WO2023090110A1

WO2023090110A1 - Compressor

Info

Publication number: WO2023090110A1
Application number: PCT/JP2022/040112
Authority: WO
Inventors: 政和石飛; 善彰宮本; 隆史渡辺; 秀作後藤
Original assignee: 三菱重工サーマルシステムズ株式会社
Priority date: 2021-11-22
Filing date: 2022-10-27
Publication date: 2023-05-25
Also published as: JP2023076190A

Abstract

This compressor comprises: an oil level tank (60) that is provided adjacent to a housing (11) and measures the height of the surface of an oil in an oil reservoir; a pressure-equalizing pipe (62) that is connected at one end to an adjacent side surface (11a) of the housing (11) and connects the housing (11) and the oil level tank (60); and a lower pipe (61) that is connected at one end to the adjacent side surface (11a) and connects the housing (11) and the oil level tank (60). The pressure-equalizing pipe (62) has a housing-side pipe (81) that is connected to the housing (11), an oil level tank–side pipe (82) that is connected to the oil level tank (60), and a U-shaped U-pipe (83) that connects the housing-side pipe (81) and the oil level tank–side pipe (82). The U-pipe (83) is inserted into the housing-side pipe (81) and the oil level tank–side pipe (82) from above.

Description

compressor

This disclosure relates to a compressor.

A hermetic compressor having a compression mechanism in a housing is known. As a hermetic compressor, in addition to a compressor main body whose outer shell is a housing, other devices are provided adjacent to the compressor main body, and the compressor main body and other devices are connected by piping. A thing is known (for example, patent document 1).
Patent Document 1 discloses a compression device comprising a sealed container that houses a compression mechanism, a discharge muffler that is provided adjacent to the sealed container, and a discharge pressure connection pipe and an oil return pipe that connect the sealed container and the discharge muffler. machine is described.

JP 2008-175066 A

The pipes used in compressors (especially those that use carbon dioxide as a refrigerant) are designed to be thick enough to withstand high pressures, making them difficult to deform. For this reason, when a pipe is provided to connect the housing of the compressor and another device adjacent to the housing (hereinafter referred to as "adjacent device"), this pipe does not easily absorb the tolerance of each part. Therefore, in such a compressor, it is possible that the tolerance of each part cannot be sufficiently absorbed, and the pipes cannot be connected to the appropriate positions of the housing and adjacent devices. In particular, when there are two or more pipes connecting the housing and adjacent devices, if one of the pipes is installed, there is a possibility that the other pipes cannot be installed at appropriate positions due to the tolerances of each part. .

In the compressor described in Patent Document 1, the discharge pressure connecting pipe is disposed on the outer peripheral surface of the closed container opposite to the surface adjacent to the discharge muffler (adjacent device) (hereinafter referred to as "non-adjacent side surface"). ) are connected. In such a case, it is necessary to extend the discharge pressure connection pipe to the non-adjacent side, so the length of the discharge pressure connection pipe is increased. For this reason, compared with the case where the discharge pressure connection pipe is short, the tolerance of each component can be easily absorbed by the discharge pressure connection pipe as a whole. Therefore, it was relatively easy to connect the discharge pressure connection pipe to the appropriate positions of the closed container and the discharge muffler.

On the other hand, for various reasons, there are cases where the pipe connecting the housing and the adjacent device is connected to the side of the outer peripheral surface of the housing that is adjacent to the adjacent device (hereinafter referred to as the "adjacent side surface"). In such a case, the length of the piping is shortened compared to connecting to non-adjacent sides. For this reason, it is difficult to absorb the tolerance of each part by the entire piping, so there is a problem that it is difficult to connect the piping to the appropriate positions of the housing and adjacent devices.

The present disclosure has been made in view of such circumstances, and provides a compressor in which a pipe connecting the housing and the oil level tank can be appropriately connected to the housing and the oil level tank. The purpose is to

In order to solve the above problems, the compressor of the present disclosure employs the following means.
A compressor according to an aspect of the present disclosure includes a rotating shaft portion that is rotationally driven, a compression mechanism that is connected to one end of the rotating shaft portion and compresses a refrigerant, and houses the rotating shaft portion and the compression mechanism. a housing having an oil pool below; an oil level tank provided adjacent to the housing for measuring the height of the oil level in the oil pool; and an adjacent surface of the housing adjacent to the oil level tank a first connection pipe having one end connected to a side surface and connecting the housing and the oil level tank; and a second connection pipe having one end connected to the adjacent side surface and connecting the housing and the oil level tank; wherein the first connection pipe connects a housing side pipe connected to the housing, an oil level tank side pipe connected to the oil level tank, and the housing side pipe and the oil level tank side pipe. and a U-shaped U-shaped pipe that connects the U-shaped pipe and the housing-side pipe so that one of the U-shaped pipe and the housing-side pipe is inserted from above or below the other, and the U-shaped pipe and the oil level tank side pipe are connected such that one is inserted into the other from above or below.

