JPH0512556B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotary type compressor used in refrigerators, air conditioners, etc. This relates to the aircraft's refueling structure.

[Prior art]

FIG. 1 is a vertical cross-sectional view of a conventionally known horizontal rotary compressor (hereinafter referred to as the compressor). Here, referring to Japanese Patent Publication No. 57-105587, the oil supply pipe 11 with a bent arm is connected to the case. A coil spring 1 is immersed in oil 15 stored below 1 and rotates together with the crankshaft 4 in an oil supply pipe 11.
2 was installed inside, and the oil was transferred by a coil spring lead. Further, the discharge gas compressed in the cylinder 6 is discharged from a discharge valve (not shown) provided on the sub-bearing 9 into a silencing chamber 16 covered with a cup-shaped discharge silencer 10 formed by drawing a thin plate. After, case 1
It is discharged inward.

This type of compressor had the following drawbacks. That is, the coil spring 12 is connected to the oil supply pipe 1
It is a necessary condition to obtain oil supply capacity that the compressor contacts or slides with a minute gap over the entire circumference and length of the inner wall of No. 1, and therefore, a certain amount of increase in compressor input due to sliding loss is unavoidable. . Furthermore, compared to a vertical compressor, the number of parts increases, making the compressor cost relatively high.

In addition, regardless of whether the compressor is horizontal or vertical, the silencing chamber 16 is constructed by drawing a thin plate into a cup shape, but the discharged gas is emitted from the discharge port (not shown) with considerable impact noise. ), the thin plate discharge silencer 10 has low rigidity and small mass, and therefore is often violently vibrated, and the noise vibration is propagated to the outside of the case.

Also, since it is a thin plate, its sound insulation performance is insufficient.
The noise transmitted was also large. Conventionally, as a countermeasure to this problem, as seen in the published patent publication No. 57-46085,
Measures such as installing a resonant silencer in a part of the discharge port have been implemented, but when used in low-temperature compressors with particularly high compression ratios, the volume of the resonant silencer increases the top volume, resulting in a decrease in performance. There was a problem with practical implementation because of the

[Purpose of the invention]

The purpose of the present invention is to realize a new oil supply mechanism and to provide the market with an inexpensive and highly reliable horizontal compressor that can operate quietly.

[Structure of the invention]

In order to achieve such an object, the present invention includes: a crankshaft arranged substantially horizontally and driven by an electric motor; a roller that rotates eccentrically with an eccentric portion of the crankshaft therein; and a cylinder housing the roller. The cylinder is provided on the motor side and the counter-motor side to support the crankshaft, and the counter-motor side is provided with a bearing having continuous ribs around its entire outer circumference, and a bearing that is in contact with the entire circumference of the rib of the bearing. a flat discharge cover that forms a silencing chamber for the discharged gas; a vane that reciprocates with one end in contact with the roller and supplies oil with the other end; The anti-electric motor includes a cover member that is combined with the discharge cover to form an oil flow passage leading to the formed oil supply route, and a case that houses each of the above members and from which the refrigerant that has passed through the silencing chamber is discharged, The rib on the side bearing has a partially thickened wall, and this thickened portion has a valve element consisting of a hole with a smaller diameter on the side opposite to the cylinder for discharging oil due to the oil supply action of the vane, and the discharge cover has holes facing the valve element and the oil supply path, and the cover member covers each hole of the discharge cover to provide electrical continuity between the holes to form the oil flow path. It is used as a compressor.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. An electric element 2 and a compression element 3 are housed in a case 1, and oil 15 is stored in the lower part. The compression element 3 includes a cylinder 6, a crankshaft 4 driven by the electric element 2, a roller 7 driven by the crankshaft 4, and a roller 7 that rotates eccentrically within the cylinder 6.
A main bearing 5 and a sub-bearing 2 are arranged on both sides of the vane 8 and the cylinder 6, which reciprocate in contact with the crankshaft 4, and rotatably support the crankshaft 4.
It consists of 0. On the other hand, the vane 8 is arranged to reciprocate up and down in a direction substantially perpendicular to the horizontal plane of the oil 15, and the end of the main bearing 5 and the end of the sub-bearing 20 are immersed in the oil 15, and the vane A substantially sealed space 24 filled with oil is formed at the back of the housing 8. Further, a spring 13 is disposed on the back of the vane 8 to always bias the load toward the roller 7. To explain in detail with reference to FIGS. 2 and 3, the sub-bearing 20 is provided with a bearing boss 20c, a discharge port (not shown), a discharge valve (not shown), and a retainer 18. An outer circumferential rib 20a having the same height as the bearing boss 20c is provided on the outer circumference of the sub-bearing 20, and the outer circumferential rib 20a at a position covering the substantially sealed space 24 is formed thick, and the valve element 21 is arranged here. This is what I did. The valve element consists of a tapered or trumpet-shaped hole consisting of a large diameter part that opens into the substantially sealed space 24 and a small diameter part that opens on the side opposite to the cylinder, and the hole end surface 21a of the small diameter part is formed into an edge shape.

