JP2014134132A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor in which an outflow of lubricating oil of the compressor is reduced and in which a mechanism for supplying lubricating oil to a compression mechanism part has a simple configuration.SOLUTION: A compressor comprises: a compression mechanism part 4 including a fixed scroll, a turning scroll, and a main bearing member 51 for rotatably supporting a shaft for driving the turning scroll; and an electric motor part. In the compressor, an oil separator 56 for separating oil from refrigerant gas discharged from the compression mechanism part 4 is included on the back of a main bearing 42, and the oil separator 56 comprises an upper space 6, an inflow part 55, discharge gas communicating holes 7, a lubricating oil communicating hole 52, and a lubricating oil passage 54.

Description

  The present invention relates to a compressor that compresses a fluid, and more particularly, to a compressor that is used in an automobile air conditioner or the like.

  In general, a compressor used in a refrigeration cycle is filled with lubricating oil to ensure the reliability of the sliding portion. Since the lubricating oil and the refrigerant gas mix with each other, various methods have been devised to efficiently separate the lubricating oil and the refrigerant gas in the compressor so that the lubricating oil does not flow into the refrigeration cycle along with the discharge gas. (For example, refer to Patent Document 1).

  In the horizontal compressor disclosed in Patent Document 1, the partition member having an opening in the upper portion reduces the lubricating oil in the casing from being stirred out by the gas flow and flowing out.

JP 2007-262294 A

  However, the conventional configuration has a problem in that the lubricating oil is agitated and flows out by the motor rotor, thereby reducing the reliability of the compressor.

  The present invention solves the above-mentioned conventional problems, by separating the discharge gas and the lubricating oil from the compression mechanism portion by the configuration of the passage, and supplying the sliding portion in the communication passage near the compression mechanism portion, A complicated oil supply mechanism (pumping oil with a pump and supplying it through the shaft) becomes unnecessary. In addition, since the lubricating oil supply path can be shortened, the time until refueling is shortened. Furthermore, since it is possible to prevent the lubricating oil from flowing out during stirring by the motor rotor, it is possible to provide an inexpensive compressor that improves the cycle efficiency and the reliability of the compressor.

  In order to solve the above-described conventional problems, the present invention is directed to the discharge gas from the compression mechanism portion being led to the upper space by the communicating passage, and since the cross-sectional area thereof is relatively large, the flow velocity is reduced, By colliding, the mist-like lubricating oil becomes oil droplets. As a result, the lubricating oil and the refrigerant gas are separated. Refrigerant gas with less lubricating oil mist is discharged from the upper communication hole into the space where the motor is installed, and the separated lubricating oil is supplied to the compression mechanism sliding portion through the lower communication path.

  As a result, it is possible to simplify the configuration of improving the reliability and reducing the supply of the lubricating oil to the sliding portion by reducing the outflow amount of the lubricating oil.

  As described above, the present invention can provide a compressor capable of reducing the cost by improving the reliability by reducing the outflow amount of the lubricating oil and simplifying the configuration of supplying the lubricating oil to the sliding portion. .

Sectional drawing of the electric compressor in Embodiment 1 of this invention The figure explaining the structure of the passage of the discharge gas from a compression mechanism part The figure explaining the communicating hole where the refrigerant gas after lubricating oil separation is discharged The figure explaining the structure of the passage of discharge gas, and the communicating hole in which the refrigerant gas after lubricating oil separation is discharged

  A first aspect of the invention is a compression mechanism including a fixed scroll, an orbiting scroll, a compression mechanism portion including a main bearing member that supports a shaft that drives the orbiting scroll, and an electric motor portion that drives the compression mechanism portion. In the machine, an oil separator that separates oil from the refrigerant gas discharged from the compression mechanism portion is provided on a back surface of the main bearing, the oil separator includes an upper space that separates oil from the refrigerant gas, and the compression An inflow part for allowing the refrigerant gas discharged from the mechanism part to flow into the upper space, a discharge gas communication hole for sending the refrigerant from which the oil has been separated into the compressor, and the separated oil to the compression mechanism sliding part The structure has a lubricating oil communication hole to be discharged, and a lubricating oil passage that connects the upper space and the lubricating oil communication hole. With this configuration, it is possible to improve the reliability by reducing the outflow amount of the lubricating oil and simplify the configuration of supplying the lubricating oil to the sliding portion.

