Electric compressor

Abstract

To suppress vibration of an electric compressor, and to improve NV performance.SOLUTION: An electric rotary compressor RC includes a horizontally arranged rotating shaft 200, an electric motor 10 for rotating the rotating shaft 200, a compression mechanism 30 driven by the rotating shaft 200, a front housing 110b housing the electric motor 10, a rear housing 110c housing the compression mechanism 30, and a partition wall 111 disposed between an opening end of the front housing 110b and an opening end of the rear housing 110c while rotatably supporting the rotating shaft 200 in an airtight manner. The electric rotary compressor RC further includes a vibration control member 300 (a first vibration control member 300A and a second vibration control member 300B) disposed between the compression mechanism 30 and the rear housing 110c.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electric compressor that compresses a refrigerant by an electric motor. [Background technology]

[0002] An electric rotary compressor, which is one example of an electric compressor, has a characteristic that the gas compression load torque varies greatly depending on the rotation angle of the rotating shaft, and as a result, the NV (Noise-Vibration) performance is inferior compared to a scroll compressor. For this reason, as described in JP 2021-148104 A (Patent Document 1), a technology has been proposed in which the periphery of the housing of the electric rotary compressor is covered with a soundproof cover made of a porous material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-148104 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the technology proposed in Patent Document 1 is applied to an electric rotary compressor, although the noise generated by the electric rotary compressor can be reduced, it is difficult to suppress the vibration generated by the electric rotary compressor. Note that this problem is not limited to electric rotary compressors, but also occurs in the same way in well-known compressors in which the gas compression load torque varies greatly depending on the rotation angle of the rotating shaft.

[0005] Therefore, an object of the present invention is to provide an electric compressor in which vibration is suppressed and NV performance is improved. [Means for solving the problem]

[0006] The electric compressor has a horizontally disposed rotating shaft, an electric motor that rotates the rotating shaft, a compression mechanism driven by the rotating shaft, a front housing that houses the electric motor, a rear housing that houses the compression mechanism, and a partition that supports the rotating shaft in a rotatable and sealed state and is disposed between an open end side of the front housing and an open end side of the rear housing. In addition to the above configuration, the electric compressor further has a vibration-isolating member disposed between the compression mechanism and the rear housing. Effect of the Invention

[0007] According to the present invention, in an electric compressor that compresses a refrigerant by an electric motor, it is possible to suppress vibrations and improve the NV performance. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a vertical sectional view showing a first embodiment of a horizontally-mounted electric rotary compressor. [Diagram 2] FIG. 1 is an enlarged view of a main portion of a first embodiment of a horizontally-mounted electric rotary compressor. [Diagram 3] FIG. 1 is a comparison diagram between a general technique and the first embodiment. [Figure 4] FIG. 4 is a vertical sectional view showing a second embodiment of a horizontally-mounted electric rotary compressor. [Diagram 5] FIG. 4 is an enlarged view of a main portion of a horizontally-mounted electric rotary compressor according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of a horizontally-mounted electric rotary compressor RC to which the present invention is applied. Note that the electric rotary compressor RC described below is merely one example, and should not be construed as being limited to this configuration. Therefore, the present invention can be applied to various electric rotary compressors well known to those skilled in the art. Here, the electric rotary compressor RC is given as one example of an electric compressor.

[0010] First, the basic configuration of the electric rotary compressor RC will be described. The electric rotary compressor RC has a horizontally long housing 110. The housing 110 includes a cylindrical center housing 110a, a cylindrical front housing 110b with a bottom, the open end of which is joined to the front end (left end in FIG. 1) of the center housing 110a, and a cylindrical rear housing 110c with a bottom, the open end of which is joined to the rear end (right end in FIG. 1) of the center housing 110a. Here, the center housing 110a and the front housing 110b are formed to have approximately the same diameter, and the rear housing 110c is formed to have a diameter larger than the center housing 110a and the front housing 110b by a predetermined dimension. Note that the center housing 110a, the front housing 110b, and the rear housing 110c are not limited to a configuration having a cylindrical cross section, and may be formed, for example, in a rectangular tube shape having a rectangular or polygonal cross section.

[0011] The inside of the housing 110 is divided into a first housing chamber 113 on the front housing 110b side and a second housing chamber 115 on the rear housing 110c side by a partition wall 111 integrally provided on the center housing 110a. The first housing chamber 113 is formed by the center housing 110a and the front housing 110b. The second housing chamber 115 is formed by the center housing 110a and the rear housing 110c.

[0012] The partition wall 111 is integrally formed with the center housing 110a by casting, for example. However, the partition wall 111 is not limited to being integrally formed with the center housing 110a by casting, and may be integrated with the center housing 110a by any means. For example, the partition wall 111 may be integrated with the center housing 110a by welding, or may be integrated with the center housing 110a by a known joining technique other than welding.

[0013] A boss portion 111a protruding toward the first housing chamber 113 is formed in the radial center of the partition portion 111. A first shaft hole 111b penetrating the partition portion 111 from the tip surface of the boss portion 111a to the surface on the second housing chamber 115 side is also formed in the partition portion 111.

[0014] The first shaft hole 111b supports the middle part of the rotating shaft 200 extending in the horizontal direction (front-rear direction) so as to be freely rotatable. One end (front end) of the rotating shaft 200 is located in the first accommodation chamber 113. The other end (rear end) of the rotating shaft 200 is located in the second accommodation chamber 115. A minute gap (clearance) is formed between the inner peripheral surface of the first shaft hole 111b and the outer peripheral surface of the rotating shaft 200. This minute gap is set so that the rotating shaft 200 can rotate relative to the first shaft hole 111b and can be sealed by the lubricating oil mixed in the refrigerant. Therefore, the partition wall portion 111 is disposed between the open end side of the front housing 110b and the open end side of the rear housing 110c while supporting the rotating shaft 200 in a rotatable and sealed state.

