JPS63100285A - Compressor - Google Patents

Abstract

PURPOSE:To prevent insufficient lubrication or production of foaming, by storing refrigerator oil in the bottom of an enclosed container and carrying out heatexchange between delivery gas led into a delivery chamber and the refrigerator oil thereby lowering the refrigerant concentration in the refrigerator oil. CONSTITUTION:A compressor section C and a motor M are contained in an enclosed container comprising a compressor case 1 and an upper cover 2, and refrigerator oil 3 is stored in the bottom of the enclosed container. A delivery cap 4 for forming a delivery chamber 18 together with a lower bearing 7 is provided at the cempressor section C, and fins 4a, 4b crossing each other and extending into the refrigerator oil 3 are formed in said delivery cap 4. Consequently, heat exchange is promoted between delivery gas in the delivery chamber 18 and the refrigerator oil 3 through the fins 4a, 4b to heat the refrigerator oil 3 so as to lower the refrigerant concentration in the refrigerator oil 3 thus preventing insufficient lubrication or production of foaming.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a compressor, and in particular, to a compressor suitable for preventing an abnormal increase in the refrigerant concentration of refrigerating machine oil and forming during unsteady operation such as during cold startup. , 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. The refrigerating machine oil used for sealing between the high pressure side and the low pressure side and for lubrication of the sliding parts is sealed. 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 dissolves in 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, refrigerant for refrigeration oil, '1
The abnormal increase in temperature intensified the forming phenomenon caused by depressurization, heating, and stirring, 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 oil level drop due to forming, for example, as shown in JP-A-55-1450, a means for detecting forming is provided in the chamber, and when forming occurs, the compressor rotational speed is As a low speed type, one that suppresses the foaming of refrigerating machine oil is known. Since this method reduces the compressor rotational speed when a forming phenomenon occurs, it is possible to slow down the flow of refrigerant gas and reduce the amount of refrigerating machine oil discharged from the compressor to the refrigeration cycle. However, this does not prevent the refrigerating machine oil from forming.

Foaming of refrigerating machine oil hardly occurs if the amount of refrigerant dissolved in the refrigerating machine oil is small. Therefore, as a method for restricting the refrigerant from entering the refrigerating machine oil, for example, as shown in Japanese Utility Model Application Publication No. 60-55952, it is possible to detect where the refrigerant is entering the refrigerating machine oil in the chamber. A sensor is installed, and when the refrigerant infiltration reaches a certain value, a bypass path connecting the high-pressure side and the low-pressure side of the refrigeration cycle lowers the pressure on the high-pressure side, and the refrigerant intrusion into the refrigeration oil is stopped. It is known that it can be pressed. This method can suppress the refrigerant concentration in the refrigeration oil to below a certain value, but the means to prevent the refrigerant from dissolving in the refrigeration oil itself reduces the efficiency of the refrigeration cycle, and the sensor is used to control the refrigerant concentration only when necessary. Even if it were to work, a decrease in overall efficiency would be inevitable.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology constantly monitors the refrigerant concentration of refrigerating machine oil and controls the amount of refrigerant solubilization so that it does not exceed a limit value. However, although this control means can suppress the refrigerant concentration below a certain value, it also reduces the performance of the refrigeration cycle, and even if the sensor is used to make it function only when necessary, it still reduces the overall efficiency. The problem was that it could not be done.

The present invention improves the above-mentioned problems of the conventional technology, prevents abnormal rise in the refrigerant concentration of refrigeration oil without deteriorating the performance of the refrigeration cycle, and thereby prevents lubrication failure and forming. Its purpose is to provide a compressor.

[Means for solving problems]

The configuration of the compressor according to the present invention for solving the above problems includes at least a compression part capable of compressing refrigerant and having a discharge chamber at the lower part in a closed container, and a compressor for driving this compression part. In a compressor in which a motor is housed and refrigeration oil is sealed in the bottom of the compressor, heat is exchanged between the refrigeration oil in the bottom of the airtight container and the discharged gas refrigerant led to a discharge chamber. It is equipped with a heat exchanger for oil heating.

