EP4600495A1

EP4600495A1 - Scroll compressor

Info

Publication number: EP4600495A1
Application number: EP23879622.1A
Authority: EP
Inventors: Yoshiaki Miyamoto; Akihiro Noguchi; Syunsuke SETO
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2022-10-20
Filing date: 2023-10-04
Publication date: 2025-08-13
Also published as: WO2024084975A1; EP4600495A4; JP2024060884A

Abstract

Provided is a scroll compressor comprising: a scroll compression mechanism (5); a rear housing (2) which accommodates the scroll compression mechanism (5); and a front housing (3) in which a slidable surface (3Ba) which comes into contact with an end surface (16a) of an orbiting scroll (16) is formed at an end section on the scroll compression mechanism (5) side. In the rear housing (2), a suction port (2b) which introduces a refrigerant gas into an internal space (IS) is formed. At a position where the slidable surface (3Ba) is disposed, an outer edge section (3c) of the front housing (3) in the radial direction RD is disposed with a clearance (CL) between the outer edge section and the inner circumferential surface (2c) of the rear housing (2). The compressor (1) has notch sections (3d) which are notched inward in the radial direction (RD) at a plurality of locations in the circumferential direction around an axis (X) so that the refrigerant gas introduced into the internal space (IS) from the suction port (2b) is guided to the scroll compression mechanism (5) side.

Description

Technical Field

The present disclosure relates to a scroll compressor.

Background Art

In the related art, a scroll compressor having a fixed scroll and an orbiting scroll that meshes with the fixed scroll is known (for example, refer to PTL 1). In PTL 1, a refrigerant containing a lubricant is supplied from a suction opening to a sealed space of a housing accommodating a scroll compression mechanism. The refrigerant supplied to the sealed space is guided to the scroll compression mechanism from a gap between the housing and a front housing that holds a main bearing, and is discharged to an outside from a discharge port after being compressed by the scroll compression mechanism.

Citation List

Patent Literature

[PTL 1] Japanese Unexamined Patent Application Publication No. 2016-156310

Summary of Invention

Technical Problem

However, in PTL 1, the refrigerant passes through a minute gap between the housing and the front housing. Therefore, a pressure loss occurs when the refrigerant passes through the gap, which is a factor that reduces a compression efficiency of a compressor. In addition, in a case where the gap is made large, a device becomes large, and thus it is not possible to realize miniaturization of the device.
The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a scroll compressor capable of improving a compression efficiency by reducing a pressure loss when a refrigerant guided from a suction port to an internal space is guided to a compression portion.

Solution to Problem

A scroll compressor according to an aspect of the present disclosure includes: a compression portion that includes a fixed scroll and an orbiting scroll that meshes with the fixed scroll; a drive shaft that rotates around an axis and that is attached to the orbiting scroll via an eccentric shaft disposed eccentrically relative to the axis; a bearing portion that supports the drive shaft; a first housing that accommodates the compression portion and that has a circular inner peripheral surface having a first radius centered around the axis; a second housing that is attached to close an opening of the first housing and that is provided with a recess for holding the bearing portion on the axis and a sliding surface that comes into contact with an end surface of the orbiting scroll, at an end portion on a compression portion side, in which a suction port that guides a refrigerant compressed by the compression portion to an internal space on a bearing portion side in a direction along the axis relative to the sliding surface is formed in the first housing, the sliding surface has a circular outer shape having a second radius smaller than the first radius centered around the axis, and at a position where the sliding surface is disposed, an outer edge portion of the second housing in a radial direction orthogonal to the axis is disposed with a gap from an inner peripheral surface of the first housing, and has cutout portions formed to be cut out inward in the radial direction at a plurality of locations in a circumferential direction around the axis so as to guide the refrigerant guided from the suction port to the internal space to the compression portion side in the direction along the axis.

Advantageous Effects of Invention

According to the present disclosure, it is possible to provide a scroll compressor capable of improving a compression efficiency by reducing a pressure loss when a refrigerant guided from a suction port to an internal space is guided to a compression portion.