According to the present disclosure, the pipe connecting the housing and the oil level tank can be properly connected to the housing and the oil level tank.

1 is a vertical cross-sectional view showing a compressor according to an embodiment of the present disclosure; FIG. FIG. 2 is a vertical cross-sectional view showing a main part of the compressor of FIG. 1; FIG. 3 is an end view at section line III-III of FIG. 2; FIG. 2 is a front view showing a main part (an oil level tank) of the compressor of FIG. 1; FIG. 2 is a plan view showing a main part (an oil level tank) of the compressor of FIG. 1; FIG. 2 is a bottom view showing a main part (oil level tank) of the compressor of FIG. 1;

Embodiments according to the present disclosure will be described below with reference to the drawings.
As shown in FIG. 1, a compressor 1 is used in an air conditioner, and performs two-stage compression of a refrigerant R, which is gas such as carbon dioxide. Compressor 1 is fixed to installation surface FL via legs 3 . The compressor 1 includes a housing 11 , a rotary compression mechanism 12 provided inside the housing 11 , a scroll compression mechanism 13 , an electric motor 14 , and a rotating shaft (rotating shaft portion) 15 .

The housing 11 includes a cylindrical body portion 21 and upper and

lower lid portions

22 and 23 that close the upper and lower openings of the body portion 21 . The inside of the housing 11 forms a closed space.

The rotating shaft 15 is provided to extend vertically along the axis X inside the housing 11 . An upper end side of the rotating shaft 15 is rotatably supported by an upper bearing 31 . A lower end side of the rotating shaft 15 is rotatably supported by a lower bearing 32 .

The electric motor 14 is arranged in the center in the longitudinal direction of the rotating shaft 15 and on the outer peripheral side of the rotating shaft 15, and rotates the rotating shaft 15 around the axis X. The electric motor 14 has a rotor 38 fixed to the outer peripheral surface of the rotary shaft 15 , and is radially opposed to the rotor 38 with a gap therebetween, and is shrink-fitted to the inner wall of the main body portion 21 of the housing 11 . and a stator 39 fixed by

The rotor 38 is provided with rotor passages 38a provided at predetermined intervals in the circumferential direction. Each rotor passage 38a penetrates the rotor 38 in the vertical direction (axis X direction). The refrigerant discharged from the rotary compression mechanism 12 flows upward through these rotor passages 38a. An oil separation plate 38 b is fixed to the upper portion of the rotor 38 . The oil separation plate 38b is disc-shaped and arranged to extend in the horizontal direction. The oil separation plate 38b rotates around the axis X together with the rotor 38. As shown in FIG.

A plurality of stator passages 39a are formed on the outer periphery of the stator 39 at predetermined angular intervals in the circumferential direction (specifically described later with reference to FIG. 3).
As shown in FIG. 1, an upper coil end 39b with a folded winding is positioned above the stator 39, and a lower coil end 39c with a folded winding is positioned below the stator 39. As shown in FIG. The electric motor 14 is connected to a power source via an inverter (not shown), and rotates the rotary shaft 15 with a variable frequency.

The rotary compression mechanism 12 is provided inside the housing 11 on the lower end (other end) side of the rotating shaft 15 . The rotary compression mechanism 12 has two cylinders in this embodiment. It has a rotor 42 that is eccentric and rotates in the compression chamber C1, and a cylinder 44 in which the compression chamber C1 is formed.

Refrigerant R is supplied from the suction pipe 33 to the compression chamber C1 formed in the cylinder 44 . The refrigerant compressed in the compression chamber C1 passes through the lower bearing 32 (specifically, the discharge space formed inside the lower bearing 32) and flows from the guide pipe 43 into the area below the electric motor 14 in the housing 11. Dispensed.

The cylinder 44 is fixed from below with bolts 48 to the lower bearing 32 . An oil pump 49 fixed together with the cylinder 44 by bolts 48 is provided below the cylinder 44 . The oil pump 49 sucks the oil from the oil reservoir O1 at the bottom of the housing 11, passes through the oil supply hole 15a extending along the axis X of the rotating shaft 15, and guides it to the upper bearing 31 side.

