Rolling piston type electric compressor

Abstract

A rolling piston type electric compressor (1) comprises a case (10) and a compression mechanism (20). The compression mechanism (20) includes a first cylinder (125), a front side plate (140), and a middle side plate (160). Each of the front side plate (140) and the middle side plate (160) is in contact with an inner peripheral surface (15) of the case (10) in a direction intersecting a first direction. An oil storage chamber (28) surrounded by the case (10), the first cylinder (125), the front side plate (140), and the middle side plate (160) is formed. A first supply path (50) which branches from a discharge path (3) and is capable of supplying a lubricant oil separated from an oil separator (40) to the oil storage chamber (28) is formed. A second supply path to which the lubricating oil is supplied from the oil storage chamber (28) and which is capable of supplying the lubricating oil to a sliding position of the compression mechanism (20) is formed.

Description

Rolling piston type electric compressor

[0001] The present disclosure relates to a rolling piston type electric compressor.

[0002] Japanese Patent Laid-Open Publication No. 2005-105985 (Patent Document 1) is a prior art document that discloses a horizontal rotary compressor. The horizontal rotary compressor described in Patent Document 1 includes a sealed container that houses a rotary compression mechanism. An oil reservoir is provided at the bottom of the sealed container to collect oil to be supplied to the rotary compression mechanism.

[0003] Japanese Patent Laid-Open Publication No. 2017-198159 (Patent Document 2) is a prior art document that discloses an electric compressor. The electric compressor described in Patent Document 2 includes a cylindrical main housing with a bottom. An oil reservoir chamber is defined in a lower portion of the cylindrical main housing to store lubricating oil separated by an oil separator.

[0004] JP 2005-105985 A JP 2017-198159 A

[0005] The horizontal rotary compressor described in Patent Document 1 has an oil reservoir that stores lubricating oil throughout the entire internal space of the case, which can make it difficult to suck up the lubricating oil when supplying it to the compression mechanism by siphoning it up, etc. Therefore, in Patent Document 1, the reliability of the rolling piston type electric compressor can be reduced by insufficient supply of lubricating oil to the sliding positions of the compression mechanism.

[0006] The electric compressor described in Patent Document 2 has an oil reservoir in a thick portion of the case, which may require complex processing and increase costs, potentially making the rolling piston type electric compressor expensive.

[0007] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a rolling piston type electric compressor that is inexpensive and highly reliable.

[0008] A rolling piston type electric compressor according to the present disclosure includes a case, an electric motor, a compression mechanism, and an oil separator. The case has a suction path and a discharge path. The electric motor is housed in the case. The compression mechanism is housed in the case and is arranged horizontally alongside the electric motor. The compression mechanism draws in refrigerant that has been drawn in through the suction path and passed through the electric motor, compresses it, and discharges it to the discharge path. The oil separator is provided in the discharge path and separates lubricating oil mixed in the refrigerant from the refrigerant. The compression mechanism includes a rotating shaft, a first piston, a first vane, a first cylinder, a front side plate, a second piston, a second vane, a second cylinder, a rear side plate, and a middle side plate. The rotating shaft is driven by the electric motor and has an axis extending in a first direction. The first piston is rotatable eccentrically with respect to the axis as the rotating shaft rotates. The first vane abuts the first piston in a direction intersecting the first direction. The first cylinder houses a first piston and a first vane, and a first compression chamber for compressing a refrigerant is formed between the first piston and the first vane. The front side plate abuts the first cylinder in the first direction and is in contact with the first compression chamber. The second piston is spaced from the first piston and is positioned on the opposite side of the first piston from the side where the front side plate is positioned in the first direction, and is rotatable eccentrically with respect to the axis as the rotary shaft rotates. The second vane abuts the second piston in a direction intersecting the first direction. The second cylinder houses the second piston and the second vane, and a second compression chamber for compressing a refrigerant is formed between the second piston and the second vane. The rear side plate abuts the second cylinder from the opposite side of the first direction from the side where the front side plate is positioned, and is in contact with the second compression chamber. The middle side plate is positioned between the first cylinder and the second cylinder in the first direction, and separates the first compression chamber from the second compression chamber. The front side plate and the middle side plate each abut against an inner peripheral surface of the case in a direction intersecting the first direction, and an oil reservoir is formed surrounded by the case, the first cylinder, the front side plate, and the middle side plate.A first supply path is formed branching from the discharge path and capable of supplying the lubricating oil separated by the oil separator to the oil reservoir, and a second supply path is formed to receive the lubricating oil from the oil reservoir and to supply the lubricating oil to a sliding position of the compression mechanism.

[0009] In one embodiment of the present disclosure, the first vane is disposed inside the case on the lower side in a vertical direction intersecting the first direction, and a hole is formed in the outer peripheral surface of the first cylinder through which lubricating oil can be supplied from the oil reservoir to the lower end side of the first vane.

[0010] In one embodiment of the present disclosure, the second supply path is configured to be able to supply lubricating oil to a sliding portion between the front side plate and the rotating shaft.

[0011] In one embodiment of the present disclosure, the second supply path is configured to be able to supply lubricating oil to a sliding portion between the rear side plate and the rotary shaft.

[0012] In one embodiment of the present disclosure, the second supply path is configured to be able to supply lubricating oil to a sliding point between at least one of the first vane and the second vane and at least one of the first cylinder and the second cylinder corresponding to at least one of the first vane and the second vane.

[0013] In one embodiment of the present disclosure, the second supply path is configured to be able to supply lubricating oil to a sliding portion between the middle side plate and at least one of the first piston and the second piston.

[0014] In one embodiment of the present disclosure, the second supply path is configured to be able to supply lubricating oil to a sealed location between the rotating shaft and the middle side plate.

[0015] In one embodiment of the present disclosure, a throttle portion in which the cross-sectional area of ​​the flow path of the lubricating oil is reduced is provided midway along the second supply path.

[0016] According to the present disclosure, it is possible to provide a rolling piston type electric compressor that is inexpensive and highly reliable.

