JPS6397894A - Tightly closed scroll compressor - Google Patents

Abstract

PURPOSE:To reduce an oil rising amount by extending the gas inflow port side of a discharge pipe to the neighborhood of the rotor upper end of a motor part and turning the gas inflow port in the same direction as the rotor rotation direction so as to promote oil separation action in a tightly closed container. CONSTITUTION:An upper chamber 1a in a tightly closed container 1 where a discharge port 7 is opened is communicated with an upper motor chamber 1b through passage 14a and 14b. This upper motor chamber 1b is communicated with a lower motor chamber 1c through a passage 15 between a stator 3b and the side wall of the tightly closed container 1. At a position opposite to the passages 14a and 14b of the upper motor chamber 1b, a discharge pipe 16 which pierces the tightly closed container 1 is provided, and its gas inflow port 16a side is extended to the neighborhood the upper end of a rotor 3a and the gas inflow port 16a is turned in the same direction as the rotation direction of the rotor 3a. By this, separated oil does not flow into the discharge pipe 16, oil separation action is promoted and oil rising amount can be reduced.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a hermetic scroll compressor used as a refrigerant compressor for refrigeration or restriction or a helium compressor, and particularly relates to Regarding separation.

(Prior art) A conventional hermetic scroll compressor is disclosed in Japanese Patent Application Laid-Open No. 58-188.
88'l, the refrigerant gas compressed in the scroll compressor section once passes through the outer circumference of the stator of the electric motor,
Next, the oil is separated at the lower part of the chamber, and then the refrigerant gas rises again through the outer periphery of the stator of the motor to reach the upper space of the motor chamber, thereby separating the oil contained in the refrigerant gas.

That is, oil separation is performed by changing the flow direction of refrigerant gas within the motor chamber.

[Problem that the invention seeks to solve]

The above conventional technology separates oil by simply changing the gas flow direction in the motor chamber, so there is a limit to the oil separation efficiency, and the amount of oil flowing out from the discharge pipe increases by 110%. ) There is a problem that t increases. In particular, when the scroll compressor is driven by an inverter,
The amount of oil coming up increases significantly. When the amount of oil coming out of the compressor increases 7J11, not only the reliability of the compressor itself but also the performance and reliability of the refrigeration cycle as a whole (for example, the heat transfer performance of the heat exchanger and the pressure loss of the piping increase) decreases. There is a risk that it may cause

An object of the present invention is to provide a hermetic scroll compressor that can promote oil separation within a hermetic container and reduce the amount of oil coming up.

[Means for solving problems]

The above purpose is to house a scroll compressor section and an electric motor section in a sealed container in series via a rotating shaft supported by a frame, divide the inside of the sealed container into upper and lower chambers by the frame, and place the An oil reservoir is formed, this oil is supplied to each sliding part, and gas is inhaled from the suction port, centering between the compression 9 formed by the orbiting scroll member and the fixed scroll member I.]
The compressed gas is moved to reduce the volume and compress the gas, and the compressed gas is discharged from the discharge port into the upper chamber and guided to the lower chamber through the passage.
In a hermetic scroll compressor that discharges to the outside from a discharge pipe located on the opposite side of the passage, the gas inlet side of the discharge pipe is extended to near the upper end of the rotor of the motor section, and the gas inlet is connected to the rotor rotation side. This is achieved by configuring it to face in the same direction f.

(Operation) When the gas compressed in the scroll compressor section flows into the lower chamber (motor chamber) through the passage, the oil contained in the gas adheres to the upper part of the rotor of the electric motor section.The rotor The oil adhering to the upper part of the rotor is scattered in the radial direction by the centrifugal force of the rotor, and when it reaches the outer periphery of the upper end of the rotor, it is scattered in the tangential direction of the outer periphery of the rotor. Because it is located near the top end and faces the rotation direction of the rotor, it prevents the oil that has splashed in the tangential direction of the rotor from being entrained (inflow). After reaching the coil end side, it falls downward.In this way, the centrifugal force generated by the rotation of the rotor of the electric motor can be used to promote oil separation and prevent the separated oil from flowing into the discharge pipe. , the amount of oil coming up is reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a hermetic scroll compressor according to the present invention, and FIG. 2 is a sectional view taken along the line 1--2 in FIG.

In the figure, a scroll compressor section 2 is housed in an upper part of a closed container 1, and an electric motor part 3 is housed in a lower part. The inside of the closed container 1 is divided into an upper chamber 1a and an electric machine room.