[0015] The first housing chamber 113 houses the electric motor unit 10 that rotates the rotary shaft 200. The first housing chamber 113 is connected to a low pressure side of an external refrigerant circuit (not shown) via a refrigerant inlet 117 formed at a predetermined location in the front housing 110b. In the electric rotary compressor RC shown in FIG. 1, the refrigerant inlet 117 is formed at a side portion of the front housing 110b, but the refrigerant inlet 117 may be formed at an upper portion of the front housing 110b, for example.

[0016] The electric motor unit 10 includes a stator 11 disposed on the outside and a rotor 12 disposed inside the stator 11 .

[0017] The stator 11 is fixed to the inner circumferential surface of the housing 110. Specifically, the stator 11 is fixed to the inner circumferential surface of a portion located closer to the front housing 110b than the partition wall portion 111 of the center housing 110a. The stator 11 includes a stator core 11a formed in a cylindrical shape from a magnetic material, and a stator coil 11b wound around teeth portions of the stator core 11a.

[0018] The rotor 12 is disposed radially inside the stator 11 with a predetermined gap therebetween. A permanent magnet is incorporated in the rotor 12. The rotor 12 is formed in a cylindrical shape, and is fixed integrally to the rotating shaft 200 with the front end side of the rotating shaft 200 penetrating through the hollow portion of the rotor 12.

[0019] The electric motor section 10 is configured such that when electric power is supplied to the stator coil 11b of the stator 11 via an airtight terminal section 20 provided at a predetermined location on the front housing 110b, the rotor 12 rotates, thereby rotating the rotating shaft 200.

[0020] The second housing chamber 115 houses the compression mechanism 30 driven by the rotary shaft 200. The compression mechanism 30 is configured as a rotary compression mechanism as described below. The second housing chamber 115 communicates with the high-pressure side of an external refrigerant circuit via a refrigerant outlet 119 formed at a predetermined location of the rear housing 110c, specifically, at an upper side of the end portion on the partition wall portion 111 side.

[0021] The lower part of the second housing chamber 115, i.e., the lower part of the rear housing 110c, forms a reservoir for lubricating oil that lubricates at least the compression mechanism part 30. Here, the lubricating oil is mainly stored in the second housing chamber 115, and is hardly stored in the first housing chamber 113.

[0022] The compression mechanism 30 has an outer diameter smaller than the inner diameter of the rear housing 110c. Therefore, the rear housing 110c can accommodate the compression mechanism 30. In addition, the lower part of the compression mechanism 30 is immersed in the lubricating oil stored in the lubricating oil storage part, that is, is located below the oil level OL of the lubricating oil.

[0023] The compression mechanism 30 includes a first compression mechanism 30A and a second compression mechanism 30B arranged on either side of the intermediate partition plate 40 in the front-rear direction. The first compression mechanism 30A is arranged on the partition wall 111 side of the intermediate partition plate 40, i.e., on the front side. The second compression mechanism 30B is arranged on the opposite side of the intermediate partition plate 40 from the partition wall 111 side, i.e., on the rear side. A through hole through which the rotating shaft 200 passes is formed in the radial center of the intermediate partition plate 40.

[0024] As shown in FIG. 2, the first compression mechanism portion 30A includes a first cylinder 31A, a first eccentric roller (rolling piston) 33A, and a first vane 35A.

[0025] One surface (front surface) of the first cylinder 31A is in close contact with the partition wall portion 111. The other surface (rear surface) of the first cylinder 31A is in close contact with the intermediate partition plate 40. The first cylinder 31A has a first cylinder chamber 32A with a circular cross section in the radial center.

[0026] The first eccentric roller 33A is attached integrally to a first eccentric portion 201 of the rotating shaft 200, which is located in the first cylinder chamber 32A of the first cylinder 31A. The first eccentric roller 33A eccentrically rotates in the first cylinder chamber 32A of the first cylinder 31A as the rotating shaft 200 rotates.

[0027] The first vane 35A is fitted vertically slidably into a first vane groove (not shown) extending vertically formed in the upper wall of the horizontally placed first cylinder 31A. The tip of the first vane 35A protrudes from the lower end of the first vane groove and is capable of abutting (sliding) against the outer circumferential surface of the first eccentric roller 33A.

[0028] A first back pressure chamber 37A is formed on the back side of the first vane 35A to apply the pressure in the second accommodation chamber 115 to the back side of the first vane 35A in order to press the first vane 35A toward the first eccentric roller 33A. The first back pressure chamber 37A communicates with the second accommodation chamber 115, which functions as a discharge chamber for the high-pressure refrigerant, via a first return hole 39A (described in detail later) formed in the upper wall of the first cylinder 31A.

[0029] Furthermore, a first spring 38A is housed in the first back pressure chamber 37A to bias the first vane 35A toward the first eccentric roller 33A during startup when the electric rotary compressor RC is not able to obtain high-pressure refrigerant. The pressing force of the first spring 38A is approximately 1 / 10 of the pressing force exerted by the high-pressure refrigerant during normal operation.

