JPH08284862A - Rotary compressor - Google Patents

Abstract

PURPOSE: To provide a rotary compressor that is able to prevent wear and abrasion by feeding every sliding part with lubricating oil speedily even in the case where it is used in a refrigerating cycle or the like, and a liquid back is therefore generated and the lubricating oil in the sliding part between a vane and a roller is removed. CONSTITUTION: This compressor is composed of a feed oil pipe 26 whose one end is opened in lubricating oil 18 and the other end is opened to a suction part 25 consisting of a suction pipe 14 and a suction chamber, a temperature judging means 30 interlocking with a downstream side temperature detecting means 28 and an upstream side temperature detecting means 29 installed in a suction pipeline 27 of a cooling system 13 at the outside of a closed casing 1 being communicated to this suction pipe 14, and an on/off operating means 31 being installed in the feed oil pipe 26 and interlocking with this temperature judging means 30, respectively.

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 or the like, and more particularly to improving reliability.

[0002]

2. Description of the Related Art As a conventional rotary compressor, Japanese Patent Laid-Open No. Sho 62-62
There is one disclosed in Japanese Patent Publication No. 199990.

An example of the conventional rotary compressor will be described below with reference to the drawings. FIG. 4 is a vertical sectional view of a conventional rotary compressor, and FIG. 5 is a sectional view taken along line BB of FIG.

In FIGS. 4 and 5, 1 is a closed casing, 1a is a refrigerant gas space, 2 is an electric element, and 3 is a shaft, which is composed of a main shaft 3a, an auxiliary shaft 3b and a crank 3c.

Reference numeral 4 is a cylinder, 5 is a roller rotatably housed in the crank 3c of the shaft, and 6 is a vane that reciprocates in a groove provided in the cylinder.

Reference numeral 7 is a main bearing, and 8 is a sub bearing, which is fixed to the end surface of the cylinder 4. Compression element 9 including cylinder 4, roller 5, vane 6, main bearing 7, sub-bearing 8
Is connected to the electric element 2 via a shaft 3.

Numeral 10 indicates the back surface of the vane 6 and the cylinder 4.
It is a spring provided between them. Reference numerals 11a and 11b denote a suction chamber and a compression chamber, respectively, which are constituted by the roller 5, the vane 6, the main bearing 7, and the auxiliary bearing 8 in the cylinder 4.

Reference numeral 12 is a coil spring 1 fixed to the counter shaft 3b.
2a and a guide tube 12b fixed to the auxiliary bearing 8 are oil supply mechanisms.

Reference numeral 13 is a cooling system, 14 is a suction pipe, and the suction pipe 14, the auxiliary bearing 8 and the suction passage 15 of the cylinder 4 are provided.
Through the suction chamber 11a.

Reference numeral 16 denotes a discharge portion, which communicates with the inside of the closed casing 1 via a discharge valve (not shown). Reference numeral 17 denotes a discharge port, which is opened in the closed casing 1 to provide the cooling system 1
It communicates with 3. Reference numeral 18 is a lubricating oil in the closed casing 1.

Reference numerals 20, 21, and 22 are a condenser, an expansion valve, and an evaporator of the cooling system 13, respectively. The cooling system 13 is configured with the compressor.

The operation of the rotary compressor having the above structure will be described below. The refrigerant gas from the cooling system 13 is guided through the suction pipe 14 and the suction passage 15 to reach the suction chamber 11a in the cylinder 4. The refrigerant gas that has reached the suction chamber 11a is partitioned by the roller 5 and the vane 6 that are rotatably accommodated in the crank 3c of the shaft 3 into the compression chamber 1
At 1b, it is progressively compressed by the rotation of the shaft 3 as the electric element 2 rotates. The compressed refrigerant gas is discharged from the discharge unit 1.
6. After being once discharged into the closed casing 1 through the discharge valve (not shown), the cooling system 13 is discharged through the discharge port 17.
Is discharged.

The lubricating oil 18 accumulated in the lower portion of the closed casing 1 is rotated by the coil spring 12a fixed to the sub shaft 3b of the oil supply mechanism 12, and is passed through the coil spring 12a in the guide tube 12b to the sub shaft 3b. And lubricate the sliding parts. Further, between the vane 6 and the cylinder 4, when the vane 6 reciprocates, it is immersed in the lubricating oil 18 stored in the closed casing 1 to supply oil to the vane 6, and the sliding between the vane 6 and the cylinder 4 is performed. The moving part is lubricated and sealed.

