JP2021042686A - Horizontal electric compressor - Google Patents

Abstract

To provide a horizontal electric compressor capable of securing a sufficient amount of lubricant at a compression mechanism portion side even in being inclined, and sufficiently supplying the lubricant to each of slide portions of the compression mechanism portion and a bearing portion of a rotating shaft.SOLUTION: In a horizontal electric compressor, the inside of a housing 110 is divided into a first storage chamber 113 for storing an electric motor portion 10 and a second storage chamber 115 for storing a compression mechanism portion 30, and the compression mechanism portion 30 sucks and compresses a low-pressure refrigerant in the first storage chamber 113 through a suction passage, and discharges the same to the second storage chamber 115, an oil supply passage 70 supplies a lubricant O to a first shaft hole 111b as a bearing portion of a rotating shaft 200 by utilizing pressure difference between the second storage chamber 115 and the first storage chamber 113, and an oil return member 80 is disposed in adjacent to an end portion at the first storage chamber 113 side, of the first shaft hole 111b to guide the lubricant O having passed through the first shaft hole 111b, to an inlet-side end portion of the suction passage opened to the first storage chamber 113.SELECTED DRAWING: Figure 1

Description

The present invention relates to a horizontal electric compressor, and more particularly to a horizontal electric compressor that can be suitably used as a compressor installed in a moving body such as an automobile.

As an example of this type of horizontal electric compressor, the horizontal rotary compressor described in Patent Document 1 is known. In the horizontal rotary compressor, the inside of the closed container is partitioned by a partition member into an oil storage space where the compression mechanism is located and a space on the motor side where the motor is located. Further, the horizontal rotary compressor is an oil supply passage including a center hole provided in the rotating shaft, an oil guide hole for communicating the center hole and each sliding portion of the compression mechanism portion, and an oil suction pipe. have. The oil supply passage is configured to suck up the lubricating oil in the oil storage space and supply it to each sliding portion of the compression mechanism by utilizing the pressure difference between the oil storage space and the center hole. There is.

Japanese Unexamined Patent Publication No. 2004-60533

However, in the horizontal rotary compressor, the oil storage space and the motor side space communicate with each other through an oil communication hole provided in the lower part of the partition member. Therefore, for example, when the horizontal rotary compressor is tilted in a direction in which the space on the motor side is lower than that on the space side of the oil storage portion, the lubricating oil may be biased toward the space on the motor side. Further, in the horizontal rotary compressor, when the lubricating oil comes into contact with the rotor of the electric motor portion, the lubricating oil in the closed container is agitated by the rotor, and the refrigeration cycle is performed from the horizontal rotary compressor together with the discharged refrigerant. It leaks to. For this reason, the lubricating oil in the closed container is insufficient, and sufficient lubrication cannot be supplied to each sliding portion of the compression mechanism portion and the main bearing, and there is a possibility that galling or seizure may occur in the compression mechanism portion.

Therefore, according to the present invention, it is possible to secure a sufficient amount of lubricating oil on the compression mechanism side even when tilted, etc., and sufficiently lubricate each sliding portion of the compression mechanism and the bearing portion of the rotating shaft. It is an object of the present invention to provide a horizontal electric compressor capable of providing a horizontal electric compressor.

According to one aspect of the present invention, a horizontal electric compressor is provided. The horizontal electric compressor has an electric motor unit that rotates a rotating shaft in a housing and a compression mechanism unit that is driven via the rotating shaft. In the horizontal electric compressor, the rotating shaft is rotatable. A bearing portion of the rotating shaft is provided between the electric motor portion and the compression mechanism portion. Further, the horizontal electric compressor has a housing in a first accommodation chamber for accommodating the electric motor portion and a second accommodation chamber for accommodating the compression mechanism portion and having a pressure higher than the pressure of the first accommodation chamber. A partition wall portion for partitioning the inside and an oil supply passage for supplying lubricating oil to the bearing portion, one end of which is located in the second accommodating chamber and the other end side of the bearing portion via the bearing portion. It has the oil supply passage which communicates with the first accommodation chamber and is configured to supply the lubricating oil to the bearing portion by utilizing the pressure difference between the second accommodation chamber and the first accommodation chamber. .. The compression mechanism unit is configured to suck the low-pressure refrigerant in the first storage chamber through the suction passage, compress the refrigerant, and discharge the low-pressure refrigerant into the second storage chamber. An oil return member that guides the lubricating oil that has passed through the bearing portion to the inlet-side end of the suction passage that opens into the first accommodating chamber is provided adjacent to the end of the bearing portion on the first accommodating chamber side. ..

According to one aspect of the present invention, it is possible to secure a sufficient amount of lubricating oil on the compression mechanism side even when tilted, and to lubricate each sliding part of the compression mechanism and the bearing part of the rotating shaft. It is possible to provide a horizontal electric compressor that can be sufficiently performed.

It is sectional drawing of the horizontal type electric compressor which concerns on one Embodiment of this invention. It is an enlarged view of the main part of FIG. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a cross-sectional view of BB of FIG. FIG. 3 is a cross-sectional view taken along the line CC of FIG. FIG. 5 is a cross-sectional view taken along the line DD of FIG. FIG. 5 is a sectional view taken along the line EE of FIG. FIG. 7 is a diagram showing a state in which the oil return member is omitted in FIG. 7. It is a figure which shows the oil-returning member, (a) is the front view of the oil-returning member 80, and (b) is the FF sectional view of (a). It is a figure which shows the flow of the refrigerant (gas) in the horizontal type electric compressor. It is a figure which shows the flow of the lubricating oil in the horizontal type electric compressor.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a horizontal electric compressor according to an embodiment of the present invention. The horizontal electric compressor (hereinafter, simply referred to as “electric compressor”) 100 according to the embodiment has a housing 110. The housing 110 has a cylindrical center housing 110a, a bottomed cylindrical front housing 110b whose open end side is joined to the front end (left end in FIG. 1) of the center housing 110a, and a rear end (open end side) of the center housing 110a (the open end side). Includes a bottomed cylindrical rear housing 110c joined to the right end in FIG. 1).