Brief Description of Drawings

Fig. 1 is a longitudinal sectional view showing a schematic configuration of a compressor according to a first embodiment of the present disclosure.
Fig. 2 is a view of a front housing shown in Fig. 1 as viewed from a scroll compression mechanism side, and shows a state where a thrust plate is attached to a main body portion of the front housing.
Fig. 3 is a plan view of the thrust plate shown in Fig. 1.
Fig. 4 is a view of the front housing shown in Fig. 1 as viewed from the scroll compression mechanism side and shows a state where the thrust plate is removed from the main body portion of the front housing.
Fig. 5 is a view of the front housing shown in Fig. 1 as viewed from the scroll compression mechanism side, and shows a state where an end surface of an orbiting scroll is attached to a sliding surface of the front housing.
Fig. 6 is a view of the front housing shown in Fig. 1 as viewed from the scroll compression mechanism side, and shows a state where the end surface of the orbiting scroll is attached to the sliding surface of the front housing.
Fig. 7 is a view of the front housing shown in Fig. 1 as viewed from the scroll compression mechanism side, and shows a state where the end surface of the orbiting scroll is attached to the sliding surface of the front housing.
Fig. 8 is a view of the front housing shown in Fig. 1 as viewed from the scroll compression mechanism side, and shows a state where the end surface of the orbiting scroll is attached to the sliding surface of the front housing.
Fig. 9 is a longitudinal sectional view showing a schematic configuration of a compressor according to a second embodiment of the present disclosure.
Fig. 10 is a view of a front housing shown in Fig. 9 as viewed from a scroll compression mechanism side, and shows a state where a thrust plate is attached to a main body portion of the front housing.

Description of Embodiments

[First Embodiment]

