JPH06294380A - Closed-type compressor - Google Patents

Abstract

PURPOSE:To prevent poor supply oil and excessive supply oil by always supplying the optimum amount of oil regardless of driving pressure conditions in supplying oil into a cylinder of a closed-type compressor. CONSTITUTION:A closed-type compressor is composed of a closed container 2, an electrically driven compression element 8 housed in the closed container 2, and composed of a compression element 6 and an electrically-driven element 7, a lubricating oil sump 19 provided on the compression element 6 and a suction pipe 18 whose one end is communicated with the compression element 6 while the other end is opened near the lubricating oil sump 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in a refrigerating machine or the like, and more particularly to an oil supply mechanism.

[0002]

2. Description of the Related Art A conventional method for refueling a cylinder with a compression element in a hermetic compressor is disclosed in JP-A-52-260.
The oil grooves and oil capillaries shown in Japanese Patent Publication No. 06-2006 are known. Hereinafter, an example of the above-described conventional oil supply method will be described with reference to the drawings.

A conventional configuration is shown in FIGS. Figure 1
FIG. 1 is a vertical sectional view of a conventional hermetic compressor. 12
[FIG. 7] is a sectional view of a principal part taken along line C-C of the conventional example.

In FIGS. 11 and 12, 2 is a closed container, 6
Is a compression element elastically supported in the closed container 2, and 7 is an electric element arranged above the compression element 6. Reference numeral 20 is a suction muffler, 17 is a cylinder head, and 24 is a communication pipe. The suction muffler 20 is fixed by pressing a spring washer 25 and a communication pipe 24 into the cylinder head 17. Reference numeral 26 is an insertion tube which is inserted into the suction muffler 20. 27 is a suction hole, and 10 is a cylinder.

28 has one end 28a connected to the compression element 6,
The other end 28b is an oil capillary immersed in the lubricating oil 21 accumulated at the bottom of the closed container 2.

Regarding the compressor configured as described above,
The operation will be described below. First, by the electric element 7,
Refrigerant gas is sucked into the suction muffler 20 from the external cooling circuit (not shown) to the driven compression element 6 through the insertion pipe 26. Then, this refrigerant gas is sucked into the cylinder head 17 through the communication pipe 24, and the suction hole 27
It is led to the cylinder 10 through. Since the refrigerant gas flows in this suction stroke, the pressure (static pressure) in the compression element 6 such as the cylinder 10 and the cylinder head 17 is lower than the pressure in the closed container 2, and due to this pressure difference, Lubricating oil is supplied to the compression element 6.

[0007]

However, in the above-mentioned conventional configuration, the amount of oil supply varies depending on the operating pressure condition. For this reason, when the pressure difference is small, there is a problem that the amount of oil supply is small and the efficiency decreases and seizure due to oil shortage occurs. Further, when the pressure difference is large, there is a problem that the amount of oil supply increases and excessive compression occurs due to excessive lubricating oil.

The present invention solves the problems of the prior art, and always provides proper lubrication regardless of the operating pressure conditions, resulting in reduced efficiency and reliability due to insufficient lubrication, and excessive lubrication due to excessive lubrication. The purpose is to prevent compression.

[0009]

In order to achieve this object, a hermetic compressor of the present invention has a lubricating oil reservoir provided in a compression element, one end of which is connected to the compression element, and the other end of which is in the vicinity of the lubricating oil reservoir. It is composed of an open suction pipe.

The suction pipe has one end connected to the compression element and the other end near the opening is in contact with or close to the compression element.

The opening is cut obliquely, and the end face of the opening is opened in the direction opposite to the direction of gravity.

Further, it has a structure in which a small hole is provided near the opening of the suction pipe.

[0013]

The hermetic compressor of the present invention has the above-mentioned structure and is caught in the flow of the refrigerant sucked into the suction pipe,
Since the lubricating oil stored in the lubricating oil sump is sucked, it is possible to constantly supply a fixed amount of oil regardless of the pressure conditions.

Further, since the vicinity of the opening of the suction pipe is in contact with or close to the compression element, the lubricating oil scattered in the closed container can be retained near the opening of the suction pipe. Lubricating oil can be supplied from the suction pipe, and excessive compression due to excessive suction can be prevented.

