Scroll compressor

Abstract

A scroll compressor 1 includes a first cover 40 fixed to a fixed scroll 22, and a second cover 50 fixed to the first cover 40. The first cover 40 includes a first top plate 42 and a first peripheral wall 44, and forms a first space 46 inside. The second cover 50 includes a second top plate 52 and a second peripheral wall 54, and forms a second space 56 inside. The first space 46 is connected to a discharge port 24 passing through the fixed scroll 22. A plurality of through holes 60a, 60b, 60c, 60d, 60e, 60f, 60g are formed through the first top plate 42 so that the through holes 60a, 60b, 60c, 60d, 60e, 60f, 60g having different diameters connect the first space 46 with the second space 56.

Description

Technical Field

[0001] This invention relates to scroll compressors. Background Technology

[0002] It is known that a scroll compressor includes a first cover fixed to a fixed scroll member and having a first space inside, and a second cover fixed to the first cover and having a second space, such that a through hole is formed to pass through the first cover, as disclosed in Japanese Unexamined Patent Application Publication No. 2018-53746A, referred to below as PTL1.

[0003] In PTL1, the refrigerant flows periodically from the compression mechanism into the first space, causing discharge pulsations as pressure fluctuations in the first space. These discharge pulsations can cause vibrations in the compressor and may result in noise generated by the compressor. Furthermore, noise and vibration can occur due to the mechanical moving parts within the compressor.

[0004] Furthermore, if the compressor's rotational speed can be changed, there is a possibility that noise and vibration will not be reduced.

[0005] Therefore, there is a need to develop scroll compressors that can effectively reduce noise and vibration caused by emission pulsation and mechanical moving parts with a simple configuration.

[0006] Citation List

[0007] PTL1: Japanese Unexamined Patent Application Publication No. 2018-53746A Summary of the Invention

[0008] The purpose of this invention is to provide a scroll compressor that can effectively reduce noise and vibration caused by discharge pulsation and mechanical moving parts with a simple configuration.

[0009] To achieve the above objectives, embodiments of the present invention provide a scroll compressor comprising: a first cover fixed to a fixed scroll member; and a second cover fixed to the first cover, wherein the first cover includes a first top plate and a first peripheral wall extending downward from the entire circumference of the edge of the first top plate, the first cover being configured to form a first space internally, wherein the second cover includes a second top plate and a second peripheral wall, the second peripheral wall extending downward from the entire circumference of the edge of the second top plate such that the entire lower end of the second peripheral wall is connected to the first top plate, the second cover being configured to form a second space internally, wherein the first space is connected to a discharge port through the fixed scroll member and allows refrigerant to flow, and wherein a plurality of through holes are formed through the first top plate of the first cover such that through holes of different diameters connect the first space and the second space.

[0010] According to an embodiment of the present invention, since the configuration surrounded by the first cover and the second cover includes a second space that communicates only with the first space and a plurality of through holes that communicate between the first space and the second space, the configuration surrounded by the first cover and the second cover forms a Helmholtz type resonance chamber that communicates with the first space.

[0011] In a configuration that serves as a Helmholtz-type resonant chamber, surrounded by a first and a second cover, the gas inside the second space acts as a spring, and the gas inside the through-hole vibrates rigidly to resonate with sound at a specific frequency. By generating frictional energy between the vibrating gas inside the through-hole and the inner wall of the through-hole, the acoustic energy caused by emission pulsations and the vibrational energy caused by mechanical moving parts are reduced.

[0012] Therefore, noise and vibration caused by emission pulsations and mechanical moving parts can be reduced.

[0013] Furthermore, since multiple through holes are formed as the first top plate passing through the first cover, the through holes with different diameters connect the first space and the second space, thus forming a Helmholtz-type resonant chamber with a simple configuration that resonates at different specific frequencies.

[0014] Therefore, scroll compressors can effectively reduce noise and vibration caused by discharge pulsation and mechanical moving parts with a simple configuration. Attached Figure Description

[0015] The principles and advantages of the invention will become apparent in the following description taking into consideration the accompanying drawings, in which:

[0016] Figure 1 This is an explanatory diagram illustrating a schematic configuration of a scroll compressor 1 including a first cover 40 and a second cover 50 according to an embodiment of the present invention.

