Scroll-type fluid machine

Abstract

To provide a scroll-type fluid machine capable of reducing a suction loss. A scroll-type compressor includes: a fixed scroll 11 that has an end plate 17, a spiral-shaped wrap 18 erected on one surface of the end plate 17, and a suction hole 19 bored into the end plate 17; an orbiting scroll 12 that has an end plate 25 and a spiral-shaped wrap 26 erected on one surface of the end plate 25 so as to face the fixed scroll 11; and a driving shaft 13 that causes the orbiting scroll 12 to orbit relative to the fixed scroll 11. The suction hole 19 of the fixed scroll 11 is arranged in a winding direction range of the wrap in which range the wrap 26 of the orbiting scroll 12 is located on an outermost peripheral side relative to the wrap 18 of the fixed scroll 11 between a first confinement start position A and a second confinement start position B, and the suction hole 19 of the fixed scroll 11 is intermittently in direct communication with a working chamber 34 formed between an inner peripheral side of the wrap 26 of the orbiting scroll 12 and an outer peripheral side of the wrap 18 of the fixed scroll 11.

Description

Technical Field

[0001] The present invention relates to a scroll-type fluid machine.Background Art

[0002] Patent Document 1 discloses a scroll-type compressor that is one of scroll-type fluid machines. The scroll-type compressor includes a fixed scroll, an orbiting scroll, and a driving shaft that causes the orbiting scroll to orbit relative to the fixed scroll. The fixed scroll has an end plate, a spiral-shaped wrap erected on one surface of the end plate, and a suction hole and a discharge hole bored into the end plate. The orbiting scroll has an end plate and a spiral-shaped wrap erected on one surface of the end plate so as to face the fixed scroll.

[0003] The suction hole of the fixed scroll is arranged in a winding direction range of the wrap in which range the wrap of the orbiting scroll is located on the outermost peripheral side relative to the wrap of the fixed scroll between a first confinement start position (specifically, the position where the winding end of the wrap of the orbiting scroll is brought into contact with the wrap of the fixed scroll) and a second confinement start position (specifically, the position where the winding end of the wrap of the fixed scroll is brought into contact with the wrap of the orbiting scroll).

[0004] A plurality of first working chambers are formed between the inner peripheral side of the wrap of the orbiting scroll and the outer peripheral side of the wrap of the fixed scroll, and a first suction flow path is formed on the outermost peripheral side of the wrap of the orbiting scroll. Along with the movement of the wrap of the orbiting scroll, the first working chamber moves in the winding direction of the wrap and sequentially performs a suction process, a compression process, and a discharge process. The first working chamber in the suction process sucks in gas through the suction hole of the fixed scroll and the first suction flow path. The first working chamber in the compression process compresses the gas. The first working chamber in the discharge process discharges the compressed gas through the discharge hole of the fixed scroll.

[0005] A plurality of second working chambers are formed between the inner peripheral side of the wrap of the fixed scroll and the outer peripheral side of the wrap of the orbiting scroll, and a second suction flow path is formed on the outermost peripheral side of the wrap of the orbiting scroll. Along with the movement of the wrap of the orbiting scroll, the second working chamber moves in the winding direction of the wrap and sequentially performs a suction process, a compression process, and a discharge process. The second working chamber in the suction process sucks in gas through the suction hole of the fixed scroll and the second suction flow path. The second working chamber in the compression process compresses the gas. The second working chamber in the discharge process discharges the compressed gas through the discharge hole of the fixed scroll.

[0006] Along with the movement of the wrap of the orbiting scroll, the cross-sectional area of the second suction flow path becomes large, but the cross-sectional area of the first suction flow path becomes small. Therefore, in Patent Document 1, a groove is formed in a non-sliding region of the end plate of the fixed scroll to expand the cross-sectional area of the first suction flow path. Thus, a suction loss is reduced.Prior Art DocumentPatent Document

[0007] Patent Document 1: JP-2008-185020-ASummary of the InventionProblem to be Solved by the Invention

[0008] In Patent Document 1, a suction loss is reduced by forming the groove in the non-sliding region of the end plate of the fixed scroll to expand the cross-sectional area of the first suction flow path, but the reduction is limited.

[0009] The present invention has been made in view of the foregoing, and one of the objects thereof is to reduce a suction loss.Means for Solving the Problem

[0010] In order to solve the above problems, the configuration described in claims is applied. The present invention includes a plurality of means for solving the above problems, and an example thereof is a scroll-type fluid machine including: a fixed scroll that has an end plate, a spiral-shaped wrap erected on one surface of the end plate, and a suction hole bored into the end plate; an orbiting scroll that has an end plate and a spiral-shaped wrap erected on one surface of the end plate so as to face the fixed scroll; and a driving shaft that causes the orbiting scroll to orbit relative to the fixed scroll, in which the suction hole of the fixed scroll is arranged in a winding direction range of the wrap in which range the wrap of the orbiting scroll is located on an outermost peripheral side relative to the wrap of the fixed scroll between a first confinement start position where a winding end of the wrap of the orbiting scroll is brought into contact with the wrap of the fixed scroll and a second confinement start position where a winding end of the wrap of the fixed scroll is brought into contact with the wrap of the orbiting scroll, the suction hole being intermittently in direct communication with a working chamber formed between an inner peripheral side of the wrap of the orbiting scroll and an outer peripheral side of the wrap of the fixed scroll.Advantages of the Invention

[0011] According to the present invention, a suction loss can be reduced.

