JPS6211356Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a rotary compressor, in particular, a compression element housed in a casing, which has a discharge port provided at least in the rear head, and a discharge port disposed in the rear head in oil stored at the bottom of the casing. This rotary compressor is equipped with a muffler to discharge gas into a casing through the muffler, and is provided with an oil pickup at the lower end of the drive shaft to supply the oil to lubricated parts.

Conventionally, as a rotary compressor, for example, the Jikosho
54-35845, and as shown in FIG. 2, a cylinder C having a roller L inside is provided between the front head F and the rear head R, and this roller L is eccentrically rotated by a drive shaft D. In order to compress the gas sucked into the cylinder C, a discharge muffler M is connected to the rear head R.
It is known that the gas compressed in the cylinder C and discharged from the discharge port O provided in the rear head R is discharged into the casing A through the muffler M.

However, in this type of compressor, an oil pick-up P is provided at the lower end of the drive shaft D, and the oil at the bottom of the casing A is pumped up by the rotation of the oil pick-up P accompanying the drive shaft D.
The lubricating portion of the drive shaft D is supplied with oil through an oil passage formed within the drive shaft D.

By the way, in the compressor, the muffler M
Because the gas inside is under high pressure, gas leaks from the gap S between the muffler M and the rear head R and mixes with the oil, and this gas is pumped up together with the oil by the oil pickup P. Amount of oil pumped by oil pick-up P,
That is, the amount of oil supplied to the lubricated parts was reduced, resulting in a problem that the lubricating function was impaired.

The present invention was devised in view of the above problems, and by guiding the gas leaking from between the rear head and the muffler upward into the casing, the gas is prevented from being pumped up together with the oil by the oil pickup. The purpose is to prevent oil shortages in lubricated parts by pumping up only oil from this oil pickup.

More specifically, the discharge muffler is provided with a ring-shaped gas guide piece that extends from the outer periphery of the rear head toward the inner wall of the casing and is disposed in the oil. This is to prevent gas from being pumped into the oil pickup along with oil.

The rotary compressor according to the present invention will be explained below with reference to the embodiment shown in FIG.

Reference numeral 1 in FIG. 1 denotes a casing, which is formed in a sealed manner by fitting upper and lower lids 12, 12 onto both open ends of a cylindrical casing body 11. A motor 2 and a compression element 3 are installed inside.

The motor 2 includes a stator 21 fixed to the inner wall surface of the casing 1 and a rotor 22 rotating within the stator 21.
3 are combined together.

The compression element 3 is connected to a casing 31 and a front head 3 fixed to the upper and lower positions of the cylinder 31.
The extension part of the drive shaft 23 is inserted into each head 32, 33 and supported by the bearing metals 24, 25, and the part of the drive shaft 23 corresponding to the cylinder 31 is By eccentrically fitting a roller 34 to the eccentric shaft portion 23a and eccentrically rotating the roller 34 within the cylinder 31 along with the drive shaft 23, the gas suction provided on one side of the cylinder 31 is rotated eccentrically. Gas is sucked into the cylinder 31 from the passage 35 and is compressed.

The front head 32 and the rear head 33 are provided with a discharge muffler 3 that forms a gas discharge passage 36 between the front head 32 and the rear head 33, respectively.
7, 37, and each head 32,
33 are formed with gas discharge ports 38, 38 that communicate with the inside of the cylinder 31 and open to the respective discharge passages 36 of the mufflers 37, 37, and the gas compressed within the cylinder 31 is discharged from the respective discharge ports 38, 33. 38 into the casing 1 via discharge passages 36, 36 in the mufflers 37, 37.

Furthermore, a casing 1 is attached to the lower end of the drive shaft 23.
An oil pick-up 4 which is open to the bottom of the casing 1 is attached, and by rotation of the oil pick-up 4 along with the drive shaft 23, the oil stored at the bottom of the casing 1 is pumped up to create an oil passage formed inside the drive shaft 23. Lubricating parts of the drive shaft 23, for example, between the drive shaft 23 and the bearing metals 24 and 25, and between the eccentric shaft portion 23a of the drive shaft 23 and the roller 34, etc. are supplied with oil through the shaft 23b.