[0030] Furthermore, a first return hole 39A is formed in the upper wall of the first cylinder 31A and is connected to the first back pressure chamber 37A. This first return hole 39A opens to the outer circumferential surface of the upper side of the first cylinder 31A. Here, the first return hole 39A also serves as an introduction portion for the high-pressure refrigerant to the first back pressure chamber 37A, and has a function of recovering lubricating oil mixed in the high-pressure refrigerant in the second accommodation chamber 115 and guiding it to the first back pressure chamber 37A.

[0031] A first annular recess 111c is formed on the surface of the partition wall 111 facing the first storage chamber 113 so as to surround the boss portion 111a. The open end side of the first recess 111c is closed by a first closing plate 121 that is in close contact with the surface of the partition wall 111 facing the first storage chamber 113, thereby forming a first silencing chamber 45A separated from the first storage chamber 113. The first silencing chamber 45A communicates with a first discharge port (not shown) located in a high pressure chamber in the first cylinder chamber 32A of the first cylinder 31A through a first communication hole 111d (see FIG. 2) formed in the partition wall 111.

[0032] The second compression mechanism 30B has a similar configuration to the first compression mechanism 30A. Specifically, as shown in FIG. 2, the second compression mechanism 30B includes a second cylinder 31B, a second eccentric roller (rolling piston) 33B, and a second vane 35B.

[0033] One surface (front surface) of the second cylinder 31B is in close contact with the intermediate partition plate 40. The other surface (rear surface) of the second cylinder 31B is in close contact with the sound-absorbing chamber forming member 47. The second cylinder 31B has a second cylinder chamber 32B with a circular cross section in the radial center.

[0034] The second eccentric roller 33B is attached integrally to the second eccentric portion 202 of the rotating shaft 200 located in the second cylinder chamber 32B of the second cylinder 31B. The second eccentric roller 33B eccentrically rotates in the second cylinder chamber 32B of the second cylinder 31B in accordance with the rotation of the rotating shaft 200. The second eccentric portion 202 is provided with a phase difference of 180° with respect to the first eccentric portion 201 around the axis of the rotating shaft 200.

[0035] The second vane 35B is fitted vertically slidably into a second vane groove (not shown) extending vertically formed in the upper wall of the horizontally placed second cylinder 31B. The tip of the second vane 35B protrudes from the lower end of the second vane groove and is capable of abutting (sliding) against the outer circumferential surface of the second eccentric roller 33B.

[0036] A second back pressure chamber 37B is formed on the back side of the second vane 35B to apply the pressure in the second accommodation chamber 115 to the back side of the second vane 35B so as to press the second vane 35B toward the second eccentric roller 33B. The second back pressure chamber 37B communicates with the second accommodation chamber 115, which functions as a discharge chamber for the high-pressure refrigerant, via a second return hole 39B (described in detail later) formed in the upper wall of the second cylinder 31B.

[0037] A second spring 38B is housed in the second back pressure chamber 37B to bias the second vane 35B toward the second eccentric roller 33B during startup when the electric rotary compressor RC is not able to obtain high pressure refrigerant. The pressing force of the second spring 38B is about 1 / 10 of the pressing force of the high pressure refrigerant during normal operation, similar to the first spring 38A.

[0038] Furthermore, a second return hole 39B is formed in the upper wall of the second cylinder 31B, and is connected to the second back pressure chamber 37B. This second return hole 39B opens to the outer circumferential surface of the upper side of the second cylinder 31B. Here, the second return hole 39B also serves as an introduction portion for the high-pressure refrigerant to the second back pressure chamber 37B, and has a function of recovering lubricating oil mixed in the high-pressure refrigerant in the second accommodation chamber 115 and guiding it to the second back pressure chamber 37B.

[0039] A second shaft hole 47a is formed in the radial center of the sound absorbing chamber forming member 47. The rear end of the rotating shaft 200 and its vicinity are supported in the second shaft hole 47a so as to be freely rotatable. That is, the rotating shaft 200 is supported in a freely rotatable manner by the first shaft hole 111b formed in the partition wall portion 111 and the second shaft hole 47a formed in the sound absorbing chamber forming member 47, and these first shaft hole 111b and second shaft hole 47a form a bearing portion for the rotating shaft 200. Note that, similarly to the first shaft hole 111b, a minute gap is formed between the inner peripheral surface of the second shaft hole 47a and the outer peripheral surface of the rotating shaft 200.

[0040] Further, a second annular recess 47b is formed on the surface of the muffling chamber forming member 47 opposite to the second cylinder 31B, i.e., on the rear surface, so as to surround the second shaft hole 47a. The open end side of this second recess 47b is closed by a second closing plate 49 that is in close contact with the surface of the muffling chamber forming member 47 opposite to the second cylinder 31B, thereby forming a second muffling chamber 45B. The second muffling chamber 45B communicates with a second discharge port (not shown) located in the high pressure chamber in the second cylinder chamber 32B of the second cylinder 31B through a second communication hole 47c (see FIG. 2) formed in the muffling chamber forming member 47.

[0041] Here, the first closure plate 121, the first cylinder 31A, the intermediate partition plate 40, the second cylinder 31B, the sound absorbing chamber forming member 47, and the second closure plate 49 are fastened together with the partition wall portion 111 by a plurality of fastening members (e.g., through bolts) 60, and are fixed to the partition wall portion 111. In other words, the compression mechanism portion 30 including the first compression mechanism portion 30A and the second compression mechanism portion 30B is attached and fixed to the partition wall portion 111.

[0042] The first silencing chamber 45A and the second silencing chamber 45B are mutually communicated via a communication passage 51. The communication passage 51 is formed from the bottom of the first recess 111c to the bottom of the second recess 47b, penetrating the partition wall 111, the first cylinder 31A, the intermediate partition plate 40, the second cylinder 31B, and the silencing chamber forming member 47. Note that, although the communication passage 51 is positioned below the rotation shaft 200 in FIG. 2 for drawing purposes, the position where the communication passage 51 is formed is arbitrary.

