Compressors and refrigeration cycle systems

Abstract

In a compressor where compressed refrigerant is discharged into the casing, deformation of the casing is effectively suppressed. [Solution] The compression mechanism (30) of the compressor (1) is welded and fixed to the body (11) of the casing (10) by a plurality of first welds (81) arranged in the circumferential direction. A first rib (91) is fixed to the outer circumferential surface of the body (11) in a direction intersecting the circumferential direction of the body (11). The first rib (91) is provided between the plurality of first welds (81) on the outer circumferential surface of the body (11).

Description

Technical Field

[0001] The present disclosure relates to a compressor and a refrigeration cycle apparatus including the same.

Background Art

[0002] Conventionally, in a compressor in which refrigerant compressed in a compression mechanism housed in a casing is discharged into the casing, there is a compressor that suppresses the casing from deforming (bulging) outward due to the pressure of the discharged refrigerant by reinforcing the casing (for example, see Patent Document 1 below).

[0003] Patent Document 1 provides a reinforcing cylindrical member on the outer peripheral side of a portion (a portion corresponding to the motor from the compression mechanism) where the casing is likely to deform outward due to the pressure of the discharged refrigerant. With such a configuration, in the above compressor, even when the casing tends to deform outward due to the pressure of the discharged refrigerant, the deformation of the casing is suppressed by the reinforcing cylindrical member and the casing is reinforced.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above compressor, the cylindrical member can be provided only in a portion where components such as the suction pipe and the discharge pipe do not protrude over the entire circumference of the casing. Therefore, in the above compressor, even in a portion where the casing is likely to deform outward due to the pressure of the discharged refrigerant, a cylindrical member cannot be provided at the same height position as the suction pipe and the discharge pipe, and there are cases where the deformation of the casing cannot be effectively suppressed.

[0006] The purpose of this disclosure is to effectively suppress deformation of the casing in a compressor in which compressed refrigerant is discharged into the casing. [Means for solving the problem]

[0007] The first aspect of this disclosure is, A casing (10) having a cylindrical casing body (11) and end plates (12, 13), A drive shaft (70) is provided within the casing (10) and extends in the axial direction of the casing body (11), A motor (20) is provided within the casing (10) and drives the drive shaft (70), The device comprises a compression mechanism (30) provided within the casing (10) and having a compression unit that compresses the refrigerant and discharges it into the casing (10), and a bearing fixed to the compression unit and supporting the drive shaft (70), The above-mentioned compression mechanism (30) is welded and fixed to the above-mentioned casing body (11) by a plurality of first welds (81) arranged in the circumferential direction. A first projection (91) is fixed to the outer circumferential surface of the casing body (11) in a direction intersecting the circumferential direction of the casing body (11). The first projection (91) is provided between the plurality of first welds (81) on the outer circumferential surface of the casing body (11). It is a compressor.

[0008] In the first embodiment, a first projection (91) is provided on the outer circumferential surface of the casing body (11) between a plurality of first welds (81) for fixing the compression mechanism (30) to the casing body (11), and extending in a direction intersecting the circumferential direction of the casing body (11). In other words, in the first embodiment, the first projection (91) is provided in a part of the casing (10) that is easily deformed by the internal pressure (pressure of the discharged refrigerant). At the location where the first projection (91) is fixed in the casing (10), when the casing body (11) tries to deform outward, a load is also applied to the first projection (91), and the deformation is suppressed by the resulting stress. Therefore, according to the first embodiment, deformation of the casing (10) can be effectively suppressed in a compressor in which compressed refrigerant is discharged into the casing (10).

[0009] A second aspect of this disclosure is, in the first aspect, The first projection (91) is provided in an annular first region (A1) on the outer circumferential surface of the casing body (11) that corresponds to the compression mechanism (30). It is a compressor.

[0010] In the second embodiment, the first projection (91) is provided near the welded portion of the compression mechanism (30). In other words, when the casing (10) is about to deform due to the pressure of the discharged refrigerant, the first projection (91) is provided in the portion where the deformation (bulging) is greatest. Therefore, according to the above configuration, the deformation of the casing (10) can be suppressed more effectively.

[0011] A third aspect of this disclosure is, in the second aspect, The first projection (91) is located on the first line (L1) connecting the plurality of first welds (81) on the outer circumferential surface of the casing body (11). It is a compressor.

[0012] In the third embodiment, the area along the first line (L1) connecting the multiple first welds (81) for fixing the compression mechanism (30) to the casing body (11) on the outer circumferential surface of the casing body (11) is a part that is easily deformed by the internal pressure of the casing (10) (pressure of the discharged refrigerant). In this embodiment, a first projection (91) is provided on this first line (L1). Therefore, according to the third embodiment, deformation of the casing (10) can be suppressed more effectively.

[0013] A fourth aspect of this disclosure is, in the first aspect, The motor (20) is welded and fixed to the casing body (11) by a plurality of second welds (82) arranged in the circumferential direction. A second projection (92) extending in a direction intersecting the circumferential direction of the casing body (11) is fixed to the outer circumferential surface of the casing body (11). The above-mentioned second projection (92) is provided between the plurality of second welds (82) on the outer circumferential surface of the casing body (11). It is a compressor.

[0014] In the fourth embodiment, a second projection (92) is provided on the outer circumferential surface of the casing (10) between a plurality of second welds (82) for fixing the motor (20) to the casing body (11), extending in a direction intersecting the circumferential direction of the casing body (11). In other words, in the fourth embodiment, a rib (second rib (92)) is provided not only in the part between the first welds (81) which are easily deformed by the internal pressure (pressure of the discharged refrigerant) of the casing (10), but also in the part between the second welds (82). At the location where the second projection (92) is fixed in the casing (10), when the casing body (11) tries to deform outward, a load is also applied to the second projection (92), and the deformation is suppressed by the resulting stress. Therefore, according to the fourth embodiment, even in a compressor in which not only the compression mechanism (30) but also the motor (20) is fixed to the casing (10) by welding, deformation of the casing (10) can be suppressed more effectively.

[0015] A fifth aspect of this disclosure is a fourth aspect, The motor (20) has a stator (21) and a rotor (22), and the stator (21) is fixed to the casing main body (11) by being welded at the plurality of second welding portions (82). The second protrusion (92) is provided in an annular second region (A2) corresponding to the stator (21) on the outer peripheral surface of the casing main body (11). It is a compressor.

[0016] In the fifth aspect, the second protrusion (92) is provided near the welding location (stator (21)) of the motor (20). That is, when the casing (10) tends to deform due to the pressure of the discharged refrigerant, the second protrusion (92) is provided at a portion where the deformation (bulging) is large. Therefore, according to the above configuration, the deformation of the casing (10) can be more effectively suppressed.

[0017] The sixth aspect of the present disclosure is based on the fifth aspect, the second protrusion (92) is located on a second line (L2) connecting the plurality of second welding portions (82) on the outer peripheral surface of the casing main body (11). It is a compressor.

[0018] In the sixth aspect, the second line (L2) connecting the plurality of second welding portions (82) for fixing the motor (20) to the casing main body (11) on the outer peripheral surface of the casing main body (11) is a portion that is likely to deform due to the internal pressure (pressure of the discharged refrigerant) of the casing (10), but the second protrusion (92) is provided on this second line (L2). Therefore, according to the sixth aspect, the deformation of the casing (10) can be more effectively suppressed.

[0019] The seventh aspect of the present disclosure is based on the fourth aspect, the plurality of second protrusions (92) are provided at positions circumferentially shifted from the plurality of first protrusions (91). It is a compressor.

[0020] In the seventh embodiment, by positioning the first projection (91) and the second projection (92) at circumferentially offset positions, there are more areas in the circumferential direction of the casing body (11) that are reinforced by the first and second projections (91, 92) and thus have their deformation suppressed. Therefore, according to the seventh embodiment, deformation of the casing (10) can be suppressed more effectively.

[0021] The eighth aspect of this disclosure is, in the second or third aspect, The above motor (20) has a stator (21) and a rotor (22), The stator (21) is fixed to the casing body (11) by shrink fitting or press fitting. It is a compressor.

[0022] In the eighth embodiment, the portion of the casing body (11) corresponding to the stator (21) is reinforced by the stator (21), which is fixed to the casing body (11) by shrink fitting or press fitting, making it less susceptible to deformation due to the internal pressure of the casing (10) (pressure of the discharged refrigerant). Therefore, according to the eighth embodiment, deformation of the casing (10) can be easily suppressed.

[0023] The ninth aspect of this disclosure is the eighth aspect, On the outer circumferential surface of the casing body (11), a third projection (93) is fixed on the side opposite to the compression mechanism (30), straddling the annular second region (A2) corresponding to the stator (21), in a direction intersecting the circumferential direction of the casing body (11). It is a compressor.