Hereinafter, an open-type scroll compressor (hereinafter, referred to as a compressor) 1 according to a first embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view showing a schematic configuration of the compressor 1 according to the first embodiment of the present disclosure. Fig. 1 is a sectional view taken along line A-A of the compressor 1 shown in Fig. 2, which will be described later. White arrows shown in Fig. 1 indicate an example of a circulation path of a refrigerant gas.
As shown in Fig. 1, the compressor 1 of the present embodiment includes a rear housing 2 (first housing) that is formed in a cylindrical shape along a circumferential direction around an axis X, and a front housing 3 (second housing) that is attached to close an opening 2a provided on a front end side of the rear housing 2.
In addition, the compressor 1 of the present embodiment includes a scroll compression mechanism (compression portion) 5, a drive shaft 6, a main bearing (bearing portion) 7, a sub-bearing 8, a lip seal 9, a bearing 10, an electromagnetic clutch 11, a crank pin (eccentric shaft) 13, a drive bush 14, a fixed scroll 15, an orbiting scroll 16, a balance weight 30, and an Oldham link 31.
The rear housing 2 has a shape in which a rear end side is closed, and the front housing 3 is fixed to the opening 2a on the front end side by bolts (not shown). An internal space IS is formed inside the rear housing 2 in a state where the front housing 3 is fixed to the rear housing 2, and the scroll compression mechanism 5 and the drive shaft 6 are accommodated in the internal space IS.
A suction port 2b through which the refrigerant gas flows into the internal space IS and a discharge port (not shown) through which the refrigerant gas compressed by the scroll compression mechanism 5 is discharged from the internal space IS to an outside are formed in an outer peripheral surface of the rear housing 2. The suction port 2b guides the refrigerant gas to the internal space IS on a main bearing 7 side in a direction along the axis X with respect to a sliding surface 3Ba of a thrust plate 3B, which will be described later.
The front housing 3 is a substantially cylindrical member in which a recess 3a for holding the main bearing 7 on the axis X and a recess 3b for holding the sub-bearing 8 on the axis X are formed inside and which is open on a rear housing 2 side. The recess 3a is formed at an end portion on a scroll compression mechanism 5 side.
In addition, the front housing 3 has a main body portion 3A in which the recess 3a and the recess 3b are formed, and the thrust plate 3B having a plate shape that is attached to an end portion of the main body portion 3A on the scroll compression mechanism 5 side. An annular groove portion 3Aa for accommodating the thrust plate 3B is formed at the end portion of the main body portion 3A on the scroll compression mechanism 5 side.
The thrust plate 3B has the sliding surface 3Ba that comes into contact with an end surface 16a of the orbiting scroll 16, the sliding surface 3Ba being formed at the end portion on the scroll compression mechanism 5 side. The thrust plate 3B is formed of, for example, a metallic material primarily containing iron, and by coating the thrust plate 3B with a fluororesin material (for example, PTFE), the sliding surface 3Ba with high lubricity is formed.
Next, the sliding surface 3Ba formed in the front housing 3 and a cutout portion 3d formed in an outer edge portion 3c of the front housing 3 will be described in detail with reference to Figs. 2 to 4. Fig. 2 is a view of the front housing 3 shown in Fig. 1 as viewed from the scroll compression mechanism 5 side, and shows a state where the thrust plate 3B is attached to the main body portion 3A of the front housing 3. Fig. 3 is a plan view of the thrust plate 3B shown in Fig. 1. Fig. 4 is a view of the front housing 3 shown in Fig. 1 as viewed from the scroll compression mechanism 5 side, and shows a state where the thrust plate 3B is removed from the main body portion 3A of the front housing 3. Figs. 2 and 4 show a state where the scroll compression mechanism 5 and the Oldham link 31 are removed.
As shown in Figs. 1 and 2, at a position in an axis X direction where the sliding surface 3Ba is disposed, the outer edge portion 3c of the sliding surface 3Ba of the front housing 3 in a radial direction RD orthogonal to the axis X is disposed with a gap CL from an inner peripheral surface 2c of the rear housing 2. In addition, at the position in the axis X direction where the sliding surface 3Ba is disposed, the outer edge portion 3c of the sliding surface 3Ba of the front housing 3 in the radial direction RD orthogonal to the axis X has cutout portions 3d cut out inward in the radial direction RD at a plurality of locations (four locations in Fig. 2) in the circumferential direction CD around the axis X so as to guide the refrigerant guided from the suction port 2b to the internal space IS to the scroll compression mechanism 5 side in a direction along the axis X.
As shown in Fig. 3, in the thrust plate 3B, cutout shapes (second cutout shapes) 3Bb that form parts of the cutout portion 3d are formed at a plurality of locations (four locations in Fig. 3) in the circumferential direction CD. As shown in Fig. 4, in the main body portion 3A, cutout shapes (first cutout shapes) 3Ab that form parts of the cutout portion 3d are formed at a plurality of locations (four locations in Fig. 4) in the circumferential direction CD. As shown in Fig. 2, the cutout portion 3d of the front housing 3 is formed by disposing the cutout shape 3Ab formed in the main body portion 3A shown in Fig. 4 and the cutout shape 3Bb formed in the thrust plate 3B shown in Fig. 3 at the same position in the circumferential direction CD.
In Figs. 2 to 4, the cutout portions 3d of the front housing 3 are formed at four locations in the circumferential direction CD, but other aspects may be adopted. For example, the cutout portions 3d of the front housing 3 may be formed at two or more locations in the circumferential direction CD, and are preferably formed at four or more locations.