[0014]

However, in the above-mentioned conventional structure, the lubrication of the sliding portion between the tip of the vane 6 and the outer periphery of the roller 5 where the sliding condition is severe is such that the end surface of the roller 5 and the main bearing 7,
It is performed by sucking the lubricating oil from the clearance of the auxiliary bearing 8, the lubricating oil from the clearance between the vane 6 and the cylinder 4, the main bearing 7, and the auxiliary bearing 8 and the lubricating oil discharged to the cooling system 13. .

In these methods, since the lubricating oil is usually supplied to the sliding portion, the liquid refrigerant flows into the suction chamber 11a and the compression chamber 11b and the lubricating oil on the sliding portion between the tip of the vane 6 and the outer periphery of the roller 5 is used. When the water was washed away, it took a certain amount of time for the sliding portion to be lubricated again, and during that time, the sliding portion became unlubricated, and there was a problem that abrasion might occur.

Further, if the amount of oil supply is increased by increasing the clearance or the like, the leakage loss is increased and the suction chamber 1 is constantly operated.
1a, the lubricating oil is supplied into the compression chamber 11b, and there is a problem that the efficiency of the heat exchanger may be lowered because the oil level is lowered and the lubricating oil is discharged to the system.

The present invention solves the above-mentioned conventional problems. Even when liquid back occurs and the lubricating oil on the sliding portion of the vane and the roller is removed, the sliding portion is quickly lubricated, An object is to provide a rotary compressor that can prevent wear.

Further, when the contact load between the vane 6 and the roller 5 becomes large, the sliding condition becomes severe, and if lubrication is not sufficiently performed, the oil film may be broken and wear may occur. It was

The present invention solves the above-mentioned problems of the prior art by increasing the contact load between the vane 6 and the outer periphery of the roller 5,
An object of the present invention is to provide a rotary compressor capable of supplying sufficient lubricating oil to the sliding portion and preventing wear when the sliding condition becomes severe.

Further, in the liquid back judgment based on the temperature, even if the liquid back is such that the liquid refrigerant does not enter the compression chamber 11b, the lubricating oil is supplied from the oil supply pipe, the oil supply becomes excessive, and the efficiency may decrease. There was a problem. Further, when the contact load between the vane 6 and the roller 5 increases, the sliding state becomes severe, and if lubrication is not sufficiently performed, the oil film may be broken and wear may occur.

The present invention solves the above-mentioned problems of the prior art. When the liquid refrigerant invades the compression chamber due to the liquid bag and the lubricating oil in the sliding portion of the vane and the roller is removed, it slides quickly. Parts are lubricated to prevent wear and
An object of the present invention is to provide a rotary compressor capable of supplying sufficient lubricating oil to the sliding portion and preventing wear when the contact load between the vane and the outer circumference of the roller is large and the sliding condition is severe.

[0022]

To achieve this object, a rotary compressor according to the present invention comprises a hermetic casing, an electric element, a compression element including a cylinder, a roller, a vane, a main bearing, and a sub bearing. A suction chamber and a compression chamber that are configured inside the compression element, a lubricating oil that is stored in the bottom of the closed casing, a suction pipe that connects the cooling system outside the closed casing and the suction chamber, and one end that opens in the lubricating oil. Suction tube at the end,
An oil supply pipe that opens to the suction part consisting of a suction chamber, a suction pipe of a cooling system outside the closed casing that communicates with the suction pipe, a downstream temperature detecting means arranged in the suction pipe, and a downstream temperature on the suction pipe. The upstream temperature detecting means arranged at a position where the piping path from the closed casing is longer than the detecting means, the temperature determining means interlocking with the downstream temperature detecting means and the upstream temperature detecting means, and the temperature determining means provided in the oil supply pipe The opening / closing means interlocks with the means.

Further, the closed casing and the electric element, the compression element constituted by the cylinder, the roller, the vane, the main bearing and the auxiliary bearing, the suction chamber and the compression chamber formed in the compression element, and the reservoir at the bottom of the closed casing. The lubricated oil, a suction pipe communicating the cooling system outside the closed casing with the suction chamber, an oil supply pipe having one end opened in the lubricating oil and the other end opened to the suction part including the suction pipe and the suction chamber, and the vane. A reciprocating load detecting means provided on the vane in the reciprocating direction, and a reciprocating load determining means interlocking with the reciprocating load detecting means,
It comprises an opening / closing means provided on the oil supply pipe and interlocking with the reciprocating load determining means.