[0012] It should be noted that problems, configurations, and effects other than those described above will be clarified by the following description.Brief Description of the Drawings

[0013] FIG. 1 is a side view for depicting a structure of a scroll-type compressor in one embodiment to which the present invention is applied. FIG. 2 is a cross-sectional view in the axial direction for depicting a structure of the scroll-type compressor in the embodiment to which the present invention is applied. FIG. 3A is a cross-sectional view in the radial direction according to arrows III-III of FIG. 2 and depicts a case where the crank angle of a driving shaft is 0 degree. FIG. 3B is a cross-sectional view in the radial direction according to the arrows III-III of FIG. 2 and depicts a case where the crank angle of the driving shaft is 90 degrees. FIG. 3C is a cross-sectional view in the radial direction according to the arrows III-III of FIG. 2 and depicts a case where the crank angle of the driving shaft is 180 degrees. FIG. 3D is a cross-sectional view in the radial direction according to the arrows III-III of FIG. 2 and depicts a case where the crank angle of the driving shaft is 270 degrees. FIG. 4 is a partially enlarged cross-sectional view of a part IV of FIG. 3D. FIG. 5 corresponds to FIG. 4 and is a diagram for explaining an arrangement relationship between a suction hole of a fixed scroll and a tip seal of an orbiting scroll. FIG. 6 is a partially enlarged cross-sectional view in a first modified example to which the present invention is applied. FIG. 7 is a partially enlarged cross-sectional view in a second modified example to which the present invention is applied. Modes for Carrying Out the Invention

[0014] One embodiment to which the present invention is applied will be described by using FIG. 1 to FIG. 5.

[0015] FIG. 1 is a side view for depicting a structure of a scroll-type compressor in the present embodiment. FIG. 2 is a cross-sectional view in the axial direction for depicting a structure of the scroll-type compressor in the present embodiment. FIG. 3A to FIG. 3D are cross-sectional views in the radial direction according to arrows III-III of FIG. 2 and depict cases where the crank angles of a driving shaft are 0 degree, 90 degrees, 180 degrees, and 270 degrees. FIG. 4 is a partially enlarged cross-sectional view of a part IV of FIG. 3D. FIG. 5 corresponds to FIG. 4 and is a diagram for explaining a relation between a suction hole of a fixed scroll and a tip seal of an orbiting scroll.

[0016] The scroll-type compressor of the present embodiment includes a casing 10, a fixed scroll 11, an orbiting scroll 12, a driving shaft 13, a cooling fan 14, and a duct 15. The fixed scroll 11 is coupled to the opening side (the right side in FIG. 1 and FIG. 2) of the casing 10. The orbiting scroll 12 is housed in the casing 10. The driving shaft 13 is rotatably supported by bearings 16 in the casing 10. The cooling fan 14 rotates together with the driving shaft 13 to generate cooling air. Although only a part of the duct 15 is illustrated, the duct 15 derives the cooling air generated by the cooling fan 14.

[0017] The fixed scroll 11 has a substantially circular-shaped end plate 17, a spiral-shaped wrap 18 erected on one surface (the left side surface in FIG. 2) of the end plate 17, a suction hole 19 bored into the end plate 17 and extending in a direction (the left-right direction of FIG. 2) perpendicular to the above-described one surface of the end plate 17, and a discharge hole 20 bored into the end plate 17 and extending in a direction perpendicular to the above-described one surface of the end plate 17. A suction filter 21 is connected to the suction hole 19 of the fixed scroll 11, and a discharge pipe 22 is connected to the discharge hole 20 of the fixed scroll 11.

[0018] The fixed scroll 11 further has a plurality of cooling fins 23 erected on the opposite surface (the right side surface in FIG. 2) of the end plate 17 and a cover 24 attached to the tip side of the cooling fins 23. Cooling air from the duct 15 flows through a flow path formed by the cooling fins 23 and the cover 24. Thus, the fixed scroll 11 is cooled.

[0019] The orbiting scroll 12 has a substantially circular-shaped end plate 25, a spiral-shaped wrap 26 erected on one surface (the right side surface in FIG. 2) of the end plate 25 so as to face the fixed scroll 11, a plurality of cooling fins 27 erected on the opposite surface (the left side surface in FIG. 2) of the end plate 25, and a plate 28 attached to the tip side of the cooling fins 27. Cooling air from the duct 15 flows through a flow path formed by the cooling fins 27 and the plate 28. Thus, the orbiting scroll 12 is cooled.

[0020] The wrap 26 of the orbiting scroll 12 and the wrap 18 of the fixed scroll 11 are symmetrically arranged. A groove 29 (see FIG. 5) is formed on the tip side of the wrap 26 of the orbiting scroll 12, a tip seal (sliding material) 30 (see FIG. 5) is inserted into the groove 29, and the tip seal 30 is brought into contact with the end plate 17 of the fixed scroll 11. Similarly, a groove is formed on the tip side of the wrap 18 of the fixed scroll 11, and a tip seal is inserted into the groove, and the tip seal is brought into contact with the end plate 25 of the orbiting scroll 12. Thus, the sealing property of working chambers to be described later is enhanced.

[0021] A crank portion 31 is provided on one end side (the right side in FIG. 1 and FIG. 2) of the driving shaft 13. The center O2 of the crank portion 31 of the driving shaft 13 is made eccentric from the center O1 of the driving shaft 13, and is connected to a boss portion of the plate 28 of the orbiting scroll 12 through an orbiting bearing 32.

