Rolling piston type electric compressor

Abstract

To provide a rolling piston type electric compressor having high reliability.SOLUTION: A rolling piston type electric compressor 1 includes a compression mechanism 20. The compression mechanism 20 includes a plate member 25. The plate member 25 is adjacent to a compression chamber of the compression mechanism 20. In the plate member 25, a recess 149 serving as an oil storage chamber 28 within which lubrication oil can be stored is provided. A first supply passage 50 is formed which diverges from a discharge passage 3 and can supply lubrication oil separated from an oil separator 40 to the oil storage chamber 28. A second supply passage is formed to which the lubrication oil is supplied from the oil storage chamber 28 to a slide position of the compression mechanism 20.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] Japanese Patent Laid-Open Publication No. 58-20974 (Patent Document 1) is a prior art document that discloses a hermetic compressor. The hermetic compressor described in Patent Document 1 includes a compressor unit and an oil separator. The oil separator separates the refrigerant discharged from the compressor unit from the lubricating oil mixed in the refrigerant. The refrigerant from which the lubricating oil has been separated is discharged from a discharge port that opens on the top surface of the oil separator. The lubricating oil separated by the oil separator accumulates in the lower part of the oil separator.

[0003] Japanese Patent Laid-Open Publication No. 2005-105985 (Patent Document 2) is a prior art document that discloses a horizontal rotary compressor. The horizontal rotary compressor described in Patent Document 2 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 58-20974 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-105985 Summary of the Invention [Problem to be solved by the invention]

[0005] In the hermetic compressor described in Patent Document 1, a portion where lubricating oil accumulates is located near the refrigerant discharge path, which means that the lubricating oil may be carried out of the compressor through the discharge path. In addition, in the horizontal rotary compressor described in Patent Document 2, a lubricating oil storage chamber is formed throughout the entire internal space of the case, which means that it may be difficult to siphon up the lubricating oil when supplying it to the compression mechanism by siphoning it up. Therefore, in Patent Documents 1 and 2, the reliability of the rolling piston type electric compressor may be reduced due to insufficient supply of lubricating oil to the sliding positions of the compression mechanism.

[0006] 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 highly reliable. [Means for solving the problem]

[0007] 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 on the discharge path and separates lubricating oil mixed in the refrigerant from the refrigerant. The compression mechanism includes a rotating shaft, a piston, vanes, a cylinder, and a plate member. The rotating shaft is driven by the electric motor and has an axis extending in a first direction. The piston is rotatable eccentrically with respect to the axis as the rotating shaft rotates. The vane abuts against the piston in a direction intersecting the first direction. The cylinder houses the piston and vane, and a compression chamber that compresses the refrigerant is formed between the piston and the vane. The plate member abuts against the cylinder in a first direction and contacts the compression chamber. The plate member has a recessed portion formed therein that serves as an oil storage chamber capable of storing lubricating oil. A first supply path is formed that branches off from the discharge path and can supply the lubricating oil separated from the oil separator to the oil storage chamber. A second supply path is formed that can supply the lubricating oil from the oil storage chamber to a sliding position of the compression mechanism.

[0008] In one embodiment of the present disclosure, the plate member includes a front side plate and a rear side plate. The front side plate defines a suction pressure region in the case where the drawn refrigerant exists, and a discharge pressure region between the inner circumferential surface of the case and the outer circumferential surface of the compression mechanism where the refrigerant is discharged from the compression chamber, so that the regions are aligned in the first direction. The rear side plate is disposed opposite the front side plate in the first direction, with the compression chamber sandwiched therebetween. The oil reservoir is located inside a recess provided in the front side plate.

[0009] 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.

[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 rear side plate and the rotary 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 vane and the cylinder.

[0012] 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 plate member and the piston.

