compressor

Abstract

To provide a compressor in which pipes connecting a housing and an oil level tank can be appropriately connected to the housing and the oil level tank.SOLUTION: A compressor comprises: an oil level tank 60 provided adjacently to a housing 11, and for measuring the height of an oil level of an oil sump; a pressure equalization pipe 62 of which one end is connected to an adjacent side surface 11a of the housing 11, and connecting the housing 11 and the oil level tank 60; and a lower pipe 61 of which one end is connected to the adjacent side surface 11a, and connecting the housing 11 and the oil level tank 60. The pressure equalization pipe 62 comprises 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 U-shaped pipe 83 having a U-shape connecting the housing side pipe 81 and the oil level tank side pipe 82. The U-shaped pipe 83 is inserted into the housing side pipe 81 and the oil level tank side pipe 82 from above.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a compressor. [Background Art]

[0002] A hermetic compressor including a compression mechanism in a housing is known. As a hermetic compressor, one is known which includes another device provided adjacent to a compressor body, apart from the compressor body whose housing forms an outer shell, and connects the compressor body and the other device via a pipe (for example, Patent Document 1). Patent Document 1 describes a compressor including: a hermetic container that accommodates a compression mechanism; a discharge muffler provided adjacent to the hermetic container; and a discharge pressure connection pipe and an oil return pipe that connect the hermetic container and the discharge muffler. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2008-175066 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Pipes used in compressors, particularly compressors using carbon dioxide as a refrigerant, are designed to have a large wall thickness to withstand high pressure, and are therefore difficult to deform. For this reason, when a pipe that connects the housing of the compressor and another device adjacent to the housing (hereinafter referred to as an "adjacent device") is provided, this pipe is unlikely to absorb tolerances of each component. Therefore, in such a compressor, tolerances of each component cannot be sufficiently absorbed, and there is a possibility that the pipe cannot be connected to appropriate positions of the housing and the adjacent device. In particular, when there are two or more pipes connecting the housing and the adjacent device, if one of the pipes is attached, there was a possibility that another pipe cannot be attached to an appropriate position due to tolerances of each component.

[0005] In the compressor described in Patent Document 1, the discharge pressure connecting pipe is connected to the side of the outer surface of the sealed container that is opposite to the side adjacent to the discharge muffler (adjacent device) (hereinafter referred to as the "non-adjacent side"). In such a case, since it is necessary to extend the discharge pressure connecting pipe to the non-adjacent side, the length of the discharge pressure connecting pipe becomes longer. Therefore, compared to the case where the discharge pressure connecting pipe is short, it is easier to absorb the tolerances of each component with the entire discharge pressure connecting piping. Consequently, it was relatively easy to connect the discharge pressure connecting pipe to the appropriate position on the sealed container and the discharge muffler.

[0006] On the other hand, for various reasons, piping connecting a housing to an adjacent device is sometimes connected to the side of the housing's outer surface that is adjacent to the adjacent device (hereinafter referred to as the "adjacent side"). In such cases, the length of the piping is shorter compared to when it is connected to a non-adjacent side. As a result, it is difficult to absorb the tolerances of each component across the entire piping, which has led to the problem of difficulty in connecting the piping to the appropriate position on the housing and adjacent device.

[0007] This disclosure has been made in view of these circumstances and aims to provide a compressor that can appropriately connect the piping connecting the housing and the oil level tank to the housing and the oil level tank. [Means for solving the problem]

[0008] To solve the above problems, the compressor of this disclosure employs the following means. A compressor according to one aspect of the present disclosure comprises a rotary shaft that is rotationally driven, a compression mechanism connected to one end of the rotary shaft for compressing a refrigerant, a housing that houses the rotary shaft and the compression mechanism and has an oil reservoir below it, an oil level tank provided adjacent to the housing for measuring the height of the oil level in the oil reservoir, a first connecting pipe having one end connected to an adjacent side surface of the housing which is adjacent to the oil level tank, and connecting the housing and the oil level tank, and a second connecting pipe having one end connected to the adjacent side surface, and connecting the housing and the oil level tank, wherein the first connecting pipe has a housing-side pipe connected to the housing, an oil level tank-side pipe connected to the oil level tank, and a U-shaped U-pipe connecting the housing-side pipe and the oil level tank-side pipe, wherein the U-shaped pipe and the housing-side pipe are connected such that one is inserted into the other from above or below, 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. [Effects of the Invention]