[0017] 10 is a top view showing the configuration of a rolling piston type electric compressor according to an embodiment of the present disclosure. 10 is a front view showing the configuration of the rolling piston type electric compressor of FIG. 1, as viewed from the direction of the arrows II. 10 is a partial cross-sectional view showing the configuration of the rolling piston type electric compressor of FIG. 1, as viewed from the direction of the arrows III-III. 10 is a cross-sectional view showing the configuration of the rolling piston type electric compressor of FIG. 3, as viewed from the direction of the arrows IV-IV. 10 is an exploded perspective view showing a path through which refrigerant is compressed in a rolling piston type electric compressor according to an embodiment of the present disclosure. 10 is a cross-sectional view showing the configuration of the rolling piston type electric compressor of FIG. 1, as viewed from the direction of the arrows VI-VI. 10 is an exploded perspective view showing a lubricating oil supply path in a rolling piston type electric compressor according to an embodiment of the present disclosure. 10 is a partial cross-sectional view showing the configuration of the rolling piston type electric compressor of FIG. 1, as viewed from the direction of the arrows VIII-VIII. 10 is a cross-sectional view showing the configuration of the rolling piston type electric compressor of FIG. 3, as viewed from the direction of the arrows IX-IX. 10 is a cross-sectional view showing the configuration of the lubricating oil supply path by enlarging a portion XI in FIG. A partial cross-sectional view of the configuration of the rolling piston type electric compressor of Figure 1, as seen from the direction of the arrows along line XII-XII. A cross-sectional view of the configuration of the lubricating oil supply path, with an enlarged view of part XIII in Figure 12. A cross-sectional view of the configuration of the rolling piston type electric compressor of Figure 3, as seen from the direction of the arrows along line XIV-XIV. A cross-sectional view of the configuration of the rolling piston type electric compressor of Figure 3, as seen from the direction of the arrows along line XV-XV. A cross-sectional view of the configuration of the rolling piston type electric compressor of Figure 3, as seen from the direction of the arrows along line XVI-XVI.

[0018] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts are denoted by the same reference characters, and description thereof may not be repeated.

[0019] In the drawings, the direction perpendicular to the direction in which the axis of the rotation shaft extends and the vertical direction is designated as the X direction, the vertical direction is designated as the Y direction, and the direction in which the axis of the rotation shaft extends is designated as the Z direction. Also, in the drawings, some parts, such as the connection structure between components, are omitted. Furthermore, for the sake of convenience, cross-sectional portions are not hatched in Figures 4 and 9.

[0020] First, the overall configuration of a rolling piston type electric compressor will be described. Fig. 1 is a top view showing the configuration of a rolling piston type electric compressor according to an embodiment of the present disclosure. Fig. 2 is a front view of the configuration of the rolling piston type electric compressor of Fig. 1, as seen from the direction of the arrows along line II. Fig. 3 is a partial cross-sectional view of the configuration of the rolling piston type electric compressor of Fig. 1, as seen from the direction of the arrows along line III-III.

[0021] As shown in FIGS. 1 to 3, the rolling piston type electric compressor 1 can be mounted on, for example, an automobile. The rolling piston type electric compressor 1 is used, for example, for air conditioning of the automobile. The rolling piston type electric compressor 1 in this embodiment is used to compress, for example, carbon dioxide (CO ２ ) is used as a refrigerant.

[0022] The rolling piston type electric compressor 1 in this embodiment includes a case 10, a compression mechanism 20, an electric motor 30, and an oil separator 40.

[0023] The case 10 forms the outer shape of the rolling piston type electric compressor 1. The case 10 is made of a material such as aluminum or an aluminum alloy.

[0024] The case 10 includes a first case 11 and a second case 12. The first case 11 and the second case 12 are aligned in a first direction (Z direction).

[0025] The first case 11 is provided with an intake port 13 through which a refrigerant (not shown) is drawn in. The intake port 13 penetrates an inner circumferential surface 15. The second case 12 is provided with an outlet port 14 through which the refrigerant is discharged. The outlet port 14 is located in a thick portion at an end of the case 10 in the first direction (Z direction).

[0026] The case 10 is provided with a suction path 2 and a discharge path 3. Refrigerant is drawn into the case 10 through the suction path 2. The suction port 13 constitutes a part of the suction path 2. The refrigerant is discharged to the outside of the case 10 through the discharge path 3. The discharge port 14 constitutes a part of the discharge path 3.

[0027] The compression mechanism 20 is housed in the case 10. In the present embodiment, the compression mechanism 20 is mainly disposed inside the second case 12. The compression mechanism 20 is arranged horizontally alongside the electric motor 30. The compression mechanism 20 is capable of drawing in and compressing the refrigerant that has been drawn in through the suction path 2 and passed through the electric motor 30, and discharging the compressed refrigerant from the discharge path 3. The members constituting the compression mechanism 20 are made of a material such as an aluminum alloy or an iron alloy, for example.

[0028] The compression mechanism 20 includes a rotary shaft 21, a piston, a vane, a cylinder, and a plate member 25. The piston is rotatable eccentrically with respect to an axis C as the rotary shaft 21 rotates. The vane abuts against the piston in a direction intersecting the first direction. The cylinder houses the piston and the vane, and a compression chamber for compressing the refrigerant is formed between the piston and the vane. The plate member 25 abuts against the cylinder in the first direction and is in contact with the compression chamber.

[0029] The piston in this embodiment includes a first piston and a second piston spaced apart from each other in the first direction. The vane in this embodiment includes a first vane and a second vane. The cylinder in this embodiment includes a first cylinder and a second cylinder. The compression chamber includes a first compression chamber and a second compression chamber.

[0030] The electric motor 30 is housed in the case 10. In this embodiment, the electric motor 30 is housed in a first case 11.

[0031] The electric motor 30 includes a stator 31 and a rotor 32. The stator 31 is formed by stacking a plurality of electromagnetic steel plates (not shown) in the Z direction. The stator 31 is fixed to the inner circumferential surface 15 of the first case 11. The rotor 32 is formed by stacking a plurality of electromagnetic steel plates (not shown) in the Z direction. The rotor 32 is disposed on the inner circumferential side of the stator 31 with a gap therebetween.

[0032] The oil separator 40 is provided on the discharge path 3. The oil separator 40 is provided on the discharge path 3 adjacent to the discharge port 14. The refrigerant contains lubricating oil (not shown) to maintain the sliding properties of the compression mechanism 20. The oil separator 40 separates the lubricating oil mixed in the refrigerant from the refrigerant.

[0033] Next, a detailed description will be given of the compression mechanism 20. Fig. 4 is a cross-sectional view of the rolling piston type electric compressor shown in Fig. 3, taken along line IV-IV.

[0034] 3 and 4 , the compression mechanism 20 includes a rotary shaft 21, a first compression section 22, a second compression section 23, and a plate member 25. In the present embodiment, the plate member 25 has a front side plate 140, a middle side plate 160, and a rear side plate 190.

[0035] The rotating shaft 21 is driven by an electric motor 30. The rotating shaft 21 has an axis C extending in a first direction (Z direction). Because the first direction (Z direction) is horizontal, the rolling piston type electric compressor 1 in this embodiment is a horizontally placed compressor whose horizontal width is greater than its vertical height. Note that the axis C of the rotating shaft 21 is not limited to extending horizontally.

[0036] The rotating shaft 21 has a fixed portion 110 , a first shaft portion 111 , a second shaft portion 112 , a third shaft portion 113 , a first eccentric shaft portion 114 , and a second eccentric shaft portion 115 .

[0037] The fixed portion 110 is fixed to the inner peripheral surface 33 of the rotor 32. As a result, when the electric motor 30 is driven, the rotation of the rotor 32 causes the rotation shaft 21 to rotate about the axis C.

