JP3948869B2 - Sealed multi-cylinder rotary compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hermetic multi-cylinder rotary compressor used in an air conditioner or a refrigerator.
[0002]
[Prior art]
As a technique related to a conventional multi-cylinder rotary compressor, there is one disclosed in JP-A-3-246392. As shown in FIG. 3, the eccentric shaft portions 2a and 2b of the crankshaft 1 and the eccentric shaft are disclosed. In order to lubricate between the pistons 3a and 3b that are rotatably fitted to the portions 2a and 2b, an oil hole 4 is provided in the axial direction of the crankshaft 1, and the oil hole 4 and the eccentric shaft portion 2a, A method is known in which the outer periphery of 2b is communicated with each other through communication holes 5a and 5b to supply lubricating oil. In FIG. 3, 6 is a main bearing, and 7a and 7b are upper and lower compression mechanisms.
[0003]
There is another one disclosed in Japanese Patent Laid-Open No. 63-235686, and as shown in FIG. 4, in order to ensure lubrication between the crankshaft 1 and the main bearing 6, the shaft of the crankshaft 1 There is known a technique in which a slanted oil hole 9 is provided to communicate the direction oil hole 8 and the upper compression mechanism portion 7a, and the lubricating oil is pumped up by centrifugal force. This is particularly effective as a lubricating means in the case where the compression mechanism sections are stacked in two stages, such as a two-cylinder rotary compressor, and the height of the compression mechanism section itself is relatively high.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, when the level of the lubricating oil level in the closed container is not sufficient, sufficient lubricating oil is supplied to the communication hole 5b of the lower eccentric shaft portion 2b that requires a small lift. There is a possibility that the lubricating oil may not be sufficiently supplied to the communication hole 5a of the upper eccentric shaft 2a that requires a large head. As a result, sufficient lubricating oil is not supplied to the upper compression mechanism portion 7a, and there is a possibility that the capability is reduced due to insufficient sealing, and the reliability is decreased due to insufficient lubricating oil.
[0005]
In particular, in the one disclosed in Japanese Patent Application Laid-Open No. 63-235686, the oblique oil hole 9 for ensuring lubrication between the crankshaft 1 and the main bearing 6 is compared even when the lubricating oil level is low. In order to act effectively, it is necessary to communicate with the lower part of the oil hole 8 of the crankshaft 1, and in this case, the length of the oblique oil hole 9 is increased, which makes it difficult to process.
[0006]
SUMMARY OF THE INVENTION The present invention solves such a conventional problem, and has a relatively simple structure, and can provide a highly reliable hermetic multiple that can supply sufficient lubricating oil to the two compression mechanism portions equally and to the main bearing. An object is to provide a cylinder rotary compressor.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an oil hole in the axial direction of the crankshaft, and abuts the oil hole into two chambers so as to abut the end face on the closed side of the oil hole . Oil blades are installed, and the rooms partitioned by the oil blades and the outer circumferences of the two eccentric shaft portions are communicated with each other through communication holes. As a result, the lubricating oil is independently supplied to the communication holes of the two eccentric shaft portions, so that the lubricating oil is not supplied to only one of the compression mechanism portions. Lubricating oil can be supplied evenly.
[0008]
Further, an oil groove is provided in the axial direction on the outer periphery of the eccentric shaft portion of the crankshaft, and the depth of each oil groove is deepened below the upper side in the axial direction. Thereby, centrifugal force acts with the rotation of the crankshaft, the lubricating oil is pumped up, and each eccentric shaft portion and the piston, and the space between the crankshaft and the main bearing can be lubricated.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 for solving the above-described problem is that an oil hole is provided in the axial direction of the crankshaft, and the oil hole is in contact with the end face of the closed oil hole so as to partition the oil hole into two chambers. A spiral oil blade is installed, and each room partitioned by the oil blade and the outer periphery of the two eccentric shaft portions are connected to each other through a communication hole. According to this configuration, the lubricating oil is pumped up into the oil hole of the crankshaft by the oil blade as the crankshaft rotates, and the oil hole is partitioned by the oil blade. Since the oil is independently supplied to the two eccentric shaft portions through the respective communication holes, the lubricating oil is not supplied to only one compression mechanism portion, and the lubricating oil is equally distributed to the two compression mechanism portions. Can be supplied.