[0017] Figure 2A It is fixed when viewed from an obliquely upward position. Figure 1 The first cover 40 on the fixed vortex component 22 and fixed in Figure 1 A three-dimensional view of the second cover 50 on the first cover 40 in the middle;

[0018] Figure 2B When viewed from a diagonal downward angle Figure 1 A perspective view of the first cover 40 and the second cover 50 in the middle;

[0019] Figure 3 It is along Figure 2A A cross-sectional view taken from line III-III;

[0020] Figure 4 It is along Figure 3A cross-sectional view taken from line IV-IV; and

[0021] Figure 5 It is along Figure 3 A cross-sectional view of line VV. Detailed Implementation

[0022] In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0023] Figure 1 This is an explanatory diagram illustrating a schematic configuration of a scroll compressor 1 according to an embodiment. The scroll compressor 1 is a fluid machine configured to compress and discharge fluid (i.e., gaseous refrigerant) and can be a component of a refrigeration cycle device. The scroll compressor 1 according to the embodiment is a vertically mounted shell-type compressor.

[0024] like Figure 1 As shown, the scroll compressor 1 includes: a sealed container 10; a suction pipe 12 that is installed through to the top surface of the sealed container 10 and is formed as a hollow cylindrical tube; a discharge pipe 14 that discharges gaseous refrigerant to the outside; a scroll compression mechanism 20 configured to compress low-pressure gaseous refrigerant in a compression chamber 28; and a motor element 30 configured to drive the compression mechanism 20 housed in the sealed container 10.

[0025] The upper portion of the compression mechanism 20 is supported by the intermediate housing 10a of the sealed container 10. The compression mechanism 20 is fixed to the intermediate housing 10a of the sealed container 10 by a shrink fitting or other methods. A sub-frame 16 is provided below the motor element 30. The sub-frame 16 is fixed to the inner circumferential surface of the sealed container 10. An oil groove 18 is formed on the bottom of the sealed container 10. Refrigerant oil that lubricates sliding parts such as bearings accumulates in the oil groove 18.

[0026] A suction pipe 12, configured to draw low-pressure gaseous refrigerant from the outside into the compression mechanism 20, is connected to the side surface of the sealed container 10. A discharge pipe 14, configured to discharge high-pressure gaseous refrigerant to the outside of the scroll compressor 1, is connected to the side of the sealed container 10.

[0027] The compression mechanism 20 is housed in the sealed container 10 and configured to compress the refrigerant drawn in from the suction pipe 12 by rotation of the crankshaft 36, which is rotated by means of the motor element 30. Figure 1 As shown, the compression mechanism 20 includes a fixed scroll member 22 and a moving scroll member 26.

[0028] The fixed scroll member 22 is fixed to the intermediate housing 10a at its lower end portion. For example... Figure 1As shown, the fixed scroll member 22 includes a fixed scroll member base plate 22a and a fixed scroll member spiral scroll 22b. The fixed scroll member spiral scroll 22b has an involute shape to form a spiral body, and the fixed scroll member spiral scroll 22b stands upright on one surface of the fixed scroll member base plate 22a. A discharge port 24 configured to discharge compressed refrigerant is formed in the central portion of the fixed scroll member 22.

[0029] The moving scroll member 26 is configured to revolve relative to the stationary scroll member 22 without rotation via an Oldham mechanism (not shown). Figure 1 As shown, the moving scroll member 26 includes a moving scroll member base plate 26a and a moving scroll member helical scroll 26b. The moving scroll member helical scroll 26b has an involute shape to form a helical body, and the moving scroll member helical scroll 26b stands upright on one surface of the moving scroll member base plate 26a. A rotating bearing 26c, formed in a bottomed cylindrical shape, is formed in approximately the central portion of the lower surface of the moving scroll member base plate 26a. An eccentric shaft portion 36b, mounted on the upper end of the main shaft portion 36a (described later), is inserted into the rotating bearing 26c to cause the moving scroll member 26 to rotate.

[0030] The moving scroll member helical scroll 26b is configured to engage with the fixed scroll member helical scroll 22b to form a compression chamber 28 between the fixed scroll member helical scroll 22b and the moving scroll member helical scroll 26b. The moving scroll member 26b is configured to revolve relative to the fixed scroll member 22.

