Scroll compressor

Abstract

Provided is a scroll compressor comprising a bearing housing that is formed in a tube shape along an axis (X1) which is the center around which an orbiting scroll orbits, and a rear housing (20) that seals one end of the bearing housing, wherein the rear housing (20) has: an end surface that is positioned facing the bearing housing; a bottom surface (22) that is positioned in a position further away from the bearing housing than the end surface is; a cylindrical portion (23) that is positioned on the inner circumferential side of the bottom surface (22) relative to the axis (X1) and forms a discharge space for a refrigerant; an annular portion (24) that is positioned on the outer circumferential side of the bottom surface (22) relative to the axis and protrudes in an annular shape; and reinforcing portions (25) that are positioned at a plurality of locations in the circumferential direction around the axis, protrude along a direction away from the bearing housing with respect to the bottom surface (22), and join the cylindrical portion (23) and the annular portion (24).

Description

Scroll Compressor

[0001] The present disclosure relates to scroll compressors.

[0002] Conventionally, scroll compressors having a fixed scroll and an orbiting scroll meshed with the fixed scroll are known (see, for example, Patent Document 1). Patent Document 1 discloses a scroll compressor having a housing that accommodates a scroll compression mechanism and a front housing that seals one end of the housing, and a discharge chamber from which compressed refrigerant gas is discharged formed between the housing and the front housing.

[0003] Japanese Patent Application Laid-Open No. 2007-327436

[0004] While lightweight scroll compressors are required, they also need to have a housing strong enough to prevent compressed refrigerant gas from leaking to the outside. In the scroll compressor disclosed in Patent Document 1, bolts inserted into the fixed scroll directly fasten the rear housing to the fixed scroll, and bolts inserted into the front housing directly fasten the rear housing to the front housing, so that a sealing force can be ensured that the front housing seals the end of the rear housing that houses the scroll compression mechanism.

[0005] However, for example, when a mechanism is employed in which the rear housing and the fixed scroll are fastened together, and the rear housing and the front housing are fastened together, using only bolts inserted into the front housing (when a mechanism is employed in which the fixed scroll is indirectly fastened together with bolts inserted into the front housing), the rear housing may not be strong enough to provide a sufficient sealing force for sealing the end of the rear housing that houses the scroll compression mechanism with the front housing. For example, the strength can be increased by increasing the thickness of the metal material forming the rear housing, but this would increase the weight of the scroll compressor.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide a scroll compressor that can achieve weight reduction while increasing the strength of the second housing that seals the first housing that houses the compression section in order to ensure sealing force to house the compression section.

[0007] A scroll compressor according to one aspect of the present disclosure includes a compression section including a fixed scroll having a spiral-shaped first wall body erected on one side surface of a first end plate, and an orbiting scroll having a spiral-shaped second wall body erected on one side surface of a second end plate and supported by the first wall body to be prevented from rotating on its own axis and to be capable of orbital orbital movement; a first housing formed in a cylindrical shape along an axis about which the orbiting scroll orbits and having an internal space for accommodating the compression section; and a second housing sealing one end of the first housing along the axis, wherein the first end plate of the fixed scroll accommodated in the first housing is formed with a discharge port through which fluid compressed by the fixed scroll and the orbiting scroll is discharged, and the second housing is formed with a discharge port extending along a plane perpendicular to the axis. a cylindrical portion disposed on the inner periphery of the bottom surface with respect to the axis, protruding cylindrically from the bottom surface in a direction away from the first housing, and forming a discharge space between the cylindrical portion and the first end plate into which the refrigerant discharged from the discharge port is guided; an annular portion disposed on the outer periphery of the bottom surface with respect to the axis, protruding annularly from the bottom surface in a direction away from the first housing; and reinforcing portions disposed at a plurality of locations circumferentially about the axis, protruding from the bottom surface in a direction away from the first housing, and connecting the cylindrical portion and the annular portion.

[0008] According to the present disclosure, it is possible to provide a scroll compressor that can achieve weight reduction while increasing the strength of the second housing that seals the first housing that houses the compression section in order to ensure the sealing force to house the compression section.