The scroll compression mechanism 13 is arranged above the electric motor 14 inside the housing 11 . The scroll compression mechanism 13 includes a fixed scroll 51 fixed to the upper bearing 31 and an orbiting scroll 57 arranged below the fixed scroll 51 so as to face the fixed scroll 51 .

The fixed scroll 51 has an end plate 52 fixed to the upper surface of the upper bearing 31 and a fixed wrap 53 projecting downward from the end plate 52 . A discharge hole 52a penetrating vertically is formed in the central portion (near the axis X) of the end plate 52 .

The orbiting scroll 57 is arranged so as to be sandwiched between the upper bearing 31 and the fixed scroll 51 . The orbiting scroll 57 has an end plate 58 connected to the upper end side of the rotating shaft 15 and an orbiting wrap 59 projecting upward from the end plate 58 .

The end plate 58 is fixed via a bush 55 to an eccentric shaft portion 56 provided at the upper end of the rotating shaft 15 and rotates eccentrically with respect to the axis X as the rotating shaft 15 rotates.

The orbiting wrap 59 meshes with the fixed wrap 53 to form a compression chamber C2 for compressing the refrigerant R between itself and the fixed wrap 53 .

A balance weight chamber 63 is formed between the recess on the central side of the upper bearing 31 and the bottom of the orbiting scroll 57 . Inside the balance weight chamber 63 , the balance weight 54 rotates together with the rotating shaft 15 .

The refrigerant R compressed by the rotary compression mechanism 12 and discharged into the housing 11 is sucked into the compression chamber C2 from the outer peripheral side of the scroll compression mechanism 13 and compressed toward the center. The compressed refrigerant R is discharged from the discharge pipe 34 to the outside of the housing 11 through the discharge hole 52 a of the fixed scroll 51 .

A cover 45 is provided below the upper bearing 31 so as to cover the upper bearing 31 . The cover 45 is formed by sheet metal processing, and has a substantially conical shape that expands in diameter from bottom to top. An outer peripheral upper end of the cover 45 is fixed to the upper bearing 31 by a bolt 45b (see FIG. 2).

A suction opening 45 a is provided at the lower end of the cover 45 . That is, the intake opening 45 a is an annular region that faces downward and is formed between the cover 45 and the rotating shaft 15 . A space below the housing 11 and a space on the side of the upper bearing 31 are partitioned by the cover 45 so that only the refrigerant sucked from the suction opening 45 a is guided to the scroll compression mechanism 13 .

An oil level tank 60 is provided outside and below the housing 11 . The oil level tank 60 is a hollow container and communicates with the inside of the housing 11 via a lower pipe 61 and an upper pressure equalizing pipe (first connecting pipe) 62 . The oil level tank 60 measures the oil level of the oil reservoir O1 by introducing oil from the oil reservoir O1 in the housing 11 through a lower pipe (second connection pipe) 61 .

A downstream end of an oil separator oil return pipe 65 is connected to the lower side portion of the housing 11 . An upstream end of the oil separator oil return pipe 65 is connected to an oil separator (not shown). The oil separated from the refrigerant discharged from the compressor 1 by the oil separator is returned to the oil reservoir O<b>1 inside the housing 11 via the oil separator oil return pipe 65 . The height position where the downstream end of the oil separator oil return pipe 65 is connected to the housing 11 is below the lower bearing 32 .

An oil return pipe 67 is provided in the housing 11 and extends vertically while contacting the inner wall of the housing 11 . As shown in FIG. 2, the oil return pipe 67 is provided so that its upper end (one end) is fixed to the upper bearing 31 via a boss 68 and its lower end (the other end) is positioned in the oil reservoir O1 at the bottom of the housing 11. It is A lower end of the oil return pipe 67 is fixed to the inner wall of the housing 11 via a rod-like member 70 .

The oil return pipe 67 is provided so as to pass through the space formed between the stator 39 and the housing 11 . Specifically, as shown in FIG. 3, notches are provided in the outer circumference of the stator 39 at predetermined angular intervals in the circumferential direction, thereby forming a plurality of stator passages 39a in the circumferential direction between the stator 39 and the inner wall of the housing 11. ing. Refrigerant and oil flow through these stator passages 39a. Two oil return pipes 67 are inserted through one or more of these stator passages 39a.

