Rolling piston type electric compressor

Abstract

To provide a rolling piston type electric compressor constituted in low cost and having high reliability.SOLUTION: An oil storage chamber 28 surrounded by a case, a first cylinder 125, a second cylinder 152, a front side plate 140, a rear side plate 190, and a middle side plate 160 is formed. In each of the second cylinder 152 and the middle side plate 160, the oil storage chamber 28 and a first discharge passage 6 are isolated by parts 158, 186 of marginal portions thereof. A first supply passage is formed which diverges from a discharge passage 3 and can supply lubrication oil separated from an oil separator to an oil storage chamber 28. A second supply passage is formed to which the lubrication oil is supplied from the oil storage chamber 28 and which can supply the lubrication oil to a slide position of a compression mechanism.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[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 store 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 storage chamber is defined in the lower part of the cylindrical main housing to store lubricating oil separated by an oil separator. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-105985 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-198159 Summary of the Invention [Problem to be solved by the invention]

[0005] The horizontal rotary compressor described in Patent Document 1 has an oil storage chamber 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. For this reason, 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. [Means for solving the problem]

[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 that compresses 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 on which 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 that compresses 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 on which 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 rear side plate each abut against the inner peripheral surface of the case in a direction intersecting the first direction, and an oil storage chamber is formed surrounded by the case, the first cylinder, the second cylinder, the front side plate, the rear side plate, and the middle side plate.A first discharge passage connecting the first compression chamber and the oil separator is formed in the second cylinder, the rear side plate, and the middle side plate. In each of the second cylinder and the middle side plate, the oil reservoir chamber and the first discharge passage are isolated from each other by a portion of the periphery. A first supply passage is formed branching from the discharge passage and capable of supplying lubricating oil separated from the oil separator to the oil reservoir chamber. A second supply passage is formed to receive lubricating oil from the oil reservoir chamber and to supply lubricating oil to a sliding position of the compression mechanism.

[0009] In one embodiment of the present disclosure, at least one of the first vane and the second vane is disposed inside the case on the lower side in a vertical direction intersecting with the first direction. At least one of the first cylinder and the second cylinder corresponding to at least one of the first vane and the second vane has an outer peripheral surface formed with a hole that can supply lubricating oil from an oil reservoir to the lower end side of at least one of the first vane and the second 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 where the cross-sectional area of ​​the flow path of the lubricating oil is reduced is provided midway along the second supply path. [Effects of the Invention]

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

[0017] [Figure 1] 1 is a top view illustrating a configuration of a rolling piston type electric compressor according to an embodiment of the present disclosure. FIG. [Figure 2] 2 is a front view of the rolling piston type electric compressor of FIG. 1, as viewed from the direction of the arrow II. FIG. [Figure 3] 3 is a partial cross-sectional view of the rolling piston type electric compressor of FIG. 1, seen from the direction of the arrows along line III-III. [Figure 4] 4 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3, seen from the direction of the arrows along line IV-IV. [Figure 5] FIG. 1 is an exploded perspective view showing a path through which a refrigerant is compressed in a rolling piston type electric compressor according to an embodiment of the present disclosure. [Figure 6] 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. [Figure 7] FIG. 2 is an exploded perspective view showing a lubricating oil supply path in the rolling piston type electric compressor according to the embodiment of the present disclosure. [Figure 8] 8 is a partial cross-sectional view of the rolling piston type electric compressor of FIG. 1, as viewed from the direction of the arrows along line VIII-VIII. [Figure 9] 9 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3, seen from the direction of the arrows along line IX-IX. [Figure 10] 2 is a cross-sectional view of the rolling piston type electric compressor of FIG. 1, seen from the direction of the arrow XX. [Figure 11] 11 is an enlarged cross-sectional view of a portion XI in FIG. 10 showing the configuration of a lubricating oil supply path. FIG. [Figure 12] 1. FIG. 2 is a partial cross-sectional view of the rolling piston type electric compressor of FIG. 1, taken along the line XII-XII. [Figure 13] 13 is an enlarged cross-sectional view of a portion XIII in FIG. 12, showing the configuration of a lubricating oil supply path. [Figure 14] 14 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3, seen from the direction of the arrows along line XIV-XIV. [Figure 15] 4 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3, seen from the direction of the arrows along the line XV-XV. [Figure 16] 16 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3, seen from the direction of the arrows along line XVI-XVI. DETAILED DESCRIPTION OF THE INVENTION

[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 rotating 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 rotating 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 Figures 1 to 3, rolling piston type electric compressor 1 can be mounted on, for example, an automobile. Rolling piston type electric compressor 1 is used, for example, in automobile air conditioning. Rolling piston type electric compressor 1 in this embodiment is driven using, for example, carbon dioxide (CO2) 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 material of the case 10 is, for example, 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 peripheral surface 15. The second case 12 is provided with a discharge port 14 through which the refrigerant is discharged. The discharge port 14 is located in a thick portion at the end of the case 10 in the first direction (Z direction).

