JP2674113B2 - Horizontal scroll compressor - Google Patents

Description

The present invention relates to a horizontal scroll compressor suitable for use in equipment such as refrigerators and air conditioners.

[Conventional technology]

Generally, the operating principle of this type of scroll compressor can be explained with reference to FIGS. 7 (a) to 7 (d).

That is, the fixed scroll 1 is fixed at a predetermined position, and the orbiting scroll 2 is combined with the fixed scroll 1, and the fixed scroll 1 revolves around a fixed point O with the interval O-O 'as a radius. Along with this, the swing scroll 2 0 °, 90 °, 180
The turning positions at ° and 270 ° are as shown in Fig. 5.
Further, as the orbiting scroll 2 orbits, the volume of the crescent-shaped compression chamber 3 formed between the fixed scroll 1 and the orbiting scroll 2 is gradually reduced toward a discharge port (not shown), As a result, the gas taken into the compression chamber 3 is compressed and discharged from the discharge port (not shown).
At this time, the distance between O and O'shown in FIG. 1 is kept constant, and if the spacing between the spirals (corresponding to the pitch of the spirals) is a and the thickness is t, then O-O '= at / 2. Become.

Next, a conventional scroll compressor will be described with reference to FIG. 8 (disclosed in Japanese Patent Laid-Open No. 59-120796). In the figure, reference numeral 11 denotes a fixed scroll, 11a and 11b denote discharge ports and suction ports provided on the center side and the outer side of the fixed scroll 11, 12 denotes an orbiting scroll combined with the fixed scroll 11, 13 Is a compression chamber formed between the scrolls 11 and 12, and 14 is a bearing support fixed in the shell 15 by means such as press fitting. The fixed scroll 11 is fixed to the bearing support 14 by bolting, for example. Reference numeral 16 denotes a crankshaft having a large diameter portion 16a rotatably attached to the bearing support 14. Large diameter part 16 of this crankshaft 16
A shaft 12a of the orbiting scroll 12 is eccentrically fitted to a. An Oldham coupling 17 is provided between the bearing support 14 and the orbiting scroll 12. The Oldham coupling 17 is configured such that the orbiting scroll 12 does not rotate and is slidable in the radial direction and pivots as the crankshaft 16 rotates. Further, 18 is a bearing sliding portion of the orbiting scroll 12 and the bearing support 14, 19 is a motor stator concentrically mounted in the shell 15 on one side of the bearing support 14 by means such as press fitting or bolting, and 20 is this. The motor rotors are concentrically arranged in the motor stator 19 via an air gap 21 and fixed to the crankshaft 16, 22 and 23 are balancers attached to the motor rotor 20 by means such as caulking, and 24 is a discharge port 11a. A discharge pipe communicating with the reference numeral 25 is a suction pipe communicating with the inside of the shell 15.
These two pipes 24, 25 are connected to the shell 15 by brazing, for example.
Is airtightly coupled to. 26 is an oil passage formed in the fitting portion between the motor stator 19 and the shell 15 on the oil sump 27 side, and 28 has one end penetrating the shell 15 and connected to the suction port 11b and the other end having the motor rotor 20 and the shell 15 It is a communication pipe that penetrates through the shell 15 and is connected to the suction space 29 on the side opposite to the compression portion (scroll side) of the suction space formed by. The boss 30a is a splasher in which the boss 30a is fixed to the crankshaft 16 in a portion located between the bearing support 14 and the motor rotor 20 by means such as press fitting, and the lower peripheral edge portion including the edge portion 30b is immersed in the oil in the oil sump 27, 31 Is a sump pocket formed on the outer periphery of the upper portion of the bearing support 14 on the side opposite to the oil sump 27 so as to face the edge 30b of the splasher 30, and 32 is formed on the bearing support 14 through the oil supply hole 33 of the crankshaft 16. An oil hole communicating with the bearing sliding portion 34, and an oil hole 35 formed in the axial direction of the crankshaft 16 and communicating with the bearing sliding portion 34. The oil hole 35 communicates with the bearing sliding portion 37 via the oil supply hole 36 of the crankshaft 16. Reference numeral 38 is a bearing sliding portion that communicates with the oil hole 32.
In the figure, reference numeral 11c is a spiral wrap of the fixed scroll 11, and 12b and 12c are a base plate and a spiral wrap of the orbiting scroll 12.

In the scroll compressor configured as described above,
When the motor is driven, the gas that is the working fluid is sucked into the shell 15 from the suction pipe 25 as shown by the solid arrow in FIG. 8, flows into the suction space 29 through the air gap 21 of the motor, and further the communication pipe 28 is connected. After that, it is taken into the compression chamber 13 from the suction port 11b. Further, the high-pressure gas compressed with the orbiting motion of the orbiting scroll 12 is discharged from the discharge pipe 24 to the outside of the compressor through the discharge port 11a. At this time, the motor stator 19
The motor rotor 20 is cooled by the intake gas.