[0024] In the ninth embodiment, the outer surface of the casing body (11) opposite the compression mechanism (30) across the annular second region (A2) corresponding to the stator (21) is not reinforced with shrink-fitted or press-fitted parts, and is therefore prone to deformation due to the internal pressure of the casing (10) (pressure of the discharged refrigerant). A third projection (93) is provided in this area. At the location where the third projection (93) is fixed to the casing (10), when the casing body (11) attempts to deform outward, a load is also applied to the third projection (93), and the deformation is suppressed by the resulting stress. Therefore, according to the ninth embodiment, deformation of the casing (10) can be more effectively suppressed in a compressor (1) in which compressed refrigerant is discharged into the casing (10).

[0025] A tenth aspect of this disclosure is, in the eighth aspect, A fourth projection (94) extending in a direction intersecting the circumferential direction of the casing body (11) is fixed between the annular second region (A2) corresponding to the stator (21) and the first region (A1) on the outer circumferential surface of the casing body (11). It is a compressor.

[0026] In the tenth embodiment, the area between the annular second region (A2) corresponding to the stator (21) and the first region (A1) corresponding to the compression mechanism (30) on the outer circumferential surface of the casing body (11) is not reinforced with shrink-fitted or press-fitted parts, and is therefore prone to deformation due to the internal pressure of the casing (10) (pressure of the discharged refrigerant). A fourth projection (94) is provided in this area. At the location where the fourth projection (94) is fixed in the casing (10), when the casing body (11) attempts to deform outward, a load is also applied to the fourth projection (94), and the deformation is suppressed by the resulting stress. Therefore, according to the tenth embodiment, deformation of the casing (10) can be more effectively suppressed in a compressor (1) in which compressed refrigerant is discharged into the casing (10).

[0027] The eleventh aspect of this disclosure is, in accordance with the first to third aspects, The height of the first projection (91) described above is longer than its width. It is a compressor.

[0028] A twelfth aspect of this disclosure is, in accordance with the fourth to seventh aspects, The height of the second projection (92) described above is longer than its width. It is a compressor.

[0029] In the 11th and 12th embodiments, the first and second projections (91, 92) are configured such that their radial length is greater than their width relative to the casing body (11). This increases the stress generated at the first and second projections (91, 92) when the casing body (11) attempts to deform outward. As a result, deformation of the casing (10) can be suppressed more effectively.

[0030] A thirteenth aspect of this disclosure is a refrigeration cycle system comprising a compressor according to any one of the first to twelfth aspects. [Brief explanation of the drawing]

[0031] [Figure 1] Figure 1 is a piping diagram of the refrigeration cycle system of Embodiment 1. [Figure 2] Figure 2 is a longitudinal cross-sectional view of the compressor of Embodiment 1. [Figure 3] Figure 3 is a cross-sectional view of the motor portion of the compressor in Embodiment 1. [Figure 4] Figure 4 is a cross-sectional view taken along the line IV-IV in Figure 2. [Figure 5] Figure 5 is a perspective view of the casing of the compressor according to Embodiment 1. [Figure 6] Figure 6 is a longitudinal cross-sectional view of the compressor of Embodiment 2. [Figure 7] Figure 7 is a longitudinal cross-sectional view of the compressor of Embodiment 3. [Figure 8] Figure 8 shows the positions of the welds and ribs in the compressor of Embodiment 3. [Figure 9] Figure 9 is a longitudinal cross-sectional view of the compressor of Embodiment 4. [Modes for carrying out the invention]

[0032] Embodiment 1 Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses. Furthermore, the embodiments, modifications, and other examples described below can be combined or partially replaced to the extent that the present invention is implementable. "Top" and "bottom" refer to the direction when the compressor (1) is viewed from the front (see Figure 2). Also, hatching may be omitted in the figures to facilitate understanding of the explanation.

[0033] (1) Refrigeration cycle equipment As shown in Figure 1, the compressor (1) in this example is applied to a refrigeration cycle device (100). Hereafter, the compressor (1) may be simply referred to as compressor (1). The refrigeration cycle device (100) is, for example, an air conditioning system that provides air conditioning for a room.

[0034] The refrigeration cycle device (100) has an outdoor unit (7) located outside and an indoor unit (8) located inside. The outdoor unit (7) is equipped with a compressor (1), an accumulator (2), a four-way switching valve (3), an outdoor heat exchanger (4), and an expansion valve (5). The indoor unit (8) is equipped with an indoor heat exchanger (6).

[0035] The refrigeration cycle device (100) includes a refrigerant circuit (9). A compressor (1), a four-way switching valve (3), an outdoor heat exchanger (4), an expansion valve (5), and an indoor heat exchanger (6) are connected to the refrigerant circuit (9). The refrigeration cycle is performed by the flow of refrigerant through the refrigerant circuit (9). The refrigerant can be any type that can perform the refrigeration cycle in the refrigerant circuit (9), but in Embodiment 1, carbon dioxide refrigerant is used.

[0036] The refrigeration cycle device (100) performs heating and cooling operations by switching the four-way switching valve (3). In cooling operation, the first refrigeration cycle is performed. Specifically, when the first port (p1) and the third port (p3) of the four-way switching valve (3) are in communication, and the second port (p2) and the fourth port (p4) are in communication (solid line in Figure 1), the indoor heat exchanger (6) functions as an evaporator and the outdoor heat exchanger (4) functions as a radiator. In heating operation, the second refrigeration cycle is performed. Specifically, when the first port (p1) and the fourth port (p4) of the four-way switching valve (3) are in communication, and the second port (p2) and the third port (p3) are in communication (dashed line in Figure 1), the indoor heat exchanger (6) functions as a radiator and the outdoor heat exchanger (4) functions as an evaporator.

[0037] (2) Compressor As shown in Figure 2, in Embodiment 1, a rotary compressor is described as an example of the compressor (1) of the present disclosure, but the compressor (1) of the present disclosure is not limited to a rotary compressor.

[0038] The compressor (1) comprises a casing (10), a drive shaft (70), a motor (20), and a compression mechanism (30). The drive shaft (70), motor (20), and compression mechanism (30) are housed within the casing (10). The compressor (1) is configured as a so-called high-pressure dome type, in which the refrigerant compressed in the compression mechanism (30) is discharged into the internal space (60) of the casing (10), and the internal space (60) becomes high-pressure.

[0039] (2-1) Casing The casing (10) is formed in an elongated shape. Specifically, the casing (10) comprises a cylindrical body (casing body) (11) extending in the vertical direction, an upper end plate (end plate) (12) that closes the upper end of the body (11), and a lower end plate (end plate) (13) that closes the lower end of the body (11). The upper end plate (12) and the lower end plate (13) are formed to be relatively thick. An intake pipe (14) is inserted through the lower part of the body (11), and a discharge pipe (15) is inserted through the upper part of the body (11).

[0040] (2-2) Drive shaft The drive shaft (70) is positioned to extend vertically within the casing (10). The upper part of the drive shaft (70) is connected to the rotor (22) of the motor (20), which will be described later. The lower part of the drive shaft (70) has, from top to bottom, an upper main shaft portion (71), an eccentric portion (72), and a lower main shaft portion (73). The upper main shaft portion (71) and the lower main shaft portion (73) have their axes aligned. The eccentric portion (72) is formed to have a larger diameter than the upper main shaft portion (71) and the lower main shaft portion (73), and is eccentric with respect to the axes of the upper main shaft portion (71) and the lower main shaft portion (73). A roller (35) of the compression mechanism (30), which will be described later, is connected to the eccentric portion (72). The drive shaft (70) is driven by the motor (20) and causes the roller (35) to rotate eccentrically.

[0041] (2-3) Motor The motor (20) is housed in the casing (10) and drives the drive shaft (70). The motor (20) is positioned above the compression mechanism (30) within the casing (10). The motor (20) has a cylindrical stator (21) along the inner circumferential surface of the body (11) and a rotor (22) positioned inside the stator (21). As will be described in detail later, the motor (20) is welded to the body (11) of the casing (10) at a height midway up the vertical direction within the casing (10).

[0042] As shown in Figure 3, the stator (21) has a stator core (23) and a coil (not shown). The stator core (23) has a cylindrical core back (23a) and a plurality of teeth (9 in this embodiment 1) protruding radially inward from the inner circumferential surface of the core back (23a). A plurality of core cuts (9 in this embodiment 1) are formed on the outer circumference of the core back (23a) to correspond to each tooth (23b). The core cuts (23c) are formed by cutting out a notch from the upper end surface to the lower end surface of the stator core (23), and connect the space above and below the motor (20) inside the casing (10). The core back (23a) has nine outwardly protruding projections (23d) formed by nine core cuts (23c, ..., 23c), and the nine projections (23d, ..., 23d) abut against the inner circumferential surface of the body (11) of the casing (10). A coil (not shown) is wound around each tooth (23b).

