Multistage rotary compressor and refrigeration cycle device

Abstract

The present invention relates to a multi-stage rotary compressor and a refrigeration cycle device. The multi-stage rotary compressor of the present invention includes a housing, a rotary shaft, a driving member, a low-stage suction pipe, a low-stage compression mechanism section, a low-stage discharge pipe, a high-stage suction pipe, a high-stage compression mechanism section, a partition plate, and a bearing. The low-stage compression mechanism section includes a low-stage cylinder that forms a low-stage cylinder chamber, a low-stage roller that is capable of eccentric rotation within the low-stage cylinder chamber, and a low-stage vane that divides the low-stage cylinder chamber into a low-stage suction chamber and a low-stage compression chamber. The high-stage compression mechanism section includes a high-stage cylinder that forms a high-stage cylinder chamber, a high-stage roller that is capable of eccentric rotation within the high-stage cylinder chamber, and a high-stage vane that divides the high-stage cylinder chamber into a high-stage suction chamber and a high-stage compression chamber. The low-stage suction pipe, the low-stage discharge pipe, and the high-stage suction pipe are connected to the same connected member.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to a multistage rotary compressor and a refrigeration cycle device. BACKGROUND

[0002] Conventionally, a multistage rotary compressor that compresses a working fluid in stages is known. For example, a multistage rotary compressor has a rotary shaft, a driving member, a compression member, a low-stage suction pipe, a low-stage discharge pipe, a high-stage suction pipe, and a closed casing. The compression member has a low-stage compression mechanism portion and a high-stage compression mechanism portion.

[0003] The low-stage suction pipe guides the working fluid to the low-stage compression mechanism portion. The low-stage compression mechanism portion compresses the working fluid at a low pressure to an intermediate pressure. The low-stage discharge pipe discharges the working fluid at the intermediate pressure. The high-stage suction pipe guides the discharged working fluid to the high-stage compression mechanism portion. The high-stage compression mechanism portion compresses the working fluid at the intermediate pressure to a high pressure.

[0004] The positional accuracy of the constituent members such as the low-stage suction pipe, the low-stage discharge pipe, and the high-stage suction pipe can possibly affect the reliability of the multistage rotary compressor. Therefore, it is required to improve the positional accuracy of the constituent members.

[0005] Patent Document 1: Japanese Patent No. 4790664 SUMMARY

[0006] The present application aims to provide a multistage rotary compressor and a refrigeration cycle device in which the positional accuracy of the constituent members is high.

[0007] The multistage rotary compressor of the embodiment has a housing, a rotary shaft, a driving member, a low-stage suction pipe, a low-stage compression mechanism section, the above low-stage discharge pipe, the above high-stage suction pipe, a high-stage compression mechanism section, a partition plate, and a pair of bearings. The rotary shaft is housed inside the housing. The driving member rotates the rotary shaft. The low-stage suction pipe guides working fluid from outside the housing. The low-stage compression mechanism section compresses the working fluid introduced from the low-stage suction pipe to an intermediate pressure. The low-stage discharge pipe discharges the working fluid of the intermediate pressure compressed by the low-stage compression mechanism section to outside the housing. The high-stage suction pipe guides the working fluid of the intermediate pressure discharged from the low-stage discharge pipe. The high-stage compression mechanism section compresses the working fluid of the intermediate pressure introduced from the high-stage suction pipe to a high pressure. The partition plate separates the low-stage compression mechanism section from the high-stage compression mechanism section. The pair of bearings axially supports the rotary shaft. The low-stage compression mechanism section has a low-stage side cylinder, a low-stage side roller, and a low-stage side vane. The low-stage side cylinder forms a low-stage side cylinder chamber. The low-stage side roller is eccentrically rotatable inside the low-stage side cylinder chamber. The low-stage side vane divides the low-stage side cylinder chamber into a low-stage side suction chamber and a low-stage side compression chamber. The high-stage compression mechanism section has a high-stage side cylinder, a high-stage side roller, and a high-stage side vane. The high-stage side cylinder forms a high-stage side cylinder chamber. The high-stage side roller is eccentrically rotatable inside the high-stage side cylinder chamber. The high-stage side vane divides the high-stage side cylinder chamber into a high-stage side suction chamber and a high-stage side compression chamber. The low-stage suction pipe, the low-stage discharge pipe, and the high-stage suction pipe are connected to the same connected member. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a schematic configuration view of a refrigeration cycle device including the rotary compressor of the first embodiment.

[0009] Figure 2 is a cross-sectional view along the I-I line of Figure 1 .

[0010] Figure 3 is a cross-sectional view along the III-III line of Figure 2 .

[0011] Figure 4 is a cross-sectional view along the II-II line of Figure 1 .

[0012] Figure 5 is a configuration view of a modification example of the low-stage compression mechanism section.

[0013] Figure 6 is a configuration view of a modification example of the high-stage compression mechanism section.

[0014] Figure 7is a sectional view of the rotary compressor of the 2nd embodiment.

[0015] Figure 8 is a plan view of the rotary compressor of the 2nd embodiment.

[0016] Figure 9 is a plan view of the 1st bearing.

[0017] Figure 10 is a sectional view along Figure 9 the IV-IV line.

[0018] Figure 11 is a plan view of a modification example of the 1st partition plate member.

[0019] Figure 12 is a sectional view along Figure 11 the V-V line.

[0020] Figure 13 is a plan view of a modification example of the 2nd partition plate member.

[0021] Figure 14 is a sectional view along Figure 13 the VI-VI line.

[0022] Figure 15 is a sectional view of a modification example of the partition plate. DETAILED DESCRIPTION

[0023] Hereinafter, a multi-stage rotary compressor and a refrigeration cycle device according to an embodiment will be described with reference to the drawings.

[0024] Figure 1 is a schematic configuration view of a refrigeration cycle device according to the embodiment. Figure 1 includes a sectional view of the multi-stage rotary compressor according to the 1st embodiment. Figure 2 is a sectional view along Figure 1 the I-I line. Figure 3 is a sectional view along Figure 2 the III-III line. Figure 4 is a sectional view along Figure 1 the II-II line.

[0025] As shown in Figure 1 , a refrigeration cycle device 1 according to the embodiment has a multi-stage rotary compressor 2, a radiator 3, an expansion device (expansion valve) 4, and an evaporator (heat sink) 5.

[0026] The multi-stage rotary compressor 2 has a compressor main body 11 and a liquid accumulator (gas-liquid separator) 12. The multi-stage rotary compressor 2 compresses a gas refrigerant as a working fluid.

[0027] The radiator 3 is connected to the discharge portion 15 of the compressor main body 11. The radiator 3 cools the high-temperature, high-pressure gas refrigerant discharged from the compressor main body 11. The radiator 3 radiates the high-temperature, high-pressure gas refrigerant.

[0028] The expansion device 4 is connected to the downstream side of the radiator 3. The expansion device 4 depressurizes the refrigerant. The expansion device 4 reduces the pressure of the high-pressure refrigerant sent from the radiator 3 to become a low-temperature, low-pressure liquid refrigerant.