Here, a positional relationship between the orbiting scroll 16 and the cutout portion 3d of the front housing 3 when the orbiting scroll 16 performs rotational and orbital motion around the axis X will be described with reference to Figs. 5 to 8. Figs. 5 to 8 are views of the front housing 3 shown in Fig. 1 as viewed from the scroll compression mechanism 5 side, and show a state where the end surface of the orbiting scroll 16 is attached to the sliding surface 3Ba of the front housing 3. The orbiting scroll 16 performs rotational and orbital motion in a counterclockwise direction around the axis X in the order of Figs. 5, 6, 7, and 8.
In Fig. 5, a center Co of the orbiting scroll 16 is located above the axis X in the figure. Therefore, on a lower side of the outer edge portion 16b of the orbiting scroll 16 in the radial direction RD, the cutout portions 3d at two locations are exposed from the outer edge portion 16b. Therefore, the refrigerant flowing into the internal space IS from the suction port 2b is guided to the scroll compression mechanism 5 from the two cutout portions 3d exposed from the outer edge portion 16b, and is suctioned into the scroll compression mechanism 5.
In Fig. 6, the center Co of the orbiting scroll 16 is located to the left of the axis X in the figure. Therefore, on a right side of the outer edge portion 16b of the orbiting scroll 16 in the radial direction RD, the two cutout portions 3d are exposed from the outer edge portion 16b. Therefore, the refrigerant flowing into the internal space IS from the suction port 2b is guided to the scroll compression mechanism 5 from the two cutout portions 3d exposed from the outer edge portion 16b, and is suctioned into the scroll compression mechanism 5.
In Fig. 7, the center Co of the orbiting scroll 16 is located below the axis X in the figure. Therefore, on an upper side of the outer edge portion 16b of the orbiting scroll 16 in the radial direction RD, the two cutout portions 3d are exposed from the outer edge portion 16b. Therefore, the refrigerant flowing into the internal space IS from the suction port 2b is guided to the scroll compression mechanism 5 from the two cutout portions 3d exposed from the outer edge portion 16b, and is suctioned into the scroll compression mechanism 5.
In Fig. 8, the center Co of the orbiting scroll 16 is located to the right of the axis X in the figure. Therefore, on a left side of the outer edge portion 16b of the orbiting scroll 16 in the radial direction RD, the two cutout portions 3d are exposed from the outer edge portion 16b. Therefore, the refrigerant flowing into the internal space IS from the suction port 2b is guided to the scroll compression mechanism 5 from the two cutout portions 3d exposed from the outer edge portion 16b, and is suctioned into the scroll compression mechanism 5.
As described above, when the orbiting scroll 16 is caused to rotate around and orbit the axis X, in each phase of the revolution, the refrigerant that has flowed into the internal space IS from the suction port 2b is guided to the scroll compression mechanism 5 from the two cutout portions 3d exposed from the outer edge portion 16b, and is suctioned into the scroll compression mechanism 5. Therefore, compared to a case where the cutout portion 3d is not provided in the front housing 3, a pressure loss when the refrigerant gas flows from the internal space IS to the scroll compression mechanism 5 is reduced.
The drive shaft 6 is rotatably supported by the front housing 3 via the main bearing 7 and the sub-bearing 8. In addition, a pulley 11a of the electromagnetic clutch 11 installed to be rotatable on an outer peripheral portion of the front housing 3 via the bearing 10 is detachably connected to a front end portion of the drive shaft 6 protruding outward from the front housing 3 via the lip seal 9, via a clutch armature plate 11b. In a case where a power supply of the electromagnetic clutch 11 is turned on and the pulley 11a is connected to the clutch armature plate 11b, external power for driving the pulley 11a is transmitted to the drive shaft 6, causing the drive shaft 6 to rotate around the axis X shown in Fig. 1.
The crank pin (eccentric shaft) 13 that is disposed to be offset from the axis X is integrally provided at a rear end of the drive shaft 6. The rear end of the drive shaft 6 is connected to the orbiting scroll 16 of the scroll compression mechanism 5, which will be described later, via a known variable orbiting radius mechanism including the drive bush 14 that makes an orbiting radius of the orbiting scroll 16 variable. The drive shaft 6 is attached to the orbiting scroll 16 via the crank pin 13. The balance weight 30 for balancing a weight with the orbiting scroll 16 attached eccentrically relative to the drive shaft 6 is attached to the variable orbiting radius mechanism.
The scroll compression mechanism 5 is a mechanism that is driven by the drive shaft 6 rotating around the axis X, that compresses the refrigerant gas flowing in from the suction port 2b formed in the outer peripheral surface of the rear housing 2, and that discharges the refrigerant gas from the discharge port (not shown) formed in the rear housing 2. The scroll compression mechanism 5 includes the fixed scroll 15 and the orbiting scroll 16 that are formed of, for example, an aluminum alloy.
The scroll compression mechanism 5 has the fixed scroll 15 and the orbiting scroll 16 that meshes with the fixed scroll 15 with a phase shift of 180 degrees, and is a mechanism that causes the orbiting scroll 16 to perform rotational and orbital motion around the axis X with respect to the fixed scroll 15. The scroll compression mechanism 5 forms a pair of compression chambers between the fixed scroll 15 and the orbiting scroll 16, and compresses the refrigerant gas by moving a fluid while gradually reducing a volume from an outer peripheral position to a central position.