  In the second invention, the cross-sectional area of the upper space is larger than the cross-sectional area of the inflow portion. With this configuration, the lubricating oil and the refrigerant gas can be more reliably separated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of an electric compressor according to Embodiment 1 of the present invention.

  FIG. 1 shows one example in the case of a horizontal type electric compressor installed sideways by a mounting leg 2 around a body portion of the electric compressor 1. The electric compressor 1 includes a main body casing 3. A motor 5 is housed therein, and a compression mechanism 4 that is bolted to the main body casing 3 in the axial direction is driven. Further, the motor 5 is driven by the motor drive circuit unit 101.

  The refrigerant to be handled is a gas refrigerant, and a liquid such as the lubricating oil 13 is employed as a liquid to be used for lubrication of each sliding part and a seal of the sliding part of the compression mechanism part 4. The lubricating oil 13 is compatible with the refrigerant. However, the present invention is not limited to these.

  Basically, the compressor mechanism 4 and the motor 5 for sucking, compressing and discharging the refrigerant may be any compressor configured in a sealed container, and the following description limits the description of the scope of claims. is not.

  The electric compressor 1 is of a scroll type as one example, and the motor 5 moves the movable scroll in a circular orbit with respect to the fixed scroll via the drive shaft 14. As shown in FIG. 1, the compression space 10 formed by meshing the fixed scroll and the movable scroll, whose blades rise from the fixed end plate 11a and the swivel end plate 12a, moves and changes the volume of the refrigerant to return from the external cycle. Suction, compression, and discharge to an external cycle are performed through a suction port 8 provided in the compression mechanism unit 4 and a discharge port 9 provided in the main body casing 3.

  At the same time, the discharge gas guided by the passage 63 communicating from the compression mechanism section 4 flows from the discharge gas communication hole 7 to the upper space 6 above the compressor, and the lubricating oil 13 separated in the upper space 6 is compressed by the compressor. It flows through the downward lubricating oil passage 54.

The lubricating oil 13 enters the lubricating oil communication hole 52 through the lubricating oil passage 54, and is then supplied to the liquid reservoir 22 of the compression mechanism section. A part of the lubricating oil 13 supplied to the liquid reservoir 22 is supplied to the back side of the outer peripheral portion of the swirl spiral part 12 through the swirl spiral part 12 to a predetermined restriction base such as a restriction 23 to back up the swirl spiral part 12. To do. Lubricating oil 13 is supplied to a holding groove 25 that holds a tip seal 24 that is an example of a sealing member between the swirl spiral part 12 and the fixed spiral part 11 at the tip of the blade of the swirl spiral part 12 to fix and rotate each spiral. Sealing and lubrication between the portions 11 and 12 are achieved. Further, another part of the lubricating oil 13 supplied to the liquid reservoir 22 lubricates the bearings 42 and 43 through the eccentric bearing 43, the liquid reservoir 21 and the main bearing 42, and then flows out to the motor 5 side. Discharge from the discharge port 9 to the external cycle.

  The motor 5 is configured such that the drive shaft 14 can be rotationally driven by a rotor 5b in which the stator 5a is fixed to the main body casing 3 by bolts 17 and is fixed around the middle of the drive shaft 14. The main bearing member 51 is fitted to the open end of the main casing 3 and is fixed by a bolt or the like (not shown) while being sandwiched between the fixed spiral portion 11 and the sub casing 102, and the compression mechanism portion 4 side of the drive shaft 14 is fixed. The main bearing 42 is used for bearing. Furthermore, a scroll compressor is configured by sandwiching the swirl spiral portion 12 between the main bearing member 51 and the fixed spiral portion 11. Between the main bearing member 51 and the swirl spiral portion 12, a rotation restraint portion 57 for preventing the rotation of the swirl spiral portion 12 such as an Oldham ring and causing a circular motion is provided, and the drive shaft 14 is interposed via the eccentric bearing 43. The swirl spiral part 12 is connected to the swirl spiral part 12 so that the swirl spiral part 12 can be swung on a circular orbit.