The inside of the housing 110 is divided into a first storage chamber 113 on the front housing 110b side and a second storage chamber 115 on the rear housing 110c side by a partition wall portion 111 integrally provided with the center housing 110a. The first accommodation chamber 113 is formed by the center housing 110a and the front housing 110b, and the second accommodation chamber 115 is formed by the center housing 110a and the rear housing 110c.

A boss portion 111a projecting toward the first storage chamber 113 is formed at the radial center portion of the partition wall portion 111. Further, the partition wall portion 111 is formed with a first shaft hole 111b that penetrates from the tip surface of the boss portion 111a to the surface on the second accommodation chamber 115 side.

An intermediate portion of the rotating shaft 200 extending in the horizontal direction (front-rear direction) is rotatably inserted into the first shaft hole 111b. One end (front end) side of the rotating shaft 200 is located in the first accommodating chamber 113, and the other end (rear end) side of the rotating shaft 200 is located in the second accommodating chamber 115. A minute gap (clearance) CL is formed between the inner peripheral surface of the first shaft hole 111b and the outer peripheral surface of the rotating shaft 200. The minute gap CL is set so that the rotating shaft 200 can rotate and can be sealed by the lubricating oil O described later.

The electric motor unit 10 for rotating the rotating shaft 200 is housed in the first storage chamber 113. Further, the first accommodation chamber 113 communicates with the low pressure side of an external refrigerant circuit (not shown) via a suction port 117 formed in the front housing 110b. The suction port 117 is located at a position opposite to the partition wall portion 111 across the electric motor portion 10 in the axial direction of the rotating shaft 200, and at a position corresponding to the rotating shaft 200 in the height (upper and lower) direction (that is, the rotating shaft). It is provided at a position (at almost the same height as 200).

The electric motor unit 10 includes a stator 11 and a rotor 12.

The stator 11 is fixed to the inner peripheral surface of the housing 110. Specifically, the stator 11 is fixed to the inner peripheral surface of a portion of the center housing 110a on the front housing 110b side of the partition wall portion 111. The stator 11 has a stator core 11a formed of a magnetic material in a cylindrical shape, and a stator coil 11b wound around the stator core 11a (the teeth portion) by, for example, concentrated winding.

The rotor 12 is arranged with a predetermined gap inside the stator 11 in the radial direction. A permanent magnet is incorporated in the rotor 12. The rotor 12 is formed in a cylindrical shape, and is fixed to the rotating shaft 200 with the front end side of the rotating shaft 200 inserted through the hollow portion thereof.

In the electric motor portion 10, the rotor 12 is rotated by supplying electric power to the stator 11 (stator coil 11b) via the airtight terminal portion 20 provided in the front housing 110b, whereby the rotating shaft 200 is rotated. It is configured in.

Further, in the first storage chamber 113, an oil return member is used to return the lubricating oil O that has passed through the first shaft hole 111b from the second storage chamber 115 side toward the first storage chamber 113 to the second storage chamber 115 side. 80 is provided. In the present embodiment, the oil return member 80 is provided adjacent to the end portion of the first shaft hole 111b on the first storage chamber 113 side. More specifically, the oil return member 80 is attached to the boss portion 111a formed on the partition wall portion 111. The oil return member 80 will be described later.

The compression mechanism unit 30 driven via the rotating shaft 200 is housed in the second storage chamber 115. The compression mechanism unit 30 is configured as a rotary compressor. However, the present invention is not limited to this, and the compression mechanism unit 30 may be configured as a compressor other than the rotary compressor. The second storage chamber 115 communicates with the high pressure side of the external refrigerant circuit via a discharge port 119 formed in the rear housing 110c. The discharge port 119 is provided at a position on the partition wall 111 side of the discharge hole 53 described later in the axial direction of the rotary shaft 200, and at a position corresponding to the rotary shaft 200 in the height direction like the suction port 117. There is.

The bottom of the second storage chamber 115 constitutes a lubricating oil storage portion in which the lubricating oil O is stored. In other words, in the present embodiment, the lubricating oil O is mainly stored in the second storage chamber 115, and is hardly stored in the first storage chamber 113.

The compression mechanism portion 30 has an outer diameter smaller than the inner diameter of the housing 110. Further, the lower portion of the compression mechanism portion 30 is immersed in the lubricating oil O (that is, it is located below the oil level of the lubricating oil O).

The compression mechanism unit 30 includes a first compression mechanism unit 30A and a second compression mechanism unit 30B arranged on both sides of the intermediate partition plate 40. The first compression mechanism portion 30A is arranged on the partition wall portion 111 side (that is, the front side) of the intermediate partition plate 40, and the second compression mechanism portion 30B is on the side opposite to the partition wall portion 111 side of the intermediate partition plate 40 (that is, the front side). That is, it is arranged on the rear side). An insertion hole through which the rotating shaft 200 is inserted is formed in the radial center portion of the intermediate partition plate 40.

FIG. 2 is an enlarged view of a main part of FIG. 1, and mainly shows a compression mechanism part 30. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1 and mainly shows the configuration of the first compression mechanism portion 30A. FIG. 4 is a cross-sectional view taken along the line BB of FIG. 1, and the configuration is mainly shown in the second compression mechanism portion 30B.

