JPH0584399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement of a multi-cylinder rotary compressor using an intermediate partition plate.

(b) Conventional technology A conventional multi-cylinder rotary compressor is, for example,
It is configured as shown in Publication No. 174787. Here, a conventional example will be explained with reference to this publication. In Fig. 3, reference numeral 1 denotes a closed container, in which an electric element 2 is housed in the upper part, and two rotary compression elements 4 and 5 driven by a rotating shaft 3 of the electric element are housed in the lower part. There is. Reference numeral 6 denotes an intermediate partition plate that partitions the rotary compression elements 4 and 5. The rotary compression elements 4 and 5 are the cylinders 7 and 8 and the rotary shaft 3, respectively.
Rollers 11 and 12 rotate within the cylinders 7 and 8 by eccentric portions 9 and 10 whose rotation angles are shifted by 180°, and vanes 13 that come into contact with the rollers and divide the insides of the cylinders 7 and 8 into a high pressure area and a low pressure area. 14, an upper bearing 15 and a lower bearing 16 that close the openings of the cylinders 7 and 8. This upper bearing is provided with a discharge port 19 that communicates with spaces 17 and 18 formed by the rollers 11 and 12 and the rotating shaft 3. The rotating shaft 3 has an oil reservoir 20 at the bottom of the closed container 1.
An oil supply hole 21 is drilled through which oil stored in the slider is supplied to each sliding portion. 22 and 23 are eccentric portions 9;
This lead-out hole is formed in the grooves 24 and 2 provided in the axial direction on the outer periphery of the eccentric parts 9 and 10.
5 and the oil supply hole 21 are communicated with each other.

In the multi-cylinder rotary compressor with this structure, oil stored in the oil reservoir 20 is transferred from the oil supply hole 21 to the outlet hole 22,
The liquid is supplied to each sliding portion of the rotary compression elements 4 and 5 via 23 and discharged from the discharge port 19.

(c) Problems to be solved by the invention However, the space 1 of the lower rotary compression element 5
Since the oil that has flowed out into the upper rotary compression element 4 is discharged from the discharge port 19 through the space 17 of the upper rotary compression element 4, the length of the discharge passage becomes longer and it becomes difficult to discharge the oil, or the oil may be mixed with the oil. There is a problem in that the gas refrigerant contained in the rotary compressor element 5 is stagnated in the intermediate partition plate 6, making it difficult for the oil to flow in the space 18 of the lower rotary compressor element 5, and causing the rotary compressor element 5 to wear out due to deterioration of the oil. Ta.

The object of the present invention is to circulate oil supplied to each sliding portion of a rotary compression element so that new oil is constantly supplied to each sliding portion.

(d) Means for Solving the Problems This invention provides an oil reservoir for lubricating the sliding parts in the intermediate partition plate, and provides a hole in the intermediate partition plate that communicates the oil reservoir with the outside of the rotary compression element. It was drilled.

(E) Effect This invention provides a method of preventing oil from being supplied to the sliding parts through the hole by providing a hole in the intermediate partition plate that communicates between the oil reservoir for lubricating the sliding part and the outside of the rotary compression element. is discharged to the outside of the rotary compression element to facilitate the flow of oil supplied to this sliding part.

(F) Embodiments The present invention will be described below based on embodiments shown in FIGS. 1 and 2.

Inside the closed container 1, an electric element 2 is housed in the upper part, and two rotary compression elements 4 and 5 driven by a rotating shaft 3 of the electric element are housed in the lower part. 26
is an intermediate partition plate that partitions the rotary compression elements 4 and 5. The rotary compression elements 4 and 5 have cylinders 7 and 8 and eccentric portions 9 and 1 of the rotating shaft 3 whose rotation angles are shifted by 180°, respectively.
Roller 1 rotates in cylinders 7 and 8 due to
1, 12, and cylinders 7, 8 in contact with this roller.
Vane 1 that divides the inside into a high pressure area and a low pressure area
3, 14, and the vane 1 by drilling into the cylinders 7, 8.
guide grooves 27 and 28 for guiding the vanes 13 and 14; vane chambers 29 and 30 that are connected to the guide grooves and formed on the rear end side of the vanes 13 and 14; and an upper bearing that closes the openings of the cylinders 7 and 8. 15 and a lower bearing 16. The rotary shaft 3 is provided with an oil supply hole 21 for supplying oil stored in an oil reservoir 20 at the inner bottom of the closed container 1 to each sliding portion. 22,
Reference numeral 23 denotes a lead-out hole drilled in the eccentric parts 9, 10, which communicates the oil supply hole 21 with grooves 24, 25 provided in the axial direction on the outer periphery of the eccentric parts 9, 10. 17 is a first space formed by the roller 11 of the upper rotation compression element 4 and the rotation shaft 3; 18 is a second space formed by the roller 12 of the lower rotation compression element 5 and the rotation shaft 3. be. The first space and the second space communicate with each other through the insertion hole 31 of the rotating shaft 3 of the intermediate partition plate 26. A first oil discharge hole 32 is bored in the upper bearing 15 and communicates with the first space 17, and this first oil discharge hole opens above the vane 13. 33 is a second hole bored in the intermediate partition plate 26.
This second oil discharge hole opens into the insertion hole 31 of the intermediate partition plate 26 . 34,3
5 is a horizontal hole bored in the rotating shaft 3, and this horizontal hole supplies oil to the sliding surfaces of the upper bearing 15 and the lower bearing 16. 36 is a communication hole bored in the intermediate partition plate 26, and this communication hole is connected to the upper rotary compression element 4.
The vane chamber 29 of the rotary compression element 5 and the vane chamber 30 of the lower rotary compression element 5 are communicated with each other.