[0043] The rotor (22) has a cylindrical rotor core (24) and permanent magnets (not shown). The rotor core (24) is fixed to the top of the drive shaft (70) and is positioned inside the stator core (23) with a gap. The rotor (22) rotates by magnetic interaction with the stator (21), causing the drive shaft (70) to rotate.

[0044] (2-4) Compression mechanism As shown in Figure 2, the compression mechanism (30) is housed within the casing (10). The compression mechanism (30) compresses the inhaled refrigerant and discharges it into the internal space (60) of the casing (10). The compression mechanism (30) comprises a cylinder (34), rollers (35), vanes (not shown), a front head (41), a rear head (42), and a mounting plate (44). In the compression mechanism (30), the front head (41), cylinder (34), and rear head (42) are stacked from top to bottom and fixed with bolts, etc., and the mounting plate (44) is fixed to the front head (41) with bolts. As will be described in more detail later, the compression mechanism (30) is welded to the body (11) of the casing (10) below the motor (20).

[0045] The cylinder (34) is formed in a substantially cylindrical shape. The cylinder (34) has an intake port (55) which is a hole that extends radially and penetrates from the inside to the outside, and an intake pipe (14) is connected to the intake port (55). A roller (35) is housed inside the cylinder (34).

[0046] The roller (35) has the eccentric portion (72) of the drive shaft (70) fitted inside it. When the drive shaft (70) rotates, the roller (35) rotates eccentrically within the cylinder (34) and revolves along the inner circumferential surface of the cylinder (34). As a result, the volume of the low-pressure chamber and the high-pressure chamber in the cylinder chamber (S) formed between the cylinder (34) and the roller (35) fluctuates, and the refrigerant is compressed.

[0047] As shown in Figure 2, the front head (41) has a thick-walled disc-shaped first main body portion (41a) and a cylindrical upper bearing portion (41b). The front head (41) closes the upper open end face of the cylinder (34) with the first main body portion (41a) and rotatably supports the upper main shaft portion (71) of the drive shaft (70) with the upper bearing portion (41b). The front head (41) has a discharge port (26) formed therein for discharging the refrigerant compressed in the cylinder chamber (S) into the casing (10).

[0048] The rear head (42) has a thick, disc-shaped second main body (42a) and a cylindrical lower bearing portion (42b). The rear head (42) closes the lower open end face of the cylinder (34) with the second main body (42a) and rotatably supports the lower main shaft portion (73) of the drive shaft (70) with the lower bearing portion (42b).

[0049] As shown in Figures 2 and 4, the mounting plate (44) has an upper plate portion (44a) provided on the first main body portion (41a) of the front head (41), and six side plate portions (44b) that extend downward in conjunction with the upper plate portion (44a). The upper plate portion (44a) is formed of a disc-shaped member with a circular hole formed in the center, and six notches are formed at equal intervals on its outer circumference. The six side plate portions (44b) are continuous with the outer circumference ends of the portions between each of the six notches and extend downward along the inner circumferential surface of the casing (10).

[0050] The compression mechanism (30) is configured as described above. The cylinder (34), roller (35), and vane (not shown) constitute the compression section of the present disclosure, which compresses the refrigerant and discharges it into the casing (10). The front head (41) and rear head (42) constitute bearings fixed to the compression section and supporting the drive shaft (70).

[0051] (3) Welded parts (3-1) First weld As described above, the compression mechanism (30) is welded to the body (11) of the casing (10). In this embodiment 1, the mounting plate (44) is welded to the body (11) of the casing (10), thereby welding the compression mechanism (30) to the body (11) of the casing (10).

[0052] As shown in Figure 4, the mounting plate (44) is fixed to the body (11) of the casing (10) by welding at a plurality of first welds (81) arranged circumferentially on the body (11) of the casing (10). The first welds (81) are formed by spot welding. In this embodiment 1, one first weld (81) is provided at each of the six circumferential locations of the mounting plate (44). Specifically, as shown in Figure 4, the first welds (81) are formed by spot welding between each of the six side plate portions (44b) of the mounting plate (44) and the body (11) of the casing (10).

[0053] The six first welds (81) are positioned at approximately the same height on the body (11) of the casing (10). The six first welds (81) are spaced equally in the circumferential direction of the body (11) of the casing (10), that is, at 60° intervals around the axis of the body (11).

[0054] (3-2) Second weld As described above, the motor (20) is welded to the body (11) of the casing (10). In this embodiment 1, the motor (20) is welded to the body (11) of the casing (10) by welding the stator (21) to the body (11) of the casing (10).

[0055] As shown in Figure 3, the stator (21) is welded to the body (11) of the casing (10) by a plurality of second welds (82) arranged circumferentially on the body (11) of the casing (10). The second welds (82) are formed by spot welding. In this embodiment 1, as shown in Figures 2 and 3, a total of six second welds (82) are provided at three locations in the circumferential direction of the stator (21), two above and two below each location. Specifically, two second welds (82) are formed by spot welding between each of the three projections (23d, 23d, 23d) of the nine projections (23d, ..., 23d) on the outer circumference of the core back (23a) of the stator (21) and the body (11) of the casing (10).

[0056] The three second welds (82) located on the upper part of the three protruding parts (23d, 23d, 23d) are positioned at approximately the same height on the body (11) of the casing (10). Similarly, the three second welds (82) located on the lower part of the three protruding parts (23d, 23d, 23d) are positioned at approximately the same height on the body (11) of the casing (10). Each of the three second welds (82) located at the same height is positioned at equal intervals in the circumferential direction of the body (11) of the casing (10), that is, at 120° intervals around the axis of the body (11). Furthermore, as shown in Figure 5, the six second welds (82) are positioned circumferentially offset from the six first welds (81).

[0057] (4) Ribs In the compressor (1) described above, the refrigerant compressed in the compression section of the compression mechanism (30) is discharged into the casing (10). Therefore, in the compressor (1), there is a risk that the casing (10) may deform outward (bulge) due to the pressure of the discharged refrigerant (high pressure). At that time, the first welded section (81) and the second welded section (82) of the casing (10) to which the compression mechanism (30) and motor (20) are welded do not deform because the pressure of the discharged refrigerant does not act on them. Therefore, in the compressor (1), the parts of the casing (10) other than the first and second welded sections (81, 82) deform due to the pressure of the discharged refrigerant, causing large stress to act on the first and second welded sections (81, 82). Therefore, in this embodiment 1, ribs (91, 92) are provided on the outer circumferential surface of the casing (10) to suppress deformation of the casing (10) and reduce the stress acting on the first and second welded sections (81, 82).

[0058] (4-1) 1st Rib As shown in Figures 2, 4, and 5, in the compressor (1) described above, in order to reduce the stress acting on the first weld (81), a first rib (first projection) (91) extending in a direction intersecting the circumferential direction of the body (11) is fixed to the outer circumferential surface of the body (11) of the casing (10). In Embodiment 1, the first rib (91) is provided so as to extend in an axial direction perpendicular to the circumferential direction of the body (11). As shown in Figure 4, the first rib (91) is provided between two adjacent first welds (81) in the circumferential direction in a plan view. In Embodiment 1, in a plan view, the first rib (91) is provided between three of the six first welds (81).

[0059] Furthermore, the first rib (91) is effective if it is provided in at least one of the six first welds (81). The number of first ribs (91) is not limited to one or three, and may be provided in two, four or five of the six spaces between the six first welds (81), or in each space (all spaces) between the six first welds (81).

[0060] Furthermore, in Embodiment 1, the first rib (91) is provided at an intermediate position between two adjacent first welds (81) that sandwich the first rib (91) in a plan view. However, the circumferential installation position of the first rib (first projection) (91) in this disclosure is not limited to an intermediate position between two adjacent first welds (81) that sandwich the first rib (91), but may be provided between two adjacent first welds (81).

[0061] The first rib (91) is provided such that at least a portion of it is located in an annular first region (A1) corresponding to the compression mechanism (30) on the outer circumferential surface of the body (11) in the axial direction (vertical direction) of the body (11). Furthermore, the first rib (91) is provided such that it is located on a first line (L1) connecting the six first welds (81) on the outer circumferential surface of the body (11).

