JPH09250481A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a normal compressor due to freezer oil having at most very weak solubility with coolant. SOLUTION: A sealing container 1 is provided with a compression mechanism 2 for sending compression coolant gas and a oil supply pump 23 for supplying non-suluble freezer oil 20 with coolant to the compression mechanism 2. A top face 32 of a partition body 31 arranged at the bottom of the sealing container 1 is arranged in the freezer oil 20, and a void 34 is formed on a side face 33 between the lower end part and the bottom face of the sealing container. A degas tube 35, one end of which is opened at the upper part of the partition body 31 and the other end of which is curved downward, is arranged at the middle position of the height of the side face 33. And, the quantity of liquid coolant 30 at the lower part of the sealing container 1 increases, and raise near the compression mechanism 2 of the freezer oil 20 is prevented by means of the partition body 31. Therefore, liquid coolant supply to the compression mechanism is prevented, and faults due to lubrication failure are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor mainly for a refrigerating machine, an air conditioner and having a compression mechanism provided in a closed container.

[0002]

2. Description of the Related Art FIG. 14 is a view showing a conventional compressor disclosed in, for example, Japanese Utility Model Laid-Open No. 5-6178, which is a vertical sectional view of the scroll compressor. In the figure, 1 is a closed container.

Reference numeral 2 denotes a compression mechanism provided in the closed container 1, a fixed scroll 3 arranged near the upper part of the closed container 1, an orbiting scroll 4 provided with spiral teeth meshing with spiral teeth of the fixed scroll 3, An oscillating bearing 5, a refrigerant suction hole 6, a discharge hole 7, a compression chamber 8 formed between the fixed scroll 3 and the oscillating scroll 4, a main shaft 9 eccentrically supported by the oscillating bearing 5, and a main shaft 9. Main bearing 10 and main bearing 1 to support
Bearing frame 11 for supporting 0 and the like in the closed container 1, and Oldham coupling 12 provided between the orbiting scroll 4 and the main bearing 10.
It is composed by.

Reference numeral 13 is an electric motor provided below the compression mechanism 2, and is composed of a stator 14 fixed to the closed container 1 and a rotor 15 fixed to the main shaft 9. Reference numeral 16 is an oil supply hole provided longitudinally through the longitudinal axis of the main shaft 9, and is provided so as to be opened in each bearing portion of the compression mechanism 2 for oil supply. Reference numeral 17 is a lower bearing support that supports the lower end of the main shaft 9, 18 is a lower bearing, and 19 is an oil reservoir provided in the lower portion inside the closed container 1.

Reference numeral 20 denotes refrigerating machine oil contained in the oil reservoir 19.
Reference numeral 21 is a refrigerant suction pipe connected to an evaporator (not shown), 22 is a refrigerant discharge pipe connected to a condenser (not shown), 23 is a positive displacement oil pump such as a gear pump, and the lower end is an oil pump. A suction pipe 24 that opens into the refrigerating machine oil 20 in the reservoir 19 is provided.

The conventional compressor shown in FIG. 14 is constructed as described above, and when the electric motor 13 is energized, the swinging scroll 4 swings by the rotation of the main shaft 9. As a result, the refrigerant gas is sucked from the refrigerant suction pipe 21, sucked into the suction hole 6 through the space between the bearing frame 11 and the electric motor 13, compressed in the compression chamber 8, and then discharged from the discharge hole 7. Also,
The lower bearing support 17 has a structure that does not block the space on the oil sump 19 side and the lower side of the electric motor 13. Therefore, the gas refrigerant, the liquid refrigerant, and the refrigerating machine oil 20 can flow between the upper side and the lower side of the lower bearing support 17 without any obstacle.

FIG. 15 shows, for example, Japanese Patent Laid-Open No. 60-16.
It is a figure which shows the other conventional compressor shown by 6784, Comprising: It is a lower end longitudinal cross-sectional view of a scroll compressor. In the figure, 1 is a closed container, 9 is a main shaft, 13 is an electric motor, and is constituted by a stator 14 fixed to the closed container 1 and a rotor 15 fixed to the main shaft 9. Reference numeral 16 is an oil supply hole provided longitudinally through the main shaft 9.

Reference numeral 19 is an oil reservoir provided in the lower portion of the closed container 1, 20 is refrigerating machine oil contained in the oil reservoir 19, 25 is an oil cap attached to the lower end of the main shaft 9, and 26 is an oil cap 25. Through holes provided on the lower surface, and 27 are partition plates, which are arranged below the electric motor 13 above the oil sump 19 and fixed in the closed container 1, and a communication hole 28 close to the spindle 9.
A communication hole 29 is provided between the main shaft 9 and the inner surface of the closed casing 1.

The conventional compressor shown in FIG. 15 is constructed as described above, and when the electric motor 13 is energized, the rotation of the main shaft 9 causes a centrifugal force action in the oil cap 25 to suck the refrigerating machine oil 20 from the through hole 26. To do. Then, the sucked refrigerating machine oil 20 is supplied to each bearing portion of the compression mechanism 2 similar to that shown in FIG.