[0031] like Figure 1 , Figure 2A and Figure 3 As shown, the first cover 40, which has a second cover 50, is fixed to the top portion of the fixed vortex member 22 by bolts 49.

[0032] The first cover 40 includes a first top plate 42, a first outer peripheral wall 44 extending downward from the entire circumference of the edge of the first top plate 42, and a bottom portion 48 for securing the first cover 40 to the fixed vortex member 22. The first cover 40 is formed in a cap shape to appear circular when viewed from above.

[0033] The first cover 40 is configured to form a first space 46 internally. That is, the first space 46 is the space surrounded by the first top plate 42, the first outer wall 44, and the top portion of the fixed scroll member 22. The first space 46 is connected to the discharge port 24 through the fixed scroll member 22 and allows the flow of compressed refrigerant.

[0034] like Figure 2A , Figure 2B and Figure 3As shown, the first top plate 42 of the first cover 40 includes a plurality of extensions 42a that, when viewed from above, extend outward beyond the top portion of the fixed scroll member 22, thereby forming a gap 62 between each portion of the lower end 44a of the first peripheral wall 44 and the top portion of the fixed scroll member. Each extension 42a is configured to widen in the outward direction.

[0035] When viewed from above, the bottom portion 48 with an opening 48a is positioned between two extension portions 42a, through which bolts 49 pass to secure the first cover 40 to the fixed vortex member 22.

[0036] like Figure 2B , Figure 3 and Figure 5 As shown, the first space 46 includes a plurality of chambers, each of which is surrounded by an extension 42a of a first top plate 42, a first peripheral wall 44 extending downward from the extension 42a, two bottom portions 48, and a top portion of a fixed vortex member 22.

[0037] The second cover 50, fixed to the first cover 40, includes a second top plate 52 and a second peripheral wall 54. The second peripheral wall 54 extends downward from the entire circumference of the edge of the second top plate 52, such that its entire lower end 54a is connected to the first top plate 42. The second cover 50 is configured to form a second space 56 internally. Figure 2A and Figure 4 As shown, the second cover 50 is circular when viewed from above, and the second cover 50 is also bowl-shaped.

[0038] like Figure 3 and Figure 4 As shown, the second space 56 is formed as a chamber surrounded by a second top plate 52, a second outer perimeter wall 54 extending downward from the second top plate 52, and a first cover 40.

[0039] like Figure 2B , Figure 3 and Figure 4 As shown, in the first top plate 42 of the first cover 40, a plurality of through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g are formed to pass through the first top plate 42 of the first cover 40, such that the through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g with different diameters connect the first space 46 and the second space 56.

[0040] The diameters of through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g are formed in the order of increasing diameter. Additionally, some of the through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g may be formed to have the same diameter.

[0041] In this embodiment, through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g are formed in the central portion of the first cover 40. Additionally, to reduce the impact of compressed refrigerant discharged from the discharge port 24, multiple through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g may be provided along the peripheral edge portion of the first top plate 42 of the first cover 40.

[0042] In one embodiment, the through-hole 60a of the first cover 40, formed in the direction in which the compressed refrigerant is discharged from the discharge port 24 into the first space 46, is configured such that the diameter of the through-hole 60a is smaller than the diameters of the other through-holes 60b, 60c, 60d, 60e, 60f, and 60g. This prevents turbulence of the compressed refrigerant discharged from the discharge port 24 and thus reduces noise and vibration.

[0043] The motor element 30 includes an electric motor stator 32 fixed to the inner peripheral surface of the sealed container 10 by a shrink fit or other method, an electric motor rotor 34 rotatably housed on the inner peripheral side of the electric motor stator 32, and a crankshaft 36 (main shaft portion 36a) fixed to the electric motor rotor 34 by a shrink fit or other method. The electric motor rotor 34 is configured to rotate when electricity is supplied to the electric motor stator 32 and transmit driving force to the moving scroll member 26 via the crankshaft 36.

[0044] The eccentric shaft portion 36b of the crankshaft 36, located above the electric motor rotor 34, is rotatably supported in the radial direction by a cylindrical rotating bearing 26c mounted below the moving scroll plate 26a. The main shaft portion 36a is fitted in the main bearing 39 and slides along the main bearing 39 by a film of lubricating oil. The eccentric shaft portion 36b, eccentric to the main shaft portion 36a, is mounted on the upper end of the crankshaft 36.

