Two-cylinder rotary compressor

Abstract

To provide techniques for flattening a compression mechanism in a two-cylinder rotary compressor.SOLUTION: A two-cylinder rotary compressor includes: a head to which an intake pipe is connected; a first cylinder in which a first piston rotates eccentrically in the interior thereof; a second cylinder in which a second piston rotates eccentrically in the interior thereof; a middle plate provided between the first cylinder and the second cylinder; a main flow path passing, from the intake pipe, through the head, the first cylinder, and the middle plate to the second cylinder; a first branch flow path branching from the main flow path into the interior of the first cylinder; and a second branch flow path branching from the main flow path into the interior of the second cylinder.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a two-cylinder rotary compressor. [Background technology]

[0002] Patent Document 1 discloses a two-cylinder rotary compressor equipped with a compression mechanism and a rotary drive unit. Patent Document 1 discloses that the working gas is introduced into both cylinder chambers through two suction passages branched from one suction pipe connected to a partition plate at a branching part provided in the partition plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5070097 Summary of the Invention [Problem to be solved by the invention]

[0004] In a rotary compressor, there is a demand for a flatter compression mechanism in order to improve performance.

[0005] The present disclosure provides a technique for flattening a compression mechanism in a two-cylinder rotary compressor. [Means for solving the problem]

[0006] The two-cylinder rotary compressor according to the first aspect is A head to which an intake pipe is connected; a first cylinder in which a first piston rotates eccentrically; a second cylinder in which a second piston rotates eccentrically; a middle plate provided between the first cylinder and the second cylinder; a main flow passage extending from the intake pipe through the head, the first cylinder, and the middle plate to the second cylinder; a first branch passage branching from the main passage into the inside of the first cylinder; a second branch passage branching from the main passage into the second cylinder; Equipped with.

[0007] According to the two-cylinder rotary compressor of the first aspect, the compression mechanism can be made flat.

[0008] A two-cylinder rotary compressor according to a second aspect is the two-cylinder rotary compressor according to the first aspect, wherein a flow path area in the main flow path is equal to or larger than a flow path area in an intake port to which the intake pipe is connected.

[0009] A two-cylinder rotary compressor according to a third aspect is the two-cylinder rotary compressor according to either the first or second aspect, in which a flow path area in the second branch flow path is different from a flow path area in the first branch flow path.

[0010] A two-cylinder rotary compressor of a fourth aspect is the two-cylinder rotary compressor of any one of the first aspect to the third aspect, in which a sum of a flow path area in the first branch flow path and a flow path area in the second branch flow path is equal to or greater than a flow path area in the main flow path.

[0011] A two-cylinder rotary compressor according to a fifth aspect is the two-cylinder rotary compressor according to any of the first aspect to the fourth aspect, further comprising: the first piston; and a first blade dividing a first compression chamber formed between the first cylinder and the first piston into a first high pressure chamber and a first low pressure chamber, wherein a center of a first connection port, through which the first branch flow passage is connected to the first low pressure chamber, is provided on the first blade side with respect to a line connecting the main flow passage and a center of rotation of the first piston; and further comprising: the second piston; and a second blade dividing a second compression chamber formed between the second cylinder and the second piston into a second high pressure chamber and a second low pressure chamber, wherein a center of a second connection port, through which the second branch flow passage is connected to the second low pressure chamber, is provided on the second blade side with respect to a line connecting the main flow passage and a center of rotation of the second piston.

[0012] A two-cylinder rotary compressor of a sixth aspect is the two-cylinder rotary compressor of any of the first aspect to the fifth aspect, further comprising: a retaining member that retains the head, the first cylinder, the middle plate, and the second cylinder; a container that houses the head, the first cylinder, the middle plate, the second cylinder, and the retaining member; and an accumulator connected to the intake pipe, wherein the retaining member is fixed to the container, and a lower part of the accumulator is provided below the retaining member.

[0013] A two-cylinder rotary compressor according to a seventh aspect is the two-cylinder rotary compressor according to any one of the first aspect to the sixth aspect, in which the refrigerant used is carbon dioxide.

