Scroll type fluid machine

Abstract

The invention provides a scroll type fluid machine capable of reducing suction loss. A scroll compressor is provided with: a fixed scroll (11) having an end plate (17), a scroll-shaped wrap part (18) provided upright on one surface of the end plate (17), and a suction hole (19) passing through the end plate (17); an orbiting scroll (12) having an end plate (25) and a spiral wrap part (26) provided upright on one surface of the end plate (25) so as to face the fixed scroll (11); and a drive shaft (13) that rotates the orbiting scroll (12) with respect to the fixed scroll (11). A suction hole (19) of the fixed scroll (11) is disposed between a first closing start position (A) and a second closing start position (B), and a wrap portion (26) of the orbiting scroll (12) is located in a range in the vortex direction of a wrap portion on the outermost peripheral side of a wrap portion (18) of the fixed scroll (11). And a working chamber (34) that is formed between the inner peripheral side of the wrap (26) of the orbiting scroll (11) and the 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 compressor as one of scroll fluid machines. The scroll compressor has a fixed scroll, a rotating scroll, and a drive shaft that rotates the rotating scroll relative to the fixed scroll. The fixed scroll has an end plate, a spiral volute (wrap) that stands upright on one side of the end plate, and an intake hole and a discharge hole that penetrate the end plate. The rotating scroll has an end plate and a spiral volute that stands upright on one side of the end plate in a manner facing the fixed scroll.

[0003] The suction hole of the fixed scroll is arranged between the first closed starting position (specifically, the position where the swirl end end of the swirl tooth portion of the rotating scroll contacts the swirl tooth portion of the fixed scroll) and the second closed starting position (specifically, the position where the swirl end end of the swirl tooth portion of the fixed scroll contacts the swirl tooth portion of the rotating scroll), and in the range of the swirl direction of the swirl tooth portion where the swirl tooth portion of the rotating scroll is located closer to the outermost side than the swirl tooth portion of the fixed scroll.

[0004] A plurality of first working chambers are formed between the inner peripheral side of the spiral tooth portion of the rotating scroll and the outer peripheral side of the spiral tooth portion of the fixed scroll, and a first suction flow path is formed on the outermost peripheral side of the spiral tooth portion of the rotating scroll. As the spiral tooth portion of the rotating scroll moves, the first working chamber moves in the spiral direction of the spiral tooth portion, and performs a suction process, a compression process, and a discharge process in sequence. The first working chamber of the suction process inhales gas through the suction hole of the fixed scroll and the first suction flow path. The first working chamber of the compression process compresses the gas. The first working chamber of the discharge process discharges 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 volute portion of the fixed scroll and the outer peripheral side of the volute portion of the rotating scroll, and a second suction flow path is formed on the outermost peripheral side of the volute portion of the rotating scroll. As the volute portion of the rotating scroll moves, the second working chamber moves in the vortex direction of the volute portion, and performs an intake process, a compression process, and a discharge process in sequence. The second working chamber of the intake process inhales gas through the intake hole of the fixed scroll and the second intake flow path. The second working chamber of the compression process compresses the gas. The second working chamber of the discharge process discharges compressed gas through the discharge hole of the fixed scroll.

[0006] Although the cross-sectional area of ​​the second suction flow path increases as the spiral tooth portion of the rotating scroll moves, the cross-sectional area of ​​the first suction flow path decreases. Therefore, in Patent Document 1, a groove is formed in the non-sliding area of ​​the end plate of the fixed scroll to expand the cross-sectional area of ​​the first suction flow path. This reduces the suction loss.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2008-185020 Summary of the invention

[0010] Technical problem to be solved by the invention

[0011] In Patent Document 1, a groove is formed in a non-sliding region of an end plate of a fixed scroll to increase the cross-sectional area of ​​the first suction flow path, thereby reducing the suction loss. However, such a reduction has a limit.

[0012] The present invention has been made in view of the above circumstances, and one of the objects thereof is to reduce the suction loss.