As shown in FIGS. 2 and 3, the first compression mechanism unit 30A includes a first cylinder 31A, a first eccentric roller 33A, and a first vane 35A.

One surface (front surface) of the first cylinder 31A is in close contact with the surface of the partition wall 111 on the second accommodating chamber 115 side, and the other surface (rear surface) of the first cylinder 31A is medium. It is in close contact with the partition plate 40. The first cylinder 31A has a first cylinder chamber 37A having a circular cross section at the center in the radial direction.

The first eccentric roller 33A is attached to the first eccentric portion 201 of the rotating shaft 200 located in the first cylinder chamber 37A of the first cylinder 31A. The first eccentric roller 33A eccentrically rotates in the first cylinder chamber 37A of the first cylinder 31A as the rotating shaft 200 rotates.

The first vane 35A is urged toward the first eccentric roller 33A by the first urging member (coil spring) 39A. The first vane 35A abuts on the outer peripheral surface of the first eccentric roller 33A and divides the inside of the first cylinder chamber 37A into a low pressure chamber where the first suction port 41A is located and a high pressure chamber where the first discharge port 43A is located. (See FIG. 3). The first suction port 41A and the first discharge port 43A are provided below the rotating shaft 200.

Further, in the present embodiment, a first recess 111c is formed on the surface of the partition wall 111 on the side of the first storage chamber 113 so as to surround the boss portion 111a. Then, the opening of the first recess 111c is closed by the first closing plate 121 which is in close contact with the surface of the partition wall 111 on the side of the first storage chamber 113, whereby the first discharge sound deadening partitioned from the first storage chamber 113 is closed. A chamber 45A is formed. That is, in the present embodiment, the partition wall portion 111 is provided with the first discharge muffling chamber 45A. The first discharge muffling chamber 45A is a first discharge port 43A (see FIG. 3) located in a high pressure chamber in the first cylinder chamber 37A of the first cylinder 31A through the first communication hole 111d formed in the partition wall portion 111. ).

The second compression mechanism unit 30B has the same configuration as the first compression mechanism unit 30A. That is, the second compression mechanism unit 30B includes a second cylinder 31B, a second eccentric roller 33B, and a second vane 35B.

One surface (front surface) of the second cylinder 31B is in close contact with the intermediate partition plate 40. One surface of the discharge muffling chamber forming member 47 is in close contact with the other side surface (rear side surface) of the second cylinder 31B. The second cylinder 31B has a second cylinder chamber 37B having a circular cross section at the center in the radial direction.

The second eccentric roller 33B is attached to the second eccentric portion 202 of the rotating shaft 200 located in the second cylinder chamber 37B of the second cylinder 31B. The second eccentric roller 33B eccentrically rotates in the second cylinder chamber 37B of the second cylinder 31B as the rotating shaft 200 rotates. The second eccentric portion 202 is provided on the rotating shaft 200 with a phase difference of about 180 ° (with a phase difference of about 180 °) with respect to the first eccentric portion 201.

The second vane 35B is urged toward the second eccentric roller 33B by the second urging member (coil spring) 39B. The second vane 35B abuts on the outer peripheral surface of the second eccentric roller 33B and divides the inside of the second cylinder chamber 37B into a low pressure chamber where the second suction port 41B is located and a high pressure chamber where the second discharge port 43B is located. (See FIG. 4). The second suction port 41B and the second discharge port 43B are provided below the rotation shaft 200, like the first suction port 41A and the first discharge port 43A.

A second shaft hole 47a is formed in the radial center portion of the discharge muffling chamber forming member 47. The rear end portion of the rotating shaft 200 and its vicinity are rotatably inserted into the second shaft hole 47a. That is, the rotary shaft 200 is rotatably supported by the first shaft hole 111b formed in the partition wall 111 and the second shaft hole 47a formed in the discharge muffling chamber forming member 47, and these first shaft holes are rotatably supported. 111b and the second shaft hole 47a each form a bearing portion of the rotating shaft 200. As in the case of 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.

Further, a second recess 47b is formed on the surface of the discharge sound deadening chamber forming member 47 opposite to the second cylinder 31B side (that is, the rear surface) so as to surround the second shaft hole 47a. .. The second discharge muffling chamber 45B is formed by closing the second recess 47b with the second closing plate 49 which is in close contact with the surface of the discharge muffling chamber forming member 47 on the side opposite to the second cylinder 31B. .. The second discharge muffling chamber 45B is connected to the second discharge port 43B located in the high pressure chamber in the second cylinder chamber 37B of the second cylinder 31B via the second communication hole 47c formed in the discharge muffling chamber forming member 47. Communicating.

Here, in the present embodiment, the first closing plate 121, the first cylinder 31A, the intermediate partition plate 40, the second cylinder 31B, the discharge sound deadening chamber forming member 47, and the second closing plate 49 are a plurality of fastening members (for example, through). It is fastened by a bolt) 60 and fixed to the partition wall 111. In other words, in the present embodiment, the compression mechanism portion 30 (first compression mechanism portion 30A, second compression mechanism portion 30B) is attached to and fixed to the partition wall portion 111.

5 is a sectional view taken along the line CC of FIG. 3, FIG. 6 is a sectional view taken along the line DD of FIG. 5, FIG. 7 is a sectional view taken along the line EE of FIG. No. 7 shows a state in which the oil return member 80 is omitted.