[0029] The evaporator 5 is connected between the expansion device 4 and the introduction portion 12a of the accumulator 12. The evaporator 5 evaporates the refrigerant. The evaporator 5 vaporizes the low-temperature, low-pressure liquid refrigerant sent from the expansion device 4 to become a low-pressure gas refrigerant. The evaporator 5 cools the surroundings by taking heat of vaporization from the surroundings when the low-pressure liquid refrigerant vaporizes. The low-pressure gas refrigerant after passing through the evaporator 5 is taken into the multi-stage rotary compressor 2.

[0030] The symbol 13 in the drawing indicates an introduction passage that extends from the discharge portion 15 of the compressor main body 11 to the introduction portion 12a of the accumulator 12.

[0031] The discharge portion 12b of the accumulator 12 is connected to the low-stage suction portion 14 of the compressor main body 11 by the low-stage suction pipe 6. The gas refrigerant after gas-liquid separation in the accumulator 12 is guided by the low-stage suction pipe 6. The gas refrigerant is guided to the low-stage compression mechanism portion 37 of the compressor main body 11. The gas refrigerant is compressed to an intermediate pressure by the low-stage compression mechanism portion 37 of the compressor main body 11.

[0032] The refrigeration cycle device 1 has an intermediate pressure passage 7. The intermediate pressure passage 7 guides the gas refrigerant at an intermediate pressure to an intermediate cooler 7a. The intermediate pressure passage 7 guides the gas refrigerant at an intermediate pressure to the high-stage compression mechanism portion 38 of the compressor main body 11. The intermediate pressure passage 7 extends from the low-stage discharge portion 24 that communicates with the low-stage compression mechanism portion 37. The intermediate pressure passage 7 extends to the high-stage suction portion 26 that communicates with the high-stage compression mechanism portion 38.

[0033] The refrigeration cycle device 1 has a second accumulator (gas-liquid separator) 8 and a second expansion device (expansion valve) 9 between the expansion device 4 and the evaporator 5. A bypass passage 8a is provided between the second accumulator 8 and the high-stage suction portion 26 of the compressor main body 11. The bypass passage 8a is connected to the middle of the intermediate pressure passage 7. The gas refrigerant after gas-liquid separation in the second accumulator 8 passes through the bypass passage 8a and merges with the gas refrigerant passing through the intermediate pressure passage 7, and is guided to the high-stage suction portion 26.

[0034] The pressure of the gas refrigerant that is gas-liquid separated in the second accumulator 8 is equal to the intermediate pressure of the gas refrigerant that is compressed by the low-stage compression mechanism section 37 of the compressor main body 11.

[0035] The refrigerant as a working fluid circulates in the refrigeration cycle device 1 while changing phase into a gas refrigerant (gaseous refrigerant) and a liquid refrigerant. The refrigerant absorbs heat in the process of changing phase from the liquid refrigerant into the gas refrigerant. The refrigeration, refrigeration, and the like are performed using the heat absorption. For example, as the refrigerant, an HFC-based refrigerant, an HFO-based refrigerant, a natural refrigerant, or the like can be used. As the HFC-based refrigerant, R410A, R32, or the like is used. As the HFO-based refrigerant, R1234yf, R1234ze, or the like is used. As the natural refrigerant, CO2 or the like is used.

[0036] The accumulator 12 is a so-called gas-liquid separator. The accumulator 12 is provided between the evaporator 5 and the compressor main body 11. The accumulator 12 is connected to the compressor main body 11 by the low-stage suction pipe 6. The accumulator 12 separates the gas refrigerant that is vaporized in the evaporator 5 from the liquid refrigerant that is not vaporized in the evaporator 5. The accumulator 12 supplies only the separated gas refrigerant to the compressor main body 11.

[0037] (First Embodiment)

[0038] The multistage rotary compressor 2 of the first embodiment will be described.

[0039] The multistage rotary compressor 2 is a so-called rotary compressor. The multistage rotary compressor 2 compresses the low-pressure gas refrigerant taken into the inside in two stages to become a high-temperature, high-pressure gas refrigerant.

[0040] The compressor main body 11 has a hermetic case 34, a rotary shaft 31, an electric motor (driving member) 32, a low-stage suction pipe 6, a compression member 33, a low-stage discharge pipe 25, a high-stage suction pipe 27, and a pair of bearings 41, 42.

[0041] The hermetic case 34 houses the rotary shaft 31, the electric motor (driving member) 32, the compression member 33, and the pair of bearings 41, 42. The hermetic case 34 is an example of a "case".

[0042] The compressor main body 11 is arranged so that the axial directions of the rotary shaft 31 and the hermetic case 34 become the up-down direction. The rotary shaft 31 has a central axis C. The central axis C coincides with the central axis of the hermetic case 34. The direction along the central axes C of the rotary shaft 31 and the hermetic case 34 is the "axial direction". The direction that passes through the central axis C and is orthogonal to the axial direction is the "radial direction". The direction around the central axis C is the "circumferential direction".

[0043] The closed housing 34 is a closed container in which both end portions of a cylindrical body are closed. The electric motor 32 is housed in the upper portion of the closed housing 34. The compression means 33 is housed in the lower portion of the closed housing 34. The electric motor 32 and the compression means 33 are coupled via the rotary shaft 31. In the closed housing 34, the electric motor 32 is provided in the portion on the one end side of the rotary shaft 31. The compression means 33 is provided in the portion on the other end side of the rotary shaft 31. In the closed housing 34, the frame 34a is provided between the electric motor 32 and the compression means 33. The frame 34a is formed in a ring shape coaxial with the closed housing 34. The frame 34a is fixed to the inner wall surface of the closed housing 34.

[0044] The lubricating oil J is accumulated in the bottom portion of the closed housing 34. The bottom portion of the closed housing 34 constitutes a lubricating oil accumulation portion 34b in which the lubricating oil J is accumulated. A portion of the compression means 33 is immersed in the lubricating oil J. The high-pressure gas refrigerant compressed by the high-stage compression mechanism portion 38 is discharged to the space in the closed housing 34.

[0045] The electric motor 32 is a so-called inner rotor type DC brushless motor. The electric motor 32 is an electric motor provided with a stator 35 and a rotor 36. The stator 35 is fixed to the inner wall surface of the upper portion of the closed housing 34. The rotor 36 is disposed inside the stator 35 in a state of being spaced apart in the radial direction. The rotor 36 is fixed to the upper portion of the rotary shaft 31.

[0046] The compression means 33 is a multi-cylinder compression means having a plurality of cylinder bodies 37a, 38a. For example, the compression means 33 is a two-cylinder (multi-cylinder) compression means. The compression means 33 has a pair (plurality) of cylinder bodies 37a, 38a arranged in the vertical direction (axial direction). The compression means 33 is provided with a low-stage compression mechanism portion 37, a high-stage compression mechanism portion 38, and a partition plate 39.

[0047] The low-stage compression mechanism portion 37 is located on the upper side in the axial direction. The high-stage compression mechanism portion 38 is located on the lower side in the axial direction. The partition plate 39 separates the low-stage compression mechanism portion 37 and the high-stage compression mechanism portion 38 in the vertical direction (axial direction).