[0062] As shown in Figure 2, in Embodiment 1, on the outer circumferential surface of the body portion (11) of the casing (10), the annular region between the upper end of the first main body portion (41a) of the front head (41) and the lower end of the rear head (42) in the vertical direction is defined as the first region (A1). The first rib (91) is formed to extend from the upper end to the lower end of the first region (A1). Therefore, in Embodiment 1, the first rib (91) is provided so as to intersect with the first line (L1) that connects the six first welds (81) on the outer circumferential surface of the body portion (11).

[0063] The first rib (91) is fixed to the outer circumferential surface of the body (11) of the casing (10) by welding. The first rib (91) is formed in a rectangular cross-section. In the plan view shown in Figure 4, the first rib (91) is formed such that its height (the distance between the proximal end face facing the casing (10) and its opposing distal end face; in Embodiment 1, the radial length of the body (11) of the casing (10)) h1 is longer than its width (the length in the width direction perpendicular to the height direction) b1 (h1 > b1). In Embodiment 1, h1 is 15 mm and b1 is 5 mm. In Embodiment 1, the first rib (91) is provided so that its height direction coincides with the radial direction of the body (11) of the casing (10), but its height direction may be inclined with respect to the radial direction of the body (11) of the casing (10).

[0064] (4-2) Second Rib As shown in Figures 2, 3, and 5, in the compressor (1) described above, in order to reduce the stress acting on the second weld (82), a second rib (second projection) (92) extending in a direction intersecting the circumferential direction of the body (11) is fixed to the outer circumferential surface of the body (11) of the casing (10). In Embodiment 1, the second rib (92) is provided so as to extend in an axial direction perpendicular to the circumferential direction of the body (11). As shown in Figure 3, the second rib (92) is provided between two circumferentially adjacent second welds (82) in a plan view. In Embodiment 1, in a plan view, the second rib (92) is provided between each of the three circumferentially aligned second welds (82).

[0065] Furthermore, the second rib (92) is effective if it is provided in at least one of the three second welds (82) that are arranged in the circumferential direction. The number of second ribs (92) is not limited to one or three, and may be provided in two of the three spaces between the three second welds (82).

[0066] Furthermore, in Embodiment 1, the second rib (92) is provided at an intermediate position between two adjacent second welds (82) that sandwich the second rib (92) in a plan view. However, the circumferential installation position of the second rib (second projection) (92) in this disclosure is not limited to an intermediate position between two adjacent second welds (82) that sandwich the second rib (92), but may be provided between two adjacent second welds (82).

[0067] The second rib (92) is positioned such that at least a portion of it is located in an annular second region (A2) on the outer circumferential surface of the shell (11) that corresponds to the stator (21) in the axial direction (vertical direction) of the shell (11). Furthermore, the second rib (92) is positioned on at least one of two second lines (L2) that connect the three upper and three lower second welds (82) that are arranged circumferentially on the outer circumferential surface of the shell (11).

[0068] As shown in Figure 2, in Embodiment 1, the annular region between the upper and lower ends of the stator (21) in the vertical direction on the outer circumferential surface of the body portion (11) of the casing (10) is defined as the second region (A2). The second rib (92) is formed to extend from the upper end to the lower end of the second region (A2). Therefore, in Embodiment 1, the second rib (92) is provided so as to intersect with both of the two second lines (L2) that connect the three upper and three lower second welds (82) that are arranged circumferentially on the outer circumferential surface of the body portion (11).

[0069] The second rib (92) is fixed to the outer circumferential surface of the body portion (11) of the casing (10) by welding. The second rib (92) is formed in a rectangular cross-section. In the plan view shown in Figure 3, the second rib (92) is formed such that the height of the casing (10) (the distance between the proximal end face facing the casing (10) and the distal end face opposite it; in Embodiment 1, the radial length of the body portion (11)) h2 is longer than the width (the length in the width direction perpendicular to the height direction) b2 (h2 > b2). In Embodiment 1, h2 is formed to be 15 mm and b2 to be 5 mm. In Embodiment 1, the second rib (92) is provided so that its height direction coincides with the radial direction of the body portion (11) of the casing (10), but its height direction may be inclined with respect to the radial direction of the body portion (11) of the casing (10).

[0070] (4-3) Action by the ribs When the compressed refrigerant in the compression section of the compression mechanism (30) is discharged into the casing (10), the pressure of the discharged refrigerant (high pressure) acts on the body (11) in a direction that causes it to deform outward (expand). The first and second welds (81, 82) do not deform because the pressure of the discharged refrigerant does not act on them, and the parts of the body (11) other than the first and second welds (81, 82) attempt to deform.

[0071] However, in Embodiment 1, a first rib (91) is provided on the outer circumferential surface of the shell (11) at a location that is easily deformed by the pressure of the discharged refrigerant, that is, between two circumferentially adjacent first welds (81). Therefore, when the shell (11) attempts to deform, a load is also applied to the first rib (91), generating stress. This stress on the first rib (91) suppresses the deformation of the shell (11), resulting in no deformation at all or only a small deformation (bulging). As a result, the stress acting on the first welds (81) provided on both sides of the first rib (91) is reduced.

[0072] Furthermore, in Embodiment 1, a second rib (92) is provided on the outer circumferential surface of the shell (11) at a location that is easily deformed by the pressure of the discharged refrigerant, that is, between two adjacent second welds (82) in the circumferential direction. Therefore, when the shell (11) attempts to deform, a load is also applied to the second rib (92), generating stress. This stress on the second rib (92) suppresses the deformation of the shell (11), resulting in no deformation at all, or if deformation occurs, the deformation (bulging) is reduced. As a result, the stress acting on the second welds (82) provided on both sides of the second rib (92) is reduced.

[0073] -Effects of Embodiment 1- In the compressor (1) of this embodiment 1, a first rib (91) is provided on the outer circumferential surface of the body (11) between a plurality of first welds (81) for fixing the compression mechanism (30) to the body (11), and extending in a direction intersecting the circumferential direction of the body (11). In other words, in embodiment 1, the first rib (91) is provided in the part between the first welds (81) that are easily deformed by the internal pressure (pressure of the discharged refrigerant) of the casing (10). At the location where the first rib (91) is fixed in the casing (10), when the casing body (11) tries to deform outward, a load is also applied to the first rib (91), and the deformation is suppressed by the stress. Therefore, according to embodiment 1, in a compressor (1) in which compressed refrigerant is discharged into the casing (10), deformation of the casing (10) can be effectively suppressed. As a result, the stress acting on the first and second welds (81, 82) of the casing (10) can be reduced.

[0074] Furthermore, in this embodiment 1, the first rib (91) is provided in the annular first region (A1) corresponding to the compression mechanism (30) on the outer circumferential surface of the body (11). With this configuration, the first rib (91) is provided near the welding point of the compression mechanism (30), i.e., the first weld (81). In other words, when the casing (10) is about to deform due to the pressure of the discharged refrigerant, the first rib (91) is provided in the part where the deformation (bulging) is greatest. Therefore, with the above configuration, the deformation of the casing (10) can be suppressed more effectively.

[0075] Furthermore, in this embodiment 1, the first rib (91) is positioned on a first line (L1) that connects a plurality of first welds (81) arranged circumferentially on the outer surface of the body (11). The first line (L1) is a part that is easily deformed by the internal pressure of the casing (10) (pressure of the discharged refrigerant), but by providing the first rib (91) on the first line (L1), deformation of the casing (10) can be suppressed more effectively.

[0076] Furthermore, in this embodiment 1, a second rib (92) is provided on the outer circumferential surface of the casing (10) between a plurality of second welds (82) for fixing the motor (20) to the body (11) of the casing (10), extending in a direction intersecting the circumferential direction of the body (11). In other words, the second rib (92) is provided not only in the part between the first welds (81) which are easily deformed by the internal pressure (pressure of the discharged refrigerant) of the casing (10), but also in the part between the second welds (82). At the location where the second rib (92) is fixed to the casing (10), when the body (11) tries to deform outward, a load is also applied to the second rib (92), and the deformation is suppressed by the resulting stress. Therefore, according to embodiment 1, even in a compressor (1) in which not only the compression mechanism (30) but also the motor (20) is fixed to the casing (10) by welding, deformation of the casing (10) can be effectively suppressed. As a result, not only the stress acting on the first weld (81) of the casing (10) but also the stress acting on the second weld (82) can be reduced.

[0077] Furthermore, in this embodiment 1, the second rib (92) is provided in the annular second region (A2) on the outer circumferential surface of the body (11) corresponding to the stator (21) of the motor (20). With this configuration, the second rib (92) is provided near the welding point of the motor (20), i.e., the second weld (82). In other words, when the casing (10) is about to deform due to the pressure of the discharged refrigerant, the second rib (92) is provided in the part where the deformation (bulging) is greatest. Therefore, with the above configuration, the deformation of the casing (10) can be suppressed more effectively.

