JPH07310689A - Rotary compressor - Google Patents

Abstract

PURPOSE:To enhance reliability of a sliding part by preventing a liquid refrigerant from being sucked into a compression chamber of a compressor at the time of starting. while stopping or the like with a simple constitution in a rotary compressor used for a refrigerating cycle and the like. CONSTITUTION:The device is constituted of a liquid sump 19 equipped in either a cylinder 4 or an auxiliary bearing 8, a first suction passage 20 whose one end is communicated with the outside of a closed casing 1 and whose the other end is opened in the liquid sump 19, and a second suction passage 21 whose one end is opened at a position inside the liquid sump 19 and not opposing to an opening end 20a of the first suction passage 20, while whose the other end is communicated with a suction passage 14 provided in the cylinder 4, and which is arranged perpendicularly above a bottom 19a of the liquid sump 19.

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.
There is one disclosed in Japanese Patent Publication No. 3-134888. An example of the above rotary compressor will be described below with reference to the drawings. The conventional structure is shown in FIGS. 4 and 5
, 1 is a closed casing, 2 is an electric motor part,
Machine part body 9 composed of cylinder 4, roller 5, vane 6, main bearing 7, and sub bearing 8 via shaft 3.
Connected with. The shaft 3 includes a main shaft 3a, a sub shaft 3b, and a crank 3c. Reference numeral 10 is a spring provided on the back surface of the vane.

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 a sub bearing 8. Reference numeral 12 is an oil supply mechanism connected to the shaft 3. 1
A suction pipe 3 is 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. A discharge pipe 17 is open to the inside of the closed casing 1. Reference numeral 18 is a lubricating oil.

Further, the electric motor section 2 includes a rotor 2a and a stator 2
The balance weight 2 is composed of a rotor 2a
c and 2d are fixed.

Refrigerant gas from a cooling system (not shown) is guided through a suction pipe 13 and a suction passage 14 and a cylinder 4 is introduced.
It reaches the compression chamber 11 inside. The refrigerant gas reaching the compression chamber 11 is transferred to the roller 5 fitted to the crank 3c of the shaft 3.
The compression chamber 11 partitioned by the vane 6 and the motor unit 2
Is gradually compressed by the rotational movement of the shaft 3 and the roller 5 accompanying the rotation of the. Therefore, during compression, the high pressure chamber 1
1a and the low pressure chamber 11b exist.

The compressed refrigerant gas passes through the discharge hole 15 and the discharge valve 16 provided in the auxiliary bearing 8 and the hermetic casing 1
After being once discharged into the inside, it is discharged to the cooling system through the discharge pipe 17. Further, the lubricating oil 18 is supplied to the sliding parts such as the shaft 3, the roller 5, the main bearing 7, the sub bearing 8 and the like by the oil supply mechanism 12.

[0008]

However, in the above-mentioned structure, when the liquid refrigerant is sucked from the refrigeration cycle into the compression chamber of the compressor at the time of starting the compressor, instead of the refrigerant in the gaseous state, the compression chamber is compressed. The lubricating oil that adheres to the sliding parts of the cylinder, rollers, vanes, main bearings, auxiliary bearings, etc., is removed. Therefore, the sliding part is operated with almost no lubricating oil, and the sliding part, especially the sliding part between the vane tip and the roller where the sliding condition is close to metal contact even when the lubricating oil is supplied. There was a reliability problem such as wear.

Further, since the sliding parts constituting the compression chamber are worn, the processing accuracy of the sliding parts and the sealing property of each sealing part sealed with the lubricating oil are deteriorated, and the efficiency of the compressor is improved. There was a problem that it decreased.

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.

The present invention solves the above-mentioned problems, and constitutes a compression chamber by preventing intake of the liquid refrigerant from the refrigeration cycle into the compression chamber when the compressor is started, etc., with a simple structure. It is an object of the present invention to improve the reliability of each sliding portion, the discharge valve and the like, and to prevent the efficiency of the compressor from being lowered due to the deterioration of the sealing performance of each sealing portion.