[0013] In one embodiment of the present disclosure, the piston includes a first piston and a second piston. The first piston and the second piston are spaced apart from each other in a first direction. The vane includes a first vane and a second vane. The first vane abuts against the first piston in a direction intersecting the first direction. The second vane abuts against the second piston in a direction intersecting the first direction. The cylinder includes a first cylinder and a second cylinder. The first cylinder houses the first piston and the first vane. The second cylinder houses the second piston and the second vane. The compression chamber includes a first compression chamber and a second compression chamber. The first compression chamber compresses a refrigerant between the first vane and the first cylinder and the first piston. The second compression chamber compresses a refrigerant between the second vane and the second cylinder and the second piston. The plate member includes a middle side plate that separates the first compression chamber from the second compression chamber in the first direction. 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.

[0014] 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]

[0015] According to the present disclosure, it is possible to provide a highly reliable rolling piston type electric compressor. [Brief explanation of the drawings]

[0016] [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 the 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] 4 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3, seen from the direction of the arrow XX. [Figure 11] 1. FIG. 1 is a partial cross-sectional view of the rolling piston type electric compressor of FIG. 1, taken along the line XI-XI. [Figure 12] 12 is an enlarged cross-sectional view of a portion XII in FIG. 11 showing the configuration of a lubricating oil supply path. FIG. [Figure 13] 1. FIG. 3 is a partial cross-sectional view of the rolling piston type electric compressor of FIG. 1, taken along the line XIII-XIII. [Figure 14] 14 is an enlarged cross-sectional view of a portion XIV in FIG. 13, showing the configuration of a lubricating oil supply path. FIG. [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. [Figure 17] 17 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3, seen from the direction of the arrows along line XVII-XVII. DETAILED DESCRIPTION OF THE INVENTION

[0017] 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.

[0018] 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 10.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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).

[0024] 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).

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] The electric motor 30 is housed in a case 10. In this embodiment, the electric motor 30 is housed in a first case 11.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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 .

[0036] 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.

[0037] 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.

[0038] 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.

[0039] As shown in FIG. 4, the first compression section 22 has a first piston 120 , a first vane 122 , and a first cylinder 125 .

[0040] 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).

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] As shown in FIG. 3, the second compression section 23 includes a second piston 150 , a second vane 151 , and a second cylinder 152 .

[0047] The second piston 150 is disposed at a distance from the first piston 120 on the side opposite to 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).

[0048] 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.

[0049] In second compression section 23, second vane 151, second cylinder 152, and second piston 150 form second compression chamber 27 for compressing refrigerant.

[0050] 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.

[0051] 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).

[0052] 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.

[0053] An oil reservoir 28 is disposed in the front side plate 140. The oil reservoir 28 is capable of storing lubricating oil. Details of the oil reservoir 28 will be described later.

[0054] The middle side plate 160 is disposed between the first cylinder 125 and the second cylinder 152 in the first direction (Z direction), and separates the first compression chamber 26 and the second compression chamber 27 from each other.

[0055] The middle side plate 160 has a first member 161 and a second member 178 .

[0056] 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.

[0057] 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.

[0058] 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). ... 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.

[0059] 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.

[0060] 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).

[0061] 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.

[0062] 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).

[0063] 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).

[0064] 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).

[0065] 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.

[0066] 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).

[0067] 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).

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 .

[0072] 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.

[0073] The first discharge path 6 is a path that discharges the 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.

[0074] 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.

[0075] 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.

[0076] 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 is defined in a portion of the interior of the case 10, where the refrigerant drawn into the case 10 is present. The remaining portion of the interior of the case 10 is defined as a discharge pressure region 3A, where the refrigerant discharged from the compression chamber between the inner circumferential surface 15 of the case 10 and the outer circumferential surface of the compression mechanism 20 is present.

[0077] 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.

[0078] 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.

[0079] 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 of 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).

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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).

[0086] 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.

[0087] 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 can supply the lubricating oil separated from the oil separator 40 to the oil reservoir 28. The second supply path 60 can supply the lubricating oil from the oil reservoir 28 to a sliding position of the compression mechanism 20.

[0088] 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).

