JPH0122955Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to an oil supply mechanism for a horizontal rotary compressor incorporated in an air conditioner or the like.

(Prior art) As shown in Fig. 1, for oil supply of a rotary compressor, in the case of a vertically installed type, there is an oil sump B at the bottom of a casing A, and the oil level height of this oil sump B is a. Even if the main shaft C is low, the lower end of the main shaft C is located below, so that the sub bearing D, the cylinder E, the main bearing F, etc. can be easily supplied with oil via the main shaft C.

However, as shown in Fig. 2, the horizontal rotary compressor has advantages such as having a short vertical dimension and being easy to incorporate into a set and take measures against vibration. Since it is located in the center and above the oil level height a of the oil sump B, it is disadvantageous in terms of oil supply. Since the rotor H is immersed in oil and the input is extremely increased, making it impossible to operate, there is a need for a mechanism for easily supplying oil to the bearings and cylinders of a horizontal rotary compressor.

(Problem to be solved by the invention) As mentioned above, in conventional horizontal rotary compressors, the main shaft is located approximately in the center of the casing and is located above the oil level in the oil sump, making it difficult to supply oil. In addition, it was impossible to raise the oil level to the level of the main shaft because the rotor of the motor would be immersed in oil and the input power would increase dramatically.

Therefore, the purpose of this invention is to create a horizontal rotary structure that can raise the oil level without the motor rotor being immersed in the oil, and that can prevent the oil level from decreasing and provide good lubrication. An object of the present invention is to provide a compressor oil supply mechanism.

[Structure of the invention]

(Means for Solving the Problems) The oil supply mechanism of the horizontal rotary compressor of the present invention divides the inside of the casing into a motor chamber and an oil reservoir chamber by a partition plate, and the discharge passage for the discharge gas compressed in the cylinder is connected to the oil supply mechanism of the horizontal rotary compressor. A gas passage is provided above the oil sump chamber, and a gas passage is provided above the partition plate, and a discharge pipe is provided in the motor chamber, and the lubricating oil stored in the oil sump chamber is supplied to the sliding part between the main shaft and the main bearing. At the same time, an oil return pipe is provided that communicates the oil sump at the bottom of the motor chamber with the low pressure side of the cylinder wall.

(Function) In the oil supply mechanism of the present invention having the above configuration, the inside of the casing is divided into the motor chamber and the oil sump chamber by the partition plate, so that the rotor of the motor in the motor chamber is not immersed into the oil sump chamber. The lubricating oil can be stored by raising the oil level so that the main shaft is immersed. The lubricating oil in this oil sump chamber is supplied to the sliding part between the main shaft and main bearing as the horizontal rotary compressor operates, and this lubricating oil also flows out from the end of the main bearing into the motor room, and the lubricating oil flows into the motor chamber from the end of the main bearing. It is stored in the oil sump at the bottom of the room. The lubricating oil stored in the oil sump at the bottom of the motor chamber is supplied into the cylinder through an oil return pipe, mixed with the discharge gas and discharged into the oil sump chamber, where it is separated from the discharge gas. . Therefore, the oil level in the oil reservoir chamber is prevented from decreasing in height and is kept substantially constant.

Therefore, good oil supply is achieved.

(Embodiment) An embodiment of the oil supply mechanism for a horizontal rotary compressor according to the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a longitudinal cross-sectional view of a horizontal rotary compressor. In the horizontal rotary compressor, a partition plate 3 is provided between the main bearing 1 and the cylinder 2, and a motor chamber 4 and an oil reservoir chamber 5 are provided between the front and rear of the cylinder 2. It is divided into two parts.

A discharge pipe 8 with a valve 7 for the discharge gas compressed in the cylinder 2 is opened above the side of the sub-bearing 6 above the oil sump chamber 5, and an oil separation element is built in above the partition plate 3. A gas passage 9 is provided. Lubricating oil is stored in the oil reservoir chamber 5 with the oil level raised so that the end of the main shaft 15 is immersed therein.

An oil return pipe 12 is provided between the oil reservoir 10 at the bottom of the motor chamber 4 and the main bearing 1, which communicates with an oil injection port 11 opened on the low pressure side of the wall of the cylinder 2.

13 is a discharge pipe provided at the 4th end of the motor chamber, 14
1 is an oil supply groove of the main shaft 15 provided in the main bearing 1, 16 is a stator, and 17 is a rotor of the motor 16.