Further, the closed casing and the electric element, the compression element constituted by the cylinder, the roller, the vane, the main bearing and the auxiliary bearing, the suction chamber and the compression chamber formed in the compression element, and the reservoir at the bottom of the closed casing. The lubricated oil, a suction pipe communicating the cooling system outside the closed casing with the suction chamber, an oil supply pipe having one end opened in the lubricating oil and the other end opened to the suction part including the suction pipe and the suction chamber, and a cylinder. And a sliding surface orthogonal direction load detecting means provided on the vane or the cylinder in a direction perpendicular to the sliding surface of the vane and the sliding surface, a sliding surface orthogonal direction load determining means which is interlocked with the sliding surface orthogonal direction load detecting means, and oil supply. The pipe is provided with an opening / closing means which is interlocked with a load determining means perpendicular to the sliding surface.

[0025]

According to the rotary compressor of the present invention, even if liquid backing occurs and the lubricating oil in the sliding portion between the vane and the roller is removed, the rotary compressor passes through the suction pipe and the like into the suction chamber. Since the lubricating oil is supplied and the sliding portion between the vane and the roller is lubricated, abrasion can be prevented and reliability is improved.

Further, when the contact load of the roller of the vane is large and the sliding condition is severe, the lubricating oil is supplied from the oil supply pipe to the suction chamber through the suction pipe and the like, and the sliding portion of the vane and the roller is sufficiently lubricated. Therefore, abrasion can be prevented and reliability is improved.

Further, even if liquid back occurs and the liquid refrigerant enters the compression chamber to remove the lubricating oil from the sliding portion of the vane and the roller, the lubricating oil passes from the oil supply pipe through the suction pipe to the suction chamber. Is supplied and the sliding parts of the vanes and rollers are lubricated,
Wear can be prevented and reliability is improved. In addition, since the lubricating oil is supplied only when the liquid refrigerant surely enters the compression chamber, it is possible to reduce the efficiency drop due to high / low pressure short circuit, the oil level drop due to excessive lubricating oil discharge, and the heat exchanger efficiency drop. To be done.
Further, when the contact load of the vane roller is large and the sliding condition is severe, the lubricating oil is supplied from the oil supply pipe to the suction chamber through the suction pipe etc., and the sliding portion of the vane and the roller is sufficiently lubricated. Therefore, abrasion can be prevented and reliability is improved.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the rotary compressor according to the present invention will be described below with reference to the drawings. It should be noted that the same configurations as those of the conventional one are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is an operation explanatory diagram of a rotary compressor according to a first embodiment of the present invention. In FIG. 1, reference numeral 25 denotes a suction portion including a suction pipe 14, a suction passage 15, and a suction chamber 11a. 26 is a lubricating oil 18 at one end of the closed casing 1
It is an oil supply pipe that opens inside and the other end opens inside the suction pipe 14.

Reference numeral 27 is a suction pipe outside the closed casing 1 from the evaporator 20 to the suction pipe 14. 28, 29
Are the downstream temperature detecting means and the upstream temperature detecting means provided in the suction pipe 27 extending from the cooling cycle to the suction pipe 14, respectively, and the downstream temperature detecting means 28 is arranged on the downstream side in the cooling cycle 13. It is set up.

Further, reference numeral 30 is a temperature determining means which is interlocked with the downstream temperature detecting means 28 and the upstream temperature detecting means 29. Reference numeral 31 is an opening / closing means provided in the oil supply pipe and linked with the temperature determination means 30.

The operation of the rotary compressor constructed as above will be described below. Downstream temperature detecting means 2
8 and the upstream side temperature detecting means 29 detect the temperature at each point, and the temperature is lower on the upstream side during normal operation. At this time, the temperature determining means 30 outputs a close signal to the temperature determining means 30. The interlocking opening / closing means 31 is closed.

Therefore, there is no reduction in efficiency due to high or low pressure short circuit, and there is no reduction in oil level due to excessive discharge of lubricating oil or reduction in efficiency of the heat exchanger.

Further, the temperature detecting means 28 on the downstream side of the suction pipe
May detect a lower temperature than the upstream temperature detecting means 29, but at this time, the temperature determining means 30 works in conjunction with each other to output an open signal. This means that when the downstream temperature detecting means 28 detects a temperature lower than that of the upstream temperature detecting means 29, the presence and evaporation of the liquid refrigerant in the suction pipe occurs, and it can be determined that a large amount of liquid back has occurred. This is because.

