KR100624658B1 - Multi-cylinder type rotary compressor - Google Patents

Abstract

Disclosed is a multi-cylinder rotary compressor which minimizes the leakage of compressed gas to increase the compression efficiency and reduces the friction of the roller to improve the durability and performance of the device. The multi-cylinder compressor includes first and second compression chambers provided to be partitioned by an intermediate plate, and first and second rollers respectively installed in the first and second compression chambers to compress gas. A plurality of pressure generating grooves in a herringbone shape are formed on both sides of the intermediate plate in contact with the first and second rollers.

Description

Multi-cylinder rotary compressor {MULTI-CYLINDER TYPE ROTARY COMPRESSOR}

1 is a cross-sectional view showing the configuration of a multi-cylinder rotary compressor according to the present invention.

FIG. 2 is a cross-sectional view taken along line II-II 'of FIG. 1.

3 is a cross-sectional view taken along line III-III ′ of FIG. 1.

Figure 4 is a perspective view showing the structure of the intermediate plate of the multi-cylinder rotary compressor according to the present invention.

Figure 5 is a detailed view showing the configuration of the pressure generating grooves formed in the intermediate plate of the multi-cylinder rotary compressor according to the present invention.

Explanation of symbols on the main parts of the drawings

10: airtight container, 20: electric mechanism part,

21: axis of rotation, 22: stator,

23: rotor, 30: compression mechanism,

31: the first compression chamber, 32: the second compression chamber,

35: middle plate, 42: first roller,

52: second roller, 70: pressure generating groove.

The present invention relates to a multi-cylinder rotary compressor, and more particularly to a multi-cylinder rotary compressor to reduce the friction of the roller and to minimize the pressure loss of each compression chamber.

In general, a multi-cylinder rotary compressor includes a plurality of compression chambers which are partitioned from each other, and the rollers inside each compression chamber rotate to maintain opposite positions, thereby minimizing a change in rotation torque and an imbalance of mass.

An example of such a multi-cylinder rotary compressor is disclosed in Japanese Laid-Open Patent Publication No. 2001-153079 (June 5, 2001). The compressor has a first cylinder body in the upper portion in which the first compression chamber is formed, a second cylinder body in which the second compression chamber is formed and is installed in the lower portion of the first cylinder body, and an intermediate plate for partitioning between the two compression chambers. . In addition, the compressor has a first and a second roller to perform the compression operation while maintaining the opposite position inside each compression chamber when the rotating shaft rotates, and eccentric rotation, each compression chamber for the suction of gas into each compression chamber It has a first and a second suction port in communication with the interior.

In this multi-cylinder rotary compressor, when the compression operation is performed, the first and second rollers of each compression chamber rotate and rotate at a high speed, so that a large friction occurs between each roller and the intermediate plate. In general, the rotary compressor can reduce the leakage of the compressed gas when the gap between the roller and the intermediate plate is small, thereby increasing the compression efficiency, but when the gap is too small, the friction and wear of the contact portion is increased. Therefore, in order to smoothly operate and improve the performance of the rotary compressor, it is necessary to properly maintain the gap between the roller and the intermediate plate to minimize the friction between the roller and the intermediate plate while reducing the leakage of compressed gas.

The present invention has been made in view of these points, the object of the present invention is to minimize the phenomenon of leakage of compressed gas to increase the compression efficiency, to reduce the friction of the roller to improve the durability and performance of the device. It is to provide a cylinder rotary compressor.

The multi-cylinder compressor according to the present invention for achieving this purpose, the first and second compression chambers are provided to be partitioned by the intermediate plate and the first and second compression chambers respectively installed in the first and second compression chambers to perform the compression of the gas It is provided with a first and a second roller, characterized in that a plurality of pressure generating grooves in a herringbone shape formed on both sides of the intermediate plate in contact with the first and second roller.

In addition, the pressure generating grooves are provided with a bent portion, characterized in that the bent portion is directed toward the rotation direction of the rollers.