[0022] The other end side (the left side in FIG. 1 and FIG. 2) of the driving shaft 13 projects outside the casing 10, and is provided with a pulley 33. A belt (not illustrated) is stretched between a pulley (not illustrated) provided at a rotating shaft (not illustrated) of an electric motor and the pulley 33. Thus, the rotating force of the electric motor is transmitted to rotate the driving shaft 13, and the orbiting scroll 12 orbits relative to the fixed scroll 11. It should be noted that a rotation preventing mechanism for preventing rotation of the orbiting scroll 12 is provided in the casing 10.

[0023] The crank angle of the driving shaft 13 is the rotation angle of a straight line connecting the above-described centers O1 and O2 to each other, and as depicted in FIG. 3A, the angle at which the winding end of the wrap 26 of the orbiting scroll 12 is brought into contact with the wrap 18 of the fixed scroll 11 and the winding end of the wrap 18 of the fixed scroll 11 is brought into contact with the wrap 26 of the orbiting scroll 12 is used as a reference (0 degrees).

[0024] The suction hole 19 of the fixed scroll 11 is arranged in a winding direction range of the wrap 18 (in other words, a circumferential direction range of the driving shaft 13) in which range the wrap 26 of the orbiting scroll 12 is located on the outermost peripheral side relative to the wrap 18 of the fixed scroll 11 between a first confinement start position A (specifically, the position where the winding end of the wrap 26 of the orbiting scroll 12 is brought into contact with the wrap 18 of the fixed scroll 11) and a second confinement start position B (specifically, the position where the winding end of the wrap 18 of the fixed scroll 11 is brought into contact with the wrap 26 of the orbiting scroll 12) depicted in FIG. 3A. It should be noted that, in the present embodiment, the suction hole 19 of the fixed scroll 11 is arranged at a position in the winding direction of the wrap 18, which position is in the middle between the first confinement start position A and the second confinement start position B (in other words, a position in the circumferential direction of the driving shaft 13).

[0025] A plurality of first working chambers 34 are formed between the inner peripheral side (specifically, an inner surface CD depicted in FIG. 3B) of the wrap 26 of the orbiting scroll 12 and the outer peripheral side (specifically, an outer surface FG depicted in FIG. 3B) of the wrap 18 of the fixed scroll 11, and a first suction flow path 35 is formed on the outermost peripheral side of the wrap 26 of the orbiting scroll 12.

[0026] In accordance with the movement of the wrap 26 of the orbiting scroll 12, the first working chamber 34 moves in the winding direction of the wrap 26 and sequentially performs a suction process, a compression process, and a discharge process. Specifically, for example, when the crank angle of the driving shaft 13 is 0 to 360 degrees (in other words, during one revolution of the driving shaft 13), the first working chamber performs the suction process for sucking in gas (for example, air) through the suction filter 21, the suction hole 19 of the fixed scroll 11, and the first suction flow path 35. When the crank angle of the driving shaft 13 is 360 to 1170 degrees (in other words, until the crank angle of the driving shaft 13 becomes 90 degrees after the driving shaft 13 makes three revolutions), the first working chamber performs the compression process for compressing (pressurizing) the gas. When the crank angle of the driving shaft 13 is 1170 degrees or more, the first working chamber performs the discharge process for discharging the compressed gas through the discharge hole 20 of the fixed scroll 11 and the discharge pipe 22.

[0027] A plurality of second working chambers 36 are formed between the inner peripheral side (specifically, an inner surface HG depicted in FIG. 3B) of the wrap 18 of the fixed scroll 11 and the outer peripheral side (specifically, an outer surface ED depicted in FIG. 3B) of the wrap 26 of the orbiting scroll 12, and a second suction flow path 37 is formed on the outermost peripheral side of the wrap 26 of the orbiting scroll 12.

[0028] In accordance with the movement of the wrap 26 of the orbiting scroll 12, the second working chamber 36 moves in the winding direction of the wrap 26 and sequentially perform a suction process, a compression process, and a discharge process. Specifically, for example, when the crank angle of the driving shaft 13 is 0 to 360 degrees (in other words, during one revolution of the driving shaft 13), the second working chamber performs the suction process for sucking in gas through the suction filter 21, the suction hole 19 of the fixed scroll 11, and the second suction flow path 37. When the crank angle of the driving shaft 13 is 360 to 1170 degrees (in other words, until the crank angle of the driving shaft 13 becomes 90 degrees after the driving shaft 13 makes three revolutions), the second working chamber performs the compression process for compressing the gas. When the crank angle of the driving shaft 13 is 1170 degrees or more, the second working chamber performs the discharge process for discharging the compressed gas through the discharge hole 20 of the fixed scroll 11 and the discharge pipe 22.

[0029] In accordance with the movement of the wrap 26 of the orbiting scroll 12, the cross-sectional area of the second suction flow path 37 becomes large, but the cross-sectional area of the first suction flow path 35 becomes small. Therefore, as a feature of the present embodiment, the suction hole 19 of the fixed scroll 11 is intermittently in direct communication with the first working chamber 34 in the suction process. Specifically, the suction hole 19 of the fixed scroll 11 has an opening 19a that opens on the above-described one surface of the end plate 17, and the opening 19a partially overlaps the moving range of the wrap 26 of the orbiting scroll 12. In other words, the opening 19a of the suction hole 19 of the fixed scroll 11 partially overlaps the moving range of the first working chamber 34 in the suction process.