Further, when the liquid refrigerant flows into the closed container 1 from the suction pipe 21 together with the gas refrigerant during operation of the refrigerating machine or the like, the liquid refrigerant in the closed container 1 becomes oil as shown in FIG. Enter the reservoir 19.

In the conventional compressors shown in FIGS. 14 and 15, a refrigerant HCF which has been conventionally used in a refrigerating machine or the like.
22 and the CFC 12 are soluble in the refrigerating machine oil 20 made of mineral oil, synthetic oil or the like, and the liquid refrigerant and the refrigerating machine oil 20 melt each other. The refrigerating machine oil 20 in which the liquid refrigerant is dissolved has a certain degree of viscosity, and the refrigerating machine oil 20 in which the liquid refrigerant is dissolved is present near the lower end portion of the suction pipe 24 of the oil supply pump 23 to obtain an appropriate amount of refueling. To be Therefore, the refrigerating machine oil 20 in which the liquid refrigerant in the oil reservoir 19 is melted enables the bearings of the compression mechanism 2 to be fluidly lubricated.

Refrigerating machine oil 20 in which the refrigerant component is dissolved
At the start of the operation of the compressor, the dissolved refrigerant component is vaporized in the refrigerating machine oil 20 and foaming occurs in the refrigerating machine oil 20. Therefore, malfunction of the oil supply pump 23 occurs and normal operation of the compressor is hindered. A partition plate 27 shown in FIG. 15 is provided in order to suppress the forming with respect to such a problem.

As described above, the liquid refrigerant is dissolved in the refrigerating machine oil 20 not only when the liquid refrigerant accumulates in the closed container 1, but also in a normal operating state, that is, a gas refrigerant having an appropriate heating degree. Even when the refrigerant flows in from the refrigerant suction pipe 21, the refrigerant component is dissolved in the refrigerating machine oil 20 stored in the oil reservoir 19.

As described above, since the refrigerant conventionally used in the refrigerating machine or the like has mutual solubility with the refrigerating machine oil 20, only the liquid refrigerant is not separated from the refrigerating machine oil 20. Therefore, the bearings of the compression mechanism 2 are fluidly lubricated by the refrigerating machine oil 20 in which the liquid refrigerant in the oil reservoir 19 is dissolved.

However, with respect to the use of the refrigerant that is mutually soluble with the refrigerating machine oil 20 described above, fluid lubrication of each bearing portion of the compression mechanism 2 by the refrigerating machine oil 20 that is not mutually soluble with the liquid refrigerant has been proposed. There is. That is, FIG. 16 and FIG. 17 are views for explaining the state of the oil reservoir of the compressor when liquid refrigerant and refrigerating machine oil having no mutual solubility are used, and FIG. FIG. 17 and FIG. 17 are views for explaining another state of the oil sump portion of the compressor, corresponding to FIG.

In the figure, the same reference numerals as those in FIGS. 14 and 15 described above indicate the corresponding parts, and 30 is the liquid refrigerant accumulated in the oil sump portion 19, and due to the difference in specific gravity from the refrigerating machine oil 20, FIG.
6, the liquid refrigerant 30 stays under the refrigerating machine oil 20, or as shown in FIG.
Stay above 0.

The specific gravity of the liquid refrigerant 30 is usually 1.1-.
It is about 1.4, and the specific gravity of the refrigerating machine oil 20 is 0.8 to 0.
It is about 9. Therefore, as shown in FIG. 16, the oil reservoir 1
The liquid refrigerant 30 will be retained in the lower layer of 9, and the refrigerating machine oil 20 will be retained in the upper layer.

[0018]

A compressor in which the refrigerating machine oil 20 having no mutual solubility with the liquid refrigerant is supplied to each bearing portion of the compression mechanism 2, and the compressor is in the state shown in FIG. 16 described above. In the above, when the amount of the liquid refrigerant 30 accumulated in the oil reservoir 19 below the closed container 1 increases, the refrigerating machine oil 20 is pushed up to near the compression mechanism 2. When the compressor is activated, the refrigerating machine oil 20 flows out of the closed container 1, and the opening of the suction pipe 24 of the oil supply pump 23 is only the liquid refrigerant 30. Therefore, each bearing of the compression mechanism 2 has a low viscosity liquid refrigerant 3
Only 0 is supplied.

Further, since the liquid refrigerant 30 is finally vaporized, there is a problem that the lubricating action is extremely insufficient and a failure such as seizure occurs due to poor lubrication. That is,
In a conventional compressor, when a refrigerating machine oil that is insoluble or weakly compatible with a refrigerant is used, that is, when a refrigerating machine oil that is weakly compatible with a refrigerant is used, the compressor becomes inoperable. Become.

The present invention has been made to solve the above problems, and even if a refrigerating machine oil having a weak compatibility at most with a refrigerant is used, it is insoluble or weakly soluble in the refrigerant. An object of the present invention is to obtain a compressor that can supply a refrigerating machine oil having a high solubility or a liquid refrigerant in which the refrigerating machine oil is slightly dissolved to the bearing portion to obtain a normal lubricating action.