[0078] Furthermore, in this embodiment 1, the second rib (92) is positioned on a second line (L2) that connects a plurality of second welds (82) arranged circumferentially on the outer surface of the body (11). The second line (L2) is a part that is easily deformed by the internal pressure of the casing (10) (pressure of the discharged refrigerant), but by providing the second rib (92) on the second line (L2), deformation of the casing (10) can be suppressed more effectively.

[0079] Furthermore, in this embodiment 1, the first rib (91) and the second rib (92) are provided at positions offset in the circumferential direction. With this configuration, there are many areas in the circumferential direction of the body (11) that are reinforced by the first and second ribs (91, 92) and deformation is suppressed. Therefore, according to this embodiment 1, deformation of the casing (10) can be suppressed more effectively.

[0080] Furthermore, in this embodiment 1, the height h1 of the first rib (91) is formed to be longer than the width b1. Similarly, the height h2 of the second rib (92) is formed to be longer than the width b2. With this configuration, the stress generated in the first and second ribs (91, 92) becomes larger when the body (11) tries to deform outward. Therefore, the deformation of the casing (10) can be suppressed more effectively.

[0081] Embodiment 2 Embodiment 2 is a modified version of Embodiment 1 in which the compressor (1) has been partially altered. Specifically, in the compressor (1) of Embodiment 2, the stator (21) of the motor (20) is fixed to the body (11) of the casing (10) by shrink fitting rather than welding. Therefore, as shown in Figure 6, the compressor (1) of Embodiment 2 does not have a second welded joint (82).

[0082] As the stator (21) is shrink-fitted into the body (11) in this manner, the portion of the body (11) corresponding to the stator (21) is reinforced by the stator (21), making it less susceptible to deformation due to the internal pressure of the casing (10) (pressure of the discharged refrigerant). For this reason, the compressor (1) of Embodiment 2 does not have a second rib (92).

[0083] On the other hand, in the compressor (1) of Embodiment 2, the side of the outer circumferential surface of the body portion (11) of the casing (10) opposite the compression mechanism (30) (the upper side of the second region (A2) in Figure 6) is not reinforced by the shrink-fitted stator (21), and is therefore a part that is easily deformed by the internal pressure of the casing (10) (pressure of the discharged refrigerant). For this reason, in Embodiment 2, in order to suppress deformation of the upper part of the second region (A2), a third rib (third projection) (93) extending in a direction intersecting the circumferential direction of the body portion (11) is fixed to the upper side of the second region (A2) on the outer circumferential surface of the body portion (11) of the casing (10). In Embodiment 2, the third rib (93) is provided so as to extend in an axial direction perpendicular to the circumferential direction of the body portion (11). Furthermore, in Embodiment 2, four third ribs (93) are provided and arranged at equal intervals in the circumferential direction. Note that the effect is achieved even if at least one third rib (93) is provided, and the effect is achieved even if they are not arranged at equal intervals.

[0084] The third rib (93) is formed to a length such that its upper end is located near the upper end plate (12) of the upper end of the body (11) and its lower end is located near the upper end of the second region (A2). The third rib (93) is fixed to the outer circumferential surface of the body (11) of the casing (10) by welding. The third rib (93) is formed in a rectangular cross-section. The third rib (93) is formed such that its height (the distance between the proximal end face facing the casing (10) and its opposing distal end face; in Embodiment 2, the radial length of the body (11) of the casing (10)) h3 is greater than its width (the length in the width direction perpendicular to the height direction) b3 (h3 > b3). In Embodiment 2, h3 is formed to be 15 mm and b3 to be 5 mm. In Embodiment 2, the third rib (93) is provided such that its height direction coincides with the radial direction of the body portion (11) of the casing (10), but its height direction may be inclined with respect to the radial direction of the body portion (11) of the casing (10).

[0085] Furthermore, in the compressor (1) of Embodiment 2, the area between the annular second region (A2) corresponding to the stator (21) and the first region (A1) corresponding to the compression mechanism (30) on the outer circumferential surface of the body portion (11) of the casing (10) is not reinforced by the shrink-fitted stator (21), and is therefore a part that is easily deformed by the internal pressure of the casing (10) (pressure of the discharged refrigerant). For this reason, in Embodiment 2, in order to suppress deformation (bulging) of the area between the first region (A1) and the second region (A2), a fourth rib (fourth projection) (94) extending in a direction intersecting the circumferential direction of the body portion (11) is fixed between the first region (A1) and the second region (A2) on the outer circumferential surface of the body portion (11) of the casing (10). In Embodiment 2, the fourth rib (94) is provided so as to extend in an axial direction perpendicular to the circumferential direction of the body portion (11). Furthermore, in Embodiment 2, four fourth ribs (94) are provided and arranged at equal intervals in the circumferential direction. Note that the effect is achieved even if at least one fourth rib (94) is provided, and the effect is also achieved even if they are not arranged at equal intervals.

[0086] The fourth rib (94) is formed to a length such that its upper end is located near the lower end of the second region (A2) and its lower end is located near the upper end of the first region (A1). The fourth rib (94) is fixed to the outer circumferential surface of the body portion (11) of the casing (10) by welding. The fourth rib (94) is formed in a rectangular cross-section. The fourth rib (94) is formed such that its height (the distance between the proximal end face facing the casing (10) and its opposing distal end face; in Embodiment 2, the radial length of the body portion (11) of the casing (10)) h4 is greater than its width (the length in the width direction perpendicular to the height direction) b4 (h4 > b4). In Embodiment 2, h4 is formed to be 15 mm and b4 to be 5 mm. In Embodiment 2, the fourth rib (94) is provided such that its height direction coincides with the radial direction of the body portion (11) of the casing (10), but its height direction may be inclined with respect to the radial direction of the body portion (11) of the casing (10).

[0087] The other components are the same as in Embodiment 1, so a detailed explanation will be omitted. Furthermore, Embodiment 2 can achieve the same effects as Embodiment 1.

[0088] Furthermore, according to Embodiment 2, the stator (21) is fixed to the body portion (11) of the casing (10) by shrink-fitting. As a result, the portion of the body portion (11) corresponding to the stator (21) is reinforced by the stator (21), making it less susceptible to deformation due to the internal pressure of the casing (10) (pressure of the discharged refrigerant). Thus, according to Embodiment 2, deformation of the casing (10) can be easily suppressed.

[0089] Furthermore, in Embodiment 2, the outer circumferential surface of the body portion (11) of the casing (10) opposite the compression mechanism (30) across the annular second region (A2) corresponding to the stator (21) is not reinforced by the shrink-fitted stator (21), and is a part that is easily deformed by the internal pressure of the casing (10) (pressure of the discharged refrigerant). Therefore, a third rib (93) is provided in this part. At the location where the third rib (93) is fixed in the casing (10), when the body portion (11) tries to deform outward, a load is also applied to the third rib (93), and the deformation is suppressed by the resulting stress. Accordingly, according to Embodiment 2, in a compressor (1) in which compressed refrigerant is discharged into the casing (10), deformation of the casing (10) can be suppressed more effectively.

[0090] Furthermore, in Embodiment 2, the area between the annular second region (A2) corresponding to the stator (21) and the first region (A1) corresponding to the compression mechanism (30) on the outer circumferential surface of the body portion (11) of the casing (10) is not reinforced by the shrink-fitted stator (21), and is a part that is easily deformed by the internal pressure of the casing (10) (pressure of the discharged refrigerant). Therefore, a fourth rib (94) is provided in this area. At the location where the fourth rib (94) is fixed in the casing (10), when the body portion (11) tries to deform outward, a load is also applied to the fourth rib (94), and the deformation is suppressed by the resulting stress. Accordingly, according to Embodiment 2, in a compressor (1) in which compressed refrigerant is discharged into the casing (10), deformation of the casing (10) can be suppressed more effectively.

[0091] Modification 1 of Embodiment 2 Modification 1 of Embodiment 2 involves a partial modification of the compressor (1) in Embodiment 2. Specifically, in Modification 1 of Embodiment 2, the stator (21) of the motor (20) is fixed to the body (11) of the casing (10) by press-fitting, rather than by shrink-fitting. The other configurations are the same as in Embodiment 2. And the same effects as in Embodiment 2 can be achieved.

[0092] Embodiment 3 Embodiment 3 is a modification of Embodiment 1 in which the compressor (1) is replaced with a scroll compressor.

[0093] (1) Refrigeration cycle equipment The refrigeration cycle device (100) to which the compressor (1) of Embodiment 3 is applied is, Since it is similar to the refrigeration cycle device (100) in 1, a detailed explanation is omitted.