On the other hand, the oil flows as shown by the broken line arrow in FIG. That is, the rotation of the crankshaft 16 causes the splasher 30 to rotate, so that the oil in the oil sump 27 adheres to the splasher 30 and is pulled up, and is scattered by the centrifugal force, and this oil accumulates in the oil sump pocket 31. And the oil pocket
The oil in 31 flows down in the oil hole 32 due to gravity, and the bearing sliding part
It is supplied to the bearing sliding portions 34 and 37 through the oil supply holes 33 and 36 and the oil hole 35 as well as being supplied to the bearings 18, 38.

The oil that lubricates the bearing sliding portions is discharged to the suction space in the suction port 11b or the shell 15, is carried by the suction gas, and the oil taken into the compression chamber 13 together with the suction gas is the gap of the compression chamber 13. Is used to seal the
It is discharged from the discharge pipe 24 to the outside of the compressor, circulates through the oil separator or each refrigeration / air-conditioning cycle, and returns from the suction pipe 25 into the compressor.

[Problems to be solved by the invention]

By the way, in the conventional horizontal scroll compressor, a method is adopted in which oil splashed by the splasher 30 is collected and refueled. Therefore, it was not possible to sufficiently lubricate each bearing sliding portion. Further, the oil that lubricates the bearing sliding portion 18 of the bearing support 14 flows into the compression chamber 13 and then flows into the cycle outside the compressor due to the suction gas, so the oil in the oil sump 27 decreases. However, there were cases where it became impossible to refuel. As a result, there has been a problem that the sliding parts of the bearings are burned and the reliability in use of the compressor is reduced.

The present invention has been made in view of such circumstances, and is a horizontal scroll compression that can prevent the occurrence of burnout of the sliding portions of the bearings and thus reliably improve the reliability in use of the compressor. Machine.

Further, in the horizontal scroll compressor, it is important to prevent oil from being sucked into the compression chamber together with the gas. Therefore, the present invention has been improved as described below.

[Means for solving the problem]

A cylindrical shell having an oil sump at its bottom and having a central axis extending in the horizontal direction, a fixed scroll provided in the shell and having a gas inlet opening upward, and an axial direction of the fixed scroll. A bearing support provided with an oil discharge chamber that opens downward, a main shaft having an oil supply passage supported by the bearing support and extending in the axial direction, and an oscillating body connected to the main shaft and eccentrically combined with the fixed scroll. In a horizontal scroll compressor including a dynamic scroll and a pump provided in an end portion of the main shaft and having a pipe line facing the oil sump, a horizontal scroll compressor is provided with two notches that open in the vertical direction in the bearing support. When the motor is driven, the gas that is the working fluid is sucked into the suction space above the coil end of the motor stator from the suction pipe, And the inner peripheral surface of the shell to cool the motor, pass through the notch above the bearing support and enter the compression chamber from the gas inlet, while the oil rotates the pump by the rotation of the main shaft. Then, it is supplied to the bearing sliding part through the oil hole of the main shaft, returns to the oil reservoir through the oil discharge chamber, gas passes through the upper notch, and oil passes through the lower notch. Scroll compressor.

(Operation)

In the present invention, the bearing support is provided with two notches that open in the vertical direction, and gas passes through the upper notch and oil passes through the lower notch, so that the gas path and the oil path are surely bisected. The oil is likely to return to the oil sump.