The fixed scroll 15 includes the discharge port (not shown) that discharges the compressed fluid to a central portion, and is fixed to a bottom wall surface of the rear housing 2 via bolts (not shown). In addition, the orbiting scroll 16 is connected to the crank pin 13 of the drive shaft 6 via the drive bush 14, and is supported on a surface of the front housing 3 on the scroll compression mechanism 5 side via the Oldham link 31 to be capable of performing rotational and orbital motion. The crank pin 13 is disposed at a position eccentrically relative to the axis X of the drive shaft 6.
In addition, the fixed scroll 15 and the orbiting scroll 16 are configured such that scroll-shaped wraps are erected on end plates disposed on planes orthogonal to the axis X. Between the fixed scroll 15 and the orbiting scroll 16, the pair of compression chambers partitioned by the respective end plates and the respective scroll-shaped wraps are formed symmetrically with respect to the center of the scrolls. In addition, the orbiting scroll 16 is driven to smoothly rotate around and orbit the fixed scroll 15.
The main bearing 7 supports the drive shaft 6 on the axis X, with an inner ring 7a being press-fitted to the drive shaft 6 and an outer ring 7b being press-fitted to the end portion of the front housing 3 on the scroll compression mechanism 5 side. The main bearing 7 is held on the axis X by the front housing 3. The main bearing 7 is a radial ball bearing that is disposed closer to the scroll compression mechanism 5 than the sub-bearing 8 and has a larger outer diameter than the sub-bearing 8.
The sub-bearing 8 supports the drive shaft 6 on the axis X together with the main bearing 7, with an inner ring being press-fitted to the drive shaft 6 and an outer ring being press-fitted to the front housing 3. The sub-bearing 8 is held on the axis X by the front housing 3. The sub-bearing 8 is a needle bearing that is disposed closer to the scroll compression mechanism 5 than the lip seal 9 and has a smaller outer diameter than the main bearing 7.
The lip seal 9 is a member that comes into contact with an outer peripheral surface of the drive shaft 6 and prevents leakage of the refrigerant gas along the drive shaft 6. The lip seal 9 is attached to an inner peripheral surface of the front housing 3 and is held on the axis X.
The operations and effects of the compressor 1 of the present embodiment described above will be described.
According to the compressor 1 of the present embodiment, the drive shaft 6 rotates around the axis X, the orbiting scroll 16 to which the drive shaft 6 is attached via the crank pin 13 performs rotational and orbital motion relative to the fixed scroll 15 to compress and discharge the refrigerant gas. The refrigerant gas is guided from the suction port 2b into the internal space IS of the rear housing 2 accommodating the scroll compression mechanism 5. In the front housing 3 that is attached to close the opening 2a of the rear housing 2, the recess 3a for accommodating the main bearing 7 and the sliding surface 3Ba with which the end surface of the orbiting scroll 16 comes into contact are formed.
At the position where the sliding surface 3Ba is disposed, the outer edge portion 3c of the front housing 3 in the radial direction RD is disposed with the gap CL from the inner peripheral surface 2c of the rear housing 2. In addition, at the position where the sliding surface 3Ba is disposed, the outer edge portion 3c of the front housing 3 in the radial direction RD has the cutout portions 3d cut out inward in the radial direction RD at a plurality of locations in the circumferential direction CD so that the refrigerant gas guided from the suction port 2b to the internal space IS is guided to the scroll compression mechanism 5 side in the direction along the axis X.
Since the cutout portion 3d is formed in the outer edge portion 3c of the front housing 3 in the radial direction RD at the position where the sliding surface 3Ba is disposed, a distance from an outer edge of the front housing 3 at the position corresponding to the cutout portion 3d in the circumferential direction CD to the inner peripheral surface of the first housing is longer than a distance from an outer edge of the sliding surface 3Ba at a position not corresponding to the cutout portion 3d in the circumferential direction CD to the inner peripheral surface 2c of the rear housing 2 through the gap CL. Since a wider space is formed at the position corresponding to the cutout portion 3d in the circumferential direction CD compared to the other positions in the circumferential direction CD, a pressure loss when the refrigerant flows into the scroll compression mechanism 5 is reduced compared to a case where the cutout portion 3d is not formed. Therefore, it is possible to reduce a pressure loss when the refrigerant gas guided from the suction port 2b to the internal space IS is guided to the scroll compression mechanism 5 and to improve the compression efficiency.
According to the compressor 1 of the present embodiment, by adopting a configuration in which the front housing 3 has the main body portion 3A and the thrust plate 3B, the thrust plate 3B can be disposed and the sliding surface 3Ba can be easily formed without performing processing on an end surface of the front housing 3 to form a sliding surface. In addition, the cutout shape 3Ab is formed in the main body portion 3A, the cutout shape 3Bb is formed in the thrust plate 3B, and the cutout shape 3Ab and the cutout shape 3Bb are disposed at the same position in the circumferential direction, so that a flow path through which the refrigerant gas passes can be formed without causing a pressure loss.
According to the compressor 1 of the present embodiment, since the cutout portions 3d are formed at two or more locations in the circumferential direction, the refrigerant can be appropriately guided from the cutout portions 3d to the scroll compression mechanism 5 at each position when the orbiting scroll 16 performs rotational and orbital motion around the axis X.

