阅读说明：本技术 涡旋式压缩机 (Scroll compressor having a discharge port ) 是由 高桥伸郎 于 2019-01-07 设计创作，主要内容包括：在涡旋式压缩机的旋转涡旋盘(50)设有旋转侧端板部(51)和旋转侧涡卷(60)。在旋转侧端板部(51)形成有背面凹部(70)。背面凹部(70)在旋转侧端板部(51)的背面(53)和外周面(54)上都开口。背面凹部(70)沿着旋转侧涡卷(60)的卷绕结束部(63)延伸。通过形成背面凹部(70),而能够抑制旋转侧涡卷(60)在涡旋式压缩机反转时受到损伤。(A orbiting scroll (50) of a scroll compressor is provided with a orbiting-side end plate (51) and an orbiting-side lap (60). A back surface recess (70) is formed in the rotation-side end plate (51). The back surface recess (70) is open on both the back surface (53) and the outer peripheral surface (54) of the rotation-side end plate (51). The back recess (70) extends along the winding end (63) of the orbiting wrap (60). By forming the back surface recess (70), the orbiting wrap (60) can be prevented from being damaged when the scroll compressor is reversely rotated.)

1. A scroll compressor including a orbiting scroll (50) and a fixed scroll (40), the orbiting scroll (50) having a disc-shaped orbiting end plate portion (51) and a orbiting side wrap (60) projecting from a front surface (52) of the orbiting end plate portion (51) in a spiral wall shape, the fixed scroll (40) having a fixed side wrap (42) in a spiral wall shape meshing with the orbiting side wrap (60), the scroll compressor characterized in that:

a back surface recess (70) is formed in the rotation-side end plate (51), and the back surface recess (70) opens onto the back surface (53) of the rotation-side end plate (51) and extends along the winding end portion (63) of the orbiting-side wrap (60).

2. The scroll compressor of claim 1, wherein:

a direction along the orbiting-side wrap (60) from a winding start end (61) toward a winding end (62) of the orbiting-side wrap (60) is an extension direction of the orbiting-side wrap (60),

the entire rear recess (70) is formed on the rear side of the winding end (62) of the orbiting-side wrap (60) in the extending direction of the orbiting-side wrap (60).

3. The scroll compressor of claim 1, wherein:

a direction along the orbiting-side wrap (60) from a winding start end (61) toward a winding end (62) of the orbiting-side wrap (60) is an extension direction of the orbiting-side wrap (60),

the rear recess (70) is formed from the front side of the winding end (62) of the orbiting side wrap (60) to the rear side of the winding end (62) in the extending direction of the orbiting side wrap (60).

4. The scroll compressor of claim 3, wherein:

the length of a portion (77) of the back recess (70) located on the rear side of the winding end (62) of the orbiting side wrap (60) in the circumferential direction of the orbiting side end plate (51) in the longitudinal direction of the orbiting side wrap (60) is equal to or greater than the length of a portion (76) of the back recess (70) located on the front side of the winding end (62) of the orbiting side wrap (60) in the circumferential direction of the orbiting side end plate (51).

5. The scroll compressor of any one of claims 1 to 4, wherein:

the back surface recess (70) is open on both the back surface (53) and the outer peripheral surface (54) of the rotation-side end plate (51).

6. The scroll compressor of claim 5, wherein:

the width of the back surface recess (70) in the radial direction of the rotation-side end plate (51) is W,

on the other hand, on a straight line passing through an outermost peripheral edge (66) of an outer side surface (65) of the orbiting-side wrap (60) and a center C of the orbiting-side end plate (51), when a distance from the center C of the orbiting-side end plate (51) to an outer peripheral surface (54) of the orbiting-side end plate (51) is represented by R, a distance from the center C of the orbiting-side end plate (51) to the outer side surface (65) of the orbiting-side wrap (60) is represented by Re, and a thickness of the orbiting-side wrap (60) is represented by te,

satisfy the relation that R- (Re + te) is more than or equal to W and less than or equal to R- (Re-2 te).

7. The scroll compressor of any one of claims 1 to 6, wherein:

an inner peripheral side wall surface (71) of the rear recess (70) is located outside an outer surface (65) of the orbiting-side wrap (60) in the radial direction of the orbiting-side end plate (51).

8. The scroll compressor of any one of claims 1 to 7, wherein:

the back surface recess (70) is formed from the inside of the outer surface (65) of the winding end portion (63) of the orbiting-side wrap (60) to the outside of the outer surface (65) in the radial direction of the orbiting-side end plate portion (51).

9. The scroll compressor of any one of claims 1 to 8, wherein:

when the depth of the back surface recess (70) is D and the thickness of the rotation-side end plate (51) is T, a relationship of D/T of 0.5 to 0.8 is satisfied.

Technical Field

The present disclosure relates to a scroll compressor.

Background

Scroll compressors having a orbiting scroll and a fixed scroll have been known so far. When the scroll compressor is stopped, the orbiting scroll may be rotated in a direction opposite to a rotation direction when the scroll compressor is operated. When the orbiting scroll is reversed, a load applied to a winding end portion of the orbiting wrap becomes excessive, and the orbiting wrap may be damaged. Therefore, in the scroll compressor disclosed in patent document 1, the load acting on the winding end portion of the orbiting-side wrap during the reverse rotation of the orbiting scroll is reduced by forming the notch portion having a predetermined shape in the winding end portion of the orbiting-side wrap.

Disclosure of Invention

Technical problems to be solved by the invention

In the case where the cut-out portion is formed at the winding end portion of the orbiting-side wrap as in the scroll compressor disclosed in patent document 1, the portion of the orbiting-side wrap where the cut-out portion is formed cannot form the compression chamber. As a result, the length of the portion of the orbiting wrap where the compression chamber can be formed is shortened, and the volume of the compression chamber at the time of sealing is reduced, which may make it impossible to secure the capacity of the scroll compressor.

The purpose of the present disclosure is: the capacity of the scroll compressor is ensured, and damage to the orbiting side wrap is suppressed.

