JPS6030494A - Full enclosed compressor - Google Patents

Abstract

PURPOSE:To prevent agitating loss owing to lack of lubricant oil or excessive oil by refilling the oil when the oil level in the chamber of a compressor is too low by means of provision of an oil level controller, collecting the oil if it is too high, and thereby retaining always the oil level properly. CONSTITUTION:When the oil level in No.1 oil sump 15 has sunk below a float 25 -i.e., when it is lower than the lower limit of the range for specified values - a valve port 37 opens and valve port 38 closes. At this time, a valve chest 39 in connection with a low pressure port 21 is put in communication with a valve chest 35 in connection with an intermediate pressure port 22, and the oil flows from No.2 oil sump to a suction/delivery pipe 9 via piping, intermediate pressure port 22, passage 40, valve chest 35, valve port 37, valve chest 39, low pressure port 21 and piping, to return finally to No.1 oil sump 15 so as to cause rise of the oil level. In case the oil level in the oil sump 15 is too high, on the other hand, the oil in the oil sump 15 flows toward oil sump as contrarily to the above to sink the oil level in the oil sump 15 so as to cause retention of the proper oil level. Thereby loss owing to lack of lubricant oil or excessive oil can be prevented.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a completely hermetic compressor, and in particular to a completely hermetic compressor equipped with an oil level height control device suitable for a scroll compressor for use in an air conditioner. It is related to compressors.

[Background of the invention]

Conventionally, reciprocating compressors and rotary hermetic compressors are often used in air conditioners of medium capacity or less. Recently, scroll compressors have also been put into practical use. However, rotary type or Nucroll type hermetic compressors with a high pressure chamber that generates discharge pressure inside the chamber,
Compared to the reciprocating type with a low-mo chamber type, there is more oil rising during operation, and a large amount of oil may leak into units such as air conditioners, especially when there is a sudden pressure change such as when switching to sheathing mode during heating operation. be. At this time, the inside of the chamber is temporarily depleted of oil until the oil returns from the suction side, which may impede the lubrication of bearings and the like. The easiest way to prevent temporary deterioration of the curved surface is to install an oil separator between the compressor discharge pipe and the heat exchanger and return the separated oil to the suction pipe, but in the long term Oil that cannot be separated by the oil separator constantly accumulates in the unit and becomes saturated in a certain amount. At this time, if the piping of the unit is long, the amount of oil in the compressor may become insufficient.

On the other hand, if a slightly larger amount of oil is sealed in anticipation of a drop in the oil level, the curved surface will be too high when the predicted oil level does not rise, resulting in increased agitation loss in the rotating parts and a decrease in compressor efficiency. . The oil separator has no adjustment function if the oil level is too high.

Therefore, we will use a general closed scroll pruning machine as an example.
The prior art will be explained with reference to FIG.

FIG. 1 is a longitudinal sectional view of a conventional hermetic scroll compressor.

Compression elements, mainly consisting of a fixed scroll 2, an orbiting scroll 3, and a frame 5, and an electric motor 8 are housed in the closed chamber 1, connected to each other via a crankshaft 6.

The fixed scroll 2 and the orbiting scroll 3 each have a spiral wrap (not shown) vertically erected on an end plate, and are formed into mutually symmetrical shapes and are engaged with each other. When the crankshaft 6 rotates, the orbiting scroll 3 is connected to the crankshaft 6.
The mechanism of the Oldham ring 4 allows it to rotate without rotating. Then, the symmetrical compression chamber 10ax 11 surrounded by the wraps of both scrolls gradually moves toward the inner periphery and reduces its volume, so that a compression action is performed. Inside the frame 5 on the back side of the orbiting scroll 3 is a chamber 14 in an intermediate pressure region, which communicates with a compression chamber at a certain appropriate pressure through small holes 3b3c provided in the orbiting scroll mirror plate 3a. The value is approximately equal to the average value of the pressure in the compression chamber. Due to this pressure, the orbiting scroll 3
is in close contact with the fixed scroll 2 to eliminate gaps in the axial direction and prevent leakage between compression chambers.