[Effect]

The discharged gas refrigerant is led to an oil heating heat exchanger provided in the refrigerating machine oil sealed in the bottom of the airtight container, and the refrigerating machine oil is heated by the heat of the discharged gas refrigerant, thereby reducing the concentration of the refrigerant.

〔Example〕

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

In a 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 the closed container, so an oil pump is installed at the bottom of the compression section to pump it upward. Therefore, the lower part of the compressor is an oil reservoir, and the compression section and the motor are located above it.

On the other hand, the heat source of a compressor is the discharged gas refrigerant compressed in the compression section and the motor, but in conventional technology, when the discharged gas refrigerant is put into the refrigerating machine oil, the refrigerant dissolves into the refrigerating machine oil. Furthermore, since putting the motor in refrigerating machine oil increases power loss, the discharge gas refrigerant, the motor, and the refrigerant machine oil have been separated as much as possible. Therefore, the refrigerating machine oil is in a state where it is difficult to heat up, and in particular, when the compressor is cold-started, the refrigerating machine oil temperature in the part pumped up by the oil pump at the bottom of the closed container is in the lowest state in the compressor.

As is well known, if refrigerating machine oil has the same pressure, the lower the temperature, the more refrigerant it will dissolve.In conventional compressors, the refrigerating machine oil with the highest concentration of refrigerant is pumped into the oil pump at the time of cold startup. This means that it was pumped up and used for lubrication and sealing.

Therefore, the present invention provides a heat exchanger for heating oil, such as a heat transfer tube, in the refrigerating machine oil that remains at the bottom of the closed container, and introduces the discharged gas refrigerant, which has been compressed at a compression section and becomes high temperature, into the refrigerating machine oil, and refrigerates the refrigerant. By exchanging heat with the machine oil, the temperature of the refrigerating machine oil at the bottom of the sealed container is increased.

The reason for using the discharge gas refrigerant as a heating source is that when the refrigerant concentration in the refrigerating machine oil increases, such as during cold startup, the temperature of the discharge gas refrigerant is the highest in the compressor, and for the following reasons. This is because the forming phenomenon can be reduced. In other words, the most severe form of refrigeration oil forming occurs when the refrigerant concentration in the refrigeration oil increases toward the bottom of the sealed container, and when it is balanced due to specific gravity, small forming occurs at the top of the refrigeration oil. ,
The resulting stirring force instantly mixes the refrigerating machine oil, and the refrigerating machine oil with a high refrigerant concentration comes into contact with the high temperature discharged gas refrigerant. Therefore, heating the refrigerating machine oil at the bottom of the sealed container with the discharged gas refrigerant not only lowers the refrigerant concentration in the refrigerating machine oil, but also lowers the temperature of the discharged gas refrigerant itself, which can suppress the occurrence of forming. It is.

In this way, by heating the refrigerating machine oil at the bottom of the sealed container with the discharged gas refrigerant, the refrigerant concentration of the refrigerating machine oil can be lowered, thereby ensuring the lubricating performance of the bearing and suppressing the occurrence of forming. It can be done.

Examples will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a compressor according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing details of the oil heating heat exchanger in FIG. 1.

The outline of this compressor R is that it can compress refrigerant in a closed container consisting of a compressor case 1 and an upper lid 2, and includes a compression part C that has a discharge chamber 18 at the bottom and drives this compression part C. The refrigerating machine oil 3 is sealed in the bottom of the sealed container, and the refrigerating machine oil 3 in the bottom and the discharge gas guided to the discharge chamber 18 are stored in the bottom of the sealed container. An oil heating heat exchanger 4 that can exchange heat with the refrigerant is provided.