[0043] Further, the second silencing chamber 45B communicates with the second storage chamber 115 via a discharge port 53 formed in the second closing plate 49.

[0044] A first suction port (not shown) located in the low pressure chamber in the first cylinder chamber 32A of the first cylinder 31A communicates with the first housing chamber 113 via a first suction passage 55 (see FIG. 2). The first suction passage 55 penetrates the first closure plate 121 and the partition wall portion 111 from the first housing chamber 113 side and is connected to the first suction port of the first cylinder 31A.

[0045] A second suction port (not shown) located in the low pressure chamber in the second cylinder chamber 32B of the second cylinder 31B communicates with the first housing chamber 113 via a first suction passage 55 (see FIG. 2) and a second suction passage (not shown). The second suction passage passes from the first suction passage 55 through the first cylinder 31A and the intermediate partition plate 40, and is connected to the second suction port of the second cylinder 31B.

[0046] As a lubricating oil supply system, a first oil passage 71, a second oil passage 72, and first to fourth oil guide holes 73 to 76 are provided to supply lubricating oil to the bearing portion (first shaft hole 111b, second shaft hole 47a) of the rotating shaft 200 and each sliding portion of the compression mechanism portion 30 (first compression mechanism portion 30A, second compression mechanism portion 30B).

[0047] The first oil passage 71 is formed as a passage having one end (lower end) that opens to the bottom of the second closure plate 49, i.e., the portion located in the lubricating oil reservoir, extending upward from there and then bending toward the rear end surface of the rotating shaft 200, and having the other end (upper end) that opens to the surface of the second closure plate 49 facing the sound-absorbing chamber forming member 47.

[0048] The second oil passage 72 has one end that opens to the rear end face of the rotating shaft 200 and communicates with the first oil passage 71, and is formed as a passage that extends from here along the axis of the rotating shaft 200 to a position beyond the first cylinder 31A, i.e., to a position corresponding to the first shaft hole 111b, and has the other end closed.

[0049] Furthermore, due to the pressure difference between the second storage chamber (discharge chamber; high pressure side) 115 and the first storage chamber (suction chamber; low pressure side) 113, the lubricating oil stored in the lower part of the second storage chamber 115 is sucked up through the first oil passage 71 and guided to the second oil passage 72.

[0050] One end of first oil guide hole 73 opens into second oil passage 72, extends radially outward from there within rotating shaft 200, and opens into the outer circumferential surface of rotating shaft 200 facing second shaft hole 47a at the other end.

[0051] One end of the second oil guide hole 74 opens into the second oil passage 72 , extends radially outward from there within the rotating shaft 200 , and opens into the outer circumferential surface of the second eccentric portion 202 of the rotating shaft 200 at the other end.

[0052] One end of the third oil guide hole 75 opens into the second oil passage 72 , extends radially outward from there within the rotating shaft 200 , and opens into the outer circumferential surface of the first eccentric portion 201 of the rotating shaft 200 at the other end.

[0053] One end of the fourth oil guide hole 76 opens into the second oil passage 72, extends radially outward from there within the rotating shaft 200, and has the other end opening into the outer circumferential surface of the rotating shaft 200 facing the first shaft hole 111b.

[0054] Next, a description will be given of the flow of the refrigerant in the basic configuration of the horizontal type electric rotary compressor RC. Note that the refrigerant contains lubricating oil in a mist state.

[0055] A refrigerant (low-pressure refrigerant) on the low-pressure side of an external refrigerant circuit flows into the first housing chamber 113 that houses the electric motor unit 10 through a refrigerant inlet 117 formed in the front housing 110b. That is, the first housing chamber 113 forms a "suction chamber" into which the low-pressure refrigerant flows in from the outside. Therefore, the pressure in the first housing chamber 113 is approximately the same as the pressure on the low-pressure side of the external refrigerant circuit.

[0056] When electricity is supplied to the electric motor unit 10, the rotating shaft 200 rotates, which causes the first eccentric roller 33A to rotate eccentrically in the first cylinder chamber 32A of the first compression mechanism unit 30A and the second eccentric roller 33B to rotate eccentrically in the second cylinder chamber 32B of the second compression mechanism unit 30B.

[0057] The low-pressure refrigerant that flows into the first housing chamber 113 from the refrigerant inlet 117 passes through a gap between the stator 11 and the rotor 12 of the electric motor unit 10, and thereby the electric motor unit 10 is cooled by the low-pressure refrigerant. Then, the low-pressure refrigerant that passes through the first suction passage 55 and the first suction port (not shown) from the first housing chamber 113 is sucked into the first cylinder chamber 32A. In addition, the low-pressure refrigerant that passes through the first suction passage 55, the second suction passage (not shown) and the second suction port (not shown) from the first housing chamber 113 is sucked into the second cylinder chamber 32B. At this time, the lubricating oil stored in the lower part of the first housing chamber 113 is also sucked into the first cylinder chamber 32A and the second cylinder chamber 32B together with the low-pressure refrigerant. Note that, when the electric rotary compressor RC is an inverter-integrated type, the low-pressure refrigerant that flows into the first housing chamber 113 may cool the inverter in addition to the electric motor unit 10.