[0094] (2) Compressor As shown in Figure 7, the compressor (1) comprises a casing (10), a drive shaft (70), a motor (20), a compression mechanism (30), and a lower bearing section (50). The drive shaft (70), motor (20), compression mechanism (30), and lower bearing section (50) are housed within the casing (10). The compressor (1) is configured as a so-called high-pressure dome type, where the refrigerant compressed in the compression mechanism (30) is discharged into the internal space (60) of the casing (10), and the internal space (60) becomes high-pressure.

[0095] (2-1) Casing The casing (10) is formed in an elongated shape. Specifically, the casing (10) comprises a cylindrical body (casing body) (11) extending in the vertical direction, an upper end plate (end plate) (12) that closes the upper end of the body (11), and a lower end plate (end plate) (13) that closes the lower end of the body (11). The upper end plate (12) and the lower end plate (13) are formed to be relatively thick. An intake pipe (14) is inserted through the upper end plate (12), and a discharge pipe (15) is inserted through the upper part of the body (11).

[0096] (2-2) Drive shaft The drive shaft (70) is positioned to extend vertically within the casing (10). The drive shaft (70) has a main shaft portion (71) and an eccentric portion (72). The main shaft portion (71) is provided inside the body portion (11) of the cylindrical casing (10) so that their central axes coincide. The rotor (22) of the motor (20) is fixed to the middle portion of the main shaft portion (71) in the vertical direction. The eccentric portion (72) is formed above the main shaft portion (71). The eccentric portion (72) is formed to have a larger diameter than the main shaft portion (71) and is eccentric with respect to the axis of the main shaft portion (71). The movable scroll (38) of the compression mechanism (30), which will be described later, is connected to the eccentric portion (72). The drive shaft (70) is driven by the motor (20) to eccentrically rotate the movable scroll (38).

[0097] (2-3) Motor The motor (20) is housed in the casing (10) and drives the drive shaft (70). The motor (20) is located below the compression mechanism (30) within the casing (10). Similar to Embodiment 1, the motor (20) has a cylindrical stator (21) along the inner circumferential surface of the body (11) and a rotor (22) located inside the stator (21). As will be described in detail later, the motor (20) is welded to the body (11) of the casing (10) at a height midway in the vertical direction within the casing (10). The other components of the motor (20) are configured the same as those of the compressor (1) in Embodiment 1.

[0098] (2-4) Compression mechanism The compression mechanism (30) includes a housing (36), a fixed scroll (37), and a movable scroll (38). As will be described in detail later, the compression mechanism (30) is welded to the body (11) of the casing (10) above the motor (20).

[0099] The housing (36) has a main body (36a) and a bearing portion (36b). The main body (36a) is formed in the shape of a thick disc, with a recess in the center that is recessed downwards. The bearing portion (36b) is a substantially cylindrical portion located below the recess of the main body (36a). A bearing metal (36c) is provided inside the bearing portion (36b), and the upper end of the main shaft portion (71) of the drive shaft (70) is inserted inside the bearing metal (36c).

[0100] A fixed scroll (37) and a movable scroll (38) are mounted on the housing (36). The fixed scroll (37) is fixed to the housing (36) by bolts or the like. An intake pipe (14) is provided so as to pass through the fixed scroll (37). On the other hand, the movable scroll (38) is engaged with the housing (36) via an Oldham coupling (39). The eccentric portion (72) of the drive shaft (70) is fitted into the lower end of the movable scroll (38).

[0101] The fixed scroll (37) and the movable scroll (38) mesh together, forming a compression chamber (Sc) between them. The movable scroll (38) revolves around the central axis of the drive shaft (70) as the drive shaft (70) rotates. This causes the volume of the compression chamber (Sc) to fluctuate, and the refrigerant drawn into the compression chamber (Sc) via the suction pipe (14) is compressed.

[0102] The upper part of the fixed scroll (37) is partitioned into a muffler space (40) through which the refrigerant compressed in the compression chamber (Sc) is discharged. The muffler space (40) is connected to the space below the motor (20) in the casing (10) via a discharge passage (not shown). As a result, the refrigerant compressed in the compression chamber (Sc) of the compression mechanism (30) is discharged into the space below the motor (20) in the casing (10).

[0103] The compression mechanism (30) is configured as described above. The fixed scroll (37) and the movable scroll (38) constitute the compression section of this disclosure, which compresses the refrigerant and discharges it into the casing (10). The housing (36) is fixed to the compression section and constitutes a bearing that supports the drive shaft (70).

[0104] The lower bearing portion (50) has a bearing body portion (51) and a fixing portion (52). The bearing body portion (51) is a portion formed in a substantially cylindrical shape. A bearing metal (51a) is provided inside the bearing body portion (51), and the lower end of the main shaft portion (71) of the drive shaft (70) is inserted inside the bearing metal (51a). The fixing portion (52) is a portion that extends radially outward from the outer circumference of the bearing body portion (51) to the inner circumferential surface of the body portion (11) of the casing (10) and is fixed to the body portion (11). In this embodiment 3, three fixing portions (52) are provided. The three fixing portions (52) are arranged at equal intervals in the circumferential direction of the bearing body portion (51), that is, at 120° intervals around the axis of the bearing body portion (51) (the axis of the main shaft portion (71) of the drive shaft (70)). As will be described in more detail later, the lower bearing section (50) is welded and fixed to the body section (11) of the casing (10) below the motor (20).

[0105] (3) Welded parts (3-1) First weld As described above, the compression mechanism (30) is welded to the body (11) of the casing (10). In this embodiment 3, the housing (36) is welded to the body (11) of the casing (10), thereby welding the compression mechanism (30) to the body (11) of the casing (10).

[0106] The housing (36) is fixed to the body portion (11) of the casing (10) by welding to the body portion (11) at a plurality of first welds (81) arranged circumferentially on the body portion (11) of the casing (10). The first welds (81) are formed by spot welding. In this embodiment 3, one first weld (81) is provided at each of the four circumferential locations of the housing (36). Specifically, the first welds (81) are formed by spot welding between the main body portion (36a) of the housing (36) and the body portion (11) of the casing (10).

[0107] As shown by dashed lines in Figure 7, the four first welds (81) are located at approximately the same height on the body (11) of the casing (10). Note that in Figure 7, the dashed lines show the first welds (81) that appear on a cross-section obtained by rotating the cross-section shown in Figure 7 by 45° around the axis of the drive shaft (70). As shown in Figure 8, the four first welds (81) are located at equal intervals in the circumferential direction of the body (11) of the casing (10), that is, at 90° intervals around the axis of the body (11).

[0108] (3-2) Second weld As described above, the motor (20) is welded to the body (11) of the casing (10). In this embodiment 3, the motor (20) is welded to the body (11) of the casing (10) by welding the stator (21) to the body (11) of the casing (10).

[0109] The stator (21) is welded to the body (11) of the casing (10) by a plurality of second welds (82) arranged circumferentially on the body (11) of the casing (10). The second welds (82) are formed by spot welding. In this embodiment 3, as shown in Figures 7 and 8, there are a total of eight second welds (82) at four locations in the circumferential direction of the stator (21), two above and two below each location. As shown in Figure 8, the four upper and four lower second welds (82) arranged circumferentially are positioned at approximately the same height on the body (11) of the casing (10) and are spaced equally in the circumferential direction of the body (11) of the casing (10), that is, at 90° intervals around the axis of the body (11). Furthermore, in Embodiment 3, as shown in Figure 8, the four upper and four lower second welds (82) arranged in the circumferential direction are positioned at the same location in the circumferential direction as the four first welds (81).

[0110] (3-3) Third Weld As described above, the lower bearing portion (50) is welded to the body portion (11) of the casing (10). In this embodiment 3, the lower bearing portion (50) is welded to the body portion (11) of the casing (10) by welding the fixing portion (52) to the body portion (11) of the casing (10).

[0111] The fixing portion (52) is welded to the body portion (11) of the casing (10) by a plurality of third welds (83) arranged circumferentially on the body portion (11) of the casing (10). The third welds (83) are formed by spot welding. In this embodiment 3, as shown in Figures 7 and 8, one third weld (83) is provided at each of the three circumferential locations of the lower bearing portion (50). Specifically, the third welds (83) are formed by spot welding between each of the three fixing portions (52) of the lower bearing portion (50) and the body portion (11) of the casing (10).

[0112] The three third welds (83) are located at approximately the same height on the body (11) of the casing (10). The three third welds (83) are spaced equally in the circumferential direction of the body (11) of the casing (10), that is, at 120° intervals around the axis of the body (11).