In the present embodiment, the first discharge muffling chamber 45A and the second discharge muffling chamber 45B communicate with each other via a discharge communication passage 51 provided above the rotating shaft 200. The discharge communication passage 51 forms the bottom wall portion of the first recess 111c forming the first discharge muffling chamber 45A, the first cylinder 31A, the intermediate partition plate 40, the second cylinder 31B, and the second discharge muffling chamber 45B. It is formed as a passage extending horizontally through the bottom wall portion of the second recess 47b. Further, the second discharge muffling chamber 45B communicates with the second accommodation chamber 115 via a discharge hole 53 formed in the second closing plate 49 (see FIGS. 5 and 6).

The first suction port 41A located in the low pressure chamber in the first cylinder chamber 37A of the first cylinder 31A communicates with the first storage chamber 113 via the first suction passage 55 provided below the rotating shaft 200. ing. In the present embodiment, the first suction passage 55 extends from the first suction port 41A in the first cylinder 31A downward in the circumferential direction, and then horizontally extends in the vicinity of the bottom portion in the housing 110 in the partition wall portion 111 and the first closing plate 121. Is formed as a passage leading to the first accommodation chamber 113. Further, the inlet-side end 55a of the first suction passage 55 that opens into the first storage chamber 113 is vertically below the first shaft hole 111b and near the bottom of the first storage chamber 113 (that is, the first storage chamber 113). It is located near the bottom of 113 (see FIGS. 2, 3, 5, and 8).

The second suction port 41B located in the low pressure chamber in the second cylinder chamber 37B of the second cylinder 31B extends from the second suction port 41B in the second cylinder 31B downward in the circumferential direction and then horizontally as an intermediate partition plate 40. The second suction passage 56 and the first suction passage 55, which penetrate the first suction passage 55 and connect to the first suction passage 55, communicate with the first storage chamber 113 (see FIGS. 5 and 8).

Further, in the electric compressor 100, each slide of the bearing portion (first shaft hole 111b, second shaft hole 47a) and the compression mechanism portion 30 (first compression mechanism portion 30A, second compression mechanism portion 30B) of the rotating shaft 200 It has an oil supply passage 70 for supplying lubricating oil to the moving portion. In the present embodiment, the oil supply passage 70 includes a first oil passage 71 formed inside the second closing plate 49, and a second oil passage 72 extending inside the rotating shaft 200 in the axial direction of the rotating shaft 200. Includes first to fourth oil guide holes 73 to 76 extending radially inside the rotating shaft 200 (see FIGS. 1, 2 and 6).

One end (lower end) of the first oil passage 71 opens to the bottom of the second closing plate 49 and extends upward, and then bends toward the rear end surface of the rotating shaft 200, and the other end (upper end) is the second shaft hole. It is formed as a passage that opens in 47a. Specifically, in the present embodiment, the first oil passage 71 has a vertical hole extending vertically from the bottom of the second closing plate 49 to a position corresponding to the rotation shaft 200, and a discharge muffling chamber of the second closing plate 49. It is composed of a horizontal hole extending horizontally from a portion of the surface on the member 47 side corresponding to the second shaft hole 47a and connecting to the vertical hole. The one end (lower end) of the first oil passage 71, that is, the opening of the vertical hole is the lubricating oil stored in the vicinity of the bottom of the second storage chamber 115, more specifically, in the bottom of the second storage chamber 115. It is located below the liquid level of O and functions as an oil suction port.

One end of the second oil passage 72 opens to the rear end surface of the rotating shaft 200, and the position inside the rotating shaft 200 exceeds the first cylinder 31A along the axis of the rotating shaft 200 (in other words, the first shaft hole). It extends to a position corresponding to the inside of 111b) and the other end is closed. The one end of the second oil passage 72 is connected to the other end (upper end) of the first oil passage 71, and the first oil passage 71 and the second oil passage 72 form one passage. The second oil passage 72 corresponds to the "passage in the rotating shaft" of the present invention.

One end of the first oil guide hole 73 opens in the second oil passage 72 and the other end extends radially in the rotary shaft 200 and the other end opens in the outer peripheral surface of the rotary shaft 200 located in the second shaft hole 47a. ing. More specifically, the other end of the first oil guide hole 73 is open to the outer peripheral surface of the rotating shaft 200 located at a portion adjacent to the second cylinder 31B in the second shaft hole 47a. In other words, the first oil guide hole 73 communicates with the second oil passage 72 and a minute gap formed between the outer peripheral surface of the rotating shaft 200 and the inner peripheral surface of the second shaft hole 47a. There is. Here, of the outer peripheral surface of the rotating shaft 200 located in the second shaft hole 47a, the portion where the other end of the first oil guide hole 73 opens is slightly reduced in diameter as compared with the other portions. Functions as a lubricating oil reservoir.

One end of the second oil guide hole 74 opens in the second oil passage 72 and extends in the rotating shaft 200 in the radial direction, and the other end opens on the outer peripheral surface of the second eccentric portion 202 of the rotating shaft 200. Here, of the outer peripheral surface of the second eccentric portion 202, the portion where the other end of the second oil guide hole 74 opens is a flat surface, and the outer peripheral surface of the second eccentric portion 202 and the second eccentric roller 33B A minute gap is formed between the inner peripheral surface of the surface and the inner peripheral surface of the surface. That is, the second oil guide hole 74 communicates the second oil passage 72 with the minute gap formed between the outer peripheral surface of the second eccentric portion 202 and the inner peripheral surface of the second eccentric roller 33B. There is.

