JPH04287889A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the noise of a delivery valve and oil hitting sound generated at a valve seat face part by forming a seat face for bringing the delivery valve and a delivery valve bearing into contact with an auxiliary bearing, into the length one third or more of the length from the fixing point of the delivery valve retainer to the tip of the delivery valve, and providing an oil relief groove on the seat face. CONSTITUTION:The seat face for fixing the delivery valve 14 is extended into the length of more than one third of the distance from a fulcrum K, where a delivery valve retainer 15 presses the delivery valve 14 down, to the tip of the delivery valve 14, so that the antinode part of the delivery valve 1 in the secondary bending mode comes in contact with the valve contact seat face 18 at the time of being deformed in the valve contact seat face direction. The regulation of secondary bending mode vibration is thereby lost to reduce noise caused by the vibration of the delivery valve 14. Oil hitting sound at the valve contact seat face 18 during the delivery stroke is generated because of oil entering onto the extended face of the seat face for fixing the delivery valve 14 so as to be hit by the delivery valve 14. Accordingly, this noise is reduced by providing an oil relief groove 19 on the valve contact seat face 18 to form such structure as to prevent oil from being collected easily.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used in refrigeration equipment, etc., and relates to a rotary compressor structure that reduces vibration and noise during operation.

0002

2. Description of the Related Art A conventional technique will be explained with reference to FIGS. 4 to 6. FIG. 4 is a longitudinal cross-sectional view of a conventional rotary compressor, FIG. 5 is a cross-sectional view of a main part showing a conventional discharge valve section, and FIG. 6 is an explanatory diagram showing a vibration form of a conventional discharge valve. In the figure,
1 is a sealed case that houses the electric motor and compression mechanism. 2 is the stator of the electric motor, 3 is the rotor of the electric motor, 4 is the
This is a rotating shaft press-fitted into the rotor 3. 5 is a main bearing, and 6 is a sub-bearing, which supports the rotating shaft 4. 7 indicates a welding point, where the main bearing 5 is welded and fixed to the sealed case 1. 8
is a cylinder, which is sandwiched and fastened between a main bearing 5 and a sub-bearing 6. 9 is a crankshaft that constitutes an eccentric portion of the rotating shaft 4. 10 is a roller, and the crankshaft 9
It fits into the cylinder 8 and moves along the inner wall of the cylinder 8. Reference numeral 11 denotes a vane whose tip abuts against the roller 10 and divides the space inside the cylinder 8 into a suction chamber and a compression chamber 17.

Reference numeral 12 denotes a discharge chamber, which is formed in the sub-bearing 6. Reference numeral 13 denotes a discharge chamber cover, which is fastened to the end of the sub-bearing 6. 14 is a discharge valve, 15 is a discharge valve receiver,
It is installed in the discharge chamber 12 of the sub-bearing 6. Reference numeral 16 denotes a discharge hole, which is provided in the sub-bearing 6 , one of which is formed in a conical shape toward the discharge valve 14 , and the other communicates with the compression chamber 17 of the cylinder 7 . In the conventional rotary compressor configured as described above, the crankshaft 9 rotates eccentrically due to the driving force of the rotor 3, and the vanes 11 perform reciprocating motion following the eccentric rotation of the roller 10. None, the suction and compression strokes are repeated one after another, and the refrigerant gas is discharged from the discharge hole 16 through the discharge valve 1.
4 is pushed open and discharged into the discharge chamber 12.

0004

In the conventional rotary compressor as described above, when compressed refrigerant gas is discharged from the discharge hole 16, the discharge valve 14 receives the outflow force and causes self-excited vibration. This will be explained with reference to FIG. When the discharge gas pushes open the discharge valve 14 and flows out, it flows toward the tip of the valve. Therefore, in addition to opening and closing movements, the discharge valve 14 also has two movements as shown by the broken line in the figure.
The next bending mode vibration is excited. This is mainly 1~
The problem was that it generated 2kHz noise. Further, due to a decrease in the discharge amount during the discharge stroke, there is a problem in that an oil pool is formed in the space between the discharge valve 4 and the valve seat surface, and an oil slapping sound is generated.

The present invention has been made to solve the problems of the prior art described above, and suppresses the vibration of the discharge valve excited by the outflow force of the discharged gas, thereby reducing the noise generated by the vibration of the discharge valve. It is an object of the present invention to provide a low-noise rotary compressor in which the sound of oil tapping on the valve seat surface is reduced.

[0006]

[Means for Solving the Problems] In order to achieve the above object, a rotary compressor according to the present invention includes an electric motor in a sealed case and a compression mechanism connected to the electric motor by a rotating shaft having a crankshaft. The compression mechanism includes a cylinder, a roller that rotates eccentrically within the cylinder, a vane that reciprocates following the rotation of the roller, and a cylinder that seals both ends of the cylinder and rotates the rotation shaft. A supporting main bearing and a sub-bearing, a discharge hole formed in the sub-bearing,
In a rotary compressor equipped with a discharge valve and the main bearing fixed to a sealed case, a seat surface for closely contacting the discharge valve and the discharge valve receiver to the sub-bearing is provided from the fixing point of the discharge valve receiver. It is formed to have a length of 1/3 or more of the length to the tip of the discharge valve, and an oil relief groove is provided on the seat surface.

