JPH0357319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement of a rotary compressor in which a vessel-shaped muffler body is attached to a frame body.

(b) Prior Art A conventional rotary compressor is constructed as shown in, for example, Japanese Patent Application Laid-Open No. 60-98192. Here, a conventional example will be explained with reference to this publication. In FIGS. 6 to 8, 50 is a rotary compressor, 51 is a closed container, and 52 is a stator, which is fixed to the closed container 51 by shrinkage fitting. 53 is a rotor, and a rotating shaft 54
is connected to. 55 is a roller, and 56 is a cylinder. 57 is a bearing on the rotor 53 side, which is welded to the closed container 51. Reference numeral 58 denotes a bearing at the end of the rotating shaft 54, and a recess 61 for mounting a cantilevered discharge valve 60 is provided on the opposite cylinder surface 59. 62
is a discharge hole provided in the recess 61. 63 is a partition plate interposed between the bearing 58 and the vessel-shaped muffler body 64. A hole 65 is formed in this partition plate near the discharge hole 62 on the free end side of the discharge valve 60 to communicate the recess 61 with the inside of the muffler body 64 .

In the rotary compressor of this structure, the refrigerant compressed in the cylinder 56 is discharged from the discharge hole 62 into the recess 61 by opening the discharge valve 60, and is discharged from the muffler body through the hole 65 provided in the partition plate 63 near the discharge hole. The passage of the refrigerant flowing from the discharge hole 62 into the muffler body 644 through the recess 61 is shortened to reduce pressure loss.

(c) Problems to be solved by the invention However, the holes 65 of the partition plate 63 are
Since it is provided on the free end side of the discharge valve 60 near the cylinder 56, the pulsation of the refrigerant compressed within the cylinder 56 can be reduced and the noise reduction effect can be enhanced.
This increases the discharge resistance of the refrigerant gas flow exiting the discharge hole, causing a problem in that the opening/closing operation of the discharge valve becomes worse and the refrigerating capacity is impaired.

In order to solve the above problem, this invention creates a negative pressure part in the discharge valve with the refrigerant flowing through the hole in the partition plate, and increases the opening degree of this discharge valve to reduce the pressure loss of the refrigerant at the discharge hole. The purpose is to make it smaller.

(d) Means for Solving the Problems This invention provides a hole smaller than the diameter of the discharge hole in the partition plate interposed between the muffler body and the frame, on the side opposite to the cylinder of the discharge valve device. It is provided at a position that is included in the projection plane.

(E) Effect With the above configuration, this invention not only reduces the pulsation of the refrigerant discharged from the discharge hole through the throttling action of the holes in the partition plate, thereby improving the silencing effect, but also directs the refrigerant to the hole in the partition plate after leaving the discharge hole. The refrigerant flow can form a negative pressure part in the discharge valve device, especially in the upper space of the discharge valve, and the opening degree of the discharge valve can be increased so that the discharge valve is sucked toward the valve presser side. Therefore, the refrigeration capacity can be improved.

(F) Embodiments The present invention will be described below based on embodiments shown in FIGS. 1 to 5.

Reference numeral 1 denotes a closed container, in which an electric element 2 is housed on the upper side, and a rotary compression element 3 is housed on the lower side. The electric element 2 includes a stator 4 that is shrink-fitted to the inner wall of the sealed container 1, and a rotor 7 that is inserted into the rotating shaft 6 through an air gap 5 inside the stator.
It is composed of. The rotary compression element 3 includes a cylinder 8, a roller 10 that is rotated within the cylinder 8 by an eccentric portion 9 of the rotating shaft 6, and a vane 11 that is in contact with the roller and divides the inside of the cylinder 8 into a high pressure chamber and a low pressure chamber. It is comprised of an upper frame 12 and a lower frame 13 that close the opening of the cylinder 8. Reference numeral 14 denotes a discharge valve device that opens and closes the discharge hole 15, and this discharge valve device is formed of a discharge valve 16 and a valve holder 17 that regulates the opening degree of the discharge valve. Reference numeral 18 denotes a recess formed on the opposite cylinder surface of the upper frame 12 for mounting the discharge valve device 14. 19
The muffler body is a bowl-shaped muffler body, and this muffler body is fitted and attached to the upper frame body 12. 20
is a disk-shaped partition plate interposed between the upper frame body 12 and the muffler body 19, and this partition plate partitions the interior of the muffler body 19 and the recessed portion 18 to form a muffling chamber in each. 21 is the inside of the muffler body 19 and the recess 1
This hole is formed in the partition plate 20 that communicates with the muffler body 19 at the center of the discharge hole 15 and in the bulged portion 22 that bulges toward the muffler body 19 side.
Reference numeral 23 denotes a positioning recess provided on the opposite cylinder surface of the upper frame 12 so as to face the recess 18 across the center. Reference numeral 24 denotes a protrusion formed on the partition plate 20 to protrude toward the upper frame body 12, and this protrusion is housed in the positioning recess 23 to prevent the partition plate 20 and the upper frame body 12 from being misaligned. . Reference numeral 23 denotes a guide straight part provided at one location on the outer circumference of the partition plate 20. This straight part serves as a guide when passing through the automatic feeder, and the partition plate 20 rotates to adjust its attachment position to the upper frame 12. prevents it from shifting. Reference numeral 26 denotes a connecting hole drilled in the cylinder 8, and this connecting hole communicates with the inside of the muffler body 19 via a passage hole 27 in the upper frame 12 and a small hole 28 in the partition plate 20. The small hole 28 is formed to have a smaller passage area than the passage hole 27 of the upper frame 12. 29 is a heat exchanger provided outside the closed container 1, and this heat exchanger has one end connected to the communication hole 26 and the other end connected to the electric element 2 and the rotary compression element 3.
and are respectively connected to a space 30 between them. Reference numeral 31 denotes a discharge pipe attached to the closed container 1, and this discharge pipe communicates with the upper space 32 of the electric element 2.