[0026] Case 10 is provided with suction path 2 and discharge path 3. Refrigerant is drawn into case 10 through suction path 2. Suction port 13 constitutes part of suction path 2. Refrigerant is discharged to the outside of case 10 through discharge path 3. Discharge port 14 constitutes part of 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 that compresses 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 a 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 a 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 of Fig. 3, as viewed from the direction of the arrows 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). Since 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 a configuration 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 has 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 around its own axis in the circumferential direction 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] In the first cylinder 125, a first compression chamber 26 is formed between the first piston 120 and the first vane 122, in which the refrigerant is compressed.

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

[0050] In second compression section 23, second vane 151, second cylinder 152, and second piston 150 form second compression chamber 27 for compressing refrigerant.

[0051] Refrigerant is introduced into second compression chamber 27 through second suction port 180, which will be described later. As second piston 150 rotates in an eccentric state, the space in second compression chamber 27 gradually narrows, compressing the refrigerant. The compressed refrigerant is discharged through second discharge port 192, which will be 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 portion 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 portion 142 is formed by a through hole that penetrates the front side plate 140 in the first direction (Z direction). The first bearing portion 142 supports the first shaft portion 111. The first shaft portion 111 slides relative to the first bearing portion 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 includes 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 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.

[0060] The rear side plate 190 has a second bearing portion 191. The second bearing portion 191 is configured as 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.

[0061] The rear side plate 190 abuts against the inner peripheral surface 15 of the case 10 in a direction perpendicular to the first direction (Z direction). Specifically, the rear side plate 190 abuts against the entire periphery of the inner peripheral surface 15 of the case 10 in the XY plane perpendicular to the first direction (Z direction).

[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 a rolling piston electric compressor according to one embodiment of the present disclosure. For the sake of convenience, Fig. 5 shows only the components necessary for the explanation, and omits the illustration of 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 communicates 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 this embodiment, the refrigerant compressed is discharged into the internal space of the first groove 163.

[0068] The first discharge port 164 is provided with a discharge valve 165. The first discharge port 164 is opened and closed by the discharge valve 165. The refrigerant discharged from the first discharge port 164 can be discharged from the first groove 163 toward the second member 178.

[0069] A second suction port 180 is provided in the second member 178 of the middle side plate 160. The second suction port 180 penetrates the second member 178 in the first direction (Z direction). A communication hole 185 is provided in the second member 178. The communication hole 185 penetrates the second member 178 in the first direction (Z direction).

[0070] The second cylinder 152 is provided with a communication hole 157. The communication hole 157 passes through the second cylinder 152 in the first direction (Z direction).

[0071] 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. A communication hole 198 is provided in the rear side plate 190. The communication hole 198 penetrates the rear side plate 190 in the first direction (Z direction).

[0072] 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.

[0073] The discharge path 3 is composed of a path through which the refrigerant flows from the first compression chamber 26 in the compression mechanism 20 to the first discharge port 164, a path through which the refrigerant flows from the second compression chamber 27 to the second discharge port 192, and a path through which the refrigerant flows from the first discharge port 164 and the second discharge port 192 to the oil separator 40.

[0074] 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 .

[0075] The first suction path 4 is a path that introduces the refrigerant into the first compression chamber 26. The first suction path 4 introduces the 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.

[0076] The first discharge path 6 is a path that discharges the refrigerant compressed in the first compression chamber 26. The first discharge path 6 is formed in the second cylinder 152, the rear side plate 190, and the middle side plate 160. The first discharge path 6 passes through a first discharge port 164 and communication holes 185, 157, and 198, 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.

[0077] The second suction path 5 is a path that introduces the 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 the 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.

[0078] 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.

[0079] The above-described suction path 2 and discharge path 3 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. A discharge pressure region 3A where the discharged refrigerant exists is defined in the remaining portion of the interior of the case 10.

[0080] The suction pressure region 2A is an internal space of the case 10 that includes 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 communicates with the suction path 2.