Technical solution for solving technical problem

A first aspect of the present disclosure is directed to a scroll compressor including an orbiting scroll 50 and a fixed scroll 40, the orbiting scroll 50 having a disc-shaped orbiting end plate 51 and a orbiting side wrap 60 projecting from a front surface 52 of the orbiting end plate 51 and having a spiral wall shape, the fixed scroll 40 having a spiral wall-shaped fixed side wrap 42 meshing with the orbiting side wrap 60. A back recess 70 is formed in the rotation-side end plate 51, and the back recess 70 opens in the back surface 53 of the rotation-side end plate 51 and extends along the winding end 63 of the orbiting wrap 60.

In the first aspect, the rotation-side end plate portion 51 is formed with a back surface recess 70. The rotation-side end plate 51 has a lower rigidity than other portions because the thickness of the portion where the rear recess 70 is formed is smaller than the thickness of other portions. The back recess 70 extends along the winding end 63 of the orbiting-side wrap 60. Therefore, the rigidity of the portion of the rotating-side end plate 51 extending along the winding end 63 of the orbiting-side wrap 60 becomes low.

In the process of reversing the orbiting scroll 50, a large load may act on the winding end portion 63 of the orbiting wrap 60. In this case, in the scroll compressor 10 of the first aspect, the portion of the rotation-side end plate portion 51 where the back surface recessed portion 70 is formed (i.e., the portion with low rigidity) is elastically deformed. Therefore, the stress generated in the vicinity of the root of the winding end portion 63 of the orbiting-side wrap 60 (i.e., on the base end portion of the rotational-side end plate portion 51) is reduced, and damage to the orbiting-side wrap 60 can be avoided.

A second aspect of the present disclosure is the first aspect, wherein a direction along the orbiting side wrap 60 from the winding start end 61 of the orbiting side wrap 60 toward the winding end 62 is an extension direction of the orbiting side wrap 60, and the entire back recess 70 is formed at a rear side of the winding end 62 of the orbiting side wrap 60 in the extension direction of the orbiting side wrap 60.

With the rotating-side end plate portion 51 of the second aspect, the entire back recess 70 is formed on the rear side of the winding end 62 of the orbiting wrap 60 in the extending direction of the orbiting wrap 60. In this aspect, the entire back recess 70 extends along the orbiting side wrap 60.

In the third aspect of the present disclosure, in addition to the first aspect, a direction along the orbiting scroll 60 from the winding start end 61 of the orbiting scroll 60 to the winding end 62 is an extension direction of the orbiting scroll 60, and the back recess 70 is formed from a front side of the winding end 62 of the orbiting scroll 60 to a rear side of the winding end 62 in the extension direction of the orbiting scroll 60.

In the extending direction of the orbiting scroll 60, a portion of the back recess 70 of the third aspect is located in front of the winding end 62 of the orbiting scroll 60, and the remaining portion is located in the rear region of the winding end 62 of the orbiting scroll 60.

In the fourth aspect of the present disclosure, in addition to the third aspect, in the extending direction of the orbiting scroll 60, the length of the portion 77 of the back recess 70 located on the rear side of the winding end 62 of the orbiting scroll 60 in the circumferential direction of the orbiting end plate 51 is equal to or greater than the length of the portion 76 of the back recess 70 located on the front side of the winding end 62 of the orbiting scroll 60 in the circumferential direction of the orbiting end plate 51.

The portion 77 of the back recess 70 of the fourth aspect located behind the winding end 62 of the orbiting scroll 60 extends along the winding end 63 of the orbiting scroll 60 in the extending direction of the orbiting scroll 60, and the portion 76 of the back recess 70 located in front of the winding end 62 of the orbiting scroll 60 does not overlap the winding end 63 of the orbiting scroll 60 in the extending direction of the orbiting scroll 60. Therefore, the length of the portion 77 of the back recess 70 extending along the winding end 63 of the orbiting wrap 60 is equal to or greater than the length of the portion 76 of the back recess 70 not overlapping the winding end 63 of the orbiting wrap 60.

A fifth aspect of the present disclosure is based on any one of the first to fourth aspects described above, wherein the back surface recess 70 is open on both the back surface 53 and the outer peripheral surface 54 of the rotation-side end plate portion 51.

In the rotation-side end plate portion 51 of the fifth aspect, the back surface recess 70 is open on both the back surface 53 and the outer peripheral surface 54 of the rotation-side end plate portion 51. The outer peripheral surface 54 of the rotation-side end plate 51 is located outside the orbiting wrap 60 in the radial direction of the rotation-side end plate 51. Therefore, at least a part of the back recess 70 in this aspect is located outside the winding end portion 63 of the orbiting-side wrap 60 in the radial direction of the orbiting-side end plate portion 51. Since the back recess 70 is open on the outer peripheral surface 54 of the rotating-side end plate portion 51 in this aspect, the rigidity of the portion extending along the winding end portion 63 of the orbiting-side wrap 60 is reduced.

In the sixth aspect of the present disclosure, in addition to the fifth aspect, assuming that W is a width of the back surface recess 70 in the radial direction of the rotation-side end plate 51, and on a straight line passing through the outermost peripheral end 66 of the outer side surface 65 of the orbiting scroll 60 and the center C of the rotation-side end plate 51, a relationship of R- (Re + te) ≦ W ≦ R- (Re-2 te) is satisfied when R is a distance from the center C of the rotation-side end plate 51 to the outer peripheral surface 54 of the rotation-side end plate 51, Re is a distance from the center C of the rotation-side end plate 51 to the outer side surface 65 of the orbiting scroll 60, and te is a thickness of the orbiting scroll 60.

In the sixth aspect, the width W of the back surface recessed portion 70 satisfies the relationship of R- (Re + te) ≦ W ≦ R- (Re-2 te). In this aspect, the size of the portion of the rotation-side end plate portion 51 where the back surface recessed portion 70 is formed (i.e., the portion with low rigidity) can be secured. As a result, stress generated in the vicinity of the root of the winding end 63 of the orbiting wrap 60 is reduced, and damage to the orbiting wrap 60 is avoided.