  The compression mechanism section 4 is provided with a discharge hole 31 and a reed valve 31a, and is opened to a discharge chamber 62 formed between the sub casing 102 and the discharge mechanism 31. The discharge chamber 62 communicates with the lubricating oil communication hole 52 through the fixed spiral portion 11 and the main bearing member 51, and the discharge port 9 between the compression mechanism portion 4 and the end wall 3a through the upper space 6 positioned at the upper portion of the compressor. It leads to the motor 5 side with

  The motor drive circuit unit 101 is configured by accommodating a circuit board 103 and an electrolytic capacitor (not shown) on the opposite side of the suction chamber 61 and the discharge chamber 62 with an end wall 102 a interposed in the sub casing 102. Is mounted with an IPM (intelligent power module) 105 including a switching element having a high heat generation degree. The motor drive circuit unit 101 is electrically connected to the motor 5 and the like via a compressor terminal (not shown). The motor 5 is driven by the motor drive circuit unit 101 while monitoring necessary information such as temperature. For this reason, the motor drive circuit unit 101 is provided with a harness connector (not shown) for electrical connection with the outside.

  As described above, the motor 5 is driven by the motor drive circuit unit 101 and causes the compression mechanism unit 4 to move in a circular orbit via the drive shaft 14. At this time, the compression mechanism section 4 is supplied with the lubricating oil 13 from the lubricating oil passage 54 through the lubricating oil communication hole 52 and is subjected to lubrication and sealing action, while returning from the refrigeration cycle through a suction hole (not shown) provided in the fixed spiral section 11. The refrigerant is sucked in, compressed, and discharged from the discharge hole 31 to the discharge chamber 62.

  In the electric compressor 1 having the above configuration, a configuration in which the discharge gas passage from the compression mechanism unit 4 is configured as shown in FIG. FIG. 2 is a diagram illustrating the configuration of the passage of the discharge gas from the compression mechanism. FIG. 3 is a view for explaining a communication hole through which refrigerant gas after lubricating oil separation is discharged.

The gas discharged from the compression mechanism is guided to the upper space 6 by a passage. More specifically, the discharge gas flows into the oil separator 56 from the inflow portion 55 through the fixed scroll and the main bearing member. In addition to the decrease in flow velocity due to the expansion of the cross-sectional area of the flow path in the upper space 6 provided in the oil separator, the mist-like lubricating oil contained in the discharge gas becomes oil droplets along the wall surface due to the collision between the discharge gas and the wall surface. . Thereby, the lubricating oil is supplied from the lubricating oil communication hole 52 to the sliding portion of the compression mechanism through the lower lubricating oil passage 54. The discharge gas with less lubricating oil mist is discharged into the space where the motor is installed from the discharge gas communication hole 7 provided in the upper part shown in FIG.

  As described above, the electric compressor according to the present invention does not require the conventional complicated oil supply mechanism (pumping up the oil with a pump and supplying it through the shaft) for supplying the lubricating oil. Since it can be shortened, the time until refueling is shortened. In addition, since it is possible to prevent the lubricating oil from flowing out during stirring by the motor rotor, it is possible to increase the reliability of the sliding portion of the compressor, increase the efficiency of the refrigeration cycle, and reduce the cost.

  The present invention can be applied not only to an electric compressor for a vehicle but also to a compressor for various uses such as an air conditioner, a hot water supply, and a refrigerator.

DESCRIPTION OF SYMBOLS 1 Electric compressor 3 Main body casing 4 Compression mechanism part 5 Motor 5a Stator 5b Rotor 6 Upper space 7 Discharge gas communication hole 8 Suction port 9 Discharge port 10 Compression space 11 Fixed spiral part 11a Fixed end plate 12 Swirl spiral part 12a Swivel end plate 13 Lubricating oil 14 Drive shaft 42 Main bearing 43 Eccentric bearing 51 Main bearing member 52 Lubricating oil communication hole 54 Lubricating oil passage 55 Inflow portion 56 Oil separator

Claims (2)

In the compressor having a fixed scroll, a turning scroll, a compression mechanism portion including a main bearing that pivotally supports a shaft that drives the turning scroll, and an electric motor portion that drives the compression mechanism portion.
An oil separator that separates oil from refrigerant gas discharged from the compression mechanism section is provided on the back surface of the main bearing,
The oil separator is
An upper space for separating oil from the refrigerant gas;
An inflow part for allowing the refrigerant gas discharged from the compression mechanism part to flow into the upper space;
A discharge gas communication hole for sending the refrigerant from which the oil has been separated into a sealed container;
A lubricating oil communication hole for discharging the separated oil to the compression mechanism sliding portion;
A lubricating oil passage communicating the upper space and the lubricating oil communication hole;
Having a compressor. The compressor according to claim 1, wherein a cross-sectional area of the upper space is larger than a cross-sectional area of the inflow portion.