[0009] According to this disclosure, the piping connecting the housing and the oil level tank can be properly connected to the housing and the oil level tank. [Brief explanation of the drawing]

[0010] [Figure 1] This is a longitudinal cross-sectional view showing a compressor according to one embodiment of the present disclosure. [Figure 2] Figure 1 is a longitudinal cross-sectional view showing the main components of the compressor. [Figure 3] This is a cross-sectional view along the cutting line III-III in Figure 2. [Figure 4] Figure 1 is a front view showing the main components of the compressor (oil level tank). [Figure 5] Figure 1 is a plan view showing the main components of the compressor (oil level tank). [Figure 6]Figure 1 is a bottom view showing the main components of the compressor (oil level tank). [Modes for carrying out the invention]

[0011] Embodiments relating to this disclosure will be described below with reference to the drawings. As shown in Figure 1, the compressor 1 is used in an air conditioner and compresses a refrigerant R, such as carbon dioxide, in two stages. The compressor 1 is fixed to the mounting surface FL via legs 3. The compressor 1 comprises 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.

[0012] The housing 11 comprises a cylindrical main body 21 and an upper lid 22 and a lower lid 23 that close the upper and lower openings of the main body 21. The inside of the housing 11 forms a sealed space.

[0013] The rotating shaft 15 is provided inside the housing 11, extending vertically along axis X. The upper end of the rotating shaft 15 is rotatably supported by an upper bearing 31. The lower end of the rotating shaft 15 is rotatably supported by a lower bearing 32.

[0014] The electric motor 14 is positioned at the center of the rotation shaft 15 in the longitudinal direction and on the outer circumference of the rotation shaft 15, and rotates the rotation shaft 15 about axis X. The electric motor 14 has a rotor 38 fixed to the outer circumference of the rotation shaft 15, and a stator 39 that is radially opposite to the rotor 38 with a gap between it and the outer circumference of the rotor 38, and is fixed to the inner wall of the main body portion 21 of the housing 11 by shrink fitting or the like.

[0015] 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 38b is fixed to an upper portion of the rotor 38. The oil separation plate 38b has a disk shape and is disposed so as to extend in the horizontal direction. The oil separation plate 38b rotates around the axis X together with the rotor 38.

[0016] A plurality of stator passages 39a are formed at predetermined angular intervals in the circumferential direction on an outer periphery of the stator 39 (this will be specifically described later with reference to FIG. 3). As shown in FIG. 1, an upper coil end 39b formed by folding a winding is positioned at an upper portion of the stator 39, and a lower coil end 39c formed by folding a winding is positioned at a lower portion of the stator 39. The electric motor 14 is connected to a power supply via an inverter (not shown), and rotates the rotating shaft 15 with a variable frequency.

[0017] The rotary compression mechanism 12 is provided inside the housing 11 on the lower end (the other end) side of the rotating shaft 15. In the present embodiment, the rotary compression mechanism 12 is of two-cylinder type, and includes an eccentric shaft portion 41 provided on the rotating shaft 15, a rotor 42 fixed to the eccentric shaft portion 41, which is eccentric with respect to the axis X as the rotating shaft 15 rotates and rotates within the compression chamber C1, and a cylinder 44 in which the compression chamber C1 is formed.

[0018] 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 is discharged from the guide pipe 43 to a region below the electric motor 14 in the housing 11 via the lower bearing 32 (specifically, a discharge space formed inside the lower bearing 32).

[0019] The cylinder 44 is fixed to the lower bearing 32 from below by bolts 48. Below the cylinder 44, an oil pump 49 fixed together with the cylinder 44 by the bolts 48 is provided. Oil is sucked from the oil sump O1 at the lower part of the housing 11 by the oil pump 49, passes through the oil supply hole 15a penetrating along the axis X of the rotating shaft 15, and is guided to the upper bearing 31 side.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The orbiting wrap 59 meshes with the fixed wrap 53 to form a compression chamber C2 between the orbiting wrap 59 and the fixed wrap 53 for compressing refrigerant R.

