JPH0125917B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rotary compressor, particularly a horizontal rotary compressor.

(Prior Art) In general, rotary compressors used in refrigeration equipment, etc. are vertical rotary compressors with a motor installed above the rotary compressor, or rotary compressors with a motor installed next to the rotary compressor. There is a horizontal compressor with a

This horizontal rotary compressor has the advantage of being short in vertical dimension, making it easy to incorporate into a cooling device, and to take measures against vibrations.

(Problems to be Solved by the Invention) However, in a horizontal rotary compressor, the rotating shaft is located above the oil sump, which is inconvenient in terms of oil supply to the bearing portion. For this reason, it is possible to raise the oil level up to the rotating shaft, but this would immerse the rotor of the motor in the oil, which poses the problem of an extreme increase in input power.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a horizontal rotary compressor whose bearing portion can be easily lubricated.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a cylinder block fixed in a casing with bearing blocks consisting of a bearing cylinder part and a flange part on both the left and right sides, and the left and right bearing blocks. In a horizontal rotary compressor in which a rotating shaft with a motor rotor fixed to one end is horizontally supported, a center hole passing through in the axial direction is formed in the center of the rotating shaft, and the outer part of the bearing block is A discharge gas chamber provided in the shaft is communicated with the center hole of the rotating shaft via a ventilation pipe, and a small oil supply hole is bored in at least one of the bearing blocks, which communicates with the oil reservoir at the bottom of the casing and the inner peripheral surface of the bearing cylinder. an annular groove communicating with the small oil supply hole is formed on the inner circumferential surface of the bearing cylinder portion or on the outer circumferential surface of the rotating shaft, a constricted portion is provided in the center hole of the rotary shaft, and the annular groove is formed in the constricted portion. The invention is characterized in that a small hole is bored through which the center hole of the rotating shaft communicates with the center hole of the rotating shaft, and the center hole of the rotating shaft is provided with a diaphragm at the opening of the small hole.

(Function) Due to the rotation of the rotating shaft by the motor, the discharged gas is compressed within the cylinder and guided to the discharged gas chamber.
It flows at a high speed from one end of the center hole of the rotating shaft to the other end through the ventilation pipe, and is discharged from the other end of the center hole into the casing. Therefore, the inside of the annular groove formed on the outer peripheral surface of the rotating shaft or the inner surface of the bearing cylinder becomes negative pressure due to the ejector effect of the discharge gas flowing at high speed in the center hole, and this negative pressure causes , oil is sucked up from the oil reservoir through a small oil supply hole drilled in the bearing block communicating with the annular groove, and this sucked up oil flows into the bearing part of the rotating shaft, and the part lubrication is performed.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 in the figure is a casing, a motor 2 is disposed on one side inside the casing 1, and a rotary compression device is disposed on the side of the motor 2. That is, on the side of the motor 2, a cylinder block 3 having a cylindrical cylinder chamber 3a is tightly press-fitted into the casing 1, and bearing blocks 5, 5 are disposed on both left and right sides of the cylinder chamber 3a. The flange portion 5a of the bearing block 5 closes the left and right openings of the cylindrical cylinder chamber 3a, and the rotating shaft 4 is horizontally supported by the bearing tube portion 5b. An eccentric shaft portion 4a is integrally formed on the rotating shaft 4, and the eccentric shaft portion 4a is disposed within the cylinder chamber, and the eccentric shaft portion 4a is disposed on the outer surface of the roller 6 fitted on the outer periphery of the eccentric shaft portion. A blade 7 is slidably inserted into a blade groove formed in the cylinder block 3 and is pressed against it via a spring 8. On the other hand, the rotating shaft 4
A rotor 2a of the motor 2 is attached to one end of the motor.

By the way, the rotating shaft 4 is provided with a center hole 10 that passes through it in the axial direction, and the outer side of the bearing block 5 located on the opposite side from the motor 2 is used to receive the discharged gas discharged from the cylinder. A discharge gas chamber 9 is provided. This discharge gas chamber 9 is communicated with the end of the center hole 10 of the rotating shaft 4 through a ventilation pipe 11.

The bearing block 5 is provided with small oil supply holes 13 and 14, respectively, which communicate the inner surface of the bearing cylinder portion 5b with the oil reservoir 12 located in the lower part of the casing 1.

Further, annular grooves 15 and 16 are formed on the outer periphery of the rotating shaft 4 at a portion that contacts the bearing cylinder portion 5b, and the annular grooves 15 and 16 communicate with the center hole 10 through small holes 17 and 18.

Furthermore, as shown in FIG.
Small holes 17, 1 connecting 5, 16 and the center hole 10
A constriction part 19 is formed in the center hole 10 at the opening position of 8.
will be established.

When the rotating shaft 4 is rotated by the motor 2, the refrigerant gas flows into the roller 6 in the cylinder chamber 3a.
The discharged gas is compressed by the gas and guided to the discharged gas chamber 9, and the discharged gas is moved from one end of the center hole 10 of the rotary shaft 4 to the other end at a high speed, for example, about 5 to 7 m/min, through the ventilation pipe 11. s and is discharged into the casing 1 from the other end of the center hole 10.