In the rotary compressor configured as described above, the refrigerant flowing into the cylinder 8 is compressed by the cooperation of the roller 10 and the vane 11, and is discharged from the discharge hole 15 into the recess 18 by opening the discharge valve 16. When the discharged refrigerant passes through the hole 21 of the partition plate 20, the concave portion is throttled and discharged into the muffler body 19 with a discharge pulsation component reduced. When the refrigerant discharged into the muffler body passes through the small hole 28 of the partition plate 20, it is throttled again to further reduce discharge pulsation, and passes through the passage hole 27 of the upper frame 12 to the communication hole 26 of the cylinder 8.
and flows into the heat exchanger 29. This heat exchanger is prevented from vibrating due to pulsation of the refrigerant. The refrigerant cooled by the heat exchanger 29 flows into the space 30
When passing through the air gap 5 of the electric element 2, it cools the electric element and flows into the upper space 32. The refrigerant flowing into this upper space is discharged from the discharge pipe 31 to the outside of the closed container 1.

The hole 21 of the partition plate 20 is located above the discharge valve 16 and the valve holder 17 that constitute the discharge valve device 14.
Because the refrigerant is formed at a position that is included in the projection plane of
A negative pressure section can be formed in the space between the discharge valve 16 and the valve holder (17), and the discharge valve 16 can be sucked toward the valve holder 17 (in the opening direction) by this negative pressure section. Thereby, the discharge valve 16 can be quickly opened to a large degree, and the pressure loss of the refrigerant flow discharged from the discharge hole 15 can be reduced and the refrigerating capacity can be improved. Further, by providing the bulging portion 22 on the partition plate 20 and providing the hole 21 in this bulging portion, it is possible to secure a wide gap between the tip of the valve holder and the partition plate 20, and the discharge hole 15 By ensuring a sufficient passage area for the refrigerant to reach the hole 21, it is possible to prevent the formation of a negative pressure section in areas other than the upper space of the discharge valve 16, thereby achieving the above-mentioned suction effect favorably.

(G) Effects of the Invention As described above, according to the present invention, the pulsation of the refrigerant discharged from the discharge hole is reduced and the noise reduction effect is enhanced, while
It is possible to reduce the pressure loss of the refrigerant flow by ensuring a large opening degree of the discharge valve, and it is possible to provide a compressor with low noise and excellent refrigerating capacity.

[Brief explanation of drawings]

1 to 5 show the present invention, FIG. 1 is a longitudinal sectional view of the rotary compressor, FIG. 2 is an exploded perspective view showing the discharge muffler section, and FIG. 3 is an enlarged cross-sectional view of the main part of the discharge valve device. 4 is a plan view of the partition plate, FIG. 5 is a sectional view taken along the line V-V in FIG. 4, FIGS. 6 to 8 show conventional examples, and FIG. Figure, 7th
The figure is an exploded perspective view showing the discharge muffler section, and FIG. 8 is a plan view of the bearing. 8... Cylinder, 12... Upper frame, 13...
Lower frame body, 14...Discharge valve device, 15...Discharge hole, 19...Muffler body, 20...Partition plate, 21
...hole.

Claims (1)

[Claims] 1 A frame that closes the opening of the cylinder, a discharge valve device mounted on the frame to open and close a discharge hole provided in the frame, and a discharge valve device mounted on the frame so as to cover the discharge valve device. A device comprising a container-shaped muffler body and a partition plate interposed between the muffler body and the frame body, wherein the partition plate has a hole smaller in diameter than the discharge hole. A rotary compressor, characterized in that the rotary compressor is formed at a position that is included in the projection plane of the discharge hole on the opposite cylinder side of the rotary compressor.