JPS6358275B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a horizontal rolling piston compressor, and particularly to improving discharge muffler characteristics.

[Conventional technology]

FIG. 1 is a sectional view showing a conventional rolling piston compressor disclosed in, for example, Japanese Utility Model Application No. 56-109472. In the figure, 1 is a closed container, and 2 is driven by a drive source (not shown). It is rotatably supported in the horizontal direction by an eccentric shaft. 3 is a cylinder that is concentric with this eccentric shaft and forms a compression chamber 4; 5 is a rolling piston that rolls along the inner wall of this cylinder; and 6 is a cylinder that reciprocates in contact with the outer circumference of this rolling piston to open the compression chamber 4. High pressure chamber 4a and low pressure chamber 4
The vanes partitioned into b slide vertically in the vane groove formed in the cylinder 3. 7 is a spring that presses this vane toward the rolling piston 5 side, 8 is a spring hole that accommodates this spring, 9 is a discharge valve that opens and closes the high pressure chamber 4a and the outside of the cylinder 3, and 10 is provided on the discharge side. The discharge muffler 11 is a cavity formed by the inner wall surface of the closed container 1 and the outer wall surface of the cylinder 3.

A conventional rolling piston type compressor having a discharge muffler is constructed as described above, and when the eccentric shaft 2 is driven in the direction of arrow A in the figure, the rolling piston 5 rolls along the inner wall of the cylinder 3.
The compressed gas in the high pressure chamber 4a opens the discharge valve 9, flows out, and is guided to the discharge muffler 10. The guided gas is guided to the cavity 11 with noise and pressure pulsations reduced by the expansion part 10a and side branch part 10b of the discharge muffler 10,
It is discharged to the outside of the compressor from the closed container outlet (not shown).

[Problem to be solved by the invention]

The above-mentioned discharge muffler has the disadvantage that it has to be housed in a limited space with a special shape such as a cavity, so the shape is inevitably complicated, leading to increased cost and weight.

In addition, because the velocity of the discharged gas is quite high, the effect of reducing noise and pressure pulsation due to the expansion part of the discharge muffler is considerably worse than when there is no flow, and the side branch part is also located at a position that is not easily affected by the flow velocity. However, because the original characteristics have the drawback that the reduction effect can only be obtained in a narrow frequency band, it has not been possible to obtain the reduction effect as expected.

The purpose of this invention is to eliminate the above-mentioned drawbacks.It does not require any special parts for the discharge muffler, and moreover, it has a greater effect in reducing noise and pressure pulsation than conventional discharge mufflers. A rolling piston compressor with a discharge muffler is provided.

[Means to solve the problem]

A rolling piston compressor according to the present invention includes a spring that presses a vane that reciprocates in a vane groove formed in a cylinder in contact with the outer circumference of a rolling piston, and a cylindrical shape that houses this spring and has a diameter larger than the thickness of the vane. A spring hole is formed, and its lower end is opened into the lubricating oil stored in the inner bottom of the sealed container, and the upper part of one side of the spring hole communicates with the high pressure chamber through a discharge passage, and the lower end of the spring hole in the counter-discharge passage is connected to the high pressure chamber. An outlet is formed, and the inside of the spring hole is used as a discharge muffler.

[Effect]

The rolling piston compressor of the present invention is inexpensive and has the effect of reducing noise and pressure pulsation by configuring a discharge muffler having an expansion part and a side branch part surrounded by vanes, spring holes, and a closed container. .

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings. In FIG. 2, the same reference numerals shown in FIG. 1 indicate the same or corresponding parts.

1 is a closed container storing lubricating oil at the inner bottom; 6 is a vane that contacts the outer periphery of the rolling piston 5 and reciprocates upward in a vane groove formed in the cylinder 5; (8) is a substantially cylindrical shape; , a spring hole having a diameter larger than the thickness of the vane, whose lower end opening faces the closed container 1 and is located in the lubricating oil stored in the inner bottom of the container.

12 is a discharge passage that guides the gas flowing out from the high pressure chamber 4a to the upper side of the spring hole 8, and 13 is a spring hole outlet through which the gas flows out from the spring hole provided in the counter-discharge passage to the cavity 11. A spring hole 8 close to the inner wall opens downward.

Reference numerals 8a and 8b are an expansion part and a side branch part, respectively, which are formed by a cavity surrounded by the vane 6, the spring hole 8, and the closed container 1.

The rolling piston type compressor according to the present invention is constructed as described above, and by appropriately selecting the inner diameter and depth of the spring hole 8, a discharge muffler having an expansion part 8a and a side branch part 8b is constructed. Note that the volume of the expansion part does not need to be very large when considering the reduction of high frequencies of 1 KHz or more, and the space behind the vane as in the above embodiment is sufficient.

