JPS63120878A - Compressor - Google Patents

Abstract

PURPOSE:To restrain the rise of the consentration of refrigerant for refrirgerator oil in a refrigerating cycle compressor receiving a compression section and a motor in an enclosing container by providing a refrigerant tray formed to surround a stator coil end between the motor and the compression section. CONSTITUTION:A rotary type compressor for refrigerating cycle receives a compression section C and a motor M for driving said section in an enclosing container 1 which encloses refrigerator oil for lubricating and sealing the compression section on the bottom. Then, a refrigerant tray 4 formed to surround a stator coil end E of the motor M is disposed between the motor M and the upper bearing 6 of compression section C and secured fixedly to said container 1. When the compressor R is in the cool state like that of starting warming and cooling, liquid refrigerant provided from a condensed portion of gas refrigerant and dropping from a discharge path 20 can be collected by the tray 4 to prevent from dropping into the refrigerator oil.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a compressor, and is particularly suitable for preventing abnormal rise of refrigerant wave antinode of refrigerating machine oil and forming during unsteady operation such as during cold startup. This relates to a compressor for a refrigeration cycle.

[Conventional technology]

A compressor for a refrigeration cycle houses a compression part capable of compressing a refrigerant and a motor that drives this compression part in a sealed chamber, that is, a closed container, and a motor that drives the compression part at the bottom of the compressor. Contains refrigeration oil used to seal the high-pressure side and low-pressure side of the engine and to lubricate sliding parts. Since this refrigerating machine oil flows out from the compressor into the refrigerating cycle and is returned to the compressor, an oil that easily dissolves in the refrigerant is generally used.

Therefore, when the compressor temperature is lower than the pressure, or in other words, the refrigerant saturation temperature, such as during cold startup,
A large amount of refrigerant melts into the refrigerating machine oil in the sealed container, lowering the viscosity of the refrigerating machine oil, and contributing to poor lubrication of bearings related to sliding parts. In addition, the abnormal increase in the refrigerant strength of the refrigerating machine oil caused a severe forming phenomenon caused by rapid pressure drop, heating, stirring, etc., and caused an abnormal drop in the oil level of the refrigerating machine oil in the sealed container.

Therefore, as a method to reduce the drop in oil level due to forming, as shown in Japanese Patent Application Laid-open No. 1450/1983, a means for detecting forming is provided in the chamber, and compression is performed at the point where 7 ohms occur. It is known that the machine can be rotated at low speed to suppress the 7 ohms of refrigerating machine oil. This method reduces the rotation speed of the compressor when the forming phenomenon occurs, so it is possible to slow down the flow rate of refrigerant gas and reduce the amount of refrigerating machine oil discharged from the compressor to the refrigeration cycle. can. However, this does not prevent the refrigerating machine oil from forming.

In addition, as a method of reducing the forming phenomenon itself, for example, as shown in Japanese Utility Model Application Publication No. 145290/1983, a partition member is placed in refrigerating machine oil to prevent the rotor of the motor from forming.
There is a known method to reduce the amount of stirring and heating caused by the discharged gas refrigerant, such as vanes in the compression section.However, this method does not reduce the refrigerant concentration in the refrigerating machine oil, so it can prevent sudden pressure It is not effective in preventing the 7-ohm phenomenon caused by descent.

7 ohms of refrigerating machine oil hardly occurs if the amount of refrigerant dissolved in the refrigerating machine oil is small. Therefore, as a method of restricting the infiltration of the refrigerant into the refrigerating machine oil, for example, as shown in Japanese Utility Model Application No. 60-55952,
A sensor is installed in the chamber to detect the inflow of refrigerant into the refrigerating machine oil, and when the amount of refrigerant inflow reaches a certain value, a bypass path connecting the high pressure side and the low pressure side of the refrigeration cycle is installed. It is known to reduce the pressure on the high pressure side and prevent refrigerant from entering the refrigerating machine oil. This method can suppress the refrigerant concentration in the refrigerating machine oil to below a certain value, but the means of suppressing the dissolution of the refrigerant into the refrigerating machine oil itself reduces the efficiency of the refrigerating cycle. Even if only the time is allowed to function, a decrease in overall efficiency is unavoidable.