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 (details will be described later); 7 is an upper bearing that is also attached to the cylinder 5; A lower bearing 8 fixed with a bolt (not shown) constitutes the lower end surface of the cylinder 5 and holds the crankshaft 10;
．． a piston that moves eccentrically within a compression chamber 9 formed by an upper bearing 6 and a lower bearing 7 to compress refrigerant;
10 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.

These parts are built into the compressor case 1,
The compressor case 1 is sealed by the upper lid 2, forming a closed container as described above. Refrigerating machine oil 3 is sealed in this airtight container.

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

14 is a suction pipe attached to the compressor case 1 and the cylinder 5; 15 is a suction passage provided in the cylinder 5 for guiding the refrigerant from the suction pipe 14 to the compression chamber 9; A discharge valve provided on the lower bearing 7, 1
Reference numeral 7 represents the valve of the discharge valve 16, and reference numeral 4 represents an oil heating heat exchanger in which mutually intersecting fins 4a and 4b are attached to a discharge cap that forms a discharge chamber 18 with the lower bearing 7. The oil heating heat exchanger 4 transfers the heat of the discharged gas refrigerant discharged from the discharge valve 16 to the discharge chamber 18 to the refrigerating machine oil 3 to perform heat exchange with the refrigerating machine oil 3. 19, lower bearing 7, cylinder 5. A discharge passage 20 bored in communication with the upper bearing 6 is a discharge pipe provided in the upper lid 2 of the closed container for discharging the discharged gas refrigerant from the compressor R to a refrigeration cycle (not shown). .

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 suction passage 1
5 and is sent to the compression chamber 9. 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 18 . The heat of this discharged gas refrigerant is radiated from the oil heating heat exchanger 4 to the refrigerating machine oil 3, and heat exchange is performed between the discharged gas refrigerant and the refrigerating machine oil 3, raising the temperature of the refrigerating machine oil 3, and increasing the temperature of the discharged gas refrigerant. The refrigerant, whose temperature has been lowered by heating the refrigerating machine oil 3 (details will be described later), is discharged through the discharge passage 19 above the upper bearing 6. The discharged refrigerant cools the rotor 11 and stator 12 of the motor M, and then is discharged from the discharge pipe 20 to a refrigeration cycle (not shown) outside the compressor R and circulates.

The aforementioned temperature rise of the refrigerating machine oil 3 due to heat radiation from the oil heating heat exchanger 4 and the accompanying change in the refrigerant sensitivity of the refrigerating machine oil will be explained in detail using the drawings.

3 and 4 are a refrigerating machine oil temperature change diagram and a refrigerant concentration change diagram respectively showing the refrigerating machine oil temperature and the refrigerant concentration of the refrigerating machine oil at the time of cold start of the compressor according to FIG. 1. In each figure, the solid line shows the compressor according to FIG. 1 in which the present invention is implemented, and the broken line shows the conventional compressor. It's time.

As is clear from FIG. 3, by implementing the present invention, it is possible to raise the refrigerating machine oil temperature more quickly than in the past.

On the other hand, as is well known, if the refrigerating machine oil 3 is under the same pressure, the lower the temperature, the more refrigerant will be dissolved in the refrigerating machine oil 3. This will reduce the refrigerant concentration.

To explain this using FIG. 4, first, the change in the refrigerant concentration of the refrigerating machine oil at the time of cold start 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 as shown by the broken line in FIG. 3, 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 according to the present invention, as shown by the solid line in Figure 3, the temperature of the refrigerating machine oil rises quickly, so the liquid refrigerant returns at startup, and the liquid refrigerant generated by refrigerant condensation in the compressor It evaporates without being dissolved in the refrigerating machine oil, and as shown by the solid line in Fig. 4, it can be seen that the refrigerant concentration in the refrigerating machine oil can be kept lower than in the conventional compressor.

According to the embodiment described above, the refrigerant concentration in the refrigerating machine oil can be kept low even during unsteady operation such as during cold start-up, so the decrease in the viscosity of the refrigerating machine oil, which has been a problem in the past, is eliminated, and sliding Poor lubrication of bearings related to moving parts can be improved.