As can be seen from FIG. 3, the rotor passages 38a are provided at predetermined intervals in the circumferential direction. The refrigerant discharged from the rotary compression mechanism 12 flows upward through these rotor passages 38a.
Further, as shown in FIG. 2, a stabilizing plate 75 is fixed to the lower surface of the lower bearing 32 (see FIG. 1). The stabilizing plate 75 is fixed to the lower bearing 32 (specifically, the radially protruding leg of the lower bearing 32) with bolts. The stabilizing plate 75 is a disc with an opening in the center. The stabilizing plate 75 stabilizes the oil surface by covering above the oil surface of the oil reservoir O1.

Next, the oil level tank 60, the pressure equalizing pipe 62 connecting the housing 11 and the oil level tank 60, and the lower pipe 61 will be described with reference to FIGS. 4 to 6. FIG.
The oil level tank 60 is arranged adjacent to the housing 11 as shown in FIG. The oil level tank 60 includes a cylindrical body portion 60a, and an upper lid portion 60b and a lower lid portion 60c that close upper and lower openings of the body portion 60a. The inside of the oil level tank 60 forms a closed space. The oil level tank 60 measures the height of the oil level of the oil pool O1 by, for example, a capacitance sensor (not shown) provided inside. It should be noted that the method by which the oil level tank 60 measures the height of the oil level is not limited to this. Other methods may be used to measure the oil level.

The oil level tank 60 is fixed to the housing 11 with a bracket 90. The bracket 90 fixes the body portion 60 a of the oil level tank 60 to the body portion 21 of the housing 11 .

The lower pipe 61 connects the lower lid portion 23 of the housing 11 and the lower lid portion 60c of the oil level tank 60, as shown in FIG. 6, one end of the lower pipe 61 is connected to the adjacent side surface 11a of the housing 11 adjacent to the oil level tank 60, and the other end is connected to the outer peripheral surface of the oil level tank 60. It is The other end of the lower pipe 61 may be connected to an adjacent side surface of the outer peripheral surface of the oil level tank 60 adjacent to the housing 11 . The lower pipe 61 is made of, for example, a metal material (eg, copper). Note that the material of the lower pipe 61 is not limited to this.

The lower pipe 61 also has a housing-side lower pipe 86 connected to the housing 11 and an oil-level tank-side lower pipe 87 connected to the oil level tank 60 . The housing-side lower pipe 86 extends linearly. Further, the housing-side lower pipe 86 is provided with a lower expanded pipe portion 86a having a larger inner diameter than the other portion at the tip (the end on the oil level tank-side lower pipe 87 side). An oil level tank side lower pipe 87 is inserted into the lower expanded pipe portion 86a. The oil level tank side lower pipe 87 is curved when viewed from above. The bending angle (smaller angle) of the oil level tank side lower pipe 87 is set to the same angle as the bending angle θ1 of the pressure equalizing pipe 62, which will be described later. The outer diameter of the tip of the oil level tank side lower pipe 87 (the end on the housing side lower pipe 86 side) is smaller than the inner diameter of the lower expanded pipe portion 86a, and is inserted into the lower expanded pipe portion 86a. The housing-side lower pipe 86 and the oil level tank-side lower pipe 87 are fixed by brazing the portions inserted into the lower expanded pipe portion 86a.

As shown in FIGS. 4 and 5, the pressure equalizing pipe 62 communicates the inside of the housing 11 with the inside of the oil level tank 60 to equalize the pressure inside the housing 11 and the pressure inside the oil level tank 60. It is homogenized. The pressure equalizing pipe 62 connects the body portion 21 of the housing 11 and the upper lid portion 60b of the oil level tank 60, as shown in FIG. As shown in FIG. 1, the pressure equalizing pipe 62 is connected below the center of the housing 11 in the longitudinal direction (axis X direction) and above the oil reservoir O1. Specifically, the equalizing tube 62 is connected between the electric motor 14 and the lower bearing 32 . 5, one end of the pressure equalizing pipe 62 is connected to the adjacent side surface 11a of the housing 11 adjacent to the oil level tank 60, and the other end is connected to the outer peripheral surface of the oil level tank 60. It is The other end of the pressure equalizing pipe 62 may be connected to an adjacent side surface of the outer peripheral surface of the oil level tank 60 adjacent to the housing 11 . The pressure equalizing tube 62 is made of, for example, a metal material (eg, copper). Note that the material of the pressure equalizing tube 62 is not limited to this.