A seventh aspect of the present disclosure is the first to sixth aspects, wherein an inner peripheral side wall surface 71 of the rear recess 70 is located outside the outer side surface 65 of the orbiting scroll 60 in a radial direction of the orbiting side end plate portion 51.

With the rotation-side end plate 51 of the seventh aspect, the back recess 70 is disposed on the outer side of the outer side surface 65 of the orbiting-side scroll 60 in the radial direction of the rotation-side end plate 51.

An eighth aspect of the present disclosure is the first to sixth aspects, wherein the back recess 70 is formed from an inner side of an outer surface 65 of the winding end portion 63 of the orbiting scroll 60 to an outer side of the outer surface 65 in a radial direction of the rotating end plate portion 51.

In the rotation-side end plate 51 of the eighth aspect, the back recess 70 is formed from the outer portion of the orbiting wrap 60 to a portion inside the outer peripheral surface 54 of the winding end portion 63 of the orbiting wrap 60 in the radial direction of the rotation-side end plate 51.

A ninth aspect of the present disclosure is the first to eighth aspects, wherein a relationship of 0.5 ≦ D/T ≦ 0.8 is satisfied when the depth of the back surface recessed portion 70 is D and the thickness of the rotation-side end plate portion 51 is T.

In the rotational-side end plate portion 51 according to the ninth aspect, the back surface recessed portion 70 satisfies the relationship of D/T0.5. ltoreq.0.8. Therefore, the rigidity of the portion of the rotating-side end plate 51 where the back recess 70 is formed is low, and the stress generated in the portion near the root of the winding end portion 63 of the orbiting-side wrap 60 is reduced.

Drawings

Fig. 1 is a longitudinal sectional view of a scroll compressor of an embodiment;

FIG. 2 is a cross-sectional view of the compression mechanism in section taken along section II-II of FIG. 1;

FIG. 3 is a perspective view of the orbiting scroll of the embodiment viewed from the orbiting side wrap side;

fig. 4 is a perspective view of the rotary scroll of the embodiment viewed from the flange portion side;

FIG. 5 is a top view of an embodiment of a rotary scroll;

FIG. 6 is a rear view of an embodiment of a rotary scroll;

fig. 7 is a sectional view of the rotary scroll, which shows a main portion in a section taken along VII-VII of fig. 5;

fig. 8 is a plan view of a rotary scroll according to a first modification;

fig. 9 is a sectional view of the orbiting scroll, which shows a main part in a section taken along IX-IX of fig. 8;

fig. 10 is a plan view of a orbiting scroll according to a first modification;

FIG. 11 is a sectional view of the orbiting scroll, which shows a main part in a section taken along XI-XI of FIG. 10;

fig. 12 is a plan view of a orbiting scroll according to a first modification;

fig. 13 is a plan view of a orbiting scroll according to a second modification;

fig. 14 is a plan view of a orbiting scroll according to a second modification;

fig. 15 is a plan view of a rotary scroll according to a third modification;

fig. 16 is a cross-sectional view showing a section corresponding to fig. 7 of a orbiting scroll of a fourth modification.

Detailed Description

The scroll compressor 10 of the embodiment will be explained. The scroll compressor 10 is connected to a refrigerant circuit (not shown) in which a refrigerant circulates to perform a refrigeration cycle, and the scroll compressor 10 compresses the refrigerant as a fluid.

Integral construction of scroll compressor

As shown in fig. 1, the scroll compressor 10 is a totally enclosed compressor in which a compression mechanism 30 and a motor 20 are housed in a casing 11 as a closed container.

The casing 11 is a cylindrical pressure vessel sealed at both ends. The housing 11 is provided with its axial direction in the vertical direction. A suction pipe 12 for introducing the refrigerant in the refrigerant circuit into the compression mechanism 30 is provided at an upper end portion of the casing 11. The casing 11 is provided with a discharge pipe 13 for drawing the refrigerant in the casing 11 to the outside of the casing 11. Lubricating oil for lubricating the compression mechanism 30 and the like is stored in the bottom of the casing 11.

Inside the casing 11, the motor 20 is disposed below the compression mechanism 30. The motor 20 and the compression mechanism 30 are coupled by a drive shaft 25. The motor 20 includes a stator 21 and a rotor 22. The stator 21 of the motor 20 is fixed to the housing 11. The rotor 22 of the motor 20 is mounted on a drive shaft 25.

The drive shaft 25 includes a main shaft portion 26 and an eccentric shaft portion 27. The axial center of the main shaft 26 coincides with the axial center of the drive shaft 25. The rotor 22 of the motor 20 is attached to the main shaft 26. A portion of the main shaft 26 located above the rotor 22 is supported by a bearing 36 of the compression mechanism 30 described later, and a portion of the main shaft 26 located below the rotor 22 is supported by a lower bearing member 15 described later. The eccentric shaft portion 27 is formed in a short shaft shape and is provided protruding from the upper end of the main shaft portion 26. The axis of the eccentric shaft portion 27 is substantially parallel to the axis of the main shaft portion 26, and is eccentric with respect to the axis of the main shaft portion 26.

A lower bearing member 15 is provided at a lower portion in the housing 11. The lower bearing member 15 is fixed to the housing 11. The lower bearing member 15 constitutes a journal bearing that rotatably supports the main shaft portion 26 of the drive shaft 25.

Construction of the compression mechanism

The compression mechanism 30 includes a fixed member (housing)35, a fixed scroll 40, a orbiting scroll 50, and an oldham coupling 32. The fixing member 35 is fixed to the cabinet 11. The fixed scroll 40 is disposed on an upper surface of the fixed member 35. The orbiting scroll 50 is disposed between the fixed scroll 40 and the fixed member 35.

The fixing member 35 is a centrally recessed disk-shaped member. A bearing portion 36 is formed on the fixed member 35. The bearing portion 36 is a thick-walled cylindrical portion projecting downward. The bearing portion 36 constitutes a journal bearing that rotatably supports the main shaft portion 26 of the drive shaft 25.