The discharge muffler 37 attached to the rear head 33 is provided with a ring-shaped gas guiding piece 37a extending from the outer periphery of the rear head 33 toward the inner wall of the casing 1 and disposed in the oil. Accordingly, the rear head 33
The exhaust gas leaking from the space S between the and muffler 37 is guided upward and prevented from reaching downward, thereby preventing the oil pickup 4 from pumping up the gas together with the oil. It is.

The guide piece 37a is formed integrally with the muffler 37 by extending the outer circumference of the muffler 37 in the outer circumferential direction, or the guide piece 37a is formed separately from the muffler 37, as shown in the embodiment of the figure. Then, the guide piece 37a is attached to the outer periphery of the muffler 37.

Further, the guide piece 37a has a size that accounts for 75 to 80% of the internal cross-sectional area of the casing 1. Specifically, when the inner diameter of the casing 1 is 160 mm, the outermost circumferential diameter of the guide piece 37a 140~
150 mm, and a gap X of an appropriate size is formed between the inner wall of the casing 1 and the guide piece 37a to prevent gas leaking from between the rear head 33 and the muffler 37 from oil. It is possible to prevent the oil from reaching the pick-up 4, and to smoothly return the oil discharged together with the discharge gas to the bottom of the casing from the gap X between the casing 1 and the guide piece 37a.

In the above embodiment, the gas discharge passage 36 was formed on both the outer surfaces of the front head 32 and the rear head 33 via the muffler 37, but in the present invention, the discharge passage 36 was formed only on the rear head 33 via the muffler 37. It can also be applied to things.

In FIG. 1, 5 is a suction pipe attached to the suction passage 35 of the cylinder 31 from the outside of the casing 1, and 6 is a discharge pipe provided at the upper part of the casing 1. It is intended to be compressed within the cylinder 31 and discharged into the casing 1, and then discharged from within the casing 1 to the outside via the discharge pipe 6.

Reference numeral 7 in FIG. 1 indicates a discharge valve provided at each discharge port 38 of the front head 32 and rear head 33.

The present invention is constructed as described above, and the cylinder 3 is rotated by the rotation of the drive shaft 23 accompanying the motor 2.
1, the roller 34 is eccentrically rotated to compress the gas sucked into the cylinder 31, and this compressed gas flows from each discharge port 38 of the front head 32 and rear head 33 to the discharge passage 36 in the muffler 37. It is discharged into the casing 1 through the discharge pipe 6 of the casing 1 and discharged to the outside.

During the gas compression process, a portion of the discharged gas leaks out from between the rear head 33 and the muffler 37. However, the muffler 37 has a cylinder extending in the outer circumferential direction and disposed in the oil. Since the gas guide piece 37a is provided, the gas guide piece 3
7a guides the leaked gas upward and prevents it from reaching downward. Therefore, the oil pickup 4 provided at the lower end of the drive shaft 23 does not pump up the gas together with the oil. Oil Pickup 4 pumps only oil,
A sufficient amount of oil can be supplied to the lubricated portion from the oil passage 23b of the drive shaft 23.

As explained above, in the rotary compressor of the present invention, the discharge muffler attached to the rear head is provided with a ring-shaped gas guide piece that extends from the outer periphery of the rear head toward the inner wall of the casing and is disposed in the oil. The gas leaking from between the rear head and the muffler is guided upward by the guide piece, and can be reliably prevented from reaching the oil pickup at the bottom of the casing. Pumping up only the oil without pumping up the oil,
A sufficient amount of oil can be supplied to the lubricated parts, and seizing accidents of the lubricated parts can be prevented.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a rotary compressor according to the present invention, and FIG. 2 is a schematic vertical cross-sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Casing, 23... Drive shaft, 3... Compression element, 33... Rear head, 37... Discharge muffler, 37a... Gas guide piece, 38... Discharge port.

Claims (1)

[Scope of utility model registration request] A discharge port is provided in at least the rear head of the compression element installed in the casing, and a discharge muffler disposed in the oil stored at the bottom of the casing is attached to the rear head, so that the discharge gas is discharged into the casing through the muffler. In the rotary compressor, an oil pickup is provided at the lower end of the drive shaft, and the oil is supplied to the lubricating parts, and the discharge muffler is provided with an oil pickup extending from the outer periphery of the rear head toward the inner wall of the casing; A rotary compressor characterized by having a ring-shaped gas guide piece placed in oil.