JPH03233180A - Oil supply device for closed type rotary compressor - Google Patents

Abstract

PURPOSE:To absorb acting force of a pump shaft by providing a hollow part, in which oil in an oil reservoir is introduced, in a casing of a displacement type pump, provided with the pump shaft having a passage connected to a supply oil path of a main shaft, and further supporting the shaft by an elastic body. CONSTITUTION:A main shaft 23, having a supply oil path 24 in a direction of an axial line, is provided in a closed vessel 21 having an oil reservoir 22. A pump shaft 36, having a passage 37 of communicating with the supply oil path 24, is secured to the main shaft 23, and a displacement type pump 39 is formed of a pump part A having inner and outer rotors, housing 42 and a cover unit 43. Oil in the oil reservoir 22 is introduced into a space part 46 via a supply oil pipe 50 to go into the passage 37. Generation of oil leakage, caused by wearing due to contact of the pump shaft, is prevented by absorbing acting force from the pump shaft 36, applied to the housing 42 at the time of operation, by a coil spring 51. Accordingly, the oil can be surely supplied by the displacement type pump. And also assembly work is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating device for a hermetic rotary compressor used in equipment such as air conditioners or refrigerators.

[Conventional technology]

Conventionally, this type of hermetic rotary compressor was developed in Japanese Patent Application Laid-open No. 59-12.
A horizontal expansion compressor is disclosed in Japanese Patent No. 0796, and is constructed as shown in FIG. To explain this based on the same figure, in the same figure, the symbol 1 is a cylindrical sealed container with an oil reservoir 2 at its bottom and a central axis extending in the horizontal direction, and 3 is this sealed container 1. A main shaft 5 provided therein and rotated by a motor 4 is a compression mechanism (internal) connected to the main shaft 3 and having a compression chamber 6 for compressing fluid. The compression mechanism 5 is provided with an oil reservoir pocket 7 that opens upward and a passage 8 that supplies oil in the oil reservoir pocket 7 to each bearing. Also,
9 is a splasher fixed on the main shaft 3 and splashes oil into the oil reservoir pocket 7; 10 and 11 are suction pipes and discharge pipes that open into and out of the sealed container 1; and 12 is a suction space in the sealed container 1. This is a communication pipe that communicates the intake port of the compression mechanism 5 with the intake port of the compression mechanism 5.

In the hermetic rotary compressor configured in this way,
The fluid sucked into the closed container 1 from the suction pipe 10 passes through the air gap of the motor 4 as shown by the solid arrow in FIG. is expelled to the outside. At this time, the motor 4 is cooled by the fluid.

On the other hand, the oil in the oil reservoir 2 is splashed by the splasher 9 as shown by the dashed arrow in FIG. 6, passes through the oil reservoir pocket 7 and the passage 8, and is supplied to each bearing.

[Problem to be solved by the invention]

By the way, in the lubrication system for this type of horizontal expansion compressor (including a variable speed vertical compressor), the lubrication method for each bearing is a splash lubrication method using the splasher 9, so it is not a forced lubrication method. In comparison, there was a problem in that a sufficient amount of oil supply could not be ensured, and reliability in bearing oil supply deteriorated.

Therefore, it is conceivable to install a positive displacement pump at the end of the main shaft 3, but in this case, it is necessary to fix the casing of the positive displacement pump in the closed container 1, and the axis of the pump drive shaft must be adjusted when assembling the pump. Great care was taken to align the axis of the main shaft 3 with the axis of the spindle 3. In other words, if the axis of the pump drive shaft and the axis of the main shaft are not aligned, the main bearing may be damaged due to the inclination of the main shaft 3, or the pump may malfunction due to the inclination of the pump drive shaft. . As a result, there was an inconvenience that the assembly work of the compressor was made difficult.

The present invention has been made in view of the above circumstances, and provides a lubricating device for a hermetic rotary compressor that can improve the reliability of bearing lubricating and also facilitate the assembly work of the compressor. It is something that is offered as a donation.