[0021]

In a compressor according to the present invention, a compression mechanism is provided in a closed container for delivering compressed refrigerant gas to the outside, and a compressor is stored in the bottom of the closed container to form a refrigerant. On the other hand, the refrigerating machine oil has a weak compatibility at most, the lower end of the suction pipe is placed in the refrigerating machine oil, the oil supply pump that supplies the refrigerating machine oil to the compression mechanism, and the bottom part of the closed container is provided with the oil supply pump It has an annular shape with a cavity corresponding to the suction pipe of the pump, the side surface is hung from the edge of the upper surface, and a partition with a gap between the lower end and the bottom of the closed container, and one end Is opened to the upper part of the partition and bent downward outside the partition, and the other end is provided with a gas vent pipe arranged at an intermediate position of the side height.

Further, in the compressor according to the present invention,
A partition body is provided in the center of the closed container, the side surface of which is formed to form a space between the inner surface of the closed container and the suction pipe of the oil supply pump is inserted into the partition body.

Further, in the compressor according to the present invention,
A compression mechanism that is placed in a closed container to deliver compressed refrigerant gas to the outside, a refrigerator oil that is stored at the bottom of the closed container and has a weak compatibility at most with the refrigerant, and a lower end of the suction pipe An oil supply pump which is arranged in the refrigerating machine oil and supplies the refrigerating machine oil to the compression mechanism, a refrigerant suction pipe which is provided in the closed container and sucks the refrigerant gas, and a refrigerant suction pipe which is provided in the refrigerant suction pipe and is located below the compression mechanism position. And a volume expansion section arranged.

Further, in the compressor according to the present invention,
A compression mechanism that is placed in a closed container to deliver compressed refrigerant gas to the outside, a refrigerator oil that is stored at the bottom of the closed container and has a weak compatibility at most with the refrigerant, and a lower end of the suction pipe Below the compression mechanism position, an oil supply pump that is placed in the refrigeration oil and supplies the refrigeration oil to the compression mechanism, a refrigerant suction pipe that is provided in a closed container and that sucks refrigerant gas, and this refrigerant suction pipe is extended. Is provided with a volume of more than the amount of refrigerating machine oil required for lubricating the compressor.

[0025]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. 1 to 7 are views showing an example of an embodiment of the present invention, and FIG. 1 is a vertical sectional view of a scroll compressor,
2 to 7 are enlarged vertical cross-sectional views of essential parts of the scroll compressor of FIG. 1 for explaining the states of the refrigerant and the refrigerating machine oil in the oil reservoir of the closed container. In the figure, 1 is a closed container.

Reference numeral 2 denotes a compression mechanism provided in the closed container 1, a fixed scroll 3 arranged near the upper part of the closed container 1, an orbiting scroll 4 provided with spiral teeth meshing with the spiral teeth of the fixed scroll 3, An oscillating bearing 5, a refrigerant suction hole 6, a discharge hole 7, a compression chamber 8 formed between the fixed scroll 3 and the oscillating scroll 4, a main shaft 9 eccentrically supported by the oscillating bearing 5, and a main shaft 9. Main bearing 10 and main bearing 1 to support
Bearing frame 11 for supporting 0 and the like in the closed container 1, and Oldham coupling 12 provided between the orbiting scroll 4 and the main bearing 10.
It is composed by.

Reference numeral 13 is an electric motor provided below the compression mechanism 2, and is composed of a stator 14 fixed to the closed container 1 and a rotor 15 fixed to the main shaft 9. Reference numeral 16 is an oil supply hole provided longitudinally through the longitudinal axis of the main shaft 9, and is provided so as to be opened in each bearing portion of the compression mechanism 2 for oil supply. Reference numeral 17 is a lower bearing support that supports the lower end of the main shaft 9, 18 is a lower bearing, and 19 is an oil reservoir provided in the lower portion inside the closed container 1.

Reference numeral 20 denotes refrigerating machine oil contained in the oil reservoir 19.
Reference numeral 21 is a refrigerant suction pipe connected to an evaporator (not shown), 22 is a refrigerant discharge pipe connected to a condenser (not shown), 23 is a positive displacement oil pump such as a gear pump, and the lower end is an oil pump. A suction pipe 24 that opens into the refrigerating machine oil 20 in the reservoir 19 is provided.

Reference numeral 31 denotes a partition, which is provided in the bottom of the closed container 1 and has an annular shape in which a cavity corresponding to the suction pipe 24 of the oil supply pump 23 is formed in the center, and the side surface 33 is an edge portion of the upper surface 32. A space 34 is formed between the lower end portion and the bottom surface of the closed container 1 by being hung from the bottom. The partition 31
Is formed to have a larger volume than the volume from the bottom of the closed container 1 in the oil reservoir 19 to the lower end of the suction pipe 24 of the oil supply pump 23.

Reference numeral 35 denotes a gas vent pipe, which is formed with an upper surface 32 of the partition 31 at one end, that is, an upper opening 36 opening to the upper part of the partition 31, is bent downward outside the partition 31, and at the other end. A lower opening 37 is formed at an intermediate position of the height of the side surface 33 excluding the void 34. Reference numeral 38 is a void formed in the partition 31 in a specific situation.

In the compressor configured as described above,
When the electric motor 13 is energized, the rotation of the main shaft 9 operates the oil supply pump 23 to suck the refrigerating machine oil 20 from the suction pipe 24. Then, the sucked refrigerating machine oil 20 is supplied to each bearing portion or the like of the compression mechanism 2 through the oil supply hole 16 although not shown.

