to rotate.

[0061] The rotor 12 includes a stacked body (rotor core) 12a formed by stacking multiple electromagnetic steel plates that are approximately circular in plan view along the height direction, and a permanent magnet disposed within the stacked body 12a. The stacked body 12a of the rotor 12 is disposed within a cylindrical spatial region formed inside the stator 11. At this time, a small gap is formed between the inner end of the teeth of the stator 11 and the outer surface of the rotor 12. Furthermore, a through hole 12b extending through the height direction is formed in the center of the rotor 12. The shaft 13 is inserted into the through hole 12b and supports the rotor 12.

[0062] Next, as Figure 1 As shown, the rotary compression mechanism 20 includes a cylinder 21, an eccentric part 22, a roller 23, and a thrust receiving part 24. Here, as... Figure 1 As shown, the cylinder 21 has a compression chamber 211 that extends vertically through it. Furthermore, a main frame 25 supporting the shaft 13 and a bearing plate 26 are mounted on each of the upper and lower surfaces of the cylinder 21. The opening of the cylinder 21 (compression chamber 211) is closed by the main frame 25 and the bearing plate 26.

[0063] In addition, such as Figure 1 As shown, the eccentric portion 22 is housed within the compression chamber 211 and is integrally formed with the shaft 13. Furthermore, the roller 23 is circumferentially disposed on the outer surface of the eccentric portion 22. Additionally, blades (not shown) are slidably disposed within a longitudinal groove (blade groove) formed in the cylinder 21 and face the compression chamber 211. At this time, the inner end of the blade abuts against the outer surface of the roller 23. Thus, the compression chamber 211 is divided into a low-pressure chamber and a high-pressure chamber. Furthermore, a coil spring (not shown) is disposed outside the longitudinal groove, applying force to the outer end of the blade.

[0064] In the rotary compression mechanism 20 of the structure, when the shaft 13 rotates, the eccentric portion 22 and the roller 23 rotate eccentrically within the compression chamber 211. At this time, the roller 23 rotates eccentrically along the inner side of the compression chamber 211. Furthermore, as the roller 23 rotates eccentrically, the blades that abut against the outer side of the roller 23 are pressed into the outer side of the cylinder 21. If the roller 23 continues to rotate eccentrically, the blades slide in the opposite direction to their previous position, returning to their original position.

[0065] Furthermore, the rotary compression mechanism 20 shown in the figure is a rotary compression mechanism with one cylinder 21, but the number of cylinders is not limited to this. That is, the rotary compression mechanism 20 can also be a rotary compression mechanism with two or more cylinders 21.

[0066] Furthermore, in the oil sump formed in the lowest part (the other end) of the sealed container 30, for example, lubricating oil 40 is stored for lubricating the rotary compression mechanism 20 (the sliding areas of cylinder 21 and roller 23, roller 23 and main frame 25, the sliding areas of bearing plate 26, etc.).

[0067] Next, as Figure 1 As shown, the bearing plate 26 of the opening on the other side (in this embodiment, the lower side in the height direction) of the closed cylinder 21 (compression chamber 211) includes a flange portion 261 that abuts against the cylinder 21 and protrudes in the width direction, and a bearing portion 262 that extends downward from the flange portion 261 and supports the shaft 13. In addition, a through channel 263 (263a, 263b) is formed in the bearing portion 262 along the height direction.

[0068] Furthermore, one end of the through channel 263 faces the lubricating oil 40, and the other end of the through channel 263 communicates with the cylinder 21 (inner diameter side of roller 23). Here, the pressure in the low-pressure section of the cylinder 21 (compression chamber 211) is lower than the lubricating oil pressure (cylinder external pressure). At this time, the pressure on the inner diameter side of roller 23 also decreases, passing through the space formed in the uppermost part of roller 23, for example, in the height direction, connecting the cylinder 21 (compression chamber 211) and roller 23. As a result, the lubricating oil 40 drawn into the inner diameter side of roller 23 via the through channel 263 is drawn into the cylinder 21 (inner diameter side of roller 23) and the sliding part. That is, the through channel 263 functions as a channel for supplying lubricating oil into the cylinder 21. Therefore, the through channel will be referred to as the "oil supply channel" below.

[0069] According to this embodiment, since an oil supply channel 263 is provided in the bearing plate 26, it is not necessary to provide an oil supply channel in the shaft 13 as in conventional oil supply mechanisms. Therefore, even if the shaft 13 is made smaller, sufficient strength can be ensured. In addition, since the lubricating oil 40 is drawn in by the pressure difference between the inside and outside of the cylinder 21, over-lubrication of the lubricating oil 40 supplied to the rotary compression mechanism section 20 (cylinder 21) can be avoided.

[0070] Furthermore, in this embodiment, the oil supply channel 263 is provided in the bearing portion 262 of the bearing plate 26; for example, it may also be provided in a location other than the bearing plate 26, like the flange portion 261. Additionally, in Figure 1 Two oil supply channels 263a and 263b are shown, but the number of oil supply channels 263 is not limited to this. As mentioned above, the number of oil supply channels 263 is basically multiple, but it can also be optimized to a single one.

[0071] Next, refer to Figure 2 and Figure 3 The operation of the rotary compressor 1 in this embodiment will be explained. Here, Figure 2 This is a partial sectional view of the rotary compression mechanism 20 (using...). Figure 1 The partial sectional view (cut off along line AA) illustrates the positional relationship between the eccentric rotating elements (roller 23, thrust receiving section 24, etc.) and the oil supply channel 263 in the rotary compression mechanism section 20, based on the rotation angle (crank angle) of shaft 13. Additionally, Figure 3This is a timing diagram showing the shift in the oil supply volume in this embodiment.