[0081] 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 chamber 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.

[0082] The front side plate 140 divides the suction pressure region 2A and the discharge pressure region 3A so that they are aligned in the first direction (Z direction). The front side plate 140 is configured to withstand the pressure in the oil reservoir chamber 28 and the discharge pressure region 3A. Therefore, the front side plate 140 is thicker than the rear side plate 190 in the first direction (Z direction).

[0083] 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.

[0084] 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.

[0085] 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.

[0086] As shown in Fig. 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 along the Y direction. The inner diameter portion 19 constitutes a part of the discharge path 3.

[0087] 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.

[0088] 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.

[0089] 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. For 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).

[0090] 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.

[0091] 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.

[0092] 8, a second communication hole 17 communicating with the inner diameter portion 19 is provided in the case 10. The second communication hole 17 extends in the first direction (Z direction).

[0093] As shown in Figures 7 and 8, a first oil supply hole 196 is provided in the rear side plate 190. The first oil supply hole 196 penetrates the rear side plate 190 in the first direction (Z direction). Like the first oil supply hole 196, first oil supply 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 supply groove 144. The oil supply groove 144 is provided in the end surface of the front side plate 140 that abuts against the first cylinder. The oil supply groove 144 extends in the Y direction.

[0094] 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 (direction DR2 in FIG. 8).

[0095] 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 that supplies 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.

[0096] An oil reservoir 28 is formed that is surrounded by the case 10, the first cylinder 125, the second cylinder 152, the front side plate 140, the rear side plate 190, and the middle side plate 160. In each of the second cylinder 152 and the middle side plate 160, the oil reservoir 28 and the first discharge path 6 are separated from each other by a portion of the periphery.

[0097] 5, in the second member 178 of the middle side plate 160, a portion 186 of the peripheral edge is located between the communication hole 185 and the outer peripheral surface. In the second member 178, the oil storage chamber 28 and the first discharge path 6 are separated from each other by the portion 186 of the peripheral edge.

[0098] In the second cylinder 152, a portion 158 of the peripheral edge is located between the communication hole 157 and the outer circumferential surface. In the second cylinder 152, the oil storage chamber 28 and the first discharge path 6 are isolated from each other by the portion 158 of the peripheral edge. The portions 158, 186 of the peripheral edges of the second cylinder 152 and the second member 178 are arranged side by side in the first direction (Z direction).

[0099] As shown in FIGS. 4 and 8, oil reservoir 28 is formed in a region 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 (in this embodiment, for example, through-hole 128 provided in first cylinder 125). This prevents the vanes from being immersed in lubricating oil, thereby preventing 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.

[0100] If the oil reservoir were to be formed in a thick portion of the case 10, complex machining of the thick portion of the case 10 would be necessary, which could increase machining costs.

[0101] On the other hand, in the present embodiment, the oil reservoir chamber 28 is formed such that the oil reservoir chamber 28 and the first discharge path 6 are isolated from each other by portions 158, 186 of the peripheral portions of the second cylinder 152 and the middle side plate 160, respectively, thereby reducing the cost of complexly processing the thick portions of the case 10. This makes it possible to provide an inexpensive rolling piston type electric compressor 1 with reduced processing costs.

[0102] Furthermore, because oil reservoir chamber 28 is formed only in the space surrounded by case 10, first cylinder 125, second cylinder 152, front side plate 140, rear side plate 190, and middle side plate 160, the cross-sectional area of ​​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 case 10. This makes it easier to ensure the oil level of the lubricating oil in oil reservoir chamber 28, making it easier for the vanes to be immersed in the lubricating oil and ensuring the slidability of the vanes.

[0103] 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.

[0104] 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.

[0105] Lubricating oil is supplied from oil reservoir 28 to sliding parts of compression mechanism 20 via first throttle portion 145A and second throttle portion 146A.

[0106] Fig. 10 is a cross-sectional view of the configuration of the rolling piston type electric compressor of Fig. 1, as seen from the direction of the arrow XX. Fig. 11 is a cross-sectional view showing the configuration of the lubricating oil supply path by enlarging part XI in Fig. 10.

[0107] 7, 10, and 11, a first path 147 is provided in the front side plate 140. The first path 147 constitutes a part of the second supply path 60. The first path 147 connects the first throttle portion 145A and the first bearing portion 142.

[0108] The second supply path 60 is configured to be able to supply lubricating oil to a 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 to a sliding portion between the first bearing 142 and the first shaft 111 via the first throttle portion 145A and the first path 147.