One end of the third oil guide hole 75 opens in the second oil passage 72 and extends in the rotating shaft 200 in the radial direction, and the other end opens on the outer peripheral surface of the first eccentric portion 201 of the rotating shaft 200. Here, similarly to the second eccentric portion 202, the portion of the outer peripheral surface of the first eccentric portion 201 where the other end of the third oil guide hole 75 opens is a flat surface, and the first eccentric roller 33A A slight gap is formed between the inner peripheral surface of the surface and the inner peripheral surface of the surface. That is, the third oil guide hole 75 communicates the second oil passage 72 with the minute gap formed between the outer peripheral surface of the first eccentric portion 201 and the inner peripheral surface of the first eccentric roller 33A. There is.

One end of the fourth oil guide hole 76 opens in the second oil passage 72 and the other end extends radially in the rotary shaft 200 and the other end opens in the outer peripheral surface of the rotary shaft 200 located in the first shaft hole 111b. ing. More specifically, the other end of the fourth oil guide hole 76 is open to the outer peripheral surface of the rotating shaft 200 located at a portion adjacent to the first cylinder 31A in the first shaft hole 111b. In other words, the fourth oil guide hole 76 communicates the second oil passage 72 with the minute gap CL formed between the outer peripheral surface of the rotating shaft 200 and the inner peripheral surface of the first shaft hole 111b. ing. Here, of the outer peripheral surface of the rotating shaft 200 located in the first shaft hole 111b, the portion where the other end of the fourth oil guide hole 76 opens is slightly reduced in diameter as compared with the other portions. Functions as a lubricating oil reservoir. The fourth oil guide hole 76 corresponds to the "communication hole" of the present invention.

Here, the oil return member 80 will be described mainly with reference to FIGS. 2, 7, and 9. In the present embodiment, the oil return member 80 is formed between the lubricating oil O that has passed through the first shaft hole 111b, more specifically, the outer peripheral surface of the rotating shaft 200 and the inner peripheral surface of the first shaft hole 111b. It is configured to guide the lubricating oil O that has passed through the minute gap CL to the inlet side end portion 55a of the first suction passage 55.

FIG. 9 shows the oil return member 80. 9 (a) is a front view of the oil return member 80, and FIG. 9 (b) is a sectional view taken along the line FF of FIG. 9 (a).

As shown in FIGS. 9A and 9B, the oil return member 80 has a catching portion 81 formed in a bottomed cylindrical shape and having an insertion hole 81a in which the rotating shaft 200 is inserted at the bottom, and a catching portion 81. It has a rod-shaped extending portion 82 that extends radially outward from 81 and has a flat surface 82a that is flush with the opening end surface 81b of the capturing portion 81. Further, the oil return member 80 is formed over the inner bottom surface of the capture portion 81, the inner peripheral surface (inner side surface) of the capture portion 81, and the flat surface 82a of the extending portion 82, and is formed on the peripheral edge of the insertion hole 81a of the capture portion 81. A groove 83 that continuously extends from the portion to the vicinity of the tip portion of the extending portion 82 is provided.

As shown in FIG. 2, the oil return member 80 is fitted with the outer peripheral surface of the boss portion 111a formed on the partition wall portion 111 with the inner peripheral surface of the catching portion 81, for example, with the extending portion 82 facing downward. Will be done. That is, the oil return member 80 is attached to the tip end portion of the boss portion 111a. At this time, the open end surface 81b of the capturing portion 81 and the flat surface 82a of the extending portion 82 are in close contact with the surface of the first closing plate 121 on the side of the first accommodating chamber 113, and the tip portion of the extending portion 82 is in close contact with the surface. It is located below the upper edge of the inlet side end 55a of the first suction passage 55 (see FIGS. 2 and 7).

As a result, mainly by the groove 83, between the end portion of the first shaft hole 111b on the first accommodating chamber 113 side, more specifically, the outer peripheral surface of the rotating shaft 200 and the inner peripheral surface of the first shaft hole 111b. A communication passage 90 is formed that communicates the end portion of the minute gap CL formed in the above on the first storage chamber 113 side and the inlet side end portion 55a of the first suction passage that opens into the first storage chamber 113. The tip of the extending portion 82 of the oil return member 80 is located on the upper edge side of the inlet side end portion 55a of the first suction passage 55, and the inlet side end portion 55a of the first suction passage 55 is sufficient. It has a large opening area (see FIGS. 2 and 7). That is, the inlet side end portion 55a of the first suction passage 55 does not have a decrease in compression performance due to a decrease in the amount of low-pressure refrigerant sucked by the compression mechanism portion 30 due to the extending portion 82 of the oil return member 80. Has a large opening area.

Next, the operation of the electric compressor 100 will be described with reference to FIGS. 10 and 11. FIG. 10 shows the flow of the refrigerant (gas) in the electric compressor 100, and FIG. 11 shows the flow of the lubricating oil O in the electric compressor 100.

The low-pressure side refrigerant (low-pressure refrigerant) of the external refrigerant circuit flows into the first storage chamber 113 that houses the electric motor unit 10 through the suction port 117 formed in the front housing 110b. That is, the first storage chamber 113 constitutes a "suction chamber" in which the low-pressure refrigerant flows in from the outside, and the pressure of the first storage chamber 113 is substantially the same as the pressure on the low-pressure side of the external refrigerant circuit.

When power is supplied to the electric motor unit 10, the rotating shaft 200 rotates, the first eccentric roller 33A rotates eccentrically in the first cylinder chamber 37A of the first compression mechanism unit 30A, and the second cylinder of the second compression mechanism unit 30B. In the chamber 37B, the second eccentric roller 33B rotates eccentrically.