[0038] The first shaft 111 is inserted through the front side plate 140. The second shaft 112 is inserted through the rear side plate 190. The third shaft 113 is inserted through the middle side plate 160.

[0039] Each of the first eccentric shaft portion 114 and the second eccentric shaft portion 115 is eccentric in a direction perpendicular to the first direction (Z direction) with respect to the axis C of the rotating shaft 21. The first eccentric shaft portion 114 is inserted through the first compression portion 22. The second eccentric shaft portion 115 is inserted through the second compression portion 23.

[0040] As shown in FIG. 4 , the first compression section 22 includes a first piston 120 , a first vane 122 , and a first cylinder 125 .

[0041] The first piston 120 is rotatable in an eccentric state with respect to the axis C in accordance with the rotation of the rotary shaft 21. The first piston 120 is fitted to the first eccentric shaft portion 114 in a state in which it can rotate circumferentially in the first direction (Z direction).

[0042] The first vane 122 abuts against the first piston 120 in a direction (Y direction) intersecting the first direction. A tip end 123 of the first vane 122 abuts against the outer circumferential surface 121 of the first piston 120 in the direction (Y direction) intersecting the first direction. The first vane 122 is movable in the Y direction while abutting against the first piston 120 in accordance with the rotation of the first piston 120.

[0043] The first cylinder 125 accommodates the first piston 120 and the first vane 122. The first piston 120, which rotates eccentrically, slides on an inner circumferential surface 126 of the first cylinder 125. A vane groove 127 is provided so as to be continuous with the inner circumferential surface 126. The vane groove 127 extends in the Y direction. The first vane 122 is accommodated in the vane groove 127. The side surface 124 of the first vane 122 is provided so as to slide in the vane groove 127.

[0044] A through-hole 128 is provided in the outer peripheral surface of the first cylinder 125. The through-hole 128 penetrates to the first vane 122 in the vertical direction (Y direction) perpendicular to the first direction. An elastic member 129 is inserted into the through-hole 128. The elastic member 129 biases the first vane 122 toward the first piston 120. A plate-shaped member 130 and a fastening member 131 are provided on the outer peripheral surface of the first cylinder 125. The plate-shaped member 130 is disposed with a gap from the through-hole 128. The plate-shaped member 130 supports the elastic member 129. The fastening member 131 fixes the plate-shaped member 130 to the first cylinder 125.

[0045] The first cylinder 125 defines a first compression chamber 26 between the first piston 120 and the first vane 122 for compressing the refrigerant.

[0046] Refrigerant is introduced into the first compression chamber 26 through a first suction port 143 (described later). As the first piston 120 rotates in an eccentric state, the space in the first compression chamber 26 gradually narrows, compressing the refrigerant. The compressed refrigerant is discharged from a first discharge port 164 (described later).

[0047] As shown in FIG. 3 , the second compression section 23 includes a second piston 150 , a second vane 151 , and a second cylinder 152 .

[0048] The second piston 150 is disposed at an interval from the first piston 120 on the opposite side of the first piston 120 from the side on which the front side plate 140 is disposed in the first direction (Z direction). The second piston 150 is rotatable in an eccentric state with respect to the axis C in conjunction with the rotation of the rotary shaft 21. The second piston 150 is fitted to the second eccentric shaft portion 115 in a state in which it is rotatable about its own axis in the circumferential direction in the first direction (Z direction).

[0049] The second vane 151 abuts against the second piston 150 in a direction (Y direction) intersecting the first direction. The second cylinder 152 accommodates the second piston 150 and the second vane 151.

[0050] In the second compression section 23, a second compression chamber 27 for compressing the refrigerant is formed between the second vane 151, the second cylinder 152 and the second piston 150.

[0051] Refrigerant is introduced into the second compression chamber 27 through a second intake port 180 (described later). As the second piston 150 rotates eccentrically, the space in the second compression chamber 27 gradually narrows, compressing the refrigerant. The compressed refrigerant is discharged through a second discharge port 192 (described later).

[0052] The front side plate 140 abuts against the first cylinder 125 in the first direction (Z direction). In this embodiment, the front side plate 140 abuts against the first cylinder 125 from the side where the electric motor 30 is disposed. The front side plate 140 abuts against the first compression chamber 26 in the first direction (Z direction).

[0053] The front side plate 140 has an outer periphery 141 and a first bearing 142. The outer periphery 141 is a portion that is sandwiched between the first case 11 and the second case 12 in the first direction (Z direction). The front side plate 140 is connected to the first case 11 and the second case 12 at the outer periphery 141 by bolts or the like. The first bearing 142 is formed by a through hole that penetrates the front side plate 140 in the first direction (Z direction). The first bearing 142 supports the first shaft 111. The first shaft 111 slides relative to the first bearing 142 as the rotating shaft 21 rotates.

[0054] The front side plate 140 abuts against the inner peripheral surface 15 of the case 10 in a direction intersecting the first direction (Z direction). Specifically, the front side plate 140 abuts against the entire periphery of the inner peripheral surface 15 of the case 10 in an XY plane perpendicular to the first direction (Z direction).

[0055] The middle side plate 160 is disposed between the first cylinder 125 and the second cylinder 152 in the first direction (Z direction). The middle side plate 160 separates the first compression chamber 26 and the second compression chamber 27.

[0056] The middle side plate 160 has a first member 161 and a second member 178 .

[0057] The first member 161 has a disk shape extending in a direction intersecting the first direction. The first member 161 abuts against the first cylinder 125 in the first direction (Z direction). The third shaft portion 113 of the rotating shaft 21 is inserted into an inner circumferential surface 162 of the first member 161. The third shaft portion 113 slides relative to the inner circumferential surface 162 as the rotating shaft 21 rotates.

[0058] The second member 178 has a disk shape extending in a direction intersecting the first direction. The second member 178 abuts against the second cylinder 152 and the first member 161 in the first direction (Z direction). The third shaft portion 113 of the rotating shaft 21 is inserted into an inner circumferential surface 179 of the second member 178. The third shaft portion 113 slides relative to the inner circumferential surface 179 as the rotating shaft 21 rotates.

[0059] The middle side plate 160 abuts against the inner peripheral surface 15 of the case 10 in a direction intersecting the first direction (Z direction). Specifically, the middle side plate 160 abuts against the entire circumference of the inner peripheral surface 15 of the case 10 in an XY plane perpendicular to the first direction (Z direction). In the present embodiment, the first member 161 abuts against the entire circumference of the inner peripheral surface 15 of the case 10 in the XY plane perpendicular to the first direction (Z direction).

[0060] The rear side plate 190 abuts against the second cylinder 152 from the side opposite to the side on which the front side plate 140 is disposed in the first direction (Z direction). The rear side plate 190 abuts against the second compression chamber 27 in the first direction (Z direction). The rear side plate 190 is disposed opposite the front side plate 140 in the first direction (Z direction), with the first compression chamber 26 and the second compression chamber 27 sandwiched therebetween.