Further, the reduction in the refrigerant concentration of the refrigerating machine oil and the reduction in the temperature of the discharged gas refrigerant discharged into the sealed container eliminates the cause of forming, and can also improve the drop in oil level caused by forming.

Furthermore, unlike conventional systems, 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 oil is not suppressed. There is no deterioration in the performance of the connected refrigeration cycle. Further, the oil heating heat exchanger 4 has the advantage that its structure is simple and inexpensive.

Other embodiments will be described below.

Although the embodiment shown in FIG. 1 uses the oil heating heat exchanger 4 to transfer the heat of the discharged gas refrigerant to the refrigerating machine oil 3, any form may be used as long as it has a heat transfer function.

FIG. 5 is a longitudinal sectional view of a compressor according to a second embodiment of the present invention, and FIG. 6 is a bottom view showing the oil heating heat exchanger in FIG. 5 and the discharge cap to which it is attached. It is. In FIG. 5, the same parts as in FIG. 1 are denoted by the same numbers.

The rotary compressor R' of this embodiment is almost the same as the compressor R shown in FIG. A heat transfer tube is formed in a meandering manner at the bottom of the compressor case 1. One end of the heat transfer tube is connected to a discharge cap 21 forming a discharge chamber 18, and the other end extends through the discharge cap 21 to form a discharge passage. It is connected to 19. The reason why the heat exchanger tubes are configured to meander in the lower part of the compressor case 1 is as follows.
This will be explained in detail below using the drawings.

7 and 8 are a refrigerating machine oil temperature distribution diagram and a refrigerant concentration distribution diagram respectively showing the refrigerating machine oil temperature in the height direction and the refrigerant concentration of the refrigerating machine oil before the cold start of the compressor is stabilized according to FIG. 5. . In each case, the solid line shows the compressor according to FIG. 5, and the broken line shows the conventional compressor. Also,
The vertical axis is a scale indicating the height from the bottom of the compressor case 1.

The heating source inside the compressor R' is the motor M and the discharged gas refrigerant, but if the motor M is placed in the refrigerating machine oil 3, the power loss will be large, and if the discharged gas refrigerant is put in the refrigerating machine oil 3, the refrigerant will be motor M because it melts into the refrigerating machine oil and lowers the viscosity of the refrigerating machine oil.

The discharge gas refrigerant is separated from the refrigerating machine oil 3.

Therefore, the refrigerating machine oil temperature becomes lower toward the bottom of the compressor case 1. The broken line in FIG. 7 shows the refrigerating machine oil temperature distribution of the conventional compressor, and the temperature difference between the upper and lower parts is particularly large. As mentioned above, if the refrigerating machine oil 3 is under the same pressure, the lower the temperature, the more refrigerant is dissolved in the refrigerating machine oil 3, so the refrigerant concentration of the refrigerating machine oil 3 increases as it goes to the lower part of the compressor case 1. This state is shown by the broken line in FIG. 8 (refrigerant concentration distribution of refrigerating machine oil in a conventional compressor).

In this way, in a state where there is a large difference in the refrigerant concentration between the upper and lower parts, even if a small amount of foaming occurs at the upper part of the refrigerant oil 3, the stirring force generated at that time will cause the refrigerant oil 3 to mix up and down, and the refrigerant oil with a high refrigerant concentration will transfer to the high-temperature discharge gas. It will come into contact with the refrigerant, and the foaming will become even more intense. Finally, the entire refrigerating machine oil 3 enters a forming state, and most of the refrigerating machine oil 3 is taken out of the compressor due to volumetric expansion.

On the other hand, in the compressor R' according to FIG. The temperature distribution is improved as shown by the solid line in FIG. 7, and the refrigerant concentration distribution of the refrigerating machine oil is improved as shown by the solid line in FIG. 8. Therefore, even if a small amount of forming occurs in the upper part of the refrigerating machine oil 3, the forming does not extend to the entire refrigerating machine oil.