[Second Embodiment]

Hereinafter, a compressor 1A according to a second embodiment of the present disclosure will be described with reference to the drawings. The compressor 1A according to the present embodiment is a modification example of the compressor 1 according to the first embodiment, and is similar to the first embodiment except for a case described below in detail, and description thereof will be omitted below.
In the compressor 1 according to the first embodiment, the front housing 3 is configured to include two members, the main body portion 3A and the thrust plate 3B. Contrary to this, in the compressor 1A according to the present embodiment, the front housing 3 is configured to include a first main body portion 3C, a second main body portion 3D, and the thrust plate 3B. The thrust plate 3B of the present embodiment is the same as the thrust plate 3B of the first embodiment.
Fig. 9 is a longitudinal sectional view showing a schematic configuration of the compressor 1A according to the second embodiment of the present disclosure. Fig. 9 is a sectional view taken along line B-B of the compressor 1A shown in Fig. 10, which will be described later. White arrows shown in Fig. 9 indicate an example of a circulation path of the refrigerant gas.
The front housing 3 includes the first main body portion 3C in which the recess 3a and the recess 3b are formed, the second main body portion 3D in which the sliding surface 3Ba and the cutout portion 3d are formed, and the plate-shaped thrust plate 3B that is attached to an end portion of the second main body portion 3D on the scroll compression mechanism 5 side. The thrust plate 3B has the sliding surface 3Ba that comes into contact with the end surface 16a of the orbiting scroll 16, the sliding surface 3Ba being formed at the end portion on the scroll compression mechanism 5 side. The thrust plate 3B is formed of, for example, a metallic material primarily containing iron, and by coating the thrust plate 3B with a fluororesin material (for example, PTFE), the sliding surface 3Ba with high lubricity is formed.
As shown in Fig. 9, the first main body portion 3C has a fastening hole 3Ca in which a female screw to which fastening bolt 20 is fastened is formed. The first main body portion 3C has the fastening holes 3Ca at positions (four locations in the example shown in Fig. 10) corresponding to the cutout portions 3d formed in the second main body portion 3D in the circumferential direction CD around the axis X.
As shown in Fig. 9, the second main body portion 3D has a plurality of through-holes 3Da, through which the fastening bolts 20 pass, at an end portion on a first main body portion 3C side in the direction along the axis X. The second main body portion 3D has a plurality of the cutout portions 3d cut out inward in the radial direction RD at a plurality of locations (four locations in Fig. 10) in the circumferential direction CD around the axis X. The through-hole 3Da is formed at the position corresponding to the cutout portion 3d of the second main body portion 3D in the circumferential direction CD.
According to the compressor 1A of the present embodiment, the front housing 3 can be combined with a configuration in which the front housing 3 is divided into the first main body portion 3C in which the recess 3a is formed and the second main body portion 3D in which the sliding surface 3Ba and the cutout portion 3d are formed.
In addition, the second main body portion 3D is formed with the plurality of through-holes 3Da, through which the fastening bolts 20 pass, at the positions corresponding to the cutout portions 3d in the circumferential direction CD. Therefore, when the fastening bolts 20 are inserted into the through-holes 3Da of the second main body portion 3D and fastened to the fastening holes 3Ca of the first main body portion 3C, the fastening bolts 20 can be easily guided to the through-holes 3Da through the cutout portions 3d. Accordingly, workability of an assembly work of connecting the first main body portion 3C and the second main body portion 3D with the fastening bolts 20 is improved.