[0048] The low-stage compression mechanism portion 37 sucks in low-pressure working fluid from the reservoir 12. The above-described "low pressure" means relatively low pressure with respect to the "intermediate pressure" and the "high pressure" described later. The low-stage compression mechanism portion 37 compresses (steps up) the low-pressure working fluid sucked in from the reservoir 12 to "intermediate pressure" which is relatively high. The high-stage compression mechanism portion 38 compresses (steps up) the working fluid of "intermediate pressure" compressed by the low-stage compression mechanism portion 37 to "high pressure" which is relatively high.

[0049] The low-stage compression mechanism section 37 has a low-stage side cylinder block 37a. The axial direction of the low-stage side cylinder block 37a is parallel to the axial direction of the rotation shaft 31. The rotation shaft 31 penetrates the low-stage side cylinder block 37a in the up-and-down direction. The low-stage side cylinder block 37a has a circular low-stage side cylinder block hole 37b. The central axis of the low-stage side cylinder block hole 37b coincides with the rotation central axis C of the rotation shaft 31.

[0050] The high-stage compression mechanism section 38 has a high-stage side cylinder block 38a. The axial direction of the high-stage side cylinder block 38a is parallel to the axial direction of the rotation shaft 31. The rotation shaft 31 penetrates the high-stage side cylinder block 38a in the up-and-down direction. The high-stage side cylinder block 38a has a circular high-stage side cylinder block hole 38b. The central axis of the high-stage side cylinder block hole 38b coincides with the rotation central axis C of the rotation shaft 31. The high-stage side cylinder block hole 38b is arranged coaxially with the low-stage side cylinder block hole 37b. The high-stage side cylinder block hole 38b and the low-stage side cylinder block hole 37b are arranged coaxially with the rotation shaft 31.

[0051] The low-stage side cylinder block 37a is an example of a "connected member". In the present embodiment, the connected member is the low-stage side cylinder block 37a, but the connected member can also be the high-stage side cylinder block 38a. That is, the connected member can be either one of the low-stage side cylinder block 37a and the high-stage side cylinder block 38a.

[0052] The outer peripheral portion of the low-stage side cylinder block 37a is fixed to the frame 34a in a state of abutting against the lower surface of the frame 34a. The outer peripheral portion of the low-stage side cylinder block 37a is fastened and fixed to the frame 34a by the bolt B1 inserted from below.

[0053] The upper end opening of the low-stage side cylinder block hole 37b of the low-stage side cylinder block 37a is closed by the 1st bearing 41. The lower end opening of the low-stage side cylinder block hole 37b of the low-stage side cylinder block 37a is closed by the partition plate 39. The space partitioned by the low-stage side cylinder block 37a, the 1st bearing 41, and the partition plate 39 is the low-stage side cylinder chamber 37c.

[0054] The upper end opening of the high-stage side cylinder block hole 38b of the high-stage side cylinder block 38a is sealed by the partition plate 39. The lower end opening of the high-stage side cylinder block hole 38b of the high-stage side cylinder block 38a is sealed by the 2nd bearing 42. The space partitioned by the high-stage side cylinder block 38a, the 2nd bearing 42, and the partition plate 39 is the high-stage side cylinder chamber 38c.

[0055] The low-stage side cylinder block 37a and the high-stage side cylinder block 38a are in contact with each other in the axial direction via the partition plate 39. The detailed configuration of the partition plate 39 will be described later.

[0056] The rotation shaft 31 has a low-stage eccentric portion 31b at a portion located inside the low-stage cylinder chamber 37c. The low-stage eccentric portion 31b is eccentric to the radial direction side with respect to the center axis C. The rotation shaft 31 has a high-stage eccentric portion 31d at a portion located inside the high-stage cylinder chamber 38c. The high-stage eccentric portion 31d is eccentric to the other radial direction side with respect to the center axis C.

[0057] The rotation shaft 31 has a main shaft that is centered on the center axis C. The main shaft includes a first main shaft 31a, a second main shaft 31c, and a third main shaft 31e. The first main shaft 31a extends upward from the low-stage eccentric portion 31b. The second main shaft 31c is between the low-stage eccentric portion 31b and the high-stage eccentric portion 31d. The third main shaft 31e extends downward from the high-stage eccentric portion 31d. The rotor 36 of the electric motor 32 is fixed to the first main shaft 31a.

[0058] The eccentric portions 31b, 31d are formed in a cylindrical shape with the same diameter. The eccentric portions 31b, 31d are arranged with a phase difference of 180° in the circumferential direction.

[0059] The low-stage roller 45, which is in a cylindrical shape, is rotatably fitted to the low-stage eccentric portion 31b. The low-stage roller 45 rotates around the center axis of the low-stage eccentric portion 31b (see FIG. 2). Figure 2 ).

[0060] The high-stage roller 46, which is in a cylindrical shape, is rotatably fitted to the high-stage eccentric portion 31d. The high-stage roller 46 rotates around the center axis of the high-stage eccentric portion 31d (see FIG. 2). Figure 4 ).

[0061] The first bearing 41 is on the upper side of the low-stage cylinder block 37a (on the opposite side in the axial direction from the partition plate 39). The first bearing 41 is arranged on the inner peripheral side of the frame 34a.

[0062] The first bearing 41 has a cylindrical shaft portion 41a and a flange portion 41b. The shaft portion 41a rotatably supports the first main shaft 31a of the rotation shaft 31. The flange portion 41b is formed by expanding the outer peripheral side of the lower end portion of the shaft portion 41a. The flange portion 41b closes the upper end opening of the low-stage cylinder block hole 37b.

[0063] The second bearing 42 is on the lower side of the high-stage cylinder block 38a (on the opposite side in the axial direction from the partition plate 39).

[0064] The second bearing 42 has a cylindrical shaft portion 42a and a flange portion 42b. The shaft portion 42a rotatably supports the third main shaft 31e of the rotation shaft 31. The flange portion 42b is formed by expanding the outer peripheral side of the upper end portion of the shaft portion 42a. The flange portion 42b closes the lower end opening of the high-stage cylinder block hole 38b.

[0065] The first bearing 41 is secured to the lower-level side cylinder 37a by a plurality of bolts B2 inserted from above. The bolts B2 extend downward through the lower-level side cylinder 37a. The bolts B2 also pass through the partition plate 39 and the upper-level side cylinder 38a. The bolts B2 are screwed into the threaded holes of the second bearing 42. The first bearing 41, the lower-level side cylinder 37a, the partition plate 39, the upper-level side cylinder 38a, and the second bearing 42 are integrally fixed in a stacked manner. This stacked assembly of the first bearing 41, the lower-level side cylinder 37a, the partition plate 39, the upper-level side cylinder 38a, and the second bearing 42 is fixed to the frame 34a.

[0066] The rotating shaft 31 is supported by the first bearing 41 and the second bearing 42 to enable it to rotate. The first bearing 41 and the second bearing 42 are fixed to the sealed housing 34 via the frame 34a.

[0067] A first muffler 43 is fixed to the first bearing 41 by bolt B2. A second muffler 44 is fixed to the second bearing 42.

[0068] like Figure 2 As shown, the low-stage compression mechanism 37 includes blades (low-stage side blades) 18. The blades 18 divide the low-stage side cylinder chamber 37c into an intake chamber 16A and a compression chamber 17A. The intake chamber 16A is the low-stage side intake chamber. The compression chamber 17A is the low-stage side compression chamber.