[0010]
According to a second aspect of the present invention, oil grooves are provided in the axial direction on the outer periphery of the eccentric shaft portion of the crankshaft, and the depth of each oil groove is deeper below the upper side in the axial direction. According to this configuration, the centrifugal force acts on the lubricating oil flowing through the oil groove of each eccentric shaft portion as the crankshaft rotates, and the lubricating oil is pumped from the lower side in the axial direction to the upper side. The space between the pistons can be lubricated, and the space between the crankshaft and the main bearing can be lubricated.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
Example 1
In FIG. 1, inside an airtight container 11, an electric motor unit 12, two upper and lower compression mechanism units 14 a and 14 b installed in an axial direction via an intermediate partition plate 13 driven by the electric motor unit 12, and the electric motor A crankshaft 16 having two upper and lower eccentric shaft portions 15a and 15b facing each other by 180 degrees for transmitting the rotational force of the portion 12 to the compression mechanism portions 14a and 14b is provided.
[0012]
Each of the compression mechanism portions 14a and 14b has cylinders 17a and 17b, vanes (not shown) slidably installed in vane grooves (not shown) provided in the cylinders 17a and 17b, and It comprises pistons 18a and 18b that are rotatably fitted to the eccentric shaft portions 15a and 15b of the crankshaft 16. Further, a main bearing 19 and a sub-bearing 20 of the crankshaft 16 are installed at both axial ends of the compression mechanism portions 14a and 14b.
[0013]
With the above configuration, when the motor unit 12 is driven, the rotational force is transmitted to the two eccentric shaft portions 15a and 15b via the crankshaft 16, and the pistons 18a and 18b are respectively eccentrically rotated in the cylinders 17a and 17b. To compress the refrigerant gas.
An oil hole 21 is provided in the axial direction of the crankshaft 16, and a helical oil blade 22 is inserted so as to partition the oil hole 21 in the radial direction. The chambers 23a and 23b partitioned by the oil blades 22 communicate with the outer circumferences of the two eccentric shaft portions 15a and 15b through the communication holes 24a and 24b, respectively.
[0014]
According to this configuration, the lubricating oil stored at the bottom of the sealed container 11 is pumped up by the oil blades 22 installed in the oil holes 21 of the crankshaft 16 and then partitioned by the oil blades 22. The chambers 23a and 23b reach the outer circumferences of the eccentric shaft portions 15a and 15b through the communication holes 24a and 24b, respectively, and lubricate the sliding portions with the pistons 18a and 18b. Accordingly, the lubricating oil can be independently supplied to the upper and lower eccentric shaft portions 15a and 15b, and the lubricating oil is not supplied only to the lower compression mechanism portion 14b, but to the upper compression mechanism portion 14a. Can evenly supply lubricating oil.
(Example 2)
In the second embodiment shown in FIG. 2, the same parts as those shown in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.
[0015]
In the figure, oil grooves 25a, 25b are provided in the axial direction on the outer circumferences of the eccentric shaft portions 15a, 15b of the crankshaft 16, and the depth of each oil groove 25a, 25b is deeper below the upper side in the axial direction. It is a thing.
According to this configuration, along with the rotation of the crankshaft 16, the lubricating oil is first pumped upward by centrifugal force through the oil groove 25b of the lower eccentric shaft portion 15b, and then the upper eccentric shaft portion 15a. Lubricating oil is pumped up further through the oil groove 25a. Thereafter, the lubricating oil that has reached the upper compression mechanism portion 14 a lubricates between the crankshaft 16 and the main bearing 19. Therefore, it is possible to lubricate between the eccentric shaft portions 15a and 15b and the pistons 18a and 18b, and to lubricate between the crankshaft 16 and the main bearing 19 with the lubricating oil that has lubricated the upper eccentric shaft portion 15a.