〔Example〕

Hereinafter, the configuration and the like of the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 is a sectional view showing a horizontal scroll compressor according to the present invention, FIGS. 2 and 3 are sectional views showing a pump of the horizontal scroll compressor, and FIG. 4 is a fixed scroll and an orbiting scroll. FIG. 5 is a view showing a combined state, FIG. 5 is a view showing a bearing support, and FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, in which the same members as those in FIGS. 7 and 8 are the same. Reference numerals are given and detailed description is omitted. In the figure, a shell indicated by reference numeral 51 is formed of a cylindrical body having a central axis line extending in the horizontal direction. This shell 51 is provided with an oil sump 52 for accumulating oil for lubricating each bearing sliding member at the bottom and a compression mechanism assembly 53 for compressing the working fluid inside. The compression mechanism assembly 53 includes a fixed scroll 54 and an orbiting scroll 55 that are eccentrically combined with each other, and a motor stator 56 that drives the orbiting scroll 55 of these scrolls.
And a motor rotor 57. The fixed scroll 54 of the compression mechanism assembly 53 has a discharge port 54a, a gas suction port 54b, and a spiral wrap 54c, and is fixed to a bearing support 58. The gas suction port 54b of the fixed scroll 54 communicates with the compression chamber 13 and the shell 51. The opening of this gas suction port 54b is the sump 52
The upper end of the scroll scroll 55 and the end surface of the scroll wrap 54c of the fixed scroll 54, which are located opposite to each other, always face each other with a small gap. And is located on the opposite side in the circumferential direction. (The end of winding of both scrolls 54, 55 is located at a position of 60 to 90 ° in the circumferential direction from the lower end of the scroll.) The bearing support 58 is provided in the axial direction of the fixed scroll 54, and The shell 51
It is fixed to the inner peripheral surface of the by shrink fitting. And
At the outer peripheral edge of the bearing support 58, an oil discharge chamber that opens downward
58a and a recess 58b that constitutes the oil discharge chamber 58a are provided,
And as shown in FIG. 5, a notch 58 that opens in the vertical direction
Mounting portions 58e for fixing the c, 58d and the motor stator 56 with bolts or the like are provided. Of this, the oil discharge chamber 58a
The opening B of the orbiting scroll 54 has an end surface on the spiral wrap side of the base plate 55a of the orbiting scroll 55 and the spiral wrap 54c of the fixed scroll 54.
Has an end face located in the vicinity of a portion which always opposes with a minute gap, and the notch 58c is located in the vicinity of the gas suction port 54b. Reference numeral 59 is a main shaft that connects the orbiting scroll 55, is supported by the bearing support 58 and is provided in the shell 51, and is rotated by a motor A composed of the motor stator 56 and the motor rotor 57. It is configured. The main shaft 59 is provided with the bearing sliding portion 34 and an oil supply passage 59a which is open in the lower end portion and extends in the axial direction, and an oil hole 59b which communicates with the oil supply passage 59a and is opened in the radial direction. . An annular groove 59d that communicates with the oil supply passage 59a through an oil hole 59c is provided on the outer peripheral surface of the main shaft 59. 60 is the oil sump 2
A housing having a tubular body 61 facing the 7 is provided in the axial direction of the orbiting scroll 55 and fixed to a motor stator 56 of the motor A by bolts or the like. The tubular body 61 of the housing 60 communicates with a suction space of a pump, which will be described later, via the first oil hole 60a. An eccentric hole 60b that is eccentric with respect to the axis of the main shaft 59 is provided at the center of the housing 60. Reference numeral 62 denotes a positive displacement pump driven by rotation of the main shaft 59. The positive displacement pump 62 is a trochoid pump having a pump stator 62a and a pump rotor 62b, which are fitted to each other, and is housed inside the housing 60. The pump stator 62a of the pump 62 is rotatably provided in the eccentric hole 60b, and the pump rotor 62b is concentrically fixed to the main shaft 59 by a connecting pin 63. The connecting pin 63 is fixed to the main shaft 59 by press fitting or the like, and a rotation stopping portion is provided by a notch on the outer peripheral surface of the tip end portion on the pump side. Reference numeral 64 denotes a frame for holding the pump 62 in the housing 60, which is fixed to the housing 60 by a bolt 65 and fitted in the pump stator 62a with a minute gap. Further, the frame 64 is provided with an oil hole 64a communicating with the discharge chamber of the pump 62 and the annular groove 59d of the main shaft 59. Reference numeral 66 is a suction pipe for sucking the working fluid into the shell, which is located in the vicinity of the coil end of the motor stator 56 and is mounted on the motor side end plate of the shell 51 by brazing, for example.

In the horizontal scroll compressor configured as described above, when the motor A is driven, the gas as the working fluid is drawn from the suction pipe 66 to the suction space above the coil end of the motor stator 56 as shown by the solid arrow in FIG. Inhaled within 29,
After cooling the motor A through the gap between the outer peripheral surface of the motor stator 56 and the inner peripheral surface of the shell 51, the motor A is passed through the notch 58c above the bearing support 58 and taken into the compression chamber 13 from the gas suction port 54b. Be done. At this time, the suction pipe 66 and the notch 5 of the bearing support 58
8c and the gas inlet 54b of the fixed scroll 54 are sumps 52
Since it is positioned on the upper side far away from, the working fluid flowing into the shell 51 from the suction pipe 66 flows upward.