The pressure generating grooves may be spaced apart from each other in the rotational direction of the rollers.

Hereinafter, with reference to the accompanying drawings a preferred embodiment according to the present invention will be described in detail.

The multi-cylinder rotary compressor according to the present invention, as shown in Figure 1, is installed on the inner side of the electric mechanism part 20 and the inner side of the hermetic container 10, which is installed on the inner upper portion of the hermetic container 10 to generate a rotational force And it is provided with a compression mechanism (30) connected through the power mechanism 20 and the rotating shaft (21).

Power mechanism 20 is a cylindrical stator 22 is fixed to the inner surface of the sealed container 10, and the rotor is rotatably installed in the interior of the stator 22, the center of which is coupled to the rotating shaft 21 ( 23).

As shown in FIGS. 1 to 3, the compression mechanism part 30 includes a first cylinder body 33 having a cylindrical first compression chamber 31 formed therein, and a cylindrical second compression chamber 32 formed therein. ) Is formed and the second cylinder body 34 installed below the first cylinder body 33, respectively in the interior of the first compression chamber 31 and the second compression chamber 32 to perform the compression operation of the gas And first and second compression apparatuses 40 and 50 provided. The rotating shaft 21 extending from the power transmission mechanism 20 is the center of the first and second compression chambers (31, 32) to operate the compression apparatus (40, 50) in each compression chamber (31, 32) It is installed in the form of penetrating.

In addition, the compression mechanism 30 is an intermediate plate 35 interposed between the first and second cylinder bodies 33 and 34 to partition the first compression chamber 31 and the second compression chamber 32 in the upper portion. ), The upper part of the first cylinder body 33 and the second cylinder body so as to support the rotating shaft 21 while closing the upper opening of the first compression chamber 31 and the lower opening of the second compression chamber 32. And first and second shaft support members 36 and 37 mounted below the 34, respectively.

The first and second compression units 40 and 50 installed in each of the compression chambers 31 and 32 have first and second eccentric portions 41 provided on the outer surfaces of the rotation shafts 21 of the compression chambers 31 and 32. And 51 and first and second rollers rotatably coupled to the outer surfaces of the first and second eccentric portions 41 and 51 so that the outer surfaces rotate in contact with the inner surfaces of the respective compression chambers 31 and 32. 42, 52 and the inner space of each compression chamber (31, 32) to the suction side and discharge side while advancing in the radial direction of each compression chamber (31, 32) in accordance with the rotation of the rollers (42, 52) A first vane 43 and a second vane 53 and a first vane spring 44 and a second vane spring 54 for pressing the vanes toward the rollers 42 and 52 (Figs. 2 and Fig. 2). 3). At this time, the first eccentric portion 41 and the second eccentric portion 51 provided on the outer surface of the rotating shaft 21 are arranged to be eccentric in opposite directions. This is to minimize the change of rotational torque and reduce vibration when the compression operation is made by maintaining the balance on both sides.

In addition, first and second suction ports 61 and 62 through which gas flows into the compression chambers 31 and 32 are formed in the cylinder bodies 33 and 34, respectively, and first suction ports 61 and 62 are provided in the first and second suction ports 61 and 62, respectively. And second suction pipes 63 and 64 are respectively connected. In addition, a first discharge port 65 and a second discharge port 66 are formed in the upper first shaft support member 36 and the lower second shaft support member 37 to discharge the pressurized gas (FIG. 2). And FIG. 3). In FIG. 1, reference numeral 13 denotes an accumulator installed in the suction pipe 11, and 12 denotes a discharge pipe for guiding the compressed gas inside the sealed container 10 to the outside.

The multi-cylinder rotary compressor maintains a position in which the first and second eccentric portions 41 and 51 in the first and second compression chambers 31 and 32 are opposed by the operation of the power mechanism 20. And the first and second rollers 42 and 52 rotate eccentrically in each of the compression chambers 31 and 32 and suck the gas toward the first and second suction ports 61 and 62 inwardly. Compression is performed by pressurizing and ejecting toward the first and second discharge ports 65 and 66.