The adjacent side surface 11a of the housing 11 is defined by the center line L, which is the line connecting the center point of the housing 11 (the point through which the axis X passes) and the center point of the oil level tank 60 in the cross section of the compressor 1. On the other hand, it is the outer peripheral surface of the housing 11 positioned within a range forming an angle of 90 degrees. That is, the adjacent side surface 11a is the outer peripheral surface of the housing 11 located within a range of 180 degrees in the circumferential direction around the intersection point P between the center line L and the housing 11 . Further, the adjacent side surface of the oil level tank 60 is the outer peripheral surface of the oil level tank 60 located within a range forming an angle of 90 degrees with respect to the center line L.
The housing-side pipe 81 may be connected to any one of the adjacent side surfaces 11a. are doing.

4 and 5, the pressure equalizing pipe 62 includes a housing side pipe 81 connected to the housing 11, an oil level tank side pipe 82 connected to the oil level tank 60, and a housing side pipe 81. and a U-shaped U-shaped pipe 83 that connects with the oil level tank side pipe 82 .

As shown in FIGS. 4 and 5, the housing-side pipe 81 includes a housing-side horizontal pipe 81a extending substantially horizontally from the housing 11, and a housing-side vertical pipe 81a extending upward by bending at a substantially right angle from the tip of the housing-side horizontal pipe 81a. and a pipe 81b are integrally provided. At the tip of the housing-side pipe 81 (the tip of the housing-side vertical pipe 81b), a housing-side expanded tube portion 81c having a larger inner diameter than the other portions is provided. The inner diameter of the housing-side expanded pipe portion 81c is larger than the outer diameter of the U-shaped pipe 83, which will be described later. The housing-side expanded tube portion 81c opens upward.

As shown in FIGS. 4 and 5, the oil level tank side pipe 82 is composed of an oil level tank side horizontal pipe 82a extending substantially horizontally from the oil level tank 60 and an oil level tank side horizontal pipe 82a bent at a substantially right angle from the tip of the oil level tank side horizontal pipe 82a. and an oil level tank side vertical pipe 82b extending upward. At the tip of the oil level tank side pipe 82 (the tip of the oil level tank side vertical pipe 82b), an oil level tank side expanded pipe portion 82c having a larger inner diameter than the other portions is provided. The inner diameter of the oil level tank side expanded pipe portion 82c is larger than the outer diameter of the U-shaped pipe 83, which will be described later. The oil level tank side expanded tube portion 82c is open upward.

As shown in FIG. 5, the housing-side horizontal pipe 81a and the oil-level-tank-side horizontal pipe 82a are arranged such that the extended lines of their central axes form an angle θ1 when viewed from above. In this embodiment, the angle θ1 is an acute angle. More specifically, in this embodiment, the angle θ1 is approximately 50 degrees. Note that the numerical value of the angle θ1 is an example and is not limited to this numerical value. Further, as shown in FIG. 4, the housing-side vertical pipe 81b and the oil-level-tank-side vertical pipe 82b are arranged substantially parallel to each other.

As shown in FIG. 4, the U-shaped pipe 83 is curved so as to be folded back 180 degrees when viewed from the front. That is, the U-shaped pipe 83 circulates the fluid flowing inside upward, then turns it back 180 degrees and circulates downward. One end of the U-shaped pipe 83 is inserted from above into the housing-side expanded tube portion 81c of the housing-side pipe 81 from above. The other end of the U-shaped pipe 83 is inserted from above into the oil level tank side expanded pipe portion 82c of the oil level tank side pipe 82 from above. The outer diameter of the U-shaped pipe 83 is formed to be smaller than the inner diameters of the housing side expanded tube portion 81c and the oil level tank side expanded tube portion 82c.

The U-shaped pipe 83 and the housing-side pipe 81 are fixed by brazing the portion inserted into the housing-side expanded pipe portion 81c. The U-shaped pipe 83 and the oil level tank side pipe 82 are fixed by brazing the portion inserted into the oil level tank side expanded pipe portion 82c.

The compressor 1 configured as described above operates as follows.
Refrigerant evaporated by an evaporator (not shown) is sucked into the compressor 1 through a suction pipe 33 and compressed by the rotary compression mechanism 12 . The refrigerant compressed by the rotary compression mechanism 12 is discharged inside the housing 11 through the guide pipe 43 .
Refrigerant discharged into the housing 11 is sucked from the suction opening 45a of the cover 45, passes through the flow path in the cover 45, is guided to the scroll compression mechanism 13, and is compressed. The refrigerant compressed by the scroll compression mechanism 13 passes through the discharge hole 52a of the fixed scroll 51 and is discharged from the discharge pipe 34 to an external gas cooler or condenser.

