JPH0330629Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a hermetic compressor with a discharge muffler attached to the upper bearing.

(b) Conventional technology A conventional hermetic compressor is, for example, the Utility Model Publication No. 57-139687.
The structure is as shown in the publication. Here, a conventional example will be explained with reference to this publication. Fourth
In the figure, reference numeral 1 denotes a closed container, and an electric element 3 and a compression element 4 connected by a rotating shaft 2 are housed in this closed container. 5 is a cylinder, and an upper bearing part 6 and a lower bearing part 7 are attached to both ends of the cylinder. A roller 9 is rotatably provided on the outer periphery of the eccentric portion 8 of the rotating shaft 2, and a narrow groove (not shown) is provided in the cylinder 5, and a vane is slidably installed in the narrow groove. (not shown) is stored. 10 is a cylinder 5, upper and lower bearing parts 6,
7, a compression chamber defined by rollers 9; Oil grooves 11 and 12 are provided in the upper and lower journal parts of the rotating shaft 2, and oil grooves 11 and 12 are provided in the upper and lower journal parts of the rotating shaft 2 and the upper and lower bearing parts 6 and 7.
Supply oil in between for lubrication. 13 is a discharge muffler, and this discharge muffler is attached so as to cover a discharge valve 14 provided in the upper bearing portion 6. Reference numeral 15 indicates a blowout hole bored in the upper surface of the discharge muffler 13. 16 is a discharge pipe provided on the upper wall of the closed container 1.

In a hermetic compressor with this structure, the discharge muffler 13
is attached to the upper bearing part 6, and the refrigerant compressed in the cylinder 5 is discharged into the closed container 1 from a blow-off hole 15 formed in the upper surface of the discharge muffler 13 so as not to cause a pressure drop.

(c) Problems to be solved by the invention However, the oil that lubricates the upper journal part through the oil groove 11 and flows down from the upper end onto the upper surface of the discharge muffler 13 flows out from the blow-off hole 15 in the axial direction through the high-pressure discharge. There was a problem that the oil that was blown up by the gas and discharged from the discharge pipe 16 through the gap between the electric elements 3 together with the discharged gas, and that the oil stored in the closed container 1 ran out.

In order to solve the above problem, this invention aims to guide the oil that flows down the top surface of the discharge muffler into a concave groove, thereby reducing the amount of oil blown up by the high-pressure discharge gas discharged from the blow-off hole. It is something.

(d) Means for solving the problem This idea provides an upward opening in the discharge muffler, and forms grooves near both sides of this opening, and
These grooves are arranged in parallel in the circumferential direction of the discharge muffler.

(e) Effect This invention provides an upward opening in the discharge muffler, and forms grooves near both sides of this opening, and
By arranging these grooves in the circumferential direction of the discharge muffler, the oil flowing down from the upper end of the journal part to the upper surface of the discharge muffler is guided to the grooves while lubricating the journal part, and high pressure is discharged from the opening. The amount of oil blown up by the refrigerant gas is reduced, and the amount of oil discharged to the outside from the discharge pipe is reduced.

(f) Embodiment This invention will be explained below based on the embodiment shown in FIGS. 1 to 3.