[Means to solve the problem]

The oil supply device for a hermetic rotary compressor according to the present invention has a pump shaft having a passage communicating with an oil supply path fixed to the tip of the main shaft, and houses a pump section driven by the rotation of the pump shaft and this pump section. A positive displacement pump is provided in a closed container, and the casing of the positive displacement pump has a hollow part for introducing oil in an oil reservoir, and is held in the closed container via an elastic body. be.

[For production]

In the present invention, each bearing can be lubricated by a positive displacement pump during operation, and the acting force from the pump shaft can be absorbed by the elastic body.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be explained in detail by the Example shown in the figure.

FIG. 1 is a sectional view showing the entire oil supply system for a hermetic rotary compressor according to the present invention, and FIGS. 2 and 3 similarly show essential parts of the oil supply system for a hermetic rotary compressor according to the present invention. They are an exploded perspective view and a sectional view.

In the figure, what is designated by the reference numeral 21 is a closed container having an oil reservoir 22 at its bottom, and is formed of a cylindrical body whose central axis extends in the horizontal direction.

23 is a main shaft having an oil supply passage 24 extending in the axial direction;
It is rotatably provided within the closed container 21. A compression chamber 25 for compressing fluid is provided at an example tip of the main shaft 23.
A compression mechanism 26 is connected thereto. Reference numeral 27 denotes a drive device for rotating the main shaft 23, which includes a motor stator 28 and a motor rotor 29, and is provided inside the closed container 21. Reference numeral 30 denotes a metal plate serving as a first elastic body, which has a through hole 31 in the center thereof through which the other end of the main shaft 23 is inserted;
is maintained. Reference numeral 32 designates a metal plate serving as a second elastic body that holds a positive displacement pump, which will be described later, and includes two support legs 33 attached to the first elastic body 30, and a metal plate 32 that is held by these support legs to prevent the housing from rotating. through hole 3
4 and a pump holding piece 35 having a diameter of 4, and is provided inside the airtight container 21. Reference numeral 36 denotes a pump shaft extending in the horizontal direction, and is fixed to the other end of the main shaft 23 by shrink fitting or press fitting. This pump shaft 36 includes a passage 37 communicating with the oil supply passage 24 and this passage 3
Through holes 38 are provided that open on both sides of 7. 39
is a positive displacement pump such as a trochoid pump, and has an inner rotor 40 driven by the rotation of the pump shaft 36.
and a pump section A having an outer rotor 41 provided around the inner rotor 40;
A casing 4 having a housing 42 for storing therein and a lid 43 for closing an opening of the housing.
4, the pump holding piece 3 of the second elastic body 32
It is held by 5. The housing 42 of this pump 39 is provided with an annular groove 45 for mounting a spring on the back side, and has a space 4 inside that communicates with the through hole 38.
6 is formed. Further, the lid body 43 faces into the through hole 34 and is fixed to the housing 42 by, for example, screws 47. Note that a notch 48 for preventing rotation is provided on the outer circumferential surface of the lid body 43 and the pump shaft 36.
49 are formed respectively. Reference numeral 50 designates an oil supply pipe whose tip end faces into the oil reservoir 22, and is attached to the externally exposed end of the lid body 43. The oil in the oil reservoir 22 flows through the oil supply pipe 50 to the space 4 in the housing 42.
6 will be introduced. A coil spring 51 is a third elastic body that presses the housing 42 against the pump holding piece 35, and is elastically mounted between the metal plate 30 and the displacement pump 39.

Next, the oil supply system of the oil supply system for the hermetic rotary compressor configured as described above will be explained.

That is, the inner rotor 40 is rotated by the rotation of the main shaft 23.
When rotates, a pumping action occurs between the inner rotor 40 and the outer rotor 41, and this pumping action causes the oil in the oil reservoir 22 to flow from the oil supply pipe 50 to the space 46 to the through hole 38 to the passage as shown by the solid line arrow. 37 - The oil is supplied to each bearing via the oil supply path 24.