The crankshaft 6 and the end plate part 3a of the orbiting scroll 3 are each provided with a volume of oil for lubricating the sliding parts. The sliding parts etc. are lubricated.

Gas is drawn into the compression element from the suction pipe 9, compressed, and discharged from the discharge bow 2a into the upper discharge chamber 11, flows downward from the passage 12, and then discharged from the discharge pipe 13 to the outside of the chamber.

Note that the centrifugal force of the orbiting scroll is balanced by a balance weight 7.

In such a completely hermetic scroll compressor, there is often a problem that the oil in the oil reservoir 15 flows out from the discharge pipe 13 together with the gas due to the oil rising phenomenon described above, causing the oil level to drop. It became.

When the oil level decreases, as mentioned above, it becomes difficult to supply oil to the lubricating parts, causing accidents such as seizure. In addition, if the curved surface is too high, there is a problem in that the stirring loss of rotating parts such as the electric motor 8 and the crankshaft 6 increases and the efficiency of the compressor decreases.

[Purpose of the invention]

The present invention was made in order to solve the problems of the conventional technology, and it maintains the oil level in the chamber of the compressor at an appropriate level at all times, thereby preventing poor lubrication due to insufficient oil or excessive oil. The purpose is to provide a completely hermetic compressor that prevents agitation loss in rotating parts and is highly reliable for oil-based compressors.

[Summary of the invention]

A completely hermetic compressor according to the present invention has a configuration in which an electric element and a compression element are housed in a chamber, and a suction pipe and a discharge pipe are provided, and an oil reservoir is further provided in the chamber. , a first oil sump within the chamber;
A second oil reservoir provided separately from this oil reservoir, and the first oil reservoir.
means for detecting the oil level height of the oil sump; a valve device that operates by detecting the height of the curved surface; a passage connecting the valve device and the first oil sump; a passageway connecting the second oil reservoir and a passageway connecting the valve device and the suction piping, and when the oil level height of the first oil reservoir is lower than a set value range, the valve device The first valve opens and the second
When the passage connecting the oil sump and the suction pipe is in communication and the oil level height of the first oil sump is higher than the set value range, the second valve of the valve device opens and the first oil sump is opened. When the passage connecting the oil sump and the second oil sump communicates, and the oil level height of the first oil sump is within the set value range, either the first or second valve is closed. It looks like it's closed.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 2 to 5.

FIG. 2 is a longitudinal sectional view of a hermetic scroll compressor according to an embodiment of the present invention, and the same reference numerals as in FIG. 1 indicate parts equivalent to those of the prior art. 3 is a sectional view taken along the line A-A in FIG. 2, and FIGS. 4 and 5 are longitudinal sectional views of an oil level control device portion according to an embodiment of the present invention.

In the figure, an inner wall 16 is provided at the bottom of the chamber 1, and there is a first oil sump 15 for supplying oil, and a second oil sump 26 is provided at the bottom, separated from the tenth oil sump 15. It is being

Near the oil level of the first oil reservoir 15, a valve device 20 and a float 25 are disposed via an arm 24 to the valve device 20.

The valve device 20 is provided with a low pressure port 21, an intermediate pressure boat 22, and a high pressure port 23, and the low pressure port 21 is connected to the piping 2i.
It is connected to the suction pipe 9 with &. The intermediate pressure port 22 is connected to the bottom of the second oil reservoir 26 through a pipe 22a. The high pressure port 23 is open to the oil in the second oil reservoir 15.

Further, the upper region 26' of the second oil reservoir 26 communicates with the intermediate pressure region 14 within the frame 5 through a pipe 27.

The valve device 20, float 25, and arm 24 are arranged so as to avoid the coil end 8a of the electric motor 8, as shown in FIG.