[0013] Technical solutions to solve problems

[0014] In order to solve the above-mentioned problems, the structure described in the scope of the present invention is applied. The present invention includes multiple solutions for solving the above-mentioned problems. If one example is cited, the scroll fluid machinery includes: a fixed scroll, which has an end plate, a spiral vortex tooth portion erected on one side of the end plate, and a suction hole passing through the end plate; a rotating scroll, which has an end plate and a spiral vortex tooth portion erected on one side of the end plate in a manner opposite to the fixed scroll; and a drive shaft, which causes the rotating scroll to rotate relative to the fixed scroll, wherein the suction hole of the fixed scroll is arranged on the vortex tooth portion of the rotating scroll. The swirl tooth portion of the rotating scroll is intermittently connected to the working chamber formed between the inner peripheral side of the swirl tooth portion of the rotating scroll and the outer peripheral side of the swirl tooth portion of the fixed scroll, and the swirl direction of the swirl tooth portion of the rotating scroll is within the range of the swirl direction of the swirl tooth portion of the rotating scroll that is closer to the outermost peripheral side of the swirl tooth portion of the fixed scroll.

[0015] Effects of the Invention

[0016] According to the present invention, it is possible to reduce the suction loss.

[0017] In addition, problems, structures, and effects other than those described above will become clear from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a side view showing the structure of a scroll compressor according to an embodiment of the present invention.

[0019] Figure 2 This is an axial cross-sectional view showing the structure of a scroll compressor according to an embodiment of the present invention.

[0020] Figure 3A yes Figure 2 The radial cross-sectional view along arrow III-III shows the case where the crank angle of the drive shaft is 0 degrees.

[0021] Figure 3B yes Figure 2 The radial cross-sectional view taken along arrow III-III shows the case where the crank angle of the drive shaft is 90 degrees.

[0022] Figure 3C yes Figure 2 The radial cross-sectional view taken along arrow III-III shows a case where the crank angle of the drive shaft is 180 degrees.

[0023] Figure 3D yes Figure 2 The radial cross-sectional view taken along arrow III-III shows a case where the crank angle of the drive shaft is 270 degrees.

[0024] Figure 4 yes Figure 3D A partial enlarged cross-sectional view of portion IV.

[0025] Figure 5 and Figure 4 Correspondingly, it is a diagram for explaining the arrangement relationship between the suction hole of the fixed scroll and the tip seal of the orbiting scroll.

[0026] Figure 6 It is a partially enlarged cross-sectional view of a first modified example to which the present invention is applied.

[0027] Figure 7 It is a partially enlarged cross-sectional view of a second modified example to which the present invention is applied. DETAILED DESCRIPTION

[0028] use Figure 1 to Figure 5 An embodiment to which the present invention is applied will be described.

[0029] Figure 1 It is a side view showing the structure of the scroll compressor according to the present embodiment. Figure 2 It is an axial cross-sectional view showing the structure of the scroll compressor according to the present embodiment. Figure 3A to Figure 3D yes Figure 2 The radial cross-sectional views along arrows III-III respectively represent the cases where the crank angles of the drive shaft are 0 degrees, 90 degrees, 180 degrees, and 270 degrees. Figure 4 yes Figure 3D A partial enlarged cross-sectional view of portion IV. Figure 5 Corresponds to Figure 4 , is a diagram for explaining the relationship between the suction hole of the fixed scroll and the top seal of the orbiting scroll.

[0030] The scroll compressor of this embodiment includes a housing 10, a fixed scroll 11, a rotating scroll 12, a drive shaft 13, a cooling fan 14, and a duct 15. The fixed scroll 11 is connected to the opening side ( Figure 1 and Figure 2 The rotating scroll 12 is housed in the housing 10. The drive shaft 13 is rotatably supported by a bearing 16 in the housing 10. The cooling fan 14 rotates together with the drive shaft 13 to generate cooling air. Although only a portion of the duct 15 is shown in the figure, it derives the cooling air generated by the cooling fan 14.

[0031] The fixed scroll 11 has: a substantially circular end plate 17; a vertically disposed surface of the end plate 17 ( Figure 2 The left side of the spiral vortex tooth portion 18; through the end plate 17 in a direction perpendicular to the end plate 17 ( Figure 2 and a discharge hole 20 extending through the end plate 17 in a direction perpendicular to one side 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.

[0032] The fixed scroll 11 also has an opposite surface ( Figure 2 The plurality of cooling fins 23 are provided on the right side of the spool, and a cover 24 is mounted on the front end side of the cooling fins 23. The cooling air from the duct 15 flows in the flow path formed by the cooling fins 23 and the cover 24. Thus, the fixed scroll 11 is cooled.