[Problem that the invention seeks to solve]

None of the above-mentioned conventional technologies fundamentally eliminates the abnormal increase in the refrigerant concentration of refrigeration oil or the occurrence of forming, but merely controls the refrigerant concentration and forming so that they do not exceed the limit values. Furthermore, if the high-pressure side and low-pressure side of the refrigeration cycle are connected by a bypass path when the amount of refrigerant infiltration reaches its limit, the performance of the refrigeration cycle will deteriorate, and the sensor f will function only when necessary. However, there is still a problem in that overall efficiency is inevitably lowered.

The present invention improves the problems of the prior art as described above, suppresses the increase in the refrigerant concentration of refrigeration oil without deteriorating the performance of the refrigeration cycle, and provides a compressor that does not cause poor lubrication or forming. Its purpose is to provide the following.

[Means for solving problems]

A compressor according to the present invention for solving the above problems includes at least a compression part for compressing refrigerant in a closed container, and a compressor located above the compression part and used to drive the compression part. In a compressor that accommodates a motor with a stator coil end protruding downward, and in which refrigerating machine oil is sealed in the bottom of the motor, there is a compressor that surrounds the stator coil end between the motor and the compression part. The refrigerant receiver formed in the above is equipped with a plate.◇ [Function] The refrigerant receiver is provided with a plate surrounding the stator coil end of the motor, and the liquid refrigerant that condenses and drips at the top of the compressor during cold startup etc. The refrigerant receiver receives and collects the liquid refrigerant with a plate, and the liquid refrigerant is evaporated from the heat generated by the stator coil end portions, and then discharged from the compressor to the refrigeration cycle.

〔Example〕

Before entering into the description of the embodiments, basic matters related to the present invention will be explained.

In a rotary compressor for a refrigeration cycle, a compression section and a motor for driving the compression section are housed in a closed container, and refrigeration oil for lubricating and sealing the compression section is also sealed. Refrigerating machine oil is a liquid and stays at the bottom of a sealed container, so
An oil pump is installed at the bottom of the compression section to pump the oil upward. Therefore, the positional relationship within the compressor is normally such that the oil reservoir is located at the bottom, the compression section is located above that, and the motor is located above that. The refrigerant flow is such that the refrigerant is sucked into the compression section from the refrigeration cycle, is compressed and then discharged upward, cools the motor, and then is discharged from the upper part of the closed container to the refrigeration cycle.

When the entire compressor including the motor is completely cold, such as during heating/cooling startup, the high-temperature, high-pressure gas refrigerant discharged from the cylinder of the compression section will heat the motor, etc., and the gas refrigerant itself will heat up. is condensed by the motor and drips downward. At the time of heating/cooling startup, the temperature of the cold machine oil is low,
As the pressure is rising, the refrigerant that condenses in the compressor will dissolve into the refrigerating machine oil without restriction, and the refrigerant in the refrigerating machine oil! ! Increase the degree. Therefore, in the conventional compressor, the refrigerating machine oil with the highest concentration of refrigerant is pumped up by the oil pump at the time of cold startup and used for lubrication and sealing.

Therefore, the present invention provides a refrigerant receptacle that is located between the motor and the compression section in a closed container, surrounds the stator coil end of the motor, and that receives the liquid refrigerant dripping from above. An evaporating dish is provided to prevent the liquid refrigerant from mixing with the refrigerating machine oil at the bottom of the sealed container, and the liquid refrigerant accumulated in the evaporating dish is re-evaporated by the heat generated from the stator coil end, thereby reducing the refrigerant m of the refrigerating machine oil. This is to suppress the rise in temperature.

Thus, by carrying out the present invention, it is possible to lower the refrigerant concentration of the refrigerating machine oil, ensure the lubricating performance of the bearing, and suppress the occurrence of forming.

Hereinafter, the present invention will be explained with reference to examples and drawings.

FIG. 4 is a longitudinal sectional view of a compressor according to an embodiment of the present invention;
FIG. 2 is a perspective view showing details of the refrigerant tray in FIG. 4.

The outline of this compressor R is that between the motor M and the compression section C,
The refrigerant receiver formed in this manner is provided with a plate 4 so as to surround the stator coil end portion E of the motor M.

The configuration of this compressor R will be explained in detail below.

5 is a cylinder; 6 is an upper bearing that is fixed to the cylinder 5 with a bolt (not shown) and forms the upper end surface of the cylinder 5 and holds the crankshaft 10; 7 is a bolt (not shown) that is also attached to the cylinder 5; (not shown), which constitutes the lower end surface of the cylinder 5 and holds the crankshaft 10.