[0012]

According to the present invention, there is provided a first suction passage having one end communicating with the outside of a hermetic casing and the other end opening to the liquid storage part, which is provided in either the cylinder or the auxiliary bearing. And a second suction passage, one end of which opens at a position not facing the opening end of the first suction passage in the liquid reservoir and the other end communicates with the suction passage provided in the cylinder. On the other hand, a second suction passage is provided vertically upward.

Further, a discharge passage provided on a side surface of the liquid storage portion facing the opening end in the liquid storage portion of the first suction passage and communicating the liquid storage portion with the closed casing, and the discharge passage with the closed casing. And a valve mechanism provided at the open end.

Further, a communication passage for communicating the lower part of the reservoir with the inside of the closed casing and a float valve mechanism are provided at the open end of the communication passage in the liquid reservoir, and the float valve mechanism is formed of a shape memory alloy. It is equipped with a biasing mechanism.

[0015]

According to the present invention, when the liquid refrigerant is sucked into the compressor from the refrigeration cycle at the time of starting the compressor, etc., due to the above-mentioned structure, the liquid refrigerant is stored in the liquid storage portion and is heated by the heat of the cylinder or the auxiliary bearing. By gasifying the liquid refrigerant, it is possible to prevent the liquid refrigerant from being sucked into the compression chamber. Therefore, the lubricating oil of each sliding part that constitutes the compression chamber is not removed by the liquid refrigerant, and the lubricating oil can always be secured, so that the sliding parts that constitute the compression chamber are prevented from wear and the like. It is possible and reliability is improved.

Further, by preventing abrasion of each sliding portion which constitutes the compression chamber, it is possible to prevent the processing accuracy of the sliding portion and the deterioration of the sealing property of each sealing portion which is sealed by the lubricating oil from being reduced. It is possible to prevent the efficiency of the machine from decreasing. Furthermore, 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, even if the liquid refrigerant sucked into the compressor from the refrigeration cycle and accumulated in the liquid reservoir cannot be completely gasified by the heat of the cylinder, the auxiliary bearing, etc., the liquid sucked into the liquid reservoir. When the amount of the refrigerant is large, the inertial force of the liquid refrigerant is large, and the inertial force opens the valve that connects and cuts off the liquid reservoir and the inside of the closed casing, and the liquid refrigerant is discharged into the closed casing, It is possible to prevent inhalation into the compression chamber.

Further, the liquid refrigerant sucked into the compressor from the refrigeration cycle and accumulated in the liquid reservoir cannot be completely gasified by the heat of the cylinder and the auxiliary bearing, and the amount of the liquid refrigerant sucked is small. Even if the inertial force is small, the liquid refrigerant remaining in the liquid reservoir can be discharged into the closed casing, and the liquid refrigerant can be prevented from being sucked into the compression chamber.

[0019]

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. The same components as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a vertical sectional view of a rotary compressor according to a first embodiment of the present invention. In FIG. 1, 19 is a liquid reservoir provided in the cylinder 4, and 20 is a first reservoir whose one end communicates with the outside of the closed casing 1 and the other end opens into the liquid reservoir 19.
It is an inhalation route. Reference numeral 21 denotes a second suction passage, one end of which opens in the liquid reservoir 19 at a position not facing the opening end 20a of the first suction passage 20 and the other end of which communicates with the suction passage 14 provided in the cylinder 4. The two suction passages 21 are arranged vertically above the bottom surface 19 a of the liquid reservoir 19.

In the rotary compressor constructed as above, the flow of the suctioned refrigerant will be described below.

At the time of starting the compressor, the liquid refrigerant retained in the evaporator may be sucked into the compressor. When the liquid refrigerant is sucked into the compressor, the liquid refrigerant first flows through the first suction passage 20 and is discharged into the liquid reservoir 19 from the opening end 20a of the first suction passage 20. At that time, the flow velocity is reduced in the liquid reservoir 19, so that the liquid refrigerant is collected from the bottom surface 19a of the liquid reservoir 19. The liquid refrigerant accumulated in the liquid reservoir 19 is overheated by the heat of the cylinder 4, and as a result, is immediately gasified.