[0069] The blade 18 is held in the blade groove 18c formed in the lower side cylinder 37a. The blade 18 is capable of moving forward and backward relative to the cylinder chamber 37c. The blade 18 causes the front end face (roller contact surface) 18a on the roller 45 side to abut against the outer peripheral surface of the roller 45. The blade 18 maintains the state in which the front end face 18a abuts against the outer peripheral surface of the roller 45.

[0070] The blade 18 is subjected to force toward the roller 45. The roller 45 rotates eccentrically, thereby causing the blade 18 to move forward and backward in the radial direction.

[0071] A primary intake hole 37d is formed in a portion of the circumferential direction of the primary side cylinder 37a. The primary intake hole 37d penetrates the primary side cylinder 37a radially. The primary intake hole 37d is formed in the eccentric rotation direction of the roller 45 (arrow F direction, which is also the rotation direction of the rotation shaft 31) at a position downstream of the blade groove 18c.

[0072] One end of the lower-stage suction port 37d reaches the outer peripheral surface of the lower-stage side cylinder 37a. The lower-stage suction port 37d opens on the outer peripheral surface of the lower-stage side cylinder 37a. This opening is referred to as the outer opening of the lower-stage suction port 37d. A lower-stage suction pipe 6 extending from the reservoir 12 is connected to the lower-stage suction port 37d. The lower-stage suction pipe 6 is inserted into the lower-stage suction port 37d through the outer opening.

[0073] The other end of the low-level suction hole 37d reaches the inner peripheral surface of the low-level side cylinder chamber 37c. The low-level suction hole 37d is opened on the inner peripheral surface of the low-level side cylinder chamber 37c.

[0074] The low-level discharge hole 37e is formed in another portion of the low-level side cylinder 37a in the circumferential direction. The low-level discharge hole 37e is formed along the radial direction of the low-level side cylinder 37a. For example, the low-level discharge hole 37e is formed in a position rotationally symmetrical to the low-level suction hole 37d in the eccentric rotation direction of the roller 45.

[0075] One end of the low-level discharge hole 37e reaches the outer peripheral surface of the low-level side cylinder 37a. The low-level discharge hole 37e is opened on the outer peripheral surface of the low-level side cylinder 37a. This opening is referred to as the outer opening of the low-level discharge hole 37e. The low-level discharge pipe 25 is connected to the low-level discharge hole 37e. The low-level discharge pipe 25 is inserted into the low-level discharge hole 37e from the outer opening.

[0076] The other end (the end portion on the radially inner side) of the low-level discharge hole 37e reaches the communication hole 37g.

[0077] The high-level suction hole 37f is formed in still another portion of the low-level side cylinder 37a in the circumferential direction. The high-level suction hole 37f is formed along the radial direction of the low-level side cylinder 37a. The high-level suction hole 37f is opened on the outer peripheral surface of the low-level side cylinder 37a. This opening is referred to as the outer opening of the high-level suction hole 37f. The high-level suction pipe 27 is connected to the high-level suction hole 37f. The high-level suction pipe 27 is inserted into the high-level suction hole 37f from the outer opening.

[0078] The other end (the end portion on the radially inner side) of the high-level suction hole 37f reaches the communication hole 37h.

[0079] The low-level suction pipe 6, the low-level discharge pipe 25, and the high-level suction pipe 27 are commonly connected to the low-level side cylinder 37a. That is, the low-level suction pipe 6, the low-level discharge pipe 25, and the high-level suction pipe 27 are connected to the same connected member, that is, the low-level side cylinder 37a. The low-level suction pipe 6, the low-level discharge pipe 25, and the high-level suction pipe 27 can also be connected to the low-level side cylinder 37a at the same height position.

[0080] The angle of the low-level suction pipe 6 with respect to the vane 18 is set as "θ1" when viewed from a direction parallel to the central axis C of the rotation shaft 31. The angle θ1 is the angle of the rotation direction F of the roller 45 (counterclockwise direction) Figure 2 The angle θ1 is the angle of the first direction line L2 with respect to the reference line L1. The reference line L1 is a line passing through the central axis C and the leading end of the vane 18. The first direction line L2 is a line passing through the central axis C and the leading end of the low-level suction pipe 6 (or the end portion on the inner side of the low-level suction hole 37d).

[0081] Viewed from a direction parallel to the central axis C of the rotation axis 31, the angle of the advanced suction tube 27 relative to the blade 18 is defined as "θ2". Angle θ2 is the angle of the rotation direction F. Angle θ2 is the angle of the second direction line L3 relative to the reference line L1. The second direction line L3 is a line passing through the central axis C and the front end of the advanced suction tube 27 (or the end inside the advanced suction port 37f).

[0082] The angle θ2 of the advanced suction pipe 27 relative to the blade 18 is greater than the angle θ1 of the low-level suction pipe 6 relative to the blade 18. Therefore, the compression chamber 17B (refer to) at the start of compression of the advanced compression mechanism 38 can be... Figure 4 The volume of the compression chamber 17A at the start of compression in the lower compression mechanism 37 is smaller than that in the lower compression mechanism 37. Therefore, it is possible to increase the degree of design freedom.

[0083] If the compression ratios of the lower compression mechanism section 37 and the higher compression mechanism section 38 are the same, then the differential pressure before and after compression in the higher compression mechanism section 38 is larger than that in the lower compression mechanism section 37. Therefore, the differential pressure before and after compression in the higher compression mechanism section 38 is more likely to increase.

[0084] As described above, when angle θ2 is greater than angle θ1, the compression start in the advanced compression section 38 can be delayed compared to the compression start in the low-stage compression section 37. Therefore, the time from the start to the end of compression in the advanced compression section 38 can be shortened. Consequently, even if gaseous refrigerant leakage occurs in cylinder chambers 37c and 38c, the leakage time in the high-pressure advanced side cylinder chamber 38c can be shortened. Therefore, a multi-stage rotary compressor 2 with less leakage and high efficiency can be provided.

[0085] like Figure 1 As shown, the partition plate 39 is formed in a ring shape centered on axis C. The partition plate 39 is axially divided into multiple (in this embodiment, a pair of upper and lower partition plate components 39a and 39b). The partition plate components 39a and 39b are formed in a ring shape. Recesses are formed on the facing surfaces of the partition plate components 39a and 39b respectively. The partition plate components 39a and 39b are interconnected. An intermediate pressure space (intermediate pressure chamber) 39c is formed inside the partition plate 39 through the aforementioned recesses. Because the partition plate 39 is divided into a pair of partition plate components 39a and 39b, the intermediate pressure space 39c is easily formed.

[0086] The partition plate 39 has sufficient volume in the intermediate pressure space 39c, thus suppressing discharge pulsations of gaseous refrigerant discharged from the lower-stage compression unit 37. The partition plate 39 also has sufficient volume in the intermediate pressure space 39c, thus suppressing intake pulsations of gaseous refrigerant drawn into the higher-stage compression unit 38.

[0087] An introduction hole (omitted from illustration) that guides gas refrigerant from the low-stage side cylinder chamber 37c to the intermediate pressure space 39c is formed in the partition plate member 39a. An exit hole 39d that guides gas refrigerant from the intermediate pressure space 39c to the communication hole 37g (refer to Figure 2 ) is formed in the partition plate member 39a.