In addition, the compressor of the present invention minimizes friction generated between the lower end of the first roller 42 and the upper surface of the intermediate plate 35 and the upper end of the second roller 52 and the lower surface of the intermediate plate 35 when such a compression operation is performed. At the same time, as shown in FIG. 4, the first and second rollers 425 and 25 may be minimized to minimize the problem of leakage of compressed gas into the gap between the rollers 42 and 52 and the intermediate plate 35. It is provided with a plurality of pressure generating grooves 70 formed in a herringbone shape on both sides of the intermediate plate 35 in contact with the.

Herringbone type pressure generating grooves 70, as shown in Figure 5, consists of grooves of a predetermined width finely recessed to a depth of about 5 ~ 50㎛ from the surface of the intermediate plate (35). That is, as shown in Figure 5, the pressure generating grooves 70, the first inclined groove 71 and the second inclined groove 72 inclined in the direction crossing each other is formed in a herringbone shape.

In addition, a plurality of pressure generating grooves 70 are formed to be spaced apart from each other in the rotational direction of the rollers 42, 52, the central bending portion 73 is the rotational direction of the rollers (42, 52) (arrow "A" Direction). These pressure generating grooves 70 are formed by etching the surface of the intermediate plate 35 using a chemical or by a conventional sand blast (sand blast) method.

The function of the pressure generating grooves 70 is as follows.

As shown in FIG. 5, when the first and second rollers 42 and 52 rotate in the direction of arrow A during the compression operation, the lower end of the first roller 42 and the upper end of the second roller 52 are shown. Each of the pressure generating grooves 70 of the intermediate plate 35 rotates in contact with the formed portion. At this time, the lubricating oil and gas existing in the gap between the rollers 42 and 52 and the intermediate plate 35 flow into the pressure generating grooves 70, and the pressure is generated by the rotation of the rollers 42 and 52. The pressure rises by flowing in the grooves 70. That is, the oil and gas of the first inclined groove 71 of the pressure generating grooves 70 flow toward the bent portion 73 by the rotation of the rollers 42 and 52, and the second of the pressure generating grooves 70. Since the oil and gas of the inclined groove 72 also flow toward the bent portion 73, the pressure at the bent portion 73 of the pressure generating grooves 70 increases. Thus, the pressure between the rollers 42 and 52 and the intermediate plate 35 rises.

This increase in pressure reduces the friction force between the rollers 42 and 52 and the intermediate plate 35 so that the rollers 42 and 52 rotate smoothly, and the rollers 42 and 52 and the intermediate plate ( It is possible to increase the durability of the device by reducing the wear of 35). In addition, such a pressure increase may minimize the problem of leakage of compressed gas through the gap between the rollers 42 and 52 and the intermediate plate 35 from each of the compression chambers 31 and 32, thereby improving the compression efficiency.

As described in detail above, the multi-cylinder rotary compressor according to the present invention because the pressure rises in the gap between the intermediate plate and each roller by the herringbone-shaped pressure generating grooves formed on the surface of the intermediate plate rollers and the intermediate plate Reduced friction between the device smooth operation and improved durability, as well as the compression gas leakage is minimized has the effect of improving the compression efficiency.

Claims (3)

In a multi-cylinder rotary compressor comprising a first and a second compression chamber provided to be partitioned by an intermediate plate, and a first and a second roller which are respectively installed in the first and second compression chamber to compress the gas. , And a plurality of pressure generating grooves having a herringbone shape formed on both surfaces of the intermediate plate in contact with the first and second rollers. The method of claim 1, The pressure generating grooves are provided with a bent portion, the bent portion is a multi-cylinder rotary compressor, characterized in that the direction of rotation of the rollers. The method of claim 1, And the pressure generating grooves are spaced apart from each other in the rotational direction of the rollers.

Images