[0030] When the crank angle of the driving shaft 13 is in a first range (for example, 0 to 225 degrees and 315 to 360 degrees), the opening 19a of the suction hole 19 of the fixed scroll 11 does not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the entire opening 19a.

[0031] On the other hand, for example, when the crank angle of the driving shaft 13 is in a second range (for example, 225 to 315 degrees), a part of the opening 19a of the suction hole 19 of the fixed scroll 11 (an inner part in the radius direction of the driving shaft 13) overlaps the first working chamber 34 in the suction process, and another part (an outer part in the radius direction of the driving shaft 13) does not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in direct communication with the first working chamber 34 in the suction process from a part of the opening 19a, and is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from another part of the opening 19a. Thus, a suction loss can be reduced as compared with a case where the suction hole 19 of the fixed scroll 11 is not in direct communication with the first working chamber 34 in the suction process.

[0032] In addition, in the present embodiment, the suction hole 19 of the fixed scroll 11 does not overlap the end on the winding end side (the outer end in the winding direction) of the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12, but intermittently overlaps another part of the tip seal 30 (see FIG. 5). Therefore, unlike a case where the suction hole 19 of the fixed scroll 11 overlaps the end of the tip seal 30, falling off of the tip seal 30 from the groove 29 of the wrap 26 can be prevented.

[0033] It should be noted that, in the above-described embodiment, the opening 19a of the suction hole 19 of the fixed scroll 11 has been described as an example of a case where it has a trapezoidal shape, but the present invention is not limited thereto. For example, as in a first modified example depicted in FIG. 6, the opening 19a of the suction hole 19 of the fixed scroll 11 may have a comb-shape branched in the winding direction of the wrap. In the present modified example, the area where the opening 19a overlaps the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12 is made small, and falling off of the tip seal 30 from the groove 29 of the wrap 26 can be further prevented.

[0034] In addition, in the above-described embodiment, the suction hole 19 of the fixed scroll 11 has been described as an example of a case where it has one opening 19a that opens on one surface of the end plate 17, but the present invention is not limited thereto. For example, as in a second modified example depicted in FIG. 7, the suction hole 19 of the fixed scroll 11 may have a plurality of openings 19b and 19c that opens on one surface of the end plate 17 and is separated from each other.

[0035] In the present modified example, when the crank angle of the driving shaft 13 is in the first range (for example, 0 to 225 degrees and 315 to 360 degrees), the openings 19b and 19c of the suction hole 19 of the fixed scroll 11 do not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the openings 19b and 19c.

[0036] On the other hand, for example, when the crank angle of the driving shaft 13 is in the second range (for example, 225 to 315 degrees), the opening 19b of the suction hole 19 of the fixed scroll 11 overlaps the first working chamber 34 in the suction process, and the opening 19c does not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in direct communication with the first working chamber 34 in the suction process from the opening 19b, and is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the opening 19c. Thus, a suction loss can be reduced as compared with a case where the suction hole 19 of the fixed scroll 11 is not in direct communication with the first working chamber 34 in the suction process.

[0037] In addition, in the present modified example, the area where the openings 19b and 19c overlap the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12 is made small, and falling off of the tip seal 30 from the groove 29 of the wrap 26 can be further prevented.

[0038] It should be noted that in the above description, a case where the present invention is applied to the scroll-type compressor that is one of scroll-type fluid machines has been described as an example, but the present invention is not limited thereto. The present invention may be applied to other scroll-type fluid machines (specifically, a scroll-type vacuum pump, a scroll-type expansion machine, and the like).Description of Reference Characters

[0039] 11: Fixed scroll 12: Orbiting scroll 13: Driving shaft 17: End plate 18: Wrap 19: Suction hole 19a, 19b, 19c: Opening 25: End plate 26: Wrap 29: Groove 30: Tip seal 34: First working chamber 35: First suction flow path

Examples

Embodiment Construction

[0014]One embodiment to which the present invention is applied will be described by using FIG. 1 to FIG. 5.

[0015]FIG. 1 is a side view for depicting a structure of a scroll-type compressor in the present embodiment. FIG. 2 is a cross-sectional view in the axial direction for depicting a structure of the scroll-type compressor in the present embodiment. FIG. 3A to FIG. 3D are cross-sectional views in the radial direction according to arrows III-III of FIG. 2 and depict cases where the crank angles of a driving shaft are 0 degree, 90 degrees, 180 degrees, and 270 degrees. FIG. 4 is a partially enlarged cross-sectional view of a part IV of FIG. 3D. FIG. 5 corresponds to FIG. 4 and is a diagram for explaining a relation between a suction hole of a fixed scroll and a tip seal of an orbiting scroll.

[0016]The scroll-type compressor of the present embodiment includes a casing 10, a fixed scroll 11, an orbiting scroll 12, a driving shaft 13, a cooling fan 14, and a duct 15. The fixed scroll ...

Technical Field

[0001] The present invention relates to a scroll-type fluid machine.Background Art

[0002] Patent Document 1 discloses a scroll-type compressor that is one of scroll-type fluid machines. The scroll-type compressor includes a fixed scroll, an orbiting scroll, and a driving shaft that causes the orbiting scroll to orbit relative to the fixed scroll. The fixed scroll has an end plate, a spiral-shaped wrap erected on one surface of the end plate, and a suction hole and a discharge hole bored into the end plate. The orbiting scroll has an end plate and a spiral-shaped wrap erected on one surface of the end plate so as to face the fixed scroll.