[0014] A two-cylinder rotary compressor according to an eighth aspect is the two-cylinder rotary compressor according to any of the first aspect to the seventh aspect, wherein the first cylinder has, on the outside of an inner diameter of the first cylinder, a first through hole penetrating in a thickness direction, and a first groove portion formed from the first through hole to the inside of the first cylinder, the middle plate has a second through hole penetrating in the thickness direction, and the second cylinder has, on the outside of an inner diameter of the second cylinder, a vertical hole extending in the thickness direction, and a second groove portion formed from the vertical hole to the inside of the second cylinder, each of the first through hole, the second through hole, and the vertical hole constitute a part of the main flow path, the first groove portion constitutes the first branch flow path, and the second groove portion constitutes the second branch flow path. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of a rotary compressor according to this embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the rotary compressor according to the present embodiment. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of the rotary compressor according to the present embodiment. [Figure 4] FIG. 4 is a plan view of the head in the rotary compressor according to the present embodiment. [Diagram 5]FIG. 5 is a plan view of the cylinder in the rotary compressor according to the present embodiment. [Figure 6] FIG. 6 is a bottom view of the cylinder in the rotary compressor according to the present embodiment. [Figure 7] FIG. 7 is a plan view of the middle plate in the rotary compressor according to the present embodiment. [Figure 8] FIG. 8 is a plan view of the cylinder in the rotary compressor according to the present embodiment. [Figure 9] FIG. 9 is a bottom view of the cylinder in the rotary compressor according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Specific examples of the rotary compressor of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0017] In addition, in the description of the specification and drawings of each embodiment, components having substantially the same or corresponding functional configurations may be denoted by the same reference numerals to avoid redundant explanations. In addition, in order to facilitate understanding, the scale of each part in the drawings may differ from the actual scale.

[0018] In the directions of parallel, right-angle, orthogonal, horizontal, vertical, up-down, left-right, front-back, etc., deviations are permitted to the extent that they do not impair the effects of the embodiment. The shape of the corners is not limited to right angles and may be rounded. Parallel, right-angle, orthogonal, horizontal, and vertical may include approximately parallel, approximately right-angle, approximately orthogonal, approximately horizontal, and approximately vertical, respectively.

[0019] For example, "approximately parallel" means that even if two lines or two surfaces are not completely parallel to each other, they can be treated as being parallel to each other within the range allowed in manufacturing. As with "approximately parallel," "approximately right angle," "approximately perpendicular," "approximately horizontal," and "approximately vertical" are also intended to fall under the respective terms as long as the relative positional relationship between the two lines or two surfaces is within the range allowed in manufacturing.

[0020] A rotary compressor according to this embodiment will be described. The rotary compressor according to this embodiment includes a head to which an intake pipe is connected, a first cylinder in which a first piston rotates eccentrically, a second cylinder in which a second piston rotates eccentrically, and a middle plate provided between the first and second cylinders. The rotary compressor according to this embodiment includes a main flow path that runs from the intake pipe through the head, the first cylinder, and the middle plate to the second cylinder. The rotary compressor according to this embodiment includes a first branch flow path that branches from the main flow path into the inside of the first cylinder, and a second branch flow path that branches from the main flow path into the inside of the second cylinder.

[0021] The rotary device according to the present embodiment will be described using a rotary compressor 1, which is an example of the rotary device according to the present embodiment. FIG. 1 is a perspective view of the rotary compressor 1, which is an example of the rotary compressor according to the present embodiment. FIG. 2 is a cross-sectional view of the rotary compressor 1, which is an example of the rotary compressor according to the present embodiment. FIG. 3 is an enlarged cross-sectional view of the rotary compressor 1, which is an example of the rotary compressor according to the present embodiment.

[0022] For ease of explanation, a virtual three-dimensional coordinate system (XYZ Cartesian coordinate system) consisting of mutually orthogonal X-axis, Y-axis, and Z-axis (XYZ axes) may be set in the drawings. For example, for a coordinate axis perpendicular to the paper surface of the drawing, a black circle in the circle of the coordinate axis indicates that the coordinate axis faces toward the front of the paper surface. Also, a cross in the circle of the coordinate axis indicates that the coordinate axis faces toward the back of the paper surface.

[0023] However, this coordinate system is defined for the purpose of explanation and does not limit the attitude of the rotary compressor etc. according to this embodiment.

[0024] In the drawings below, the piston of the rotary compressor rotates on an XY plane that is a plane parallel to the X-axis and Y-axis directions.

[0025] A view of an object viewed from the +Z side in the opposite direction to the Z axis along the Z axis direction is called a plan view. Viewing an object viewed from the +Z side in the opposite direction to the Z axis along the Z axis direction is called a plan view. Viewing an object viewed from the -Z side in the direction of the Z axis along the Z axis direction is called a bottom view. Viewing an object viewed from the -Z side in the direction of the Z axis along the Z axis direction is called a bottom view.