As shown by the triangular arrows in FIG. 10, the low-pressure refrigerant that has flowed into the first storage chamber 113 from the suction port 117 passes through the gap between the stator 11 and the rotor 12 in the electric motor unit 10, whereby the electric motor unit 10 is moved. It is cooled. Then, the low-pressure refrigerant that has passed through the first suction passage 55 and the first suction port 41A (see FIG. 3) is sucked into the first cylinder chamber 37A from the first storage chamber 113, and the first suction passage 55 is sucked from the first storage chamber 113. , The low-pressure refrigerant that has passed through the second suction passage 56 and the second suction port 41B is sucked into the second cylinder chamber 37B. At this time, the lubricating oil O stored in the bottom of the first storage chamber 113 can also be sucked into the first cylinder chamber 37A and the second cylinder chamber 37B together with the low-pressure refrigerant (see FIG. 11).

The low-pressure refrigerant sucked into the first cylinder chamber 37A is compressed in the first cylinder chamber 37A by the eccentric rotation of the first eccentric roller 33A to become a high-pressure refrigerant. The high-pressure refrigerant is discharged from the first cylinder chamber 37A to the first discharge muffling chamber 45A through the first discharge port 43A (see FIG. 3) and the first communication hole 111d, as shown by the arrows opened in FIG. After that, it passes through the discharge communication passage 51 and flows into the second discharge muffling chamber 45B.

The low-pressure refrigerant that has flowed into the second cylinder chamber 37B is compressed in the second cylinder chamber 37B by the eccentric rotation of the second eccentric roller 33B to become a high-pressure refrigerant, and the high-pressure refrigerant is discharged from the second cylinder chamber 37B to the second discharge port 43B ( (See FIG. 4) and the second discharge muffling chamber 45B is discharged through the second communication hole 47c.

The high-pressure refrigerant discharged from the first cylinder chamber 37A and the high-pressure refrigerant discharged from the second cylinder chamber 37B merge in the second discharge muffling chamber 45B, and the merged high-pressure refrigerant passes through the discharge hole 53 to the second accommodation chamber 115. Is discharged to. That is, the second storage chamber 115 constitutes a "discharge chamber" in which the high-pressure refrigerant compressed by the compression mechanism unit 30 is discharged, and the pressure of the second storage chamber 115 is the pressure of the high-pressure refrigerant (the external refrigerant). It is almost the same as the pressure on the high voltage side of the circuit (higher than the pressure in the first accommodation chamber 113).

The high-pressure refrigerant discharged into the second storage chamber 115 contacts and / or collides with the inner surface of the housing 110 or the like, whereby the lubricating oil O contained therein is separated from the high-pressure refrigerant. The lubricating oil O separated from the high-pressure refrigerant moves downward mainly by gravity and is stored in the bottom of the second storage chamber 115. On the other hand, the high-pressure refrigerant after the lubricating oil O is separated flows out to the high-pressure side of the external refrigerant circuit through the discharge port 119 formed in the rear housing 110c.

As described above, in the present embodiment, the oil supply passage 70 has a first oil passage 71 formed inside the second closing plate 49 and a second oil passage 71 extending inside the rotating shaft 200 in the axial direction of the rotating shaft 200. It includes an oil passage 72 and first to fourth oil guide holes 73 to 76 extending radially inside the rotating shaft 200. Further, an oil return member 80 is attached to the tip of the boss portion 111a of the partition wall portion 111 so as to be adjacent to the end portion of the first shaft hole 111b on the first storage chamber 113 side.

One end (lower end) of the first oil passage 71 constituting one end of the oil supply passage 70 is a lubricating oil O stored in the second storage chamber 115, more specifically, in the bottom of the second storage chamber 115. Located inside. Further, the fourth oil guide hole 76 forming the other end of the oil supply passage 70 is more specifically formed on the outer peripheral surface of the rotating shaft 200 and the first shaft hole 111b via the first shaft hole 111b. It communicates with the first storage chamber 113 via a minute gap CL formed between the inner peripheral surface and the inner peripheral surface. The first storage chamber 113 constitutes a low-pressure chamber whose pressure is equivalent to that of the low-pressure refrigerant, and the second storage chamber 115 constitutes a high-pressure chamber whose pressure is equivalent to that of the high-pressure refrigerant.

Therefore, as shown by an arrow in FIG. 11, the second accommodating chamber is caused by the pressure difference between the second accommodating chamber (discharge chamber (high pressure chamber)) 115 and the first accommodating chamber (suction chamber (low pressure chamber)) 113. The lubricating oil O stored in the bottom of the 115 is sucked up through the first oil passage 71 and guided to the second oil passage 72. The lubricating oil O guided to the second oil passage 72 passes through the fourth oil guide hole 76 to the first shaft hole 111b (bearing portion of the rotating shaft 200 located between the electric motor portion 10 and the compression mechanism portion 30). Is supplied to. The lubricating oil O supplied to the first shaft hole 111b passes through the minute gap CL formed between the inner peripheral surface of the first shaft hole 111b and the outer peripheral surface of the rotating shaft 200 toward the first accommodating chamber 113. To do.

Most of the lubricating oil O that has passed through the minute gap CL formed between the inner peripheral surface of the first shaft hole 111b and the outer peripheral surface of the rotating shaft 200 is captured by the capturing portion 81 of the oil return member 80. Further, the gap between the outer peripheral surface of the rotating shaft 200 and the inner peripheral surface of the insertion hole 81a of the oil return member 80 is set so that the rotating shaft 200 can rotate and can be sealed by the lubricating oil O. Has been done. Further, the communication passage 90 formed by the groove 83 of the oil return member 80 has a minute gap CL formed between the inner peripheral surface of the first shaft hole 111b and the outer peripheral surface of the rotating shaft 200 and the first suction passage 55. It communicates with the entrance side end portion 55a of.