[0003] The suction hole of the fixed scroll is arranged in a winding direction range of the wrap in which range the wrap of the orbiting scroll is located on the outermost peripheral side relative to the wrap of the fixed scroll between a first confinement start position (specifically, the position where the winding end of the wrap of the orbiting scroll is brought into contact with the wrap of the fixed scroll) and a second confinement start position (specifically, the position where the winding end of the wrap of the fixed scroll is brought into contact with the wrap of the orbiting scroll).

[0004] A plurality of first working chambers are formed between the inner peripheral side of the wrap of the orbiting scroll and the outer peripheral side of the wrap of the fixed scroll, and a first suction flow path is formed on the outermost peripheral side of the wrap of the orbiting scroll. Along with the movement of the wrap of the orbiting scroll, the first working chamber moves in the winding direction of the wrap and sequentially performs a suction process, a compression process, and a discharge process. The first working chamber in the suction process sucks in gas through the suction hole of the fixed scroll and the first suction flow path. The first working chamber in the compression process compresses the gas. The first working chamber in the discharge process discharges the compressed gas through the discharge hole of the fixed scroll.

[0005] A plurality of second working chambers are formed between the inner peripheral side of the wrap of the fixed scroll and the outer peripheral side of the wrap of the orbiting scroll, and a second suction flow path is formed on the outermost peripheral side of the wrap of the orbiting scroll. Along with the movement of the wrap of the orbiting scroll, the second working chamber moves in the winding direction of the wrap and sequentially performs a suction process, a compression process, and a discharge process. The second working chamber in the suction process sucks in gas through the suction hole of the fixed scroll and the second suction flow path. The second working chamber in the compression process compresses the gas. The second working chamber in the discharge process discharges the compressed gas through the discharge hole of the fixed scroll.

[0006] Along with the movement of the wrap of the orbiting scroll, the cross-sectional area of the second suction flow path becomes large, but the cross-sectional area of the first suction flow path becomes small. Therefore, in Patent Document 1, a groove is formed in a non-sliding region of the end plate of the fixed scroll to expand the cross-sectional area of the first suction flow path. Thus, a suction loss is reduced.Prior Art DocumentPatent Document

[0007] Patent Document 1: JP-2008-185020-ASummary of the InventionProblem to be Solved by the Invention

[0008] In Patent Document 1, a suction loss is reduced by forming the groove in the non-sliding region of the end plate of the fixed scroll to expand the cross-sectional area of the first suction flow path, but the reduction is limited.

[0009] The present invention has been made in view of the foregoing, and one of the objects thereof is to reduce a suction loss.Means for Solving the Problem

[0010] In order to solve the above problems, the configuration described in claims is applied. The present invention includes a plurality of means for solving the above problems, and an example thereof is a scroll-type fluid machine including: a fixed scroll that has an end plate, a spiral-shaped wrap erected on one surface of the end plate, and a suction hole bored into the end plate; an orbiting scroll that has an end plate and a spiral-shaped wrap erected on one surface of the end plate so as to face the fixed scroll; and a driving shaft that causes the orbiting scroll to orbit relative to the fixed scroll, in which the suction hole of the fixed scroll is arranged in a winding direction range of the wrap in which range the wrap of the orbiting scroll is located on an outermost peripheral side relative to the wrap of the fixed scroll between a first confinement start position where a winding end of the wrap of the orbiting scroll is brought into contact with the wrap of the fixed scroll and a second confinement start position where a winding end of the wrap of the fixed scroll is brought into contact with the wrap of the orbiting scroll, the suction hole being intermittently in direct communication with a working chamber formed between an inner peripheral side of the wrap of the orbiting scroll and an outer peripheral side of the wrap of the fixed scroll.Advantages of the Invention

[0011] According to the present invention, a suction loss can be reduced.

[0012] It should be noted that problems, configurations, and effects other than those described above will be clarified by the following description.Brief Description of the Drawings

[0013] FIG. 1 is a side view for depicting a structure of a scroll-type compressor in one embodiment to which the present invention is applied. FIG. 2 is a cross-sectional view in the axial direction for depicting a structure of the scroll-type compressor in the embodiment to which the present invention is applied. FIG. 3A is a cross-sectional view in the radial direction according to arrows III-III of FIG. 2 and depicts a case where the crank angle of a driving shaft is 0 degree. FIG. 3B is a cross-sectional view in the radial direction according to the arrows III-III of FIG. 2 and depicts a case where the crank angle of the driving shaft is 90 degrees. FIG. 3C is a cross-sectional view in the radial direction according to the arrows III-III of FIG. 2 and depicts a case where the crank angle of the driving shaft is 180 degrees. FIG. 3D is a cross-sectional view in the radial direction according to the arrows III-III of FIG. 2 and depicts a case where the crank angle of the driving shaft is 270 degrees. FIG. 4 is a partially enlarged cross-sectional view of a part IV of FIG. 3D. FIG. 5 corresponds to FIG. 4 and is a diagram for explaining an arrangement relationship between a suction hole of a fixed scroll and a tip seal of an orbiting scroll. FIG. 6 is a partially enlarged cross-sectional view in a first modified example to which the present invention is applied. FIG. 7 is a partially enlarged cross-sectional view in a second modified example to which the present invention is applied. Modes for Carrying Out the Invention

[0014] One embodiment to which the present invention is applied will be described by using FIG. 1 to FIG. 5.