[0025] A counterweight chamber 63 is formed between the recess on the central side of the upper bearing 31 and the lower part of the orbiting scroll 57. In the counterweight chamber 63, the counterweight 54 rotates together with the rotating shaft 15.

[0026] The refrigerant R, compressed by the rotary compression mechanism 12 and discharged into the housing 11, is drawn into the compression chamber C2 from the outer circumference of the scroll compression mechanism 13 and compressed toward the center. The compressed refrigerant R is discharged to the outside of the housing 11 through the discharge hole 52a of the fixed scroll 51 and the discharge pipe 34.

[0027] Below the upper bearing 31, a cover 45 is provided to cover the upper bearing 31. The cover 45 is formed from sheet metal and has a roughly conical shape that widens from bottom to top. The upper end on the outer circumference of the cover 45 is fixed to the upper bearing 31 by a bolt 45b (see Figure 2).

[0028] An intake opening 45a is provided at the lower end of the cover 45. That is, the intake opening 45a faces downward and is an annular region formed between the cover 45 and the rotating shaft 15. The cover 45 separates the space below the housing 11 from the space on the upper bearing 31 side, so that only the refrigerant drawn in from the intake opening 45a is guided to the scroll compression mechanism 13.

[0029] An oil level tank 60 is provided outside and below the housing 11. The oil level tank 60 is a hollow container and is connected to 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 inside the housing 11 by guiding oil from the reservoir O1 through the lower pipe (second connecting pipe) 61.

[0030] The downstream end of the oil separator return pipe 65 is connected to the lower side of the housing 11. The upstream end of the oil separator 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 O1 inside the housing 11 via the oil separator return pipe 65. The height at which the downstream end of the oil separator return pipe 65 is connected to the housing 11 is below the lower bearing 32.

[0031] An oil return pipe 67 is provided inside the housing 11, extending vertically while in contact with the inner wall of the housing 11. As shown in Figure 2, the oil return pipe 67 is provided such 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 located in the oil reservoir O1 at the bottom of the housing 11. The lower end of the oil return pipe 67 is fixed to the inner wall of the housing 11 via a rod-shaped member 70.

[0032] The oil return pipe 67 is provided to penetrate the space formed between the stator 39 and the housing 11. Specifically, as shown in Figure 3, notches are provided on 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. Coolant and oil are allowed to flow through these stator passages 39a. The two oil return pipes 67 are inserted through one or more of these stator passages 39a.

[0033] As can be seen in Figure 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. Furthermore, as shown in Figure 2, the stabilizing plate 75 is fixed to the lower surface of the lower bearing 32 (see Figure 1). The stabilizing plate 75 is fixed to the lower bearing 32 (specifically, the radially protruding legs of the lower bearing 32) by bolts. The stabilizing plate 75 is a disc with an opening formed in the center. The stabilizing plate 75 stabilizes the oil surface by covering the area above the oil surface of the oil reservoir O1.

[0034] Next, the oil level tank 60, the pressure equalizing pipe 62 connecting the housing 11 and the oil level tank 60, and the lower piping 61 will be explained using Figures 4 to 6. As shown in Figure 4, the oil level tank 60 is positioned adjacent to the housing 11. The oil level tank 60 comprises a cylindrical main body 60a and an upper lid 60b and a lower lid 60c that close the upper and lower openings of the main body 60a. The inside of the oil level tank 60 forms a sealed space. The oil level tank 60 measures the height of the oil level in the oil reservoir O1, for example, by a capacitance sensor (not shown) provided inside. However, the method by which the oil level tank 60 measures the oil level is not limited to this. The oil level may be measured by other methods.

[0035] The oil level tank 60 is fixed to the housing 11 by a bracket 90. The bracket 90 fixes the main body 60a of the oil level tank 60 to the main body 21 of the housing 11.