[0072] like Figure 2 As shown, when the rotation angle of shaft 13 is 0°, one side of oil supply channel 263 (oil supply channel 263a) overlaps with the lower end of roller 23. Thus, oil supply channel 263a is closed. Conversely, the other side of oil supply channel 263 (oil supply channel 263b) does not overlap with roller 23, and is thus open.

[0073] Next, when roller 23 rotates to a rotation angle of 90° with shaft 13, oil supply channels 263a and 263b overlap and close with the lower end of roller 23. Furthermore, when roller 23 rotates to a rotation angle of 135° with shaft 13, the previously closed oil supply channel 263a opens. Furthermore, when roller 23 rotates to a rotation angle of 270° with shaft 13, oil supply channels 263a and 263b again overlap and close with the lower end of roller 23. Furthermore, when roller 23 rotates to a rotation angle of 360° (0°) with shaft 13, oil supply channel 263a closes, while oil supply channel 263b opens.

[0074] The change in oil supply based on the opening and closing actions of oil supply channels 263a and 263b is as follows: Figure 3 As shown. That is, the rotation angle of axis 13 is 0° to 90° ( Figure 3 During period A), lubricating oil 40 is supplied from oil supply channel 263b to cylinder 21 (inner diameter side of roller 23) (the amount of oil supplied from oil supply channel 263b is indicated by a single-dotted line). At this time, lubricating oil 40 is not supplied from oil supply channel 263a (the amount of oil supplied from oil supply channel 263b is indicated by a dashed line).

[0075] In contrast, the rotation angle of axis 13 is 90° to 270°. Figure 3 During period B), lubricating oil 40 is supplied to cylinder 21 (inner diameter side of roller 23) from oil supply channel 263a, while lubricating oil 40 is not supplied from oil supply channel 263b. Finally, the rotation angle of shaft 13 is 90° to 270°. Figure 3 During period C), lubricating oil 40 is supplied to cylinder 21 (inner diameter side of roller 23) again from oil supply channel 263b, while lubricating oil 40 is not supplied from oil supply channel 263a.

[0076] Thus, by positioning the oil supply channel 263 towards the sliding area of ​​the eccentric rotating element (in this embodiment, roller 23) and bearing plate 26 of the rotary compression mechanism 20, the oil supply channels 263a and 263b open and close at different times depending on the rotation angle of the eccentric rotating element. Therefore, as... Figure 3As shown, the periods during which oil supply passage 263a is open and oil supply passage 263b is open are alternately switched. As a result, lubricating oil 40 can be continuously supplied to the rotary compression mechanism 20 (cylinder 21).

[0077] Furthermore, in this embodiment, oil supply channels 263a and 263b are provided in the sliding area between the roller 23 and the bearing plate 26, but the positions of the oil supply channels 263a and 263b are not limited thereto. For example, the oil supply channels 263a and 263b can perform the same function even if they are located in the sliding area between the thrust receiving part 24 and the bearing plate 26.

[0078] Additionally, within the range that ensures the rigidity of shaft 13, an oil supply structure (a central hole (oil supply channel) extending along the length direction within shaft 13, or a structure with blades added as appropriate; referred to as an "in-shaft oil supply structure") may also be provided within shaft 13. This in-shaft oil supply structure and oil supply channel 263 can also be combined to further optimize the oil supply volume.

[0079] Furthermore, the case with two oil supply channels 263 has been described. However, when there is only one oil supply channel 263, the opening and closing periods (oil supply period and non-oil supply period) of the oil supply channel 263 are switched according to the rotation angle of the shaft 13. Thus, by providing the oil supply channel 263 in the sliding area of ​​the eccentric rotating element (roller 23, thrust receiving part 24, etc.) and the bearing plate 26, the amount of oil supplied to the rotary compression mechanism 20 can be controlled.

[0080] Embodiments of the present invention have been described in detail. However, the above description is for the purpose of making the present invention readily understandable and is not intended to limit the scope of the invention. The present invention may include modifications and improvements to the above embodiments without departing from its spirit. Furthermore, the present invention includes equivalents thereof.

[0081] Industrial availability

[0082] The rotary compressor of the present invention is used, for example, in household and commercial air conditioning units. However, its applications are not limited thereto.

Claims

1. A rotary compressor, characterized in that, have: Sealed container; An electric motor is disposed on one side inside the sealed container; A rotary compression mechanism is disposed on the other side inside the sealed container; A shaft connecting the electric motor and the rotary compression mechanism; Lubricating oil, wherein the lubricating oil is stored in the sealed container. The rotary compression mechanism includes: The roller rotates eccentrically as the shaft rotates; A cylinder that houses the roller; A bearing plate that encloses the cylinder and supports the shaft. The bearing plate has an oil supply channel, one end of which faces the lubricating oil and the other end is connected to the cylinder; the oil supply channel is arranged along the height direction of the rotary compressor, and the oil supply channel is opened and closed by the roller; The opening and closing of the oil supply channel is switched according to the rotation angle of the shaft; The bearing plate is provided with a plurality of oil supply channels, and Depending on the rotation angle of the shaft, at least one of the plurality of oil supply channels and the other oil supply channels are opened at different time intervals, enabling a continuous supply of lubricating oil to the rotary compression mechanism.

2. The rotary compressor according to claim 1, wherein, The shaft has an internal oil supply structure, which includes an oil supply channel extending along the length direction inside the shaft.

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