[0016]
【The invention's effect】
As apparent from the above embodiment, according to the first aspect of the present invention, since the lubricating oil can be supplied independently to the two eccentric shaft portions, the lubricating oil is supplied only to one compression mechanism portion. There is no such a situation, and the lubricating oil can be evenly supplied to the two compression mechanisms.
[0017]
According to the second aspect of the present invention, it is not necessary to provide an oblique oil hole or the like in order to ensure lubrication between the crankshaft and the main bearing, and each eccentric shaft portion can be pumped up in order from the lower side. The lubricating oil can lubricate between the eccentric shaft portions and the pistons, and can lubricate the crankshaft and the main bearing.
Needless to say, when the inventions according to the first and second aspects are combined, the lubricity and reliability are further improved.
[0018]
As described above, a highly reliable compressor that can supply equal lubricating oil to the two compression mechanisms and supply sufficient lubricating oil to the main bearing with a relatively simple configuration as described above. Obtainable.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a sealed multi-cylinder rotary compressor showing Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view of an essential part of the sealed multi-cylinder rotary compressor showing Embodiment 2 of the present invention. FIG. 3 is a longitudinal sectional view of a main part of a conventional hermetic multi-cylinder rotary compressor. FIG. 4 is a longitudinal sectional view of another conventional hermetic multi-cylinder rotary compressor.
DESCRIPTION OF SYMBOLS 11 Sealed container 12 Electric motor part 13 Intermediate | middle partition plates 14a and 14b Compression mechanism parts 15a and 15b Eccentric shaft part 16 Crankshafts 17a and 17b Cylinders 18a and 18b Piston 19 Main bearing 20 Sub bearing 21 Oil hole 22 Oil blade 23a, 23b Room 24a 24b Communication holes 25a, 25b Oil groove

Claims (2)

In order to transmit the rotational force of the motor part to the compression mechanism part, the two compression mechanism parts installed in the axial direction via the intermediate partition plate driven by the motor part and the motor part inside the sealed container A crankshaft having two eccentric shaft portions opposed to each other by 180 degrees, and each of the two compression mechanism portions is provided with a cylinder and a vane slidably installed in a groove provided in the cylinder. A piston that is rotatably fitted to the eccentric shaft portion of the crankshaft, and a main bearing and a sub-bearing of the crankshaft are installed at both axial ends of the two compression mechanism portions. In addition, an oil hole having a lower end opened in the axial direction of the crankshaft and an upper end closed is provided, and the oil hole is spirally brought into contact with the end face on the closed side of the oil hole so as to partition into two chambers. the Jo of the oil wings installed, before Partitioned by oil vanes, the oil holes of the opened side of two which opens room, sealed, wherein each be provided with a communication hole to communicate with any of the outer periphery of the two eccentric shaft portions multi Cylinder rotary compressor.   In order to transmit the rotational force of the electric motor part to the compression mechanism part, the two compression mechanism parts installed in the axial direction via the intermediate partition plate driven by the electric motor part and the electric motor part inside the sealed container A crankshaft having two eccentric shaft portions that are opposed to each other by 180 degrees, and each of the two compression mechanism portions is a cylinder and a vane that is slidably installed in a groove provided in the cylinder. And a piston that is rotatably fitted to an eccentric shaft portion of the crankshaft, and a main bearing and a sub-bearing of the crankshaft are installed at both axial ends of the two compression mechanism portions. In addition, an oil groove is provided in the axial direction on the outer periphery of the eccentric shaft portion of the crankshaft, and the depth of each oil groove is deeper below the upper side in the axial direction. Type compressor.

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