[0015] FIG. 1 is a side view for depicting a structure of a scroll-type compressor in the present embodiment. FIG. 2 is a cross-sectional view in the axial direction for depicting a structure of the scroll-type compressor in the present embodiment. FIG. 3A to FIG. 3D are cross-sectional views in the radial direction according to arrows III-III of FIG. 2 and depict cases where the crank angles of a driving shaft are 0 degree, 90 degrees, 180 degrees, and 270 degrees. FIG. 4 is a partially enlarged cross-sectional view of a part IV of FIG. 3D. FIG. 5 corresponds to FIG. 4 and is a diagram for explaining a relation between a suction hole of a fixed scroll and a tip seal of an orbiting scroll.

[0016] The scroll-type compressor of the present embodiment includes a casing 10, a fixed scroll 11, an orbiting scroll 12, a driving shaft 13, a cooling fan 14, and a duct 15. The fixed scroll 11 is coupled to the opening side (the right side in FIG. 1 and FIG. 2) of the casing 10. The orbiting scroll 12 is housed in the casing 10. The driving shaft 13 is rotatably supported by bearings 16 in the casing 10. The cooling fan 14 rotates together with the driving shaft 13 to generate cooling air. Although only a part of the duct 15 is illustrated, the duct 15 derives the cooling air generated by the cooling fan 14.

[0017] The fixed scroll 11 has a substantially circular-shaped end plate 17, a spiral-shaped wrap 18 erected on one surface (the left side surface in FIG. 2) of the end plate 17, a suction hole 19 bored into the end plate 17 and extending in a direction (the left-right direction of FIG. 2) perpendicular to the above-described one surface of the end plate 17, and a discharge hole 20 bored into the end plate 17 and extending in a direction perpendicular to the above-described one surface of the end plate 17. A suction filter 21 is connected to the suction hole 19 of the fixed scroll 11, and a discharge pipe 22 is connected to the discharge hole 20 of the fixed scroll 11.

[0018] The fixed scroll 11 further has a plurality of cooling fins 23 erected on the opposite surface (the right side surface in FIG. 2) of the end plate 17 and a cover 24 attached to the tip side of the cooling fins 23. Cooling air from the duct 15 flows through a flow path formed by the cooling fins 23 and the cover 24. Thus, the fixed scroll 11 is cooled.

[0019] The orbiting scroll 12 has a substantially circular-shaped end plate 25, a spiral-shaped wrap 26 erected on one surface (the right side surface in FIG. 2) of the end plate 25 so as to face the fixed scroll 11, a plurality of cooling fins 27 erected on the opposite surface (the left side surface in FIG. 2) of the end plate 25, and a plate 28 attached to the tip side of the cooling fins 27. Cooling air from the duct 15 flows through a flow path formed by the cooling fins 27 and the plate 28. Thus, the orbiting scroll 12 is cooled.

[0020] The wrap 26 of the orbiting scroll 12 and the wrap 18 of the fixed scroll 11 are symmetrically arranged. A groove 29 (see FIG. 5) is formed on the tip side of the wrap 26 of the orbiting scroll 12, a tip seal (sliding material) 30 (see FIG. 5) is inserted into the groove 29, and the tip seal 30 is brought into contact with the end plate 17 of the fixed scroll 11. Similarly, a groove is formed on the tip side of the wrap 18 of the fixed scroll 11, and a tip seal is inserted into the groove, and the tip seal is brought into contact with the end plate 25 of the orbiting scroll 12. Thus, the sealing property of working chambers to be described later is enhanced.

[0021] A crank portion 31 is provided on one end side (the right side in FIG. 1 and FIG. 2) of the driving shaft 13. The center O2 of the crank portion 31 of the driving shaft 13 is made eccentric from the center O1 of the driving shaft 13, and is connected to a boss portion of the plate 28 of the orbiting scroll 12 through an orbiting bearing 32.

[0022] The other end side (the left side in FIG. 1 and FIG. 2) of the driving shaft 13 projects outside the casing 10, and is provided with a pulley 33. A belt (not illustrated) is stretched between a pulley (not illustrated) provided at a rotating shaft (not illustrated) of an electric motor and the pulley 33. Thus, the rotating force of the electric motor is transmitted to rotate the driving shaft 13, and the orbiting scroll 12 orbits relative to the fixed scroll 11. It should be noted that a rotation preventing mechanism for preventing rotation of the orbiting scroll 12 is provided in the casing 10.

[0023] The crank angle of the driving shaft 13 is the rotation angle of a straight line connecting the above-described centers O1 and O2 to each other, and as depicted in FIG. 3A, the angle at which the winding end of the wrap 26 of the orbiting scroll 12 is brought into contact with the wrap 18 of the fixed scroll 11 and the winding end of the wrap 18 of the fixed scroll 11 is brought into contact with the wrap 26 of the orbiting scroll 12 is used as a reference (0 degrees).

[0024] The suction hole 19 of the fixed scroll 11 is arranged in a winding direction range of the wrap 18 (in other words, a circumferential direction range of the driving shaft 13) in which range the wrap 26 of the orbiting scroll 12 is located on the outermost peripheral side relative to the wrap 18 of the fixed scroll 11 between a first confinement start position A (specifically, the position where the winding end of the wrap 26 of the orbiting scroll 12 is brought into contact with the wrap 18 of the fixed scroll 11) and a second confinement start position B (specifically, the position where the winding end of the wrap 18 of the fixed scroll 11 is brought into contact with the wrap 26 of the orbiting scroll 12) depicted in FIG. 3A. It should be noted that, in the present embodiment, the suction hole 19 of the fixed scroll 11 is arranged at a position in the winding direction of the wrap 18, which position is in the middle between the first confinement start position A and the second confinement start position B (in other words, a position in the circumferential direction of the driving shaft 13).