[0089] 7 and 8, a first oil supply hole 196 is provided in rear side plate 190. First oil supply hole 196 penetrates rear side plate 190 in a first direction (Z direction). Similar to first oil supply hole 196, first oil supply holes 153, 181, 171, 133, and 144 are provided in second cylinder 152, second member 178, first member 161, first cylinder 125, and front side plate 140.

[0090] The first supply path 50 is made up of the second communication hole 17 and the first oil supply holes 196, 153, 181, 171, 133, and 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).

[0091] 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, 133, and 144 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.

[0092] 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.

[0093] 3 and 9, plate member 25 is provided with a recess that serves as oil reservoir 28 capable of storing lubricating oil. In the present embodiment, oil reservoir 28 is the interior of recess 149 provided in front side plate 140.

[0094] Oil reservoir 28 is formed by recessing front side plate 140 from the suction pressure region 2A side in the first direction (Z direction) to form recess 149. Recess 149 is sealed from the suction pressure region 2A side by lid 148 (see FIG. 3). This forms oil reservoir 28 in front side plate 140.

[0095] By providing recess 149, which becomes oil reservoir chamber 28, on the low-pressure suction pressure region 2A side, oil reservoir chamber 28 is less likely to be subjected to discharge pressure from discharge pressure region 3A. This makes it possible to form oil reservoir chamber 28 in front side plate 140 while suppressing deformation of front side plate 140.

[0096] When viewed from the first direction (Z direction), the oil reservoir 28 is provided in an arc shape so as to surround the rotary shaft 21. The lubricating oil supplied from the first oil supply hole 144 to the oil reservoir 28 is stored in order from the bottom in the Y direction.

[0097] Because the oil reservoir 28 is provided in an arc shape surrounding the rotary shaft 21, it can be positioned higher than the bottom of the case, compared to when the oil reservoir is provided at the bottom of the case. This makes it less susceptible to the influence of gravity when supplying lubricating oil, compared to when the lubricating oil stored at the bottom of the case is lifted by, for example, sucking it up into the compression mechanism. As a result, it is possible to prevent the lubricating oil from being supplied unstably due to the influence of gravity. Note that the shape of the oil reservoir 28 is not limited to an arc shape. The size and shape of the oil reservoir 28 are set within a range that can store the amount of lubricating oil to be supplied to the sliding parts of the compression mechanism 20.

[0098] If an oil reservoir were provided at the bottom of case 10, lubricating oil would seep into the vane grooves from through-holes provided in the cylinders (in this embodiment, for example, through-hole 128 provided in first cylinder 125). As a result, the vanes would be immersed in the lubricating oil, which could cause resistance to the operation of the vanes.

[0099] In the present embodiment, by providing oil reservoir chamber 28 inside front side plate 140, oil reservoir chamber 28 is isolated from first vane 122 and second vane 151, and therefore first vane 122 and second vane 151 are prevented from being immersed in lubricating oil. As a result, resistance to the sliding of the vanes is prevented while the sliding characteristics of the vanes are ensured, and compression mechanism 20 can be driven efficiently.

[0100] FIG. 10 is a cross-sectional view of the rolling piston type electric compressor of FIG. 3 as viewed from the direction of the arrow XX.

[0101] 7 and 10, the front side plate 140 is provided with communication holes 145 and 146. The communication holes 145 and 146 communicate with the oil reservoir chamber .

[0102] A first throttling portion 145A and a second throttling portion 146A are provided in the second supply path 60. In the present embodiment, the first throttling portion 145A and the second throttling portion 146A are provided in the front side plate 140. The first throttling portion 145A and the second throttling portion 146A communicate with the communication holes 145, 146. In the present embodiment, the first throttling portion 145A and the second throttling portion 146A have a slit shape.

[0103] Lubricating oil is supplied from oil reservoir chamber 28 to sliding portions of compression mechanism 20 via communication holes 145, 146, first throttle portion 145A, and second throttle portion 146A.

[0104] Fig. 11 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 XI-XI. Fig. 12 is a cross-sectional view of an enlarged portion XII in Fig. 11, showing the configuration of a lubricating oil supply path.

[0105] 7, 11, and 12, 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.

