JPS597794A - Closed type scroll compressor - Google Patents

Abstract

PURPOSE:To prevent an accident of burning, by providing a gas bleeding mechanism in an oil feed device in the lower part of a shaft so that the performance of a pump is enhanced particularly upon starting operation, for aiming at increasing the amount of oil feed to sliding parts. CONSTITUTION:Eccentric oil feed holes 19, 20 are formed in a crank shaft 8, and the front end of a pipe 13 which is attached to the oil feed hole 19 is submerged in the center part of oil. There is provided such a structure that coolant gas in a pump tip 18 is bled under centrifugal force, and a gas bleed hole 23 is formed in the central part of the crank shaft 8, through which coolant gas produced upon the compressor starting is bled upward. Further, a passage 23A is formed horizontally in the opening part and a gas guide groove 7A is formed in a part of a rotor 7, extending downward, for providing a structure by which the bleed of coolant gas is easily made. Thereby, coolant gas produced in the pump tip 18 is easily bled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a refrigerant compressor for refrigeration equipment and air conditioners.
The present invention relates to a hermetic scroll compressor, and more particularly to a refrigerant gas venting structure for a bearing oil supply device.

The oil supply structure of a conventional hermetic scroll compressor will be explained with reference to FIGS. 1 to 3.

A compressor part is arranged in an upper part and an electric motor part is arranged in a lower part and housed in a closed container 1. The compressor part has a fixed scroll 3 with a thinly wound groove and a flat plate with a bearing boss? :
The electric motor section 2 is formed from an orbiting scroll 4 provided with nine helical protrusions, and the electric motor section 2 is formed from a stator 6 having a stator winding and a rotor 7, which is a rotor. is transmitted to the orbiting scroll 4 via. Due to the orbiting movement of the orbiting scroll 4 accompanying the rotation of the crankshaft 8, the gas flowing in from the suction pipe 9 provided on the outer periphery of the fixed scroll 3 is absorbed by the airtight seal formed between the fixed scroll 3 and the orbiting scroll 4. After being sealed in the space, the sealed space moves toward the center while shrinking and compressing 1/, and the sealed space opens near the center and is compressed into the sealed container 1 through the discharge port 11 provided at the center of the fixed scroll 3. Gas is discharged.

The gas discharged to the upper part of the fixed scroll 3 is discharged to the condenser side through a waste discharge pipe 10 provided at the upper part of the closed container 1.

On the other hand, the crankshaft 8 has a bearing boss 17 provided on the 7-norm 5.
Since the eccentric part 15 is inserted into the bearing part of the orbiting scroll 4, the eccentric oil supply hole 19.2 of the shaft 8 provided for supplying oil to each bearing part
0 are all open to the crankshaft internal space 21, but only the eccentric oil supply hole 19 is opened at the upper end of the crankshaft or is formed from a radial hole through the bearing part between the upper end of the crankshaft and the orbiting scroll bearing boss part. It opens into the upper space 15a of the eccentric part. Further, the flat plate portion of the orbiting scroll is provided with an oil feed hole 16 that opens at one end into the upper space 15a of the eccentric shaft 15 and at the other end at a portion that makes surface contact with the fixed scroll on the outer peripheral side of the orbiting scroll. Since the oil supply hole 22 is provided at the lower end of the shaft, oil flows in and maintains the same oil level as the oil type oil level, but since the lower opening end of the eccentric oil supply hole 19.20 is above the oil level, A crankshaft internal space 21 exists.

Since the crankshaft space 21 is connected to the low pressure 11111 of the compressor section through the oil feed hole 16, the suction pressure decreases after the compressor is started, and accordingly, the residue in the crankshaft internal space 21 is transferred to the suction chamber side. I'm drawn to it. Since the gas in the closed container 1 flows into the space 21 from the eccentric oil supply hole 20, the pressure in the crankshaft internal space 21 no longer decreases, which causes a decrease in the performance of the eccentric oil supply pump.

In particular, when the liquid refrigerant is trapped in the oil, foaming (bubbles) occurs when the pressure in the space 21 decreases.
This caused a shortage in the amount of oil supplied to the bearing, which caused a phenomenon of oil cut-off t''L, resulting in a bearing burnout accident.

Generally, the eccentric oil supply pump at the lower end of the crankshaft 8 is provided with a conical bong tip 18 in order to obtain a centrifugal action effect on the crankshaft 8. Further, it is preferable that the length of the crankshaft 8 is as short as possible. That is crankshaft 8
Since the machining is carried out by supporting both ends, the longer the crankshaft 8 becomes, the more deformation will occur during machining and the machining accuracy will deteriorate. Further, as the crankshaft 8 becomes longer, the material cost increases, so it is generally made as short as possible, and the bong tip 18 is made longer by the length of the crankshaft 8.

The present invention was invented in view of the above, and includes a degassing mechanism in the oil supply device at the bottom of the shaft, which improves the pump performance especially during startup operation, and increases the amount of oil supplied to the sliding parts. The purpose is to prevent burnout accidents.

In order to achieve the above object, the present invention provides a gas vent hole of an appropriate length from the lower end of the crankshaft 4 center, and connects this waste vent hole to a radial gas vent passage at a position higher than the oil level. In the second invention, the discharge port of the compressor and the eccentric oil supply hole are connected by a pipe through the bearing part, and the gas is vented by the ejector effect. It has the feature of performing the following.