Therefore, the gasified refrigerant is sucked into the second suction passage 21 arranged vertically above the bottom surface 19a of the liquid reservoir 19, and the suction passage 14 of the cylinder 4 and the compression chamber. It is possible to prevent the gasified refrigerant from flowing in the inside 11 and suck the liquid refrigerant into the compression chamber 11.

Therefore, even if the liquid refrigerant is sucked from the evaporator into the compressor at the time of starting the compressor, the liquid refrigerant is still compressed.
The lubricant oil 18 adhering to the sliding parts of the cylinder 4, the roller 5, the vanes 6, the main bearing 7, the auxiliary bearing 8 and the like which form the compression chamber 11 can be removed without being sucked into the Disappear. 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 parts constituting the compression chamber 11 from being worn, it is possible to prevent the processing accuracy of the sliding parts and the deterioration of the sealing property of each sealing part sealed by the lubricating oil 18 from being deteriorated. It is possible to prevent the efficiency of the compressor from being lowered.

Further, damage to the discharge valve 16 and the like due to compression of the liquid refrigerant can be prevented, and the reliability of the discharge valve 16 is improved.

As described above, the rotary compressor of this embodiment is
A liquid reservoir 19 provided on either the cylinder 4 or the auxiliary bearing 8, a first suction passage 20 having one end communicating with the outside of the closed casing 1 and the other end opening to the liquid reservoir 19, and one liquid reservoir The bottom surface of the liquid reservoir portion 19 is composed of a second suction passage 21 that opens at a position not facing the open end of the first suction passage 20 in the portion 19 and has the other end communicating with the suction passage 14 provided in the cylinder 4. Since the second suction passage 21 is provided vertically above 19a, the liquid refrigerant is sucked into the compression chamber 11 even if the liquid refrigerant is sucked into the compressor from the refrigeration cycle when the compressor is started. Can be prevented.

Therefore, the lubricating oil of each sliding portion constituting the compression chamber 11 is not removed by the liquid refrigerant,
Since the lubricating oil can be always secured, it is possible to prevent wear and the like of each sliding portion that constitutes the compression chamber 11, and improve the reliability.

Further, by preventing the wear of the sliding parts constituting the compression chamber 11, it is possible to prevent the processing accuracy of the sliding parts and the deterioration of the sealing property of each sealing part sealed by the lubricating oil, It is possible to prevent a decrease in the efficiency of the compressor.
Furthermore, 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 16 is improved.

In this embodiment, the liquid reservoir 19 is provided in the cylinder 4, but it goes without saying that it may be provided in the sub bearing 8.

Next, a second embodiment of the rotary compressor 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 vertical sectional view of a rotary compressor according to a second embodiment of the present invention. In FIG. 2, 19b is the first
Reference numeral 22 denotes a side surface of the liquid reservoir 19 facing the opening end 20a of the suction passage 20, and reference numeral 22 denotes a discharge passage provided on the side surface 19b of the liquid reservoir 19 for communicating the interior of the liquid reservoir 19 with the interior of the closed casing 1. . 22a is a closed casing 1 of the discharge passage 22.
Reference numeral 23 denotes an opening end communicating with the inside, and reference numeral 23 denotes a valve mechanism provided at the opening end 22a of the discharge passage 22.

In the rotary compressor constructed as described above, the flow of the suctioned refrigerant will be described below.

When the liquid refrigerant is sucked into the compressor at the time of starting the compressor, the liquid refrigerant first flows through the first suction passage 20 and reaches the liquid reservoir 19. The liquid refrigerant accumulated in the liquid reservoir 19 is overheated by the heat of the cylinder 4, and as a result, gasification starts immediately.

However, when the temperature of the cylinder 4 is low, not all the liquid refrigerant can be gasified, and some of the liquid refrigerant remains in the liquid state.

At this time, the liquid refrigerant that could not be gasified flows through the discharge passage 22 provided on the side surface 19b of the liquid reservoir 19 facing the opening end 20a of the first suction passage 20, and inside the closed casing 1. To the open end 22a of the discharge path 22 that communicates with.