Bolt holes are provided in the other plurality of thick portions 20b. Further, the discharge cover 22, which is thick and has substantially the same shape as the sub-bearing 20, has a hole 22b communicating with the bolt hole, a hole 22b communicating with the oil supply path 4a of the crankshaft 4, and a hole communicating with the valve element 21. 22a is disposed, and an oil flow passage 23 is provided in which a cover member having a recess for forming a passage that communicates between the two holes is fixed to the discharge cover 22.
It abuts and is locked to the outer circumferential rib 20a. In one embodiment of the compressor of the present invention configured in this manner, the operation and function will be explained below. High pressure gas compressed by the rotation of the roller 7 is emitted from the discharge port of the sub-bearing 20 with considerable impact noise. Discharged intermittently. The noise generated at this time is radiated to the silencing chamber 16 surrounded by the outer peripheral rib 20a and covered by the discharge cover 22. The outer circumferential rib 20a and the discharge cover 22 can be easily thickened compared to a conventional cup-shaped discharge silencer formed by a throttle, so they have high rigidity and large mass, and are less susceptible to the above-mentioned impact noise. It is less susceptible to vibration, and can significantly improve sound insulation performance.

FIG. 4 confirms the above-mentioned effect of adopting this structure in a compressor, and the noise is reduced over a wide frequency band indicated by diagonal lines in the figure. Note that this effect can be achieved regardless of whether the compressor is vertical or horizontal. Next, the oil supply mechanism will be described. The reciprocating movement of the vane 8 up and down causes a pumping action to act on the oil filling the substantially sealed space at the back of the vane 8. Here, as shown in FIG. 2, a valve element 21 provided on the sub-bearing 20 acts as a discharge valve and exhibits an oil supply pump function. In other words, the discharge oil 26 discharged from the tapered valve element 21 as the vane 8 descends.
As the vane 8 rises, a backflow force acts on the substantially sealed space 24, but since the small diameter hole end surface 21a has an edge shape, fluid resistance increases. For this reason, the oil eventually passes through the inner wall of the oil flow passage 23 and reaches the oil supply path 4 of the crankshaft with vibration.
It is sent under pressure to a. Further, it is also easy to provide a similar tapered hole 25 in the main bearing 5 so that it can function as a suction valve. Fifth
The figure shows the amount of oil supplied to the oil supply path 4a of the crankshaft 4 in a compressor having the above-described structure according to an embodiment of the present invention. In this case, the round trip distance of the vane is approximately 0.6 cm, the width of the vane is 0.32 cm, and the height is
When a 1.25cm one is operated at a rotation speed of 3000 rpm, the displacement amount of the back of the vane is Vth = 0.32 × 1.25
×0.6×3000=720 c.c./min. In contrast,
The actual measured values are as shown in FIG.

