JPS59136598A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce noise generated from a discharging port by a method wherein the difference of fluid resistance generated in a hole having tapered shape is utilized as a discharging valve to feed oil. CONSTITUTION:Discharge oil 26, discharged from the valve element 21 of tapered shape in accordance with the descend of a vane 8, has a force to flow reversely into a substantially enclosed space 24 in accordance with the elevation of the vane 8, however, the fluid resistance is increased since the shape of the end face 21a of the hole at a small diametral part is an edge. As a result, the oil is sent forcibly to the oil supplying path 4a of a crank shaft through the inner wall of an oil flow path 23 while accompanying an amplitude, therefore, the noise, generated out of the discharging port, may be reduced.

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 oil supply structure of the compressor.

[Prior art]

Fig. 1 is a vertical cross-sectional view of a conventionally known horizontal port-to-end residual compressor (hereinafter referred to as the compressor), and here it is shown in the published patent publication No. 57.
Referring to No. 105587, an oil supply pipe 11 with a bent arm is immersed in oil 15 stored below the case 1, and a coil spring 12 that rotates together with the crankshaft 4 is installed inside the oil supply pipe 11. Oil was transferred using coil spring leads. Further, the discharge gas compressed within 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 that, it is discharged into the case 1.

However, this type of compressor has the following drawbacks. In other words, it is a necessary condition for the coil spring 12 to be in contact with the inner wall of the oil supply pipe 11 over the entire circumference and length, or to slide with a small gap, in order to obtain the oil supply ability, and for this reason, compression due to a certain amount of sliding loss is required. It is unavoidable to increase the input power of the machine. 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 was constructed by drawing a thin plate into a cup shape, but the discharge port (Fig. Since the thin plate discharge silencer 1o has low rigidity and small mass, it is often violently vibrated, and the noise vibration is propagated to the outside of the case.

Furthermore, since the plates were thin, their sound insulation performance was insufficient, and a large amount of noise was transmitted through them. Conventionally, as a countermeasure against this problem, measures such as providing a resonance type silencer in a part of the discharge port have been implemented, as seen in Japanese Patent Publication No. 57-46085. When used in a compressor, the top volume of the resonant silencer increases, leading to a decrease in performance, which poses a problem for practical use.

[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.

[Summary of the invention]

In other words, the sub-bearing is provided with an outer peripheral rib, and the thick plate-shaped discharge cover is brought into contact with and locked to the rib to form a sound deadener, and the main bearing end and the sub-bearing end (τIS) are attached to the back of the vane. A sealed space is formed and communicated with a valve element formed by a tapered hole provided in the thick part of the rib, and the pumping action by the reciprocating movement of the back surface of the vane is utilized, and the fluid resistance generated in the tapered hole is reduced. The oil supply mechanism is constructed by using the difference as a discharge valve.

[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 which rotates eccentrically within the cylinder 6, a vane 8 that reciprocates in contact with the roller 7, and a vane 8 on both sides of the cylinder 6. It consists of a main bearing 5 and a sub-bearing 2o which are arranged and rotatably support the crankshaft 4. On the other hand, the vane 8 is arranged to reciprocate up and down in a direction substantially perpendicular to the horizontal surface 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 8
A substantially sealed space 24 filled with oil is formed at the back of the holder. Further, a spring 13 is disposed on the back of the vane 8 to always apply a load in the direction of the roller 7. To explain in detail with reference to FIGS. 2 and 3, the sub bearing 2o
A bearing 1) 7 boss 20C, a discharge port (not shown), a discharge valve (not shown), and a retainer J8 are provided. An outer ring 20a having the same height as the bearing boss 20C is provided on the outer periphery of the sub-bearing 20, and the outer ring 20a at a position covering the substantially sealed space 24 is formed thick, and the valve element 21 is mounted here. This is what was installed. 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 large end 121a of the small diameter part is formed into an edge shape.