The state before charging the closed container 1 with the refrigerant is as shown in FIG. That is, when charging the refrigerant, the inside of the refrigerant circuit (not shown) of the air conditioner or the like is evacuated, so that the inside of the closed container 1 and the partition 31
All of the vacant spaces 38 are in a vacuum state. In addition, the partition 31
The inner liquid level is formed at the position of the lower opening 37 of the gas vent pipe 35.

Next, the state after charging the closed container 1 with the refrigerant is as shown in FIG. That is, when the refrigerant is charged in the refrigerant circuit, the pressure in the refrigerant circuit rises, but the inside of the partition 31 becomes a vacuum state. Therefore, the void 38 in the partition 31 disappears and is filled with the refrigerator oil 20.

The state in which the liquid refrigerant 30 has entered the closed container 1 is as shown in FIG. That is, 30 in FIG. 4 is a liquid refrigerant, and the liquid refrigerant 30 stays below the refrigerating machine oil 20 due to the specific gravity, and removes the refrigerating machine oil 30 in the partition 31. Then, at the position where the liquid level of the liquid refrigerant 30 reaches the position of the lower opening 37 of the gas vent pipe 35, the pressure is balanced and the liquid level of the liquid refrigerant 30 in the partition 31 is stabilized.

The state when the temperature around the compressor rises from the state of FIG. 4 and the liquid refrigerant 30 evaporates is as shown in FIG. That is, 39 in FIG. 5 is a gas refrigerant, which is the liquid refrigerant 30 accumulated in the oil reservoir 19 and the partition 31.
Evaporates to become the gas refrigerant 39 and raises the pressure in the refrigerant circuit such as an air conditioner and the partition 31.

However, in comparison with the volume of the refrigerant circuit, the partition 3
Since the volume of 1 is much smaller, even if a small amount of the gas refrigerant 39 enters the partition 31, the pressure in the partition 31 becomes higher than the pressure of the refrigerant circuit. And the refrigerator oil 20
Is discharged by gas pressure, but the equilibrium state of pressure is shown in FIG.
The refrigerating machine oil 20 is stabilized in a state where it is held in the partition body 31 at the positions where H1 / H2 = {ρ1 (liquid refrigerant density) / ρ2 (refrigerating machine oil density)}-1 at the distances H1 and H2.

Further, the state when the temperature around the compressor is lowered from the state of FIG. 5 and the gas refrigerant 39 is condensed is as shown in FIG. That is, the gas refrigerant 3 in the partition 31
Since 9 condenses and the pressure in the partition 31 also decreases, the liquid level in the partition 31 and the liquid level on the lower opening 37 side of the gas vent pipe 35 also rise. However, at the positions H3 / H4 = {ρ1 (liquid refrigerant density) / ρ2 (refrigerator oil density)}-1 at the distances H3 and H4 shown in FIG. Stabilize.

In the state in which the compressor is left unoperated as described above, the refrigerating machine oil 20 held in the partition body 31 retains the partition body 31 no matter how the ambient temperature of the compressor changes. It is retained without leaking out. When the compressor is operated with the liquid refrigerant 30 accumulated in the oil reservoir 19, the refrigerating machine oil 20 around the compression mechanism 2 flows out of the compressor, and then the liquid refrigerant 30 evaporates. Gasify.

As a result, when the liquid surface of the liquid refrigerant 30 descends, the refrigerating machine oil 20 held in the partition body 31 flows out of the partition body 31 through the gap 34, and enters the suction pipe 24 of the oil supply pump 23. When inhaled, it functions as lubricating oil in the compressor. The state when the operation is stopped is shown in FIG.
As shown in. That is, the refrigerator oil 2 is contained in the compressor.
Since 0 is sufficiently returned, the refrigerating machine oil 20 is retained in the partition 31 when the operation is stopped.

The amount of refrigerating machine oil 20 held in the partition 31 at this time is set as described below. That is, from the bottom surface of the closed container 1 of the oil reservoir 19 to the suction pipe 2 of the oil supply pump 23.
4 In addition to the capacity up to the lower end, the amount of the refrigerating machine oil 20 that is sucked into the oil supply pump 23 and necessary to lubricate the sliding parts such as the bearing parts of the compression mechanism 2 is obtained so that The position of the lower opening 37 is determined.

As a result, in the compressor in which the refrigerating machine oil 20 having no mutual solubility with the liquid refrigerant as described above is supplied to the bearings and the like of the compression mechanism 2, the oil sump 1 below the closed container 1 is provided.
When the amount of the liquid refrigerant 30 accumulated in 9 increases, the phenomenon that the entire amount of the refrigerating machine oil 20 is pushed up to near the compression mechanism 2 is eliminated. Further, when the compressor is started, the entire amount of the refrigerating machine oil 20 flows out of the closed container 1, the opening of the suction pipe 24 of the oil supply pump 23 becomes only the liquid refrigerant 30, and the bearings of the compression mechanism 2 have a low viscosity liquid. It is possible to solve the problem that only the refrigerant 30 is supplied.