Further, since the suction pipe opening is obliquely cut and the end face of the opening is opened in the direction opposite to the direction of gravity, the lubricating oil accumulated between the suction pipe and the compression element is sucked into the suction pipe by its own weight. Is surely sucked in.

Further, since the small hole is provided in the vicinity of the opening of the suction pipe which is in contact with or close to the compression element, the refrigerant flows toward the opening even when the refrigerant flows backward in the suction pipe. It is possible to prevent the lubricating oil accumulated in the vicinity from being blown out, and the lubricating oil is surely sucked into the suction pipe through the small hole.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the related art will be denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a vertical sectional view of a hermetic compressor according to a first embodiment of the present invention. FIG. 2 is a top view of the compression element portion of the embodiment. FIG. 3 is a sectional view taken along the line AA of FIG.

In FIGS. 1, 2, and 3, reference numeral 6 is a compression element, which is a cylinder 1 provided integrally with the block 9.
0, piston 11, crankshaft 12, connecting rod 13,
The bearing 14 and the like are used. Reference numeral 19 denotes a lubricating oil sump, which is provided on the compression element 6. Reference numeral 18 is a suction pipe, one end 18b is connected to the compression element 6, and the opening 18a at the other end is opened in the vicinity of the lubricating oil sump 19.

The operation of the hermetic compressor constructed as above will be described below. The crankshaft 12 is immersed in the lubricating oil 21 having one end 12a stored in the bottom portion of the pressure vessel 2 and driven by the electric element 7 to generate the crankshaft 1.
An oil supply mechanism (not shown) provided in the inside 2 mainly supplies oil to the sliding portion 12c of the crankshaft 12 and the bearing 14. After that, the lubricating oil 21 is discharged from the crankshaft 12 into the closed container 2, and the lubricating oil 21 is scattered in the space inside the closed container 2. The lubricating oil 21 adheres to the compression element 6 and is stored in the lubricating oil sump 19 by its own weight or the like.

In the suction stroke, the refrigerant gas is sent into the closed container 2 from an external cooling circuit (not shown),
The refrigerant gas in the closed container 2 is sucked into the cylinder 10 via the suction pipe 18. At this time, the lubricating oil 21 that has been caught in the flow of the refrigerant gas and stored in the lubricating oil sump 19 is sucked into the suction pipe 18 through the suction pipe opening 18a opened near the oil surface of the lubricating oil sump 19. Then, the lubricating oil 21 is guided to the cylinder 10 through the suction muffler 20 and the cylinder head 17 together with the refrigerant gas, and is supplied to the cylinder 10, the piston 11, and the like.

Therefore, since the pressure difference is not used for the oil supply into the cylinder 10, it is possible to always supply a fixed amount of the lubricant oil into the cylinder 10 without being influenced by the operating conditions.

As described above, the hermetic compressor of this embodiment is
The lubricating oil sump 19 provided in the compression element 6 and the suction pipe 18 having one end connected to the compression element 6 and the other end opened near the lubricating oil sump 19 affect the operating pressure conditions. Without always supplying a fixed amount of lubricating oil 21 to the cylinder 1
It can be supplied within 0.

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. 4 is a vertical sectional view of a hermetic compressor according to a second embodiment of the present invention. FIG. 5: is a top view of the compression element part of the same Example. FIG. 6 is a sectional view taken along the line BB of FIG.

In FIGS. 4, 5, and 6, reference numeral 18 is a suction pipe, one end 18b is connected to the compression element, and the opening vicinity 18a at the other end is close to the cylinder head 17 of the compression element 6.

The operation of the hermetic compressor constructed as above will be described below. The lubricating oil 21 scattered in the closed container 2 adheres to the compression element 6. Therefore, the lubricating oil 21 also adheres to the cylinder head 17 and the suction pipe 18, and the lubricating oil 21 collects in the gap between the cylinder head 17 and the suction pipe 18. The lubricating oil 21 collected in the gap between the cylinder head 17 and the suction pipe 18 is caught in the flow of the refrigerant gas flowing into the suction pipe 18,
The oil is sucked into the suction pipe 18 through the opening 18a and guided to the cylinder 10 for oil supply.