Since the opening / closing means 31 opens the oil supply pipe 26 in conjunction with the opening signal of the temperature detecting means 29, the lubricating oil flows from the oil supply pipe 26 to the suction chamber 11a via the suction pipe 14 and the suction passage 15 due to the pressure difference. Is supplied.

Therefore, even if the lubricating oil is removed from the sliding portion between the vane 6 and the roller 5 due to the liquid back, the lubricating oil is promptly supplied and the sliding portion is lubricated, so that wear can be prevented. , Reliability is improved.

Incidentally, in order to prevent continuous refueling from the refueling pipe, the judging means may be provided with a delaying means for switching to the closed state when the open state continues for a predetermined time.

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

FIG. 2 is a diagram for explaining the operation of the rotary compressor according to the second embodiment of the present invention. In FIG. 2, reference numeral 32 is a reciprocal load detecting means using a strain gauge attached to the vane, and 33 is a reciprocal load determining means interlocking with the reciprocal load detecting means 32. Further, 34 is the oil supply pipe 2
The operation of the rotary compressor configured as described above, which is the opening / closing means provided in the No. 6 and interlocking with the reciprocating load determining means 33, will be described below.

The reciprocating load detecting means 32 uses a strain gauge to detect the load in the reciprocating direction of the vane 6. With respect to the load during normal operation, the reciprocating load determining means 33 interlocking with the reciprocating direction load detecting means 32 outputs a closing signal, and the opening / closing means 34 interlocking with the reciprocating direction load determining means 33 is closed. There is.

Therefore, there is no reduction in efficiency due to high or low voltage short circuit, and there is no reduction in oil level due to excessive discharge of lubricating oil or reduction in efficiency of the heat exchanger.

However, the contact load between the vane 6 and the outer periphery of the roller 5 may increase due to an increase in the pressure difference and the sliding condition may become severe.
The load detected by 2 increases, and the reciprocal load determining means 33, which operates in conjunction with the reciprocal load detecting means 32, outputs an open signal. Since the opening / closing means 34 interlocking with the reciprocating load determining means 33 is opened, the suction chamber 11a is passed from the oil supply pipe 26 through the suction pipe 14 and the suction passage 15 due to the pressure difference.
Is supplied with lubricating oil.

Therefore, even if the load increases and the sliding condition between the vane 6 and the roller 5 becomes severe, the lubricating oil is supplied, so that the wear can be prevented and the reliability is improved.

In this embodiment, the strain gauge attached to the vane 6 is used as the reciprocating load detecting means 32.
It goes without saying that the same effect can be obtained by detecting the load on the vane 6 from the suction pressure and the discharge pressure.

Next, a third embodiment of the present invention will be described with reference to the drawings. The same components as those in the second embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 3 is an operation explanatory diagram of a rotary compressor according to a third embodiment of the present invention. In FIG. 3, reference numeral 35 is a load detecting means at right angles to the sliding surface using a piezoelectric element attached to the sliding surface of the vane 6 of the cylinder 4, and 36 is load determining means in the reciprocating direction which works in conjunction with the reciprocating load detecting means 35. Is. Further, the operation of the rotary compressor, which is configured as described above, is an opening / closing means 37 provided on the oil supply pipe 26 and interlocking with the reciprocating direction load determining means 36.

The load detecting means 35 for the direction perpendicular to the sliding surface uses a strain gauge to detect the load in the direction perpendicular to the sliding surface of the vane 6 and the cylinder 4. Under normal operating load, the sliding surface right-angle direction load detecting means 36, which is interlocked with the sliding surface right-angle direction load detecting means 35, outputs a closing signal, and is further interlocked with the sliding surface right-angle direction load determining means 36. The opening / closing means 37 is closed.

Therefore, there is no reduction in efficiency due to high or low pressure short circuit, and there is no reduction in oil level due to excessive discharge of lubricating oil or reduction in efficiency of the heat exchanger.

However, as the pressure difference increases, the vane 6
The contact load on the outer periphery of the roller 5 may increase and the sliding condition may become severe. At this time, the suction chamber 11a and the compression chamber 1
Since the pressure difference of 1b becomes large, the load detected by the sliding surface perpendicular direction load detecting means 32 becomes large, and the sliding surface perpendicular direction load determining means 36 interlocked with the sliding surface perpendicular direction load detecting means 32 is opened. The signal of is output.