Oil is separated from the refrigerant discharged from the discharge pipe 34 by an oil separator (not shown). The separated oil passes through the oil separator oil return pipe 65, is returned into the housing 11, and is stored in the oil reservoir O1.

The oil stored in the oil reservoir O1 is sucked up by the oil pump 49 and guided to the scroll compression mechanism 13 side through the oil supply hole 15a formed in the rotary shaft 15. The oil guided to the scroll compression mechanism 13 side lubricates sliding portions such as the bearing portion of the upper bearing 31 and the bush 55, and then is returned to the oil reservoir O1 below. Of the lubricated oil, the oil guided to the balance weight chamber 63 is guided to the oil return pipe 67 through the oil return hole 31 a and the vertical hole 31 b (see FIG. 2) formed in the upper bearing 31 .

The oil guided to the oil return pipe 67 passes through the internal flow path, is discharged from the lower end, and is returned to the oil reservoir O1.

According to the present disclosure, the following effects are achieved.
In this embodiment, both the equalizing pipe 62 and the lower pipe 61 are connected to the adjacent side surface 11 a of the housing 11 . Therefore, compared to the case where the equalizing pipe 62 and the lower pipe 61 are connected to the surface opposite to the adjacent side surface 11a of the housing 11, the lengths of the equalizing pipe 62 and the lower pipe 61 are shortened. Therefore, the size of the compressor 1 can be reduced.

In this embodiment, the U-shaped pipe 83 and the housing-side pipe 81 are connected so that one is inserted into the other from above or below, and both the U-shaped pipe 83 and the oil level tank-side pipe 82 One is connected to the other so that it can be inserted from above or below. Specifically, a U-shaped pipe 83 is inserted into the housing-side pipe 81 and the oil level tank-side pipe 82 from above. As a result, by adjusting the length of insertion of the U-shaped pipe 83, it is possible to absorb vertical tolerances (deviations from design) of each part.
In addition, at the insertion portion of the housing side pipe 81, the oil level tank side pipe 82, and the U-shaped pipe 83, the outer peripheral surface of one pipe (the pipe on the insertion side, which is the U-shaped pipe 83 in this embodiment) and the other (the pipes to be inserted, which are the housing-side pipe 81 and the oil level tank-side pipe 82 in this embodiment). This gap allows the horizontal tolerance of each component to be absorbed. In addition, since there are two insertion portions (the connection portion between the housing side pipe 81 and the U-shaped pipe 83 and the connection portion between the oil level tank side pipe 82 and the U-shaped pipe 83), there is only one insertion portion. More horizontal tolerances can be accommodated compared to .
In this way, the pressure equalizing pipe 62 can absorb vertical tolerances and horizontal tolerances, so that both the pressure equalizing pipe 62 and the lower pipe 61 are properly connected to the housing 11 and the oil level tank 60. be able to.

Also, in this embodiment, a U-shaped pipe 83 is inserted from above into the housing side pipe 81 and the oil level tank side pipe 82 . As a result, the process (for example, brazing) for connecting the housing side pipe 81 and the oil level tank side pipe 82 to the U-shaped pipe 83 can be facilitated.

Further, in this embodiment, a housing-side expanded tube portion 81 c is provided at the end of the housing-side pipe 81 . An oil level tank side expanded tube portion 82c is provided at the end of the oil level tank side pipe 82 . This makes it easier to insert the U-shaped pipe 83 into the housing-side pipe 81 and the oil level tank-side pipe 82 .
In addition, since the gap between the inner peripheral surface of the housing-side pipe 81 and the outer peripheral surface of the U-shaped pipe 83 is increased, it is possible to absorb more tolerance in the horizontal direction.

Also, in this embodiment, the U-shaped pipe 83 is arranged so as to be curved when viewed from the front. That is, the pressure equalizing tube 62 is curved when viewed from the front. Further, the pressure equalizing pipe 62 is also curved when viewed from above. Thus, the pressure equalizing pipe 62 is curved in a plurality of directions (vertical direction and horizontal direction). That is, the pressure equalizing tube 62 is three-dimensionally curved. As a result, even if the housing 11 vibrates in various directions due to compression of the refrigerant, the pressure equalizing tube 62 can absorb the vibrations. Therefore, damage to the equalizing tube 62 and the like due to vibration can be suppressed.