[0009] Fig. 1 is a longitudinal sectional view showing a schematic configuration of a scroll compressor according to an embodiment of the present disclosure. Fig. 2 is a right side view of the scroll compressor shown in Fig. 1. Fig. 3 is a sectional view taken along the arrows A-A of the scroll compressor shown in Fig. 2. Fig. 4 is a sectional view taken along the arrows B-B of the scroll compressor shown in Fig. 2. Fig. 5 is a sectional view taken along the arrows C-C of the scroll compressor shown in Fig. 2. Fig. 6 is a plan view of the rear housing shown in Fig. 2, viewed from the bearing housing side.

[0010] A scroll compressor 100 according to an embodiment of the present disclosure will be described with reference to the drawings. The scroll compressor 100 of this embodiment is used in, for example, a vehicle air conditioner.

[0011] Fig. 1 is a vertical cross-sectional view showing a schematic configuration of a scroll compressor 100 according to this embodiment. As shown in Fig. 1, the scroll compressor 100 includes a bearing housing (first housing) 10, a rear housing (second housing) 20, a front housing (third housing) 30, a scroll compression mechanism (compression unit) 40, a motor 50, a bearing unit 60, an inverter 70, and a gasket 80.

[0012] The bearing housing 10, the rear housing 20, and the front housing 30 form the outer shell of the scroll compressor 100 and are made of an aluminum alloy. The bearing housing 10 is formed in a cylindrical shape along an axis X1 that is the center of rotation of the orbiting scroll 42. The bearing housing 10 has an internal space that accommodates a bearing portion 60 and the scroll compression mechanism 40.

[0013] The rear housing 20 seals one end of the bearing housing 10 along the axis X1, and is provided with a discharge port (not shown) for the refrigerant gas compressed by the scroll compression mechanism 40. The front housing 30 seals the other end of the bearing housing 10 along the axis X1, and is provided with an internal space that houses the motor 50 and the inverter 70. The internal space of the front housing 30 that houses the motor 50 communicates with the internal space of the bearing housing 10 that houses the bearing portion 60. The internal space that houses the motor 50 and the internal space that houses the inverter 70 are independent spaces that do not communicate with each other.

[0014] 1, an end face 10a of the bearing housing 10 has an insertion hole 10b into which a positioning pin 20a is inserted. An end face 21 of the rear housing 20 has an insertion hole 20b into which the positioning pin 20a is inserted. With the positioning pin 20a inserted into both the insertion hole 10b and the insertion hole 20b, the end face 10a of the bearing housing 10 and the end face 21 of the rear housing 20 are arranged opposite each other. The multiple positioning pins 20a position the rear housing 20 relative to the bearing housing 10 so that it does not rotate around the axis X1.

[0015] 1, an insertion hole into which a positioning pin 20a is inserted is formed in the end plate 41A of the fixed scroll 41. An insertion hole into which the positioning pin 20a is inserted is formed in the end face 21 of the rear housing 20. With the positioning pin 20a inserted into both the insertion hole of the fixed scroll 41 and the insertion hole of the rear housing 20, the end plate 41A of the fixed scroll 41 and the end face 21 of the rear housing 20 are arranged opposite each other. The multiple positioning pins 20a position the fixed scroll 41 relative to the rear housing 20 so that it does not rotate around the axis X1.

[0016] The front housing 30 is provided with a suction port (not shown) for drawing in a refrigerant. Refrigerant supplied from the outside is introduced into the interior space of the front housing 30 through the suction port. The refrigerant introduced into the front housing 30 passes through the motor 50 along the axis X1 and is guided toward the scroll compression mechanism 40. The refrigerant drawn in through the suction port is a mixed refrigerant (fluid) containing lubricating oil and refrigerant gas.

[0017] The scroll compression mechanism 40 is a device that is disposed inside the bearing housing 10 and rotates about the axis X1 to compress the refrigerant gas. The scroll compression mechanism 40 has a fixed scroll 41 that is fixedly sandwiched between the bearing housing 10 and the rear housing 20, and an orbiting scroll 42 that meshes with the fixed scroll 41. The scroll compression mechanism 40 compresses the refrigerant gas by causing the orbiting scroll 42 to revolve relative to the fixed scroll 41 using the driving force of the motor 50.