At this time, when the amount of the liquid refrigerant sucked into the liquid reservoir 19 is large, the inertial force of the liquid refrigerant is large, and the valve mechanism provided at the opening end 22a by the inertial force of the liquid refrigerant. 23 opens and the liquid refrigerant is discharged into the closed casing 1.

Therefore, when the liquid refrigerant is sucked from the evaporator to the compressor at the time of starting the compressor and the like, and it is not possible to gasify all the liquid refrigerant in the liquid reservoir 19, the liquid to be sucked in. When the amount of the refrigerant is large, the inertial force of the liquid refrigerant can be used to discharge the refrigerant into the closed casing 1 without being sucked into the compression chamber 11, so that the cylinder 4, the roller 5 and the cylinder 5 forming the compression chamber 11 can be discharged. , The vane 6, the main bearing 7, the auxiliary bearing 8 and the like are not removed from the lubricating oil 18 adhering to the sliding portions.

Therefore, the lubricating oil 18 of each sliding portion constituting the compression chamber 11 is not removed by the liquid refrigerant, and the lubricating oil 18 can be always secured, so that the sliding oil constituting each compression chamber 11 can be secured. It is possible to prevent abrasion of the moving part and improve reliability.

When the refrigerant gas is sucked into the compressor, the inertial force of the refrigerant gas is much smaller than the inertial force of the liquid refrigerant, so that the valve mechanism 20 does not open but remains closed, resulting in compression. The refrigerant gas sucked into the machine is guided to the compression chamber 11 and is subjected to normal gas compression.

As described above, the rotary compressor of this embodiment is
The liquid reservoir 1 is provided on the side surface 19b of the liquid reservoir 19 facing the opening end 19a in the liquid reservoir 19 of the first suction passage 20.
A discharge passage 22 that communicates the inside of the casing 9 with the inside of the closed casing 1,
An open end 22 of the discharge passage 22 communicating with the inside of the closed casing 1
Since the valve mechanism 23 provided in a is provided, when the liquid refrigerant is sucked from the refrigeration cycle at the time of starting the compressor, the liquid refrigerant cannot be completely gasified in the liquid reservoir. However, when the amount of the liquid refrigerant to be sucked is large, the inertial force of the liquid refrigerant can be used to discharge the liquid refrigerant into the closed casing 1 without sucking it into the compression chamber 11.

Therefore, the lubricating oil of each sliding portion forming the compression chamber 11 is not removed by the liquid refrigerant,
Since the lubricating oil can be always secured, it is possible to prevent wear and the like of each sliding portion that constitutes the compression chamber 11, and improve the reliability.

Next, a third embodiment of the rotary compressor 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. 3 is a vertical sectional view of a rotary compressor according to a third embodiment of the present invention. In FIG. 3, 19c is a lower portion of the liquid reservoir 19, 24 is a communication passage that communicates the inside of the liquid reservoir 19 with the inside of the closed casing 1, and 24a is a communication passage 24.
It is an open end that is opened in the liquid reservoir 19.

Reference numeral 25 is a float valve mechanism provided at the open end 24a of the communication passage 24. Float valve mechanism 2
Reference numeral 5 is composed of a biasing mechanism 25a and a float 25b made of a shape memory alloy. The urging mechanism 25a made of a shape memory alloy is made of a shape memory alloy so that its urging force is weakened at low temperatures, and conversely, its impulsive force is increased at high temperatures.

In the rotary compressor constructed as described above, the flow of the suctioned refrigerant will be described below.

When the liquid refrigerant is sucked into the compressor at the time of starting the compressor, first, the liquid refrigerant flows in the first suction passage 20 and reaches the liquid reservoir 19. The liquid refrigerant accumulated in the liquid reservoir 19 is overheated by the heat of the cylinder 4, and as a result, gasification starts immediately. However, when the temperature of the cylinder 4 is low, not all liquid refrigerant can be gasified, and part of the liquid refrigerant remains in the liquid state. At that time, when the amount of the liquid refrigerant is small, the inertial force of the liquid refrigerant is small, and therefore the discharge using the inertial force as described in the second embodiment cannot be performed.

