JP2527290Y2 - Compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor such as a closed scroll electric compressor.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional compressor of this kind. Inside the closed housing 8, a scroll type compression mechanism C is provided at an upper portion thereof, and an electric motor 4 is provided at a lower portion thereof. These components are linked to each other via a rotary shaft 5. The scroll type compression mechanism C permits the revolving orbiting motion of the fixed scroll 1, the orbiting scroll 2 and the orbiting scroll 2, but a rotation preventing mechanism 3 such as an Oldham link for preventing the rotation, the fixed scroll 1 and the electric motor 4.
, An upper bearing 71 and a lower bearing 72 that support the rotary shaft 5, a orbiting bearing 73 and a thrust bearing 74 that support the orbiting scroll 2, and the like.

The fixed scroll 1 has an end plate 11 and a spiral wrap 12 erected on its inner surface. The end plate 11 is provided with a discharge port 13 and a check valve 17 for opening and closing the discharge port 13. . The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21. A drive bush 54 is rotated via a slewing bearing 73 in a boss 23 erected on the outer surface of the end plate 21. An eccentric pin 53 protruding from the upper end of the rotary shaft 5 is slidably fitted into a slide hole 55 formed in the drive bush 54 so as to be freely fitted. A balance weight 84 is attached to the drive bush 54.

A plurality of compression chambers 24 are formed by eccentrically interlocking the fixed scroll 1 and the orbiting scroll 2 with each other by a predetermined distance and shifting the angle by 180 °.

When the electric motor 4 is driven, the rotary shaft 5, the eccentric pin 53, the drive bush 54, the boss 23
The orbiting scroll 2 is driven via the orbit, and the orbiting scroll 2 revolves in a circular orbit having a revolving orbital radius while being prevented from rotating by the rotation preventing mechanism 3. Then, the gas enters the housing 8 through the suction pipe 82 and cools the electric motor 4, and is then sucked into the compression chamber 24 through the suction passage 15. Then, as the volume of the compression chamber 24 decreases due to the revolving orbiting motion of the orbiting scroll 2, the compression chamber 24 is compressed and reaches the center portion while being compressed, pushes the check valve 17 from the discharge port 13 and enters the first discharge cavity 14. , And partition plate 25
Through the communication hole 18 formed in the second discharge cavity 19, and then discharged to the outside through the discharge pipe 83.

At the same time, the lubricating oil stored in the oil sump 81 at the bottom of the housing 8 is sucked up by the centrifugal pump 51, passes through the oil supply hole 52 formed in the rotary shaft 5, and the lower bearing 72 and the eccentric pin 53. After lubricating sliding portions such as the upper bearing 71, the rotation preventing mechanism 3, the turning bearing 73, and the thrust bearing 74, the lubricating oil returns to the oil sump 81 via the chamber 61 and the oil drain hole 62 and is stored there.

[0007]

In the conventional compressor described above, when the compressed gas is discharged from the discharge port 13 to the first discharge cavity 14 via the check valve 17, the first discharge cavity 14 The resonance of the natural frequency determined by the shape and volume of the gas and the pulsation of the discharge gas may generate noise composed of high-frequency pulsation noise.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems, and the gist of the present invention is to connect a first discharge cavity in which a discharge port opens to a first discharge cavity through a communication hole. In a compressor provided with a continuous second discharge cavity, a check valve is provided only in a communication hole between the first discharge cavity and the second discharge cavity.

[0009]

In the present invention, the natural frequency of the closed space formed by the second discharge cavity and the pulsation of the discharge gas are no longer caused by the check valve closing the communication hole because of the provision of the above structure. It does not resonate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG. A check valve for opening and closing the discharge port 13 is removed, and a check valve 30 for opening and closing the communication hole 18 is attached to the partition wall 25 instead. Other components are the same as those of the conventional device shown in FIG. 2, and corresponding members are denoted by the same reference numerals. During the operation of the compressor, the gas compressed in the compression chamber 24 is discharged to the first discharge cavity 14 through the discharge port 13 and then to the second discharge cavity 19 through the communication hole 18.
The natural frequency determined by the shape and volume of the closed space formed by the second discharge cavity 19 by closing the communication hole 18 with the check valve 30 is formed by the first discharge cavity 14. Is different from that of a closed space
Therefore, the natural frequency of the second discharge cavity 19 and the pulsation of the discharge gas do not resonate with each other to generate noise.

[0011]

According to the present invention, since the check valve is provided only in the communication hole between the first discharge cavity and the second discharge cavity, the check valve closes the communication hole so that the second discharge cavity is closed. The resonance of the natural frequency of the closed space formed by the above and the pulsation of the discharge gas no longer occurs. Thus, despite the extremely simple and inexpensive configuration, noise composed of high-frequency pulsation noise can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional compressor.

[Explanation of symbols]

 13 Discharge port 14 First discharge cavity 18 Communication hole 19 Second discharge cavity 30 Check valve

Claims (1)

(57) [Scope of request for utility model registration] 1. A compressor in which a second discharge cavity connected to a first discharge cavity with a discharge port opened through a communication hole is provided, the communication between the first discharge cavity and the second discharge cavity. A compressor characterized in that a check valve is installed only in a hole.