JP3236366B2 - Rotary 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 rotary compressor used in a refrigeration cycle and the like, and more particularly to improvement of reliability.

[0002]

2. Description of the Related Art A conventional rotary compressor is disclosed in
There is one disclosed in Japanese Patent Application Laid-Open No. 3-134888. Hereinafter, an example of the above-described rotary compressor will be described with reference to the drawings.

FIGS. 3 and 4 show a conventional configuration. 3 and 4, reference numeral 1 denotes a closed casing, 2 denotes an electric motor unit, and a mechanical unit main body 9 including a cylinder 4, a roller 5, a vane 6, a main bearing 7, and an auxiliary bearing 8 via a shaft 3.
It is linked to The shaft 3 includes a main shaft 3a, a sub shaft 3b, and a crank 3c. Reference numeral 10 denotes a spring provided on the back of the vane.

[0004] Reference numeral 11 denotes a compression chamber in the cylinder 4 which is constituted by a roller 5, a vane 6, a main bearing 7, and an auxiliary bearing 8. Reference numeral 12 denotes an oil supply mechanism connected to the shaft 3. 13
Is a suction pipe fixed to the cylinder 4 and communicates with the compression chamber 11 via a suction passage 14 of the cylinder 4.

A discharge hole 15 communicates with the inside of the closed casing 1 through a discharge valve 16. Reference numeral 17 denotes a discharge pipe which is open into the closed casing 1. 18 is a lubricating oil.

The motor unit 2 includes a rotor 2a and a stator 2
b and the rotor 2a has a balance weight 2
c and 2d are fixed.

[0007] Refrigerant gas from a cooling system (not shown) is guided through a suction pipe 13 and a suction passage 14 and reaches a compression chamber 11 in a cylinder 4. The refrigerant gas that has reached the compression chamber 11 is
In the compression chamber 11 partitioned by the roller 5 and the vane 6 fitted to the crank 3 c of the shaft 3, the compression is gradually performed by the rotation of the shaft 3 and the roller 5 accompanying the rotation of the electric motor unit 2. Therefore, during compression, the high-pressure chamber 11a and the low-pressure chamber 11b exist.

[0008] The compressed refrigerant gas passes through a discharge hole 15 and a discharge valve 16 provided in the sub-bearing 8 to form a closed casing 1.
Once discharged into the cooling system through the discharge pipe 17. Further, the lubricating oil 18 is supplied to sliding portions such as the shaft 3 and the rollers 5, the main bearing 7, and the sub-bearing 8 by the oil supply mechanism 12.

[0009]

However, in the above-described structure, when a liquid refrigerant, not a gaseous refrigerant, is sucked into the compression chamber of the compressor from the refrigerating cycle, such as when the compressor is started, the compression chamber is not used. The lubricating oil adhering to the sliding parts such as the cylinders, rollers, vanes, main bearings, sub-bearings, etc., which constitutes the above, is removed. Therefore, the sliding portion is operated in a state where there is almost no lubricating oil, and the sliding portion, particularly the sliding portion between the vane tip and the roller where the sliding state is close to the metal contact even when the lubricating oil is supplied, is provided. There was a problem in reliability such as wear. In addition, the wear of each sliding portion constituting the compression chamber reduces the processing accuracy of the sliding portion and the sealing performance of each seal portion sealed with lubricating oil, thereby reducing the efficiency of the compressor. There was a problem. Further, since the pressure of the liquid refrigerant discharged from the compression chamber becomes extremely high by compressing the liquid refrigerant, there is a reliability problem that the discharge valve is damaged.

[0010] Further, the liquid refrigerant discharged from the compression chamber into the closed casing is supplied to a sliding portion such as a shaft, a main bearing, a sub-bearing, and rollers by an oil supply mechanism together with lubricating oil stored in a lower portion of the closed casing. You. Therefore, lubricating oil containing a large amount of liquid refrigerant is supplied to the sliding parts such as the shaft and the main bearing and the sub-bearing, and there is a problem in reliability that the sliding parts are worn.

The present invention solves the above-mentioned problems, and prevents each of the sliding portions constituting the compression chamber by preventing the liquid refrigerant from being drawn into the compression chamber of the compressor from the refrigeration cycle with a simple configuration. It is another object of the present invention to improve the reliability of a discharge valve and the like, and to prevent a decrease in compressor efficiency due to a decrease in sealing performance of each seal portion.

Further, it is possible to prevent the liquid refrigerant discharged from the compression chamber of the compressor into the closed casing from being supplied to the sliding portion such as the shaft by the oil supply mechanism together with the lubricating oil stored in the lower portion of the closed casing. Especially shafts, main bearings,
The purpose is to improve the reliability of the auxiliary bearing.

[0013]

SUMMARY OF THE INVENTION A suction pipe having one end communicating with the outside of the closed casing and the other end communicating with a suction passage provided in the cylinder, and an axial extension of the suction pipe, and at least one of a cylinder and a main bearing. A discharge passage having one end communicating with the suction passage and the other end communicating with the closed casing, and a valve mechanism provided at an open end of the discharge passage communicating with the closed casing.