Then, the load determining means 36 in the direction perpendicular to the sliding surface
Since the opening / closing means 37 interlocked with is opened, the lubricating oil is supplied from the oil supply pipe 26 to the suction chamber 11a via the suction pipe 14 and the suction passage 15 due to the pressure difference. Therefore, even if the load increases and the sliding state of the vane 6 and the roller 5 becomes severe, the lubrication is supplied, so that the wear can be prevented and the reliability is improved.

Further, when liquid back occurs, the liquid refrigerant enters the compression chamber 11b, and when the liquid refrigerant is compressed in the compression chamber 11b, the pressure in the compression chamber 11b becomes much higher than usual. The load detected by the sliding surface right-angle direction load detecting means 32 increases, and the sliding surface right-angle direction load determining means 36 interlocking with the sliding surface right-angle direction load detecting means 32 outputs an open signal.

Then, the load determining means 36 in the direction perpendicular to the sliding surface
Since the opening / closing means 37 interlocked with is opened, the lubricating oil is supplied from the oil supply pipe 26 to the suction chamber 11a via the suction pipe 14 and the suction passage 15 due to the pressure difference.

In this case, as compared with the liquid back judgment method based on the temperature of the suction pipe, only when the liquid refrigerant surely enters the compression chamber and the lubricating oil in the sliding portion between the vane 6 and the roller 5 is removed. Since the lubricating oil is supplied, a decrease in efficiency due to a high / low pressure short circuit, a decrease in oil level due to excessive discharge of lubricating oil, and a decrease in efficiency of the heat exchanger are reduced.

Therefore, when the liquid refrigerant enters the compression chamber due to the liquid back, the lubricating oil is promptly supplied, so that even if the lubricating oil in the sliding portion between the vane 6 and the roller 5 is removed, the sliding portion remains. Since it is lubricated, it is possible to prevent wear, improve reliability, and reduce occurrence of a decrease in efficiency when supplying lubricating oil.

[0055]

As described above, according to the present invention, the closed casing, the electric element, the compression element constituted by the cylinder, the roller, the vane, the main bearing and the auxiliary bearing, and the suction chamber constituted in the compression element. Suction consisting of a compression chamber, a suction pipe that connects the cooling system outside the closed casing to the suction chamber, lubricating oil that is stored in the bottom of the closed casing, one end opened in the lubricating oil, and the other end that is a suction pipe and a suction chamber Portion of the cooling system outside the closed casing that communicates with the suction pipe and the suction pipe, the downstream temperature detection means disposed in the suction pipe, and the downstream casing on the suction pipe from the downstream temperature detection means Upstream temperature detecting means disposed at a position where the pipe path from the engine is long, temperature determining means interlocking with the downstream temperature detecting means and upstream temperature detecting means, and interlocking with the temperature determining means provided in the oil supply pipe. That consists of an opening and closing means. Therefore, even if liquid back occurs and the lubricating oil on the sliding portion of the vane and the roller is removed, the lubricating oil is supplied from the oil supply pipe to the suction chamber through the suction pipe, etc. Since it is lubricated, it is possible to prevent wear and improve reliability.

Further, the closed casing and the electric element, the compression element constituted by the cylinder, the roller, the vane, the main bearing and the auxiliary bearing, the suction chamber and the compression chamber formed in the compression element, and the cooling of the outside of the closed casing. A suction pipe that connects the system and the suction chamber, a lubricating oil that is stored in the bottom of the closed casing, an oil supply pipe that has one end opened in the lubricating oil and the other end that is the suction pipe, and the suction part that is formed by the suction chamber, and a vane. A reciprocating load detecting means provided on the vane in the reciprocating direction, and a reciprocating load determining means interlocking with the reciprocating load detecting means,
It comprises an opening / closing means provided on the oil supply pipe and interlocking with the reciprocating load determining means. Therefore, when the contact load of the vane roller is large and the sliding condition is severe, lubricating oil is supplied from the oil supply pipe to the suction chamber through the suction pipe, etc., and the sliding portion of the vane and the roller is sufficiently lubricated, Wear can be prevented and reliability is improved.

Further, the closed casing and the electric element, the compression element constituted by the cylinder, the roller, the vane, the main bearing and the auxiliary bearing, the suction chamber and the compression chamber formed in the compression element, and the cooling of the outside of the closed casing. A suction pipe that communicates the system with the suction chamber, lubricating oil that is stored in the bottom of the closed casing, an oil supply pipe that has one end opened in the lubricating oil and the other end that is the suction pipe, and the suction part that consists of the suction chamber, and the cylinder. And a sliding surface orthogonal direction load detecting means provided on the vane or the cylinder in a direction perpendicular to the sliding surface of the vane and the sliding surface, a sliding surface orthogonal direction load determining means which is interlocked with the sliding surface orthogonal direction load detecting means, and oil supply. The pipe is provided with an opening / closing means which is interlocked with a load determining means perpendicular to the sliding surface.

