JPS59180093A - Enclosed type scroll compressor - Google Patents

Abstract

PURPOSE:To improve the performance of a differential pressure pump, eliminate the delay of oil feeding for a bearing immediately after starting to prevent seizing trouble of the bearing by extracting refrigerant gas staying in a distributor in the differential pressure pump. CONSTITUTION:Four sets of gas extracting holes 20, whose one end can be communicated with the opening of oil feeding hole 14 of a rotating scroll 6 and the other end thereof is communicated with a suction chamber 19, are provided in a fixed scroll 5 with equal spaces. At every one rotation of the rotating scroll 6, the oil supplying hole 14 is communicated with the suction chamber 19 through respective gas extracting holes 20. Accordingly, the refrigerant gas, introduced into the distributing part 15 together with lubricating oil, is introduced into the suction chamber 19 through the gas extracting holes 20. According to this method, the refrigerant gas will never stay in the distributing part 15 and the flow of the lubricating oil to the sliding surface 13 of both scrolls will never be precluded, therefore, the performance of the differential pressure pump may be improved and delay of oil feeding for the bearing immediately after starting may be eliminated thereby enabling to prevent the seizure trouble of the bearing.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a hermetic scroll compressor, and in particular to degassing of refrigerant gas mixed into lubricating oil guided to the sliding surfaces of an orbiting scroll and a fixed scroll. Regarding structure.

[Prior art].

Fig. 1 is a longitudinal sectional view of a conventional hermetic scroll compressor, Figs. 2 and 3 are a plan view and a sectional view of the orbiting scroll in Fig. 1, and Figs. 4 and 5 are plan views of the fixed scroll. and a cross-sectional view. In the figure, a compressor section 2 and an electric motor section consisting of a stator 3, a rotor 4, etc. are housed inside an airtight container 1, with the compressor section 2 facing upward and the electric motor section facing downward. The machine section 2 has a fixed scroll 5 with a spiral wrap 5J of an end plate 5a standing upright, and an orbiting scroll 6 with a spiral wrap 6 upright on the end plate 6a. The lap portions 54 and 64 of both scrolls 5.6 are engaged with each other, and the fixed scroll 5 is connected to the closed container 1.
The orbiting scroll 6 is fixed to the inner wall, and is configured to compress gas by rotating while being prevented from rotating by the rotation of the crankshaft 7. The crankshaft 7
is supported by a main bearing 8 and a swing bearing 9. Also, inside the crankshaft 7, there is an oil supply passage 1 that constitutes a differential pressure oil supply pump.
0 is provided, and a pump tip 11 is provided at the lower end of the oil supply passage 10. This pump tip 11
The lower end of the container is immersed in lubricating oil 12 at the bottom of the closed container 1. On the other hand, inside the orbiting scroll 6, the orbiting scroll 6
A plurality of (four in the figure) oil supply holes 14 are provided that extend in the radial direction of the fixed scroll 5 and the orbiting scroll 6 and open on the sliding surfaces 13 of the orbiting scroll 6. It communicates with the oil supply passage 10 via a portion 15.

Next, the operation of the hermetic scroll compressor described above will be explained. When the compressor is operated, suction gas is drawn into the compressor section 2 from the suction pipe 16 of the closed container 1, compressed by the compressor section 2, and then discharged from the discharge pipe 17 to the outside of the machine. On the other hand, due to the rotation of the crankshaft 7, lubricating oil 12 is sucked up into the oil supply passage 10 through the pump tip 11, and the lubricating oil 12 is sucked up to the main bearing 8.
and sent to the swing bearing 9. Further, the lubricating oil is sent through the oil supply hole 14 to the sliding surface 13 of the fixed scroll 5 and the orbiting scroll 6, and then discharged from the core sliding surface 13 to the suction chamber on the low-use side of the compressor section 2. It is compressed together with the refrigerant gas and discharged from the discharge pipe 17 to the outside of the machine.

By the way, refrigerant gas 18 exists above the surface of the lubricating oil 120 in the pump chip 11, and the refrigerant gas 18 is sucked up into the oil supply passage 10 together with the lubricating oil 12 and flows to the bearing section. It stays in the distributor section 15 at the upper end of the crankshaft 7. The lubricating oil flows to the oil supply hole 14 due to the centrifugal force caused by the orbiting motion of the orbiting scroll 6, but the refrigerant gas flows to the oil supply hole 14 due to centrifugal force.
This is because it does not flow to 4.

However, in the conventional hermetic scroll compressor, the refrigerant gas, -4-, -3-, is present in the distribution section 15.

There is a problem in that the flow of lubricating oil to the oil supply hole 14 is obstructed by the retention of lubricating oil, resulting in a decrease in the performance of the differential pressure oil supply pump. Deterioration in the performance of a broken differential pressure lubrication pump causes a delay in lubrication to the bearings, especially immediately after startup, which has long been a habit of leading to bearing burnout accidents.