[0007]

[Function] In the rotary compressor of the present invention, the vibration of the discharge valve during the discharge stroke is suppressed by extending the seat surface that fixes the discharge valve to the vicinity of the discharge hole. When the valve is deformed toward the valve seating surface, it comes into contact with the valve seating surface. Therefore, the regularity of the secondary bending mode vibration is lost, and the noise caused by the vibration of the discharge valve can be reduced. In addition, the sound of oil pounding on the valve seating surface during the discharge stroke is caused by oil penetrating onto the surface that extends the seating surface that fixes the discharge valve to the vicinity of the discharge hole and being hammered by the discharge valve. Therefore, the noise can be reduced by providing an oil relief groove on the extended valve seating surface to create a structure that prevents oil from accumulating.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a sectional view of a main part showing a discharge valve part of a rotary compressor according to an embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing the test results regarding the noise level in various frequency ranges of the conventional product and the product of the present invention. Note that the same parts as those in the conventional example are given the same reference numerals and the description thereof will be omitted. In the figure, 18 is a valve seating surface, which is 1/3 of the length from the fulcrum K where the discharge valve receiver 15 holds the discharge valve 14 to the tip of the discharge valve 14.
The seat surface is formed by extending to the above position. Reference numeral 19 denotes an oil relief groove, and vertical and horizontal grooves are formed on the valve seating surface 18.

In the rotary compressor of this embodiment configured as described above, the discharge valve 14 generated by the jet flow during the discharge stroke
Valve contact seating surface 1 up to the part located at the antinode of the secondary bending mode of
8 is formed, the discharge valve 14 has a valve contact seating surface 18.
controlled by contact with. In addition, conventionally, due to a decrease in the discharge amount during the discharge stroke, an oil pool is generated in the space between the discharge valve 14 and the valve sealing surface 18, and an oil slapping sound is generated. By providing the groove 19, a structure is created in which oil does not easily accumulate on the valve seating surface 18, and noise can be reduced. In FIG. 3, the horizontal axis represents frequency (Hz) and the vertical axis represents noise level (dB). The broken line represents the noise of the conventional product shown in FIG. 5, and the noise of the present example shown in FIGS. Noise is shown by a solid line. As is clear from FIG. 3, the noise level in the 1-2 kHz band is lower in the product of the present invention than in the conventional product. From this, by extending the valve tight seat surface 18 and providing an oil relief groove 19 on the extended seat surface, the frequency of 1 to 2 kHz can be reduced.
It can be seen that this is highly effective in reducing band noise.

[0010] As described above, the rotary compressor of this embodiment has the following features:
By extending the valve seating surface to the vicinity of the discharge hole and providing a groove on this extended seating surface, the abdomen of the discharge valve in the secondary bending mode comes into contact with the valve seating surface, which prevents the discharge gas from flowing out. Discharge valve vibrations excited by force can be suppressed, and
Oil tapping noise can be reduced by creating a structure that prevents oil from forming on the valve seating surface.

[0011]

As described above in detail, according to the present invention, the vibration of the discharge valve excited by the outflow force of the discharged gas is suppressed, the noise generated by the vibration of the discharge valve is reduced, and the valve It is possible to provide a low-noise rotary compressor that reduces the sound of oil tapping on the seat surface.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing a discharge valve part of a rotary compressor according to an embodiment of the present invention.

FIG. 2 is a top view of the discharge valve section of FIG. 1;

FIG. 3 is a diagram showing test results regarding noise levels in various frequency ranges for a conventional product and a product of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional rotary compressor.

FIG. 5 is a sectional view of a main part of a conventional discharge valve section.

FIG. 6 is an explanatory diagram showing the vibration form of a conventional discharge valve.

[Explanation of symbols]

1 Sealed case 2 Stator 3 Rotor 4 Rotation axis 5 Main bearing 6 Secondary bearing 8 Cylinder 9 Crankshaft 10 Roller 11 Vane 14 Discharge valve 15 Discharge valve receiver 16 Discharge hole 18 Valve tight seat surface 19 Oil release groove

Claims (1)

[Claims] Claim 1: An electric motor and a compression mechanism unit connected to the electric motor by a rotation shaft having a crankshaft are housed in a sealed case, and the compression mechanism unit includes a cylinder, a roller that rotates eccentrically within the cylinder, A vane that reciprocates following the rotation of the roller, a main bearing and a sub-bearing that seal both ends of the cylinder and support the rotating shaft, a discharge hole formed in the sub-bearing, and a discharge valve. In a rotary compressor in which the main bearing is fixed to a sealed case, the seat surface for tightly fitting the discharge valve and the discharge valve receiver to the sub-bearing is connected from the fixed point of the discharge valve receiver to the tip of the discharge valve. 1. A rotary compressor, characterized in that the rotary compressor is formed to have a length of ⅓ or more of the length of the rotary compressor, and an oil relief groove is provided on the seat surface.