[0061] The rear side plate 190 has a second bearing portion 191. The second bearing portion 191 is formed by a through-hole that penetrates the rear side plate 190 in the first direction (Z direction). The second bearing portion 191 supports the second shaft portion 112. The second shaft portion 112 slides relative to the second bearing portion 191 as the rotary shaft 21 rotates.

[0062] Next, a description will be given of the refrigerant path in the rolling piston electric compressor 1. Fig. 5 is an exploded perspective view showing the path through which the refrigerant is compressed in the rolling piston electric compressor according to one embodiment of the present disclosure. Note that for the sake of convenience, Fig. 5 shows only the components necessary for the explanation, and omits other components (such as through holes for supplying lubricating oil).

[0063] As shown in FIG. 5 , the suction path 2 and the discharge path 3 through which the refrigerant passes are provided to pass through the front side plate 140, the first cylinder 125, the middle side plate 160, the second cylinder 152, and the rear side plate 190.

[0064] A first intake port 143 is provided in the front side plate 140. The first intake port 143 penetrates the front side plate 140 in a first direction (Z direction). The first intake port 143 has an elongated hole shape in a direction perpendicular to the first direction (Z direction).

[0065] The first cylinder 125 is provided with a communication hole 132. The communication hole 132 passes through the first cylinder 125 in the first direction (Z direction).

[0066] A communication hole 170 is provided in the first member 161 of the middle side plate 160. The communication hole 170 penetrates the first member 161 in the first direction (Z direction).

[0067] The first member 161 is provided with a first discharge port 164. The first discharge port 164 penetrates the first member 161 in the first direction (Z direction). A first groove 163 is provided in the end face of the first member 161 on the side that abuts against the second member 178. The first groove 163 is recessed in the first direction (Z direction). The first discharge port 164 is connected to the bottom of the first groove 163. The first discharge port 164 is in communication with the first compression chamber 26. The first discharge port 164 discharges the refrigerant compressed between the first member 161 and the second member 178. In the present embodiment, the refrigerant compressed is discharged into the internal space of the first groove 163.

[0068] A discharge valve 165 is provided in the first discharge port 164. The first discharge port 164 is opened and closed by the discharge valve 165. A gap 169 communicating with the first groove 163 is provided in an outer peripheral surface 168 of the first member 161. The refrigerant discharged from the first discharge port 164 can be discharged from the gap 169 in a direction perpendicular to the first direction (Z direction).

[0069] A second intake port 180 is provided in the second member 178 of the middle side plate 160. The second intake port 180 penetrates the second member 178 in the first direction (Z direction).

[0070] A second discharge port 192 is provided in the rear side plate 190. The second discharge port 192 penetrates the rear side plate 190 in the first direction (Z direction). The second discharge port 192 is opened and closed by a discharge valve 193.

[0071] The suction path 2 is composed of a path through which the refrigerant flows from the suction port 13 of the case 10 to the first suction port 143, and a path through which the refrigerant flows from the first suction port 143 in the compression mechanism 20 to the first compression chamber 26 and the second compression chamber 27.

[0072] The discharge path 3 is composed of a path through which refrigerant flows from the first compression chamber 26 in the compression mechanism 20 to the first discharge port 164, a path through which refrigerant flows from the second compression chamber 27 to the second discharge port 192, and a path through which refrigerant flows from the first discharge port 164 and the second discharge port 192 to the oil separator 40.

[0073] The suction path 2 includes a first suction path 4 and a second suction path 5. The discharge path 3 includes a first discharge path 6 and a second discharge path 7.

[0074] The first suction path 4 is a path that introduces refrigerant into the first compression chamber 26. The first suction path 4 introduces refrigerant that has flowed into the inside of the case 10 from the suction port 13 into the first compression chamber 26 via the first suction port 143. The first discharge path 6 is a path that discharges refrigerant compressed in the first compression chamber 26. The first discharge path 6 passes through a first discharge port 164 and a gap 169 and is connected to a first communication hole 16 of the case 10, which will be described later. The first discharge path 6 connects the first compression chamber 26 and the oil separator 40.

[0075] The second suction path 5 is a path that introduces refrigerant into the second compression chamber 27. The second suction path 5 branches off from the first suction path 4 at the first suction port 143. The second suction path 5 introduces refrigerant into the second compression chamber 27 via the first suction port 143, the communication holes 132 and 170, and the second suction port 180.

[0076] The second discharge path 7 is a path that discharges the refrigerant compressed in the second compression chamber 27. The second discharge path 7 passes through the second discharge port 192 and is connected to the first communication hole 16 of the case 10. The second discharge path 7 connects the second compression chamber 27 and the oil separator 40.

[0077] The suction path 2 and the discharge path 3 described above create a pressure difference in the refrigerant inside the case 10. As shown in Fig. 3, a suction pressure region 2A where the suctioned refrigerant exists is defined in a portion of the interior of the case 10. Also, a discharge pressure region 3A where the refrigerant discharged from the compression chamber exists is defined in a portion of the interior of the case 10.

[0078] The suction pressure region 2A is an internal space of the case 10 including a path through which the refrigerant flows from the suction port 13 of the case 10 to the first suction port 143 of the front side plate 140. The suction pressure region 2A is in communication with the suction path 2.

[0079] The discharge pressure region 3A is the space between the inner circumferential surface 15 of the case 10 and the outer circumferential surface of the compression mechanism 20, excluding the oil reservoir 28. The discharge pressure region 3A includes a part of the path through which the refrigerant flows from the first discharge port 164 and the second discharge port 192 to the oil separator 40. The discharge pressure region 3A is in communication with the discharge path 3.

[0080] Front side plate 140 divides suction pressure region 2A and discharge pressure region 3A so that they are aligned in the first direction (Z direction). Front side plate 140 is configured to withstand the pressure of oil reservoir chamber 28 and the pressure of discharge pressure region 3A. Therefore, front side plate 140 is thicker than rear side plate 190 in the first direction (Z direction).

[0081] Specifically, the front side plate 140 has a thickness T1 in a portion other than the outer circumferential portion 141 and the first bearing portion 142. The thickness T1 is the thickness between one end face and the other end face of the front side plate 140 at a position aligned with the cylinder in the first direction (Z direction). The rear side plate 190 has a thickness T2 in a portion other than the second bearing portion 191. The thickness T2 is the minimum thickness of the rear side plate 190. The thickness T1 of the front side plate 140 is greater than the thickness T2 of the rear side plate 190.

[0082] An oil reservoir 28 capable of storing lubricating oil is formed inside the case 10. Details of the oil reservoir 28 will be described later.

[0083] FIG. 6 is a cross-sectional view of the rolling piston type electric compressor of FIG. 1, seen from the direction of the arrows along line VI-VI.

[0084] As shown in Figure 6, a first communication hole 16 and an inner diameter portion 19 are provided in a thick portion of the case 10. The first communication hole 16 connects the discharge pressure region 3A with the inner diameter portion 19. The inner diameter portion 19 extends in the Y direction. The inner diameter portion 19 constitutes a part of the discharge path 3.