As also shown in fig. 2, the fixed scroll 40 includes a fixed-side end plate 41, a fixed-side wrap 42, and an outer peripheral wall portion 43. The fixed wrap 42 is formed in a spiral wall shape in which an involute curve is drawn, and protrudes from a front surface (a lower surface in fig. 1) of the fixed end plate portion 41. Outer circumferential wall 43 surrounds the outer circumferential side of fixed wrap 42 and projects from the front surface of fixed end plate 41. The tip end surface of the fixed wrap 42 is substantially flush with the tip end surface of the outer circumferential wall portion 43.

The compression mechanism 30 of the present embodiment has an asymmetric scroll structure in which the fixed wrap 42 is longer than the orbiting wrap 60 of the orbiting scroll 50 described later. As shown by the two-dot chain line in fig. 2, the outermost portion of the fixed wrap 42 is integrated with the outer peripheral wall portion 43.

As also shown in fig. 3 and 4, the orbiting scroll 50 includes a rotational end plate 51, an orbiting scroll wrap 60, and a flange portion 55. The rotating-side end plate 51 is formed in a substantially circular flat plate shape. The orbiting-side wrap 60 is formed in a spiral wall shape drawing an involute curve, and protrudes from the front surface 52 (upper surface in fig. 1) of the orbiting-side end plate portion 51. The tip of the orbiting-side wrap 60 near the center of the orbiting-side end plate 51 is a winding start end 61, and the tip of the outer peripheral surface 54 of the orbiting-side wrap 60 near the orbiting-side end plate 51 is a winding end 62. The flange portion 55 is formed in a cylindrical shape and is disposed in a central portion of the back surface 53 of the rotation-side end plate portion 51. The eccentric shaft portion 27 of the drive shaft 25 is inserted into the flange portion 55.

The rotary-side end plate 51 of the orbiting scroll 50 is formed with a key groove 56 and a back recess 70. The key groove 56 is a groove opened on the back surface 53 of the rotation-side end plate. As shown in fig. 5 and 6, the key grooves 56 are arranged one each at positions opposed to each other across the center of the rotation-side end plate portion 51. The key of the oldham coupling 32 is fitted into the key groove 56. The rear surface recess 70 will be described later.

The oldham coupling 32 is disposed between the rotary scroll 50 and the fixed member 35. The oldham coupling 32 engages with the orbiting scroll 50 and the fixed member 35, respectively, to restrict the orbiting scroll 50 from rotating.

As also shown in fig. 2, the orbiting-side wrap 60 of the orbiting scroll 50 meshes with the stationary-side wrap 42 of the stationary scroll 40. An inner surface 64 of the orbiting scroll 60 slides on the outer surface 48 of the fixed scroll 42, and an outer surface 65 of the orbiting scroll 60 slides on the inner surface 47 of the fixed scroll 42. The inner surface 64 of the orbiting scroll 60 slides against the outer surface 48 of the fixed scroll 42 in the sidewall surface of the orbiting scroll 60. The outer surface 65 of the orbiting wrap 60 slides against the inner surface 47 of the fixed wrap 42 in the sidewall surface of the orbiting wrap 60. In the compression mechanism 30, a compression chamber 31 surrounded by the stationary end plate 41 and the stationary wrap 42 of the stationary scroll 40 and the rotating end plate 51 and the orbiting wrap 60 of the orbiting scroll 50 is formed.

An air inlet 44 is formed in an outer peripheral wall portion 43 of the fixed scroll 40. The suction port 44 is connected to the downstream end of the suction pipe 12. An exhaust port 45 penetrating the fixed-side end plate portion 41 is formed in the center of the fixed-side end plate portion 41 of the fixed scroll 40.

A high-pressure chamber 46 is formed in the center of the back surface (upper surface in fig. 1) of the stationary-side end plate portion 41. The high-pressure chamber 46 is a space communicating with the exhaust port 45. The high-pressure chamber 46 communicates with a space below the fixing member 35 in the casing 11 through a passage not shown.

Operation of the scroll compressor

In the scroll compressor 10, the orbiting scroll 50 of the compression mechanism 30 is driven by the motor 20 to perform an orbital motion. The rotary scroll 50 of the present embodiment revolves clockwise in fig. 2. When the orbiting scroll 50 moves, the refrigerant flowing from the suction pipe 12 into the suction port 44 flows into the compression chamber 31. As the orbiting scroll 50 moves, the compression chamber 31 moves from the winding end 62 to the winding start 61 of the orbiting wrap 60, and the volume of the compression chamber 31 is reduced and the refrigerant in the compression chamber 31 is compressed. The compressed refrigerant is discharged from the compression chamber 31 toward the high-pressure chamber 46 through the discharge port 45. The refrigerant flowing into the high pressure chamber 46 flows into a space below the fixing member 35 inside the casing 11, and then flows out toward the outside of the casing 11 through the discharge pipe 13.

A back recess of the rotation-side end plate

As described above, the rear surface recess 70 is formed in the rotation-side end plate 51 of the orbiting scroll 50. Here, the rear surface recess 70 will be described in detail with reference to fig. 3 to 7.

The rear surface recess 70 is a recess that is open on both the rear surface 53 and the outer peripheral surface 54 of the rotation-side end plate portion 51. The back surface recess 70 is curved along the outer peripheral edge of the rotation-side end plate portion 51. That is, the back recess 70 extends along the winding end 63 of the orbiting wrap 60 (see fig. 5 and 6). The winding end 63 of the orbiting wrap 60 will be described later.

An inner peripheral side wall surface 71 of the rear recess 70 is a portion extending along the winding end portion 63 of the orbiting wrap 60, facing a side wall surface of the rear recess 70. The inner peripheral wall surface 71 is located slightly outside the outer surface 65 of the winding end portion 63 of the orbiting-side wrap 60 in the radial direction of the orbiting-side end plate 51 (see fig. 5 to 7). That is, the entire back recess 70 is located outside the winding end portion 63 of the orbiting-side wrap 60 in the radial direction of the rotating-side end plate portion 51.