The scroll compressor section 2 includes a fixed scroll member 4 and an orbiting scroll member 5 that are engaged with each other to form a compression chamber (sealed space) 6. The fixed scroll member 4d consists of a disk-shaped end plate 4a and a wrap 4b standing upright thereon and formed into an involute curve or a curve approximating it, with a discharge lower at the center and an inlet 8 at the outer periphery. It is growing. The orbiting scroll member 6 includes a disc-shaped end plate 5a, a wrap 5b which stands upright and is formed in the same shape as the wrap of the fixed scroll, and a boss 5 formed on the opposite wrap surface of the end plate.
It consists of C. The frame 9 has a bearing part formed in the center thereof, and this bearing part E supports the rotating shaft 10, and an eccentric shaft 10ad at the tip of the rotating shaft is inserted into the boss 5C so as to be able to rotate. Further, the fixed scroll member 4 is fixed to the frame 91C by a plurality of bolts, and the orbiting scroll member 5 is supported on the frame 9 by an Oldham mechanism 11 consisting of an Oldham ring and an Oldham key, so that it rotates without rotating relative to the fixed scroll member 4. It's more like doing it. A motor shaft 12 that is tightly fitted to the rotor 8 of the motor section 8 is integrally connected to the lower part of the rotating shaft 100. A suction pipe 18 penetrating the closed container 1 is connected to the suction port 8 of the fixed scroll member 4, and the upper chamber 1a in which the discharge lower is open communicates with the upper electric motor glb via a passage 11.14t). . The upper motor chamber 1b communicates with the lower motor chamber IC via a passage 15 between the stator 8b of the motor section 8 and the side wall of the sealed container 1. The upper motor chamber 1b communicates with a discharge pipe 16 passing through the closed container 1 at a position f opposite to the passages 14a and 14b.

The gas inlet side of the spinning discharge pipe 16 is connected to the rotor 8 of the electric motor section 8.
The gas inlet port 16 at'' is extended to near the upper end of a.
It is directed in the same direction as the direction of rotational force of the rotor 8 (the direction of the arrow).

In addition, 17 is a frame pedestal part for fixing the electric motor part 8 to the frame 9 side, 18 is a terminal part, 19 is an oil reservoir formed at the bottom of the closed container l, and 20 is attached to the motor shaft 12. This oil supply pump 20 sucks up the oil in the oil reservoir 19 and passes it through the oil supply passage 21 to each sliding part (
(slewing bearing, main bearing, etc.). Further, solid line arrows in FIG. 1 indicate the flow direction of gas, and dashed line arrows indicate the flow direction of oil.

Next, the operation of this embodiment will be explained.

When the electric motor section 8 is driven, the orbiting scroll 5 of the scroll compressor section 2 rotates to compress the gas sucked in through the suction pipe 18 in the compression chamber 6 and discharge it from the discharge lower to the upper chamber l&. The compressed gas discharged into the upper chamber 1a is passed through the passage 14! L
. The gas is scattered in the radial direction by the centrifugal force caused by the rotation of the rotor, and when it reaches the outer circumference of the upper end of the rotor, it is scattered in the connection direction of the outer circumference of the rotor. Since it is located in the direction of rotation of the rotor 8a (direction of arrow A), it prevents the oil scattered in the tangential direction of the rotor from being caught in (inflow).The oil scattered in the tangential direction of the rotor is After reaching the coil end 8C side I of the stator 3b due to the force, it falls to the lower motor chamber IC and collects in the oil sump 19.

As described above, in this embodiment, the centrifugal force generated by the rotation of the rotor 8a of the electric motor section 8 is used to promote the oil separation action, and the flow of the separated oil into the discharge pipe 16 can be prevented. In addition, in the present invention, as shown in FIGS. 8 and 4, +c
The height of the coil end 8C of the stator 3b of the t-movement m section 8,
If the height of the upper end of the rotor 8a is the same as that of the rotor 8a, the gas inlet 16a' side of the discharge pipe 16 is bent into a bent shape to form a straight pipe in the same direction as the tangential force direction of the outer circumference of the rotor. 1
61) so that the gas inlet 16a faces in the same direction as the rotor rotation direction.

(Effects of the Invention) According to the present invention, the oil separation effect within the closed container can be promoted and the amount of oil coming up can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the hermetic scroll compressor of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ of FIG. 1, and FIG. Fig. 4 is a cross-sectional view taken along ■-■ of Fig. 8. 1... Airtight container 1a...
- Upper chamber 1b... Upper motor room IC... Lower motor room 2... Scroll compressor section 8... Electric motor section 8a... Rotor 8b... Stator Be...
・Coil end 4...Fixed scroll 5...Orbiting scroll 6...Compression chamber 7...Discharge port 9...
Frame 10...Rotating shaft 14a, 14b...-
Passage 16...Discharge pipe 16a...Gas inlet 1
6b... Straight pipe section 19... Oil sump. Agent: Patent Attorney Masaru Ogawa Male Referee Z Group 40th IO Puhe

Claims (1)

[Claims] 1 A scroll compressor section and an electric motor section are housed in a closed container, connected to each other via a rotating shaft supported on a frame, and the inside of the closed container is divided into upper and lower chambers by the frame, and an oil reservoir is provided at the bottom of the lower chamber. This oil is supplied to each sliding part, and the gas is sucked in from the suction port and moved around the compression space formed by the orbiting scroll member and fixed scroll member to reduce the volume and compress the gas. In a hermetic scroll compressor in which compressed gas is discharged from a discharge port into an upper chamber, guided to a lower chamber via a passage, and discharged outside from a discharge pipe located on the opposite side of the passage, the discharge pipe is What is claimed is: 1. A hermetic scroll compressor, characterized in that the gas inlet side of the compressor extends to near the upper end of the rotor of the electric motor section, and the gas inlet is oriented in the same direction as the rotational direction of the rotor.