[0018] The fixed scroll 41 has a spiral wrap (first wall) 41B that is a wall provided on one side of an end plate (first end plate) 41A. The end plate 41A has a discharge port 41C formed therein through which the refrigerant gas compressed by the fixed scroll 41 and the orbiting scroll 42 is discharged.

[0019] The orbiting scroll 42 has a spiral wrap (second wall) 42B, which is a wall provided on one side of an end plate (second end plate) 42A. The orbiting scroll 42 is connected to an eccentric shaft (not shown) connected to a motor 50, and is supported so as to be capable of orbital rotation via a rotation-preventing mechanism (not shown). The orbiting scroll 42 is meshed with the spiral wrap 41B of the fixed scroll 41, and is supported so as to be capable of orbital rotation while being prevented from rotating.

[0020] 1, the scroll compression mechanism 40 has a reed valve 43 attached to the fixed scroll 41 so as to close the discharge port 41C. The reed valve 43 opens when the pressure of the refrigerant gas in the compression chamber 40A reaches or exceeds a predetermined pressure, and guides the refrigerant gas discharged from the discharge port 41C to the discharge space 41D. The refrigerant gas guided to the discharge space 41D is then guided to the outside through a discharge port (not shown).

[0021] The motor 50 is a device that causes the orbiting scroll 42 of the scroll compression mechanism 40 to revolve about the axis X1 relative to the fixed scroll 41. The motor 50 is connected to the orbiting scroll 42 via an eccentric shaft (not shown).

[0022] The bearing 60 is a member that supports a rotating shaft (not shown) that rotates about the axis X1 by the motor 50. An eccentric shaft that is disposed eccentrically with respect to the axis X1 is provided at the end of the rotating shaft on the scroll compression mechanism 40 side.

[0023] The inverter 70 is a device that generates a drive voltage for driving the motor 50 and controls the rotation speed of the motor 50. The gasket 80 is disposed between the end face 10 a of the bearing housing 10 on the rear housing 20 side and the end face 21 of the rear housing 20 on the bearing housing 10 side, and is a member that forms a sealing area to prevent refrigerant from leaking out from between the end face 10 a and the end face 21.

[0024] Next, with reference to Figures 2 to 5, the structure of the rear housing 20, which realizes weight reduction while increasing strength to ensure a sealing force for accommodating the scroll compression mechanism 40, will be described. Figure 2 is a right side view of the scroll compressor 100 shown in Figure 1. Figure 3 is a cross-sectional view of the scroll compressor 100 shown in Figure 2, taken along the line A-A. Figure 4 is a cross-sectional view of the scroll compressor 100 shown in Figure 2, taken along the line B-B. Figure 5 is a cross-sectional view of the scroll compressor 100 shown in Figure 2, taken along the line C-C.

[0025] 2 to 5, the rear housing 20 has a bottom surface 22, a cylindrical portion 23, an annular portion 24, and a reinforcing portion 25. The bottom surface 22, the cylindrical portion 23, the annular portion 24, and the reinforcing portion 25 are integrally formed from an aluminum alloy. As shown in FIG. 3, an end surface 21 of the rear housing 20 is a surface that is disposed along a plane perpendicular to the axis X1 and that faces the bearing housing 10. As shown in FIG. 4, the bottom surface 22 of the rear housing 20 is disposed along a plane perpendicular to the axis X1 and that is located farther from the bearing housing 10 by a distance L1 than the end surface 21.

[0026] The cylindrical portion 23 is disposed on the inner peripheral side of the bottom surface 22 with respect to the axis X1 and protrudes cylindrically from the bottom surface 22 in a direction away from the bearing housing 10. As shown in Fig. 4, the length from the end surface 21 of the rear housing 20 to the top 23a of the cylindrical portion 23 is L2, which is longer than L1. As shown in Figs. 2 and 3, the cylindrical portion 23 has a maximum outer diameter D1 centered on the axis X1. As shown in Fig. 3, the cylindrical portion 23 forms a discharge space 41D between itself and the end plate 41A of the fixed scroll 41, into which the refrigerant discharged from the discharge port 41C is guided.

[0027] The annular portion 24 is disposed on the outer circumferential side of the bottom surface 22 with respect to the axis X1, and is a portion that protrudes in an annular shape from the bottom surface 22 in a direction away from the bearing housing 10. As shown in Figure 4, the distance from the end surface 21 of the rear housing 20 to the top 24a of the annular portion 24 is L3, which is longer than L1 and shorter than L2.