The valve device 2nlt-1 is depicted as shown in FIGS. 4 and 5. The arm 24 to which the float 25 is attached swings up and down with reference to the fulcrum 30 in the valve device 20, and the float 25
5 is designed to move up and down as the height of the curved surface changes (Jl).The valve body 3 is connected to the arm 24 via springs 31 and 32.
3.34 are connected, and the valve bodies 33.34 respectively face the valve ports 37.38. Where the valve bodies 33, 34 are located, there are respective valve chambers 35, 36, which are connected by passages 40 to the intermediate pressure port 22.
It communicates with Valve port 37 communicates with valve chamber 39 , valve chamber 39 communicates with low pressure port 21 , and valve boat 38 communicates with high pressure boat 23 .

As shown in FIG. 4, when the oil level in the first oil sump 15 drops and the flow) 25 falls to the lower level, that is, when the oil level is lower than the set value range, the first valve Valve port 37
opens, and the valve port 38 associated with the second valve closes. At this time, the valve chamber 39 connected to the low pressure port 21 and the valve chamber 35 connected to the intermediate pressure boat 22 communicate with each other, and the oil is transferred from the second oil reservoir 26 to the pipe 22a, the intermediate pressure boat 22, the passage 40,
Valve chamber 35, valve boat 37, valve chamber 39, low pressure port 21,
The oil flows through the pipe 21a to the suction expanded pipe 9, is sucked into the compressor together with the gas, and finally moves to the first oil reservoir +5, causing the oil level to rise.

When the curved surface is at an appropriate intermediate level, that is, within the set value range, the valve body 33 closes the valve boat 37, and the valve body 34 closes the valve boat 38, as shown in FIG. It doesn't happen.

When the oil level in the first oil sump 15 is too high and the float 25 rises to the upper level, that is, when the oil level is higher than the set value range, the valve port 38 opens and the valve boat 3
7 closes. At this time, the high pressure boat 23 and the valve chamber 36 communicate with each other, and the passage 40 communicates with the intermediate pressure port 22. Therefore, the oil in the first oil sump 15 is transferred from the high pressure boat 23 to the valve boat 38, the valve chamber 36, the passage 40, the intermediate pressure port 22,
It flows to the second oil sump 26 via the pipe 22&, lowering the oil level in the first oil sump 150.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a longitudinal sectional view of a hermetic scroll compressor according to another embodiment of the present invention, where the same reference numerals as in FIG. 2 indicate equivalent parts.

In this example, the bottom of the chamber 1' does not have double walls, and there is a first oil sump 15 for supplying oil at the bottom of the chamber 1'. The intermediate pressure region chamber 14' in the frame 5' of the compression element is greatly enlarged and provided with 14'a;
A second oil reservoir 41 is used. In this way, in the example shown in FIG. 2, the pipe 27 connecting the intermediate pressure region 14 and the second oil reservoir 26 is unnecessary, and the size of the compressor can be reduced.

In these embodiments, all or part of the oil piping is shown outside the chamber, but it is also possible to place it inside the chamber. Also, the valve device 20 in FIGS. 4 and 5
is a two-dimensional illustration, and the actual three-dimensional structure is arbitrary.

By installing the oil level control device as in these embodiments, even if oil temporarily leaks into a unit such as an air conditioner and the oil level in the compressor drops, the spilled oil will not reappear. Even if the oil level in the oil reservoir rises when the oil returns, it always works to keep the oil level at an appropriate level, so there will be no lubrication failure due to lack of oil or loss of agitation due to excessive oil amount.

Additionally, in both the example of FIG. 2 and the example of FIG. 6, the second oil reservoir is in contact with the high temperature section, so there is no problem such as condensation of the refrigerant here.