[Purpose of the invention]

The purpose of the present invention is to provide a differential pressure oil pump for distributing,
- To provide a hermetic scroll compressor which can improve the performance of a differential pressure oil supply pump by venting refrigerant gas stagnant in a gating part, and can prevent bearing burnout immediately after startup.

[Summary of the invention]

In order to achieve this object, the hermetic scroll compressor of the present invention has a fixed scroll that has a fixed scroll that has one end that can communicate with the opening of the oil supply hole of the orbiting scroll, and the other end that can communicate with the suction chamber of the compressor section. A plurality of vent passages are provided, and when the gas vent passage and the opening of the oil supply hole are communicated with each other due to the orbiting movement of the orbiting scroll, the refrigerant gas staying in the distribution section is discharged through the gas vent passage due to the differential pressure. It is characterized by what it did.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 6 and 7. FIG. 6 is a plan view of the fixed scroll in the hermetic scroll compressor of the present invention, and FIG. 7 is a sectional view thereof, and the same reference numerals as in FIGS. 4 and 5 represent the same parts. In the hermetic scroll compressor of the present invention, the fixed scroll 5 has four degassing holes 20 at equal intervals, one end of which communicates with the opening of the oil supply hole of the orbiting scroll, and the other end of which communicates with the suction chamber 19. It is a provision.

However, in the hermetic scroll compressor of the present invention,
Every time the orbiting scroll makes one revolution, the opening of the oil supply hole in the orbiting scroll is communicated with the suction chamber 19 via each gas vent hole 20, so that the oil supply passage 1 shown in FIG.
Due to the differential pressure between 0 and the suction chamber 19, the distribution part 1
The refrigerant gas introduced into the suction chamber 19 together with the lubricating oil is introduced into the suction chamber 19 through the gas vent hole 20 .

Therefore, unlike in the prior art, refrigerant gas does not remain in the distribution section 15, and the flow of lubricating oil to the sliding surfaces of the fixed scroll 5 and the orbiting scroll is not obstructed, so differential pressure lubrication is possible. Improves pump performance. Furthermore, due to the improved performance of the differential pressure oil supply pump, there is no delay in oil supply to the bearings immediately after startup, so there is no risk of bearing burnout.

8 and 9 are a plan view and a sectional view of a fixed scroll shown as another embodiment of the present invention, and FIGS.
The difference from the illustrated embodiment is that, instead of the gas vent holes, gas vent grooves 21 are provided on the sliding surface of the fixed scroll 5 with respect to the orbiting scroll.

In this embodiment as well, degassing can be performed in the same manner as in the previously described embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to completely eliminate the degassing of refrigerant gas that remains in the distribution section of a differential pressure refueling pump, and it is possible to eliminate the delay in refueling the bearing immediately after startup, thereby causing damage to the bearing. Accidents can be prevented.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing a conventional hermetic scroll compressor, Figs. 2 and 3 are a plan view and a sectional view of the orbiting scroll in Fig. 1, and Figs. 4 and 5 are similar to that of a fixed scroll. Plan and sectional views, Figures 6 and 7
The figures are a plan view and a sectional view of a fixed scroll shown as one embodiment of the invention, and FIGS. 8 and 9 are a plan view and a sectional view of a fixed scroll shown as another embodiment of the invention. 1... Airtight container 2... Compressor section 3... Stator 4... Rotor 5... Fixed scroll 5a.
...End plate part 5k...Wrap part 6...Orbiting scroll 6a...End plate part 64...Wrap part 7...
Crankshaft 10...Oil supply passage 12...Lubricating oil
13...Sliding surface between fixed scroll and orbiting scroll 14...Oil supply hole 15...Distribute section
19... Suction chamber 20... Gas vent hole 21...
Gas vent groove \-nofu 5" leap 21

Claims (1)

[Claims] A fixed scroll with a spiral wrap standing upright on the end plate and an orbiting scroll are engaged with each other with the wraps of both scrolls inside each other, and the orbiting scroll is rotated without rotating on its own axis to compress gas. A compressor section and an electric motor section connected to a crankshaft protruding downward from the compressor section are housed in a closed container maintained in a high-pressure atmosphere, and the crankshaft is supplied with oil constituting a differential pressure oil supply pump. a closed scroll compressor, wherein the orbiting scroll is provided with a plurality of oil supply holes that communicate with the oil supply passage, extend in the radial direction of the orbiting scroll, and open at the sliding surfaces of the fixed scroll and the orbiting scroll; A hermetic scroll compressor, characterized in that a fixed scroll is provided with a plurality of degassing passages, one end of which communicates with the opening of the oil supply hole, and the other end of which communicates with the suction chamber of the compressor section. .