[0085] The oil separator 40 is in communication with the discharge pressure region 3A via the first communication hole 16 and the inner diameter portion 19. The oil separator 40 has a cylindrical portion 41. The cylindrical portion 41 is disposed inside the inner diameter portion 19. The cylindrical portion 41 is disposed opposite the direction in which the refrigerant is discharged from the first communication hole 16.

[0086] When the refrigerant mixed with lubricating oil is discharged onto the outer peripheral surface of cylindrical portion 41, the momentum of the discharge causes the refrigerant mixed with lubricating oil to circulate between the outer peripheral surface of cylindrical portion 41 and inner diameter portion 19, and the lubricating oil is centrifuged from the refrigerant. The refrigerant is discharged from discharge port 14 to the outside of rolling piston type electric compressor 1. Meanwhile, the lubricating oil moves downward in the Y direction (direction DR1 in FIG. 6 ) along inner diameter portion 19.

[0087] Next, the lubricating oil supply path in the rolling piston electric compressor 1 will be described. Fig. 7 is an exploded perspective view showing the lubricating oil supply path in a rolling piston electric compressor according to one embodiment of the present disclosure. Fig. 8 is a partial cross-sectional view of the configuration of the rolling piston electric compressor in Fig. 1 as viewed from the direction of the arrows VIII-VIII. Note that for the sake of convenience, Fig. 7 shows only the configuration necessary for explanation, and omits the depiction of other configurations (such as the suction path or the discharge path).

[0088] As shown in FIGS. 7 and 8 , the lubricating oil supply path 8 through which the lubricating oil separated from the oil separator 40 flows is formed to pass through the case 10 and the compression mechanism 20 .

[0089] The lubricating oil supply path 8 includes a first supply path 50 and a second supply path 60. The first supply path 50 branches off from the discharge path 3. The first supply path 50 is capable of supplying the lubricating oil separated from the oil separator 40 to the oil reservoir 28. The second supply path 60 is supplied with the lubricating oil from the oil reservoir 28 and is capable of supplying the lubricating oil to sliding positions of the compression mechanism 20.

[0090] 8, a second communication hole 17 that communicates with the inner diameter portion 19 is provided in the case 10. The second communication hole 17 extends in the first direction (Z direction).

[0091] 7 and 8 , a first oil feed hole 196 is provided in the rear side plate 190. The first oil feed hole 196 penetrates the rear side plate 190 in the first direction (Z direction). Similar to the first oil feed hole 196, first oil feed holes 153, 181, 171, and 133 are provided in the second cylinder 152, the second member 178, the first member 161, and the first cylinder 125. The front side plate 140 is provided with an oil feed groove 144. The oil feed groove 144 is provided in the end surface of the front side plate 140 that abuts against the first cylinder. The oil feed groove 144 extends in the Y direction.

[0092] The first supply path 50 is made up of the second communication hole 17, the first oil supply holes 196, 153, 181, 171, 133, and the oil supply groove 144. The first supply path 50 supplies the lubricating oil separated by the oil separator 40 to the oil reservoir 28 (in the direction DR2 in FIG. 8 ).

[0093] The first supply path 50 directly connects the second communication hole 17 of the case 10 with the first oil supply holes 196, 153, 181, 171, and 133 of the compression mechanism 20. There is no need to provide a dedicated part for supplying lubricating oil in the path for supplying lubricating oil to the oil reservoir 28. This makes it possible to configure a less expensive rolling piston type electric compressor 1 compared to a case in which a dedicated part for supplying lubricating oil is separately provided.

[0094] An oil reservoir 28 is formed surrounded by the case 10, the first cylinder 125, the front side plate 140, and the middle side plate 160. In this embodiment, the oil reservoir 28 is formed in the space sandwiched between the case 10, the first cylinder 125, the front side plate 140, and the first member 161.

[0095] Oil reservoir 28 is formed in an area including the bottom side of inner circumferential surface 15 of case 10. Lubricating oil enters the vane grooves from through-holes provided in the cylinders (for example, through-hole 128 provided in first cylinder 125 in this embodiment). This prevents the vanes from being immersed in lubricating oil, which would otherwise cause a deterioration in the sliding characteristics of the vanes. The size and shape of oil reservoir 28 are set within a range that allows it to store the amount of lubricating oil to be supplied to the sliding parts of compression mechanism 20.

[0096] If the oil reservoir were to be formed between the front side plate 140 and the rear side plate 190, it would be necessary to provide a partition wall or the like in the second member 178 and the second cylinder in order to separate the lubricating oil from the refrigerant discharged from the first compression chamber 26. Providing a partition wall would result in the second member 178 and the second cylinder having complex shapes, which could increase processing costs.

[0097] On the other hand, in this embodiment, the second member 178 and the second cylinder 152 do not have a partition portion, and the oil storage chamber 28 is formed only in the space sandwiched between the case 10, the first cylinder 125, the front side plate 140, and the middle side plate 160, so that a rolling piston type electric compressor 1 with a reduced cost and low-cost configuration can be provided.

[0098] Furthermore, in this embodiment, the oil reservoir chamber 28 is formed only in the space sandwiched between the case 10, the first cylinder 125, the front side plate 140, and the middle side plate 160, so the cross-sectional area of ​​the oil reservoir chamber 28 when viewed from the Y direction is smaller than when the oil reservoir chamber is formed in the entire lower part of the case 10. This makes it easier to ensure the oil level of the lubricating oil in the oil reservoir chamber 28, making it easier for the vanes to be immersed in the lubricating oil and ensuring the slidability of the vanes.

[0099] FIG. 9 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3 as viewed from the direction of the arrows along line IX-IX.

[0100] 7 and 9, the second supply path 60 is provided with a first throttling portion 145A and a second throttling portion 146A. In the present embodiment, the first throttling portion 145A and the second throttling portion 146A are provided on the front side plate 140. The first throttling portion 145A and the second throttling portion 146A are in communication with the oil reservoir chamber 28. In the present embodiment, the first throttling portion 145A and the second throttling portion 146A have a slit shape.

[0101] Lubricating oil is supplied from the oil reservoir 28 to sliding parts of the compression mechanism 20 via the first throttle portion 145A and the second throttle portion 146A.

[0102] Fig. 10 is a cross-sectional view of the rolling piston type electric compressor of Fig. 1, seen from the direction of the arrows along line X-X. Fig. 11 is a cross-sectional view of the lubricating oil supply path, enlarging part XI in Fig. 10.

[0103] 7, 10, and 11, a first passage 147 is provided in the front side plate 140. The first passage 147 constitutes a part of the second supply passage 60. The first passage 147 connects the first throttle portion 145A and the first bearing portion 142.

[0104] The second supply path 60 is configured to be able to supply lubricating oil to the sliding portion between the front side plate 140 and the rotary shaft 21. In the present embodiment, the second supply path 60 is configured to be able to supply lubricating oil from the oil reservoir 28 via the first throttle portion 145A and the first path 147 to the sliding portion between the first bearing 142 and the first shaft portion 111.