In addition, not only the example shown in Fig. 6 but also the example shown in Fig. 2 also shows that the piping 27
By increasing the thickness to a certain extent, the oil in the intermediate pressure region 14 falls into the second oil reservoir 26 by gravity, so oil does not accumulate in the intermediate pressure region 14 and agitation loss of the balance weight 7 occurs. In some type of air conditioners, the piping connecting the outdoor unit and the indoor unit is long, and even if there is a constant amount of oil in the unit, the amount of oil in the second oil sump is just that much smaller. By simply balancing the amount of oil in the first oil reservoir, the amount of oil in the first oil reservoir can be maintained at the specified value. Therefore, there is no need to take the trouble of adjusting the amount of oil to the bond depending on the length of the piping.

In addition, in each of the above-mentioned embodiments, an example of a hermetic scroll compressor for a sudden air conditioner has been described. However, the present invention is applicable only to the applicable unit and compressor type of the embodiments. It is a general-purpose type of hermetic compressor equipped with an oil level control device that can be expected to have similar effects.

〔Effect of the invention〕

As described above, according to the present invention, when the oil level in the compressor chamber is too low, the oil is replenished, and when it is too high, it is recovered, and the oil level is always maintained at an appropriate level, thereby providing lubrication due to lack of oil. Prevents agitation loss of rotating parts due to defects or excessive oil volume,
It is possible to provide a completely hermetic compressor that is reliable against oil spills.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional hermetic scroll compressor, FIG. 2 is a vertical cross-sectional view of a hermetic scroll compressor according to an embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view of a conventional hermetic scroll compressor. A cross-sectional view,
4 and 5 are longitudinal cross-sectional views of an oil level control device portion according to an embodiment of the present invention, and FIG. 6 is a longitudinal cross-sectional view of a hermetic scroll compressor according to another embodiment of the present invention. It is. 1. Chamber 2. Fixed scroll 3.
...Orbital scroll 5...Frame 8...1t
J+m 9...Suction piping 13...Discharge piping 15
...First oil sump 16...Inner wall 2o...Valve device 21...Low pressure boat 22...Intermediate pressure port 23...High pressure port 2+a, 22a...Piping 24...・Arm 25...Float 26...
Second oil reservoir 27... Piping 33.34... Valve body 37.38... Valve port 35.36.37...
Valve chamber 41...Second oil reservoir $2-@

Claims (1)

[Claims] 1. In a completely hermetic compressor that houses an electric element and a compression element in a chamber, and also includes a suction pipe and a discharge pipe, and further includes an oil reservoir in the chamber, a first oil sump, a second oil sump provided separately from the oil sump, a means for detecting the oil level height of the first oil sump, and an operation upon detecting the oil level height. a passage connecting the valve apparatus and the first oil reservoir, a passage connecting the valve apparatus and the second oil reservoir, and a passage connecting the valve apparatus and the suction piping. provided, when the oil level height of the first oil sump is lower than a set value range, the first valve of the valve device opens and the second valve of the second oil sump device opens; When the passage connecting the first oil sump and the second oil sump communicates with each other, and the oil level height of the first oil sump is within the set value range, either the first oil sump or the second oil sump A completely hermetic compressor characterized in that the valve is also closed. 2. In the device described in claim 1, the inside of the chamber is a discharge pressure region, the compression element is a scroll compressor, an intermediate pressure region is provided in the frame of the scroll compressor, and the intermediate pressure region and the A completely hermetic compressor that is equipped with a passage connecting the upper space area of the oil sump (2). 5. In either of claims 1 or 2, the means for detecting the oil level height is a float having a fulcrum on the valve device, and when the float goes down, the A completely hermetic compressor that is configured so that when the first valve opens and the float rises to the upper level, the second valve of the valve device opens, and when the float is in the middle position, both valves close. . 4. A completely hermetic compressor according to any one of claims 1 to 3, wherein the second oil reservoir is an open area formed by doubling the chamber wall. 5. In any one of claims 1 to 3, the second oil reservoir is a completely enclosed compression type in which the second oil reservoir is a closed space area that also serves as an intermediate pressure area within the frame of the compression element. Machine.