[0026] The rotary compressor 1 compresses a refrigerant. The refrigerant used in the rotary compressor 1 is, for example, carbon dioxide. The refrigerant is not limited to carbon dioxide, and may be, for example, a fluorocarbon-based refrigerant. The rotary compressor 1 includes a compressor main body 10 and an accumulator 20.

[0027] [Compressor body 10] The compressor body 10 includes a container 11, an intake pipe 12, an exhaust pipe 13, and a power terminal 15. The container 11 also includes a plate 14 for mounting the compressor body 10 thereon.

[0028] The compressor body 10 includes therein a compression section 70 and an electric motor section 80. The electric motor section 80 rotates a main shaft 81. The compression section 70 compresses the refrigerant supplied from the intake pipe 12. The refrigerant compressed in the compression section 70 is discharged from the exhaust pipe 13 to the outside of the rotary compressor 1. The compression section 70 constitutes a compression mechanism.

[0029] The electric motor unit 80 rotates the main shaft 81. In the compression unit 70, the main shaft 81 rotated by the electric motor unit 80 rotates each of the pistons 61 and 62. Each of the pistons 61 and 62 rotates eccentrically when the main shaft 81 rotates. As each of the pistons 61 and 62 rotates, the refrigerant is compressed in the compression unit 70.

[0030] The compression section 70 includes a head 31, a cylinder 41, a middle plate 50, a cylinder 42, and the head 32. The head 31, the cylinder 41, the middle plate 50, the cylinder 42, and the head 32 are stacked in order from the bottom up. A main shaft 81 passes through each of the head 31, the cylinder 41, the middle plate 50, the cylinder 42, and the head 32.

[0031] Compression section 70 includes piston 61 that rotates eccentrically around main shaft 81 inside cylinder 41. Compression section 70 also includes piston 62 that rotates eccentrically around main shaft 81 inside cylinder 42.

[0032] [Head 31] The head 31 will now be described. Fig. 4 is a plan view of the lower head 31 in the rotary compressor 1, which is an example of the rotary compressor according to this embodiment.

[0033] The head 31 has a through hole 31h that extends along the Y-axis direction and then extends along the Z-axis direction from the middle. One side of the through hole 31h is connected to the intake pipe 12. The other side of the through hole 31h is connected to a through hole 41h of the cylinder 41.

[0034] The head 31 has an upper surface 31S. The cylinder 41 is placed on the upper surface 31S. In addition, a piston 61 rotates on the upper surface 31S.

[0035] [Cylinder 41] Next, the cylinder 41 will be described. Fig. 5 is a plan view of the cylinder 41 in the rotary compressor 1, which is an example of the rotary compressor according to this embodiment. Fig. 6 is a bottom view of the cylinder 41 in the rotary compressor 1, which is an example of the rotary compressor according to this embodiment. Note that Figs. 5 and 6 also show a piston 61 that eccentrically rotates inside the cylinder 41.

[0036] The cylinder 41 has a through hole 41h penetrating along the thickness direction, i.e., the Z-axis direction. The through hole 41h is provided outside the inner diameter of the cylinder 41. One end of the through hole 41h is connected to the through hole 31h of the head 31. The other end of the through hole 41h is connected to the through hole 50h of the middle plate 50. The cylinder 41 also has a groove portion 41g that is a groove formed from the through hole 41h to the inside of the cylinder 41.

[0037] A center 41gc of the connection port in the groove portion 41g of the cylinder 41 is provided on the blade 61b side of the piston 61 with respect to a line L1 that connects the rotation center 41c of the piston 61 and the center of the through hole 41h.

[0038] [Middle Plate 50] Next, a description will be given of the middle plate 50. Fig. 7 is a plan view of the middle plate 50 in the rotary compressor 1, which is an example of the rotary compressor according to this embodiment.

[0039] The middle plate 50 has a through hole 50h penetrating along the thickness direction, i.e., the Z-axis direction. One end of the through hole 50h is connected to the through hole 41h of the cylinder 41. The other end of the through hole 50h is connected to the vertical hole 42h of the cylinder 42.