[0045] A pump element 19, such as a positive displacement pump, is mounted at the lower end of the crankshaft 36. The pump element 19 supplies refrigerant oil accumulated in the oil sump 18 to sliding components such as the main bearing 39. The pump element 19 is mounted on the subframe 16 and the crankshaft 36 is axially supported on the upper end surface of the pump element 19.

[0046] Next, refer to Figures 1 to 5 Describe in detail the operation of the first cover 40 and the second cover 50. Figure 3 and Figure 5 The arrow "A" in the diagram indicates the flow of compressed refrigerant.

[0047] First, when compressor 1 is running, compressed refrigerant is discharged from discharge port 24 into first space 46. The compressed refrigerant discharged from discharge port 24 into first space 46 flows in first space 46 in the direction of discharge from discharge port 24 into first space 46.

[0048] In the embodiment, since the through hole 60a of the first cover 40 formed in the direction of the compressed refrigerant being discharged from the discharge port 24 to the first space 46 is formed such that the diameter of the through hole 60a is smaller than the diameter of the other through holes 60b, 60c, 60d, 60e, 60f, 60g, turbulence of the compressed refrigerant discharged from the discharge port 24 can be prevented and noise and vibration can be reduced.

[0049] Furthermore, since the configuration surrounded by the first cover 40 and the second cover 50 includes a second space 56 that communicates only with the first space 46 and multiple through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g that communicate between the first space 46 and the second space 56, the configuration surrounded by the first cover 40 and the second cover 50 forms a Helmholtz-type resonant chamber that communicates with the first space 46. Therefore, noise and vibration caused by emission pulsations and mechanical moving parts can be reduced.

[0050] Furthermore, since multiple through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g are formed to pass through the first top plate 42 of the first cover 40, the through holes 60a, 60b, 60c, 60d, 60e, 60f, and 60g with different diameters connect the first space 46 and the second space 56, thus forming a Helmholtz-type resonant chamber with a simple configuration that resonates at different specific frequencies.

[0051] Secondly, the compressed refrigerant reaches the first top plate 42, and the compressed refrigerant flows toward the first outer wall 44 by changing the flow direction of the compressed refrigerant.

[0052] The first space 46 includes multiple chambers, each of which is surrounded by an extension 42a of a first top plate 42, a first peripheral wall 44 extending downward from the extension 42a, two bottom portions 48, and a top portion of a fixed vortex member 22. Therefore, the multiple chambers in the first space 46 serve as refrigerant flow paths from the central portion of the first space 46 to the peripheral edge portions of the first space 46.

[0053] Furthermore, each of the plurality of extensions 42a is formed to extend outward beyond the top portion of the fixed scroll member 22 when viewed from above, thereby forming a gap 62 between each portion of the lower end 44a of the first peripheral wall 44 and the top portion of the fixed scroll member 22. Therefore, compressed refrigerant flowing within the refrigerant flow path surrounded by the extensions 42a of the first top plate 42, the first peripheral wall 44, and the two bottom portions 48 can be discharged to the outside of the first space 46.

[0054] As a result, since the first top plate 42 includes multiple extensions 42a and the first space 46 includes multiple chambers, the compressed refrigerant can be smoothly discharged to the outside of the first space 46 while preventing turbulence.

[0055] Therefore, according to the implementation, the scroll compressor 1 can effectively reduce noise and vibration caused by discharge pulsation and mechanical moving parts with a simple configuration.

[0056] Although specific embodiments of the invention have been disclosed, described, and illustrated in the accompanying drawings, this is merely for a better understanding of the principles of the invention and not intended to limit the scope and spirit of the invention. Various adaptations and modifications to the design or materials, mounting mechanisms, or implementations of the various components and elements of the invention will be possible and apparent to those skilled in the art without departing from the scope of the invention as defined by the claims.