Therefore, when the liquid refrigerant 30 is finally vaporized, it is possible to prevent occurrence of a failure such as seizure due to poor lubrication due to extremely insufficient lubrication. That is, in the compressor when the refrigerating machine oil which is not soluble or has a weak compatibility with the refrigerant is used, that is, when the refrigerating machine oil having a weak compatibility with the refrigerant is used at most, the normal lubricating action is obtained. Therefore, it is possible to prevent an accident in which the compressor cannot be operated.

Embodiment 2. FIG. 8 is a vertical cross-sectional view of an oil reservoir portion of a scroll compressor showing an example of another embodiment of the present invention. The compressor is configured in the same manner as the above-described embodiment shown in FIGS. 1 to 7 except for FIG. In the figure, 1 is an airtight container, 17 is a lower bearing support that supports the lower end of the main shaft 9, 19 is an oil reservoir provided in the inner lower part of the airtight container 1, and 23 is a positive displacement oil pump such as a gear pump. A suction pipe 24 whose lower end opens into the refrigerating machine oil 20 of the oil reservoir 19 is provided.

A partition 31 is provided in the oil reservoir 19 at the center of the bottom of the closed container 1, and the side surface 33 is arranged so as to form a space between the side surface 33 and the inner circumference of the closed container 1. A space 34 is formed between the lower end portion and the bottom surface of the closed container 1 by being formed so as to hang down from the edge portion. Further, the lower bearing support 17 is provided in the center of the upper surface 32 in a penetrating state, and the oil supply pump 23 is provided in the partition body 31.

The partition 31 is formed to have a volume larger than the volume of the oil reservoir 19 up to the lower end of the suction pipe 24 of the oil supply pump 23. Reference numeral 35 denotes a gas vent pipe, which has an upper surface 32 of the partition 31 at one end, that is, an upper opening 36 opening to the upper portion of the partition 31, is formed to bend downward outside the partition 31, and a void 34 is removed at the other end. A lower opening 37 is formed at an intermediate position of the height of the side surface 33.

Also in the compressor configured as described above, a partition 31 is provided at the bottom of the closed container 1 and one end is partitioned as in the embodiment shown in FIGS. Open at the upper part of 31 and bend downward and the lower opening 3 of the other end
7 is a gas vent pipe 3 arranged at an intermediate position of the side 33 height
5 are provided.

Therefore, although detailed description is omitted, FIG.
Also in this embodiment, the same operation as the embodiment of FIGS. 1 to 7 can be obtained. In addition, the fuel pump 2 is provided in the partition 31.
Since the three suction pipes 24 are arranged, the refrigerating machine oil 20 can be more reliably supplied to the compression mechanism 2.

Embodiment 3. FIG. 9 is also a vertical cross-sectional view of the oil reservoir portion of the scroll compressor showing an example of another embodiment of the present invention. The compressor is configured in the same manner as the above-described embodiment shown in FIGS. 1 to 7 except for FIG. In the figure, the same reference numerals as those in FIG. 2 described above indicate corresponding parts, and 35 is a gas vent pipe, which has an upper opening 36 opened at the upper edge of the side surface 33 of the partition 31 at one end and bent downward. A lower opening 37 is formed at the other end of the side surface 33, excluding the gap 34, at an intermediate position of the height of the side surface 33.

Also in the compressor configured as described above, a partition 31 is provided at the bottom of the closed container 1 and one end is partitioned as in the embodiment shown in FIGS. Open at the upper part of 31 and bend downward and the lower opening 3 of the other end
7 is a gas vent pipe 3 arranged at an intermediate position of the side 33 height
5 are provided.

Therefore, although detailed description is omitted, FIG.
Also in this embodiment, the same operation as the embodiment of FIGS. 1 to 7 can be obtained. Further, even with the gas vent pipe 35 having the shape shown in FIG. 9, the refrigerating machine oil 2 held in the partition body 31
The opening position of the gas vent pipe 35 is such that the opening position of the gas vent pipe 35 is in the above-mentioned pressure balance state, that is, H1 / H2 = {ρ1 (liquid refrigerant density) / ρ2 in FIG. If the (refrigerator oil density)}-1 is satisfied, the same effect as that of the above-described embodiment of FIGS. 1 to 7 can be obtained.

Fourth Embodiment 10 and 11 are also views showing an example of another embodiment of the present invention. FIG. 10 is a vertical sectional view of the scroll compressor, and FIG. 11 shows a state of the scroll compressor of FIG. FIG. 11 is an explanatory diagram corresponding to FIG. 10. In the figure, the same reference numerals as those in FIGS. 1 to 7 described above indicate corresponding parts, and 21 is a refrigerant suction pipe, and a drooping part 41 bent downward from an opening 41 arranged near the compression mechanism 2 of the closed container 1 is provided. The lower end of the hanging portion 41 is bent again upward, and the volume expanding portion 42 is formed at a position lower than the position corresponding to the compression mechanism 2 at this position.

In the compressor configured as described above,
When the liquid refrigerant 30 enters the compressor, the refrigerating machine oil 20 having a weak compatibility at most with the refrigerant stays above the liquid refrigerant 30. When a larger amount of the liquid refrigerant 30 enters the compressor and the upper surface of the 20 layers of the refrigerating machine oil reaches the opening 40 of the refrigerant suction tube 21, the refrigerating machine oil 20 is cooled.
Flow into.