Therefore, most of the lubricating oil O that has passed through the minute gap CL formed between the inner peripheral surface of the first shaft hole 111b and the outer peripheral surface of the rotating shaft 200 passes through the communication passage 90 and is connected to the first suction passage 55. It is guided to the inlet side end portion 55a and is sucked into the first cylinder chamber 37A of the first compression mechanism portion 30A and the second cylinder chamber 37B of the second compression mechanism portion 30B together with the low pressure refrigerant in the first storage chamber 113. The lubricating oil O that has passed through the capture unit 81 will be discharged to the first storage chamber 113, but the lubricating oil O released into the first storage chamber 113 will subsequently fall and be discharged into the first storage chamber 113. It is stored in the bottom of 113 and can be sucked into the first cylinder chamber 37A of the first compression mechanism unit 30A and the second cylinder chamber 37B of the second compression mechanism unit 30B together with the low pressure refrigerant in the first storage chamber 113.

Further, the lubricating oil O guided to the second oil passage 72 is supplied to the second shaft hole 47a (bearing portion of the rotating shaft 200 on the rear end side) via the first oil guide hole 73.

Further, the lubricating oil O guided to the second oil passage 72 is guided to the inside of the second eccentric roller 33B through the second oil guide hole 74, and from there to each sliding portion of the second compression mechanism portion 30B. Supplied. Similarly, the lubricating oil O guided to the second oil passage 72 is guided to the inside of the first eccentric roller 33A through the third oil guide hole 75, and from there, each sliding portion of the first compression mechanism portion 30A. Is supplied to.

According to the electric compressor 100 according to the present embodiment, the following effects can be obtained.

In the electric compressor 100 according to the present embodiment, the inside of the housing 110 is divided into a first storage chamber 113 for accommodating the electric motor unit 10 and a second storage chamber 115 for accommodating the compression mechanism unit 30 by the partition wall portion 111. There is. Further, the bottom of the second accommodating chamber 115 constitutes a lubricating oil storage portion for accommodating the lubricating oil O, and the lubricating oil O is placed between the first accommodating chamber 113 and the second accommodating chamber 115 in the partition wall portion 111. There is no oil distribution port or the like for distribution in. Therefore, even when the electric compressor 100 is tilted or the like, the lubricating oil O hardly flows from the second storage chamber 115 into the first storage chamber 113, and a sufficient amount of the lubricating oil O is provided on the compression mechanism portion 30 side. Can be secured. Further, since there is almost no lubricating oil O that is agitated by the rotation of the electric motor unit 10, the amount of lubricating oil that flows out from the electric compressor 100 to the external refrigerant circuit together with the high-pressure refrigerant is also significantly reduced. Therefore, the lubricity and sealing property of the compression mechanism portion 30 can be ensured with a smaller amount of lubricating oil than in the past.

Further, the first accommodation chamber 113 is configured as a suction chamber (low pressure chamber) in which a low pressure refrigerant from the outside flows in through the suction port 117, and the second accommodation chamber 115 discharges the high pressure refrigerant compressed by the compression mechanism unit 30. It is configured as a discharge chamber (high pressure chamber). That is, the compression mechanism unit 30 is configured to suck in the low-pressure refrigerant in the first storage chamber 113, compress it, and discharge it to the second storage chamber 115. Further, the oil supply passage 70 sucks up the lubricating oil O stored in the second storage chamber 115 by utilizing the pressure difference between the second storage chamber 115 and the first storage chamber 113, and the first shaft hole 111b (electric motor portion). It is configured to supply to the bearing portion of the rotating shaft 200 located between the 10 and the compression mechanism portion 30). Therefore, during the operation of the electric compressor 100, lubrication to the first shaft hole 111b can be performed stably and reliably.

Further, the lubricating oil O that has passed through the first shaft hole 111b (specifically, the minute gap CL formed between the outer peripheral surface of the rotating shaft 200 and the inner peripheral surface of the first shaft hole 111b) is sucked first. An oil return member 80 that leads to the inlet side end portion 55a of the passage 55 is provided adjacent to the end portion of the first shaft hole 111b on the first accommodation chamber 113 side. Therefore, most of the lubricating oil O that has passed through the first shaft hole 111b is sucked into the compression mechanism section 30 together with the low-pressure refrigerant in the first storage chamber 113 before being discharged into the first storage chamber 113. Therefore, it is possible to reduce the amount of lubricating oil O that flows into and stays in the first storage chamber 113 through the first shaft hole 111b while sufficiently supplying oil to the first shaft hole 111b, and the compression mechanism unit 30 A sufficient amount of lubricating oil O can be secured on the side.

Further, in the electric compressor 100 according to the present embodiment, the suction passage (first suction) that guides the low-pressure refrigerant in the first storage chamber 113 to the compression mechanism section 30 (first compression mechanism section 30A, second compression mechanism section 30B). The passage 55 and the second suction passage 56) are arranged below the rotation shaft 200. In particular, in the present embodiment, the inlet-side end of the suction passage (the inlet-side end 55a of the first suction passage 55) that opens into the first storage chamber 113 is arranged near the lowermost portion of the first storage chamber 113. ing. Therefore, even when the lubricating oil O is stored in (the bottom portion of) the first storage chamber 113, the lubricating oil O can be quickly sucked into the compression mechanism unit 30. Therefore, the amount of the lubricating oil O staying in the first storage chamber 113 is reduced, and a sufficient amount of the lubricating oil O can be secured on the compression mechanism portion 30 side.

Further, the suction port 117 is provided on the side opposite to the partition wall portion 111 with the electric motor portion 10 interposed therebetween and at a height position corresponding to the rotation shaft 200. Therefore, the low-pressure refrigerant flowing from the suction port 117 into the first storage chamber 113 can be used in a well-balanced manner for cooling the electric motor unit 10 and suppressing the retention of the lubricating oil O in the first storage chamber 113.