[0025] A plurality of first working chambers 34 are formed between the inner peripheral side (specifically, an inner surface CD depicted in FIG. 3B) of the wrap 26 of the orbiting scroll 12 and the outer peripheral side (specifically, an outer surface FG depicted in FIG. 3B) of the wrap 18 of the fixed scroll 11, and a first suction flow path 35 is formed on the outermost peripheral side of the wrap 26 of the orbiting scroll 12.

[0026] In accordance with the movement of the wrap 26 of the orbiting scroll 12, the first working chamber 34 moves in the winding direction of the wrap 26 and sequentially performs a suction process, a compression process, and a discharge process. Specifically, for example, when the crank angle of the driving shaft 13 is 0 to 360 degrees (in other words, during one revolution of the driving shaft 13), the first working chamber performs the suction process for sucking in gas (for example, air) through the suction filter 21, the suction hole 19 of the fixed scroll 11, and the first suction flow path 35. When the crank angle of the driving shaft 13 is 360 to 1170 degrees (in other words, until the crank angle of the driving shaft 13 becomes 90 degrees after the driving shaft 13 makes three revolutions), the first working chamber performs the compression process for compressing (pressurizing) the gas. When the crank angle of the driving shaft 13 is 1170 degrees or more, the first working chamber performs the discharge process for discharging the compressed gas through the discharge hole 20 of the fixed scroll 11 and the discharge pipe 22.

[0027] A plurality of second working chambers 36 are formed between the inner peripheral side (specifically, an inner surface HG depicted in FIG. 3B) of the wrap 18 of the fixed scroll 11 and the outer peripheral side (specifically, an outer surface ED depicted in FIG. 3B) of the wrap 26 of the orbiting scroll 12, and a second suction flow path 37 is formed on the outermost peripheral side of the wrap 26 of the orbiting scroll 12.

[0028] In accordance with the movement of the wrap 26 of the orbiting scroll 12, the second working chamber 36 moves in the winding direction of the wrap 26 and sequentially perform a suction process, a compression process, and a discharge process. Specifically, for example, when the crank angle of the driving shaft 13 is 0 to 360 degrees (in other words, during one revolution of the driving shaft 13), the second working chamber performs the suction process for sucking in gas through the suction filter 21, the suction hole 19 of the fixed scroll 11, and the second suction flow path 37. When the crank angle of the driving shaft 13 is 360 to 1170 degrees (in other words, until the crank angle of the driving shaft 13 becomes 90 degrees after the driving shaft 13 makes three revolutions), the second working chamber performs the compression process for compressing the gas. When the crank angle of the driving shaft 13 is 1170 degrees or more, the second working chamber performs the discharge process for discharging the compressed gas through the discharge hole 20 of the fixed scroll 11 and the discharge pipe 22.

[0029] In accordance with the movement of the wrap 26 of the orbiting scroll 12, the cross-sectional area of the second suction flow path 37 becomes large, but the cross-sectional area of the first suction flow path 35 becomes small. Therefore, as a feature of the present embodiment, the suction hole 19 of the fixed scroll 11 is intermittently in direct communication with the first working chamber 34 in the suction process. Specifically, the suction hole 19 of the fixed scroll 11 has an opening 19a that opens on the above-described one surface of the end plate 17, and the opening 19a partially overlaps the moving range of the wrap 26 of the orbiting scroll 12. In other words, the opening 19a of the suction hole 19 of the fixed scroll 11 partially overlaps the moving range of the first working chamber 34 in the suction process.

[0030] When the crank angle of the driving shaft 13 is in a first range (for example, 0 to 225 degrees and 315 to 360 degrees), the opening 19a of the suction hole 19 of the fixed scroll 11 does not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the entire opening 19a.

[0031] On the other hand, for example, when the crank angle of the driving shaft 13 is in a second range (for example, 225 to 315 degrees), a part of the opening 19a of the suction hole 19 of the fixed scroll 11 (an inner part in the radius direction of the driving shaft 13) overlaps the first working chamber 34 in the suction process, and another part (an outer part in the radius direction of the driving shaft 13) does not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in direct communication with the first working chamber 34 in the suction process from a part of the opening 19a, and is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from another part of the opening 19a. Thus, a suction loss can be reduced as compared with a case where the suction hole 19 of the fixed scroll 11 is not in direct communication with the first working chamber 34 in the suction process.

[0032] In addition, in the present embodiment, the suction hole 19 of the fixed scroll 11 does not overlap the end on the winding end side (the outer end in the winding direction) of the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12, but intermittently overlaps another part of the tip seal 30 (see FIG. 5). Therefore, unlike a case where the suction hole 19 of the fixed scroll 11 overlaps the end of the tip seal 30, falling off of the tip seal 30 from the groove 29 of the wrap 26 can be prevented.

[0033] It should be noted that, in the above-described embodiment, the opening 19a of the suction hole 19 of the fixed scroll 11 has been described as an example of a case where it has a trapezoidal shape, but the present invention is not limited thereto. For example, as in a first modified example depicted in FIG. 6, the opening 19a of the suction hole 19 of the fixed scroll 11 may have a comb-shape branched in the winding direction of the wrap. In the present modified example, the area where the opening 19a overlaps the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12 is made small, and falling off of the tip seal 30 from the groove 29 of the wrap 26 can be further prevented.