In this embodiment, the housing side pipe 81, the oil level tank side pipe 82, and the U-shaped pipe 83 have one curved portion. As a result, for example, each pipe can be manufactured by bending the straight pipe only once. Therefore, each pipe can be manufactured easily.
In addition, since each pipe has a relatively simple shape, the assembling work can be facilitated.

It should be noted that the present disclosure is not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the present disclosure.
For example, in the above embodiment, an example in which the U-shaped pipe 83 is inserted into the housing-side pipe 81 and the oil level tank-side pipe 82 from above has been described, but the present disclosure is not limited to this. For example, the housing-side pipe 81 and the oil-level-tank-side pipe 82 are not provided with pipe-expansion portions, but the U-shaped pipe 83 is provided with pipe-expansion portions at both ends, and the U-shaped pipe 83 is provided with the housing-side pipe 81 and the oil-level-tank-side pipe. The pipe 82 may be inserted from below.

For example, the compressor described in the embodiment described above is understood as follows.
A compressor according to an aspect of the present disclosure includes a rotating shaft portion (15) that is rotationally driven, compression mechanisms (12, 13) that are connected to one end of the rotating shaft portion and compresses a refrigerant, and the rotating shaft portion. and a housing (11) that houses the compression mechanism and has an oil pool (O1) below; and an oil level tank (60) that is provided adjacent to the housing and measures the oil level of the oil pool. , a first connection pipe (62) having one end connected to an adjacent side surface (11a) of the housing adjacent to the oil level tank and connecting the housing and the oil level tank; a second connection pipe (61) having one end connected to and connecting the housing and the oil level tank, the first connection pipe being a housing side pipe (81) connected to the housing; An oil level tank side pipe (82) connected to the oil level tank, and a U-shaped U-shaped pipe (83) connecting the housing side pipe and the oil level tank side pipe, The U-shaped pipe and the housing-side pipe are connected so that one is inserted into the other from above or below, and one of the U-shaped pipe and the oil level tank-side pipe is connected to the other. are connected so that they can be inserted from above or below.

In the above configuration, both the first connecting pipe and the second connecting pipe are connected to adjacent side surfaces of the housing. Therefore, the lengths of the first connecting pipe and the second connecting pipe are shortened compared to the case where the first connecting pipe and the second connecting pipe are connected to the side opposite to the adjacent side of the housing. Therefore, the size of the compressor can be reduced.
In the above configuration, the U-shaped pipe and the housing-side pipe are connected so that one is inserted into the other from above or below, and one of the U-shaped pipe and the oil level tank-side pipe is connected to the other. are connected so that they can be inserted from above or below. As a result, by adjusting the length of the portion into which the pipe is inserted, it is possible to absorb the vertical tolerance of each part.
In addition, in the insertion part of the housing side pipe, the oil level tank side pipe, and the U-shaped pipe, the outer peripheral surface of one pipe (inserted pipe) and the inner peripheral surface of the other pipe (inserted pipe) There is a gap between This gap allows the horizontal tolerance of each component to be absorbed. In addition, there are two insertion points (the connection between the housing-side pipe and the U-shaped pipe and the connection between the oil level tank-side pipe and the U-shaped pipe), so compared to the case where there is only one insertion point. to accommodate more horizontal tolerances.
In this way, since the first connecting pipe can absorb the vertical tolerance and the horizontal tolerance, both the first connecting pipe and the second connecting pipe are properly connected to the housing and the oil level tank. can do.

Further, in the compressor according to one aspect of the present disclosure, one end of the U-shaped pipe is inserted into the housing-side pipe from above, and the other end is inserted into the oil level tank-side pipe from above.

In the above configuration, a U-shaped pipe is inserted from above into the housing side pipe and the oil level tank side pipe. This makes it easier to perform processing (for example, brazing) for connecting the housing-side pipe and the oil level tank-side pipe to the U-shaped pipe.

Further, in the compressor according to one aspect of the present disclosure, an expanded pipe portion (81c) having a larger inner diameter than other portions is provided at the end of the housing-side pipe on the side where the U-shaped pipe is inserted. there is

In the above configuration, the expanded pipe portion is provided at the end of the housing-side pipe. This makes it easier to insert the U-shaped pipe into the housing-side pipe.
In addition, since the gap between the inner peripheral surface of the housing-side pipe and the outer peripheral surface of the U-shaped pipe is increased, it is possible to absorb more tolerance in the horizontal direction.

Further, in the compressor according to one aspect of the present disclosure, the U-shaped pipe is arranged so as to be curved in a front view, and the first connection pipe is arranged to be the housing-side pipe and the oil level pipe in a top view. It is curved so that the angle formed with the tank side pipe is an acute angle.