[0109] The first throttle section 145A reduces the cross-sectional area of ​​the flow path for 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.

[0110] 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 of an enlarged portion XIII in Fig. 12, showing the configuration of a lubricating oil supply path.

[0111] As shown in Figures 7, 12, and 13, first cylinder 125 is provided with second oil supply hole 134. First member 161 is provided with second oil supply hole 172. Second member 178 is provided with second oil supply hole 182. Second cylinder 152 is provided with second oil supply hole 154. Rear side plate 190 is provided with second path 197. Second path 197 is connected to second bearing portion 191.

[0112] 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 configured to be 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.

[0113] The second throttle section 146A 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 second throttle section 146A is suppressed.

[0114] 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.

[0115] As shown in FIGS. 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 communicates with the second oil supply hole 172 via the third passage 173.

[0116] 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 communicates with the second oil supply hole 172 via the third passage 173.

[0117] 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.

[0118] 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. Lubricating oil is supplied between the middle side plate 160 and the end face of the first piston 120 that contacts the middle side plate 160 via a fourth path 174 of the middle side plate 160. Lubricating oil is also supplied between the middle side plate 160 and the end face of the second piston 150 that contacts the middle side plate 160 via a fourth path 183 of the middle side plate 160.

[0119] Fig. 15 is a cross-sectional view of the rolling piston type electric compressor of Fig. 3, as seen from the direction of the arrows along line XV-XV. Fig. 16 is a cross-sectional view of the rolling piston type electric compressor of Fig. 3, as seen from the direction of the arrows along line XVI-XVI.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] The second supply path 60 is configured to be able to supply lubricating oil to a sliding portion between at least one of the first vane 122 and the second vane 151 and at least one of the first cylinder 125 and the second cylinder 152 corresponding to at least one of the first vane 122 and the second vane 151. In the present embodiment, the second supply path 60 is configured to be able to supply lubricating oil to a sliding portion between the first vane 122 and the first cylinder 125, and a sliding portion between the second vane 151 and the second cylinder 152. The lubricating oil can be supplied between the first vane 122 and the vane groove 127 of the first cylinder 125 via the fifth path 136. The lubricating oil can also be supplied between the second vane 151 and the vane groove of the second cylinder 152 via the 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.

[0124] 4, at least one of first vane 122 and second vane 151 is disposed on the lower side in a vertical direction (Y direction) perpendicular to the first direction inside case 10. In this embodiment, first vane 122 and second vane 151 are disposed on the lower side in a vertical direction (Y direction) perpendicular to the first direction inside case 10.

[0125] A hole is formed in the outer surface of at least one of the first cylinder 125 and the second cylinder 152 corresponding to at least one of the first vane 122 and the second vane 151, allowing lubricating oil to be supplied from the oil storage chamber 28 to the lower end side of at least one of the first vane 122 and the second vane 151.

[0126] In this embodiment, a hole is formed in the outer peripheral surface of first cylinder 125, through which lubricating oil can be supplied from oil reservoir chamber 28 to the lower end side of first vane 122. In this embodiment, this hole is a through hole 128. Through hole 128 has the function of biasing first vane 122 by allowing elastic member 129 to pass through it, and constitutes part of second lubricating oil supply path 60. Lubricating oil is supplied from through hole 128 to the lower end side of first vane 122.

[0127] It is desirable that through-hole 128 extend downward in the vertical direction (Y direction) relative to first vane 122. This allows lubricating oil to be stored in oil reservoir 28 from below in the vertical direction (Y direction), making it easier to introduce lubricating oil into through-hole 128. As a result, it becomes easier to supply lubricating oil to first vane 122, making it easier to maintain the lubrication of first vane 122.

[0128] Furthermore, a hole is formed in the outer peripheral surface of second cylinder 152 that allows lubricating oil to be supplied from oil reservoir 28 to the lower end side of second vane 151. This hole constitutes part of second lubricating oil supply path 60. Lubricating oil is supplied from this hole to the lower end side of second vane 151. It is desirable that the hole extend downward in the vertical direction (Y direction) relative to second vane 151. This allows lubricating oil to be stored in oil reservoir 28 from below in the vertical direction (Y direction), making it easier to introduce lubricating oil into the hole. As a result, it becomes easier to supply lubricating oil to second vane 151, making it easier to maintain the lubrication of second vane 151.