Therefore, even if liquid back occurs and the liquid refrigerant enters the compression chamber and the lubricating oil in the sliding portion between the vane and the roller is removed, the lubricating oil passes from the oil supply pipe through the suction pipe to the suction chamber. Since it is supplied and the sliding portion between the vane and the roller is lubricated, abrasion can be prevented and reliability is improved.

Further, since the lubricating oil is supplied only when the liquid refrigerant surely enters the compression chamber, the efficiency is reduced due to a high / low pressure short circuit, the oil level is lowered due to excessive lubricating oil discharge, and the efficiency of the heat exchanger is increased. The drop is reduced.

When the contact load of the roller of the vane is large and the sliding condition is severe, lubricating oil is supplied from the oil supply pipe to the suction chamber through the suction pipe and the like, and the sliding portion of the vane and the roller is sufficiently lubricated. Therefore, abrasion can be prevented and reliability is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a rotary compressor according to the present invention.

FIG. 2 is a block diagram showing a second embodiment of the rotary compressor according to the present invention.

FIG. 3 is a block diagram showing a third embodiment of the rotary compressor according to the present invention.

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

5 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Hermetically-sealed casing 2 Electric element 3 Shaft 4 Cylinder 5 Roller 6 Vane 7 Main bearing 8 Secondary bearing 9 Compression element 11a Suction chamber 11b Compression chamber 14 Suction pipe 18 Lubricating oil 25 Suction part 26 Oil supply pipe 27 Suction pipe 28 Downstream temperature detecting means 29 upstream temperature detecting means 30 temperature determining means 31 opening / closing means 32 reciprocating direction load detecting means 33 reciprocating direction load determining means 34 opening / closing means 35 sliding surface orthogonal direction load detecting means 36 sliding surface orthogonal direction load determining means 37 opening / closing means

Claims (3)

[Claims] 1. A hermetic casing and an electric element, a compression element including a cylinder, a roller, a vane, a main bearing, and a sub bearing, an intake chamber and a compression chamber formed in the compression element, and an outside of the hermetic casing. Of the cooling system and the suction chamber, a lubricating oil stored in the bottom of the closed casing, one end opened in the lubricating oil, and the other end of the suction pipe and the suction chamber. An oil supply pipe that opens, a suction pipe of the cooling system outside the closed casing, which communicates with the suction pipe, a downstream temperature detecting means arranged in the suction pipe, and a downstream temperature detecting means on the suction pipe. The upstream side temperature detecting means arranged at a position where the pipe path from the closed casing is longer, the temperature determining means which works in conjunction with the downstream side temperature detecting means and the upstream side temperature detecting means, and A rotary compressor comprising an opening / closing means provided on an oil supply pipe and linked with the temperature determining means. 2. A hermetic casing and an electric element, a compression element including a cylinder, a roller, a vane, a main bearing, and a sub bearing, an intake chamber and a compression chamber formed in the compression element, and the outside of the hermetic casing. Of the cooling system and the suction chamber, a lubricating oil stored in the bottom of the closed casing, one end opened in the lubricating oil, and the other end of the suction pipe and the suction chamber. An open oil supply pipe, a reciprocal load detecting means provided on the vane in the reciprocating direction of the vane, a reciprocal load determining means interlocking with the reciprocal load detecting means, and the reciprocating motion provided on the oil supply pipe. A rotary compressor comprising an opening / closing means interlocking with a directional load determining means. 3. A closed casing and an electric element, a compression element including a cylinder, a roller, a vane, a main bearing, and a sub bearing, an intake chamber and a compression chamber formed in the compression element, and the outside of the closed casing. Of the cooling system and the suction chamber, a lubricating oil stored in the bottom of the closed casing, one end opened in the lubricating oil, and the other end of the suction pipe and the suction chamber. The oil supply pipe that opens, the load detecting means for the sliding surface perpendicular direction provided on the vane or the cylinder in a direction perpendicular to the sliding surface of the cylinder and the vane, and the load detecting means for the sliding surface orthogonal direction. A rotary compressor comprising: a sliding surface right-angle direction load determining means and an opening / closing means provided on the oil supply pipe and interlocking with the sliding surface right-angle direction load determining means.