[0088] An exhaust valve device can also be provided on the end surface of the low-stage compression mechanism portion 37 side of the partition plate 39. The exhaust valve device is capable of exhausting intermediate pressure gas refrigerant after compression by the low-stage compression mechanism portion 37 into the intermediate pressure space 39c.

[0089] As shown in Figure 3 , a first exit path 51 is formed in the partition plate 39. The first exit path 51 is formed through the partition plate 39 from one face to the other face of the partition plate 39. The first exit path 51 is capable of guiding gas refrigerant from the communication hole 37h (refer to Figure 2 ) to the high-stage compression mechanism portion 38.

[0090] As shown in Figure 4 , the high-stage compression mechanism portion 38 is provided with a vane (high-stage side vane) 21. The vane 21 divides the cylinder chamber 38c into a suction chamber 16B and a compression chamber 17B. The suction chamber 16B is a high-stage side suction chamber. The compression chamber 17B is a high-stage side compression chamber.

[0091] The vane 21 is held in a vane groove 21c formed in the high-stage side cylinder block 38a. The vane 21 is capable of moving in and out with respect to the cylinder chamber 38c. The vane 21 abuts the outer peripheral surface of the roller 46 with a front end surface (roller abutting surface) 21a of the roller 46 side. The vane 21 maintains the state of abutting the front end surface 21a with the outer peripheral surface of the roller 46.

[0092] The vane 21 is urged toward the roller 46. The vane 21 moves in and out in the radial direction by eccentric rotation of the roller 46.

[0093] A second exit path 52 that communicates with the first exit path 51 (refer to Figure 3 ) is formed in the inner peripheral surface of the high-stage side cylinder block 38a.

[0094] A communication path 28 is formed by a recess in the inner peripheral surface of the high-stage side cylinder block 38a. The circumferential position of the communication path 28 is between the vane 21 and the second exit path 52. The communication path 28 is, for example, a circular arc-shaped recess. The communication path 28 communicates with the second exit path 52.

[0095] As shown in Figure 1 , a communication path 29 is formed by a recess in the lower surface of the partition plate member 39b. The circumferential position of the communication path 29 is between the vane 21 and the second exit path 52. The communication path 29 is, for example, a circular arc-shaped recess. The communication path 29 communicates with the first exit path 51 (refer toFigure 3 ) communicate.

[0096] In the present embodiment, the communication passage 28 and the communication passage 29 are formed on both the high-stage cylinder block 38a and the partition plate 39, but the communication passages can be formed on only one of the high-stage cylinder block 38a and the partition plate 39.

[0097] The low-stage compression mechanism portion 37 and the high-stage compression mechanism portion 38 are preferably such that the axial dimension (height) of the cylinder block 37a, 38a, the inner diameter of the cylinder chamber 37c, 38c, and the eccentric amount of the eccentric portion 31b, 31d are equal to each other. Thereby, commonalization of parts between the low-stage cylinder block 37a and the high-stage cylinder block 38a can be achieved. Therefore, manufacturing costs can be suppressed.

[0098] At the start of the multi-stage rotary compressor 2, electric power is supplied to the stator 35 of the electric motor 32. When electric power is supplied to the stator 35, the rotating shaft 31 rotates around the axis line C together with the rotor 36. When the rotating shaft 31 rotates, the eccentric portions 31b, 31d of the compression mechanism portions 37, 38 and the rollers 45, 46 eccentrically rotate within the cylinder chambers 37c, 38c.

[0099] As shown in Figs. 1 and 2, the compression mechanism portions 37, 38 function as follows by the eccentric rotation of the rollers 45, 46. Each of the compression mechanism portions 37, 38 performs a suction operation of sucking gas refrigerant into the suction chamber 16A, 16B and a compression operation of compressing the gas refrigerant in the compression chamber 17A, 17B. Figure 2 Figure 4 As shown in Figs. 1 and 2, the compression mechanism portions 37, 38 function as follows by the eccentric rotation of the rollers 45, 46. Each of the compression mechanism portions 37, 38 performs a suction operation of sucking gas refrigerant into the suction chamber 16A, 16B and a compression operation of compressing the gas refrigerant in the compression chamber 17A, 17B.

[0100] As shown in Figs. 1 and 2, by the suction operation of the low-stage compression mechanism portion 37, low-pressure gas refrigerant is sucked into the hermetic case 34 from the low-stage suction portion 14 through the low-stage suction pipe 6. The gas refrigerant is introduced into the low-stage suction hole 37d (refer to Fig. 3). In the low-stage compression mechanism portion 37, the sucked gas refrigerant is compressed by the above-described compression operation to be boosted to an intermediate pressure. The gas refrigerant boosted by the low-stage compression mechanism portion 37 is discharged into the intermediate pressure space 39c of the partition plate 39. Figure 1 Figure 2 As shown in Figs. 1 and 2, by the suction operation of the low-stage compression mechanism portion 37, low-pressure gas refrigerant is sucked into the hermetic case 34 from the low-stage suction portion 14 through the low-stage suction pipe 6. The gas refrigerant is introduced into the low-stage suction hole 37d (refer to Fig. 3). In the low-stage compression mechanism portion 37, the sucked gas refrigerant is compressed by the above-described compression operation to be boosted to an intermediate pressure. The gas refrigerant boosted by the low-stage compression mechanism portion 37 is discharged into the intermediate pressure space 39c of the partition plate 39.

[0101] The gas refrigerant in the intermediate pressure space 39c is introduced into the low-stage discharge hole 37e through the discharge hole 39d and the communication hole 37g (refer to Fig. 3). The gas refrigerant is discharged from the low-stage discharge portion 24 to the outside of the hermetic case 34. The gas refrigerant is discharged through the low-stage discharge pipe 25 and guided by the intermediate pressure passage 7. The gas refrigerant is cooled by the intermediate cooler 7a midway through the intermediate pressure passage 7. The gas refrigerant is guided to the high-stage suction portion 26 through the intermediate pressure passage 7. Figure 2

[0102] ​​​The intermediate-pressure gaseous refrigerant after gas-liquid separation in the second reservoir 8 is guided to the advanced suction section 26 via bypass passage 8a. The bypass passage 8a is connected midway to the intermediate-pressure passage 7. The gaseous refrigerant in the bypass passage 8a merges with the gaseous refrigerant in the intermediate-pressure passage 7.

[0103] like Figure 3 As shown, through the suction action of the advanced compression mechanism 38, intermediate-pressure gaseous refrigerant is drawn from the advanced suction section 26 into the sealed housing 34. The gaseous refrigerant is introduced into the advanced suction port 37f through the advanced suction pipe 27. The gaseous refrigerant is introduced into the advanced compression mechanism 38 through the connecting port 37h and through the first outlet path 51 and the second outlet path 52.

[0104] In the advanced compression unit 38, the intake gaseous refrigerant is further compressed and pressurized to a high pressure. The pressurized gaseous refrigerant by the advanced compression unit 38 is discharged to the outside of the cylinder chamber 38c (inside the sealed housing 34).