Then, the inflowing refrigerating machine oil 20 fills the volume expanding portion 42, and the liquid level becomes the same as that in the closed container 1. As a result, the refrigerating machine oil 2 necessary for lubricating the compression mechanism 2
Zero amount is stored in the volume expansion section 42. The state when the compressor is activated is as shown in FIG.

That is, the refrigerator oil 20 near the compression mechanism 2
Further, the liquid refrigerant 30 flows out of the compressor in a short time, and the refrigerating machine oil 20 stored in the volume expansion section 42 is sucked into the compressor. At this time, since the liquid level in the compressor has decreased, the refrigerating machine oil 20 in the volume expansion part 42 stays in the compressor without flowing out of the compressor.

Further, the volume of the volume expanding portion 42 is set to the oil reservoir portion 1
In addition to the volume from the bottom surface of the closed container 1 to the lower end of the suction pipe 24 of the oil supply pump 23 in 9, the amount of refrigerating machine oil 20 required for lubrication of each sliding portion of the compression mechanism 2 is made larger. Thereby, the refrigerating machine oil 20 stored in the volume expanding section 42
Can be retained in the compressor without flowing out of the compressor to obtain the required lubricating action. Then, the same operation as that of the embodiment shown in FIGS. 1 to 7 can be obtained.

Embodiment 5. FIG. 12 is also a vertical sectional view of a scroll compressor showing an example of another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 10 and FIG. 11 described above indicate corresponding parts, and 21 is a refrigerant suction pipe, which is bent upward from an opening 41 opened to the oil reservoir 19 of the closed container 1 and has a volume above it. An expansion section 42 is provided. The volume expansion section 42 is arranged below the position corresponding to the compression mechanism 2.

Also in the compressor configured as described above, a detailed description thereof will be omitted by providing the volume expanding portion 42 having the same volume as that of the embodiment of FIGS. 10 and 11, but the detailed description of FIG. 10 and 1 also in the embodiment.
An effect similar to that of the first embodiment can be obtained. It should be noted that the refrigerant suction pipe 21 is appropriately extended in a detour manner without increasing its cross-sectional area, and a volume equivalent to the volume expansion portion 42 for storing the refrigerating machine oil 20 sufficient for lubricating the compressor is provided in the refrigerant suction pipe 21. Secure. As a result, the same operation as that of the embodiment shown in FIG. 12 can be obtained.

Sixth Embodiment FIG. 13 is also a vertical cross-sectional view of a scroll compressor showing an example of another embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 10 and 11 described above indicate corresponding parts, and 21 is a refrigerant suction pipe, which is spirally formed on the outer surface of the closed container 1 from an opening 41 opened toward the compression mechanism 2 of the closed container 1. And is bent upward at the lower end of the closed container 1. Reference numeral 43 denotes a volume expansion portion in which the refrigerant suction pipe 21 is spirally wound and extended around the outer circumference of the closed container 1 without increasing the cross-sectional area.

Also in the compressor configured as described above, a detailed description thereof will be omitted by providing the volume expanding portion 43 having the same volume as that of the embodiment of FIGS. 10 and 11, but the detailed description of FIG. 10 and 1 also in the embodiment.
An effect similar to that of the first embodiment can be obtained.

Embodiment 7. In the embodiment of FIG. 13, the refrigerant suction pipe 21 is formed by spirally winding the outer surface of the closed container 1 upward from the opening 41 opened in the oil reservoir 19 of the closed container 1 without increasing the cross-sectional area. Further, the volume expanding portion 43 is formed by being extended by the spiral portion of the refrigerant suction pipe 21. Also in the compressor having such a configuration, by providing the volume expanding portion 43 having the same volume as that of the embodiment of FIGS. 10 and 11, the detailed description is omitted, but the embodiment of FIGS. The same effect as the form can be obtained.

[0061]

As described above, according to the present invention, the compression mechanism for delivering the compressed refrigerant gas to the outside, which is arranged in the closed container, and the refrigerant stored in the bottom portion of the closed container for the refrigerant at most. Refrigerating machine oil having a weak compatibility, an oil supply pump having the lower end of the suction pipe arranged in the refrigerating machine oil to supply the refrigerating machine oil to the compression mechanism, and a suction pipe of the oil supply pump provided at the bottom of the closed container at the center. And a partition body having an annular side surface having a space corresponding to, a side surface hanging from the edge of the upper surface, and having a gap formed between the lower end portion and the bottom surface of the closed container,
One end is opened to the upper part of the partition body, and the outside of the partition body is bent downward, and the other end is provided with a gas vent pipe arranged at an intermediate position of side height.

As a result, the partition body eliminates the phenomenon that the entire amount of the refrigerating machine oil is pushed up to the vicinity of the compression mechanism when the amount of the liquid refrigerant accumulated in the lower part of the closed container increases. Further, when the compressor is started, the entire amount of refrigerating machine oil flows out of the closed container, the suction pipe opening of the oil supply pump becomes only liquid refrigerant, and only the low-viscosity liquid refrigerant is supplied to each bearing of the compression mechanism. Problems can be resolved.