[0058] The low-pressure refrigerant sucked into the first cylinder chamber 32A is compressed in the first cylinder chamber 32A by the eccentric rotation of the first eccentric roller 33A to become a high-pressure refrigerant. This high-pressure refrigerant is discharged from the first cylinder chamber 32A through a first discharge port (not shown) and a first communication hole 111d (see FIG. 2) into the first silencing chamber 45A. The high-pressure refrigerant in the first silencing chamber 45A then passes through the communication passage 51 and is discharged into the second silencing chamber 45B.

[0059] The low-pressure refrigerant sucked into the second cylinder chamber 32B is compressed in the second cylinder chamber 32B by the eccentric rotation of the second eccentric roller 33B to become a high-pressure refrigerant. This high-pressure refrigerant is discharged from the second cylinder chamber 32B through a second discharge port (not shown) and the second communication hole 47c (see FIG. 2) into the second silencing chamber 45B.

[0060] The high-pressure refrigerant discharged from the first cylinder chamber 32A and the high-pressure refrigerant discharged from the second cylinder chamber 32B join together in the second muffling chamber 45B and are discharged into the second storage chamber 115 through a discharge port 53 provided in the second closing plate 49 at the rear end of the compression mechanism section 30. That is, the second storage chamber 115 constitutes a "discharge chamber" from which the high-pressure refrigerant (high-pressure refrigerant) compressed in the compression mechanism section 30 is discharged. The pressure in the second storage chamber 115 is approximately the same as the pressure of the high-pressure refrigerant, that is, the pressure on the high-pressure side of the external refrigerant circuit. Therefore, the pressure in the second storage chamber 115 is higher than the pressure in the first storage chamber 113.

[0061] At this time, the discharge port 53 of the high-pressure refrigerant into the second housing chamber 115 extends linearly in the plate thickness direction of the second blocking plate 49 as shown in FIG. 2, and is oriented so that the high-pressure refrigerant collides with the inner wall surface of the rear housing 110c, particularly the end wall. Therefore, the high-pressure refrigerant discharged from the discharge port 53 into the second housing chamber 115 collides with and / or comes into contact with the inner surface of the end wall of the rear housing 110c. Then, the high-pressure refrigerant discharged from the discharge port 53 collides with and / or comes into contact with the inner surface of the end wall of the rear housing 110c, so that some of the lubricating oil is separated from the high-pressure refrigerant. After that, the high-pressure refrigerant from which the lubricating oil has been separated is discharged to the high-pressure side of the external refrigerant circuit through the refrigerant outlet 119 provided on the upper side of the rear housing 110c. Most of the lubricating oil separated from the high-pressure refrigerant moves downward mainly by gravity and is returned to the lower part of the second housing chamber 115 and stored there.

[0062] Refrigerant outlet 119 to the external refrigerant circuit is provided on the upper side of the end portion of rear housing 110c on the center housing 110a side that constitutes second housing chamber 115. Therefore, the high-pressure refrigerant from which the lubricant oil has been separated by collision and / or contact with the inner surface of the end wall of rear housing 110c, and a portion of the separated lubricant oil, flow through the upper space of second housing chamber 115 toward refrigerant outlet 119 on the center housing 110a side. In other words, by arranging refrigerant outlet 119 on the upper side of the end portion on the center housing 110a side, the high-pressure refrigerant from which the lubricant oil has been separated and a portion of the lubricant oil flow through the upper space of second housing chamber 115 from the rear to the front.

[0063] Here, the first vane 35A is provided above the horizontally placed first cylinder 31A, a first back pressure chamber 37A is provided above the first vane 35A, and a first return hole 39A is provided that communicates with the first back pressure chamber 37A and opens upward. The second vane 35B is provided above the horizontally placed second cylinder 31B, a second back pressure chamber 37B is provided above the second vane 35B, and a second return hole 39B is provided that communicates with the second back pressure chamber 37B and opens upward.

[0064] Therefore, the high-pressure refrigerant from which the lubricating oil has been separated and a portion of the lubricating oil pass through the first vane 35A and the second vane 35B, the first back pressure chamber 37A and the second back pressure chamber 37B, and the upper sides of the first return hole 39A and the second return hole 39B. In other words, the first return hole 39A and the second return hole 39B are provided on a path along which the high-pressure refrigerant from the discharge port 53 of the compression mechanism 30 travels toward the refrigerant outlet 119 formed on the upper side of the rear housing 110c after colliding with and / or coming into contact with the inner surface of the end wall of the rear housing 110c.

[0065] With this configuration, part of the lubricating oil separated from the high-pressure refrigerant gradually falls due to gravity while flowing in the upper space of the second storage chamber 115, or comes into contact with the inner surface of the top wall and falls along the inner surface, and flows into the first return hole 39A and the second return hole 39B. Also, the lubricating oil still contained in the high-pressure refrigerant, although in small amounts, comes into contact with the inner surface of the top wall and separates, and similarly flows into the first return hole 39A and the second return hole 39B.

[0066] In this way, a portion of the lubricating oil separated from the high-pressure refrigerant flows into the first return hole 39A and the second return hole 39B by gravity, and is then supplied to the first vane groove and the second vane groove from the first back pressure chamber 37A and the second back pressure chamber 37B. As a result, the lubricating oil is replenished in the clearances around the first vane 35A and the second vane 35B, and the lubricating performance and sealing performance around the first vane 35A and the second vane 35B are maintained.

[0067] Furthermore, since there is a sufficient amount of high-pressure refrigerant in the first back pressure chamber 37A of the first vane 35A and the second back pressure chamber 37B of the second vane 35B, the first vane 35A and the second vane 35B are appropriately pressed against the first eccentric roller 33A and the second eccentric roller 33B by the stable pressure of the high-pressure refrigerant. This prevents the first vane 35A and the second vane 35B from separating from the first eccentric roller 33A and the second eccentric roller 33B, thereby preventing poor compression.