[0036] As shown in Figure 4, the lower piping 61 connects the lower cover portion 23 of the housing 11 to the lower cover portion 60c of the oil level tank 60. Furthermore, as shown in Figure 6, one end of the lower piping 61 is connected to the adjacent side surface 11a of the housing 11, which is the side adjacent to the oil level tank 60, and the other end is connected to the outer circumferential surface of the oil level tank 60. The other end of the lower piping 61 may also be connected to the adjacent side surface of the outer circumferential surface of the oil level tank 60, which is the side adjacent to the housing 11. The lower piping 61 is made of a metal material (for example, copper). However, the material of the lower piping 61 is not limited to this.

[0037] Furthermore, the lower piping 61 includes a housing-side lower piping 86 connected to the housing 11 and an oil level tank-side lower piping 87 connected to the oil level tank 60. The housing-side lower piping 86 extends in a straight line. The housing-side lower piping 86 is also provided with a lower expanded section 86a at its tip (the end on the oil level tank-side lower piping 87 side), which has a larger inner diameter than the rest of the pipe. The oil level tank-side lower piping 87 is inserted into the lower expanded section 86a. The oil level tank-side lower piping 87 is curved when viewed from above. The angle of curvature of the oil level tank-side lower piping 87 (the smaller angle) is the same as the angle of curvature 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 piping 87 (the end on the housing-side lower piping 86 side) is smaller than the inner diameter of the lower expanded section 86a, and it is inserted into the lower expanded section 86a. The lower pipe 86 on the housing side and the lower pipe 87 on the oil level tank side are fixed together by brazing the portion inserted into the lower expanded section 86a.

[0038] As shown in Figures 4 and 5, the pressure equalizing pipe 62 equalizes the pressure inside the housing 11 and the oil level tank 60 by connecting them. As shown in Figure 4, the pressure equalizing pipe 62 connects the main body 21 of the housing 11 and the upper lid 60b of the oil level tank 60. As shown in Figure 1, the pressure equalizing pipe 62 is located below the center of the housing 11 in the longitudinal direction (axis X direction) and above the oil reservoir O1. More specifically, the pressure equalizing pipe 62 is connected between the electric motor 14 and the lower bearing 32. Furthermore, as shown in Figure 5, one end of the pressure equalizing pipe 62 is connected to the adjacent side surface 11a of the housing 11, which is the side adjacent to the oil level tank 60, and the other end is connected to the outer circumferential surface of the oil level tank 60. The other end of the pressure equalizing pipe 62 may be connected to the adjacent side surface of the outer circumferential surface of the oil level tank 60, which is the side adjacent to the housing 11. The pressure equalizing tube 62 is made of, for example, a metal material (for example, copper). However, the material of the pressure equalizing tube 62 is not limited to this.

[0039] The adjacent side surface 11a of the housing 11 is the outer circumferential surface of the housing 11 located within a 90-degree angle with respect to the center line L, which is the line connecting the center point of the housing 11 (the point through which axis X passes) and the center point of the oil level tank 60 in the cross-section of the compressor 1. In other words, the adjacent side surface 11a is the outer circumferential surface of the housing 11 located within a 180-degree circumferential range centered on the intersection point P of the center line L and the housing 11. Similarly, the adjacent side surface of the oil level tank 60 is the outer circumferential surface of the oil level tank 60 located within a 90-degree angle with respect to the center line L. The housing-side piping 81 only needs to be connected to any of the adjacent side surfaces 11a, but in this embodiment, it is connected to the adjacent side surfaces 11a within a range that forms a 45-degree angle with respect to the center line L.

[0040] Furthermore, as shown in Figures 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 U-shaped pipe 83 connecting the housing-side pipe 81 and the oil level tank-side pipe 82.

[0041] As shown in Figures 4 and 5, the housing-side piping 81 integrally comprises a housing-side horizontal pipe 81a extending substantially horizontally from the housing 11, and a housing-side vertical pipe 81b that bends substantially at a right angle from the tip of the housing-side horizontal pipe 81a and extends upward. The tip of the housing-side piping 81 (the tip of the housing-side vertical pipe 81b) is provided with a housing-side expanded section 81c, which has a larger inner diameter than the rest of the pipe. The inner diameter of the housing-side expanded section 81c is larger than the outer diameter of the U-shaped pipe 83, which will be described later. The housing-side expanded section 81c opens upward.