[0040] [Cylinder 42] Next, the cylinder 42 will be described. Fig. 8 is a plan view of the cylinder 42 in the rotary compressor 1, which is an example of the rotary compressor according to this embodiment. Fig. 9 is a bottom view of the cylinder 42 in the rotary compressor 1, which is an example of the rotary compressor according to this embodiment. Note that Figs. 8 and 9 also show a piston 62 that eccentrically rotates inside the cylinder 42.

[0041] The cylinder 42 has a vertical hole 42h formed partway through the thickness of the cylinder 42 along the thickness direction, i.e., the Z-axis direction. The vertical hole 42h is provided outside the inner diameter of the cylinder 42. The vertical hole 42h is connected to a through hole 50h of the middle plate 50. The cylinder 42 also has a groove portion 42g that is a groove formed from the vertical hole 42h to the inside of the cylinder 42.

[0042] The center 42gc of the connection port in the groove portion 42g of the cylinder 42 is provided on the blade 62b side of the piston 62 with respect to a line L2 connecting the rotation center 42c of the piston 62 and the center of the vertical hole 42h.

[0043] [Head 32] The head 32 holds the head 31, the cylinder 41, the middle plate 50, and the cylinder 42. The head 32 is fixed to the container 11. For example, the head 32 is fixed to the container 11 by welding. The lower part of the accumulator 20 is provided below the head 32.

[0044] [Piston 61] The piston 61 rotates eccentrically inside the cylinder 41. The piston 61 has a blade 61b that divides the compression chamber 41CS of the cylinder 41 into a high pressure chamber 41HS and a low pressure chamber 41LS. The blade 61b is fixed to the cylinder 41 by a bush 41b.

[0045] [Piston 62] The piston 62 rotates eccentrically inside the cylinder 42. The piston 62 has a blade 62b that divides the compression chamber 42CS of the cylinder 42 into a high pressure chamber 42HS and a low pressure chamber 42LS. The blade 62b is fixed to the cylinder 42 by a bush 42b.

[0046] [Main flow MFP] As shown in FIG. 3, the rotary compressor 1 has a main flow path MFP that runs from the intake pipe 12 through the head 31, the cylinder 41, and the middle plate 50 to the cylinder 42 via the through hole 31h, the through hole 41h, the through hole 50h, and the vertical hole 42h.

[0047] The flow path area SM of the main flow path MFP may be equal to or larger than the flow path area SSC of the intake port to which the intake pipe 12 is connected. In the present disclosure, the flow path area is the area of ​​a cross section of the flow path cut by a plane perpendicular to the direction in which the refrigerant flows. For example, the flow path area SM is the area of ​​a cross section cut by a plane parallel to the XY plane of the through hole 41h, the through hole 50h, and the vertical hole 42h. In addition, the flow path area SM is the area of ​​a cross section cut by a plane parallel to the YZ plane of a portion of the through hole 41h extending in the X-axis direction, or the area of ​​a cross section cut by a plane parallel to the XY plane of a portion of the through hole 41h extending in the Y-axis direction.

[0048] [Branch flow path SFP1, branch flow path SFP2] 3, the rotary compressor 1 includes a branch flow path SFP1 that branches from the main flow path MFP into the inside of the cylinder 41 by a groove portion 41g. The rotary compressor 1 also includes a branch flow path SFP2 that branches from the main flow path MFP into the inside of the cylinder 42 by a groove portion 42g.

[0049] The flow path area SS2 in the branch flow path SFP2 may be different from the flow path area SS1 in the branch flow path SFP1. For example, the flow path area SS1 in the branch flow path SFP1 and the flow path area SS2 in the branch flow path SFP2 may be determined so as to optimize the flow rate of the refrigerant in the branch flow path SFP1 and the flow rate of the refrigerant in the branch flow path SFP2. Also, for example, the flow path area SS1 in the branch flow path SFP1 and the flow path area SS2 in the branch flow path SFP2 may be determined so that the flow rate of the refrigerant in the branch flow path SFP1 and the flow rate of the refrigerant in the branch flow path SFP2 are equal.

[0050] The sum of the flow path area SS1 in the branch flow path SFP1 and the flow path area SS2 in the branch flow path SFP2 may be equal to or larger than the flow path area SM in the main flow path MFP. By making the sum of the flow path area SS1 in the branch flow path SFP1 and the flow path area SS2 in the branch flow path SFP2 equal to or larger than the flow path area SM in the main flow path MFP, the pressure loss in the branch flow paths SFP1 and SFP2 can be reduced.