The back recess 70 is formed from the front side of the winding end 62 of the orbiting wrap 60 to the rear side of the winding end 62 in the circumferential direction of the rotating-side end plate 51. That is, in the rotation-side end plate 51 of the present embodiment, when the angle formed around the center C of the rotation-side end plate 51 is defined as the central angle, the back recess 70 is formed in the region including the winding end 62 of the orbiting wrap 60 while maintaining the central angle within a predetermined numerical range. The center C of the rotation-side end plate 51 is a point on the central axis of the flange 55. In other words, the rear recess 70 is formed from the front side of the winding end 62 of the orbiting-side wrap 60 to the rear side of the winding end 62 in the extending direction of the orbiting-side wrap 60. The extending direction of the orbiting-side wrap 60 is a direction along the orbiting-side wrap 60 from the winding start end 61 of the orbiting-side wrap 60 toward the winding end 62.

The front side wall surface 73 of the back surface recess 70 is a plane surface including a part of the radiation HF shown in fig. 6. The radiation HF is a radiation extending from the center C of the rotation-side end plate 51 to the radially outer side of the rotation-side end plate 51. The front wall surface 73 of the rear recess 70 is located further forward (forward in the clockwise direction in fig. 5, and forward in the counterclockwise direction in fig. 6) than the winding end 62 of the orbiting wrap 60 in the circumferential direction of the orbiting end plate 51. That is, the front wall surface 73 of the rear recess 70 is disposed at a position advanced more to the front side than the winding end 62 of the orbiting wrap 60 in the winding direction of the orbiting wrap 60. The winding direction of the orbiting-side wrap 60 is the same as the extending direction of the orbiting-side wrap 60.

The rear wall surface 74 of the rear recess 70 is a plane including a part of the ray HB shown in fig. 6. The radiation beam HB extends radially outward from the center C of the rotation-side end plate 51. The rear wall surface 74 of the rear recess 70 is located further rearward (on the side of counterclockwise in fig. 5, on the side of clockwise in fig. 6) than the winding end 62 of the orbiting wrap 60 in the circumferential direction of the orbiting end plate 51. That is, the rear wall surface 74 of the rear recess 70 is disposed closer to the winding start end 61 than the winding end 62 of the orbiting wrap 60 in the winding direction of the orbiting wrap 60. The winding direction of the orbiting-side wrap 60 is the same as the extending direction of the orbiting-side wrap 60.

In the rotating-side end plate 51 of the present embodiment, the angle α formed by the radiation H1 and the radiation HB is equal to or greater than the angle β formed by the radiation H1 and the radiation HF (α ≧ β). In the present embodiment, the angle α is 35 ° and the angle β is 15 °. The angle alpha is preferably more than twice the angle beta (alpha.gtoreq.2beta). The ray H1 is a ray that extends from the center C of the rotation-side end plate 51 to the radially outer side of the rotation-side end plate 51 and passes through the winding end 62 of the orbiting wrap 60.

In the circumferential direction of the rotation-side end plate portion 51, a portion of the rear recess 70 located on the front side of the winding end 62 of the orbiting scroll 60 is defined as a front portion 76, and a portion of the rear recess 70 located on the rear side of the winding end 62 of the orbiting scroll 60 is defined as a rear portion 77. The front portion 76 is a portion of the rear recess 70 located on the front side of the winding end 62 of the orbiting wrap 60 in the extending direction of the orbiting wrap 60. The rear portion 77 is a portion of the rear recess 70 located more rearward than the winding end 62 of the orbiting wrap 60 in the extending direction of the orbiting wrap 60.

The length LF of the front portion 76 of the rear recess 70 in the circumferential direction of the rotation-side end plate 51 is proportional to the angle β, and the length LB of the rear portion 77 of the rear recess 70 in the circumferential direction of the rotation-side end plate 51 is proportional to the angle α. As described above, the angle α of the rear surface concave portion 70 of the present embodiment is equal to or larger than the angle β. Therefore, the length LB of the rear portion 77 of the rear concave portion 70 in the circumferential direction of the rotational-side end plate 51 is equal to or greater than the length LF of the front portion 76 of the rear concave portion 70 in the circumferential direction of the rotational-side end plate 51 (LB ≧ LF).

The width W of the back surface recessed portion 70 in the radial direction of the rotation-side end plate portion 51 is substantially constant over the entire length of the rotation-side end plate portion 51 in the circumferential direction. In the present embodiment, the width W of the rear surface recessed portion 70 is the distance from the inner peripheral side surface of the rear surface recessed portion 70 to the outer peripheral surface 54 of the rotation-side end plate portion 51. Here, the distance from the outer surface 65 of the orbiting-side wrap 60 to the outer peripheral surface 54 of the orbiting-side end plate 51 is denoted by L (see fig. 7). In the present embodiment, the width W of the rear surface concave portion 70 is longer than half the minimum value Lmin of the distance L (W > Lmin/2).

In the present embodiment, the depth D of the back surface recess 70 is about 62% of the thickness T of the rotation-side end plate portion 51. The depth D of the rear surface recessed portion 70 of the present embodiment is substantially constant throughout the rear surface recessed portion 70. Therefore, the bottom wall surface 75 of the back surface recess 70 is a plane substantially parallel to the front surface 52 of the rotation-side end plate portion 51. The depth D of the back surface recess 70 is preferably at least half the thickness T of the rotation-side end plate 51 (D.gtoreq.T/2). The depth D of the rear surface recess 70 is more preferably 0.5T to 0.8T. That is, in the present embodiment, the depth D of the back surface recessed portion 70 and the thickness T of the rotation-side end plate portion 51 preferably satisfy the relationship of 0.5. ltoreq. D/T. ltoreq.0.8.