At this time, the pump shaft 36 rotates and the closed container 21
Since the housing 42 of the positive displacement pump 39 is tilted relative to the housing 42, the housing 42 of the positive displacement pump 39 swings. For this reason, if the housing 42 is currently fixed to the closed container 21, the pump shaft 36 will come into contact with it, causing abnormal wear, and oil will leak from this worn part, resulting in insufficient lubrication. Not done.

However, in the oil supply system for a hermetic rotary compressor according to this embodiment, the acting force from the pump shaft 36 that is applied to the housing 42 during operation can be absorbed by the two metal plates 30, 32 and the coil spring 51. ,
There are no problems like the ones mentioned above.

Furthermore, in this embodiment, each bearing can be lubricated by the positive displacement pump 39 during operation.
A sufficient amount of oil can be ensured for each bearing.

In this embodiment, the housing 42 of the positive displacement pump 39 is held in the closed container 21 by two metal plates 30, 32 and one coil spring 51, but the present invention is not limited to this. It is not limited to
By one coil spring 61 as shown in FIG. 4 or by two metal plates 62.6 as shown in FIG.
Even if the coil springs 64 to 66 are held within the closed container 21, the same effects as in the embodiment can be obtained.

Furthermore, although this embodiment shows an example in which it is applied to a horizontal rotary compressor, the present invention is not limited to this and can of course be applied to a vertical rotary compressor in the same manner as in the embodiment. be. In this case, the oil supply pipe 50 required for the horizontal rotary compressor is unnecessary.

〔Effect of the invention〕

As explained above, according to the present invention, a pump shaft having a passage communicating with the oil supply path is fixed to the tip of the main shaft, and a pump section driven by the rotation of the pump shaft and a casing housing the pump section are provided. A positive displacement pump with
Since it has a hollow part into which oil in the oil reservoir is introduced and is held in a closed container via an elastic body, each bearing can be supplied with oil by a positive displacement pump during operation.

Therefore, it is possible to ensure a sufficient amount of oil to be supplied to each bearing, thereby increasing the reliability of bearing oil supply. In addition, since the acting force from the pump shaft that is applied to the housing of the positive displacement pump during operation can be absorbed by the elastic body, it is possible to absorb slight misalignment between the axis of the pump drive shaft and the axis of the main shaft during assembly. This makes it easy to assemble the compressor.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the entire oil supply system for a hermetic rotary compressor according to the present invention, and FIGS. 2 and 3 similarly show essential parts of the oil supply system for a hermetic rotary compressor according to the present invention. An exploded perspective view and a sectional view, FIGS. 4 and 5 are schematic views showing other embodiments, and FIG. 6 is a sectional view showing a conventional oil supply device for a hermetic rotary compressor. 21... airtight container, 22. ,,,oil sump, 23...
・. Main shaft, 24..., Oil supply path, 26... Compression mechanism, 3
0゜32...Metal plate, 36...Pump shaft, 37
...Passage, 39...Displacement pump, 44...
-Casing, 46..., space section, 50...coil spring, A...pump section. Agent Masu Oiwa Leaving work 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A sealed container that has an oil reservoir at its bottom, a main shaft that is rotatably provided in the sealed container and has an oil supply passage extending in the axial direction, and a compression mechanism that is connected to the main shaft and compresses fluid. A displacement type rotary compressor, in which a pump shaft having a passage communicating with the oil supply path is fixed to the tip of the main shaft, a pump part driven by rotation of the pump shaft, and a casing housing the pump part. A pump is provided in the sealed container, and the casing of the positive displacement pump has a hollow part for introducing oil in the oil reservoir, and is held in the sealed container via an elastic body. Lubricating device for hermetic rotary compressor.