[0028] 2, the annular portion 24 is formed with insertion holes 24b at a plurality of locations (six locations in FIG. 2) in the circumferential direction CD, into which fastening bolts 90 are inserted to generate a pressing force that presses the rear housing 20 toward the bearing housing 10. A pair of reinforcing portions 25 are connected to the cylindrical portion 23 and the annular portion 24 at positions adjacent to the insertion holes 24b in the circumferential direction CD and on either side of the insertion holes 24b.

[0029] A fastening hole (not shown) is formed in the end of the front housing 30 on the bearing housing 10 side, into which a male screw formed at the tip of a fastening bolt 90 is fastened. The bearing housing 10 is fixed in a state sandwiched between the rear housing 20 and the front housing 30 along the axis X1 by fastening the fastening bolt 90 inserted into the insertion hole 24b of the rear housing 20 to the fastening hole formed in the front housing 30.

[0030] The reinforcing portions 25 are disposed at a plurality of locations in the circumferential direction CD about the axis X1 and protrude relative to the bottom surface 22 in a direction away from the bearing housing 10. The reinforcing portions 25 connect the cylindrical portion 23 and the annular portion 24 to reinforce the rear housing 20 and increase its strength.

[0031] 2 and 5, the reinforcing portion 25 is formed so that the width W1 in the circumferential direction CD gradually increases from the annular portion 24 toward the cylindrical portion 23. As shown in Fig. 4, the reinforcing portion 25 is formed so that the length L4 along the axis X1 relative to the bottom surface 22 gradually increases from the annular portion 24 toward the cylindrical portion 23.

[0032] 2 and 5, a seating surface 24c is formed around the insertion hole 24b, with which the head of the fastening bolt 90 comes into contact when the fastening bolt 90 is fastened to the front housing 30. The seating surface 24c is a flat surface formed in a plane perpendicular to the axis X1, and is formed in a substantially annular shape in a plan view. In the circumferential direction CD, a width W2 of the bottom surface 22 sandwiched between the pair of reinforcing portions 25 is narrower than a width W3 of the seating surface 24c with which the head of the fastening bolt 90 comes into contact.

[0033] Next, with reference to Fig. 6, the effect of increasing the strength of the rear housing 20 by the reinforcing portion 25 connecting the cylindrical portion 23 and the annular portion 24 will be described. Fig. 6 is a plan view of the rear housing 20 shown in Fig. 2, viewed from the bearing housing 10 side. As shown in Fig. 6, the end face 21 of the rear housing 20 has an inner end face 21A that contacts the end plate 41A of the fixed scroll 41, and an outer end face 21B that contacts the end face 10a of the bearing housing 10 via the gasket 80.

[0034] The fastening force generated by the fastening bolt 90, which is inserted into the insertion hole 24b of the rear housing 20 and fastened to the front housing 30, causes the inner end surface 21A to come into contact with the end plate 41A of the fixed scroll 41 and the outer end surface 21B to come into contact with the end surface 10a of the bearing housing 10 via the gasket 80. The fastening force generated by the fastening bolt 90 acts on the rear housing 20 as a pressing force for fixing the fixed scroll 41 and a pressing force for fixing the rear housing 20 to the front housing 30.

[0035] When a pressing force acts on the annular portion 24 on the outer periphery of the rear housing 20 where the insertion holes 24b are arranged, the annular portion 24 tends to deform toward the bearing housing 10 relative to the cylindrical portion 23. Therefore, in the rear housing 20 of this embodiment, the reinforcing portion 25 connects the cylindrical portion 23 and the annular portion 24 to increase the strength of the rear housing 20. This makes it possible to prevent a decrease in the pressing force for fixing the fixed scroll 41 and a decrease in the pressing force for fixing the rear housing 20 to the front housing 30, which would be caused by the annular portion 24 deforming toward the bearing housing 10 relative to the cylindrical portion 23.