Therefore, it is possible to prevent the occurrence of a failure due to the fact that the liquid refrigerant finally vaporizes and the lubrication action becomes insufficient, and when a refrigerating machine oil which is at most weakly compatible with the refrigerant is used. Also has a normal lubrication effect, which has the effect of preventing a compressor inoperable accident.

Further, as described above, the present invention is provided at the center of the hermetically sealed container, and the side surface is disposed so as to form a space between the inner peripheral surface of the hermetically sealed container and the suction surface of the oil supply pump. The pipe is provided with a partition body arranged in an inserted state.

With this, the phenomenon that the total amount of the refrigerating machine oil is pushed up to the vicinity of the compression mechanism when the amount of the liquid refrigerant accumulated in the lower part of the closed container increases is eliminated by the partition body. Further, when the compressor is started, the entire amount of refrigerating machine oil flows out of the closed container, the suction pipe opening of the oil supply pump becomes only liquid refrigerant, and only the low-viscosity liquid refrigerant is supplied to each bearing of the compression mechanism. Problems can be resolved.

Therefore, it is possible to prevent the occurrence of a failure due to the liquid refrigerant finally vaporizing and the lack of lubrication, and when using a refrigerating machine oil which is at most weakly compatible with the refrigerant. Also has a normal lubrication effect, which has the effect of preventing a compressor inoperable accident. Further, since the suction pipe of the oil supply pump is arranged in the compartment, the refrigerating machine oil can be more reliably supplied to the compression mechanism, and the normal lubrication action is obtained, which has the effect of preventing the compressor inoperable accident. .

In addition, as described above, the present invention has a compression mechanism which is arranged in a closed container and sends out a compressed refrigerant gas to the outside, and at most the refrigerant stored in the bottom of the closed container against the refrigerant. Refrigerating machine oil having a weak compatibility, a lower end of the suction pipe is placed in the refrigerating machine oil, an oil supply pump for supplying the refrigerating machine oil to the compression mechanism, a refrigerant suction pipe provided in a closed container for sucking a refrigerant gas, and The refrigerant suction pipe is provided with a volume expansion portion disposed below the compression mechanism position.

As a result, when the liquid refrigerant enters the compressor, the refrigerating machine oil stays above the liquid refrigerant, but when a large amount of the liquid refrigerant enters the compressor, the refrigerating machine oil flows into the refrigerant suction pipe. Then, the volume expansion part is filled up and the amount of refrigerating machine oil necessary for lubricating the compression mechanism is stored. Then, when the compressor is activated, the refrigerating machine oil and the liquid refrigerant near the compression mechanism flow out of the compressor in a short time, and the refrigerating machine oil in the volume expansion part is sucked into the compressor and stays in the compressor.

Then, the volume of the volume expanding portion is made larger than the amount of refrigerating machine oil required for lubricating each sliding portion of the compression mechanism. As a result, the refrigerating machine oil stored in the volume expansion part can be retained in the compressor without flowing out of the compressor to obtain a desired lubricating action. Therefore, it is possible to prevent the occurrence of a failure due to insufficient lubrication action, a normal lubrication action can be obtained even when a refrigerating machine oil that is at most weakly compatible with the refrigerant is used, and the compressor It has the effect of preventing inoperable accidents.

Further, as described above, the present invention has a compression mechanism which is placed in a closed container and sends out a compressed refrigerant gas to the outside, and at the bottom of the closed container, the compression mechanism stores at most the refrigerant. Refrigerating machine oil having a weak compatibility, a lower end of the suction pipe is placed in the refrigerating machine oil, an oil supply pump for supplying the refrigerating machine oil to the compression mechanism, a refrigerant suction pipe provided in a closed container for sucking a refrigerant gas, and The refrigerant suction pipe is extended in a detour manner, and a volume expanding portion formed below the position of the compression mechanism is provided.

As a result, when the liquid refrigerant enters the compressor, the refrigerating machine oil stays above the liquid refrigerant, but when a large amount of the liquid refrigerant enters the compressor, the refrigerating machine oil flows into the refrigerant suction pipe. Then, the volume expansion part is filled up and the amount of refrigerating machine oil necessary for lubricating the compression mechanism is stored. Then, when the compressor is activated, the refrigerating machine oil and the liquid refrigerant near the compression mechanism flow out of the compressor in a short time, and the refrigerating machine oil in the volume expansion part is sucked into the compressor and stays in the compressor.

Then, the volume of the volume expansion portion formed by extending the refrigerant suction pipe is made larger than the amount of refrigerating machine oil required for lubricating each sliding portion of the compression mechanism. As a result, the refrigerating machine oil stored in the volume expansion part can be retained in the compressor without flowing out of the compressor to obtain a desired lubricating action. Therefore, it is possible to prevent the occurrence of a failure due to insufficient lubrication action, a normal lubrication action can be obtained even when a refrigerating machine oil that is at most weakly compatible with the refrigerant is used, and the compressor It has the effect of preventing inoperable accidents.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention and is a vertical cross-sectional view of a scroll compressor.