8 is the cylinder 5. A piston 10 that moves eccentrically within a compression chamber 9 formed by an upper bearing 6 and a lower bearing 7 to compress a refrigerant is a crankshaft that causes the piston 8 to move eccentrically. 11 is a rotor of a motor M attached to the crankshaft 10, and 12 is a stator of the motor M. Reference numeral 4 is located between the motor M and the upper bearing 6 of the compression section C, and is formed to surround the stator coil end section E of the motor M, and the refrigerant receiver attached to the compressor case 1 is a plate. The refrigerant receiver has a small hole A formed in the plate 4, as shown in detail in FIG. This small hole A is provided to prevent refrigerating machine oil 3 from accumulating in the refrigerant tray 4 during steady operation of the compressor R.

These parts are assembled inside a compressor case 1, and this compressor case 1 is sealed with an upper lid 24 to form a closed container. Refrigerating machine oil 3 is sealed in this airtight container.

13 is an oil supply piece attached to the lower end ζζ of the crankshaft 10, and the refrigerating machine oil 3 is pumped up through the hollow part (not shown) in the crankshaft 10 by this oil supply piece 13, and is pumped up to the sliding part of the compression part C. is refueled.

14 is a suction pipe attached to the compressor case 1 and the cylinder 56, 15 is a suction passage provided in the cylinder 5 for guiding the refrigerant from the suction pipe 14 to the compression chamber 9, and 16 is a lower A discharge valve provided on the bearing 7, 1
7 holds the discharge valve 16.

18 is a discharge cap that forms a discharge chamber 198 with the lower bearing 7; 20 is a discharge passage drilled to communicate with the lower bearing 7, the cylinder 5° and the upper bearing 6; 21 is a refrigerant provided in the stator 12; The gas flow path 22 is a discharge pipe provided in the upper lid 2.

The operation of the compressor R configured in this way will be explained.

When the motor M of the compressor R is energized (the power required for energization,
(Switches, wiring, etc. are not shown) The rotor 11 rotates, refrigerant is sucked from the suction pipe 14, and the refrigerant is drawn into the suction passage 15.
is sent to the compression chamber 9 through the The gas refrigerant compressed by the piston 8 in the compression chamber 9 is discharged from a discharge valve 16 provided on the lower bearing 7 to a discharge chamber 19 . Next, the gas refrigerant discharged above the upper bearing 6 through the discharge passage 20 passes through the refrigerant receiver between the plate 4 and the rotor 11, as shown by the arrow, and the countersunk part is connected to the rotor 11. The remaining refrigerant gas passes between the lines of the stator coil end E, passes through the refrigerant gas passage 21 of the stator 12, merges at the upper part of the motor M, and then flows from the discharge pipe 22 to the refrigerant gas outside the compressor R. It is discharged into a cycle (not shown) and circulated.

By the way, when the compressor R is completely cold, such as during a heating/cold start, part of the gas refrigerant discharged from the discharge passage 20 condenses before reaching the discharge pipe 22.
(This condensation is mainly performed in the stator 12, which has a large heat capacity.) The refrigerant becomes a liquid refrigerant and drips. Since the dripped refrigerant is collected in the refrigerant tray 4, only a small amount of the dripped refrigerant drips directly into the refrigerating machine oil 5. The liquid refrigerant collected in the refrigerant tray 4 is heated and evaporated by the heat generated from the stator coil end E, and then is sent from the discharge pipe 22 to the compressor R.
Exhaled outside. Therefore, the refrigerating machine oil 3 is less likely to be diluted by the liquid refrigerant, and the refrigerant concentration of the refrigerating machine oil 3 can be kept low.

This will be explained using the drawings.

FIG. 3 shows the temperature of the compressor shown in FIG. 4 at cold startup,
FIG. 2 is a refrigerant degree change diagram showing the refrigerant concentration in refrigerating machine oil in comparison with that of a conventional compressor. In the figure, the solid line shows the compressor R according to FIG. 4, and the broken line shows the conventional compressor. Moreover, the time is the time measured from the start of the compressor.

To explain using FIG. 3, first, the change in the refrigerant concentration of the refrigerating machine oil during cold startup of the conventional compressor shown by the broken line is as follows.
It will look like this: That is, at the same time as startup, the liquid refrigerant is mixed into the refrigerating machine oil due to liquid return during startup and refrigerant condensation in the compressor.