[0042] As shown in Figures 4 and 5, the oil level tank side piping 82 integrally comprises an oil level tank side horizontal pipe 82a extending substantially horizontally from the oil level tank 60, and an oil level tank side vertical pipe 82b bending substantially at a right angle from the tip of the oil level tank side horizontal pipe 82a and extending upward. The tip of the oil level tank side piping 82 (the tip of the oil level tank side vertical pipe 82b) is provided with an oil level tank side expanded pipe section 82c, which has a larger inner diameter than the rest of the pipe. The inner diameter of the oil level tank side expanded pipe section 82c is larger than the outer diameter of the U-shaped pipe 83, which will be described later. The oil level tank side expanded pipe section 82c opens upward.

[0043] As shown in Figure 5, the horizontal pipe 81a on the housing side and the horizontal pipe 82a on the oil level tank side are positioned such that, in a top view, the extensions of their respective central axes form an angle θ1. In this embodiment, the angle θ1 is acute. More specifically, in this embodiment, the angle θ1 is approximately 50 degrees. Note that the value of the angle θ1 is just an example and is not limited to this value. Also, as shown in Figure 4, the vertical pipe 81b on the housing side and the vertical pipe 82b on the oil level tank side are positioned approximately parallel to each other.

[0044] As shown in Figure 4, the U-shaped pipe 83 is curved so as to be folded 180 degrees when viewed from the front. That is, the U-shaped pipe 83 allows the fluid flowing inside to flow upward, then folds 180 degrees to allow it to flow downward. One end of the U-shaped pipe 83 is inserted from above into the housing-side expanded section 81c of the housing-side pipe 81. The other end of the U-shaped pipe 83 is inserted from above into the oil-level tank-side expanded section 82c of the oil-level tank-side pipe 82. The outer diameter of the U-shaped pipe 83 is smaller than the inner diameter of the housing-side expanded section 81c and the oil-level tank-side expanded section 82c.

[0045] The U-shaped pipe 83 and the housing-side pipe 81 are fixed together by brazing the portion inserted into the expanded section 81c on the housing side. The U-shaped pipe 83 and the oil level tank-side pipe 82 are fixed together by brazing the portion inserted into the expanded section 82c on the oil level tank side.

[0046] The compressor 1 with the above configuration operates as follows: The refrigerant evaporated in an evaporator (not shown) is drawn into the compressor 1 through the suction pipe 33 and compressed by the rotary compression mechanism 12. The refrigerant compressed by the rotary compression mechanism 12 is discharged into the housing 11 through the guide pipe 43. The refrigerant discharged into the housing 11 is drawn in through the intake opening 45a of the cover 45, passes through the flow path inside the cover 45, and is guided to the scroll compression mechanism 13 where it is compressed. The refrigerant compressed in the scroll compression mechanism 13 is discharged through the discharge hole 52a of the fixed scroll 51 and out of the discharge pipe 34 to an external gas cooler or condenser.

[0047] Oil is separated from the refrigerant discharged from the discharge pipe 34 by an oil separator (not shown). The separated oil is returned to the housing 11 through the oil separator return pipe 65 and stored in the oil reservoir O1.

[0048] The oil stored in the oil reservoir O1 is drawn up by the oil pump 49 and guided through the oil supply hole 15a formed in the rotating shaft 15 to the scroll compression mechanism 13. The oil guided to the scroll compression mechanism 13 lubricates the bearing portion of the upper bearing 31 and sliding parts such as the bush 55, and is then returned to the oil reservoir O1 below. Of the lubricated oil, the oil guided to the balance weight chamber 63 is guided through the oil return hole 31a and vertical hole 31b (see Figure 2) formed in the upper bearing 31 to the oil return pipe 67.

[0049] The oil, guided to the oil return pipe 67, passes through its internal flow path and is discharged from its lower end, returning to the oil reservoir O1.