[0105] The high-pressure gaseous refrigerant discharged into the sealed housing 34 circulates in the radiator 3, expansion device 4, evaporator 5, etc., returning to the low-pressure gaseous refrigerant. The returned low-pressure gaseous refrigerant is then guided back into the cylinder chamber 37c of the low-stage compression mechanism 37, and the above process is repeated.

[0106] In the multi-stage rotary compressor 2 of this embodiment, the low-stage suction pipe 6, the low-stage discharge pipe 25, and the high-stage suction pipe 27 are connected to the same connected component, namely the low-stage side cylinder 37a. Therefore, compared to the case where pipes 6, 25, and 27 are connected to different connected components, the positional accuracy of pipes 6, 25, and 27 can be improved. This suppresses positional misalignment of pipes 6, 25, and 27 relative to the sealed housing 34. Thus, a high-quality multi-stage rotary compressor 2 with high positional accuracy of its constituent components can be provided. The multi-stage rotary compressor 2 improves the positional accuracy of pipes 6, 25, and 27, and therefore also exhibits superior manufacturability.

[0107] The multi-stage rotary compressor 2 ensures that the positions of pipes 6, 25, and 27 remain unchanged even when the axial dimensions of the compression components 33 are altered. Therefore, design changes such as those to the insertion holes (holes through which pipes 6, 25, and 27) formed in the sealed housing 34 can be reduced. Consequently, it is easy to accommodate specification changes. For example, it is easy to implement variations in discharge volume.

[0108] The lower-stage side cylinder 37a, as the connected component, is fixed to the sealed housing 34 via a frame 34a, thus stably supporting the tubes 6, 25, and 27. Therefore, the mechanical strength of the multi-stage rotary compressor 2 can be improved.

[0109] The low-stage suction pipe 6, the low-stage discharge pipe 25, and the high-stage suction pipe 27 are centrally connected to a common connecting component, thus providing stable support for these pipes 6, 25, and 27. Therefore, the mechanical strength of the multi-stage rotary compressor 2 can be improved.

[0110] When the connected component is either the low-stage side cylinder 37a or the high-stage side cylinder 38a, the low-stage suction pipe 6, the low-stage discharge pipe 25, and the high-stage suction pipe 27 can be positioned close to the cylinder block. Therefore, the refrigerant flow path can be shortened. Consequently, the device configuration can be simplified, and the overall size can be reduced.

[0111] In the multi-stage rotary compressor 2 of this embodiment, the connected component is the low-stage side cylinder 37a. Therefore, the distance from the low-stage suction pipe 6 to the low-stage side cylinder chamber 37c can be shorter than the distance from the high-stage suction pipe 27 to the high-stage side cylinder chamber 38c. Compared to the high-stage side, the low-stage side has a higher refrigerant flow rate, thus making it prone to pressure loss. The multi-stage rotary compressor 2 has a shorter distance from the low-stage suction pipe 6 to the low-stage side cylinder chamber 37c, thus suppressing the suction loss on the low-stage side, which is prone to pressure loss.

[0112] Compared to the high-stage side cylinder block 38a, the low-stage side cylinder block 37a operates at a lower temperature. Because the connected component is the low-stage side cylinder block 37a, the heating of the refrigerant in the low-stage compression section 37 can be suppressed in the multi-stage rotary compressor 2. Therefore, compression efficiency can be improved. Thus, a high-efficiency multi-stage rotary compressor 2 can be provided.

[0113] like Figure 4 As shown, when connecting passages 28 and 29 are formed on the advanced side cylinder 38a and the partition plate 39, gaseous refrigerant can flow into connecting passages 28 and 29 from the outlet passages 51 and 52. Therefore, when the volume of the suction chamber 16B increases as the advanced side roller 46 passes through the blade 21 to reach the second outlet passage 52, gaseous refrigerant flows into the suction chamber 16B. Therefore, the energy required for the volume of the suction chamber 16B to increase can be suppressed.

[0114] In this embodiment, a connecting passage 28 is formed on the advanced side cylinder block 38a. A connecting passage 29 is formed on the partition plate 39. In the multi-stage rotary compressor 2, the connecting passage 29 may be formed only on the advanced side cylinder block 38a and the partition plate 39. According to this configuration, since there is no connecting passage on the advanced side cylinder block 38a, the forming accuracy of the advanced side cylinder chamber 38c can be improved. Furthermore, since there is no connecting passage on the advanced side cylinder block 38a, manufacturability can be improved.

[0115] Modifications of the low-level compression mechanism section 37 and the high-level compression mechanism section 38 will be described.

[0116] Figure 5 is a configuration view of a modification example of the low-stage compression mechanism section 37. Figure 6 is a configuration view of a modification example of the high-stage compression mechanism section 38.

[0117] As shown in Figure 5 , in the low-stage compression mechanism section 37, the low-stage side cylinder chamber 37c can also be formed eccentrically with respect to the center axis C.

[0118] The eccentric direction of the low-stage side cylinder chamber 37c with the center axis C as a reference will be referred to as "Dl". The eccentric direction Dl is a direction from the center axis C toward the center axis Cl of the low-stage side cylinder chamber 37c.

[0119] The angle of the eccentric direction Dl with respect to the reference line L4, as viewed from a direction parallel to the center axis C, will be referred to as "Θ3". The angle Θ3 is an angle of the direction of rotation F (counterclockwise direction in Figure 5 ) of the roller 45. The reference line L4 is a line passing through the center axis C and the front end of the vane 18.

[0120] As shown in Figure 6 , in the high-stage compression mechanism section 38, the high-stage side cylinder chamber 38c can also be formed eccentrically with respect to the center axis C. The high-stage side cylinder chamber 38c is eccentric in a direction approaching the second discharge passage 52.

[0121] The eccentric direction of the high-stage side cylinder chamber 38c with the center axis C as a reference will be referred to as "D2". The eccentric direction D2 is a direction from the center axis C toward the center axis C2 of the high-stage side cylinder chamber 38c.

[0122] The angle of the eccentric direction D2 with respect to the reference line L5, as viewed from a direction parallel to the center axis C, will be referred to as "Θ4". The angle Θ4 is an angle of the direction of rotation F (counterclockwise direction in Figure 6 ) of the roller 46. The reference line L5 is a line passing through the center axis C and the front end of the vane 21.

[0123] As shown in Figure 5 and Figure 6 , the angle Θ4 is larger than the angle Θ3. Generally, the gap between the cylinder bore inner peripheral surface on the side opposite the eccentric direction and the roller outer peripheral surface becomes smaller. When the portion where the gap becomes smaller is at a position at which the compression process has progressed by about 2 / 3, it is possible to reduce leakage from the compression chamber to the suction chamber.

[0124] In the compression mechanism sections 37, 38, the second discharge passage 52 is at a position on the downstream side in the direction of rotation F from the low-stage suction hole 37d, and thus the compression in the high-stage compression mechanism section 38 is delayed compared to the compression in the low-stage compression mechanism section 37.

[0125] Since the angle θ4 is larger than the angle θ3, it is possible to position the portion in which the intermediate gap in the high-stage compression mechanism portion 38 is made small at a position that is located on the downstream side in the rotation direction F from the portion in which the intermediate gap in the low-stage compression mechanism portion 37 is made small. Therefore, in the high-stage compression mechanism portion 38, it is possible to appropriately position the portion in which the intermediate gap is made small, and it is possible to reduce the leakage from the compression chamber to the suction chamber.