[Other Embodiments]

In the first and second embodiments, the thrust plate 3B forming the sliding surface 3Ba is a member separate from the main body portion of the front housing 3. However, other variations may be adopted. For example, the thrust plate 3B may not be provided, and the sliding surface 3Ba may be formed by coating an end surface of the main body portion 3A of the first embodiment on the scroll compression mechanism 5 side with a fluororesin material (for example, PTFE). Similarly, the thrust plate 3B may not be provided, and the sliding surface 3Ba may be formed by coating an end surface of the second main body portion 3D of the second embodiment on the scroll compression mechanism 5 side with a fluororesin material (for example, PTFE).
The scroll compressor described in the present embodiment described above is understood, for example, as follows.
A scroll compressor (1) according to a first aspect of the present disclosure includes: a compression portion (5) that includes a fixed scroll (15) and an orbiting scroll (16) that meshes with the fixed scroll; a drive shaft (6) that rotates around an axis (X) and that is attached to the orbiting scroll via an eccentric shaft (13) disposed eccentrically relative to the axis; a bearing portion (7) that supports the drive shaft; a first housing (2) that accommodates the compression portion and that is formed in a cylindrical shape along the axis; and a second housing (3) that is attached to close an opening of the first housing and that is provided with a recess (3a) for holding the bearing portion on the axis and a sliding surface (3Bb) that comes into contact with an end surface of the orbiting scroll, at an end portion on a compression portion side, in which a suction port (2b) that guides a refrigerant compressed by the compression portion to an internal space (IS) on a bearing portion side in a direction along the axis relative to the sliding surface is formed in the first housing, and at a position where the sliding surface is disposed, an outer edge portion (3c) of the second housing in a radial direction orthogonal to the axis is disposed with a gap (CL) from an inner peripheral surface (2c) of the first housing, and has cutout portions (3d) that are cut out inward in the radial direction at a plurality of locations in a circumferential direction (CD) around the axis so as to guide the refrigerant guided from the suction port to the internal space to the compression portion side in the direction along the axis.
According to the scroll compressor of the present disclosure, the drive shaft rotates around the axis, the orbiting scroll to which the drive shaft is attached via the eccentric shaft performs rotational and orbital motion relative to the fixed scroll to compress and discharge the refrigerant gas. The refrigerant is guided from the suction port into the internal space of the first housing that accommodates the compression portion. In the second housing that is attached to close the opening of the first housing, the recess for accommodating the bearing portion and the sliding surface with which the end surface of the orbiting scroll comes into contact are formed.
At the position where the sliding surface is disposed, the outer edge portion of the second housing in the radial direction is disposed with the gap from the inner peripheral surface of the first housing. In addition, at the position where the sliding surface is disposed, the outer edge portion of the second housing in the radial direction has the cutout portions cut out inward in the radial direction at a plurality of locations in the circumferential direction so that the refrigerant guided from the suction port to the internal space is guided to the compression portion side in the direction along the axis.
Since the cutout portion is formed in the outer edge portion of the second housing in the radial direction at the position where the sliding surface is disposed, a distance from an outer edge of the second housing at the position corresponding to the cutout portion in the circumferential direction to the inner peripheral surface of the first housing is longer than a distance from an outer edge of the second housing at a position not corresponding to the cutout portion in the circumferential direction to the inner peripheral surface of the first housing through the gap. Since a wider space is formed at the position corresponding to the cutout portion in the circumferential direction compared to the other positions in the circumferential direction, a pressure loss when the refrigerant flows into the compression portion is reduced compared to a case where the cutout portion is not formed. Therefore, it is possible to reduce a pressure loss when the refrigerant guided from the suction port to the internal space is guided to the compression portion and to improve compression efficiency.
The scroll compressor according to a second aspect of the present disclosure further includes the following configuration in the first aspect. That is, the second housing (3) has a main body portion (3A) in which the recess is formed, and a plate-shaped thrust plate (3B) that is attached to the main body portion and that forms the sliding surface, and the cutout portion is formed by disposing a first cutout shape (3Ab) formed in the main body portion and a second cutout shape (3Bb) formed in the thrust plate at the same position in the circumferential direction.
According to the scroll compressor according to the second aspect of the present disclosure, by adopting a configuration in which the second housing has the main body portion and the thrust plate, the thrust plate can be disposed and the sliding surface can be easily formed without performing processing on an end surface of the second housing to form a sliding surface. In addition, the first cutout shape is formed in the main body portion, the second cutout shape is formed in the thrust plate, and the first and second cutout shapes are disposed at the same position in the circumferential direction, so that a flow path through which the refrigerant passes can be formed without causing a pressure loss.
The scroll compressor according to a third aspect of the present disclosure further includes the following configuration in the first aspect. That is, the second housing includes a first main body portion (3C) in which the recess is formed and a second main body portion (3D) in which the sliding surface and the cutout portions are formed, the first main body portion has a plurality of fastening holes (3Ca) into which fastening bolts (20) are fastened, and the second main body portion has through-holes (3Da) through which the fastening bolts pass at positions corresponding to the cutout portions in the circumferential direction.
According to the scroll compressor according to the third aspect of the present disclosure, the second housing can be configured to be divided into the first main body portion in which the recess is formed and the second main body portion in which the sliding surface and the cutout portion are formed. In addition, the second main body portion is formed with a plurality of the through-holes, through which fastening bolts pass, at the positions corresponding to the cutout portions in the circumferential direction. Therefore, when the fastening bolts are inserted into the through-holes of the second main body portion and fastened to the fastening holes of the first main body portion, the fastening bolts can be easily guided to the through-holes through the cutout portions. In this manner, workability of an assembly work of connecting the first main body portion and the second main body portion with the fastening bolts is improved.
The scroll compressor according to a fourth aspect of the present disclosure further includes the following configuration in any one of the first to third aspects. That is, the cutout portions are formed at two or more locations in the circumferential direction.
According to the scroll compressor of the fourth aspect of the present disclosure, since the cutout portions are formed at two or more locations in the circumferential direction, the refrigerant can be appropriately guided from the cutout portions to the compression portion at each position when the orbiting scroll performs rotational and orbital motion around the axis.