Here, the winding end 63 of the orbiting-side wrap 60 is a portion near the winding end 62 of the orbiting-side wrap 60. In the present embodiment, the winding end 63 of the orbiting-side wrap 60 refers to a portion of the orbiting-side wrap 60 between the rays H1 and H2 in fig. 5. The ray H2 extends radially outward from the center C of the rotation-side end plate 51 and makes an angle of 20 ° with the straight line L1. As described above, the winding end 63 of the orbiting-side wrap 60 of the present embodiment is a portion of the orbiting-side wrap 60 located within a range in which an angle (central angle) formed from the winding end 62 of the orbiting-side wrap 60 around the center C of the orbiting-side end plate is 20 °. It should be noted that the value of the center angle (20 °) shown here is only an example.

Load acting on the orbiting side wrap

When the scroll compressor 10 is operated, the refrigerant pressure in the compression chamber 31 acts on the inner surface 64 and the outer surface 65 of the orbiting scroll 60 in the orbiting scroll 60 of the orbiting scroll 50. Further, the larger the difference between the force acting on the inner surface 64 and the force acting on the outer surface 65 of the orbiting scroll 60, the larger the load acting on the orbiting scroll 60.

As shown in fig. 2, the winding end 63 of the orbiting-side wrap 60 is located near the suction port 44 of the compression mechanism 30. Therefore, when the scroll compressor 10 is operated, the pressure of the refrigerant acting on the inner surface 64 and the outer surface 65 of the winding end portion 63 of the orbiting scroll 60 is substantially equal to the pressure of the refrigerant sucked from the suction port 44 into the compression chamber 31. Therefore, no particularly large load acts on the winding end 63 of the orbiting wrap 60 during operation of the scroll compressor 10.

However, immediately after the scroll compressor 10 stops (that is, immediately after the energization of the motor 20 is cut off), the refrigerant flows backward from the discharge port 45 toward the compression chamber 31, and the refrigerant expands in the compression chamber 31, so that the orbiting scroll 50 may rotate in the reverse direction (counterclockwise direction in fig. 2 in the present embodiment). In the process of the reverse rotation of the orbiting scroll 50, the refrigerant pressure in the compression chamber 31 may not be reduced to the refrigerant pressure in the suction port 44 even at the time when the compression chamber 31 reaches the winding end portion 63 of the orbiting wrap 60. In this case, the pressure difference between the fluid pressures acting on the inner surface 64 and the outer surface 65 of the winding end portion 63 of the orbiting wrap 60 becomes larger than that when the scroll compressor 10 is operated.

Thus, the load acting on the winding end portion 63 of the orbiting wrap 60 may be increased in the process of the reverse rotation of the orbiting scroll 50 as compared with the process of the normal rotation of the orbiting scroll 50. When the thickness of the portion of the rotation-side end plate 51 located near the winding end 63 of the orbiting scroll 60 is substantially the same as the thickness of the other portions, when a large load is applied to the winding end 63 of the orbiting scroll 60, the rotation-side end plate 51 is hardly elastically deformed, and therefore stress is concentrated near the root of the winding end 63 of the orbiting scroll 60 (near the base end of the rotation-side end plate 51), and the orbiting scroll 60 may be damaged.

On the other hand, in the scroll compressor 10 of the present embodiment, the back surface recess 70 is formed in the rotation-side end plate portion 51 of the orbiting scroll 50. As described above, the back recess 70 extends along the winding end 63 of the orbiting-side wrap 60. Therefore, the rotating-side end plate 51 has a thin portion with low rigidity formed in the vicinity of the winding end 63 of the orbiting-side wrap 60. Therefore, the rigidity of the portion of the rotating-side end plate 51 of the present embodiment extending along the winding end portion 63 of the orbiting-side wrap 60 is low.

When a large load acts on the winding end portion 63 of the orbiting wrap 60 during the reverse rotation of the orbiting scroll 50, not only the winding end portion 63 of the orbiting wrap 60 but also a portion of the orbiting-side end plate 51 near the winding end portion 63 of the orbiting wrap 60 is elastically deformed. Therefore, in the process of reversing the orbiting scroll 50, the stress acting on the winding end 63 of the orbiting scroll 60 is dispersed, and the stress generated in the vicinity of the root of the winding end 63 of the orbiting scroll 60 is reduced. In the present embodiment, during the reverse rotation of the orbiting scroll 50, the stress generated in the vicinity of the root of the winding end portion 63 of the orbiting-side wrap 60 is reduced to about 84% of the stress generated when the back surface recess 70 is not formed in the orbiting-side end plate portion 51.

Features (1) of the embodiment

The scroll compressor of the present embodiment includes a orbiting scroll 50 and a fixed scroll 40. The orbiting scroll 50 has a disc-shaped orbiting end plate 51 and a orbiting scroll wrap 60 projecting from a front surface 52 of the orbiting end plate 51 and having a spiral wall shape, and the fixed scroll 40 has a fixed scroll wrap 42 meshing with the orbiting scroll wrap 60 and having a spiral wall shape. In the scroll compressor 10, the rotation-side end plate 51 is formed with a back surface recess 70, and the back surface recess 70 opens at the back surface 53 of the rotation-side end plate 51 and extends along the winding end 63 of the orbiting wrap 60.

The rotation-side end plate 51 of the present embodiment has a lower rigidity than other portions because the thickness of the portion where the rear recess 70 is formed is smaller than the thickness of other portions. The back recess 70 extends along the winding end 63 of the orbiting-side wrap 60. Therefore, the rigidity of the portion of the rotating-side end plate 51 extending along the winding end 63 of the orbiting-side wrap 60 becomes low.

In the process of reversing the orbiting scroll 50, a large stress may be generated in the winding end portion 63 of the orbiting wrap 60. In this case, in the scroll compressor 10 of the present embodiment, the portion of the rotation-side end plate portion 51 where the back surface recessed portion 70 is formed (i.e., the portion with low rigidity) is elastically deformed. Therefore, stress generated in a portion near the root of the winding end portion 63 of the orbiting-side wrap 60 (i.e., near the base end portion of the rotating-side end plate portion 51) is reduced, and damage to the orbiting-side wrap 60 is avoided.