In the multi-cylinder rotary compressor configured as described above, the refrigerant flowing into the cylinders 7 and 8 of the rotary compression elements 4 and 5 is transferred to the eccentric portions 9 and 1 whose rotation angles are shifted by 180°.
The compressed air is compressed by the cooperation of rollers 11 and 12 rotated by zero and vanes 13 and 14 that reciprocate in guide grooves 27 and 28 in contact with these rollers.
These vanes always slide in opposite directions; when one vane 13 moves in a direction that reduces the volume of the vane chamber 29, the other vane 14 moves in a direction that increases the volume of the vane chamber 30, and one vane chamber 29 The oil accumulated in the vane chamber 30 is moved to the other vane chamber 30 through the communication hole 36 of the intermediate partition plate 26, and the oil is transferred to the vane chamber 30.
3 and 14 so that there is no resistance during the reciprocating movements.

Oil is supplied to each sliding part from the oil supply hole 21 of the rotating shaft 3 through the outlet holes 22, 23 of the eccentric parts 9, 10 through the grooves 2 provided on the outer periphery of the eccentric parts 9, 10.
4, 25 while lubricating the sliding surface of this eccentric part.
The space 17 and the second space 18 are supplied. and,
The oil supplied to the first space 17 and the second space 18 is supplied to other sliding parts, and is also supplied from the first oil discharge hole 32 and the second oil discharge hole 33 to the oil sump inside the closed container 1. It is discharged at 20. For this reason,
New oil is supplied to the first space 17 and the second space 18. The oil supplied to the first space 17 is discharged from the first oil discharge hole 32 and the vane 1
3 and the sliding surface of the guide groove 27, and the oil sump part 20
This prevents lubrication failure from occurring when the oil level drops. Further, the oil supplied to the second space 18 is discharged from the second oil discharge hole 33, and the oil that is difficult to be discharged from the first oil discharge hole 32 of the upper bearing 15 is discharged.

In addition, in the above description, each rotary compression element 4,
5, the discharge holes 32 and 33 are provided in the upper part of the intermediate partition plate, but even if the discharge outlet is provided only in the intermediate partition plate, the distance between the discharge hole and the space of the rotary compression elements arranged above and below the intermediate partition plate is the same. It goes without saying that the oil in each space will be discharged together.

(G) Effects of the invention In this invention, an oil reservoir for lubricating the sliding parts is provided in the intermediate partition plate, and a hole is bored in the intermediate partition plate to communicate the oil reservoir with the outside of the rotary compression element. Therefore, the oil supplied to the reservoir can be discharged from the hole to the outside of the rotary compression element, and new oil is constantly supplied to this reservoir, allowing the sliding parts to be cooled and lubricated.

[Brief explanation of the drawing]

1 and 2 show the present invention, FIG. 1 is a sectional view of a rotary compressor, FIG. 2 is a plan view of an intermediate partition plate, and FIG. 3 is a sectional view of a conventional rotary compressor. . 1... Airtight container, 2... Electric element, 3, 4...
Rotary compression element, 26... intermediate partition plate, 33... second oil discharge hole.

Claims (1)

[Claims] 1.Equipped with a closed container having an oil reservoir at the bottom, an electric element housed in the container, and a plurality of rotary compression elements driven by the electric element, with an intermediate partition between each rotation compression element. A multi-cylinder rotary compressor separated by a plate, wherein the intermediate partition plate is provided with an oil reservoir and a hole that communicates the oil reservoir with the inside of the closed container. compressor.