[0106] 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 to a sliding portion between the first bearing portion 142 and the first shaft portion 111 via the communication hole 145, the first throttle portion 145A, and the first path 147.

[0107] 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.

[0108] Fig. 13 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 XIII-XIII. Fig. 14 is a cross-sectional view of an enlarged portion XIV in Fig. 13, showing the configuration of a lubricating oil supply path.

[0109] As shown in Figures 7, 13, and 14, 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 path 197. The second path 197 is connected to the second bearing portion 191.

[0110] 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, the lubricating oil is configured to be able to be supplied to a sliding portion between second bearing 191 and second shaft 112 via communication hole 146, second throttle portion 146A, second oil supply holes 134, 172, 182, 154, and second path 197.

[0111] 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.

[0112] FIG. 15 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 XV-XV.

[0113] As shown in FIGS. 7 and 15 , 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.

[0114] 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.

[0115] 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.

[0116] The second supply path 60 is configured to be able to supply lubricating oil to sliding portions between the plate member 25 and the piston. In the present embodiment, the 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 in the middle side plate 160. The 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 in the middle side plate 160.

[0117] 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. Fig. 17 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 XVII-XVII.

[0118] As shown in Figures 7, 16, and 17, 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.

[0119] 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.

[0120] 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.

[0121] The second supply path 60 is configured to be able to supply lubricating oil to a sliding portion between the vane and the cylinder. In this embodiment, 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. Furthermore, the lubricating oil can be supplied between the second vane 151 and the vane groove of the second cylinder 152 via the fifth path 156. Because the fifth path 136 is provided on both end surfaces of the first cylinder 125 in the first direction (Z direction), the lubricating oil can be supplied uniformly to the position where the first vane 122 and the first cylinder 125 slide. Similar to the fifth path 136, the fifth path 156 can also supply lubricating oil uniformly to the position where the second vane 151 and the second cylinder 152 slide.

[0122] In rolling piston type electric compressor 1 according to one embodiment of the present disclosure, by providing front side plate 140 with recess 149 that serves as oil reservoir chamber 28, oil reservoir chamber 28 can be located away from discharge path 3, thereby suppressing lubricating oil from being carried out of the compressor through discharge path 3. Furthermore, by locating oil reservoir chamber 28 on front side plate 140, 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. As a result, a highly reliable rolling piston type electric compressor 1 can be provided.

[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 rolling piston electric compressor 1 according to an embodiment of the present disclosure, oil reservoir chamber 28 is disposed inside front side plate 140, which is thicker than rear side plate 190 in order to partition the internal space of case 10. This makes it possible to provide recess 149, which serves as oil reservoir chamber 28, in thicker front side plate 140 compared to when an oil reservoir chamber is provided in rear side plate 190, and therefore oil reservoir chamber 28 can be formed without increasing the thickness of plate member 25. This allows oil reservoir chamber 28 to be formed in plate member 25 without increasing the size of rolling piston electric compressor 1 in the horizontal direction (Z direction).

[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, lubricating oil is supplied to the sliding points between the vanes and the cylinders, and lubricating oil is supplied between the first vane 122 and the first cylinder 125, and between the second vane 151 and the second cylinder 152, thereby suppressing wear on the vanes and the cylinders.

[0129] In a rolling piston type electric compressor 1 according to one embodiment of the present disclosure, wear on the end faces of the first piston 120 and the second piston 150 in the first direction (Z direction) can be suppressed by supplying lubricating oil to the sliding points between the plate member 25 and the pistons.

[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 electric compressor according to the present disclosure may include a two-stage compression mechanism in which refrigerant compressed by a first compression section is supplied to a second compression section for further compression. The rolling piston electric compressor according to the present disclosure may also be configured with a single compression section including a piston, a vane, and a cylinder. When the rolling piston electric compressor is configured with a single compression section, a middle side plate need not be provided. The oil reservoir is not limited to being disposed in front side plate 140, and may be disposed inside rear side plate 190 or middle side plate 160.

[0133] [Note] The present embodiment includes the following disclosure.