Reference Signs List

1, 1A: compressor
2: rear housing (first housing)
2a: opening
2b: suction port
2c: inner peripheral surface
3: front housing (second housing)
3A: main body portion
3Ab: cutout shape
3B: thrust plate
3Ba: sliding surface
3Bb: cutout shape
3C: first main body portion
3Ca: fastening hole
3D: second main body portion
3Da: through-hole
3a, 3b: recess
3c: outer edge portion
3d: cutout portion
5: scroll compression mechanism (compression portion)
6: drive shaft
7: main bearing (bearing portion)
13: crank pin (eccentric shaft)
14: drive bush
15: fixed scroll
16: orbiting scroll
16a: end surface
16b: outer edge portion
20: fastening bolt
CD: circumferential direction
CL: gap
Co: center
IS: internal space
RD: radial direction
X: axis

Claims

A scroll compressor comprising:
a compression portion that includes a fixed scroll and an orbiting scroll that meshes with the fixed scroll;

a drive shaft that rotates around an axis and that is attached to the orbiting scroll via an eccentric shaft disposed eccentrically relative to the axis;

a bearing portion that supports the drive shaft;

a first housing that accommodates the compression portion and that is formed in a cylindrical shape along the axis; and

a second housing that is attached to close an opening of the first housing and that is provided with a recess for holding the bearing portion on the axis and a sliding surface that comes into contact with an end surface of the orbiting scroll, at an end portion on a compression portion side,

wherein a suction port that guides a refrigerant compressed by the compression portion to an internal space on a bearing portion side in a direction along the axis relative to the sliding surface is formed in the first housing, and

at a position where the sliding surface is disposed, an outer edge portion of the second housing in a radial direction orthogonal to the axis is disposed with a gap from an inner peripheral surface of the first housing, and has cutout portions that are cut out inward in the radial direction at a plurality of locations in a circumferential direction around the axis so as to guide the refrigerant guided from the suction port to the internal space to the compression portion side in the direction along the axis.
The scroll compressor according to Claim 1,
wherein the second housing has a main body portion in which the recess is formed, and a plate-shaped thrust plate that is attached to the main body portion and that forms the sliding surface, and

the cutout portion is formed by disposing a first cutout shape formed in the main body portion and a second cutout shape formed in the thrust plate at the same position in the circumferential direction.
The scroll compressor according to Claim 1,
wherein the second housing includes a first main body portion in which the recess is formed and a second main body portion in which the sliding surface and the cutout portions are formed,

the first main body portion has a plurality of fastening holes into which fastening bolts are fastened, and

the second main body portion has through-holes through which the fastening bolts pass at positions corresponding to the cutout portions in the circumferential direction.
The scroll compressor according to any one of Claims 1 to 3,
wherein the cutout portions are formed at two or more locations in the circumferential direction.