[0034] In addition, in the above-described embodiment, the suction hole 19 of the fixed scroll 11 has been described as an example of a case where it has one opening 19a that opens on one surface of the end plate 17, but the present invention is not limited thereto. For example, as in a second modified example depicted in FIG. 7, the suction hole 19 of the fixed scroll 11 may have a plurality of openings 19b and 19c that opens on one surface of the end plate 17 and is separated from each other.

[0035] In the present modified example, when the crank angle of the driving shaft 13 is in the first range (for example, 0 to 225 degrees and 315 to 360 degrees), the openings 19b and 19c of the suction hole 19 of the fixed scroll 11 do not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the openings 19b and 19c.

[0036] On the other hand, for example, when the crank angle of the driving shaft 13 is in the second range (for example, 225 to 315 degrees), the opening 19b of the suction hole 19 of the fixed scroll 11 overlaps the first working chamber 34 in the suction process, and the opening 19c does not overlap the first working chamber 34 in the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is in direct communication with the first working chamber 34 in the suction process from the opening 19b, and is in communication with the first working chamber 34 in the suction process through the first suction flow path 35 from the opening 19c. Thus, a suction loss can be reduced as compared with a case where the suction hole 19 of the fixed scroll 11 is not in direct communication with the first working chamber 34 in the suction process.

[0037] In addition, in the present modified example, the area where the openings 19b and 19c overlap the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12 is made small, and falling off of the tip seal 30 from the groove 29 of the wrap 26 can be further prevented.

[0038] It should be noted that in the above description, a case where the present invention is applied to the scroll-type compressor that is one of scroll-type fluid machines has been described as an example, but the present invention is not limited thereto. The present invention may be applied to other scroll-type fluid machines (specifically, a scroll-type vacuum pump, a scroll-type expansion machine, and the like).Description of Reference Characters

[0039] 11: Fixed scroll 12: Orbiting scroll 13: Driving shaft 17: End plate 18: Wrap 19: Suction hole 19a, 19b, 19c: Opening 25: End plate 26: Wrap 29: Groove 30: Tip seal 34: First working chamber 35: First suction flow path

Examples

Embodiment Construction

[0014]One embodiment to which the present invention is applied will be described by using FIG. 1 to FIG. 5.

[0015]FIG. 1 is a side view for depicting a structure of a scroll-type compressor in the present embodiment. FIG. 2 is a cross-sectional view in the axial direction for depicting a structure of the scroll-type compressor in the present embodiment. FIG. 3A to FIG. 3D are cross-sectional views in the radial direction according to arrows III-III of FIG. 2 and depict cases where the crank angles of a driving shaft are 0 degree, 90 degrees, 180 degrees, and 270 degrees. FIG. 4 is a partially enlarged cross-sectional view of a part IV of FIG. 3D. FIG. 5 corresponds to FIG. 4 and is a diagram for explaining a relation between a suction hole of a fixed scroll and a tip seal of an orbiting scroll.

[0016]The scroll-type compressor of the present embodiment includes a casing 10, a fixed scroll 11, an orbiting scroll 12, a driving shaft 13, a cooling fan 14, and a duct 15. The fixed scroll ...

Claims

1. A scroll-type fluid machine comprising: a fixed scroll that has an end plate, a spiral-shaped wrap erected on one surface of the end plate, and a suction hole bored into the end plate; an orbiting scroll that has an end plate and a spiral-shaped wrap erected on one surface of the end plate so as to face the fixed scroll; and a driving shaft that causes the orbiting scroll to orbit relative to the fixed scroll, wherein the suction hole of the fixed scroll is arranged in a winding direction range of the wrap in which range the wrap of the orbiting scroll is located on an outermost peripheral side relative to the wrap of the fixed scroll between a first confinement start position where a winding end of the wrap of the orbiting scroll is brought into contact with the wrap of the fixed scroll and a second confinement start position where a winding end of the wrap of the fixed scroll is brought into contact with the wrap of the orbiting scroll, the suction hole being intermittently in direct communication with a working chamber formed between an inner peripheral side of the wrap of the orbiting scroll and an outer peripheral side of the wrap of the fixed scroll.

2. The scroll-type fluid machine according to claim 1, wherein the suction hole of the fixed scroll has an opening that opens on the one surface of the end plate of the fixed scroll, the suction hole being in communication with the working chamber through a suction flow path from the entire opening when a crank angle of the driving shaft is in a first range, and being in direct communication with the working chamber from a part of the opening and in communication with the working chamber through the suction flow path from another part of the opening when the crank angle of the driving shaft is in a second range.

3. The scroll-type fluid machine according to claim 2, wherein the opening has a comb-shape branched in a winding direction of the wrap.

4. The scroll-type fluid machine according to claim 1, wherein the suction hole of the fixed scroll has a first opening and a second opening that open on the one surface of the end plate of the fixed scroll and are separated from each other, the suction hole being in communication with the working chamber through a suction flow path from the first opening and the second opening when a crank angle of the driving shaft is in a first range, and being in direct communication with the working chamber from the first opening and in communication with the working chamber through the suction flow path from the second opening when the crank angle of the driving shaft is in a second range.

5. The scroll-type fluid machine according to claim 1, wherein the orbiting scroll further has a sliding material inserted into a groove formed on a tip side of the wrap, and the suction hole of the fixed scroll does not overlap an end of the sliding material, but intermittently overlaps another part of the sliding material.

Images