Reference numeral 20 denotes a closed container, in which an electric element 21 is housed in the upper part and a rotary compression element 22 is housed in the lower part. The rotary compression element 22 includes two cylinders 23 and 24, an intermediate partition plate 25 that is sandwiched between the cylinders and partitions them, and eccentric parts 27 and 28 of a rotating shaft 26 whose rotation angles are shifted by 180 degrees.
rollers 29 and 30 that rotate within the cylinders 3 and 24, vanes 31 and 32 that come into contact with the rollers and divide the insides of the cylinders 23 and 24 into high-pressure areas and low-pressure areas, and vanes that close the openings of the cylinders 23 and 24. Bearing part 3
3 and a lower bearing part 34, discharge valves 35 and 36 provided on the upper and lower bearing parts, respectively, and an upper discharge muffler 37 and a lower discharge muffler 38 that cover the discharge valves. 39 is a communication hole that communicates the inside of the upper discharge muffler 37 and the inside of the lower discharge muffler 38;
This communication hole connects the cylinders 23, 24 and the intermediate partition plate 2.
5. Upper and lower bearing parts 3
Oil grooves 40 and 41 are provided in the journal portions 3 and 34. Reference numeral 42 denotes three openings formed in the upper surface of the upper discharge muffler 37 along the circumferential direction, and a plurality of grooves 43 are formed radially between the openings. Grooves 4 located on both sides of the opening 42
3 and 43 are provided close to this opening, respectively. 44 is a discharge pipe provided on the upper wall of the closed container 20.

In the hermetic compressor configured in this way,
The refrigerant that has flowed into the cylinders 23 and 24 of the rotary compression element 22 is transferred to the eccentric parts 27 and 2 whose rotation angles are shifted by 180°.
It is compressed by the cooperation of the rollers 29, 30 rotated by the rollers 8 and the vanes 31, 32 that slide in contact with these rollers. Each cylinder 23, 2
The refrigerant compressed in the muffler 4 is discharged into the upper and lower discharge mufflers 37 and 38 by opening the discharge valves 35 and 36. The refrigerant discharged into the upper discharge muffler 37 is discharged into the closed container 20 from the opening 42. Further, the refrigerant discharged into the lower discharge muffler 38 passes through the communication hole 39, flows into the upper discharge muffler 37, and is discharged from the opening 42 into the closed container 20.

The oil that has lubricated the journal portion of the upper bearing portion 33 flows down from the upper end of the upper bearing portion to the upper surface of the upper discharge muffler 37. The oil that has fallen onto the upper surface of the upper discharge muffler flows into grooves 43 formed between the openings 42, so that the amount of oil that is drawn in by the refrigerant flow blown up from these openings is reduced. Moreover, the oil that has flowed into the grooves 43 is made to flow down to the bottom of the closed container 20 without being affected by the refrigerant flow from the openings 42.

Furthermore, the grooves 43 reinforce the strength of the upper discharge muffler 37 and reduce vibration of the upper discharge muffler due to the refrigerant flow.

(g) Effects of the invention The hermetic compressor of this invention has an upward opening in the discharge muffler, grooves are formed near both sides of this opening, and these grooves are arranged in a line in the circumferential direction of the discharge muffler. Therefore, the oil discharged from the upper end of the journal part of the upper bearing part and flowing down onto the upper surface of the discharge muffler is guided to the concave groove to reduce the amount of oil blown up by the refrigerant flow discharged from the opening. The oil accumulated in the groove is prevented from being blown up again by the refrigerant flow from the opening, and the groove reinforces the strength of the discharge muffler, reducing the vibration of the discharge muffler caused by the refrigerant flow. It has a certain effect.

[Brief explanation of the drawing]

Figures 1 to 3 show this invention; Figure 1 is a longitudinal sectional view of the rotary compressor, Figure 2 is a plan view of the discharge muffler, Figure 3 is a sectional view taken along the line -' in Figure 2, and Figure 3 is a cross-sectional view of the rotary compressor. FIG. 4 is a longitudinal sectional view showing a conventional rotary compressor. 20... Airtight container, 22... Rotating compression element, 3
3... Upper bearing part, 37... Upper discharge muffler, 42
...opening, 43...concave groove.

Claims (1)

[Scope of utility model registration request] In a hermetic compressor in which a discharge muffler is attached to an upper bearing portion of a compression element housed in a hermetically sealed container, the discharge muffler is provided with an upward opening, grooves are formed near both sides of this opening, and grooves are formed in the vicinity of both sides of the opening. A hermetic compressor characterized by grooves arranged in the circumferential direction of the discharge muffler.