[0051] The flow path area SS1 in the branch flow path SFP1 is the cross-sectional area of ​​the groove portion 41g cut along a plane perpendicular to the extension direction of the groove portion 41g. The flow path area SS2 in the branch flow path SFP2 is the cross-sectional area of ​​the groove portion 42g cut along a plane perpendicular to the extension direction of the groove portion 42g.

[0052] The cylinder 41 is supplied with refrigerant that has passed through a branch flow path SFP1 that branches off from the main flow path MFP. For example, if the intake pipe 12 is directly connected to the cylinder 41, the cylinder 41 cannot be made thinner than the outer diameter of the intake pipe 12. Since the refrigerant from the intake pipe 12 is supplied to the cylinder 41 via the main flow path MFP and the branch flow path SFP1, the cylinder 41 can be made thinner. Similarly, since the refrigerant from the intake pipe 12 is supplied to the cylinder 42 via the main flow path MFP and the branch flow path SFP2, the cylinder 42 can be made thinner.

[0053] Furthermore, for example, as disclosed in Patent Document 1, if the intake pipe 12 is directly connected to the middle plate 50, the middle plate 50 cannot be made thinner than the outer diameter of the intake pipe 12. Since the intake pipe 12 is not connected to the middle plate 50, the middle plate 50 can be made thinner.

[0054] The cylinder 41 is an example of a first cylinder, the cylinder 42 is an example of a second cylinder, the branch flow path SFP1 is an example of a first branch flow path, and the branch flow path SFP2 is an example of a second branch flow path.

[0055] <Summary> In the two-cylinder rotary compressor according to this embodiment, the first cylinder, the second cylinder, and the middle plate are made thin, thereby enabling the compression mechanism to be flattened. In the two-cylinder rotary compressor according to this embodiment, the main shaft can be shortened by flattening the compression mechanism. In the two-cylinder rotary compressor according to this embodiment, the main shaft can be shortened by shortening the main shaft, thereby enabling the effect of axial deflection of the main shaft to be reduced.

[0056] In addition, with the two-cylinder rotary compressor according to this embodiment, the intake pipe is connected to the head, so the intake holes in the cylinders can be designed regardless of the shape of the cylinder. With the two-cylinder rotary compressor according to this embodiment, the intake holes in the cylinders can be designed regardless of the shape of the cylinder, so the degree of freedom in design can be increased.

[0057] Furthermore, with the two-cylinder rotary compressor according to this embodiment, the number of parts around the suction part can be reduced. With the two-cylinder rotary compressor according to this embodiment, the number of parts around the suction part can be reduced, thereby reducing manufacturing costs.

[0058] According to the two-cylinder rotary compressor of this embodiment, the flow path area in the main flow path is set to be equal to or larger than the flow path area at the suction port to which the intake pipe is connected, thereby reducing the pressure loss of the refrigerant inside the two-cylinder rotary compressor.

[0059] In the two-cylinder rotary compressor according to this embodiment, the flow path area in the second branch flow path is different from the flow path area in the first branch flow path, so that the amount of refrigerant distributed to each of the first and second cylinders can be optimized.

[0060] According to the two-cylinder rotary compressor of this embodiment, the sum of the flow path area in the first branch flow path and the flow path area in the second branch flow path is set to be equal to or larger than the flow path area in the main flow path, thereby reducing the pressure loss of the refrigerant inside the two-cylinder rotary compressor.

[0061] According to the two-cylinder rotary compressor of this embodiment, the center of the first connection port in the first branch flow path is provided on the first blade side with respect to a line connecting the main flow path and the rotation center of the first piston, so that the first connection port can be completed to close quickly. In other words, according to the two-cylinder rotary compressor of this embodiment, the angle at which the first connection port is completed to close can be reduced. Similarly, according to the two-cylinder rotary compressor of this embodiment, the center of the second connection port in the second branch flow path is provided on the second blade side with respect to a line connecting the main flow path and the rotation center of the second piston, so that the second connection port can be completed to close quickly. In other words, according to the two-cylinder rotary compressor of this embodiment, the angle at which the second connection port is completed to close can be reduced.

[0062] According to the two-cylinder rotary compressor of this embodiment, the center of gravity can be lowered by providing the lower part of the accumulator below the holding member. According to the two-cylinder rotary compressor of this embodiment, the center of gravity of the two-cylinder rotary compressor can be lowered, thereby reducing vibration.