In the compressor R′ configured in this way, the high temperature gas refrigerant compressed in the compression chamber 9 is transferred from the discharge valve 16 to the discharge chamber 18.
and is guided to an oil heating heat exchanger 4A that opens in the discharge cap 21. The discharged gas refrigerant heats the refrigerating machine oil 3 while passing through the oil heating heat exchanger 4A, is cooled, and is then discharged above the upper bearing 6 through the discharge passage 19.

According to the embodiment shown in FIG. 5 described above, similar to the compressor R shown in FIG.
By preventing an abnormal increase in the refrigerant concentration in the compressor, poor lubrication and forming of the bearing can be improved, and the performance of the refrigeration cycle connected to this compressor R' is not reduced. . Furthermore, since the heat exchanger tube 4A for heating oil is a heat exchanger tube that meanders under the compressor case 1, there is an advantage that the heat exchange performance thereof is further improved.

FIG. 9 is a longitudinal sectional view of a compressor according to a third embodiment of the present invention. In FIG. 9, the same numbers as in FIG. 5 indicate the same parts.

For example, a compressor with rotation speed control has a high rotation speed, so
The amount of gas refrigerant discharged is large considering the size of the cylinder. Therefore, a discharge valve may be provided not only in the lower bearing but also in the upper bearing.

FIG. 9 shows an embodiment in which the present invention is applied to such a compressor.

This compressor R' is almost the same as the compressor R' shown in FIG. 5, but only the different parts will be explained below.

In this FIG. 9, 23 is an upper discharge valve provided on the upper bearing 6A, 24 is an upper discharge valve that prevents the upper discharge valve 23 from rising, and 25 is an upper discharge cap that forms an upper discharge chamber 26 with the upper bearing 6A. It is. The oil heating heat exchanger 4B, which opens in the discharge cap 21A, snakes around the lower part of the compressor case 1, which serves as an oil reservoir, and then does not connect to the discharge passage 19, but connects to the opening of the cylinder 5 (not shown). ) and opens above the oil surface of the refrigerating machine oil 3.

In the compressor R' configured in this manner, the gas refrigerant compressed in the compression chamber 9 is discharged from the upper and lower discharge valves 23.16 to the upper and lower discharge chambers 26.18. The gas refrigerant discharged to the upper discharge chamber 26 passes through the discharge passage 19, enters the discharge chamber 18, and is led to the oil heating heat exchanger 4B together with the discharged gas refrigerant discharged from the discharge valve 16. The discharged gas refrigerant heats the refrigerating machine oil 3 while passing through this oil heating heat exchanger 4B,
After being cooled, it is discharged above the oil level of the refrigerating machine oil 3.

According to the embodiment related to FIG. 9 described above, the fifth
The present invention has the advantage that it has the same effect as the compressor R' shown in the figure, and can also be applied to a compressor that is provided with discharge valves 23, 16 above and below the cylinder 5 and discharges a large amount of gas refrigerant.

FIG. 10 is a longitudinal sectional view of a compressor according to a fourth embodiment of the present invention. In FIG. 10, the same numbers as in FIG. 5 indicate the same parts.

Some rotary compressors are equipped with a baffle plate between the motor and the compression section in order to prevent refrigerating machine oil from forming and the resulting abnormal oil level drop. This baffle plate separates the refrigerating machine oil from the discharged gas refrigerant, which serves as a heating source, and the rotor of the motor, which performs a stirring action, thereby suppressing the forming phenomenon. However, when starting up the compressor from a low temperature, such as during cold start-up, the structure separates the discharged gas refrigerant from the refrigeration oil, so the refrigeration oil temperature is lower than that of a compressor without baffles, and the refrigerant concentration in the refrigeration oil becomes lower. The disadvantage was that it was extremely expensive.

FIG. 10 shows an embodiment in which the present invention is applied to this type of compressor with a baffle plate.

