JPH0726633B2 - Silencer for rotary compressor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary compressor, and more particularly to a compressor that reduces noise due to pressure pulsation generated in a cylinder.

(B) Conventional Technology A conventional rotary compressor is constructed as shown, for example, in Japanese Utility Model Laid-Open No. 60-32585. Here, a conventional example will be described with reference to this publication. In FIGS. 6 to 8, 50
Is an airtight container in which the electric element 51 is housed on the upper side and the rotary compression element 52 is housed on the lower side. The rotary compression element 52 includes a cylinder 53, a roller 56 that rotates in the cylinder 53 by an eccentric portion 55 of a rotary shaft 54, and a vane 59 that is in contact with the roller 56 and divides the cylinder 53 into a high pressure chamber 57 and a low pressure chamber 58. It is composed of an upper bearing portion 60 and a lower bearing portion 61 that seal the opening of the cylinder 53. 62 is a suction port, which is provided on the side wall of the cylinder 53. 63 is a discharge port, and this discharge port is provided in the lower bearing portion 61. A discharge valve 64 is arranged on the outlet side of the discharge port 63. A discharge muffler body 65 covers the surface of the lower bearing portion 61, and a discharge muffler chamber 66 is formed therein. 67 is the upper bearing 60
This is a small space provided on the surface side that contacts the cylinder 53, and this small space communicates with the inside of the cylinder 53 via the introduction path 68. Moreover, the introduction path 68 is 180 ° to 2 degrees with the vane 59 as the base point.
It is provided within a rotation angle of 50 °.

In the rotary compressor of this structure, the small space 67 communicating with the cylinder 53 via the introduction path 68 attenuates the pressure pulsation generated when sucking and compressing the fluid in this cylinder, and the rotary compressor is pressure pulsated. I try not to cause vibration.

(C) Problems to be Solved by the Invention However, the introduction path 68 is 180 ° from the vane 59 as a base point.
Since it is opened in the cylinder 53 in the rotation angle range of ~ 250 °, the high pressure fluid in the latter half of the compression stroke remains in the small space 67, and the high pressure fluid in the small space 67 remains in the cylinder 53 in the suction stroke. Backflow to raise the pressure of the low pressure chamber 58 in this cylinder,
There is a problem that it becomes difficult for the fluid to flow into the cylinder 53 from the suction port 62, and the refrigerating capacity is reduced.

The present invention solves the above problems, and an object of the present invention is to provide a muffler for a rotary compressor in which the refrigerating capacity is not deteriorated by the fluid remaining in the small space that attenuates the pressure pulsation generated in the cylinder. It is what

(D) Means for Solving the Problem The present invention accommodates an electric element having a rotary shaft and a rotary compression element driven by the rotary shaft of the electric element in a closed container, and the compression element is a cylinder. An eccentric part of the rotary shaft, a roller that rotates in the cylinder by the eccentric part, a vane that contacts the roller and divides the cylinder into a low-pressure chamber and a high-pressure chamber, and a bearing part that seals the opening of the cylinder. And a discharge port communicating with the high pressure chamber and a discharge valve for opening and closing the discharge port are provided in the bearing portion, and
In a rotary compressor in which a suction port communicating with the low pressure chamber is provided in the cylinder and the fluid compressed in the cylinder is discharged from the discharge port into the closed container, a space opened in the cylinder at the cylinder or bearing. Is provided
The rotation angle of this space from the intake port is based on the vane.
The cylinder is opened up to 180 °.

(E) Action With the configuration of the present invention as described above, the space for damping the pressure pulsation generated in the fluid compressed in the cylinder is opened in the cylinder in the first half of the compression stroke and remains in the space. Even if the fluid flows back into the cylinder during the suction stroke, the rise of the low pressure is suppressed so that the low temperature fluid does not easily flow into this cylinder.

(F) Embodiments The present invention will be described below with reference to embodiments shown in FIGS. 1 to 3.

Reference numeral 1 denotes a closed container in which an electric element 3 having a rotary shaft 2 on the upper side and a rotary compression element 4 driven by the rotary shaft 2 of the electric element are accommodated on the lower side. The rotary compression element 4 includes a cylinder 5, an eccentric portion 6 of the rotary shaft 2,
A roller 7 fitted in the eccentric portion to rotate in the cylinder 5, a vane 10 contacting the roller 5 to divide the cylinder 5 into a low pressure chamber 8 and a high pressure chamber 9, and an upper bearing portion for sealing the opening of the cylinder 5. 11 and the lower bearing portion 12, and a discharge muffler body 13 attached so as to cover the surface of the upper bearing portion. The upper bearing portion 11 is provided with a discharge port 15 that connects the high pressure chamber 9 of the cylinder 5 and the discharge muffler chamber 14 formed inside the discharge muffler body 13. A discharge valve 16 for opening and closing the discharge port 15 is attached to the upper bearing portion 11 on the outlet side of the discharge port. Reference numeral 17 is a suction port formed in the cylinder 5, and this suction port communicates with the low pressure chamber 8. A discharge pipe 18 is attached to the upper wall of the closed container 1.