[0050] According to this disclosure, the following effects are achieved. In this embodiment, both the pressure equalizing pipe 62 and the lower pipe 61 are connected to the adjacent side surface 11a of the housing 11. Therefore, the lengths of the pressure equalizing pipe 62 and the lower pipe 61 are shorter compared to the case where the pressure equalizing pipe 62 and the lower pipe 61 are connected to the side of the housing 11 opposite to the adjacent side surface 11a. Consequently, the compressor 1 can be made smaller.

[0051] In this embodiment, the U-shaped pipe 83 and the housing-side pipe 81 are connected such that one is inserted into the other from above or below, and the U-shaped pipe 83 and the oil level tank-side pipe 82 are also connected such that one is inserted into the other from above or below. Specifically, the U-shaped pipe 83 is inserted into the housing-side pipe 81 and the oil level tank-side pipe 82 from above. This allows for adjustment of the length to which the U-shaped pipe 83 is inserted, thereby absorbing vertical tolerances (deviations from the design) of each component. Furthermore, at the insertion points between the housing-side piping 81 and the oil level tank-side piping 82 and the U-shaped piping 83, a gap is created between the outer surface of one pipe (the pipe being inserted, which in this embodiment is the U-shaped piping 83) and the inner surface of the other pipe (the pipe being inserted, which in this embodiment is the housing-side piping 81 and the oil level tank-side piping 82). This gap allows for the absorption of horizontal tolerances of each component. In addition, since there are two insertion points (the connection point between the housing-side piping 81 and the U-shaped piping 83, and the connection point between the oil level tank-side piping 82 and the U-shaped piping 83), horizontal tolerances can be absorbed more effectively compared to the case where there is only one insertion point. In this way, the pressure equalizing pipe 62 can absorb tolerances in both the vertical and horizontal directions, so that both the pressure equalizing pipe 62 and the lower piping 61 can be properly connected to the housing 11 and the oil level tank 60.

[0052] Furthermore, in this embodiment, the U-shaped pipe 83 is inserted from above into the housing-side pipe 81 and the oil level tank-side pipe 82. This makes it easier to perform processing (for example, brazing) to connect the housing-side pipe 81 and the oil level tank-side pipe 82 to the U-shaped pipe 83.

[0053] Furthermore, in this embodiment, a housing-side expanded section 81c is provided at the end of the housing-side piping 81. Also, an oil-level tank-side expanded section 82c is provided at the end of the oil-level tank-side piping 82. This makes it easier to insert the U-shaped pipe 83 into the housing-side piping 81 and the oil-level tank-side piping 82. Furthermore, since the gap between the inner surface of the housing-side piping 81 and the outer surface of the U-shaped piping 83 becomes larger, it is possible to absorb horizontal tolerances more effectively.

[0054] Furthermore, in this embodiment, the U-shaped pipe 83 is arranged to be curved when viewed from the front. That is, the pressure equalizing pipe 62 is curved when viewed from the front. Also, the pressure equalizing pipe 62 is curved when viewed from above. In this way, the pressure equalizing pipe 62 is curved in multiple directions (vertical and horizontal). That is, the pressure equalizing pipe 62 is curved in three dimensions. As a result, even if the housing 11 vibrates in various directions due to the compression of the refrigerant, the vibration can be absorbed by the pressure equalizing pipe 62. Therefore, damage to the pressure equalizing pipe 62 and other components caused by vibration can be suppressed.

[0055] In this embodiment, the housing-side piping 81, the oil level tank-side piping 82, and the U-shaped piping 83 each have only one curved section. This allows each pipe to be manufactured by simply bending it once, compared to a straight pipe. Therefore, each pipe can be easily manufactured. Furthermore, since the shape of each pipe is relatively simple, assembly work can be simplified.

[0056] This disclosure is not limited to the embodiments described above, and can be modified as appropriate without departing from its essence. For example, in the above embodiment, an example was described in which the U-shaped pipe 83 is inserted from above into the housing-side pipe 81 and the oil level tank-side pipe 82, but the disclosure is not limited thereto. For example, instead of providing expanded sections in the housing-side pipe 81 and the oil level tank-side pipe 82, expanded sections may be provided at both ends of the U-shaped pipe 83, and the housing-side pipe 81 and the oil level tank-side pipe 82 may be inserted into the U-shaped pipe 83 from below.