At this time, since the refrigerating machine oil temperature is low, all of the mixed refrigerant dissolves into the refrigerating machine oil, and the refrigerant concentration of the refrigerating machine oil rapidly increases. Then, as the refrigerating machine oil temperature gradually rises, the refrigerant cannot be completely dissolved, and the refrigerant concentration of the refrigerating machine oil decreases to a constant value. On the other hand, in the compressor R implementing the present invention, the discharge passage 2
The refrigerant discharged from 0 and condensed at the top of the compressor R is collected in the refrigerant tray 4 and evaporated there, so the liquid returns at startup, and the liquid refrigerant generated by refrigerant condensation in the compressor is frozen. The solution evaporates without entering the machine oil, and as shown by the solid line in Figure '$5, it can be seen that the refrigerant concentration in the refrigerating machine oil can be kept lower than in conventional compressors. For example, during unsteady operation such as during cold start-up (even in this case, the refrigerant concentration in the refrigerating machine oil can be kept low at all times, so the viscosity drop in the refrigerating machine oil, which was a problem in the past, is eliminated, and sliding parts Such poor lubrication of the bearing can be improved.Furthermore, lowering the refrigerant concentration of the refrigerating machine oil eliminates the cause of forming, and can also improve the drop in oil level caused by 7 ohms.

Furthermore, since the pressure on the high-pressure side is lowered by a bypass path connecting the high-pressure side and the low-pressure side of the refrigeration cycle and the dissolution of refrigerant into the refrigeration machine oil is not suppressed, this compressor Rζ There is no deterioration in the performance of the connected refrigeration cycle.

Other embodiments will be described below.

FIG. 4 is a longitudinal sectional view of a compressor according to another embodiment of the present invention. In this FIG. 4, parts given the same numbers as in FIG. 4 are the same parts.

The rotary compressor R' of this embodiment is almost the same as the compressor R shown in FIG. 4, but only the different parts will be explained below.

In the non-embodiment, a communication pipe 26 is provided that connects the discharge passage 20 of the compression section C and the refrigerant receiver tray 4A, so that all the high temperature and high pressure refrigerant compressed in the compression section C is directly transferred to the refrigerant receiver tray 4A. It is designed to discharge to 4A.

By the way, a large amount of liquid refrigerant returns to the compressor R' from the refrigeration cycle at times such as when the compressor R' is started or when the heating operation is restarted after the defrosting operation. At this time, the liquid refrigerant is in the compression chamber 9
The discharge passage 20 is kept in a liquid state without evaporating inside.
However, since the communication pipe 23 is provided, all of the refrigerant is directly guided to the tray 4A and does not fall to the bottom of the compressor case 1. Therefore, the rise in the refrigerant concentration in the refrigerating machine oil 5 is further reduced.0 Also, the liquid refrigerant accumulated in the refrigerant tray 4AG is directly heated by the discharged gas, and is also sprayed onto the stator coil end portion E, so that it evaporates. has the advantage of being even faster. In this way, the refrigerant condensed in the compressor can be separated from the refrigerating machine oil and reevaporated, which has the effect of further lowering the refrigerant content of the refrigerating machine oil.

〔Effect of the invention〕

As explained in detail above, according to the present invention, by suppressing the increase in the refrigerant temperature of the refrigerating machine oil without deteriorating the performance of the refrigerating cycle, the compressor is free from poor lubrication and forming. can be provided.

[Brief explanation of the drawing]

FIG. 4 is a longitudinal sectional view of a compressor according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing details of the refrigerant tray in FIG. 4, and FIG. A refrigerant concentration change diagram showing the refrigerant concentration in the refrigerating machine oil at the time of cold start of the compressor in comparison with that of a conventional compressor, Fig. ii1!4 shows the compressor according to another embodiment of the present invention. FIG. 1...Compressor case 2...Top lid 3...Refrigerating machine oil 4,4A...Refrigerant receiver is plate 23...Communication vibe C...Compression section E...Stator end section M...・Motor R, R'... Compressor agent Patent attorney Katsutoshi Ogawa QJ (Ki 32 Figure σ To 3 Figure Time →

Claims (1)

[Claims] 1. In a closed container, at least a compression section that compresses a refrigerant, and a stator coil end that is located above the compression section and used to drive the compression section protrudes downward. In a compressor that houses a stator motor and has refrigerating machine oil sealed in its bottom, a refrigerant tray is provided between the motor and the compression section so as to surround the stator coil end. Compressor features. 2. The compressor according to claim 4, further comprising a communication pipe connecting the discharge passage of the compression section and the refrigerant receiving tray.