FIG. 2 is an enlarged vertical cross-sectional view of a main part of the scroll compressor shown in FIG. 1 for explaining the states of the refrigerant and the refrigerating machine oil in the oil reservoir of the closed container.

FIG. 3 is an enlarged vertical cross-sectional view of a main part of the scroll compressor of FIG. 1, illustrating another state of the refrigerant and the refrigerating machine oil in the oil reservoir of the closed container.

FIG. 4 is an enlarged vertical cross-sectional view of a main part of the scroll compressor shown in FIG. 1, which illustrates another state of the refrigerant and the refrigerating machine oil in the oil reservoir of the closed container.

FIG. 5 is an enlarged vertical cross-sectional view of a main part of the scroll compressor of FIG. 1, illustrating another state of the refrigerant and the refrigerating machine oil in the oil reservoir of the closed container.

FIG. 6 is an enlarged vertical cross-sectional view of a main part of the scroll compressor of FIG. 1, illustrating another state of the refrigerant and the refrigerating machine oil in the oil reservoir of the closed container.

FIG. 7 is an enlarged vertical cross-sectional view of a main part of the scroll compressor of FIG. 1, illustrating another state of the refrigerant and the refrigerating machine oil in the oil reservoir of the closed container.

FIG. 8 is a view showing the second embodiment of the present invention and is a vertical cross-sectional view of an oil reservoir portion of the scroll compressor.

FIG. 9 is a view showing the third embodiment of the present invention and is a vertical cross-sectional view of an oil reservoir portion of the scroll compressor.

FIG. 10 is a view showing a fourth embodiment of the present invention and is a vertical cross-sectional view of a scroll compressor.

11 is a diagram illustrating a state of the scroll compressor of FIG. 10 at the time of starting the compressor, which is equivalent to FIG.

FIG. 12 is a view showing a fifth embodiment of the present invention and is a vertical cross-sectional view of a scroll compressor.

FIG. 13 is a view showing the sixth embodiment of the present invention and is a vertical cross-sectional view of a scroll compressor.

FIG. 14 is a vertical cross-sectional view of a scroll compressor showing a conventional compressor.

FIG. 15 is a view showing another conventional compressor, which is a vertical cross-sectional view of the lower end portion of the scroll compressor.

FIG. 16 is a view for explaining a state of an oil reservoir of a conventional compressor when a liquid refrigerant having no mutual solubility and refrigerating machine oil are used, and is a front view showing a part of the compressor in a longitudinal section.

FIG. 17 is a view for explaining another state of the oil reservoir of the conventional compressor when a liquid refrigerant having no mutual solubility and refrigerating machine oil are used, and is a front view showing the compressor in a longitudinal section.

[Explanation of symbols]

1 airtight container, 2 compression mechanism, 20 refrigerator oil, 21
Refrigerant suction pipe, 23 Oil supply pump, 24 Suction pipe, 31
Partition, 32 upper surface, 33 side surface, 34 void, 35
Gas vent pipe, 42 volume expansion part, 43 volume expansion part.

Front page continued (72) Inventor Kazuyuki Akiyama 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Inventor Shin Sekiya 2-3-3, Marunouchi, Chiyoda-ku, Tokyo Sanryo Denki Within the corporation

Claims (4)

[Claims] 1. A compression mechanism which is arranged in a closed container and sends out a compressed refrigerant gas to the outside, and a refrigerating machine oil which is stored at the bottom of the closed container and has a weak compatibility at most with the refrigerant. A lower end of the suction pipe is placed in the refrigerating machine oil to supply the refrigerating machine oil to the compression mechanism; and a space provided at the bottom of the closed container corresponding to the suction pipe in the center. And a side wall that forms an annular shape and is formed so as to hang down from the edge of the upper surface, and a space is formed between the lower end portion and the bottom surface of the closed container, and one end opens at the top of the partition body. A compressor provided with the outside of the partition body bent downward, and the other end having a gas vent pipe arranged at an intermediate position of the lateral height. 2. A hermetically sealed container is provided at a central portion thereof, and a side surface thereof is disposed so as to form a space between the side surface and the inner circumferential surface of the hermetically sealed container.
The compressor according to claim 1, wherein the upper surface of the compressor is a partition body in which an intake pipe of an oil supply pump is inserted. 3. A compression mechanism arranged in a closed container for delivering compressed refrigerant gas to the outside, and a refrigerating machine oil stored at the bottom of the closed container and having a weak compatibility at most with the refrigerant. And a lower end of the suction pipe disposed in the refrigerating machine oil to supply the refrigerating machine oil to the compression mechanism, a refrigerant suction pipe provided in the closed container for sucking a refrigerant gas, and the refrigerant suction pipe. And a volume expansion portion provided below the compression mechanism position. 4. A compression mechanism arranged in a closed container for delivering compressed refrigerant gas to the outside, and a refrigerating machine oil stored at the bottom of the closed container and having a weak compatibility at most with the refrigerant. And a lower end of the suction pipe disposed in the refrigerating machine oil to supply the refrigerating machine oil to the compression mechanism, a refrigerant suction pipe provided in the closed container for sucking a refrigerant gas, and the refrigerant suction pipe. And a volume expanding portion formed below the position of the compression mechanism.