[0113] (4) Ribs In the compressor (1) of Embodiment 3, the refrigerant compressed in the compression section of the compression mechanism (30) is discharged into the casing (10). Therefore, in the compressor (1), there is a risk that the casing (10) will deform outward (bulge) due to the pressure of the discharged refrigerant (high pressure). At that time, the first to third welds (81 to 83) to which the compression mechanism (30) and motor (20) of the casing (10) are welded are not affected by the pressure of the discharged refrigerant and therefore do not deform. Therefore, in the compressor (1), the parts of the casing (10) other than the first to third welds (81 to 83) deform due to the pressure of the discharged refrigerant, and a large stress is applied to the first to third welds (81 to 83). Therefore, in this third embodiment, ribs (91, 92) are provided on the outer surface of the casing (10) to suppress deformation of the casing (10) and reduce the stress acting on the first to third welds (81 to 83).

[0114] (4-1) 1st Rib In Embodiment 3, in order to reduce the stress acting on the first weld (81), a first rib (first projection) (91) extending in a direction intersecting the circumferential direction of the body (11) is fixed to the outer circumferential surface of the body (11) of the casing (10). In Embodiment 3, the first rib (91) is provided so as to extend in an axial direction perpendicular to the circumferential direction of the body (11). As shown in Figure 8, the first rib (91) is provided between two adjacent first welds (81) in the circumferential direction in a plan view. In Embodiment 3, in a plan view, the first rib (91) is provided between each of the four first welds (81).

[0115] Furthermore, the first rib (91) is effective if it is provided in at least one of the four first welds (81). The number of first ribs (91) is not limited to one or four, and may be provided in two or three of the four spaces between the four first welds (81).

[0116] Furthermore, in Embodiment 3, the first rib (91) is provided at an intermediate position between two adjacent first welds (81) that sandwich the first rib (91) in a plan view. However, the circumferential installation position of the first rib (first projection) (91) in this disclosure is not limited to an intermediate position between two adjacent first welds (81) that sandwich the first rib (91), but may be provided between two adjacent first welds (81).

[0117] The first rib (91) is provided such that at least a portion of it is located in an annular first region (A1) corresponding to the compression mechanism (30) on the outer circumferential surface of the body (11) in the axial direction (vertical direction) of the body (11). Furthermore, the first rib (91) is provided such that it is located on a first line (L1) connecting the four first welds (81) on the outer circumferential surface of the body (11).

[0118] As shown in Figure 7, in Embodiment 3, on the outer circumferential surface of the body portion (11) of the casing (10), the annular region between the upper end of the body portion (11) and the lower end of the housing (36) in the vertical direction is defined as the first region (A1). The first rib (91) is formed to extend from near the upper end to the lower end of the first region (A1). Therefore, in Embodiment 3, the first rib (91) is provided so as to intersect with the first line (L1) connecting the six first welds (81) on the outer circumferential surface of the body portion (11).

[0119] The first rib (91) is fixed to the outer circumferential surface of the body (11) of the casing (10) by welding. The first rib (91) is formed in a rectangular cross-section. As shown in Figure 8, the first rib (91) is formed such that its height (the distance between the proximal end face facing the casing (10) and its opposing distal end face; in Embodiment 3, the radial length of the body (11) of the casing (10)) h1 is greater than its width (the length in the width direction perpendicular to the height direction) b1 (h1 > b1). In Embodiment 3, h1 is 15 mm and b1 is 5 mm. In Embodiment 3, the first rib (91) is provided so that its height direction coincides with the radial direction of the body (11) of the casing (10), but its height direction may be inclined with respect to the radial direction of the body (11) of the casing (10).

[0120] (4-2) Second Rib In Embodiment 3, in order to reduce the stress acting on the second weld (82), a second rib (second projection) (92) extending in a direction intersecting the circumferential direction of the body (11) is fixed to the outer circumferential surface of the body (10) of the casing (10). In Embodiment 3, the second rib (92) is provided so as to extend in an axial direction perpendicular to the circumferential direction of the body (11). As shown in Figure 8, the second rib (92) is provided between two adjacent second welds (82) in the circumferential direction. In Embodiment 3, a second rib (92) is provided between each of the four second welds (82) that are arranged in the circumferential direction.

[0121] Furthermore, the second rib (92) is effective if it is provided in at least one of the four second welds (82) arranged in the circumferential direction. The number of second ribs (92) is not limited to one or four, and may be provided in two or three of the four spaces between the four second welds (82).

[0122] Furthermore, in Embodiment 3, the second rib (92) is provided at an intermediate position between two adjacent second welds (82) that sandwich the second rib (92) in a plan view. However, the circumferential installation position of the second rib (second projection) (92) in this disclosure is not limited to an intermediate position between two adjacent second welds (82) that sandwich the second rib (92), but may be provided between two adjacent second welds (82).

[0123] The second rib (92) is positioned such that at least a portion of it is located in an annular second region (A2) on the outer circumferential surface of the shell (11) that corresponds to the stator (21) in the axial direction (vertical direction) of the shell (11). Furthermore, the second rib (92) is positioned on at least one of two second lines (L2) that connect the four upper and four lower second welds (82) arranged circumferentially on the outer circumferential surface of the shell (11).

[0124] As shown in Figure 7, in Embodiment 3, the annular region between the upper and lower ends of the stator (21) in the vertical direction on the outer circumferential surface of the body portion (11) of the casing (10) is defined as the second region (A2). The second rib (92) is formed to extend from the upper end to the lower end of the second region (A2). Therefore, in Embodiment 3, the second rib (92) is provided so as to intersect with both of the two second lines (L2) that connect the four upper and four lower second welds (82) that are arranged circumferentially on the outer circumferential surface of the body portion (11).

[0125] The second rib (92) is fixed to the outer circumferential surface of the body (11) of the casing (10) by welding. The second rib (92) is formed in a rectangular cross-section. In the plan view shown in Figure 8, the second rib (92) is formed such that its height (the distance between the proximal end face facing the casing (10) and its opposing distal end face; in Embodiment 3, the radial length of the body (11) of the casing (10)) h2 is greater than its width (the length in the width direction perpendicular to the height direction) b2 (h2 > b2). In Embodiment 3, h2 is formed to be 15 mm and b2 to be 5 mm. In Embodiment 3, the second rib (92) is provided so that its height direction coincides with the radial direction of the body (11) of the casing (10), but its height direction may be inclined with respect to the radial direction of the body (11) of the casing (10).

[0126] (4-3) 5th Rib In Embodiment 3, in order to reduce the stress acting on the third weld (83), a fifth rib (95) is fixed to the outer circumferential surface of the body (11) of the casing (10), extending in a direction intersecting the circumferential direction of the body (11). The fifth rib (95) is provided so as to extend in an axial direction perpendicular to the circumferential direction of the body (11). As shown in Figure 8, the fifth rib (95) is provided between two circumferentially adjacent third welds (83) in a plan view. In Embodiment 3, the fifth rib (95) is provided between each of the three third welds (83) in a plan view.

[0127] Furthermore, the fifth rib (95) is effective if it is provided at least one of the three third welds (83). The number of fifth ribs (95) is not limited to one or three, and may be provided at two of the three third welds (83).

[0128] Furthermore, in Embodiment 3, the fifth rib (95) is located midway between two adjacent third welds (83) that sandwich the fifth rib (95) in a plan view. Note that the circumferential position of the fifth rib (95) is not limited to midway between two adjacent third welds (83) that sandwich the fifth rib (95), but may be located between two adjacent third welds (83).

[0129] The fifth rib (95) is positioned such that at least a portion of it is located in the annular third region (A3) corresponding to the lower bearing portion (50) on the outer circumferential surface of the body (11) in the axial direction (vertical direction) of the body (11). Furthermore, the fifth rib (95) is positioned on the outer circumferential surface of the body (11) on the third line (L3) connecting the three third welds (83).

[0130] As shown in Figure 7, in Embodiment 3, on the outer circumferential surface of the body portion (11) of the casing (10), the annular region between the upper end of the lower bearing portion (50) and the lower end of the body portion (11) in the vertical direction is defined as the third region (A3). The fifth rib (95) is formed to extend from the upper end to near the lower end of the third region (A3). Therefore, in Embodiment 3, the fifth rib (95) is provided so as to intersect with the third line (L3) connecting the three third welds (83) on the outer circumferential surface of the body portion (11).

[0131] The fifth rib (95) is fixed to the outer circumferential surface of the body (11) of the casing (10) by welding. The fifth rib (95) is formed in a rectangular cross-section. As shown in Figure 8, the fifth rib (95) is formed such that its height (the distance between the proximal end face facing the casing (10) and its opposing distal end face; in Embodiment 3, the radial length of the body (11) of the casing (10)) h5 is greater than its width (the length in the width direction perpendicular to the height direction) b5 (h5 > b5). In Embodiment 3, h5 is formed to be 15 mm and b5 to be 5 mm. In Embodiment 3, the fifth rib (95) is provided so that its height direction coincides with the radial direction of the body (11) of the casing (10), but its height direction may be inclined with respect to the radial direction of the body (11) of the casing (10).