On the other hand, oil flows as shown by the broken line arrow in FIG. That is, when the pump rotor 62b is rotated by the rotation of the main shaft 59, the pump stator 62a rotates while maintaining a constant eccentric amount with respect to the pump rotor 62b, and a pumping action occurs, so that the oil flows from the pipe body 61 to the first oil. Pump 62 through hole 60a
Into the suction space of the
After passing through the oil hole 64a of the bearing, it is pumped to the oil supply passage 59a through the annular groove 59d and the oil hole 59c, and the bearing sliding portion 18, 34, through the recess 58b of the bearing support 58 and the oil hole 59b of the main shaft 59. Supplied to 37,38. Then, the oil flows out from the bearing sliding portion 18, flows into the oil discharge chamber 58a, and returns to the oil sump 52 from the opening of the oil discharge chamber 58a. At this time, since the end surface of the base plate 55a of the orbiting scroll 55 on the side of the spiral wrap and the end surface of the fixed scroll 54 on the side of the spiral wrap 54c are set to an extremely small gap, almost no oil flows into the compression chamber 13. .

Therefore, in the present invention, it is possible to sufficiently supply each bearing sliding portion with the positive displacement pump 62, and to lubricate the lubricated oil smoothly from the opening of the oil discharge chamber 58a of the bearing support 58 to the oil sump 52. It can be returned.

Further, in the present embodiment, since the path of the suction gas and the path of the oil are divided into two, it is possible to more effectively prevent the oil from flowing into the compression chamber 13 by the suction gas.

In the present embodiment, the case where the pump 62 is a trochoid pump has been shown, but the present invention is not limited to this, and other gear pumps may be used, and the type of the pump may be appropriately changed. Is.

Further, the shapes of the notches 58c, 58d of the bearing support 58 in the present invention are not limited as long as they function as a communication passage between the suction gas and the oil.

〔The invention's effect〕

As described above, according to the present invention, the bearing support is provided with two notches that open in the vertical direction, and when the motor is driven, the gas that is the working fluid flows from the suction pipe to the suction space above the coil end of the motor stator. It is sucked, passes through the gap between the outer peripheral surface of the motor stator and the inner peripheral surface of the shell, cools the motor, passes through the notch above the bearing support, and enters the compression chamber from the gas suction port, while the oil is When the main shaft rotates, the pump rotates, is supplied to the bearing sliding portion through the oil hole of the main shaft, returns to the oil sump through the oil discharge chamber, gas passes through the upper notch, and oil passes through the lower notch. Since it passes, the gas path and the oil path are surely bisected, the oil easily returns to the oil sump, and it is possible to reliably prevent the oil from being sucked into the compression chamber together with the gas.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a horizontal scroll compressor according to the present invention, FIGS. 2 and 3 are sectional views showing a pump of the horizontal scroll compressor, and FIG. 4 is a fixed scroll and an orbiting scroll. FIG. 5 is a view showing a combined state, FIG. 5 is a view showing a bearing support, FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, and FIGS. FIG. 8 is a sectional view showing a conventional scroll compressor. 51 …… shell, 52 …… oil sump, 54 …… fixed scroll,
54b ... gas inlet, 55 ... oscillating scroll, 56 ... motor stator, 57 ... motor roller, 58 ... bearing support,
58a ... Oil discharge chamber, 59 ... Main shaft, 59a ... Oil supply passage, 60 ...
… Housing, 61 …… Tube, 62 …… Pump, 62a …… Pump stator, 62b …… Pump rotor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-60092 (JP, A) JP-A-60-206988 (JP, A) Actually developed JP-A-60-32583 (JP, U)

Claims (1)

(57) [Claims] 1. A cylindrical shell having an oil sump at its bottom and having a central axis extending in the horizontal direction, a fixed scroll provided in the shell and having a gas inlet opening upward, and the fixed scroll. A bearing support that is provided in the axial direction of the scroll and that has an oil discharge chamber that opens downward, a main shaft that is supported by this bearing support and that has an oil supply passage that extends in the axial direction, and a main shaft that is connected to this main shaft and that is fixed to the fixed scroll. In a horizontal scroll compressor, which includes an orbiting scroll that is combined in mind, and a pump in a housing that has a pipe line that is provided at an end of the main shaft and faces the oil sump,
The bearing support is provided with two notches that open in the vertical direction, and when the motor is driven, the gas that is the working fluid is sucked from the suction pipe into the suction space above the coil end of the motor stator, and the outer peripheral surface of the motor stator and the shell. Through the gap on the inner peripheral surface of the motor to cool the motor, pass through the notch above the bearing support, and enter the compression chamber from the gas inlet, while the oil is rotated by the main shaft to rotate the pump and the main shaft. Is passed through the oil hole of the bearing to the sliding portion of the bearing, returns to the oil reservoir via the oil discharge chamber, gas passes through the upper notch, and oil passes through the lower notch. Machine.