[0033] The rotating scroll 12 has: a substantially circular end plate 25; a surface ( Figure 2 The right side of the spiral volute portion 26; the opposite side of the end plate 25 ( Figure 2 and a plate 28 mounted on the front end side of the cooling fins 27. The cooling air from the duct 15 flows in the flow path formed by the cooling fins 27 and the plate 28. Thus, the rotating scroll 12 is cooled.

[0034] The lap portion 26 of the orbiting scroll 12 is arranged symmetrically with the lap portion 18 of the fixed scroll 11. A groove 29 is formed on the front end side of the lap portion 26 of the orbiting scroll 12 (see Figure 5 ), insert the top seal (sliding member) 30 into the groove 29 (refer to Figure 5 ), the top seal 30 contacts the end plate 17 of the fixed scroll 11. Similarly, a groove is formed on the front end side of the spiral tooth portion 18 of the fixed scroll 11, and a top seal is inserted into the groove, and the top seal contacts the end plate 25 of the rotating scroll 12. Thereby, the sealing performance of the working chamber described later is improved.

[0035] On one end side of the drive shaft 13 ( Figure 1 and Figure 2 A crank portion 31 is provided on the right side of the drive shaft 13. The center O2 of the crank portion 31 of the drive shaft 13 is eccentric from the center O1 of the drive shaft 13, and is connected to the boss portion of the plate 28 of the rotating scroll 12 via the rotating bearing 32.

[0036] The other end side of the drive shaft 13 ( Figure 1 and Figure 2 The left side of the housing 10 protrudes outside the housing 10, and a pulley 33 is provided. A belt (not shown) is laid between a pulley (not shown) provided on the rotating shaft (not shown) of the motor and the pulley 33. As a result, the rotational force of the motor is transmitted to drive the shaft 13 to rotate, and the rotating scroll 12 rotates relative to the fixed scroll 11. In addition, a self-rotation prevention mechanism for preventing the self-rotation of the rotating scroll 12 is provided in the housing 10.

[0037] The crank angle of the drive shaft 13 is the rotation angle of the straight line connecting the above-mentioned centers O1 and O2, as shown in FIG. Figure 3A As shown, the swirl end end of the volute portion 26 of the rotating scroll 12 contacts the volute portion 18 of the fixed scroll 11, and the angle at which the swirl end end of the volute portion 18 of the fixed scroll 11 contacts the volute portion 26 of the rotating scroll 12 is used as a reference (0 degrees).

[0038] The suction hole 19 of the fixed scroll 11 is arranged at Figure 3AThe first closure start position A (specifically, the position where the swirl end end of the volute 26 of the rotating scroll 12 contacts the volute 18 of the fixed scroll 11) and the second closure start position B (specifically, the position where the swirl end end of the volute 18 of the fixed scroll 11 contacts the volute 26 of the rotating scroll 12) are shown, and the swirl direction range of the volute 18 of the rotating scroll 12 where the volute 26 of the rotating scroll 12 is closer to the outermost peripheral side than the volute 18 of the fixed scroll 11 (in other words, the circumferential range of the drive shaft 13). In addition, in the present embodiment, the suction hole 19 of the fixed scroll 11 is arranged at a position in the swirl direction of the volute 18 (in other words, the circumferential position of the drive shaft 13) which is between the first closure start position A and the second closure start position B.

[0039] On the inner circumferential side of the lap portion 26 of the orbiting scroll 12 (specifically, Figure 3B The inner surface CD shown in FIG. 1 is connected to the outer peripheral side of the volute portion 18 of the fixed scroll 11 (in detail, Figure 3B A plurality of first working chambers 34 are formed between the outer surfaces FG shown in the figure, and a first suction flow path 35 is formed on the outermost peripheral side of the lap portion 26 of the orbiting scroll 12.

[0040] As the volute 26 of the rotating scroll 12 moves, the first working chamber 34 moves in the volute direction of the volute 26, and the suction process, the compression process, and the discharge process are sequentially performed. Specifically, for example, when the crank angle of the drive shaft 13 is 0 to 360 degrees (in other words, during one rotation of the drive shaft 13), the suction process of sucking 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 is performed. When the crank angle of the drive shaft 13 is 360 to 1170 degrees (in other words, until the crank angle of the drive shaft 13 reaches 90 degrees after three rotations), the compression process of compressing (pressurizing) gas is performed. When the crank angle of the drive shaft 13 is 1170 degrees or more, the discharge process of discharging compressed gas through the discharge hole 20 of the fixed scroll 11 and the discharge pipe 22 is performed.