When the main shaft 15 is rotated, the refrigerant gas is compressed by the eccentric roller 18 in the cylinder 2, and the compressed refrigerant gas is discharged through a valve 7 that opens above the side of the sub-bearing 6 above the oil sump chamber 5. This discharged gas enters the motor chamber 4 from the gas passage 9 above the partition plate 3, and enters the discharge pipe 1 at the end of the motor chamber 4.
Sent from 3.

At this time, the oil contained in the discharged gas is separated by an oil separation element provided in the gas passage 9, and between this and the oil discharged from the oil supply groove 14 of the main bearing 1,
Most of the oil whose oil level in the oil sump chamber 5 has decreased is collected in the oil sump section 10 at the bottom of the motor chamber 4.

The oil accumulated in the oil sump 10 at the bottom of the motor chamber 4 is communicated with the oil injection port 11 opened on the low pressure side of the cylinder 2 wall by the negative pressure on the low pressure side during the compression stroke by the eccentric roller 18. The oil is sucked up by the oil return pipe 12 between the oil sump 10 and the main bearing 1 and supplied into the cylinder 2, and this oil is circulated through the discharge pipe 8 into the oil sump chamber 5. A drop in the oil level in the oil reservoir 5 can be prevented, and the efficiency can be improved because oil cooled in the motor chamber 4 is injected into the high-temperature cylinder 2.

Next, the circulation effect that keeps the oil level in the oil reservoir chamber 5 constant will be explained.

When started in the state shown in Fig. 3, the lubricating oil in the oil reservoir chamber 5 is supplied to the oil supply groove 14 of the main bearing 1 by the oil amount A, and after the lubrication is completed, it reaches the motor chamber 4 (at this time, the oil amount A ). Then, the lubricating oil in the motor chamber 4 is supplied into the cylinder 2 from the oil return pipe 12 in an amount B. Next, the lubricating oil supplied into the cylinder 2 is mixed with the discharge gas and discharged into the oil reservoir chamber 5 (oil amount B at this time). A portion (oil amount C) of the lubricating oil (oil amount B) in the discharged gas is separated within the oil reservoir chamber 5 and remains within the oil reservoir chamber 5 . The remaining lubricating oil in the discharged gas is then separated in the motor chamber (oil-containing separation element) and stored in the lower part of the motor chamber (ideally, the oil amount D
=B-C).

By repeating the above circulation and setting the oil amount A to the oil amount C in this circulation action, the oil level in the oil reservoir can be kept constant.

As shown in FIG. 5, in order to ensure the timing of oil supply into the cylinder 2 and to prevent backflow, a recessed cut portion 20 is provided on the low pressure side of the blade 19, and oil is injected into this recessed cut portion 20. The outlet 11 is opened during the compression stroke of the cylinder 2,
Alternatively, as shown in FIGS. 6 and 7, if a check valve 21 or a fluid diode 22 is provided at the oil injection port 11, further effects can be obtained.

[Effects of the invention] As is clear from the description of the embodiments, according to the invention, the main shaft is immersed in lubricating oil in the oil reservoir chamber without the rotor of the motor being immersed in the lubricating oil. It is possible to raise the oil level and store it, and also to prevent the oil level from dropping in the oil reservoir.

Therefore, it is possible to stably perform good oil supply, and there is an effect that reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical front view showing a conventional horizontal rotary compressor, FIG. 2 is a vertical front view showing a horizontal rotary compressor, and FIG. 3 is a vertical front view showing an embodiment of the present invention. 4 is a vertical side view of the cylinder, FIG. 5 is a sectional view showing the second embodiment, FIG. 6 is a sectional view showing the third embodiment, and FIG. 7 is a sectional view showing the fourth embodiment. , FIG. 8 is a graph showing the timing of oil supply into the cylinder. 1... Main bearing, 2... Cylinder, 3... Partition plate, 4... Motor chamber, 5... Oil reservoir chamber, 6... Sub-bearing, 7... Valve, 8... Discharge pipe, 9... gas passage,
10...Oil sump portion, 11...Main bearing, 12...Oil return pipe, 13...Discharge pipe, 14...Oil supply groove, 1
5...Main axis.

Claims (1)

[Scope of utility model registration request] The interior of the casing is divided into a motor chamber and an oil reservoir chamber by a partition plate, a discharge passage for the discharge gas compressed in the cylinder is opened above the oil reservoir chamber, and a gas passage is provided above the partition plate, and the motor A discharge pipe is provided in the chamber, and the lubricating oil stored in the oil reservoir chamber is supplied to the sliding part between the main shaft and the main bearing, and
An oil supply mechanism for a horizontal rotary compressor, characterized in that an oil return pipe is provided that communicates an oil sump at the bottom of the motor chamber with a low pressure side of the cylinder wall.