[0105] The first throttle section 145A reduces the cross-sectional area of ​​the flow path of the lubricating oil in the middle of the second supply path 60. Therefore, excessive supply of lubricating oil to the path of the second supply path 60 after the first throttle section 145A is suppressed.

[0106] Fig. 12 is a partial cross-sectional view of the rolling piston type electric compressor of Fig. 1, as seen from the direction of the arrows along line XII-XII. Fig. 13 is a cross-sectional view showing the configuration of the lubricating oil supply path by enlarging part XIII in Fig. 12.

[0107] As shown in Figures 7, 12, and 13, the first cylinder 125 is provided with a second oil supply hole 134. The first member 161 is provided with a second oil supply hole 172. The second member 178 is provided with a second oil supply hole 182. The second cylinder 152 is provided with a second oil supply hole 154. The rear side plate 190 is provided with a second passage 197. The second passage 197 is connected to the second bearing portion 191.

[0108] Second supply path 60 is configured to be able to supply lubricating oil to a sliding portion between rear side plate 190 and rotating shaft 21. In the present embodiment, lubricating oil is able to be supplied from oil reservoir 28 to a sliding portion between second bearing 191 and second shaft 112 via second throttle portion 146A, second oil supply holes 134, 172, 182, 154, and second path 197.

[0109] The second throttle section 146A reduces the cross-sectional area of ​​the lubricating oil flow path in the middle of the second supply path 60. Therefore, excessive supply of lubricating oil to the second supply path 60 after the second throttle section 146A is suppressed.

[0110] FIG. 14 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3 as viewed from the direction of the arrows along line XIV-XIV.

[0111] As shown in Figures 7 and 14, the first member 161 is provided with a third passage 173 and a fourth passage 174. The third passage 173 has a groove shape extending in a direction perpendicular to the first direction (Z direction). The third passage 173 is connected to the second oil supply hole 172. The third passage 173 extends to the inner circumferential surface 162. The fourth passage 174 is provided midway along the third passage 173. The fourth passage 174 penetrates the first member 161 in the first direction (Z direction). The fourth passage 174 is in communication with the second oil supply hole 172 via the third passage 173.

[0112] A fourth passage 183 is also provided in the second member 178. The fourth passage 183 penetrates the second member 178 in the first direction (Z direction). The fourth passage 183 is in communication with the second oil supply hole 172 via the third passage 173.

[0113] The second supply path 60 is configured to be able to supply lubricating oil to a sealed portion between the rotating shaft 21 and the middle side plate 160. In the present embodiment, the lubricating oil is supplied between the first member 161 and the second member 178 and the third shaft portion 113 via a third path 173 of the middle side plate 160.

[0114] The second supply path 60 is configured to be able to supply lubricating oil to a sliding portion between the middle side plate 160 and at least one of the first piston 120 and the second piston 150. In the present embodiment, the second supply path 60 is configured to be able to supply lubricating oil to a sliding portion between the middle side plate 160 and the first piston 120 and the second piston 150. The lubricating oil is supplied between the middle side plate 160 and the end surface of the first piston 120 that contacts the middle side plate 160 via a fourth path 174 of the middle side plate 160. The lubricating oil is also supplied between the middle side plate 160 and the end surface of the second piston 150 that contacts the middle side plate 160 via a fourth path 183 of the middle side plate 160.

[0115] Figure 15 is a cross-sectional view of the rolling piston type electric compressor shown in Figure 3, as viewed from the direction of the arrows along line XV-XV. Figure 16 is a cross-sectional view of the rolling piston type electric compressor shown in Figure 3, as viewed from the direction of the arrows along line XVI-XVI.

[0116] As shown in Figures 7, 15, and 16, first cylinder 125 is provided with third oil supply hole 135. First member 161 is provided with third oil supply hole 175. Second member 178 is provided with third oil supply hole 184. Second cylinder 152 is provided with third oil supply hole 155.

[0117] A fifth passage 136 is provided in the first cylinder 125. The fifth passage 136 has a groove shape extending in a direction (X direction) perpendicular to the first direction. The fifth passage 136 is provided on both end surfaces of the first cylinder 125 in the first direction (Z direction). The fifth passage 136 communicates with the second oil supply hole 134 and the third oil supply hole 135.

[0118] A fifth passage 156 is provided in the second cylinder 152. The fifth passage 156 has a groove shape extending in a direction (X direction) perpendicular to the first direction. The fifth passage 156 is provided on both end surfaces of the second cylinder 152 in the first direction (Z direction). The fifth passage 156 communicates with the second oil supply hole 154 and the third oil supply hole 155.

[0119] Second supply path 60 is configured to be able to supply lubricating oil to a sliding portion between at least one of first vane 122 and second vane 151 and at least one of first cylinder 125 and second cylinder 152 corresponding to at least one of first vane 122 and second vane 151. In the present embodiment, second supply path 60 is configured to be able to supply lubricating oil to a sliding portion between first vane 122 and first cylinder 125, and a sliding portion between second vane 151 and second cylinder 152. Lubricating oil can be supplied between first vane 122 and vane groove 127 of first cylinder 125 via fifth path 136. Lubricating oil can also be supplied between second vane 151 and vane groove 127 of second cylinder 152 via fifth path 156. Since fifth path 136 is provided on both end surfaces of first cylinder 125 in the first direction (Z direction), lubricating oil can be supplied uniformly to the position where first vane 122 slides on first cylinder 125. Similarly to fifth path 136, fifth path 156 can also supply lubricating oil uniformly to the position where second vane 151 slides on second cylinder 152.

[0120] As shown in Fig. 4, the first vane 122 is disposed inside the case 10 on the lower side in the vertical direction (Y direction) perpendicular to the first direction. A hole is formed in the outer peripheral surface of the first cylinder 125, through which lubricating oil can be supplied from the oil reservoir 28 to the lower end side of the first vane 122. In this embodiment, this hole is a through hole 128. An elastic member 129 is inserted through the through hole 128 to bias the first vane 122, and the through hole 128 constitutes a part of the second lubricating oil supply path 60. The lubricating oil is supplied to the lower end side of the first vane 122 from the through hole 128.

[0121] It is desirable that the through-hole 128 extend downward in the vertical direction (Y direction) relative to the first vane 122. This allows the lubricating oil to be stored in the oil reservoir 28 from below in the vertical direction (Y direction), making it easier to introduce the lubricating oil into the through-hole 128. As a result, it becomes easier to supply the lubricating oil to the first vane 122, making it easier to maintain the lubrication of the first vane 122.