This compressor R'''' is almost the same as the compressor R' shown in FIG. 5, but only the different parts will be explained below.

In FIG. 10, 27 is a baffle plate that partitions the compressor R'' into the motor M side and the compression section C side. The baffle plate 27 is fixed to the cylinder 5 together with the upper bearing 6 with bolts 28.

The discharge cap 21A and the oil heating heat exchanger 4B are the same as those shown in FIG. After meandering around the lower part of the cylinder 5, it passes through the opening of the cylinder 5 and opens above the baffle plate 27.

In the compressor RI I + configured in this way, the gas refrigerant compressed in the compression chamber 9 is discharged from the discharge valve 16 to the discharge chamber 18 and guided to the oil heating heat exchanger 4B. The discharged gas refrigerant heats the refrigerating machine oil 3 while passing through the oil heating heat exchanger 4B, is cooled, and is then discharged above the baffle plate 27.

According to the embodiment shown in FIG. 10 described above, even in a compressor with a baffle plate, the temperature of the refrigerating machine oil does not become low, and the refrigerant concentration of the refrigerating machine oil can be kept low. It has the advantage of being able to perform well even under such conditions.

Note that the oil heating heat exchangers 4A and 4B in the embodiments shown in FIGS. 5, 9, and 10 all have smooth heat transfer tubes with fins attached to the outer periphery or spiral grooves on the inner surface. This has the advantage that the length can be shortened because the heat transfer coefficient improves.

[Effects of the Invention] As described in detail above, according to the present invention, by preventing an abnormal increase in the refrigerant concentration of refrigerating machine oil without reducing the performance of the refrigerating cycle, poor lubrication and forming can be prevented. Can provide compressor without.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a compressor according to a first embodiment of the present invention, FIG. 2 is a perspective view showing details of the oil heating heat exchanger in FIG. 1, and FIGS. The diagrams are a refrigerating machine oil temperature change diagram, a refrigerant concentration change diagram showing the refrigerating machine oil temperature and the refrigerant concentration of the refrigerating machine oil at the time of cold start of the compressor according to FIG. 1, respectively.
FIG. 5 is a longitudinal sectional view of a compressor according to a second embodiment of the present invention, and FIG. 6 is a bottom view showing the oil heating heat exchanger in FIG. 5 and the discharge cap to which it is attached. , Figure 7,
FIG. 8 shows the refrigerating machine oil temperature in the height direction before stabilizing the cold start of the compressor shown in FIG. 5, respectively. Refrigerating machine oil temperature distribution diagram showing the refrigerant concentration of the refrigerating machine oil. The refrigerant concentration distribution diagrams, FIGS. 9 and 10, are respectively shown in Section 3 of the present invention. FIG. 7 is a longitudinal cross-sectional view of a compressor according to a fourth embodiment. DESCRIPTION OF SYMBOLS 1... Compressor case, 2... Top lid, 3... Refrigerating machine oil, 4.4A, 4B... Oil heating heat exchanger, 4a, 4
b...Fin, 18...Discharge chamber, 21.21A...
・Discharge cap, 26...1 discharge chamber, C...compression section, M...motor, Rt R', R', R11
+...Compressor.

Claims (1)

[Claims] 1. In a closed container, at least a compression section capable of compressing refrigerant and having a discharge chamber at the bottom, and a motor for driving this compression section are housed, and a motor for driving the compression section is housed at the bottom. In a compressor in which refrigeration oil is sealed, an oil heating heat exchanger is provided at the bottom of the airtight container to exchange heat between the refrigeration oil at the bottom and the discharged gas refrigerant led to the discharge chamber. A compressor characterized by: 2. The compressor according to claim 1, wherein the oil heating heat exchanger is a discharge cap that forms a discharge chamber and has fins attached thereto. 3. The compressor according to claim 1, wherein the oil heating exchanger is a heat transfer tube connected to a discharge cap forming a discharge chamber.