Reference numeral 19 denotes a small space provided in the cylinder 5. This small space is formed by forming a recess in the end surface of the cylinder 5 on the side of the upper bearing portion 11 side, and 180 ° from the suction port 17 from the vane 10 as a base point.
It is opened in the cylinder 5 in the range of the rotation angle.

In the muffler of the rotary compressor configured as described above,
The fluid flowing into the cylinder 5 from the suction port 17 is compressed by the cooperation of the roller 7 and the vane 10, and the fluid is discharged from the discharge port 15
Open the discharge valve 16 from the discharge muffler chamber of the discharge muffler body 13
It is discharged to 14. Then, the fluid in the discharge muffler body is discharged from the discharge pipe 18 to the external cooling circuit (not shown) through the closed container 1.

The small space 19 provided in the cylinder 5 is opened in the cylinder 5 in the middle of compression, so that the pressure pulsating component of the fluid in the compression stroke is absorbed and attenuated, and the discharge port 15 discharges the muffler chamber 14
The level of the pressure wave of the fluid discharged to is reduced. Moreover, since the small space 19 is opened from the suction port 17 into the cylinder 5 in the range of the rotation angle of 180 ° with the vane 10 as the base point, the fluid having a relatively low pressure in the first half of the compression stroke remains in the small space 19. However, the substantial amount of fluid that flows back from the small space 19 into the low pressure chamber 8 in the suction stroke is reduced. for that reason,
The fluid in the low-pressure chamber 8 in the cylinder 5 in the suction stroke is a fluid that flows backward from the small space 19 and hardly increases in pressure, so that the fluid does not easily flow into the cylinder 5 through the suction port 17.

Further, the small space 19 has a volume extremely smaller than the effective volume of the high pressure chamber 9 in the cylinder 5, so that the reduction of the refrigerating capacity of the compressor can be suppressed.

Therefore, according to the present invention, by providing the small space 19 communicating with the cylinder 5 in the first half of the compression stroke, the pressure pulsation is absorbed, noise generated outside is reduced, and the refrigerating capacity of the fluid remaining in the small space 19 is reduced. It is designed to prevent the decrease.

In the above description, the small space 19 is provided on the end surface of the cylinder 5 on the upper bearing portion 11 side, but as shown in FIG. 4, a small space 20 is formed by making a hole in the center of the cylinder 5. Needless to say, the small space 21 may be formed by notching the contact surface of the upper bearing portion 11 that contacts the cylinder 5 as shown in FIG. Further, it goes without saying that the small space may have any shape and position as long as it communicates with the cylinder in the first half of the compression stroke.

(G) Effect of the Invention As described above, according to the present invention, a small space that damps the pressure pulsation during the compression stroke in the cylinder is opened from the suction port into the cylinder at a rotation angle of 180 ° with the vane as the base point. Since it is provided in the small space, the pressure of the fluid remaining in the small space can be reduced to prevent the refrigeration capacity from decreasing, and the pressure of the low pressure chamber in the suction stroke due to the fluid remaining in the small space can be prevented from rising. However, the fluid flowing from the suction port into the low-pressure chamber is blocked, and the insufficient supply of low-temperature fluid can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary compressor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is an enlarged sectional view showing an essential part of a space provided in a cylinder. Figure, 4th
FIG. 6 is an enlarged cross-sectional view of a main part of a space provided in a cylinder showing another embodiment, FIG. 5 is an enlarged cross-sectional view of a main part of a space provided in a cylinder showing another embodiment, and FIG. FIG. 7 is a longitudinal sectional view of the rotary compressor, FIG. 7 is a sectional view taken along line BB of FIG. 6, and FIG. 8 is an enlarged sectional view of an essential part showing the resonance chamber. 1 ... Airtight container, 2 ... Rotating shaft, 3 ... Electric element, 4 ...
... Rotary compression element, 5 ... Cylinder, 6 ... Eccentric part, 7 ...
… Roller, 8 …… Low pressure chamber, 9 …… High pressure chamber, 10 …… Vane, 11 …… Upper bearing, 12 …… Lower bearing, 15 …… Discharge port, 16 …… Discharge valve, 17 …… Suction Ports, 19, 20, 21 ... Small spaces.

Claims (1)

[Claims] 1. An electric element having a rotary shaft in a closed container,
The rotary compression element driven by the rotary shaft of the electric element is housed, and the compression element includes a cylinder, an eccentric part of the rotary shaft, a roller rotating in the cylinder by the eccentric part, and a cylinder contacting the roller. It has a vane that divides the inside into a low pressure chamber and a high pressure chamber, and a bearing portion that seals the opening of the cylinder. The bearing portion has a discharge port that communicates with the high pressure chamber, and a discharge valve that opens and closes this discharge port. And a suction port communicating with the low pressure chamber is provided in the cylinder, and the fluid compressed in the cylinder is discharged from the discharge port into the closed container. There is a space that opens into the cylinder in this part, and this space is opened from the suction port to the rotation angle of 180 ° with the vane as the base. The noise suppressor of the rotary compressor according to symptoms.