Features (2) of the embodiment

In the scroll compressor 10 of the present embodiment, the back surface recess 70 is formed from the front side of the winding end 62 of the orbiting scroll 60 to the rear side of the winding end 62 in the extending direction of the orbiting scroll 60. The extending direction of the orbiting-side wrap 60 is a direction along the orbiting-side wrap 60 from a winding start end 61 of the orbiting-side wrap 60 toward a winding end 62.

In the extending direction of the orbiting wrap 60, a part of the rear recess 70 of the present embodiment is located in front of the winding end 62 of the orbiting wrap 60, and the remaining part is located in the rear region of the winding end 62 of the orbiting wrap 60.

In the scroll compressor 10 of the present embodiment, the back surface recess 70 is formed from the front side of the winding end 62 of the orbiting scroll 60 to the rear side of the winding end 62 in the circumferential direction of the orbiting side end plate portion 51.

In the circumferential direction of the rotational-side end plate portion 51, a part of the rear recess 70 of the present embodiment is located in front of the winding end 62 of the orbiting-side wrap 60, and the remaining part is located in the rear region of the winding end 62 of the orbiting-side wrap 60.

Features (3) of the embodiment

In the scroll compressor 10 of the present embodiment, the length of the "rear portion 77 located rearward of the winding end 62 of the orbiting scroll 60" of the rear recess 70 in the circumferential direction of the orbiting side end plate 51 is equal to or greater than the length of the "front portion 76 located forward of the winding end 62 of the orbiting scroll 60" of the rear recess 70 in the circumferential direction of the orbiting side end plate 51 in the extending direction of the orbiting scroll 60.

In the extending direction of the orbiting wrap 60, a portion 77 of the back recess 70 located behind the winding end 62 of the orbiting wrap 60 of the present embodiment extends along the winding end 63 of the orbiting wrap 60, while a portion 76 of the back recess 70 located in front of the winding end 62 of the orbiting wrap 60 does not overlap the winding end 63 of the orbiting wrap 60. Therefore, the length of the portion 77 of the back recess 70 extending along the winding end 63 of the orbiting wrap 60 is equal to or greater than the length of the portion 76 of the back recess 70 not overlapping the winding end 63 of the orbiting wrap 60.

In the scroll compressor 10 of the present embodiment, the length of the "rear portion 77 located on the rear side of the winding end 62 of the orbiting scroll 60" of the back surface recess 70 in the circumferential direction of the orbiting side end plate 51 is equal to or greater than the length of the "front portion 76 located on the front side of the winding end 62 of the orbiting scroll 60" of the back surface recess 70 in the circumferential direction of the orbiting side end plate 51.

In the circumferential direction of the rotating-side end plate portion 51, a portion 77 of the back recess 70 of the present embodiment located rearward of the winding end 62 of the orbiting scroll 60 extends along the winding end 63 of the orbiting scroll 60, while a portion 76 of the back recess 70 located forward of the winding end 62 of the orbiting scroll 60 does not overlap the winding end 63 of the orbiting scroll 60. Therefore, the length of the portion 77 of the back recess 70 extending along the winding end 63 of the orbiting wrap 60 is equal to or greater than the length of the portion 76 of the back recess 70 not overlapping the winding end 63 of the orbiting wrap 60.

Features (4) of the embodiment

In the scroll compressor 10 of the present embodiment, the rear surface recess 70 is open on both the rear surface 53 and the outer peripheral surface 54 of the rotation-side end plate portion 51.

In the rotation-side end plate portion 51 of the present embodiment, the back surface recess 70 is open on both the back surface 53 and the outer peripheral surface 54 of the rotation-side end plate portion 51. The outer peripheral surface 54 of the rotation-side end plate 51 is located outside the orbiting wrap 60 in the radial direction of the rotation-side end plate 51. Therefore, at least a part of the back recess 70 of the present embodiment is located outside the winding end portion 63 of the orbiting-side wrap 60 in the radial direction of the orbiting-side end plate 51. Since the back recess 70 is open to the outer peripheral surface 54 of the rotating-side end plate 51 in the present embodiment, the rigidity of the portion extending along the winding end 63 of the orbiting wrap 60 is reduced.

Features (5) of the embodiment

In the scroll compressor 10 of the present embodiment, the entire rear surface recess 70 is formed outside the orbiting-side wrap 60 in the radial direction of the orbiting-side end plate 51.

In the rotation-side end plate 51 of the present embodiment, the entire back recess 70 is disposed in the outer portion of the orbiting-side wrap 60 in the radial direction of the rotation-side end plate 51.

Features (6) of the embodiment

When the depth of the back surface recessed portion 70 of the scroll compressor 10 of the present embodiment is D and the thickness of the rotation-side end plate portion 51 is T, a relationship of D/T of 0.5 ≦ D/T ≦ 0.8 is satisfied.

Therefore, the rigidity of the portion of the rotating-side end plate 51 where the rear recess 70 is formed is low, and the stress generated in the portion near the root of the winding end portion 63 of the orbiting-side wrap 60 is reduced.

Modification of embodiment

The above embodiment may have the following configuration.

< first modification >

In the orbiting scroll 50 of the present embodiment, the back surface recess 70 of the orbiting side end plate 51 may be formed from the inside of the outer surface 65 of the winding end 63 of the orbiting side wrap 60 to the outside of the outer surface 65 of the winding end 63 in the radial direction of the orbiting side end plate 51. That is, in the orbiting scroll 50 of the present embodiment, at least a part of the back surface recess 70 of the orbiting end plate 51 may be located outside the winding end 63 of the orbiting scroll 60 in the radial direction of the orbiting end plate 51.

In the orbiting scroll 50 of the present modification shown in fig. 8 and 9, an inner peripheral wall surface 71 of the back surface recess 70 is located between the inner surface 64 and the outer surface 65 of the winding end portion 63 of the orbiting-side wrap 60 in the radial direction of the orbiting-side end plate portion 51. In the orbiting scroll 50 of the present modification shown in fig. 10 and 11, an inner peripheral wall surface 71 of the back surface recessed portion 70 is located more inward than an inner surface 64 of the winding end portion 63 of the orbiting-side lap 60 in the radial direction of the orbiting-side end plate portion 51.