When the compressor stops, the oil supply stops, but
At the time of restart, the oil in the oil sump space 27 is supplied to the shaft 4 before the oil is supplied by the pumping action of the reciprocating vanes, thereby eliminating the unlubricated state immediately after the restart,
Smooth rotation is guaranteed.

〔Effect of the invention〕

As described above, according to the present invention, since the valve element is formed of a hole whose diameter is reduced on the side opposite to the cylinder in the partially thickened portion of the rib, a separate valve element is incorporated. It goes without saying that no work is required, and that variations in performance due to assembly variations are eliminated.

Each hole of the discharge cover facing the oil supply path formed in the valve element and the crankshaft and the space between these holes are covered with a cover member to provide electrical continuity between the holes to form an oil flow path. , the silencing chamber and the oil flow path are separated so that only lubricating oil can be supplied to the oil supply path in the crankshaft.

The cover member is combined with the flat discharge cover to form an oil flow passage, and the thick part of the rib has a valve element, so the discharge cover can be brought into contact with the entire circumference of the rib of the bearing. Therefore, the valve element and the oil supply path in the crankshaft can be electrically connected to each other at the same time as the silencing chamber is formed. Therefore, workability and assemblage are better than installing a bent oil supply pipe, and the compressor as a whole can be made more compact.

Furthermore, since the bearing has continuous ribs all around the outer circumference, and a flat discharge cover is in contact with the entire circumference of the ribs to form a muffling chamber, no discharge sound leaks. Furthermore, since the cover member constituting the oil flow passage is provided on a flat discharge cover that can be made thicker, the effect is essentially the same as that of a thicker cover member, resulting in vibrations. It is difficult to do so, and it also improves sound insulation performance.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventionally known horizontal rotary compressor, FIG. 2 is a longitudinal sectional view showing an embodiment of the rotary compressor of the present invention, and FIG. 3 is a sectional view taken along line A-A in FIG. 2. 4 shows the noise reduction effect in one embodiment of the present invention, and FIG. 5 shows the refueling capacity. 1... Case, 2... Electric element, 3... Compression element, 4... Crankshaft, 4a... Oil supply path, 5... Main bearing, 6... Cylinder,
7...Roller, 8...Vane, 9...Sub bearing, 10...Discharge silencer, 11...Oil supply pipe, 12...Coil spring, 13...Spring, 14...Bolt, 15...Oil, 16 …
...silence chamber, 18...retainer, 20...sub-bearing of the present invention, 20a...outer circumferential rib, 20b...
...Thick wall part, 20c...Bearing boss, 21...
Valve element, 21a... hole end surface, 22... discharge cover, 22a... hole, 23... oil flow passage, 24...
Almost sealed space, 25...Tapered hole, 26...Discharge oil, 27...Oil sump space.

Claims (1)

[Scope of Claims] 1. A crankshaft arranged substantially horizontally and driven by an electric motor, a roller that rotates eccentrically within which an eccentric portion of the crankshaft is located, a cylinder that accommodates the roller, and an electric motor for the cylinder. The side opposite to the electric motor is provided with a bearing that supports the crankshaft, and the one on the opposite side of the electric motor has a continuous rib around the entire outer circumference of the bearing. A flat discharge cover that forms a silencing chamber; a vane that reciprocates with one end in contact with the roller and supplies oil with the other end; and a vane that reciprocates with the roller at one end and supplies oil with the other end; A cover member that is combined with the discharge cover to form an oil flow passage leading to the oil flow path, and a case that houses each of the above members and discharges the refrigerant that has passed through the silencing chamber, and the bearing on the side opposite to the motor is The wall of the rib is partially thickened, and the thick wall portion has a valve element consisting of a hole with a smaller diameter on the side opposite to the cylinder through which oil is discharged by the oil supply action of the vane, and the discharge cover is provided with the valve element. and a hole facing the oil supply path, and the cover member covers each hole of the discharge cover to provide electrical continuity between the holes to form the oil flow path. Rotary compressor.