JPH0247669B2 - NETSUHONPUSOCHI - Google Patents

Description

Detailed Description of the Invention: Industrial Application Field The present invention uses a non-azeotropic mixed refrigerant to change the composition of the refrigerant flowing through the main circuit of the refrigeration cycle using a refrigerant rectification column, thereby constantly generating capacity corresponding to the load. The present invention relates to a possible heat pump device.

BACKGROUND ART Conventionally, there has been a configuration shown in FIG. 2 in which a non-azeotropic mixed refrigerant is used and the refrigerant composition flowing through the main circuit of a refrigeration cycle is changed by a refrigerant rectification column. In Fig. 2, 1 is a compressor, 2 is a condenser, 3, 4, and 5 are throttling devices, 6 is an evaporator, 7 is a refrigerant rectification column, a bottom reservoir 8, a heating source 9, and a top reservoir. 10, and is configured to have a cooling source 11.
Here, 12, 13, and 14 are solenoid valves.

The action of the heat pump device constructed as described above was as follows.

The refrigerant gas discharged by the compressor 1 flows in the direction of the solid arrow, is condensed in the condenser 2, and enters the expansion device 3. During normal operation, the solenoid valves 12, 13, and 14 are closed, and the refrigerant is sucked into the compressor 1 again through the throttle device 4 and the evaporator 6 as it is. When changing the refrigerant composition of the main circuit, the electromagnetic valve 12 is opened to allow a part of the refrigerant flowing through the main circuit to flow into the refrigerant rectification tower 7, and the heating source 9 and the cooling source 11 are activated. The refrigerant is separated into low-boiling point components and high-boiling point components by rectification and stored in the top reservoir 10 and the bottom reservoir 8, respectively, and the solenoid valves 13, 1
By the operation in step 4, the refrigerant having the desired composition is drawn into the squeezing device 5.
It flows out into the main circuit through. By doing so, the composition of the refrigerant flowing through the main circuit can be freely varied from a composition rich in low boiling point components to a composition rich in high boiling point components. In general, running a refrigerant rich in low-boiling components in the main circuit increases the capacity, and conversely, flowing a refrigerant rich in high-boiling components causes a decrease in capacity. Therefore, by simply opening and closing the solenoid valve, the capacity can always be generated in accordance with the load.

Problems to be Solved by the Invention Electric heaters and compressor discharge gas towers have been used as heating sources for refrigerant rectification columns in such conventional heat pump devices. ,
This results in increased power consumption (decreased coefficient of performance),
Additionally, there were problems such as burnout due to dry heating of the heater. In addition, when compressor discharge gas is used, the gas leaving the compressor passes through the heating source of the refrigerant rectification column before entering the condenser, which increases pressure loss and lowers the coefficient of performance. However, since heat is removed by the heating source, the temperature of the refrigerant gas entering the condenser drops, making it impossible to sufficiently raise the temperature of air, water, etc., which is the original purpose.

Therefore, an object of the present invention is to provide a heat pump device that can sufficiently raise the temperature of the load, such as air or water, without reducing the coefficient of performance, and can generate a capacity according to the load. shall be.

Means for Solving the Problems The technical means of the present invention for solving the above problems is to use lubricating oil in the compressor as a heating source for the refrigerant rectification column.

Effect According to the above configuration, the high-temperature lubricating oil inside the compressor is used as a heating source for the refrigerant rectification column, and the low-temperature lubricating oil returned to the compressor is used to lubricate the sliding parts inside the compressor. Alternatively, it can be used to seal clearances while maintaining the functionality of the refrigerant rectifier.
Compressor performance can be improved and the coefficient of performance can be further improved.

Embodiment FIG. 1 is a configuration diagram of a refrigerant circuit according to an embodiment of the heat pump device of the present invention. In the figure, a compressor 15, a condenser 16, throttle devices 17 and 18, and an evaporator 20 are connected to form a main circuit of a refrigeration cycle. Further, 21 is a refrigerant rectification column, 22 is a top reservoir, 23 is a cooling source, and 24 is a bottom reservoir. The heating source 25 is connected to the piping 26 and the compressor 1
5 to form one circulation path. Here, 27, 28, 29 are electromagnetic valves. As shown in FIG. 3, part A in the figure includes an oil pump 30 at the bottom of the compressor 15 and is connected to a pipe 26.

The operation of the heat pump device configured as described above will be explained. The high-temperature, high-pressure refrigerant gas discharged from the compressor 15 flows in the direction of the broken line arrow, is condensed and liquefied in the condenser 16 , and flows into the expansion device 17 .

During normal operation, the solenoid valves 27, 28, and 29 are closed, and at this time, all the refrigerant enters the throttling device 18, evaporates in the evaporator 20, and is sucked into the compressor 15 again.