Bolt holes are provided in the other plurality of thick portions 20b. A thick plate-like discharge cover 22 having substantially the same shape as the sub-bearing 20 has a hole communicating with the bolt hole, the oil supply path 4a of the crankshaft 4, and the valve element 21.
A hole 22a is provided which communicates with the outer ring 20a, and an oil flow passage 23 is also provided therein, and the hole 22a is abutted and locked to the outer ring 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 ring 20a and covered by the discharge cover 22. The outer circumferential tube 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 a large mass. 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 explained. The up and down reciprocating movement of the five vanes 8 produces a pump action on the oil filling the substantially sealed space at the back of the vanes 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. That is, the discharged oil 26 discharged from the tapered valve element 21 as the vane 8 descends is subjected to a force of flowing back into the substantially sealed space 24 as the vane 8 ascends. Therefore, fluid resistance increases. As a result, the oil is ultimately transferred to the oil supply path 4a of the crankshaft through the inner wall of the oil flow passage 23 described above while being accompanied by vibrations. Further, it is also easy to provide a similar tapered hole 25 in the main bearing 5 to provide the same effect as a suction valve. FIG. 5 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 cln, and the width of the vane is 0.
．． 32c1n, height is 1°25cn+, 30
When operating at a rotation speed of 0.00 rpm, the amount of displacement of the back of the vane is V th = 0.00 rpm. -32X1.25X0.
6×3000=720CC/nin. In addition to this, the measured values are as shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, the sound insulation characteristics of the noise generated from the discharge port of the sub-bearing 20 can be significantly improved, so that a quiet compressor with low operating noise can be provided. In addition, a structure in which the valve element of the oil supply pump is housed in a part of the outer ring of the sub-bearing can be easily realized by forming a sintered metal mold, and the oil flow passage from the valve element to the edge of the crankshaft is also a flat plate-shaped discharge passage. Since they can be formed simultaneously by locking the cover, horizontal compressors can be manufactured with almost no cost savings compared to vertical compressors. Furthermore, there is no need to provide a bent oil supply pipe as shown in FIG. 1, and the entire compressor can be constructed compactly. Therefore, since the present invention can provide an excellent horizontal compressor on the market, the practical vehicle of the present invention has great effects.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a conventionally known horizontal rotary compressor.
Fig. 2 is a vertical sectional view showing an embodiment of the Lochli compression method of the present invention, Fig. 3 is a sectional view taken along the line A-A in Fig. 2, and Fig. 4 is a noise reduction in an embodiment of the present invention. Fig. 5 shows the oil supply capacity.■...Case, 2...Electric element, 3...Compression element, 4...Crankshaft, 4a...Oil supply route, 5
...Main bearing, 6...Cylinder, 7...
Roller, 8... Vane, 9... Sub bearing, 1
0...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 circumference, 20b...Thick wall part, 20C.
...Bearing boss, 21...Valve element, 21a...
Large end face, 22... Discharge force/<-122a... Hole, 2
Discharge...oil flow passage, 24...substantially sealed space, 25...tapered hole, 26...discharge oil. 3rd (Mine 50 fi-Rec of> Zuinson) Tochigi Prefecture, Shimoga-gun, Ohira-cho, Oaza Tomita 800, Hitachi, Ltd. Tochigi Factory Author: Yoshihisa Uneyama Tochigi Factory, Hitachi, Ltd., 800 Oaza Tomita, Ohira-cho, Shimoga-gun, Tochigi Prefecture Inventor: Hiroshi Iwata, 292 Yoshida-cho, Totsuka-ku, Yokohama, Hitachi, Ltd., Home Appliance Research Laboratory; Author: Masahiro Takebayashi, Totsuka-ku, Yokohama 292 Yoshida-cho, Hitachi, Ltd. Home Appliance Research Laboratory

Claims (1)

[Claims] A sub-bearing with a discharge valve and a main bearing are arranged at both ends of the cylinder, and the cylinder has a vane that moves back and forth with one end in contact with a roller that rotates eccentrically inside the cylinder, and the crankshaft is arranged approximately horizontally or inclined. In a rotary compressor, a substantially sealed space is formed at the back of the vane covered by the sub-bearing end and the main bearing end, and an outer ring is provided on the side opposite to the cylinder of the sub-bearing, and a part of the rif is thick. A rotary type, characterized in that a valve element is formed in the body and communicates with the substantially sealed space at the back of the vane, and a flat discharge cover is brought into contact with and locked to the outer circumference of the vane.