The amount of the lubricating oil 21 accumulated in the gap between the cylinder head 17 and the suction pipe 18 does not accumulate so much as the amount of oil supplied to the cylinder 10 is too large. Therefore, the amount of oil supplied to the cylinder 10 can be made constant without being affected by the operating pressure condition, and an excessive amount of lubricating oil can be prevented from being supplied into the cylinder 10 via the suction pipe 18 to prevent overcompression. It can be prevented.

As described above, the hermetic compressor of this embodiment is
One end is connected to the compression element 6 and the other end is a suction pipe opening 18a
Suction pipe 18 whose vicinity is in contact with or close to the compression element 6
Therefore, it is possible to always supply a fixed amount of the lubricating oil 21 to the cylinder 10 without being affected by the operating pressure condition, and it is possible to prevent an excessive amount of lubricating oil from being supplied to the cylinder 10 from the suction pipe. It is possible to prevent over compression.

In the present embodiment, the suction pipe opening is arranged close to the cylinder head, but it goes without saying that it may be arranged in contact with or close to other components of the compression element such as a block. .

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. 7 is a vertical sectional view of a hermetic compressor according to the third embodiment of the present invention. FIG. 8 is a top view of the compression element portion in the embodiment.

In FIGS. 7 and 8, reference numeral 22 is a suction pipe, and the end face 22a of the opening of the suction pipe 22 is cut obliquely so that the end face of the opening is opened in the direction opposite to the direction of gravity.

The operation of the hermetic compressor constructed as described above will be described below. Similar to the second embodiment,
The lubricating oil 2 is placed in the gap between the cylinder head 17 and the suction pipe 22.
1 is accumulated. Since the opening end surface 22a of the suction pipe 22 opens in the direction opposite to the gravity direction, the cylinder head 17
The lubricating oil 21 accumulated in the gap between the suction pipe 22 and the suction pipe 22 surely flows into the suction pipe 22 by its own weight, and is caught in the flow of the refrigerant gas flowing into the suction pipe 22, and then from the suction pipe 22 to the cylinder 10. Guided to refuel.

Therefore, the amount of oil supplied to the cylinder 10 can be made constant without being affected by the operating pressure condition, and an excessive amount of lubricating oil is supplied into the cylinder 10 via the suction pipe 22 to cause overcompression. Can be prevented, and moreover, refueling can be reliably performed, so that it is possible to prevent a decrease in efficiency and a decrease in reliability due to a shortage of refueling amount.

As described above, the hermetic compressor of this embodiment is
Since the end face 22a of the opening portion is composed of the suction pipe 22 which is inclined and opened in the direction opposite to the gravity direction, the cylinder 1
The amount of oil supplied to 0 can be made constant without being affected by the operating pressure condition, and an excessive amount of lubricating oil can be supplied from the suction pipe 22 to the cylinder 1
0, it is possible to prevent overcompression, and the accumulated lubricating oil can be reliably sucked into the suction pipe, so that it is possible to prevent a decrease in efficiency and a decrease in reliability due to an insufficient amount of oil supply. .

Next, a fourth 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. 9 is a vertical sectional view of a hermetic compressor according to the fourth embodiment of the present invention. FIG. 10 is a sectional view of the main part of the suction pipe of the same embodiment.

In FIGS. 9 and 10, 23 is a suction pipe, and 23a is a small hole provided in the vicinity of the opening 23b of the suction pipe 23.

The operation of the hermetic compressor constructed as described above will be described below. Similar to the second embodiment,
The lubricating oil 21 collects in the gap between the cylinder head 17 and the suction pipe 23. The lubricating oil 21 is caught in the flow of the refrigerant gas flowing into the suction pipe 23, and the opening 23 of the suction pipe 23
It flows into the suction pipe 23 through a small hole 23a near b and is guided to the cylinder 10 for oil supply.

In addition, a backflow of the refrigerant gas may occur in the suction pipe 23 during the suction stroke of the compressor, and the lubricating oil near the opening 23b may be blown off. However, since the refrigerant gas flowing backward flows toward the suction pipe opening 23b having a smaller flow resistance than the small hole 23a, the lubricating oil staying in the vicinity of the small hole 23a is not blown off. Therefore, the lubricating oil 21 accumulated in the vicinity of the small hole 23a can be constantly supplied to the cylinder 10 via the suction pipe 23.