When changing the refrigerant composition of the main circuit, the solenoid valve 27 is opened, a part of the refrigerant of the main circuit flows into the refrigerant rectification column 21, and the liquid refrigerant in the tower bottom reservoir 24 is heated by the heating source 25. generates gas. On the other hand, the refrigerant gas that has risen in the refrigerant rectification tower 21 is cooled by the cooling source 23 and liquefied, and while being stored in the tower top reservoir 22, it descends again in the refrigerant rectification tower 21 and rises with gas and liquid. By bringing about the contact, a rectification effect is performed to separate the low-point components and the high-boiling components, which are stored in the top reservoir 22 and the bottom reservoir 24, respectively. Further, by opening and closing the solenoid valves 28 and 29, the water flows out to the main circuit via the throttle device 19.
By doing so, the composition of the refrigerant flowing through the main circuit can be freely varied from a composition rich in low boiling point components to a composition rich in high powder point components.

On the other hand, the high-temperature lubricating oil in the compressor 15 flows in the direction of the solid line arrow through the pipe 26 connected to the bottom of the compressor 15, and is stored in the bottom reservoir 24 by the heating source 25 of the bottom reservoir 24. This heats the refrigerant in the tank and generates refrigerant gas. Furthermore, the lubricating oil that has passed through the heating source 25 is cooled by the refrigerant and returns to the bottom of the compressor 15 in the direction of the arrow. The compressor 1 performs the pump action of circulating this lubricating oil.
This is a 5-shaft oil pump 30, and usually has a structure with twisted blades etc. in the hollow part of the compressor shaft, which allows cooled lubricating oil to rise inside the oil pump 30. , the sliding parts of the compressor 15 or the clearance, etc., have a lubricating effect and a sealing effect.

In general, the factors that affect compressor performance are:
Loss due to heat reception of the refrigerant gas, pressure loss, friction loss, re-expansion loss, etc. are listed, but among these, loss due to heat reception of the refrigerant gas is extremely large.This is because the suction gas of the compressor enters the cylinder and is discharged This is because during the process of being compressed to gas pressure, heat is transferred from the cylinder wall or lubricating oil leaks from the clearance, resulting in a polytropic change while receiving heat rather than an adiabatic change.In order to reduce this loss, It is known that cooling the cylinder and lubricating oil is most effective. In this embodiment, the bottom reservoir 24 of the refrigerant rectification column 21 is heated with lubricating oil to be used as a heat source for rectification, and conversely, by cooling the lubricating oil, the compressor Heat loss can be significantly reduced, and the characteristics of the compressor will also be significantly improved.

Therefore, by combining the above-mentioned means of varying the refrigerant composition in the main circuit with the cooling effect of the lubricating oil, a heat pump device with an extremely high coefficient of performance and the ability to constantly respond to changes in load can be obtained. It will be done.

Further, by using a conventionally used in-compressor oil pump for circulating lubricating oil, the lubricating oil can be reliably circulated with a simple configuration.

Although the in-compressor oil pump of this embodiment has not been described in detail, other pumps that utilize the compressor shaft, oil pumps that use other pistons/cylinders, etc. may be used.

Further, although this embodiment has shown an example in which the refrigerant rectification column operates at an intermediate pressure between the condenser internal pressure and the evaporator internal pressure, it may operate at the condenser internal pressure or the like. Further, if an electromagnetic lunch box is provided in the middle of the piping 26 and the oil circulation is stopped at startup, etc., characteristics at startup can be improved.

Effects of the Invention As described above, the heat pump device of the present invention has the following features:
A part of the refrigerant flowing through the main circuit is introduced into the refrigerant rectification column, where it undergoes rectification to change the refrigerant composition in the main circuit from a composition rich in low boiling point components to a composition rich in high boiling point components. In addition to being able to always generate capacity according to the load, since the lubricating oil inside the compressor is used as a heating source, the characteristics of the compressor can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a refrigerant circuit of a heat pump device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a refrigerant circuit of a heat pump device using a conventional refrigerant rectification column, and FIG. FIG. 2 is an enlarged sectional view showing details of section A in FIG. 1; 15... Compressor, 21... Refrigerant rectification column, 25...
...Heating source, 30... Oil pump in the compressor, 24
... Tower bottom reservoir.

Claims (1)

[Claims] 1 A compressor, a condenser, a throttle device, and an evaporator are connected to form the main circuit of the refrigeration cycle, and a non-azeotropic mixed refrigerant is used as the refrigerant, and the main circuit and the refrigerant rectification tower are connected via an on-off valve. connecting an overhead reservoir having a cooler and connected to the top of the refrigerant rectification column to the main circuit via an on-off valve;
A bottom reservoir located at and connected to the bottom of the refrigerant rectification column is connected to the main circuit via an on-off valve, and includes a heater that heats the inside of the bottom reservoir; A heat pump device configured to use lubricating oil in the compressor as a source.