[0122] In rolling piston type electric compressor 1 according to one embodiment of the present disclosure, oil reservoir 28 is formed between case 10, first cylinder 125, front side plate 140, and middle side plate 160. This allows oil reservoir 28 to be isolated from discharge path 3, thereby preventing lubricating oil from being carried out of the compressor through discharge path 3. Furthermore, since oil reservoir 28 is formed between case 10, first cylinder 125, front side plate 140, and middle side plate 160, it is not necessary to supply lubricating oil by siphoning it up, as compared to when the entire internal space of case 10 is configured as an oil reservoir and lubricating oil is supplied to the compression mechanism by siphoning it up, and therefore lubricating oil can be reliably supplied to sliding parts of compression mechanism 20. Furthermore, by forming the oil reservoir chamber 28 surrounded by the case 10, the first cylinder 125, the front side plate 140, and the middle side plate 160, less processing is required to provide the oil reservoir chamber 28 than when the oil reservoir chamber is provided in a thick portion of the case, and therefore the rolling piston type electric compressor 1 can be constructed at low cost. As a result, it is possible to provide a rolling piston type electric compressor 1 that is constructed at low cost and has high reliability.

[0123] In the rolling piston type electric compressor 1 according to one embodiment of the present disclosure, by providing the lubricating oil supply path 8 in the case 10 and the compression mechanism 20, the number of parts can be reduced compared to when a dedicated part for supplying lubricating oil is separately provided, and therefore an inexpensive rolling piston type electric compressor 1 can be provided.

[0124] In the rolling piston type electric compressor 1 according to the embodiment of the present disclosure, by providing the lubricating oil supply path 8 in the case 10 and the compression mechanism 20, it is easier to configure the lubricating oil supply path shorter than when a dedicated component for supplying lubricating oil is separately provided. Therefore, by reducing the processing costs for configuring the lubricating oil supply path 8, it is possible to provide an inexpensive rolling piston type electric compressor 1.

[0125] In the rolling piston type electric compressor 1 according to the embodiment of the present disclosure, the first vane 122 is disposed inside the case 10 on the lower side in the vertical direction (Y direction) perpendicular to the first direction, and the outer peripheral surface of the first cylinder 125 is formed with a through-hole 128 that allows lubricating oil to be supplied from the oil reservoir 28 to the lower end side of the first vane 122. This makes it easier to introduce the lubricating oil into the through-hole 128 when the lubricating oil is stored in the oil reservoir 28 from below in the vertical direction (Y direction). As a result, it is easier to supply the lubricating oil to the first vane 122, thereby improving the reliability of the sliding of the first vane 122.

[0126] In the rolling piston type electric compressor 1 according to one embodiment of the present disclosure, wear of the front side plate 140 and the rotating shaft 21 can be suppressed by supplying lubricating oil to the sliding points between the front side plate 140 and the rotating shaft 21.

[0127] In the rolling piston type electric compressor 1 according to one embodiment of the present disclosure, wear of the rear side plate 190 and the rotating shaft 21 can be suppressed by supplying lubricating oil to the sliding points between the rear side plate 190 and the rotating shaft 21.

[0128] In the rolling piston type electric compressor 1 according to one embodiment of the present disclosure, by supplying lubricating oil to the sliding points between the first vane 122 and the first cylinder 125 and the sliding points between the second vane 151 and the second cylinder 152, a path for supplying lubricating oil to the first vane 122 and the second vane 151 is secured, thereby improving the reliability of the sliding of the first vane 122 and the second vane 151.

[0129] In the rolling piston type electric compressor 1 according to one embodiment of the present disclosure, by supplying lubricating oil to the sliding points between the middle side plate 160 and the first piston 120 and the second piston 150, wear on the end faces of the first piston 120 and the second piston 150 in the first direction (Z direction) can be suppressed.

[0130] In the rolling piston type electric compressor 1 according to one embodiment of the present disclosure, by supplying lubricating oil to the sealed area between the rotating shaft 21 and the middle side plate 160, it is possible to prevent refrigerant from leaking from the first compression chamber 26 and the second compression chamber 27 through the gap between the rotating shaft 21 and the middle side plate 160.

[0131] In the rolling piston type electric compressor 1 according to one embodiment of the present disclosure, the first throttling section 145A and the second throttling section 146A, in which the cross-sectional area of ​​the flow path of the lubricating oil is reduced, are provided in the middle of the second supply path 60, thereby adjusting the amount of lubricating oil in the second supply path 60 and preventing excessive supply of lubricating oil that would cause sliding resistance.

[0132] The rolling piston type electric compressor according to the present disclosure may be configured to include a two-stage compression mechanism in which refrigerant compressed by a first compression section is supplied to a second compression section and further compressed.

[0133] [Additional Note] This embodiment includes the following disclosure.

[0134] [Configuration 1] A compression mechanism is provided in the case, the compression mechanism being arranged in parallel with the electric motor in a horizontal direction, and configured to suck in refrigerant that has been sucked in through the suction path and passed through the electric motor, compress the refrigerant, and discharge the refrigerant to the discharge path. An oil separator is provided on the discharge path and separates lubricating oil mixed in the refrigerant from the refrigerant. The compression mechanism comprises: a rotary shaft driven by the electric motor and having an axis extending in a first direction; a first piston that is rotatable eccentrically with respect to the axis as the rotary shaft rotates; a first vane that abuts against the first piston in a direction intersecting the first direction; a first cylinder that accommodates the first piston and the first vane and defines a first compression chamber that compresses the refrigerant between the first piston and the first vane; and a front side plate that abuts against the first cylinder in the first direction and is in contact with the first compression chamber. the second cylinder includes a second piston spaced from the first piston and arranged on an opposite side of the first piston in the first direction from a side on which the front side plate is arranged, the second piston being rotatable eccentrically with respect to the axis as the rotary shaft rotates; a second vane abutting the second piston in a direction intersecting the first direction; a second cylinder that houses the second piston and the second vane and defines a second compression chamber that compresses refrigerant between the second piston and the second vane; a rear side plate abutting the second cylinder from an opposite side of the first direction from a side on which the front side plate is arranged and in contact with the second compression chamber; and a middle side plate that is arranged between the first cylinder and the second cylinder in the first direction and separates the first compression chamber from the second compression chamber, the front side plate and the middle side plate each abutting an inner circumferential surface of the case in the direction intersecting the first direction, and an oil storage chamber is defined that is surrounded by the case, the first cylinder, the front side plate, and the middle side plate,a first supply path is formed that branches off from the discharge path and is capable of supplying the lubricating oil separated in the oil separator to the oil reservoir; and a second supply path is formed that receives the lubricating oil from the oil reservoir and is capable of supplying the lubricating oil to a sliding position of the compression mechanism.

[0135] [Configuration 2] The rolling piston type electric compressor according to Configuration 1, wherein the first vane is disposed inside the case on a lower side in a vertical direction intersecting the first direction, and a hole is formed in an outer peripheral surface of the first cylinder so that lubricating oil can be supplied from the oil reservoir to a lower end side of the first vane.

[0136] [Configuration 3] The rolling piston type electric compressor according to Configuration 1 or 2, wherein the second supply path is configured to be able to supply lubricating oil to a sliding portion between the front side plate and the rotary shaft.