[0036] The operation and effects of the scroll compressor 100 of the present embodiment described above will be described. According to the scroll compressor 100 of the present embodiment, the cylindrical portion 23 is disposed on the inner peripheral side of the bottom surface 22 of the rear housing 20 relative to the axis X1, which is the center of rotation of the orbiting scroll 42, and the annular portion 24 is disposed on the outer peripheral side of the bottom surface 22 of the rear housing 20 relative to the axis X1. Because the cylindrical portion 23 protrudes in a direction away from the bearing housing 10 on the inner peripheral side of the bottom surface 22 and the annular portion 24 protrudes in a direction away from the bearing housing 10 on the outer peripheral side of the bottom surface 22, the strength of the rear housing 20 is increased compared to a case in which the cylindrical portion 23 and the annular portion 24 are not provided. Furthermore, because the cylindrical portion 23 and the annular portion 24 are connected by the reinforcing portion 25, the strength of the entire rear housing 20, including the cylindrical portion 23 and the annular portion 24, is increased. Furthermore, since the multiple reinforcing portions 25 are disposed at multiple locations in the circumferential direction CD about the axis X1, the weight of the rear housing 20 can be reduced compared to when the entire rear housing 20 is reinforced in the circumferential direction CD. In this way, according to the scroll compressor 100 of this embodiment, it is possible to reduce the weight of the housing while increasing the strength of the housing to ensure a sealing force for accommodating the scroll compression mechanism 40.

[0037] According to the scroll compressor 100 of this embodiment, the width W1 of the reinforcing portion 25 in the circumferential direction CD is gradually increased from the annular portion 24 toward the cylindrical portion 23, thereby increasing the proportion of the area to which the reinforcing portion 25 is connected relative to the total circumferential length of the cylindrical portion 23, and thereby increasing the strength of the cylindrical portion 23 that forms the discharge space 41D where the pressure of the refrigerant acts.

[0038] According to the scroll compressor 100 of this embodiment, the length of the reinforcing portion 25 along the axis X1 relative to the bottom surface 22 is gradually increased from the annular portion 24 toward the cylindrical portion 23, thereby increasing the proportion of the area where the reinforcing portion 25 is connected to the length L2 of the cylindrical portion 23 in the axis X1 direction, and thereby increasing the strength of the cylindrical portion 23 that forms the discharge space 41D where the pressure of the refrigerant acts.

[0039] According to the scroll compressor 100 of this embodiment, the strength of the rear housing 20 in the vicinity of the insertion hole 24b can be increased by reinforcing the position sandwiching the insertion hole 24b in the circumferential direction CD, where the pressing force of the fastening bolt 90 acts, with a pair of reinforcing portions 25.

[0040] According to the scroll compressor 100 of this embodiment, by fastening the fastening bolt 90 inserted into the insertion hole 24b of the rear housing 20 to the fastening hole formed in the front housing 30, the bearing housing 10 can be fixed in a state where it is sandwiched between the rear housing 20 and the front housing 30 along the axis X1.

[0041] According to the scroll compressor 100 of this embodiment, the width W2 of the bottom surface 22 sandwiched between the pair of reinforcing portions 25 in the circumferential direction CD is narrower than the width W3 of the seat surface 24c with which the fastening bolt 90 contacts, thereby making it possible to increase the strength of the cylindrical portion 23 with the pair of reinforcing portions 25 while reducing the weight of the rear housing 20 by providing the bottom surface 22.

[0042] The scroll compressor according to the present embodiment described above can be understood as follows, for example. A scroll compressor (100) according to a first aspect of the present disclosure includes a compression section (40) having a fixed scroll (41) having a spiral-shaped first wall body (41B) erected on one side of a first end plate (41A), and an orbiting scroll (42) having a spiral-shaped second wall body (42B) erected on one side of a second end plate (42A) and meshed with the first wall body to be prevented from rotating on its own axis and supported so as to be capable of orbital orbital motion, a first housing (10) formed in a cylindrical shape along an axis (X1) about which the orbiting scroll orbits and having an internal space for accommodating the compression section, and a second housing (20) sealing one end of the first housing along the axis, wherein a discharge port (41C) is formed in the first end plate of the fixed scroll accommodated in the first housing and through which a fluid compressed by the fixed scroll and the orbiting scroll is discharged, and the second housing the refrigerant discharged from the discharge port is guided between the first end plate and the cylindrical portion (23); an annular portion (24) that is arranged on the outer periphery of the bottom surface with respect to the axis and that protrudes in a circular shape from the bottom surface in a direction away from the first housing; and reinforcing portions (25) that are arranged at a plurality of positions in the circumferential direction around the axis and that protrude from the bottom surface in a direction away from the first housing, connecting the cylindrical portion and the annular portion.