Therefore, a constant amount of lubricating oil can always be supplied into the cylinder 10 without being affected by the operating pressure condition, and an excessive amount of lubricating oil can be supplied into the cylinder 10 via the suction pipe 23. It is possible to prevent over compression. Further, the lubricating oil 21 that has accumulated in the vicinity of the small holes 23a can always refuel even if the refrigerant gas flows backward in the suction stroke, so that the refueling is surely performed, and the efficiency is reduced and the reliability is reduced due to the insufficient refueling amount. It is possible to prevent deterioration of sex.

As described above, the hermetic compressor of this embodiment is
Since the suction pipe 23 is provided with the small hole 23b in the vicinity of the opening 23b of the suction pipe 23, the cylinder 10 can be refueled without being affected by operating pressure conditions, and an excessive amount of lubricating oil can be provided. Supply from the suction pipe 23 to the cylinder 10 can be prevented, and overcompression can be prevented. Furthermore, even if the refrigerant gas flows backward in the suction stroke,
Since the lubricating oil staying in the vicinity of the small hole 23a is not blown off, the staying lubricating oil can be reliably sucked into the suction pipe 23 through the small hole 23a.

In this embodiment, the small hole 2 is formed in the suction pipe 23.
Although 3a is provided, it goes without saying that a groove or a mesh portion may be provided in the suction pipe 23 instead of the small hole 23a.

[0045]

As described above, the present invention comprises the lubricating oil reservoir provided in the compression element, and the suction pipe having one end connected to the compression element and the other end opened in the vicinity of the lubricating oil reservoir. Therefore, it is possible to always supply a fixed amount of lubricating oil into the cylinder without being affected by the operating pressure conditions.

Further, since one end is connected to the compression element and the other end near the opening is composed of the suction pipe which is in contact with or close to the compression element, an excessive amount of lubricating oil is supplied from the suction pipe to the cylinder. Can be prevented, and over-compression can be prevented.

Further, since the end face of the opening is formed by the suction pipe which is inclined and opened in the direction opposite to the direction of gravity, the lubricating oil attached to the compression element and accumulated in the vicinity of the suction pipe can be surely sucked. Since reliable oil supply can be performed, it is possible to prevent a decrease in efficiency and reliability due to a shortage of oil supply.

Further, even when the refrigerant gas flows backward in the suction pipe, the lubricating oil can always be retained in the vicinity of the small holes, and the oil can be constantly fed into the cylinder through the suction pipe.

[Brief description of drawings]

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

FIG. 2 is a top view showing a compression element portion of the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a cross-sectional view of a hermetic compressor showing a second embodiment of the present invention.

FIG. 5 is a top view showing a compression element portion of the embodiment.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a vertical sectional view of a hermetic compressor showing a third embodiment of the present invention.

FIG. 8 is a top view showing the compression element portion of the embodiment.

FIG. 9 is a vertical sectional view of a hermetic compressor showing a fourth embodiment of the present invention.

FIG. 10 is a sectional view of a main part of an intake pipe showing a fourth embodiment of the present invention.

FIG. 11 is a vertical sectional view of a conventional hermetic compressor.

FIG. 12 is a cross-sectional view of the principal part taken along the line CC of the conventional example.

[Explanation of symbols]

 2 Airtight container 5 Electric compression element 6 Compression element 7 Electric element 18 Suction pipe 18a Suction pipe opening 19 Lubricating oil reservoir 22 Suction pipe 22a Suction pipe end face 23 Suction pipe 23a Small hole 23b Suction pipe opening

Claims (4)

[Claims] 1. An airtight container, an electric compression element housed in the airtight container and composed of a compression element and an electric element, a lubricating oil reservoir provided on the compression element, one end of which is connected to the compression element, and the other end of which is connected. A hermetic compressor comprising a suction pipe opened near the lubricating oil sump. 2. An airtight container, an electric compression element housed in the airtight container and composed of a compression element and an electric element, one end of which is connected to the compression element and the vicinity of the opening at the other end is in contact with the compression element or A hermetic compressor consisting of a suction pipe in close proximity. 3. The hermetic compressor according to claim 2, wherein the opening is cut obliquely, and the suction end has an end surface that opens in a direction opposite to the direction of gravity. 4. The hermetic compressor according to claim 2, comprising a suction pipe having a small hole near the opening.