[0129] In rolling piston type electric compressor 1 according to an embodiment of the present disclosure, oil reservoir chamber 28 is formed to be surrounded by case 10, first cylinder 125, second cylinder 152, front side plate 140, rear side plate 190, and middle side plate 160, so that oil reservoir chamber 28 can be located isolated from discharge path 3, thereby suppressing lubricating oil from being carried out of the compressor through discharge path 3. Furthermore, oil reservoir chamber 28 is formed to be surrounded by case 10, first cylinder 125, second cylinder 152, front side plate 140, rear side plate 190, and middle side plate 160, so that the entire internal space of case 10 is configured as an oil reservoir and lubricating oil is supplied to the compression mechanism by siphoning, etc., eliminating the need to supply lubricating oil by siphoning, etc., and therefore lubricating oil can be reliably supplied to sliding parts of compression mechanism 20. Furthermore, since oil reservoir 28 and first discharge path 6 are isolated from each other by portions 158, 186 of the peripheral edges of second cylinder 152 and middle side plate 160, respectively, less machining is required to provide oil reservoir 28 than when the oil reservoir is provided in a thick portion of the case, making it possible to construct rolling piston type electric compressor 1 at low cost. As a result, it is possible to provide a rolling piston type electric compressor 1 that is inexpensive and highly reliable.

[0130] 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.

[0131] 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.

[0132] In rolling piston type electric compressor 1 according to one embodiment of the present disclosure, first vane 122 and second vane 151 are disposed inside case 10 on the lower side in a vertical direction (Y direction) perpendicular to the first direction, and through holes (for example, through hole 128 in first cylinder 125) are formed in the outer peripheral surfaces of first cylinder 125 and second cylinder 152 to allow lubricating oil to be supplied from oil reservoir 28 to the lower ends of first vane 122 and second vane 151. This makes it easier to introduce lubricating oil into the through holes when lubricating oil is stored in oil reservoir 28 from below in the vertical direction (Y direction). As a result, lubricating oil can be more easily supplied to first vane 122 and second vane 151, thereby improving the reliability of sliding of first vane 122 and second vane 151.

[0133] 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.

[0134] 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.

[0135] In a 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.

[0136] In a 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] [Note] The present embodiment includes the following disclosure.

[0141] [Configuration 1] a case provided with an intake path and a discharge path; an electric motor housed in the case; a compression mechanism that is housed in the case and arranged horizontally alongside the electric motor, and that draws in refrigerant that has been drawn through the suction path and passed through the electric motor, compresses the refrigerant, and discharges the refrigerant to the discharge path; an oil separator provided on the discharge path to separate lubricating oil mixed in the refrigerant from the refrigerant; The compression mechanism includes: a rotating shaft driven by the electric motor and having an axis extending in a first direction; a first piston that is rotatable in an eccentric state 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 a refrigerant between the first piston and the first vane; a front side plate that abuts against the first cylinder in the first direction and that is in contact with the first compression chamber; a second piston that is disposed at an interval from the first piston on an opposite side to an side on which the front side plate is disposed in the first direction with respect to the first piston, and that is rotatable in an eccentric state with respect to the axis center in association with rotation of the rotation shaft; a second vane that abuts against the second piston in a direction intersecting the first direction; a second cylinder that accommodates the second piston and the second vane and defines a second compression chamber that compresses a refrigerant between the second piston and the second vane; a rear side plate that abuts against the second cylinder from a side opposite to a side on which the front side plate is disposed in the first direction and that abuts against the second compression chamber; a middle side plate that is disposed between the first cylinder and the second cylinder in the first direction and separates the first compression chamber from the second compression chamber, each of the front side plate and the rear side plate abuts against an inner circumferential surface of the case in a direction intersecting the first direction; an oil reservoir chamber is formed surrounded by the case, the first cylinder, the second cylinder, the front side plate, the rear side plate, and the middle side plate, a first discharge passage connecting the first compression chamber and the oil separator is formed in the second cylinder, the rear side plate, and the middle side plate; In each of the second cylinder and the middle side plate, the oil storage chamber and the first discharge path are isolated from each other by a portion of a peripheral edge portion, a first supply path that branches off from the discharge path and is capable of supplying the lubricating oil separated by the oil separator to the oil storage chamber; a second supply path is formed through which lubricating oil is supplied from the oil reservoir and through which the lubricating oil can be supplied to a sliding position of the compression mechanism;

[0142] [Configuration 2] At least one of the first vane and the second vane is disposed on a lower side in a vertical direction intersecting the first direction inside the case, a hole that can supply lubricating oil from the oil reservoir to a lower end side of the at least one of the first vane and the second vane from the oil reservoir chamber is formed in an outer peripheral surface of the at least one of the first cylinder and the second cylinder that corresponds to the at least one of the first vane and the second vane.