Further, a tank is provided at an open end communicating with the inside of the closed casing of the discharge path, and a communication hole opened to the closed casing vertically above the tank is provided.

[0015]

According to the present invention, when the compressor is started and the liquid refrigerant is sucked from the refrigerating cycle when the compressor is started, the liquid refrigerant can be discharged without being sucked into the compression chamber. As a result, the lubricating oil of each sliding portion forming the compression chamber is not removed by the liquid refrigerant, and the lubricating oil can be always secured, thereby preventing wear of each sliding portion forming the compression chamber. And reliability is improved. Also, by preventing the abrasion of each of the sliding parts constituting the compression chamber, it is possible to prevent the processing accuracy of the sliding parts and the sealing performance of each of the sealing parts sealed with lubricating oil from being reduced. Can be prevented from decreasing. Further, damage to the discharge valve and the like due to compression of the liquid refrigerant can be prevented, and the reliability of the discharge valve is improved.

Further, it is possible to prevent the liquid refrigerant discharged into the closed casing from the compression chamber of the compressor from being supplied to the sliding portion such as the shaft by the oil supply mechanism together with the lubricating oil stored in the lower portion of the closed casing. In particular, the reliability of the shaft, the main bearing, and the sub bearing is improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a rotary compressor according to the present invention will be described with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a longitudinal sectional view of a rotary compressor according to a first embodiment of the present invention. In FIG. 1, 19a, 19
b is a discharge path having one end communicating with the suction passage 14 provided in the cylinder 4 and the other end communicating with the closed casing 1.
9a is a discharge passage provided in the cylinder 4, and 19b is a discharge passage.
Is a discharge passage provided in the main bearing. 20 is a discharge path 19
a, 19b, open end 19c communicating with closed casing 1
It is a valve mechanism provided in.

The flow of the suction refrigerant in the rotary compressor constructed as described above will be described below.

When the compressor is started, the liquid refrigerant remaining in the evaporator may be sucked into the compressor. When the liquid refrigerant is sucked into the compressor, first, the liquid refrigerant flows through the suction pipe 13 and is guided to the suction passage 14 provided in the cylinder 4. Since the mass flow rate of the liquid refrigerant is much larger than that of the gaseous refrigerant, the liquid refrigerant flows straight by inertia due to inertia and flows therethrough, and the discharge passage 19 a of the cylinder 4 extending in the axial direction of the suction pipe 13 and the discharge of the main bearing 7. It flows to the road 19b.

The liquid refrigerant flowing to the open end 19c of the discharge passages 19a and 19b communicating with the closed casing 1 opens the valve mechanism provided at the open end 19c by inertia due to its mass flow rate, and closes the valve. Released into the casing 1.

Therefore, when the compressor is started, even if the liquid refrigerant is sucked into the compressor from the evaporator, the liquid refrigerant remains in the compression chamber 11.
It is possible to remove the lubricating oil 18 adhering to each sliding portion of the compression chamber 11 such as the cylinder 4, the roller 5, the vane 6, the main bearing 7, and the sub-bearing 8 without being sucked. Disappears. Therefore, the lubricating oil 18 of each sliding portion forming the compression chamber 11 is not removed by the liquid refrigerant, and the lubricating oil 18 can be always secured. Wear can be prevented, and reliability is improved.

Further, by preventing the sliding portions constituting the compression chamber 11 from being worn, it is possible to prevent the working accuracy of the sliding portions and the sealing performance of each sealing portion sealed with the lubricating oil 18 from being lowered. In addition, it is possible to prevent a decrease in the efficiency of the compressor. Further, damage to the discharge valve 16 and the like caused by compressing the liquid refrigerant can be prevented, and the reliability of the discharge valve 16 is improved.

When the refrigerant gas is sucked into the compressor, the inertia force due to the mass flow rate of the refrigerant gas is smaller than that of the liquid refrigerant, so that the valve mechanism 20 remains closed without opening, and as a result, the refrigerant gas is The gas is guided to the compression chamber 11, and normal gas compression is performed.

As described above, the rotary compressor of this embodiment is
A suction pipe having one end communicating with the outside of the closed casing and the other end communicating with a suction passage provided in the cylinder; and a shaft extending in the axial direction of the suction pipe and having one end provided in at least one of the cylinder and the main bearing. Since it has a discharge path whose other end is in communication with the closed casing and a valve mechanism provided at an open end communicating with the closed casing of the discharge path, such as when the compressor is started, the refrigeration cycle When the liquid refrigerant is sucked, the liquid refrigerant can be discharged without being sucked into the compression chamber. As a result, the lubricating oil of each sliding portion forming the compression chamber is not removed by the liquid refrigerant, and the lubricating oil can be always secured, thereby preventing wear of each sliding portion forming the compression chamber. And reliability is improved.

Further, by preventing wear of each sliding portion constituting the compression chamber, it is possible to prevent the processing accuracy of the sliding portion and the sealing performance of each seal portion sealed with lubricating oil from being reduced. It is possible to prevent the efficiency of the machine from decreasing. Further, damage to the discharge valve and the like due to compression of the liquid refrigerant can be prevented, and the reliability of the discharge valve is improved.