[0043] In the scroll compressor according to the first aspect of the present disclosure, the orbiting scroll revolves around the fixed scroll, causing the fluid introduced from the outer periphery of the compression section to be gradually compressed and discharged from the discharge port into the discharge space. The discharge space is formed between the first end plate of the fixed scroll and the cylindrical portion of the second housing, and is a space into which the refrigerant discharged from the discharge port is guided.

[0044] According to a scroll compressor according to a first aspect of the present disclosure, a cylindrical portion is disposed on the inner peripheral side of the bottom surface of the second housing relative to the axis about which the orbiting scroll orbits, and an annular portion is disposed on the outer peripheral side of the bottom surface of the second housing relative to the axis. Because the cylindrical portion protrudes away from the first housing on the inner peripheral side of the bottom surface and the annular portion protrudes away from the first housing on the outer peripheral side of the bottom surface, the strength of the second housing is increased compared to a housing without a cylindrical portion and an annular portion. Furthermore, because the cylindrical portion and the annular portion are connected by a reinforcing portion, the overall strength of the second housing, including the cylindrical portion and the annular portion, is increased. Furthermore, because multiple reinforcing portions are distributed at multiple locations circumferentially around the axis, the weight of the second housing can be reduced compared to a housing with an entire circumferential reinforcement. Thus, according to the scroll compressor according to the first aspect of the present disclosure, the strength of the second housing that seals the first housing, which houses the compression unit, to ensure a sealing force for accommodating the compression unit, can be increased while still achieving a reduced weight.

[0045] A scroll compressor according to a second aspect of the present disclosure is the scroll compressor of the first aspect, further including the following configuration: That is, the reinforcing portion is formed so that the width in the circumferential direction gradually increases from the annular portion toward the cylindrical portion.

[0046] According to the scroll compressor of the second aspect of the present disclosure, by gradually increasing the circumferential width of the reinforcing portion from the annular portion to the cylindrical portion, the proportion of the area where the reinforcing portion is connected to the total circumferential length of the cylindrical portion can be increased, thereby increasing the strength of the cylindrical portion that forms the discharge space where the pressure of the refrigerant acts.

[0047] A scroll compressor according to a third aspect of the present disclosure is the scroll compressor of the first or second aspect, further including the following configuration: That is, the reinforcing portion is formed so that the length along the axis relative to the bottom surface gradually increases from the annular portion toward the cylindrical portion.

[0048] According to the scroll compressor of the third aspect of the present disclosure, by gradually increasing the length along the axis of the reinforcing portion relative to the bottom surface from the annular portion to the cylindrical portion, the proportion of the area where the reinforcing portion is connected to the axial length of the cylindrical portion can be increased, and the strength of the cylindrical portion that forms the discharge space where the pressure of the refrigerant acts can be increased.

[0049] A scroll compressor according to a fourth aspect of the present disclosure is the first or second aspect, further including the following configuration: the annular portion is formed with insertion holes (24b) at a plurality of locations in the circumferential direction, into which fastening bolts (90) are inserted to generate a pressing force that presses the second housing toward the first housing, and a pair of the reinforcing portions are connected to the cylindrical portion and the annular portion at positions adjacent to and sandwiching the insertion holes in the circumferential direction.

[0050] According to the scroll compressor of the fourth aspect of the present disclosure, the strength of the second housing in the vicinity of the insertion hole can be increased by reinforcing the positions circumferentially sandwiching the insertion hole, where the pressing force from the fastening bolt is likely to act, with a pair of reinforcing parts.

[0051] A scroll compressor according to a fifth aspect of the present disclosure is the fourth aspect, further comprising the following configuration: a motor (50) that drives the orbiting scroll, and a third housing (30) that accommodates the motor and has fastening holes into which the fastening bolts are fastened, and the first housing is fixed in a state sandwiched between the second housing and the third housing along the axis by fastening the fastening bolts inserted into the insertion holes of the second housing to the fastening holes formed in the third housing.