[0126] The refrigeration cycle device 1 of the present embodiment is provided with the above-described multistage rotary compressor 2, and thus it is possible to provide a high-quality refrigeration cycle device 1 in which the positional accuracy of the constituent components is high.

[0127] (Second Embodiment)

[0128] The multistage rotary compressor of the second embodiment will be described. The same components as those of the multistage rotary compressor of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0129] Figure 7 is a sectional view of the multistage rotary compressor 102 of the second embodiment. Figure 8 is a plan view of the multistage rotary compressor 102.

[0130] As shown in Figure 7 and Figure 8 , the multistage rotary compressor 102 is provided with a compressor main body 111 and a reservoir 12 (see Figure 1 . The illustration thereof is omitted in Figure 7 and Figure 8 ).

[0131] The compressor main body 111 is provided with a hermetic case 34, a rotary shaft 31, an electric motor (driving means) 32, a low-stage suction pipe 6, a compression means 33, a low-stage discharge pipe 25, a high-stage suction pipe 27, and a pair of bearings 41, 42.

[0132] Figure 9 is a plan view of the first bearing 41. Figure 10 is a sectional view along the IV-IV line of Figure 9 .

[0133] As shown in Figure 9 and Figure 10 , the first bearing 41 is provided with a cylindrical cylinder portion 41a and a flange portion 41b. The cylinder portion 41a rotatably supports the rotary shaft 31. The flange portion 41b is formed by expanding the outer periphery of the lower end portion of the cylinder portion 41a.

[0134] The first bearing 41 is an example of a connecting member.

[0135] A primary suction hole 142 is formed on a circumferential portion of the flange portion 141b. The primary suction hole 142 is formed radially along the flange portion 141b. One end of the primary suction hole 142 opens on the outer circumferential surface of the flange portion 141b. A primary suction tube 6 (see reference) is connected to the primary suction hole 142. Figure 8 The other end of the lower suction port 142 reaches the connecting port 142a.

[0136] A low-level discharge hole 143 is formed on another circumferential portion of the flange portion 141b. The low-level discharge hole 143 is formed radially along the flange portion 141b. For example, the low-level discharge hole 143 is formed circumferentially at a position that is rotationally symmetrical with respect to the low-level intake hole 142.

[0137] One end of the low-level discharge hole 143 reaches the outer peripheral surface of the flange portion 141b. One end of the low-level discharge hole 143 opens on the outer peripheral surface of the flange portion 141b. A low-level discharge pipe 25 (see reference) is connected to the low-level discharge hole 143. Figure 8 The other end of the lower discharge port 143 reaches the connecting port 143a.

[0138] A high-efficiency suction port 144 is formed on another circumferential portion of the flange portion 141b. The high-efficiency suction port 144 is formed radially along the flange portion 141b. One end of the high-efficiency suction port 144 opens on the outer circumferential surface of the flange portion 141b. A high-efficiency suction tube 27 (see reference) is connected to the high-efficiency suction port 144. Figure 8 The other end of the advanced suction port 144 reaches the connecting port 144a.

[0139] The low-level inhalation tube 6, the low-level discharge tube 25, and the high-level inhalation tube 27 are all connected to the flange portion 141b. That is, the low-level inhalation tube 6, the low-level discharge tube 25, and the high-level inhalation tube 27 are connected to the same connected component, namely the flange portion 141b.

[0140] Set the inner diameter of the low-level suction tube 6 to Set the inner diameter of the low-level discharge pipe 25 to Set the inner diameter of the advanced inhalation tube 27 to inner diameter Preferred to be in This relationship allows for increasing the cross-sectional area of ​​the lower-stage suction pipe, which has a larger volumetric flow rate, thereby reducing pressure loss.

[0141] like Figure 7 As shown, low-pressure gaseous refrigerant is introduced into the low-level suction port 142 of the first bearing 141 through the low-level suction pipe 6. The gaseous refrigerant passes through the connecting port 142a (see reference). Figure 9) is introduced into the low-stage compression mechanism section 37. The low-stage compression mechanism section 37 compresses and steps up the gas refrigerant to an intermediate pressure. The gas refrigerant stepped up by the low-stage compression mechanism section 37 is discharged into the intermediate pressure space 39c of the partition plate 39.

[0142] The gas refrigerant in the intermediate pressure space 39c is introduced into the low-stage discharge hole 143 of the 1st bearing 141 via the communication hole 143a (refer to Figure 9 ). The gas refrigerant is discharged to the outside of the hermetic case 34 via the low-stage discharge pipe 25. The gas refrigerant is guided to the high-stage suction pipe 27 via the intermediate pressure passage. The gas refrigerant is introduced into the high-stage suction hole 144 of the 1st bearing 141. The gas refrigerant is introduced into the high-stage compression mechanism section 38 via the communication hole 144a (refer to Figure 9 ), the 1st lead-out hole, and the 2nd lead-out hole. The gas refrigerant is stepped up by the high-stage compression mechanism section 38. The stepped-up gas refrigerant is discharged to the outside of the cylinder chamber (inside of the hermetic case 34).

[0143] In the multi-stage rotary compressor 102 of the present embodiment, the low-stage suction pipe 6, the low-stage discharge pipe 25, and the high-stage suction pipe 27 are connected to the same connected member, i.e., the 1st bearing 141. Therefore, compared with the case where the pipes 6, 25, 27 are connected to mutually different connected members, the positional accuracy of the pipes 6, 25, 27 can be improved. Thus, the positional deviation of the pipes 6, 25, 27 with respect to the hermetic case 34 can be suppressed. Therefore, a multi-stage rotary compressor 102 having high positional accuracy of the constituent members and high quality can be provided. The multi-stage rotary compressor 102 can improve the positional accuracy of the pipes 6, 25, 27, and thus is also excellent in terms of manufacturability.

[0144] The multi-stage rotary compressor 102 is such that even if the axial dimension of the parts of the compression element 33 is changed, the positions of the pipes 6, 25, 27 do not change. Therefore, for example, the design change of the insertion hole (hole for insertion of the pipes 6, 25, 27) formed in the hermetic case 34 and the like can be reduced. Thus, the changeover to different specifications can be easily dealt with. For example, the changeover to different discharge volumes and the like can be easily implemented.

[0145] In the present embodiment, the low-stage suction pipe 6, the low-stage discharge pipe 25, and the high-stage suction pipe 27 are connected to the 1st bearing 141, but the low-stage suction pipe 6, the low-stage discharge pipe 25, and the high-stage suction pipe 27 can be connected to the 2nd bearing 42. That is, the connected member can be one of the 1st bearing 141 and the 2nd bearing 42.

[0146] A modification of the partition plate 39 will be described.

[0147] Figure 11 is a plan view of a 1st partition plate member 139a as a modification of the partition plate member.Figure 12 It is along Figure 11 A cross-sectional view of the VV line. Figure 13 This is a top view of the second partition plate component 139b, which is a modified example of a partition plate component. Figure 14 It is along Figure 13 A cross-sectional view of the VI-VI line. Figure 15 This is a cross-sectional view of partition plate 139, which is a modified example of partition plate 39.