[0063] In the two-cylinder rotary compressor according to this embodiment, the main flow path is formed by a through hole and a vertical hole, and the branch flow path is formed by a groove, which increases the design freedom of the shape of the suction portion of the cylinder. Also, in the two-cylinder rotary compressor according to this embodiment, the branch flow path is formed by a groove, which simplifies the processing of the suction portion of the cylinder. And, in the two-cylinder rotary compressor according to this embodiment, the manufacturing cost can be reduced by simplifying the processing of the suction portion of the cylinder.

[0064] Although the embodiment has been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. Various modifications and improvements, such as combinations and substitutions with part or all of other embodiments, are possible. [Explanation of symbols]

[0065] 1 Rotary Compressor 10 Compressor body 11 Container 12 Intake pipe 13 Exhaust pipe 20 Accumulator 31 Head 31h through hole 32 Head 41, 42 Cylinders 41b, 42b Bush 41c, 42c Rotation center 41g, 42g groove 41gc, 42gc center 41h through hole 42h Vertical hole 41CS, 42CS compression chamber 41HS, 42HS Hyperbaric Chambers 41LS, 42LS Low pressure chamber 50 Middle Plate 50h through hole 61, 62 Piston 61b, 62b blade 70 Compression section 80 Electric part 81 Main shaft MFP main channel SFP1, SFP2 branch flow path SM, SS1, SS2, SSC Flow area

Claims

1. The main shaft and The head to which the intake pipe is connected, A first cylinder is provided inside which a first piston rotates eccentrically due to the rotation of the main shaft, A second cylinder is provided inside which a second piston rotates eccentrically due to the rotation of the main shaft, A middle plate provided between the first cylinder and the second cylinder, A main passage extends from the intake pipe through the head, the first cylinder and the middle plate to the second cylinder, From the main flow path, a first branch flow path branches into the interior of the first cylinder, A second branching channel branches off from the main channel into the interior of the second cylinder, Equipped with, The main passage is provided in the head and includes a first passage extending radially from the intake pipe to the main shaft and a second passage extending axially from the main shaft. The first passage has a recess formed inward from the second passage in the head. Two-cylinder rotary compressor.

2. The flow area in the main flow path is greater than or equal to the flow area at the intake port to which the intake pipe is connected. A two-cylinder rotary compressor according to claim 1.

3. The flow area in the second branch channel is different from the flow area in the first branch channel. A two-cylinder rotary compressor according to either claim 1 or claim 2.

4. The sum of the flow area in the first branch channel and the flow area in the second branch channel is greater than or equal to the flow area in the main channel. A two-cylinder rotary compressor according to either claim 1 or claim 2.

5. The device further comprises the first piston and a first blade that divides the first compression chamber formed between the first cylinder and the first piston into a first high-pressure chamber and a first low-pressure chamber. The center of the first connection port to which the first branch flow path is connected to the first low-pressure chamber is located on the first blade side with respect to the line connecting the main flow path and the rotation center of the first piston. The device further comprises the second piston and a second blade that divides the second compression chamber formed between the second cylinder and the second piston into a second high-pressure chamber and a second low-pressure chamber. The center of the second connection port to which the second branch channel is connected to the second low-pressure chamber is located on the second blade side with respect to the line connecting the main channel and the rotation center of the second piston. A two-cylinder rotary compressor according to either claim 1 or claim 2.

6. A retaining member that holds the head, the first cylinder, the middle plate, and the second cylinder, A container that houses the head, the first cylinder, the middle plate, the second cylinder, and the holding member inside, The system further comprises an accumulator connected to the intake pipe, The retaining member is fixed to the container, The lower part of the accumulator is provided below the holding member. A two-cylinder rotary compressor according to either claim 1 or claim 2.

7. The refrigerant used is carbon dioxide. A two-cylinder rotary compressor according to either claim 1 or claim 2.

8. The first cylinder is The first cylinder has a first through hole extending through in the thickness direction on the outer side of its inner diameter, It has a first groove formed from the first through hole to the inside of the first cylinder, The middle plate has a second through hole that penetrates in the thickness direction, The second cylinder is The second cylinder has a vertical hole extending in the thickness direction on the outer side of its inner diameter, It has a second groove formed from the vertical hole to the inside of the second cylinder, Each of the first through-hole, the second through-hole, and the vertical hole constitutes a part of the main flow path. The first groove constitutes the first branch channel, The second groove constitutes the second branch channel, A two-cylinder rotary compressor according to either claim 1 or claim 2.

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