[0143] [Configuration 3] 3. The rolling piston type electric compressor according to claim 1, 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.

[0144] [Configuration 4] 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.

[0145] [Configuration 5] 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.

[0146] [Configuration 6] 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.

[0147] [Configuration 7] 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.

[0148] [Configuration 8] 8. The rolling piston type electric compressor according to any one of configurations 1 to 7, wherein a throttle section where the cross-sectional area of ​​the flow path of the lubricating oil is reduced is provided midway along the second supply path.

[0149] 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. [Explanation of symbols]

[0150] 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 circumferential 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 circumferential 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 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, 157, 170, 185, 198 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 passage, 140 Front side plate, 141 outer periphery, 142 first bearing portion, 143 first intake port, 144 oil supply groove, 145A first throttle portion, 146A second throttle portion, 147 first passage, 150 second piston, 151 second vane, 152 second cylinder, 158, 186 part of peripheral portion, 160 middle side plate, 161 first member, 163 first groove, 164 first discharge port, 165, 193 discharge valve, 173 third passage, 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.

Claims

1. a case provided with an intake path and a discharge path; an electric motor housed in the case; a compression mechanism that is housed in the case and arranged horizontally alongside the electric motor, and that draws in refrigerant that has been drawn through the suction path and passed through the electric motor, compresses the refrigerant, and discharges the refrigerant to the discharge path; an oil separator provided on the discharge path to separate lubricating oil mixed in the refrigerant from the refrigerant; The compression mechanism includes: a rotating shaft driven by the electric motor and having an axis extending in a first direction; a first piston that is rotatable in an eccentric state 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 between the first piston and the first vane to compress a refrigerant; a front side plate that abuts against the first cylinder in the first direction and that is in contact with the first compression chamber; a second piston that is disposed at an interval from the first piston on an opposite side of the first piston from a side on which the front side plate is disposed in the first direction, and that is rotatable in an eccentric state with respect to the axis center in association with rotation of the rotation shaft; a second vane that abuts against the second piston in a direction intersecting the first direction; a second cylinder that accommodates the second piston and the second vane, and defines a second compression chamber between the second piston and the second vane to compress a refrigerant; a rear side plate that abuts against the second cylinder from a side opposite to a side on which the front side plate is disposed in the first direction and that is in contact with the second compression chamber; a middle side plate that is disposed between the first cylinder and the second cylinder in the first direction and separates the first compression chamber from the second compression chamber, each of the front side plate and the rear side plate abuts against an inner circumferential surface of the case in a direction intersecting the first direction; an oil reservoir chamber is formed surrounded by the case, the first cylinder, the second cylinder, the front side plate, the rear side plate, and the middle side plate, a first discharge passage connecting the first compression chamber and the oil separator is formed in the second cylinder, the rear side plate, and the middle side plate; In each of the second cylinder and the middle side plate, the oil storage chamber and the first discharge path are isolated from each other by a portion of a peripheral edge portion, a first supply path is formed that branches off from the discharge path and is capable of supplying the lubricating oil separated by the oil separator to the oil storage chamber; a second supply path through which the lubricating oil is supplied from the oil reservoir and through which the lubricating oil can be supplied to a sliding position of the compression mechanism;

2. At least one of the first vane and the second vane is disposed on a lower side in a vertical direction intersecting the first direction inside the case, 2. The rolling piston type electric compressor according to claim 1, wherein an outer peripheral surface of at least one of the first cylinder and the second cylinder corresponding to at least one of the first vane and the second vane is formed with a hole through which lubricating oil can be supplied from the oil reservoir to a lower end side of at least one of the first vane and the second vane.

3. 3. The rolling piston type electric compressor according to claim 1, 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.

4. 3. The rolling piston type electric compressor according to claim 1, 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 rotary shaft.

5. 3. The rolling piston type electric compressor according to claim 1, 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.

6. 3. The rolling piston type electric compressor according to claim 1, 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.

7. 3. The rolling piston type electric compressor according to claim 1, 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.

8. 3. The rolling piston type electric compressor according to claim 1, wherein a throttle portion is provided in the second supply path, the throttle portion having a reduced cross-sectional area for the lubricating oil flow path.

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