[0137] [Configuration 4] The rolling piston type electric compressor according to any one of Configurations 1 to 3, wherein the second supply path is configured to be able to supply lubricating oil to a sliding portion between the rear side plate and the rotating shaft.

[0138] [Configuration 5] The rolling piston type electric compressor according to any one of Configurations 1 to 4, wherein the second supply path is configured to be able to supply lubricating oil to a sliding portion between at least one of the first vane and the second vane and at least one of the first cylinder and the second cylinder corresponding to the at least one of the first vane and the second vane.

[0139] [Configuration 6] The rolling piston type electric compressor according to any one of Configurations 1 to 5, wherein the second supply path is configured to be able to supply lubricating oil to a sliding portion between the middle side plate and at least one of the first piston and the second piston.

[0140] [Configuration 7] The rolling piston type electric compressor according to any one of Configurations 1 to 6, wherein the second supply path is configured to be able to supply lubricating oil to a sealed portion between the rotating shaft and the middle side plate.

[0141] [Configuration 8] The rolling piston type electric compressor according to any one of Configurations 1 to 7, wherein a throttle portion in which a cross-sectional area of ​​a flow path for the lubricating oil is reduced is provided midway along the second supply path.

[0142] It should be noted that the above-described embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present disclosure should not be interpreted solely by the above-described embodiments. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. In the description of the above-described embodiments, combinable configurations may be combined with each other.

[0143] DESCRIPTION OF SYMBOLS 1 Rolling piston type electric compressor 2 Suction path 2A Suction pressure region 3 Discharge path 3A Discharge pressure region 4 First suction path 5 Second suction path 6 First discharge path 7 Second discharge path 8 Lubricating oil supply path 10 Case 11 First case 12 Second case 13 Suction port 14 Discharge port 15 Inner peripheral surface 16 First communication hole 17 Second communication hole 19 Inner diameter portion 20 Compression mechanism 21 Rotating shaft 22 First compression section 23 Second compression section 25 Plate member 26 First compression chamber 27 Second compression chamber 28 Oil storage chamber 30 Electric motor 31 Stator 32 Rotor 33 Inner peripheral surface 40 Oil separator 41 Cylindrical portion 50 First supply path 60 Second supply path 110 Fixed portion 111 First shaft portion 112 Second shaft portion 113 Third shaft portion 114 First eccentric shaft portion 115 Second eccentric shaft portion 120 First piston 121, 168 Outer peripheral surface 122 First vane 123 Tip portion 124 Side portion 125 First cylinder 126, 162, 179 Inner peripheral surface 127 Vane groove 128 Through hole 129 Elastic member 130 Plate-shaped member 131 Fastening member 132, 170 Communication hole 133, 153, 171, 181, 196 First oil supply hole 134, 154, 172, 182 Second oil supply hole 135, 155, 175, 184 Third oil supply hole 136, 156 Fifth path 140 Front side plate 141 Outer peripheral portion 142 First bearing portion 143 First intake port 144 Oil supply groove 145A First throttle portion 146A Second throttle portion 147 First path 150 Second piston 151 Second vane 152 Second cylinder 160 Middle side plate 161 First member 163 First groove 164 First discharge port 165, 193 Discharge valve 169 Gap 173 Third path 174,183 Fourth passage 178 Second member 180 Second intake port 190 Rear side plate 191 Second bearing portion 192 Second discharge port 197 Second passage C Axis center

Claims

1. A compressor comprising: a case having a suction path and a discharge path; an electric motor housed in the case; a compression mechanism housed in the case and arranged horizontally alongside the electric motor, which sucks in refrigerant that has been sucked in through the suction path and passed through the electric motor, compresses it, and discharges it to the discharge path; and an oil separator located on the discharge path and separates lubricating oil mixed in the refrigerant from the refrigerant, wherein the compression mechanism comprises: a rotating shaft driven by the electric motor and having an axis extending in a first direction; a first piston that is rotatable eccentrically with respect to the axis as the rotating shaft rotates; a first vane that abuts against the first piston in a direction intersecting the first direction; a first cylinder that houses the first piston and the first vane and defines a first compression chamber that compresses the refrigerant between the first piston and the first vane; and a front side plate that abuts against the first cylinder in the first direction and is in contact with the first compression chamber. the second cylinder includes a second piston spaced from the first piston and arranged on an opposite side of the first piston in the first direction from a side on which the front side plate is arranged, the second piston being rotatable eccentrically with respect to the axis as the rotary shaft rotates; a second vane abutting the second piston in a direction intersecting the first direction; a second cylinder that houses the second piston and the second vane and defines a second compression chamber that compresses refrigerant between the second piston and the second vane; a rear side plate abutting the second cylinder from an opposite side of the first direction from a side on which the front side plate is arranged and in contact with the second compression chamber; and a middle side plate that is arranged between the first cylinder and the second cylinder in the first direction and separates the first compression chamber from the second compression chamber, the front side plate and the middle side plate each abutting an inner circumferential surface of the case in the direction intersecting the first direction, and an oil storage chamber is defined that is surrounded by the case, the first cylinder, the front side plate, and the middle side plate,a first supply path is formed that branches off from the discharge path and is capable of supplying the lubricating oil separated in the oil separator to the oil reservoir; and a second supply path is formed that receives the lubricating oil from the oil reservoir and is capable of supplying the lubricating oil to a sliding position of the compression mechanism.

2. A rolling piston type electric compressor as described in claim 1, wherein the first vane is positioned inside the case on the lower side in a vertical direction intersecting the first direction, and the outer peripheral surface of the first cylinder is formed with a hole that can supply lubricating oil from the oil storage chamber to the lower end side of the first vane.

3. A rolling piston type electric compressor according to claim 1 or 2, wherein the second supply path is configured to be able to supply lubricating oil to the sliding portion between the front side plate and the rotating shaft.

4. A rolling piston type electric compressor according to claim 1 or 2, wherein the second supply path is configured to be able to supply lubricating oil to the sliding portion between the rear side plate and the rotating shaft.

5. A rolling piston type electric compressor as described in claim 1 or claim 2, wherein the second supply path is configured to be able to supply lubricating oil to a sliding portion between at least one of the first vane and the second vane and at least one of the first cylinder and the second cylinder corresponding to said at least one of the first vane and the second vane.

6. A rolling piston type electric compressor as described in claim 1 or claim 2, wherein the second supply path is configured to be able to supply lubricating oil to the sliding points between the middle side plate and at least one of the first piston and the second piston.

7. A rolling piston type electric compressor according to claim 1 or 2, wherein the second supply path is configured to be able to supply lubricating oil to a sealed location between the rotating shaft and the middle side plate.

8. A rolling piston type electric compressor according to claim 1 or 2, wherein a throttle section in which the cross-sectional area of ​​the flow path for the lubricating oil is reduced is provided midway along the second supply path.

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