[0068] The electric rotary compressor RC according to the first embodiment has the following [Feature 1] to [Feature 4] as unique features, in addition to the basic configuration described above.

[0069] [Feature 1] Between the compression mechanism 30 and the rear housing 110c that houses it, a vibration-proof member 300 made of, for example, vibration-proof rubber is disposed. The vibration-proof member 300 includes a ring-shaped first vibration-proof member 300A disposed between the outer peripheral surface of the compression mechanism 30, for example, the outer peripheral surface of the sound-absorbing chamber forming member 47, and the inner peripheral surface of the rear housing 110c, and a cylindrical second vibration-proof member 300B disposed between the rear end surface of the compression mechanism 30 and the bottom surface of the rear housing 110c. The first vibration-proof member 300A and the second vibration-proof member 300B are configured to suppress the transmission of vibrations generated in the compression mechanism 30 to the rear housing 110c, that is, to suppress the transmission of vibrations by elasticity and vibration-proofing functions.

[0070] At least one of the first vibration-proofing member 300A and the second vibration-proofing member 300B may be disposed between the compression mechanism 30 and the rear housing 110c. The first vibration-proofing member 300A and the second vibration-proofing member 300B are not limited to the above configuration, and it is desirable to optimize the number and the arrangement position thereof, for example, by testing or simulation with an actual machine. Furthermore, since the ring-shaped first vibration-proofing member 300A divides the second accommodation chamber 115 into two in the front-rear direction, it is desirable to form a plurality of through holes (not shown) penetrating in the plate thickness direction so that the high-pressure refrigerant and the lubricating oil mixed therein can pass through this portion. The first vibration-proofing member 300A and the second vibration-proofing member 300B may be formed integrally. Therefore, it is desirable that the vibration-proofing member 300 has a shape that does not hinder the flow of the refrigerant compressed by the compression mechanism 30 and the lubricating oil mixed therein, regardless of the shapes of the first vibration-proofing member 300A and the second vibration-proofing member 300B.

[0071] [Feature 2] A seal member 302 made of an elastic material is further disposed between the center housing 110a and the rear housing 110c. The seal member 302 ensures the sealing performance of the joint surface between the center housing 110a and the rear housing 110c, and suppresses the transmission of vibration from the rear housing 110c to the center housing 110a. For example, an O-ring can be used as the seal member 302.

[0072] [Feature 3] Between the housing 110 including the center housing 110a, the front housing 110b, and the rear housing 110c and the mounting surface MS to which the housing 110 is attached, a vibration-proof member 304 made of, for example, vibration-proof rubber is further arranged. Here, when the electric rotary compressor RC is to be attached to a vehicle such as an automobile, the mounting surface MS can be the body of the vehicle. The vibration-proof member 304 includes a third vibration-proof member 304A arranged between the center housing 110a and the mounting surface MS, and a fourth vibration-proof member 304B arranged between the rear housing 110c and the mounting surface MS. The third vibration-proof member 304A and the fourth vibration-proof member 304B are configured to suppress the transmission of vibration of the electric rotary compressor RC to the mounting surface MS, that is, to suppress the transmission of vibration by elasticity and vibration-proofing functions. The vibration-proof member 304 (the third vibration-proof member 304A and the fourth vibration-proof member 304B) can be cited as an example of another vibration-proof member.

[0073] [Feature 4] As described above, the rear housing 110c is formed with a larger diameter than the front housing 110b, that is, the partition wall 111 formed in the center housing 110a arranged concentrically therewith, and the refrigerant outlet 119 is formed on the upper side of the end portion on the partition wall 111 side. Also, as shown in Figs. 1 and 2, the rear housing 110c is arranged at a position offset by a predetermined distance downward from the central axis of the partition wall 111 formed integrally with the center housing 110a. In this case, since the rear end side of the center housing 110a and the opening end side of the rear housing 110c do not coincide with each other, a wall portion extending radially inward from the opening end side of the rear housing 110c is formed integrally, and its tip portion is joined to the outer peripheral surface of the center housing 110a. Here, as shown in Fig. 2, the top surface of the center housing 110a and the top surface of the rear housing 110c are at the same height, but the top surfaces of both may be slightly offset from each other. The rear housing 110c is not limited to the configuration in which it is disposed at a position offset a predetermined distance downward from the central axis of the front housing 110b, and may be formed in a shape that can achieve the same action and effect as this configuration.

[0074] Here, the actions and effects obtained by incorporating the above-mentioned [Feature 1] to [Feature 4] into the electric rotary compressor RC will be described.

[0075] [Feature 1] Since the vibration-proof member 300 is disposed between the compression mechanism 30 and the rear housing 110c, vibrations generated in the compression mechanism 30 due to the eccentric rotation of the first eccentric roller 33A and the second eccentric roller 33B are transmitted to the rear housing 110c while being suppressed and damped by the vibration-proof member 300. Therefore, the vibrations transmitted from the compression mechanism 30 to the rear housing 110c are reduced, and as a result, the NV performance of the electric rotary compressor RC can be improved.

[0076] [Feature 2] Since the seal member 302 is disposed between the center housing 110a and the rear housing 110c, vibrations transmitted from the compression mechanism 30 to the rear housing 110c are transmitted to the center housing 110a while being suppressed and attenuated by the seal member 302. Therefore, the vibrations transmitted from the compression mechanism 30 to the center housing 110a via the rear housing 110c are further reduced, and the NV performance of the electric rotary compressor RC can be further improved.