Furthermore, the position of the vane 6 shown by the solid line in FIG.
If the position is the closed position of the discharge valve 9, the lengths of the expansion part 8a and the side branch part 8b of the spring hole change from the solid line position to the broken line position when a muffler effect is required, thereby reducing noise and pressure. The pulsation reduction frequency band becomes wider, and the overall reduction effect of the muffler can be considerably improved compared to the conventional one.

In this case, since the vane movement speed is sufficiently small compared to the speed of sound, the movement of the vane 6 has almost no adverse effect on the reduction effect of the muffler. Also,
Almost no lubricating oil in the closed container 1 is present in the spring hole 8 during operation of the compressor, so that bubble noise caused by bursting of air bubbles in the lubricating oil does not occur.

Generally, in a rolling piston compressor, a resistor may be provided at the outlet of the discharged gas to the cavity 11 to separate lubricating oil mixed in the discharged gas.

When the outflow position of the discharged gas is somewhat special as in this invention, it is necessary to devise a method for installing the resistor.

FIG. 4 shows an embodiment in which the rolling piston compressor of the present invention is provided with a resistor for oil separation.

In the figure, reference numeral 14 denotes a shielding plate of a predetermined height installed at the inner bottom of the sealed container 1 at a distance from the spring hole outlet 13, and forms an opening between the upper end of this shielding plate and the cylinder 3. . Reference numeral 15 denotes an oil separation resistor disposed close to the shielding plate so as to close this opening.

In this case, the flow of the discharged gas is separated from the inner wall surface of the sealed container 1 toward the inner cylinder 3 side by the shielding plate 14, and after the oil is separated by the resistor 15, the oil pool 16 is not disturbed by the high-speed gas flow. Since it flows out of the compressor through the cavity 11, the separated oil is reliably held in the lower part of the closed container 1, that is, in the direction in which gravity acts.

In the embodiment shown in FIG. 4, the spring hole outlet 13 side is the lower part of the closed container 1,
A becomes the oil pool part A. Further, when the opposite side of the outlet 13 is the lower part of the closed container 1, the oil pool portion 16b becomes the oil pool portion B.

In this case, the oil separated by the resistor 15 flows in the axial direction (vertical direction in the drawing) to a position where there is no spring hole outlet 13, and from there it flows into the oil pool portion B16b on the opposite side of the spring hole outlet 13. Therefore, it is desirable that the mounting position of the shielding plate 14 on the inner wall surface of the closed container 1 has a slight downward slope in the direction of oil flow. Also, although not shown in the figure, the oil pool portion 16
A passage is also provided for guiding the oil to the sliding portion inside the cylinder 3.

〔Effect of the invention〕

Since the present invention is constructed as described above, there is no need to construct a discharge muffler as a separate part in a rolling piston compressor, and the compressor can be lighter and lower in cost than the conventional compressor. Furthermore, the effect of reducing noise and pressure pulsation is also improved compared to the conventional method.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional rolling piston compressor, Fig. 2 is a sectional view showing an embodiment of the present invention, Fig. 3 is an enlarged schematic diagram of the main part of Fig. 2 for explanation, and Fig. 4 is FIG. 3 is a sectional view showing another embodiment of the invention. In the figures, the same reference numerals indicate the same or equivalent parts, 1 is a closed container, 2 is an eccentric shaft, 3 is a cylinder,
4 is a compression chamber, 5 is a rolling piston, 6 is a vane, 7 is a spring, 8 is a spring hole, 8a is an expansion part, 8b is a side branch part, 9 is a discharge valve,
11 is a cavity, 12 is a discharge passage, 13 is a spring hole outlet, 14 is a shielding plate, and 15 is a resistor.

Claims (1)

[Scope of Claims] 1. An eccentric shaft rotatably supported in a horizontal direction, a cylinder forming a compression chamber substantially concentric with the rotation center of the eccentric shaft, and a cylinder mounted on the eccentric shaft that is rotated by rotation of the eccentric shaft. A rolling piston that rolls along the inner wall of the cylinder, a vane that moves reciprocally in contact with the outer circumference of the rolling piston and partitions the compression chamber into a high pressure chamber and a low pressure chamber, and a rolling vane on the back of the vane. It is equipped with a spring that presses the piston, a spring hole that houses the spring, and a discharge valve that can open and close the high-pressure chamber and the outside of the cylinder, and these are housed in a closed container that stores lubricating oil at the inner bottom. In the compressor, a discharge passage is provided that communicates from the high pressure chamber with one side above the spring hole via a discharge valve, and an outlet is provided below the spring hole near the inner bottom of the sealed container on the side opposite to the discharge passage. A rolling piston type compressor characterized by 2. A shielding plate of a predetermined height is erected at the inner bottom of the closed container at a distance from the outlet below the spring hole, and an opening is formed between the upper end of the shielding plate and the cylinder,
2. The rolling piston compressor according to claim 1, wherein the opening is closed with a resistor for oil separation.