[0057] The compressor described in the above-described embodiment can be understood, for example, as follows. A compressor according to one aspect of the present disclosure includes a rotationally driven rotating shaft (15), a compression mechanism (12, 13) connected to one end of the rotating shaft for compressing a refrigerant, a housing (11) housing the rotating shaft and the compression mechanism and having an oil reservoir (O1) below it, an oil level tank (60) provided adjacent to the housing for measuring the height of the oil level in the oil reservoir, a first connecting pipe (62) with one end connected to an adjacent side surface (11a) of the housing which is adjacent to the oil level tank, connecting the housing and the oil level tank, and a housing with one end connected to the adjacent side surface. The first connecting pipe comprises a second connecting pipe (61) connecting the sing to the oil level tank, the first connecting pipe having 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-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 such that one is inserted into the other from above or below, 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.

[0058] In the above configuration, both the first and second connecting pipes are connected to the adjacent side of the housing. Therefore, the lengths of the first and second connecting pipes are shorter compared to the case where the first and second connecting pipes are connected to the side of the housing opposite to the adjacent side. Consequently, the compressor can be made smaller. In the above configuration, the U-shaped pipe and the housing-side pipe are connected such that one is inserted into the other from above or below, and both 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. This allows for adjustment of the length of the insertion portion of the pipe to accommodate vertical tolerances of each component. Furthermore, at the insertion points between the housing-side piping and the oil level tank-side piping and the U-shaped piping, a gap is created between the outer surface of one pipe (the pipe being inserted) and the inner surface of the other pipe (the pipe being inserted). This gap allows for the absorption of horizontal tolerances of each component. In addition, since there are two insertion points (the connection point between the housing-side piping and the U-shaped piping, and the connection point between the oil level tank-side piping and the U-shaped piping), horizontal tolerances can be absorbed more effectively compared to a case with only one insertion point. In this way, the first connecting pipe can absorb both vertical and horizontal tolerances, allowing both the first and second connecting pipes to be properly connected to the housing and the oil level tank.

[0059] Furthermore, in one aspect of the present disclosure, the U-shaped piping has one end inserted into the housing-side piping from above, and the other end inserted into the oil level tank-side piping from above.

[0060] In the above configuration, a U-shaped pipe is inserted from above into the housing-side piping and the oil level tank-side piping. This makes it easier to perform the process of connecting the housing-side piping, the oil level tank-side piping, and the U-shaped pipe (for example, by brazing).

[0061] Furthermore, in one aspect of the present disclosure, the end of the housing-side piping into which the U-shaped piping is inserted is provided with an expanded section (81c) that has a larger inner diameter than the other sections.

[0062] In the above configuration, an expanded section is provided at the end of the housing-side piping. This makes it easier to insert the U-shaped pipe into the housing-side piping. Furthermore, the gap between the inner surface of the housing-side piping and the outer surface of the U-shaped piping becomes larger, allowing for greater tolerance in the horizontal direction.

[0063] Furthermore, in one aspect of the present disclosure, the U-shaped piping is arranged to be curved when viewed from the front, and the first connecting piping is curved such that, when viewed from above, the angle between the housing-side piping and the oil level tank-side piping is acute.

[0064] In the above configuration, the U-shaped piping is arranged so as to be curved when viewed from the front. That is, the first connecting piping is curved when viewed from the front. Furthermore, the first connecting piping is also curved when viewed from above. In this way, because the first connecting piping is curved in multiple directions, even if the housing vibrates in various directions due to the compression of the refrigerant, the vibration can be absorbed by the first connecting piping. Therefore, damage to the first connecting piping and other components caused by vibration can be suppressed.

[0065] Furthermore, in one aspect of the present disclosure, the housing-side piping, the oil level tank-side piping, and the U-shaped piping each have only one curved section.