[0077] [Feature 3] Since the vibration-isolating members 304 are disposed between the housing 110 of the electric rotary compressor RC and the mounting surface MS, the vibration of the electric rotary compressor RC is transmitted to the mounting surface MS of the vehicle body while being suppressed and attenuated by the vibration-isolating members 304. This reduces the vibration transmitted from the electric rotary compressor RC to the vehicle body, and it is possible to prevent, for example, the vehicle body side from experiencing increased vibration and noise due to resonance. Here, the vibration-isolating members 304 are not limited to the above configuration, and it is preferable to optimize the number and arrangement positions of the vibration-isolating members 304 through, for example, testing on an actual machine, simulations, etc.

[0078] [Feature 4] Since the rear housing 110c is formed to have a larger diameter than the front housing 110b and is disposed at a position offset downward by a predetermined distance with respect to the central axis of the front housing 110b, the following actions and effects can be achieved. That is, in the general technology, as shown in the left diagram of FIG. 3, the compression mechanism 30 and the rear housing 110c are disposed concentrically, so that the cylindrical space formed by the outer peripheral surface of the compression mechanism 30 and the inner peripheral surface of the rear housing 110c is symmetrical about the axis. However, in the first embodiment, since the rear housing 110c is offset downward by a predetermined distance, the cross-sectional area of ​​the passage of the high-pressure refrigerant toward the refrigerant outlet 119 is smaller than that of the general technology, while the amount of lubricating oil that can be stored in the lower part of the second storage chamber 115 is increased, as shown in the right diagram of FIG. 3.

[0079] Therefore, the high-pressure refrigerant flowing through the upper space of the second storage chamber 115 toward the refrigerant outlet 119 has more opportunities to come into contact with and / or collide with the outer circumferential surface of the compression mechanism 30 and the inner circumferential surface of the rear housing 110c, thereby improving the separation capability of separating the lubricant from the high-pressure refrigerant. Here, the lubricant separated from the high-pressure refrigerant in the upper space of the second storage chamber 115 moves downward by gravity and is returned to the lower part of the second storage chamber 115 and stored there. Therefore, the absolute amount of lubricant taken out from the electric rotary compressor RC to the external refrigerant circuit is reduced, and it is possible to suppress, for example, a decrease in performance due to the lubricant adhering to components of the refrigerant circuit.

[0080] Furthermore, since the amount of lubricating oil that can be stored in the lower part of the second housing chamber 115 increases, even if the oil level OL of the lubricating oil temporarily drops for some reason, the lower part of the compression mechanism part 30 remains immersed in the lubricating oil. Therefore, it is possible to suppress any influence on the lubrication and sealing of the bearing part of the compression mechanism part 30 and the rotating shaft 200.

[0081] 4 and 5 show a second embodiment of a horizontally-mounted electric rotary compressor RC to which the present invention is applied. The electric rotary compressor RC according to the second embodiment has a basic configuration in common with the electric rotary compressor RC according to the first embodiment, and therefore a description thereof will be omitted. For the basic configuration of the electric rotary compressor RC, please refer to the description of the first embodiment, if necessary.

[0082] The electric rotary compressor RC according to the second embodiment has the following [Feature 5] to [Feature 8] as unique configurations.

[0083] [Feature 5] Between the compression mechanism 30 and the rear housing 110c that houses it, a vibration-proof member 300 made of, for example, vibration-proof rubber is disposed. This [Feature 5] is similar to [Feature 1] of the electric rotary compressor RC according to the first embodiment, and the action and effect are also the same, so a detailed description thereof will be omitted. If necessary, please refer to the description of the electric rotary compressor RC according to the first embodiment.

[0084] [Feature 6] A seal member 302 made of an elastic material is further disposed between the center housing 110a and the rear housing 110c. This [Feature 6] is similar to [Feature 2] of the electric rotary compressor RC according to the first embodiment, and the action and effect are also the same, so a detailed description thereof will be omitted. If necessary, please refer to the description of the electric rotary compressor RC according to the first embodiment.

[0085] [Feature 7] Between the center housing 110a and the rear housing 110c and the mounting surface MS of the electric rotary compressor RC, there is further disposed a vibration-proof member 304 made of, for example, vibration-proof rubber. This [Feature 7] is similar to [Feature 3] of the electric rotary compressor RC according to the first embodiment, and the action and effect are also the same, so a detailed description thereof will be omitted. If necessary, please refer to the description of the electric rotary compressor RC according to the first embodiment.

[0086] [Feature 8] As described above, the rear housing 110c is formed with a larger diameter than the front housing 110b, that is, the partition wall 111 formed in the center housing 110a arranged concentrically therewith. The rear housing 110c is arranged concentrically with the partition wall 111 of the center housing 110a, and the opening end side of the rear housing 110c on the partition wall 111 side extends beyond the partition wall 111 of the center housing 110a to the boundary with the first housing chamber 113. Therefore, the opening end side of the rear housing 110c on the partition wall 111 side overlaps the outer circumferential surface of the partition wall 111 of the front housing 110b from the boundary with the first housing chamber 113 to the position of the partition wall 111 on the second housing chamber 115 side. In this case, since the rear end side of the center housing 110a and the opening end side of the rear housing 110c do not coincide with each other, a wall portion extending radially inward from the opening end side of the rear housing 110c is integrally formed, and its tip portion is joined to the outer peripheral surface of the center housing 110a via a sealing member 302.