[0052] According to the scroll compressor of the fifth aspect of the present disclosure, the first housing can be fixed in a state where it is sandwiched between the second housing and the third housing along the axis by fastening a fastening bolt inserted into an insertion hole of the second housing into a fastening hole formed in the third housing.

[0053] A scroll compressor according to a sixth aspect of the present disclosure is the fourth aspect, further including the following configuration: In the circumferential direction, the width of the bottom surface sandwiched between the pair of reinforcing portions is narrower than the width of a seat surface (24) with which the fastening bolt contacts.

[0054] According to the scroll compressor of the sixth aspect of the present disclosure, the width of the bottom surface sandwiched between the pair of reinforcing portions in the circumferential direction is narrower than the width of the seat surface with which the fastening bolt contacts, thereby increasing the strength of the cylindrical portion with the pair of reinforcing portions while reducing the weight of the second housing by providing the bottom surface.

[0055] DESCRIPTION OF SYMBOLS 10 Bearing housing (first housing) 10a End face 10b Insertion hole 20 Rear housing (second housing) 20a Positioning pin 20b Insertion hole 21 End face 22 Bottom face 23 Cylindrical portion 23a Top portion 24 Annular portion 24a Top portion 24b Insertion hole 24c Seat surface 25 Reinforcement portion 30 Front housing (third housing) 40 Scroll compression mechanism (compression portion) 40A Compression chamber 41 Fixed scroll 41A End plate 41D Discharge space 42 Orbiting scroll 43 Reed valve 50 Motor 60 Bearing portion 70 Inverter 80 Gasket 90 Fastening bolt 100 Scroll compressor CD Circumferential direction

Claims

1. A compression section including a fixed scroll having a first spiral wall body erected on one side of a first end plate, and a rotating scroll having a second spiral wall body erected on one side of a second end plate, and supported by the first wall body to be prevented from rotating on its axis while being supported so as to be capable of revolving around the first wall; a first housing formed in a cylindrical shape along an axis about which the rotating scroll revolves and having an internal space for accommodating the compression section; and a second housing sealing one end of the first housing along the axis, wherein the first end plate of the fixed scroll accommodated in the first housing has a discharge port formed therein through which fluid compressed by the fixed scroll and the orbiting scroll is discharged, and the second housing has an end surface disposed along a plane perpendicular to the axis and facing the first housing, and a bottom surface disposed along a plane perpendicular to the axis and positioned farther from the first housing than the end surface, a cylindrical portion disposed on an inner periphery of the bottom surface with respect to the axis, protruding cylindrically from the bottom surface in a direction away from the first housing, and forming a discharge space between the cylindrical portion and the first end plate, into which refrigerant discharged from the discharge port is guided; an annular portion disposed on an outer periphery of the bottom surface with respect to the axis, protruding annularly from the bottom surface in a direction away from the first housing; and reinforcing portions disposed at a plurality of locations in a circumferential direction around the axis, protruding from the bottom surface in a direction away from the first housing, and connecting the cylindrical portion and the annular portion.

2. A scroll compressor as set forth in claim 1, wherein said reinforcing portion is formed so that its width in the circumferential direction gradually increases from said annular portion toward said cylindrical portion.

3. A scroll compressor according to claim 1 or 2, wherein said reinforcing portion is formed so that its length along said axis relative to said bottom surface gradually increases from said annular portion toward said cylindrical portion.

4. A scroll compressor as described in claim 1 or claim 2, wherein the annular portion is formed with insertion holes for inserting fastening bolts that generate a pressing force for pressing the second housing towards the first housing at multiple points in the circumferential direction, and a pair of the reinforcing portions are connected to the cylindrical portion and the annular portion at positions adjacent to and sandwiching the insertion holes in the circumferential direction.

5. A scroll compressor as described in claim 4, comprising: a motor that drives the orbiting scroll; and a third housing that accommodates the motor and has a fastening hole into which the fastening bolt is fastened, wherein the first housing is fixed in a sandwiched state between the second housing and the third housing along the axis by fastening the fastening bolt inserted into the insertion hole of the second housing to the fastening hole formed in the third housing.

6. A scroll compressor according to claim 4, wherein the width of said bottom surface sandwiched between said pair of reinforcing parts in said circumferential direction is narrower than the width of the seat surface with which said fastening bolts come into contact.

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