[0132] (4-4) Action by the ribs When the compressed refrigerant in the compression section of the compression mechanism (30) is discharged into the casing (10), the pressure of the discharged refrigerant (high pressure) acts on the body (11) in a direction that causes it to deform outward (expand). The first to third welds (81 to 83) do not deform because the pressure of the discharged refrigerant does not act on them, and the parts of the body (11) other than the first to third welds (81 to 83) attempt to deform.

[0133] However, in Embodiment 3, a first rib (91) is provided on the outer circumferential surface of the shell (11) at a location that is easily deformed by the pressure of the discharged refrigerant, that is, between two circumferentially adjacent first welds (81). Therefore, when the shell (11) attempts to deform, a load is also applied to the first rib (91), generating stress. This stress on the first rib (91) suppresses the deformation of the shell (11), resulting in no deformation at all, or if deformation occurs, the deformation (bulging) is reduced. As a result, the stress acting on the first welds (81) provided on both sides of the first rib (91) is reduced.

[0134] Furthermore, in Embodiment 3, a second rib (92) is provided on the outer circumferential surface of the shell (11) at a location that is easily deformed by the pressure of the discharged refrigerant, that is, between two adjacent second welds (82) in the circumferential direction. Therefore, when the shell (11) attempts to deform, a load is also applied to the second rib (92), generating stress. This stress on the second rib (92) suppresses the deformation of the shell (11), resulting in no deformation at all, or if deformation occurs, the deformation (bulging) is reduced. As a result, the stress acting on the second welds (82) provided on both sides of the second rib (92) is reduced.

[0135] Furthermore, in Embodiment 3, a fifth rib (95) is provided on the outer circumferential surface of the shell (11) at a location that is easily deformed by the pressure of the discharged refrigerant, namely between two circumferentially adjacent third welds (83). Therefore, when the shell (11) attempts to deform, a load is also applied to the fifth rib (95), generating stress. This stress on the fifth rib (95) suppresses the deformation of the shell (11), resulting in no deformation at all or only a small deformation (bulging). As a result, the stress acting on the third welds (83) on both sides of the fifth rib (95) is reduced.

[0136] With the above configuration, Embodiment 3 can achieve the same effects as Embodiment 1.

[0137] Embodiment 4 Embodiment 4 is a modified version of Embodiment 3 in which the compressor (1) configuration is partially changed. Specifically, in the compressor (1) of Embodiment 3, the stator (21) of the motor (20) is fixed to the body (11) of the casing (10) by shrink fitting rather than welding. Therefore, as shown in Figure 9, the compressor (1) of Embodiment 4 does not have a second welded joint (82).

[0138] As the stator (21) is shrink-fitted into the body (11) in this manner, the portion of the body (11) corresponding to the stator (21) is reinforced by the stator (21), making it less susceptible to deformation due to the internal pressure of the casing (10) (pressure of the discharged refrigerant). For this reason, the compressor (1) of Embodiment 4 does not have a second rib (92).

[0139] On the other hand, as shown in Figure 9, in Embodiment 4, the first rib (91) is formed to have a long vertical length such that its lower end reaches near the upper end of the second region (A2). Similarly, the second rib (92) is also formed to have a long vertical length such that its upper end reaches near the lower end of the second region (A2).

[0140] The other components are the same as in Embodiment 3, so a detailed explanation will be omitted. Furthermore, Embodiment 4 can achieve the same effects as Embodiment 3.

[0141] Modification 1 of Embodiment 4 Modification 1 of Embodiment 4 is a modification of the compressor (1) of Embodiment 4. Specifically, in Modification 1 of Embodiment 4, the stator (21) of the motor (20) is fixed to the body (11) of the casing (10) by press-fitting instead of shrink-fitting. The other configurations are the same as in Embodiment 4. And it can achieve the same effects as in Embodiment 4.

[0142] While embodiments and modifications have been described above, it will be understood that a variety of changes in form and details are possible without departing from the spirit and scope of the claims. Furthermore, these embodiments and modifications may be combined or substituted as appropriate, as long as they do not impair the functions of the subject matter of this disclosure. The terms “First,” “Second,” etc., used above are used to distinguish the phrases to which these terms are attached, and do not limit the number or order of such phrases. [Industrial applicability]

[0143] As described above, this disclosure is useful for compressors and refrigeration cycle systems. [Explanation of symbols]

[0144] 1. Compressor 9 Refrigerant Circuit 10 Casing 11. Body (casing body) 12. Upper end plate (end plate) 13. Lower end plate (end plate) 20 motors 21 status 22 rotors 30 Compression mechanism 34 Cylinder (Compression section) 35 Roller (compression section) 36 Housing (bearing) 37 Fixed Scroll (Compression Section) 38. Movable scroll (compression section) 41 Front head (bearing) 42 Rear head (bearing) 70 Drive shaft 81. First Weld 82 Second Weld 91 First rib (first projection) 92 Second rib (second projection) 93 Third rib (third projection) 94. Fourth rib (fourth projection) 100 Refrigeration cycle equipment L1 First line L2 Second line A1 1st area A2 2nd area

Claims

1. A casing (10) having a cylindrical casing body (11) and end plates (12, 13), A drive shaft (70) is provided within the casing (10) and extends in the axial direction of the casing body (11), A motor (20) is provided within the casing (10) and drives the drive shaft (70), The device comprises a compression mechanism (30) provided within the casing (10) and having a compression unit that compresses the refrigerant and discharges it into the casing (10), and a bearing fixed to the compression unit and supporting the drive shaft (70), The above-mentioned compression mechanism (30) is welded and fixed to the casing body (11) by a plurality of first welds (81) arranged in the circumferential direction. A first projection (91) extending in a direction intersecting the circumferential direction of the casing body (11) is fixed to the outer circumferential surface of the casing body (11). The first projection (91) is provided between the plurality of first welds (81) on the outer circumferential surface of the casing body (11). Compressor.

2. In the compressor according to claim 1, The first projection (91) is provided in an annular first region (A1) on the outer circumferential surface of the casing body (11) that corresponds to the compression mechanism (30). Compressor.

3. In the compressor according to claim 2, The first projection (91) is located on the first line (L1) connecting the plurality of first welds (81) on the outer circumferential surface of the casing body (11). Compressor.

4. In the compressor according to claim 1, The motor (20) is welded and fixed to the casing body (11) by a plurality of second welds (82) arranged in the circumferential direction. A second projection (92) extending in a direction intersecting the circumferential direction of the casing body (11) is fixed to the outer circumferential surface of the casing body (11). The second projection (92) is provided between the plurality of second welds (82) on the outer circumferential surface of the casing body (11). Compressor.

5. In the compressor according to claim 4, The motor (20) has a stator (21) and a rotor (22), and the stator (21) is fixed to the casing body (11) by welding at the plurality of second welds (82). The second projection (92) is provided in an annular second region (A2) on the outer circumferential surface of the casing body (11) that corresponds to the stator (21). Compressor.

6. In the compressor according to claim 5, The second projection (92) is located on the second line (L2) connecting the plurality of second welds (82) on the outer circumferential surface of the casing body (11). Compressor.

7. In the compressor according to claim 4, The plurality of second protrusions (92) are provided at positions that are circumferentially offset from the plurality of first protrusions (91). Compressor.

8. In the compressor according to claim 2 or 3, The above motor (20) has a stator (21) and a rotor (22), The stator (21) is fixed to the casing body (11) by shrink fitting or press fitting. Compressor.

9. In the compressor according to claim 8, On the outer circumferential surface of the casing body (11), a third projection (93) is fixed on the side opposite to the compression mechanism (30), straddling the annular second region (A2) corresponding to the stator (21), in a direction intersecting the circumferential direction of the casing body (11). Compressor.

10. In the compressor according to claim 8, A fourth projection (94) extending in a direction intersecting the circumferential direction of the casing body (11) is fixed between the annular second region (A2) corresponding to the stator (21) and the first region (A1) on the outer circumferential surface of the casing body (11). Compressor.

11. In the compressor according to any one of claims 1 to 3, The height of the first projection (91) is longer than its width. Compressor.

12. In the compressor according to any one of claims 4 to 7, The height of the second projection (92) described above is longer than its width. Compressor.

13. A refrigeration cycle apparatus comprising a compressor (1) according to any one of claims 1 to 7.

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