Although not shown, the outer peripheral surface of the rotating shaft 200 and the outer peripheral surface of the rotating shaft 200 are located on the inner peripheral surface of the first shaft hole 111b or on the outer peripheral surface of the rotating shaft 200 located in the first shaft hole 111b. A spiral groove may be formed to move the lubricating oil O located between the inner peripheral surface and the lubricating oil O from the first storage chamber 113 side to the second storage chamber 115 side. By doing so, the time for the lubricating oil O to stay between the outer peripheral surface of the rotating shaft 200 and the inner peripheral surface of the first shaft hole 111b becomes longer, and the lack of lubricating oil in the first shaft hole 111b is effective. Can be prevented.

Further, in the above-described embodiment, the partition wall portion 111 is integrally provided with the housing 110 (center housing 110a). However, it is not limited to this. The partition wall portion 111 may be formed separately from the housing 110 and may be configured to be detachably attached to the housing 110, for example.

Further, the oil return member 80 first passes the lubricating oil O that has passed through the first shaft hole 111b (the minute gap CL formed between the outer peripheral surface of the rotating shaft 200 and the inner peripheral surface of the first shaft hole 111b). It suffices if it can be guided to the inlet side end portion 55a of the suction passage 55, and is not limited to the shape of the above-described embodiment.

Although the embodiments of the present invention and modified examples thereof have been described above, the present invention is not limited to the above-described embodiments and modified examples thereof, and further modifications and modifications are made based on the technical idea of the present invention. Of course it is possible.

10 ... Electric unit, 11 ... Stator, 12 ... Rotor, 30 ... Compression mechanism, 30A ... First compression mechanism, 30B ... Second compression mechanism, 55 ... First suction passage, 55a ... Open end (entrance side) (End), 56 ... 2nd suction passage, 51 ... Discharge communication passage, 53 ... Discharge hole, 70 ... Oil supply passage, 71 ... 1st oil passage, 72 ... Second oil passage (passage in rotating shaft), 73 ... 1st oil guide hole, 74 ... 2nd oil guide hole, 75 ... 3rd oil guide hole, 76 ... 4th oil guide hole (communication hole), 80 ... oil return member, 81 ... capture part, 82 ... extension part , 83 ... groove, 90 ... continuous passage, 100 ... horizontal electric compressor, 110 ... housing, 110a ... center housing, 110b ... front housing, 110c ... rear housing, 111 ... partition wall part, 111a ... boss part, 111b ... th 1 shaft hole (bearing part), 113 ... 1st accommodation chamber, 115 ... 2nd accommodation chamber 117 ... suction port, 119 ... discharge port, 200 ... rotating shaft, CL ... minute gap, O ... lubricating oil

Claims (7)

The motor portion that rotates the rotating shaft and the compression mechanism portion that is driven via the rotating shaft are provided in the housing, and the bearing portion of the rotating shaft that rotatably supports the rotating shaft is the electric motor portion and the compression. It is a horizontal electric compressor installed between the mechanism and the mechanism.
A partition wall portion for partitioning the inside of the housing into a first accommodating chamber for accommodating the electric motor portion and a second accommodating chamber for accommodating the compression mechanism portion and having a pressure higher than the pressure of the first accommodating chamber.
An oil supply passage for supplying lubricating oil to the bearing portion, one end of which is located in the second accommodating chamber and the other end side communicating with the first accommodating chamber via the bearing portion. The oil supply passage configured to supply the lubricating oil to the bearing portion by utilizing the pressure difference between the second accommodating chamber and the first accommodating chamber.
Have,
The compression mechanism unit is configured to suck the low-pressure refrigerant in the first storage chamber through the suction passage, compress it, and discharge it to the second storage chamber.
An oil return member that guides the lubricating oil that has passed through the bearing portion to the inlet-side end of the suction passage that opens into the first accommodation chamber is provided adjacent to the end of the bearing portion on the first accommodation chamber side. Has been
Horizontal electric compressor. The horizontal electric compressor according to claim 1, wherein the oil return member has a communication passage that communicates an end portion of the bearing portion on the first accommodating chamber side and an end portion on the inlet side of the suction passage. The oil return member has a catching portion for catching the lubricating oil that has passed through the bearing portion, and is configured to guide the lubricating oil trapped by the catching portion to the inlet side end portion of the suction passage. ,
The horizontal electric compressor according to claim 1 or 2. The horizontal electric compressor according to any one of claims 1 to 3, wherein the inlet side end of the suction passage is arranged near the lowermost portion of the first storage chamber. The bearing portion is a shaft hole through which the rotating shaft is inserted.
The other end side of the oil supply passage communicates with the first storage chamber through a minute gap formed between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the shaft hole.
The oil supply passage is configured to supply the lubricating oil to the minute gaps.
The oil return member is configured to guide the lubricating oil that has passed through the minute gap to the inlet side end of the suction passage.
The horizontal electric compressor according to any one of claims 1 to 4. 5. The oil supply passage includes a passage in a rotation shaft extending inside the rotation shaft along the axis of the rotation shaft, and a communication hole for communicating the passage in the rotation shaft and the minute gap. Horizontal electric compressor described in. The partition wall portion has a boss portion projecting toward the first storage chamber side, and has a boss portion.
The shaft hole is formed as a through hole penetrating from the tip surface of the boss portion to the surface of the partition wall portion on the second accommodating chamber side.
The oil return member is attached to the tip of the boss portion.
The horizontal electric compressor according to claim 5 or 6.

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