[0041] On the inner circumferential side of the volute portion 18 of the fixed scroll 11 (specifically, Figure 3B The inner surface HG shown in FIG. 1 is connected to the outer peripheral side of the volute portion 26 of the orbiting scroll 12 (in detail, Figure 3B A plurality of second working chambers 36 are formed between the outer surfaces ED shown in the figure, and a second suction flow path 37 is formed on the outermost peripheral side of the volute portion 26 of the orbiting scroll 12.

[0042] As the volute 26 of the rotating scroll 12 moves, the second working chamber 36 moves in the volute direction of the volute 26, and the suction process, compression process and discharge process are performed in sequence. Specifically, for example, when the crank angle of the drive shaft 13 is 0 to 360 degrees (in other words, during one rotation of the drive shaft 13), the suction process of sucking gas through the suction filter 21, the suction hole 19 of the fixed scroll 11 and the second suction flow path 37 is performed. When the crank angle of the drive shaft 13 is 360 to 1170 degrees (in other words, until the crank angle of the drive shaft 13 reaches 90 degrees after three rotations of the drive shaft 13), the compression process of compressed gas is performed. When the crank angle of the drive shaft 13 is 1170 degrees or more, the discharge process of discharging compressed gas through the discharge hole 20 of the fixed scroll 11 and the discharge pipe 22 is performed.

[0043] As the volute 26 of the rotating scroll 12 moves, the cross-sectional area of ​​the second suction flow path 37 increases, but the cross-sectional area of ​​the first suction flow path 35 decreases. Therefore, as a feature of the present embodiment, the suction hole 19 of the fixed scroll 11 is intermittently directly connected to the first working chamber 34 of the suction process. In detail, the suction hole 19 of the fixed scroll 11 has an opening 19a that opens on one side of the end plate 17, and the opening 19a partially overlaps with the moving range of the volute 26 of the rotating scroll 12. In other words, the opening 19a of the suction hole 19 of the fixed scroll 11 partially overlaps with the moving range of the first working chamber 34 of the suction process.

[0044] When the crank angle of the drive shaft 13 is in the first range (e.g., 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 with the first working chamber 34 of the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is connected to the first working chamber 34 of the suction process through the first suction flow path 35 from the entire opening 19a.

[0045] On the other hand, for example, when the crank angle of the drive shaft 13 is in the second range (e.g., 225 to 315 degrees), a portion of the opening 19a of the suction hole 19 of the fixed scroll 11 (the portion on the inner side in the radial direction of the drive shaft 13) overlaps with the first working chamber 34 of the suction process, and the other portion (the portion on the outer side in the radial direction of the drive shaft 13) does not overlap with the first working chamber 34 of the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is directly connected to the first working chamber 34 of the suction process from a portion of the opening 19a, and is connected to the first working chamber 34 of the suction process from the other portion of the opening 19a via the first suction flow path 35. As a result, compared with the case where the suction hole 19 of the fixed scroll 11 is not directly connected to the first working chamber 34 of the suction process, it is possible to reduce the suction loss.

[0046] In addition, in the present embodiment, the suction hole 19 of the fixed scroll 11 does not overlap with the end portion (the end portion on the outer side in the swirl direction) of the top seal 30 inserted into the groove 29 of the swirl tooth portion 26 of the orbiting scroll 12, but intermittently overlaps with other portions of the top seal 30 (see Figure 5 ). Therefore, unlike the case where the suction hole 19 of the fixed scroll 11 overlaps with the end of the tip seal 30, it is possible to prevent the tip seal 30 from falling off from the groove 29 of the volute portion 26.

[0047] In addition, in the above-mentioned embodiment, the case where the opening 19a of the suction hole 19 of the fixed scroll 11 is a trapezoidal shape is described as an example, but it is not limited to this. Figure 6 As shown in the first modified example, the opening 19a of the suction hole 19 of the fixed scroll 11 can also be a comb-tooth shape branched in the spiral direction of the spiral tooth portion. In this modified example, the area where the top seal 30 inserted in the groove 29 of the spiral tooth portion 26 of the rotating scroll 12 overlaps with the opening 19a is reduced, which can further prevent the top seal 30 from falling off from the groove 29 of the spiral tooth portion 26.