However, when the liquid refrigerant is overheated by the heat of the cylinder 4 in the liquid reservoir 19 and as a result, a part of the liquid refrigerant is immediately gasified, the temperature in the liquid reservoir 19 is increased by the heat of vaporization of the liquid refrigerant. Is extremely low.

Therefore, the force of the urging mechanism 25a formed of a shape memory alloy that urges the float 25b against the open end 24a of the communication passage 24 is weakened, and the float 25b becomes free to move.

Therefore, since the density of the liquid refrigerant that has not been completely gasified in the liquid reservoir 19 is much higher than that of the refrigerant in the gas state, the float 25b is floated vertically upward, resulting in the liquid reservoir. Inside part 19 and closed casing 1
The inside communicates with the communication passage 24.

The liquid refrigerant is discharged into the closed casing 1 through the communication passage 24 by its own weight.

When the compressor is started up, the liquid refrigerant is sucked into the compressor during the rotation of the shaft 3 for several tens of times after the start-up. The pressure in the casing 1 is almost equal. for that reason,
Even if the force of the urging mechanism 25a is weakened and the float 25b is allowed to move freely, the refrigerant gas in the closed casing 1 does not enter the liquid reservoir 19, and normal gas compression is performed.

In addition, since the biasing mechanism 25a formed of the shape memory alloy has no heat of vaporization when the liquid refrigerant is gasified, when the refrigerant gas is sucked into the compressor and at the time of operation immediately after the start-up. It does not get cold.

Therefore, the force that biases the float 25b to the open end 24a of the communication passage 24 does not weaken, and overcomes the pressure difference between the pressure inside the liquid reservoir 19 and the pressure inside the closed casing 1, and the float valve mechanism 25 Remains closed. As a result, the sucked refrigerant gas is guided to the compression chamber 11, and normal gas compression is performed without the refrigerant gas in the closed casing 1 entering the liquid reservoir 19.

Therefore, when the liquid refrigerant is sucked into the compressor from the evaporator at the time of starting the compressor, it is impossible to completely gasify the liquid refrigerant by the heat of the cylinder 4 in the liquid-liquid reservoir 19 and Even if a part of the refrigerant remains in the liquid reservoir 19 and the amount of the drawn liquid refrigerant is small, the refrigerant can be quickly discharged into the closed casing 1. Therefore, the liquid refrigerant is sucked into the compression chamber 11. Cylinder 4, the roller 5, the vane 6, the main bearing 7, which constitute the compression chamber 11,
It is no longer necessary to remove the lubricating oil 18 adhering to each sliding portion such as the sub bearing 8.

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, so that the sliding oil forming each compression chamber 11 can be secured. It is possible to prevent abrasion of the moving part and improve reliability.

As described above, the rotary compressor of this embodiment is
A communication passage 24 that communicates the lower portion 19c of the liquid reservoir with the interior of the closed casing 1, and an open end 2 of the communication passage 24 in the liquid reservoir 19
4a includes a float valve mechanism 25, and the float valve mechanism includes an urging mechanism formed of a shape memory alloy. Therefore, when liquid refrigerant is sucked from the refrigeration cycle at the time of starting the compressor, Further, even if the liquid refrigerant cannot be completely gasified in the liquid reservoir 19 and a part of the liquid refrigerant remains, and the amount of the liquid refrigerant sucked is small, the liquid refrigerant is not sucked into the compression chamber 11 and the hermetic casing 1 can be discharged.

Therefore, the lubricating oil in each sliding portion forming the compression chamber 11 is not removed by the liquid refrigerant,
Since the lubricating oil can be always secured, it is possible to prevent wear and the like of each sliding portion that constitutes the compression chamber 11, and improve the reliability.

Although the spring is shown as the biasing mechanism in this embodiment, it goes without saying that a biasing mechanism other than the spring may be used.