In the above configuration, the U-shaped pipe is arranged so as to be curved when viewed from the front. That is, the first connection pipe is curved when viewed from the front. Further, the first connection pipe is curved even when viewed from above. Thus, since the first connection pipe is curved in a plurality of directions, even if the housing vibrates in various directions due to compression of the refrigerant, the vibration can be absorbed by the first connection pipe. Therefore, damage to the first connection pipe or the like due to vibration can be suppressed.

In addition, in the compressor according to one aspect of the present disclosure, the housing-side pipe, the oil level tank-side pipe, and the U-shaped pipe have one curved portion.

In the above configuration, the housing-side pipe, the oil level tank-side pipe, and the U-shaped pipe have one curved portion. As a result, each pipe can be manufactured by bending the straight pipe only once. Therefore, each pipe can be manufactured easily.
In addition, since each pipe has a relatively simple shape, the assembling work can be facilitated.

1 Compressor 3 Leg 11 Housing 12 Rotary Compression Mechanism 13 Scroll Compression Mechanism 14 Electric Motor 15 Rotational Shaft (Rotating Shaft)
15a Oil supply hole 21 Main body 22 Upper cover 23 Lower cover 31 Upper bearing 31a Oil return hole 31b Vertical hole 32 Lower bearing 33 Suction pipe 34 Discharge pipe 38 Rotor 38a Rotor passage 38b Oil separation plate 39 Stator 39a Stator passage 39b Upper coil End 39c Lower coil end 41 Eccentric shaft 42 Rotor 43 Guide pipe 44 Cylinder 45 Cover 45a Suction opening 48 Bolt 49 Oil pump 51 Fixed scroll 52 End plate 52a Discharge hole 53 Fixed wrap 54 Balance weight 55 Bushing 56 Eccentric shaft 57 Rotation Scroll 58 End plate 59 Orbiting wrap 60 Oil level tank 60a Main body

60b Upper lid

60c Lower lid 61 Lower pipe (second connection pipe)
62 equalizing pipe (first connecting pipe)
63 Balance weight chamber 65 Oil separator oil return pipe 67 Oil return pipe 68 Boss 70 Rod member 75 Stabilizing plate 81 Housing side pipe 81a Housing side horizontal pipe 81b Housing side vertical pipe 81c Housing side expanded pipe 82 Oil level tank side pipe 82a Oil level Tank side horizontal pipe 82b Oil level tank side vertical pipe 82c Oil level tank side expanded pipe portion 83 U-shaped pipe 86 Housing side lower pipe 86a Lower expanded pipe portion 87 Oil level tank side lower pipe 90 Bracket C1 Compression chamber C2 Compression chamber FL Installation surface O1 Oil reservoir X axis

Claims

a rotating shaft portion that is driven to rotate;
a compression mechanism connected to one end of the rotating shaft portion for compressing a refrigerant;
a housing that accommodates the rotating shaft and the compression mechanism and has an oil reservoir below;
an oil level tank provided adjacent to the housing for measuring the height of the oil surface of the oil reservoir;
a first connection pipe having one end connected to an adjacent side surface of the housing adjacent to the oil level tank and connecting the housing and the oil level tank;
a second connection pipe having one end connected to the adjacent side surface and connecting the housing and the oil level tank;
The first connection pipe includes a housing side pipe connected to the housing, an oil level tank side pipe connected to the oil level tank, and a U-shape connecting the housing side pipe and the oil level tank side pipe. a U-shaped pipe, and
The U-shaped pipe and the housing-side pipe are connected so that one is inserted into the other from above or below,
The U-shaped pipe and the oil level tank side pipe are connected to each other such that one is inserted from above or below the other.
The compressor according to claim 1, wherein one end of said U-shaped pipe is inserted into said housing side pipe from above and the other end is inserted into said oil level tank side pipe from above.
The compressor according to claim 2, wherein the end portion of the housing-side pipe into which the U-shaped pipe is inserted is provided with an enlarged pipe portion having an inner diameter larger than that of other portions.
The U-shaped pipe is arranged so as to be curved when viewed from the front,
4. The compression according to any one of claims 1 to 3, wherein the first connection pipe is curved so that the angle formed by the housing-side pipe and the oil level tank-side pipe is an acute angle when viewed from above. machine.
The compressor according to any one of claims 1 to 4, wherein the housing-side pipe, the oil level tank-side pipe, and the U-shaped pipe have one curved portion.