[0048] In addition, in the above-mentioned embodiment, the case where the suction hole 19 of the fixed scroll 11 has a single opening 19a opened on one side of the end plate 17 is described as an example, but the present invention is not limited to this. Figure 7 As shown in the second modified example, the suction hole 19 of the fixed scroll 11 may include a plurality of openings 19b and 19c that open on one surface of the end plate 17 and are separated from each other.

[0049] In this modification, when the crank angle of the drive shaft 13 is in the first range (e.g., 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 with the first working chamber 34 of the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is connected to the first working chamber 34 of the suction process through the openings 19b and 19c via the first suction flow path 35.

[0050] On the other hand, for example, when the crank angle of the drive shaft 13 is in the second range (e.g., 225 to 315 degrees), the opening 19b of the suction hole 19 of the fixed scroll 11 overlaps with the first working chamber 34 of the suction process, and the opening 19c does not overlap with the first working chamber 34 of the suction process. Therefore, the suction hole 19 of the fixed scroll 11 is directly connected to the first working chamber 34 of the suction process from the opening 19b, and is connected to the first working chamber 34 of the suction process from the opening 19c via the first suction flow path 35. As a result, compared with the case where the suction hole 19 of the fixed scroll 11 is not directly connected to the first working chamber 34 of the suction process, it is possible to reduce the suction loss.

[0051] In this modification, the overlapping area between the tip seal 30 inserted into the groove 29 of the wrap 26 of the orbiting scroll 12 and the openings 19 b and 19 c is reduced, thereby further preventing the tip seal 30 from falling out of the groove 29 of the wrap 26 .

[0052] In addition, the above description takes the case where the present invention is applied to a scroll compressor as one of scroll fluid machines as an example, but the invention is not limited thereto and can also be applied to other scroll fluid machines (specifically, a scroll vacuum pump, a scroll expander, etc.).

[0053] Description of Reference Numerals

[0054] 11...fixed scroll member, 12...rotating scroll member, 13...driving shaft, 17...end plate, 18...volute tooth portion, 19...suction hole, 19a, 19b, 19c...opening, 25...end plate, 26...volute tooth portion, 29...groove, 30...top seal, 34...first working chamber, 35...first suction flow path.

Claims

1. A scroll fluid machine, comprising: A fixed scroll member having an end plate, a spiral volute portion erected on one surface of the end plate, and a suction hole penetrating the end plate; an orbiting scroll having an end plate and a spiral volute portion erected on one surface of the end plate so as to face the fixed scroll; and a drive shaft that causes the orbiting scroll to rotate relative to the fixed scroll, The scroll fluid machine is characterized in that: The suction hole of the fixed scroll is arranged between a first closed starting position where the swirl end end of the swirl tooth portion of the rotating scroll contacts the swirl tooth portion of the fixed scroll and a second closed starting position where the swirl end end of the swirl tooth portion of the fixed scroll contacts the swirl tooth portion of the rotating scroll, and in a range of the swirl direction of the swirl tooth portion of the rotating scroll that is closer to the outermost side of the swirl tooth portion of the fixed scroll, and is intermittently directly connected to a working chamber formed between the inner peripheral side of the swirl tooth portion of the rotating scroll and the outer peripheral side of the swirl tooth portion of the fixed scroll.

2. The scroll fluid machine according to claim 1, characterized in that: The suction hole of the fixed scroll has an opening opened on the one surface of the end plate of the fixed scroll, and when the crank angle of the drive shaft is in a first range, the suction hole is connected to the working room via a suction flow path from the entire opening, and when the crank angle of the drive shaft is in a second range, it is directly connected to the working room from a part of the opening, and is connected to the working room via the suction flow path from the other part of the opening.

3. The scroll fluid machine according to claim 2, characterized in that: The opening has a comb-teeth shape branching in the spiral direction of the spiral tooth portion.

4. The scroll fluid machine according to claim 1, characterized in that: The suction hole of the fixed scroll member has a first opening and a second opening which are open on one surface of the end plate of the fixed scroll member and are separated from each other. When the crank angle of the drive shaft is in a first range, the suction hole is connected to the working chamber via a suction flow path from the first opening and the second opening. When the crank angle of the drive shaft is in a second range, the suction hole is directly connected to the working chamber from the first opening, and is connected to the working chamber from the second opening via the suction flow path.

5. The scroll fluid machine according to claim 1, characterized in that: The orbiting scroll further includes a slider inserted into a groove formed on the front end side of the volute portion. The suction hole of the fixed scroll does not overlap with an end portion of the slider, but intermittently overlaps with other portions of the slider.

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