[0060]

As described above, according to the present invention, the liquid reservoir provided on either the main bearing or the cylinder is connected to the outside of the closed casing at one end and the other end is opened at the liquid reservoir. The suction passage and the second suction passage which has one end opened at a position not facing the opening end of the first suction passage in the liquid reservoir and the other end communicates with the suction passage provided in the cylinder are provided. Since the second suction passage is provided vertically above the bottom surface 1, it is possible to suck the liquid refrigerant into the compression chamber when the liquid refrigerant is sucked from the refrigeration cycle when the compressor is started. It can be prevented. Therefore, the lubricating oil of each sliding part that constitutes the compression chamber is not removed by the liquid refrigerant, and the lubricating oil can always be secured, so that the sliding parts that constitute the compression chamber are prevented from wear and the like. It is possible and reliability is improved.

Further, by preventing the wear of the sliding parts constituting the compression chamber, it is possible to prevent the processing accuracy of the sliding parts and the deterioration of the sealing property of each sealing part sealed by the lubricating oil from being deteriorated. It is possible to prevent the efficiency of the machine from decreasing. Furthermore, 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 improves.

Further, there are a discharge passage provided on a side surface of the liquid storage portion facing the opening end in the liquid storage portion of the first suction passage and communicating the inside of the liquid storage portion and the closed casing, and a closed casing of the discharge passage. Since it is equipped with a valve mechanism provided at the open end that communicates, when liquid refrigerant is sucked from the refrigeration cycle when the compressor is started, etc., the liquid refrigerant is completely gasified in the liquid reservoir. Even if it is not possible, when the amount of the liquid refrigerant to be sucked is large, the inertial force of the liquid refrigerant can be used to discharge the liquid refrigerant into the closed casing 1 without sucking it into the compression chamber 11. Therefore, the lubricating oil of each sliding part that constitutes the compression chamber is not removed by the liquid refrigerant, and the lubricating oil can always be secured, so that the sliding parts that constitute the compression chamber are prevented from wear and the like. It is possible and reliability is improved.

Further, a communication passage for communicating the lower part of the liquid reservoir with the inside of the closed casing, and a float valve mechanism at the opening end of the communication passage in the liquid reservoir, the float valve mechanism being formed of a shape memory alloy. Since the urging mechanism is provided, when the liquid refrigerant is sucked from the refrigeration cycle at the time of starting the compressor, the liquid refrigerant cannot be completely gasified in the liquid reservoir 19 and a part of the liquid refrigerant remains. Moreover, even if the amount of the liquid refrigerant to be sucked is small, the liquid refrigerant can be discharged into the closed casing 1 without being sucked into the compression chamber 11.

[Brief description of drawings]

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

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

FIG. 3 is a sectional view of an essential part of a rotary compressor showing a third embodiment according to the present invention.

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

5 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Closed Casing 4 Cylinder 7 Main Bearing 8 Secondary Bearing 14 Suction Passage 19 Liquid Reservoir 19a Liquid Reservoir Bottom 19b Liquid Reservoir Side 19c Liquid Reservoir Lower 20 First Intake Pass 20a First Intake Pass Open End 21 Second Intake Pass 22 discharge passage 22a discharge passage opening end 23 valve mechanism 24 communication passage 24a communication passage opening end 25 float valve mechanism 25a biasing mechanism

Claims (3)

[Claims] 1. A hermetic casing, a cylinder housed in the hermetic casing, a main bearing and a sub bearing fixed to both ends of the cylinder, and a liquid reservoir provided in either the sub bearing or the cylinder. Section, a first suction passage having one end communicating with the outside of the closed casing and the other end opening to the liquid reservoir, and one end opened in a position not facing the open end of the first suction passage in the liquid reservoir. A rotary compressor having a second suction passage, the other end of which communicates with a suction passage provided in the cylinder, and the second suction passage being provided vertically above the bottom surface of the liquid reservoir. 2. A discharge passage, which is provided on a side surface of the liquid storage portion facing the opening end in the liquid storage portion of the first suction passage, connects the liquid storage portion with the closed casing, and the closed casing of the discharge passage. The rotary compressor according to claim 1, comprising a valve mechanism provided at an opening end communicating with the inside. 3. A shape memory alloy, comprising: a communication passage communicating between the lower part of the liquid reservoir and the inside of the closed casing; and a float valve mechanism provided at an open end of the communication passage in the liquid reservoir. The rotary compressor according to claim 1, further comprising an urging mechanism formed by.