[0066] In the above configuration, the housing-side piping, the oil level tank-side piping, and the U-shaped piping all have only one curved section. This allows each pipe to be manufactured by applying only one bend to a straight pipe during production. Therefore, each pipe can be easily manufactured. Furthermore, since the shape of each pipe is relatively simple, assembly work can be simplified. [Explanation of symbols]

[0067] 1. Compressor 3 legs 11 Housing 12 Rotary Compression Mechanism 13. Scroll Compression Mechanism 14 Electric motor 15. Rotating shaft (rotating shaft part) 15a Oil supply hole 21 Main body 22 Upper lid 23 Lower lid 31 Upper bearing 31a Oil return hole 31b Vertical hole 32 Lower bearing 33 Suction pipe 34 Discharge pipe 38 rotors 38a Rotor aisle 38b Oil Separation Plate 39 Status 39a Stator passage 39b Upper coil end 39c Lower coil end 41 Eccentric shaft part 42 rotors 43 Guide tube 44 cylinders 45 Cover 45a Suction opening 48 volts 49 Oil pump 51 Fixed Scroll 52 End plate 52a Discharge hole 53 Fixing Wrap 54 Balance weights 55 Bush 56 Eccentric shaft part 57 Rotating Scroll 58 End plate 59 Turning lap 60 Oil level tank 60a Main body 60b Upper lid part 60c Lower lid part 61 Lower piping (second connecting piping) 62 Pressure equalization pipe (first connecting pipe) 63 Balance Weight Room 65 Oil separator return oil pipe 67 Oil return pipe 68 Boss 70 Rod-shaped member 75 Stabilizing Plate 81 Housing-side piping 81a Horizontal piping on the housing side 81b Vertical piping on the housing side 81c Housing side expansion section 82 Oil level tank side piping 82a Horizontal piping on the oil level tank side 82b Vertical piping on the oil level tank side 82c Oil level tank side expanded section 83 U-shaped piping 86 Lower piping on the housing side 86a Lower pipe expansion section 87 Lower piping on the oil level tank side 90 bracket C1 Compression Chamber C2 Compression Chamber FL installation surface O1 Oil pool X axis

Claims

1. A rotating shaft that is driven to rotate, A compression mechanism connected to one end of the aforementioned rotating shaft portion for compressing the refrigerant, A housing that houses the rotating shaft and the compression mechanism and has an oil reservoir at the bottom, An oil level tank is provided adjacent to the housing and measures the height of the oil level in the oil reservoir. A first connecting pipe is provided, with one end connected to the adjacent side of the housing which is adjacent to the oil level tank, and the other end connected to the second adjacent side of the upper part of the oil level tank which is adjacent to the housing, thereby connecting the housing and the oil level tank. A second connecting pipe is provided, with one end connected to the adjacent side and the other end connected to the second adjacent side, connecting the housing and the oil level tank. The first connecting pipe comprises a housing-side pipe connected to the housing, an oil level tank-side pipe connected to the oil level tank, and a U-shaped U-pipe connecting the housing-side pipe and the oil level tank-side pipe. The housing-side piping comprises a housing-side horizontal pipe extending horizontally from the housing, and a housing-side vertical pipe that bends from one end of the housing-side horizontal pipe and extends vertically. The oil level tank side piping comprises an oil level tank side horizontal piping extending horizontally from the oil level tank, and an oil level tank side vertical piping that bends from one end of the oil level tank side horizontal piping and extends vertically. The U-shaped pipe and the housing-side pipe are connected such that the U-shaped pipe is inserted into the housing-side vertical pipe from above or below. A compressor in which the U-shaped pipe and the oil level tank side pipe are connected such that the U-shaped pipe is inserted from above or below relative to the vertical pipe on the oil level tank side.

2. The compressor according to claim 1, wherein 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.

3. The compressor according to claim 2, wherein the end of the housing-side piping into which the U-shaped piping is inserted is provided with an expanded pipe section having a larger inner diameter than the other sections.

4. The aforementioned U-shaped pipe is arranged to curve when viewed from the front, The compressor according to any one of claims 1 to 3, wherein the first connecting pipe is curved such that, in a top view, the angle between the housing-side pipe and the oil level tank-side pipe is acute.

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