[0148] like Figure 11 as well as Figure 12 As shown, on the opposite side of the first partition plate component 139a ( Figure 12 An intermediate pressure space is formed on the upper surface of the middle surface through a recess 139c. For example... Figure 13 as well as Figure 14 As shown, on the opposite side of the second partition plate component 139b ( Figure 14 No recess is formed on the upper surface of the

[0149] like Figure 15 As shown, the first partition plate component 139a and the second partition plate component 139b are configured to form the partition plate 139 by making their opposing surfaces face each other and overlap. The thicker the second partition plate component 139b, the more difficult it is to deform. The second partition plate component 139b is the partition plate component closest to the advanced compression mechanism section 38.

[0150] If the second partition plate component 139b without the recess is positioned toward the advanced compression mechanism section 38, deformation of the partition plate 139 due to gas pressure from the advanced compression mechanism section 38 can be suppressed. Therefore, a multi-stage rotary compressor 102 with high reliability can be provided.

[0151] In this embodiment, the partition plate is formed by stacking two partition plate components 139a and 139b, but the number of partition plate components constituting the partition plate is not particularly limited. The number of partition plate components can be one or more (any number of two or more).

[0152] According to at least one embodiment described above, the low-stage suction pipe 6, the low-stage discharge pipe 25, and the high-stage suction pipe 27 are connected to the same connected component, namely the low-stage side cylinder 37a. Therefore, compared to the case where pipes 6, 25, and 27 are connected to different connected components, the positional accuracy of pipes 6, 25, and 27 can be improved. This suppresses positional misalignment of pipes 6, 25, and 27 relative to the sealed housing 34. Consequently, a high-quality multi-stage rotary compressor 2 with high positional accuracy of its constituent components can be provided. The multi-stage rotary compressor 2 improves the positional accuracy of pipes 6, 25, and 27, thus also exhibiting superior manufacturability.

[0153] Several embodiments of the present application are described, but these embodiments are presented by way of example only and are not intended to limit the scope of the application. These embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the application. These embodiments and their modifications are included within the scope and spirit of the application, and are included within the scope of the application and equivalents thereof recited in the patent claims.

[0154] Explanation of symbols

[0155] 1: refrigeration cycle device; 2, 102: multistage rotary compressor; 3: radiator; 4: expansion device; 5: evaporator; 6: low-stage suction pipe; 18: low-stage side vane; 21: high-stage side vane; 25: low-stage discharge pipe; 27: high-stage suction pipe; 28: communication passage; 29: communication passage; 31: rotary shaft; 32: electric motor (driving member); 34: hermetic casing (casing); 37: low-stage compression mechanism section; 37a: low-stage side cylinder (connected member); 37c: low-stage side cylinder chamber; 38: high-stage compression mechanism section; 38a: high-stage side cylinder; 38c: high-stage side cylinder chamber; 39, 139: partition plate; 139a: first partition plate member; 139b: second partition plate member; 41, 141: first bearing (bearing) (connected member); 42: second bearing (bearing); 45: low-stage side roller; 46: high-stage side roller.

Claims

1. A multi-stage rotary compressor, comprising: case; The rotating shaft is housed inside the aforementioned casing. The driving element causes the aforementioned rotating shaft to rotate; A low-level suction tube guides the working fluid from outside the aforementioned housing; The low-level compression mechanism compresses the working fluid introduced from the low-level suction pipe to an intermediate pressure. The low-level discharge pipe discharges the working fluid, which is compressed by the low-level compression mechanism and is at an intermediate pressure, to the outside of the housing. The advanced suction pipe guides the working fluid at intermediate pressure discharged from the aforementioned low-level discharge pipe; The advanced compression mechanism compresses the working fluid, which is at an intermediate pressure and introduced from the advanced suction pipe, into a high pressure. A partition plate separates the lower-level compression mechanism section from the higher-level compression mechanism section; and A pair of bearings support the aforementioned rotating shaft. The aforementioned low-level compression mechanism includes: The lower-level side cylinder block forms the lower-level side cylinder chamber; The lower-level side roller is capable of eccentric rotation within the aforementioned lower-level side cylinder chamber; and The lower-stage side blades divide the aforementioned lower-stage side cylinder chamber into a lower-stage side intake chamber and a lower-stage side compression chamber. The aforementioned advanced compression mechanism has: Advanced side cylinder block, forming advanced side cylinder chamber; The advanced side rollers are capable of eccentric rotation within the aforementioned advanced side cylinder chamber; and The advanced side blades divide the aforementioned advanced side cylinder chamber into an advanced side intake chamber and an advanced side compression chamber. The aforementioned low-level inhalation tube, the aforementioned low-level discharge tube, and the aforementioned high-level inhalation tube are connected to the same connected components.

2. The multi-stage rotary compressor according to claim 1, wherein, The connected component is one of the lower-level side cylinder block and the higher-level side cylinder block.

3. The multi-stage rotary compressor according to claim 1, wherein, The aforementioned connected component is the aforementioned lower-level side cylinder block.

4. The multi-stage rotary compressor according to any one of claims 1 to 3, wherein, The aforementioned connected components are fixed to the aforementioned housing.

5. The multi-stage rotary compressor according to claim 1, wherein, When the angle between the aforementioned primary suction pipe and the aforementioned primary side blade in the rotation direction of the aforementioned primary side roller is defined as angle θ1, When the angle between the aforementioned advanced suction pipe and the aforementioned low-level side blade in the rotation direction of the aforementioned low-level side roller is set as angle θ2, The angle θ2 mentioned above is greater than the angle θ1 mentioned above.

6. The multi-stage rotary compressor according to claim 1, wherein, At least one of the aforementioned advanced side cylinder and the aforementioned partition plate is provided with a communication passage that communicates with the aforementioned advanced intake pipe. The aforementioned connecting path guides the aforementioned working fluid to the aforementioned advanced side intake chamber.

7. The multi-stage rotary compressor according to claim 6, wherein, The aforementioned connecting paths are formed only on the aforementioned partition plates.

8. The multi-stage rotary compressor according to claim 1, wherein, The aforementioned lower-level side cylinder chamber and the aforementioned higher-level side cylinder chamber are eccentric relative to the aforementioned rotating shaft. The angle between the eccentric direction of the aforementioned advanced side cylinder chamber and the rotation direction of the aforementioned advanced side blade in the aforementioned advanced side roller is greater than the angle between the eccentric direction of the aforementioned low-level side cylinder chamber and the rotation direction of the aforementioned low-level side blade in the aforementioned low-level side roller.

9. The multi-stage rotary compressor according to claim 1, wherein, The connected components are one of the pair of bearings.

10. The multi-stage rotary compressor according to claim 1, wherein, The aforementioned partition plate is composed of multiple partition plate components stacked together, and the partition plate component closest to the aforementioned advanced compression mechanism does not form a recess that becomes the flow path for the aforementioned working fluid.

11. A refrigeration cycle apparatus, comprising: The multi-stage rotary compressor according to any one of claims 1 to 10; The radiator is connected to the discharge section of the aforementioned multi-stage rotary compressor; An expansion device is connected to the downstream side of the aforementioned radiator; and The evaporator is connected between the downstream side of the expansion device and the inlet of the multi-stage rotary compressor.

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