[0087] Due to this [Feature 8], the cross-sectional area of ​​the high-pressure refrigerant passage passing through the upper space of the second storage chamber 115 and heading toward the refrigerant outlet 119 decreases sharply at a position corresponding to the rear end surface of the partition portion 111, as shown in Figure 5, while the amount of lubricating oil that can be stored in the lower part of the second storage chamber 115 increases.

[0088] Therefore, the high-pressure refrigerant flowing through the upper space of the second storage chamber 115 toward the refrigerant outlet 119 has more opportunities to come into contact with and / or collide with the outer peripheral surface of the partition wall 111 and the inner peripheral surface of the rear housing 110c, thereby improving the separation ability of separating the lubricant from the high-pressure refrigerant. In addition, the distance that the high-pressure refrigerant discharged from the compression mechanism unit 30 to the second storage chamber 115 travels to the refrigerant outlet 119 is longer, which also improves the separation ability of separating the lubricant from the high-pressure refrigerant. Furthermore, since the opening end side on the partition wall 111 side of the rear housing 110c extends to the boundary with the first storage chamber 113, it is not heated by the temperature of the low-pressure refrigerant in the first storage chamber 113, and a decrease in the compression efficiency of the low-pressure refrigerant by the compression mechanism unit 30 can be suppressed.

[0089] The lubricating oil separated from the high-pressure refrigerant in the upper space of the second storage chamber 115 moves downward by gravity and is returned to and stored in the lower part of the second storage chamber 115. For this reason, at least one oil return groove (not shown) extending in the circumferential direction may be formed on the outer circumferential surface of the partition wall portion 111 of the center housing 110a in order to secure an oil passage through which the lubricating oil is returned to the lower part of the second storage chamber 115. In this way, the efficiency with which the lubricating oil returns to the lower part of the second storage chamber 115 is improved, and the area of ​​contact between the high-pressure refrigerant and the partition wall portion 111 is increased, improving the separation ability.

[0090] Therefore, the absolute amount of lubricating oil taken out from the electric rotary compressor RC to the external refrigerant circuit is reduced, and it is possible to suppress, for example, a decrease in performance due to the lubricating oil adhering to components of the refrigerant circuit.

[0091] Furthermore, since the amount of lubricating oil that can be stored in the lower part of the second housing chamber 115 increases, even if the oil level OL of the lubricating oil temporarily drops for some reason, the lower part of the compression mechanism part 30 remains immersed in the lubricating oil. Therefore, it is possible to suppress any influence on the lubrication and sealing of the bearing part of the compression mechanism part 30 and the rotating shaft 200.

[0092] Furthermore, a person skilled in the art will easily understand that new embodiments can be created by omitting parts of the technical ideas of the various above-mentioned embodiments, combining parts of them appropriately, or replacing parts of them with well-known technology.

[0093] As one example, the first vane 35A and the second vane 35B of the compression mechanism 30 are not limited to being provided above the first cylinder 31A and the second cylinder 31B, but may be provided below them. In this way, the first vane 35A and the second vane 35B are immersed in the lubricating oil stored in the lower part of the second housing chamber 115, and therefore can exhibit their lubricating and sealing performance.

[0094] Furthermore, the present invention is not limited to the electric rotary compressor RC, but can also be applied to various compressors that are well known to those skilled in the art, such as swash plate compressors, diaphragm compressors, screw compressors, and rotary piston compressors, which use an electric motor as a drive source. [Explanation of symbols]

[0095] RC…Electric rotary compressor (electric compressor) MS…Mounting surface 10...Electric motor section 30...Compression mechanism 31A…First cylinder (cylinder) 31B…Second cylinder (cylinder) 33A…First eccentric roller (eccentric roller) 33B...Second eccentric roller (eccentric roller) 35A…First vane (vane) 35B…Second vane (vane) 53…Discharge port 110…Housing 110b…Front housing 110c…rear housing 111...Partition wall part 200…Rotation axis 300...Vibration-proof member 300A…First vibration-proof member 300B…Second vibration isolating member 302...Sealing material 304... Vibration-proofing material (other vibration-proofing material)

Claims

1. A horizontally disposed rotation axis; an electric motor unit that rotates the rotary shaft; A compression mechanism driven by the rotary shaft; a front housing that accommodates the electric motor unit; a rear housing that accommodates the compression mechanism; a partition portion that supports the rotating shaft in a rotatable and sealed state and is disposed between an open end side of the front housing and an open end side of the rear housing; a vibration isolating member disposed between the compression mechanism and the rear housing; An electric compressor having

2. a seal member made of an elastic material is further disposed between the opening end side of the rear housing and the partition wall. The electric compressor according to claim 1 .

3. the vibration-isolating member includes at least one of a first vibration-isolating member disposed between an outer circumferential surface of the compression mechanism and an inner circumferential surface of the rear housing, and a second vibration-isolating member disposed between an axial end face of the compression mechanism and a bottom surface of the rear housing, The electric compressor according to claim 1 .

4. The first vibration-proof member has a shape that does not interfere with the flow of the refrigerant compressed by the compression mechanism and the lubricating oil mixed in the refrigerant. The electric compressor according to claim 1 .

5. a vibration-isolating member different from the vibration-isolating member is further disposed between a housing including the front housing, the rear housing, and the partition portion and a mounting surface for mounting the housing; The electric compressor according to claim 1 .

6. The compression mechanism includes a horizontally disposed cylinder, an eccentric roller that rotates eccentrically inside the cylinder by the rotating shaft, a vane that divides the inside of the cylinder into a low pressure chamber and a high pressure chamber, and a discharge port that discharges high pressure refrigerant from the high pressure chamber into the rear housing. The electric compressor according to any one of claims 1 to 5.

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