Next, a second embodiment of the rotary compressor according to the present invention will be described with reference to the drawings. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 2 is a longitudinal sectional view of a rotary compressor according to a second embodiment of the present invention. In FIG. 2, reference numeral 21 denotes a tank provided at an opening end 19c of the discharge passage 19b provided in the main bearing 7 to the closed casing 1. Reference numeral 21a denotes a communication hole provided vertically above the tank 21 and opened to the closed casing 1.

The flow of the suction refrigerant in the rotary compressor constructed as described above will be described below.

When the compressor is started and the liquid refrigerant remaining in the evaporator is sucked into the compressor, the liquid refrigerant flows into the suction pipe 13, the suction passage 14, the discharge passages 19a and 19b, and the open ends. After flowing to 19c, it is discharged into the closed casing 1 via a valve mechanism provided at the open end 19c.

The discharged liquid refrigerant is temporarily stored in the tank 2
1 and is not mixed with the lubricating oil 18 stored in the lower portion in the closed casing 1.

Therefore, the liquid refrigerant sucked into the compressor together with the lubricating oil 18 stored in the lower portion of the closed casing is prevented from being supplied to the sliding parts such as the shaft, the main bearing and the auxiliary bearing by the oil supply mechanism 12. Especially for shafts, main bearings,
The reliability of the auxiliary bearing is improved.

Further, as the operation time of the compressor elapses,
The temperature inside the closed casing 1 gradually rises due to the heat generated by the motor unit 2 and the liquid refrigerant stored in the tank 21 gasifies, returns to the closed casing 1 from the communication hole 21a provided vertically above, and returns to the closed casing 1 again. Can be used as

As described above, the rotary compressor of this embodiment is
A tank is provided at an open end communicating with the inside of the closed casing of the discharge path, and a communication hole is provided in the closed casing vertically above the tank, so that the liquid discharged from the compression chamber of the compressor into the closed casing is provided. Refrigerant can be prevented from being supplied to a sliding portion such as a shaft by a lubricating mechanism together with the lubricating oil stored in the lower portion of the closed casing, and in particular, the reliability of the shaft, the main bearing, and the sub bearing is improved.

[0035]

As described above, according to the present invention, a suction pipe having one end communicating with the outside of the closed casing and the other end communicating with a suction passage provided in the cylinder extends in the axial direction of the suction pipe,
A discharge passage is provided at at least one of the cylinder and the main bearing, one end of which communicates with the suction passage and the other end of which communicates with the closed casing, and a valve mechanism provided at an open end of the discharge passage which communicates with the closed casing. Therefore, when the liquid refrigerant is sucked from the refrigeration cycle, such as when the compressor is started, the liquid refrigerant can be discharged without being sucked into the compression chamber.
As a result, the lubricating oil of each sliding portion forming the compression chamber is not removed by the liquid refrigerant, and the lubricating oil can be always secured, thereby preventing wear of each sliding portion forming the compression chamber. And reliability is improved. Also, by preventing the abrasion of each of the sliding parts constituting the compression chamber, it is possible to prevent the processing accuracy of the sliding parts and the sealing performance of each of the sealing parts sealed with lubricating oil from being reduced. Can be prevented from decreasing. Further, damage to the discharge valve and the like due to compression of the liquid refrigerant can be prevented, and the reliability of the discharge valve is improved.

Further, since a tank is provided at an open end communicating with the inside of the closed casing of the discharge path, and a communication hole is opened in the closed casing vertically above the tank, the inside of the closed casing is moved from the compression chamber of the compressor. Liquid refrigerant discharged into the closed casing together with lubricating oil stored in the lower part,
The oil supply mechanism can prevent the oil from being supplied to a sliding portion such as a shaft, and the reliability of the shaft, the main bearing, and the sub bearing is particularly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary compressor showing a first embodiment according to the present invention.

FIG. 2 is a longitudinal sectional view of a rotary compressor showing a second embodiment according to the present invention.

FIG. 3 is a longitudinal sectional view of a conventional rotary compressor.

FIG. 4 is a cross-sectional view taken along the line III-III ′ of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed casing 4 Cylinder 7 Main bearing 8 Secondary bearing 13 Suction pipe 14 Suction passage 19a, 19b Discharge passage 19c Open end 20 Valve mechanism 21 Tank 21a Communication hole

Claims (1)

(57) [Claims] 1. A closed casing, and said closed casing.
Cylinder housed inside and fixed to both ends of the cylinder
Main bearing and auxiliary bearing, and one end of the closed casing
The other end is connected to the suction passage provided at the other end of the cylinder.
A suction pipe communicating with the passage, and extending in an axial direction of the suction pipe,
One of the cylinders and the main bearing
One end communicates with the suction passage and the other end is inside the closed casing.
And a closed passage of the discharge passage.
And a valve mechanism provided at the open end communicating with the inside.
An opening communicating with the inside of the closed casing of the discharge path.
A tank is provided at the end, and a closed case is provided vertically above the tank.
A rotary compressor that has a communication hole that opens into the ring.