[0134] [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 piston that is rotatable in an eccentric state with respect to the axis as the rotary shaft rotates; a vane that abuts against the piston in a direction intersecting the first direction; a cylinder that accommodates the piston and the vane, and defines a compression chamber between the piston and the vane for compressing a refrigerant; a plate member that abuts against the cylinder in the first direction and that contacts the compression chamber, The plate member is provided with a recessed portion, the interior of which serves as an oil storage chamber capable of storing lubricating oil, 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 that can supply lubricating oil from the oil reservoir to a sliding position of the compression mechanism;

[0135] [Configuration 2] The plate member is a front side plate that partitions a suction pressure region inside the case, where the sucked refrigerant exists, and a discharge pressure region between an inner circumferential surface of the case and an outer circumferential surface of the compression mechanism, where the refrigerant discharged from the compression chamber exists, so that the regions are aligned in the first direction; a rear side plate disposed opposite the front side plate with the compression chamber therebetween in the first direction, 2. The rolling piston type electric compressor according to claim 1, wherein the oil reservoir is located inside the recess provided in the front side plate.

[0136] [Configuration 3] 3. The rolling piston type electric compressor according to claim 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] 4. The rolling piston type electric compressor according to claim 2, 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.

[0138] [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 the vane and the cylinder.

[0139] [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 plate member and the piston.

[0140] [Configuration 7] the pistons include a first piston and a second piston spaced apart from each other in the first direction; the vanes include a first vane that contacts the first piston in a direction intersecting the first direction and a second vane that contacts the second piston in a direction intersecting the first direction, the cylinders include a first cylinder that houses the first piston and the first vane, and a second cylinder that houses the second piston and the second vane; the compression chamber includes a first compression chamber that compresses a refrigerant between the first vane and the first cylinder and the first piston, and a second compression chamber that compresses a refrigerant between the second vane and the second cylinder and the second piston, the plate member includes a middle side plate that separates the first compression chamber and the second compression chamber in the first direction, 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] 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.

[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. [Explanation of symbols]

[0143] 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, 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, 144, 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, 145, 146 communicating hole, 145A first throttle portion, 146A second throttle portion, 147 first passage, 148 cover portion, 149 recess, 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 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 piston that is rotatable in an eccentric state with respect to the axis as the rotary shaft rotates; a vane that abuts against the piston in a direction intersecting the first direction; a cylinder that accommodates the piston and the vane, and defines a compression chamber between the piston and the vane for compressing a refrigerant; a plate member that abuts against the cylinder in the first direction and that contacts the compression chamber, The plate member is provided with a recessed portion, the interior of which serves as an oil storage chamber capable of storing lubricating oil, 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 that can supply lubricating oil from the oil reservoir to a sliding position of the compression mechanism;

2. The plate member is a front side plate that partitions a suction pressure region inside the case, where the sucked refrigerant exists, and a discharge pressure region between an inner peripheral surface of the case and an outer peripheral surface of the compression mechanism, where the refrigerant discharged from the compression chamber exists, so that the partitions are aligned in the first direction; a rear side plate disposed opposite the front side plate in the first direction with the compression chamber therebetween, 2. The rolling piston type electric compressor according to claim 1, wherein the oil reservoir is located inside the recess formed in the front side plate.

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

4. 4. The rolling piston type electric compressor according to claim 2, 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 the vane and the cylinder.

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 plate member and the piston.

7. the pistons include a first piston and a second piston spaced apart from each other in the first direction; the vanes include a first vane that contacts the first piston in a direction intersecting the first direction and a second vane that contacts the second piston in a direction intersecting the first direction, the cylinders include a first cylinder that houses the first piston and the first vane, and a second cylinder that houses the second piston and the second vane; the compression chamber includes a first compression chamber that compresses a refrigerant between the first vane and the first cylinder and the first piston, and a second compression chamber that compresses a refrigerant between the second vane and the second cylinder and the second piston, the plate member includes a middle side plate that separates the first compression chamber and the second compression chamber in the first direction, 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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