[0057] The attached diagram is labeled as follows:

[0058] 1: Scroll compressor

[0059] 10: Sealed container

[0060] 10a: Intermediate shell

[0061] 12: Inhalation tube

[0062] 14: Discharge pipe

[0063] 16: Subframe

[0064] 18: Oil tank

[0065] 19: Pump Components

[0066] 20: Compression mechanism

[0067] 22: Fixed vortex component

[0068] 22a: Fixed vortex substrate

[0069] 22b: Fixed vortex component spiral vortex

[0070] 24: Emission Port

[0071] 26: Moving scroll component

[0072] 26a: Moving scroll component substrate

[0073] 26b: Moving scroll component, spiral scroll

[0074] 26c: Rotating bearing

[0075] 28: Compression Chamber

[0076] 30: Motor components

[0077] 32: Electric motor stator

[0078] 34: Electric motor rotor

[0079] 36: Crankshaft

[0080] 36a: Spindle section

[0081] 36b: Eccentric shaft section

[0082] 39: Main bearing

[0083] 40: First Cover

[0084] 42: First Top Plate

[0085] 42a: Extension

[0086] 44: First outer perimeter wall

[0087] 44a: Lower end of the first outer perimeter wall

[0088] 46: First Space

[0089] 48: Bottom section

[0090] 48a: Opening

[0091] 49: Bolt

[0092] 50: Second cover

[0093] 52: Second Top Plate

[0094] 54: Second outer perimeter wall

[0095] 54a: Lower end of the second outer perimeter wall

[0096] 56: Second Space

[0097] 60, 60a, 60b, 60c, 60d, 603e, 60f, 60g: Through holes

[0098] 62: Gap

[0099] A: The flow of compressed refrigerant

Claims

1. A scroll compressor (1), the scroll compressor (1) comprising: The first cover (40) is fixed on the fixed vortex component (22); as well as The second cover (50) is fixed to the first cover (40). The first cover (40) includes a first top plate (42) and a first peripheral wall (44) extending downward from the edge of the first top plate (42) over the entire circumference, the first cover (40) being configured to form a first space (46) inside. The first top plate (42) of the first cover (40) includes a plurality of extension portions (42a) which, when viewed from above, extend outward beyond the top portion of the fixed vortex member (22), thereby forming a gap (62) between each portion of the lower end (44a) of the first peripheral wall (44) and the top portion of the fixed vortex member (22). The second cover (50) includes a second top plate (52) and a second peripheral wall (54), the second peripheral wall (54) extending downward from the entire circumference of the edge of the second top plate (52) such that the entire lower end (54a) of the second peripheral wall (54) is connected to the first top plate (42), and the second cover (50) is configured to form a second space (56) inside. The first space (46) is connected to the discharge port (24) passing through the fixed vortex member (22) and allows the refrigerant to flow. The first top plate (42) passing through the first cover (40) has a plurality of through holes (60a, 60b, 60c, 60d, 60e, 60f, 60g) so that the through holes (60a, 60b, 60c, 60d, 60e, 60f, 60g) with different diameters connect the first space (46) with the second space (56).

2. A scroll compressor (1), the scroll compressor (1) comprising: The first cover (40) is fixed on the fixed vortex component (22); as well as The second cover (50) is fixed to the first cover (40). The first cover (40) includes a first top plate (42) and a first peripheral wall (44) extending downward from the edge of the first top plate (42) over the entire circumference, the first cover (40) being configured to form a first space (46) inside. The first top plate (42) of the first cover (40) includes a plurality of extension portions (42a) which, when viewed from above, extend outward beyond the top portion of the fixed vortex member (22), thereby forming a gap (62) between each portion of the lower end (44a) of the first peripheral wall (44) and the top portion of the fixed vortex member (22). The second cover (50) includes a second top plate (52) and a second peripheral wall (54), the second peripheral wall (54) extending downward from the entire circumference of the edge of the second top plate (52) such that the entire lower end (54a) of the second peripheral wall (54) is connected to the first top plate (42), and the second cover (50) is configured to form a second space (56) inside. The first space (46) is connected to the discharge port (24) passing through the fixed vortex member (22) and allows the refrigerant to flow. The first top plate (42) passing through the first cover (40) has multiple through holes (60a, 60b, 60c, 60d, 60e, 60f, 60g), such that the through holes (60a, 60b, 60c, 60d, 60e, 60f, 60g) with different diameters connect the first space (46) and the second space (56). Wherein, the through hole (60a) formed in the first cover (40) in the direction in which the compressed refrigerant is discharged from the discharge port (24) to the first space (46) is formed such that the diameter of the through hole (60a) is smaller than the diameter of the other through holes (60b, 60c, 60d, 60e, 60f, 60g).

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