Therefore, the flow velocity of the discharged gas passing through the annular grooves 15 and 16 provided on the outer periphery of the rotating shaft 4 increases due to the constriction part 19 provided in the center hole 10, and the flow rate of the discharged gas passing through the annular grooves 15 and 16 increased at this high speed. The ejector effect of the flowing discharge gas creates a negative pressure through the small holes 17 and 18, and this negative pressure causes the small oil supply hole 13 bored in both bearing blocks 5 communicating with the annular grooves 15 and 16 to open. , 14, oil is sucked up from the oil reservoir 12 and supplied to the bearing portion of the rotating shaft 4 to lubricate that portion.

In this embodiment, the annular groove is formed on the outer periphery of the rotating shaft, but it may be formed on the inner periphery of the bearing block. Further, this oil supply device may be provided only on either one of the bearing blocks.

Further, as shown in FIG. 5, annular grooves 15, 16
The ejector effect can be made more effective by opening the small holes 17 and 18 between the center hole 10 and the center hole 10 at an angle in the flow direction of the discharged gas.

〔Effect of the invention〕

As described above, the present invention provides a small oil supply hole in at least one of the two bearing blocks that communicates with the oil reservoir at the bottom of the casing and the inner circumferential surface of the bearing cylinder, and the contact area between the bearing block and the rotating shaft. forming an annular groove that connects with the small oil supply hole; forming a small hole in the rotating shaft that connects the annular groove with a center hole of the rotating shaft; and communicating a discharge gas chamber with the center hole; Therefore, when the rotary compressor operates, the annular groove becomes negative pressure due to the ejector effect of the discharge gas flowing through the constriction part in the center hole of the rotating shaft, and the small oil supply hole communicating with the annular groove becomes negative pressure. Lubricating oil is sucked up from the oil reservoir at the bottom of the casing through the casing, and this sucked up oil can lubricate the bearing of the rotating shaft, making it easy to lubricate the bearing even with a horizontal rotary compressor. can be done.

Moreover, in this case, this lubricating oil tends to mix into the discharged gas flowing through the center hole of the rotating shaft, but centrifugal force caused by the rotation of the rotating shaft prevents the lubricating oil from getting mixed into the discharged gas. . Therefore, the amount of lubricating oil discharged outside the sealed container along with the discharged gas can be reduced, preventing a decrease in the amount of lubricating oil in the casing, and preventing a drop in the oil level. , stable oil supply can be performed with a stable oil level. Furthermore, since the lubricating oil in the oil reservoir is directly supplied to the sliding portion, the lubricating oil is hardly mixed with refrigerant, and good lubrication can be achieved.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing one implementation state of the present invention, Fig. 2 is an enlarged longitudinal sectional front view of the main parts, Fig. 3 is a front view of the rotating shaft bearing section, and Fig. 4 is an enlarged view of the rotating shaft bearing section. FIG. 5 is a longitudinal sectional front view showing a second embodiment of the rotary shaft bearing section. 1...Casing, 2...Motor, 2a...Rotor,
3...Cylinder block, 3a...Cylinder chamber, 4...
Rotating shaft, 4a... Eccentric shaft portion, 5... Bearing block, 5
a...Flange part, 5b...Bearing cylinder part, 6...Roller,
7...Blade, 8...Spring, 9...Discharge gas chamber, 10...Center hole, 11...Vent pipe, 12...Oil sump,
13, 14... Small oil supply hole, 15, 16... Annular groove, 1
7, 18...Small hole, 19...Aperture part.

Claims (1)

[Claims] 1. Bearing blocks consisting of a bearing cylinder part and a flange part are arranged on both the left and right sides of a cylinder block fixed in a casing, and the motor can be mounted at one end by the left and right bearing blocks. In a horizontal rotary compressor in which a rotating shaft to which a rotor is fixed is horizontally supported, a central hole passing through in the axial direction is formed at the center of the rotating shaft, and a discharge gas is provided on the outer side of the bearing block. The chamber is communicated with the center hole of the rotating shaft via a ventilation pipe, and at least one of the bearing blocks is provided with a small oil supply hole that communicates with the oil reservoir at the bottom of the casing and the inner peripheral surface of the bearing cylinder. An annular groove communicating with the small oil supply hole is formed on the inner circumferential surface of the rotary shaft or on the outer circumferential surface of the rotary shaft, a constricted portion is provided in the center hole of the rotary shaft, and the constricted portion is connected to the annular groove and the central hole of the rotary shaft. A rotary compressor characterized by having a small hole that communicates with the rotary compressor. 2. The rotary compressor according to claim 1, wherein the small hole between the annular groove on the outer periphery of the rotating shaft and the center hole is inclined in the flow direction of the discharged gas and opens into the center hole.