In the scroll compressor 10 of the present modification, the back surface recess 70 is formed from the inside of the outer surface 65 of the winding end portion 63 of the orbiting wrap 60 to the outside of the outer surface 65 in the radial direction of the orbiting side end plate portion 51.

In the rotation-side end plate 51 of the present modification, the back recess 70 is formed from the outer portion of the orbiting wrap 60 to a portion inside the outer peripheral surface 54 of the winding end portion 63 of the orbiting wrap 60 in the radial direction of the rotation-side end plate 51. Therefore, the rigidity of the portion of the orbiting-side lap 60 near the winding end 63 is reliably reduced in the orbiting-side end plate 51, and the stress concentration near the base end portion of the winding end 63 of the orbiting-side lap 60 is relaxed.

As shown in fig. 12, in the scroll compressor 10 of the present embodiment and the present modification, the width W of the back surface recessed portion 70 is preferably in the range of WL or more and WH or less (WL ≦ W ≦ WH). WL and WH are values expressed by the following equations.

WL＝R－(Re+te)

WH＝R－(Re－2te)

The expressions "R", "Re", and "te" are explained with reference to fig. 12. A straight line passing through the outermost peripheral edge 66 of the outer surface 65 of the orbiting scroll 60 and the center C of the orbiting side end plate 51 is defined as a straight line IL. "R" is the distance from the center C of the rotation-side end plate 51 to the outer peripheral surface 54 of the rotation-side end plate 51 on the straight line IL. "Re" is the distance from the center C of the rotational end plate 51 to the outer surface 65 of the orbiting wrap 60 on the straight line IL. "te" is the thickness of the orbiting side wrap 60 on the straight line IL.

When WL < W < WH is satisfied, the inner peripheral wall surface 71 of the back surface recess 70 is formed at a position close to the winding end 63 of the orbiting wrap 60. Therefore, by forming the back recess 70, the rigidity of the region of the rotating-side end plate 51 near the winding end 63 of the orbiting-side wrap 60 can be reliably reduced. Therefore, in this case, the stress generated in the vicinity of the root of the winding end portion 63 of the orbiting wrap 60 can be reduced, and damage to the orbiting wrap 60 can be avoided.

< second modification >

As shown in fig. 13, in the orbiting scroll 50 of the present embodiment, the entire back surface recessed portion 70 of the orbiting side end plate portion 51 may extend along the winding end portion 63 of the orbiting side wrap 60.

The front wall surface 73 of the rear recess 70 of the present modification is located behind the winding end 62 of the orbiting wrap 60 in the circumferential direction of the orbiting end plate 51. In other words, the front wall surface 73 of the rear recess 70 of the present modification is located on the rear side of the winding end 62 of the orbiting wrap 60 in the extending direction of the orbiting wrap 60. Therefore, in the present modification, the entire back recess 70 is located on the rear side of the winding end 62 of the orbiting-side wrap 60 in the circumferential direction of the orbiting-side end plate 51. In other words, in the present modification, the entire back recess 70 is located on the rear side of the winding end 62 of the orbiting wrap 60 in the extending direction of the orbiting wrap 60.

As shown in fig. 14, the length of the back surface recess 70 in the circumferential direction of the rotation-side end plate 51 in the present modification may be longer than the length of the back surface recess 70 in the circumferential direction of the rotation-side end plate 51 shown in fig. 13. The length of the back surface recess 70 shown in fig. 14 in the circumferential direction of the rotation-side end plate portion 51 is substantially the same as the length of the back surface recess 70 shown in fig. 5 in the circumferential direction of the rotation-side end plate portion 51.

In the orbiting scroll 50 of the present modification, the inner peripheral wall surface 71 of the rear surface recess 70 is positioned outside the outer surface 65 of the orbiting wrap 60 in the radial direction of the orbiting end plate 51. In the rotation-side end plate 51 of the orbiting scroll 50 of the present modification, the back recess 70 is disposed outside the outer surface 65 of the orbiting scroll 60 in the radial direction of the rotation-side end plate 51.

< third modification >

As shown in fig. 15, in the orbiting scroll 50 of the present embodiment, the back surface recess 70 of the orbiting side end plate 51 may be opened only in the back surface 53 of the orbiting side end plate 51. That is, the back surface recess 70 of the present modification is not open to the outer peripheral surface 54 of the rotation-side end plate 51, and the outer peripheral side wall surface 72 of the back surface recess 70 is positioned radially inward of the outer peripheral surface 54 of the rotation-side end plate 51.

< fourth modification >

As shown in fig. 16, in the rotary scroll 50 of the present embodiment, the depth of the back surface recess 70 of the rotation-side end plate 51 may be gradually reduced toward the radially inner side of the rotation-side end plate 51. In this case, the bottom wall surface 75 of the rear surface recess 70 is an inclined surface.

< fifth modification >

The compression mechanism 30 of the present embodiment is not limited to the asymmetric scroll structure in which the fixed wrap 42 is longer than the orbiting wrap 60. The compression mechanism 30 of the present embodiment may have a symmetrical scroll structure in which the length of the fixed wrap 42 and the orbiting wrap 60 is equal.

The embodiments and modifications have been described above, but it is understood that various changes and modifications can be made without departing from the spirit and scope of the claims. The above embodiments and modifications may be appropriately combined and replaced as long as the functions of the objects of the present disclosure are not affected.

Industrial applicability-

In summary, the present disclosure is useful for scroll compressors.

-description of symbols-

10 scroll compressor

40 fixed scroll

42 static side scroll

50-rotation scroll

51 rotating side end plate part

52 (of the rotating-side end plate portion)

53 (of the rotating-side end plate)

54 (of the rotating-side end plate portion)

60 rotating side scroll

62 (of the orbiting side wrap) winding end

63 (of orbiting side wrap) winding completion part

65 (of the orbiting scroll) outer side surface

70 back recess.