An embodiment of the present invention will be described below with reference to FIG.

The shaft 8 has two eccentric oil supply holes 19 and 20. The difference from the conventional pump structure is that a pipe 13 is attached to the oil supply hole 19, and the tip thereof is immersed in oil. This is to prevent the refrigerant scum inside the bong tip 18 from being directly sucked in. A gas vent hole 23 is provided in the center of the crankshaft 8 as a structure for venting the refrigerant gas in the pump chip 18, and is located at a position where there is no centrifugal action. A passage 23A is provided in which the refrigerant gas generated when the compressor is started up is directed upward from the gas vent hole 23, and the opening is in the horizontal direction, and a gas passage groove 7A is formed in a part of the rotor 7 in the direction of the F section.
Refrigerant gas venting structure made easy. With this refrigerant waste removal structure, the refrigerant gas generated within the pump chip 18 can be easily removed, so that the problem of pressure increase due to refrigerant waste in the oil supply holes 19 and 2υ can be solved. Therefore, the performance characteristics of the eccentric oil supply pump are improved, and it is possible to obtain a sufficient amount of oil to the bearing portion.

Next, another embodiment will be explained with reference to FIG.

The method for removing refrigerant gas from the pump chip 18 differs from that in FIG. 4 in the gas opening position.

A refrigerant gas venting passage from the crankshaft 8 passes through the rotor 7 and is vented to a gap between the crankshaft 8 and the stator 3. One advantage of this refrigerant waste removal structure is that when the compressor starts operating and the rotor 7 rotates at high speed, the open opening of the gas removal passage 7B installed in the rotor 7 The pressure decreases due to the ejector effect. Therefore, the action of pulling the refrigerant gas within the pump chip 18 occurs, making it easier for the gas to escape. By removing the refrigerant gas from the pump tip 18, the performance of the bearing oil pump is improved. Problems such as oil shortage in the bearing part 3 can be solved.

FIG. 6 shows yet another embodiment.

When refrigerant scum is latent in the alignment oil supply hole 19 installed in the crankshaft 8, gas pressure is generated and the pressure becomes high.

Therefore, the eccentric oil supply pump action and the oil supply action due to the differential pressure occur particularly when the compressor is started, causing a decrease in the amount of oil supplied to the bearing. The refrigerant gas in the eccentric oil supply hole 19 is removed at the same time as the compressor starts up.
The connection port of the pipe 31 +
18 and connect it. When the compressor starts up, the compressed gas is immediately discharged, so the speed of the discharged gas is used to generate the crankshaft 8 by the ejector effect.
A structure is provided to facilitate gas flow inside the eccentric oil supply hole 19. Especially when liquid refrigerant is trapped in oil, even if forming occurs during startup, gas can be sufficiently vented, so there will be no shortage of oil supplied to the bearings. . Therefore, it is possible to prevent the C1 bearing from burning out.

As explained above, according to the present invention, by providing the oil supply mechanism provided in the crankshaft with a waste removing means, compression vibration can be achieved! During the operation of 11b, the oil in the pump tip generates a foaming phenomenon, and the performance of the lubrication pump is not affected, so normal lubrication is carried out.According to the invention of 42, there is a waste removal means using the ejector effect. By providing this, the gas pressure in the oil supply mechanism is lowered, improving the performance of the oil supply pump, increasing the amount of oil supplied to the bearing, and making it possible to supply a stable amount of oil to the bearing, thereby preventing burnout accidents of the bearing. can be prevented.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional hermetic scroll compressor, Figure 2 is a partially cutaway front view of a conventional crankshaft, and Figure 3 is a longitudinal cross-sectional view of a conventional hermetic scroll compressor.
The figure is a sectional view taken along the line A-A, FIG. 84 is a longitudinal sectional view of the lower end of the crankshaft showing one embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of the F end of the crankshaft 81 showing another embodiment FIG. 6 is a vertical sectional view of a hermetic scroll compressor showing still another embodiment.

Claims (1)

[Claims] 1. A scroll compressor is housed in an airtight container with an electric motor connected to the upper part, a high-pressure atmosphere is created in the airtight container, and an eccentric oil supply hole is provided in the crankshaft. Immerse the pump tip at the lower end of the shaft in oil, make a gas vent hole of an appropriate length from the bottom end on the crankshaft center, and connect this gas vent hole to the radial waste removal passage at a position higher than the oil level. A hermetic scroll compressor characterized by having an opening inside a hermetic container. 2. The hermetic scroll compressor according to claim 1, wherein the gas vent passage opens at the crankshaft at a position below the rotor. 3. The hermetic scroll compressor according to claim 1, wherein the waste removal passage opens through the rotor in a radial direction. 4. A scroll compressor is installed in the upper part and an electric motor is connected to the lower part in a closed container, and a high pressure atmosphere is created in the closed container.
An eccentric oil supply hole is provided in the crankshaft, the bong tip at the lower end of the shaft is submerged in oil, and the discharge port of the compressor and the eccentric oil supply hole are communicated through the bearing part, so that the ejector effect of the discharged gas causes the gas in the oil supply hole to be removed. A hermetic scroll compressor characterized by extraction.