JPS6238624B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigeration system for increasing the cooling effect of a motor for driving a refrigerant compressor and reducing the size and weight of the system.

[Conventional technology]

A conventional refrigeration system of this type is shown in FIG. In the figure, 1 is a compressor that compresses refrigerant gas, 2 is a discharge pipe that discharges the refrigerant gas compressed by the compressor 1, 3 is a condenser that cools and liquefies the refrigerant gas compressed by the compressor 1, 4 is a cooling pipe built into this condenser 3; 5 is a cooling water inlet/outlet pipe for circulating cooling water to this cooling pipe 4; 6 is an expansion valve;
7 is an evaporator; 8 is a suction pipe that sucks the refrigerant gas evaporated in the evaporator 7 into the motor; 9 is a motor for driving the compressor that is directly connected to the compressor 1; 10 is a refrigerant for the compressor 1; It is a gas inlet. Note that the flow of refrigerant gas is indicated by arrows in the figure.

Next, the operation will be explained. The refrigerant gas compressed by the compressor 1 passes through the discharge pipe 2 and enters the condenser 3.
sent to. A cooling pipe 4 is built into the condenser 3 for cooling and liquefying the high-temperature, high-pressure refrigerant gas compressed by the compressor 1 and discharged from the discharge pipe 2. Since the cooling water is circulated to the cooling pipe 4 through the cooling water inlet/outlet pipe 5, the refrigerant gas sent to the condenser 3 is transferred to the cooling pipe 4 built into the condenser 3. It is cooled by heat exchange with and liquefied. This liquefied refrigerant gas is transferred to the expansion valve 6
The pressure is reduced by the evaporator 7. This evaporator 7
The refrigerant gas evaporated therein enters the electric motor 9 through the suction pipe 8. The refrigerant gas that has entered the electric motor 9 cools the internal coil, iron core, etc., and is then sucked into the compressor 1 through the suction port 10. In this way, the refrigerant gas is circulated.

[Problem that the invention seeks to solve]

As described above, the conventional refrigeration system cools the electric motor 9 using the refrigerant gas generated in the evaporator 7. Therefore, if the cooling capacity of this evaporator 7 section is reduced a little and it is used to cool the electric motor 9, the cooling capacity of the refrigeration system will be reduced, and on the other hand, the cooling capacity of the evaporator 7 section will be reduced. If the drop is suppressed, the refrigerant gas, which has been used for cooling in the evaporator 7 and has risen in temperature, is used to cool the motor 9, which reduces the cooling effect of the motor, resulting in an increase in the size of the motor. The dot was hot.

In addition to this device, there was also a conventional method (not shown) in which the motor was directly cooled by the discharged high-pressure refrigerant gas, but this was not possible because the temperature of the discharged refrigerant gas was high. Additionally, there was a problem in that the cooling effect of the electric motor was small, resulting in an increase in the size of the electric motor.

This invention was made in order to solve the above-mentioned problems with the conventional ones, and it is possible to increase the cooling capacity inside the electric motor without reducing the original refrigeration capacity of the refrigeration system, thereby making the electric motor smaller and lighter. Another object of the present invention is to obtain a refrigeration system equipped with a compact condenser that is easy to manufacture.

[Means for solving problems]

The refrigeration system according to the present invention compresses refrigerant gas using a compressor, cools the refrigerant gas compressed by the compressor until it becomes close to saturated gas using the cooler, and cools the refrigerant gas cooled by the cooler. The inside of the electric motor for driving the compressor is cooled by the gas, the refrigerant gas after cooling the inside of the motor is cooled and liquefied by the condenser, and the refrigerant after being liquefied by the condenser is cooled by the evaporator. As well as evaporating the gas,
The cooler and condenser are formed from a single body divided by a partition plate, and the lower side of the cooler and the lower side of the condenser outlet side are connected by a resistance pipe that bypasses the partition plate. be.

[Effect]

In this invention, since the heat exchanger for cooling the refrigerant gas is made into a single body and is partitioned by partition plates, one side partitioned by the partition plate is used as a cooler, and the heat exchanger for cooling the refrigerant gas is used as a cooler. The electric motor is first cooled by the refrigerant gas, and then the refrigerant gas warmed by heat exchange within the electric motor is guided into the other condenser partitioned by the partition plate, where it is cooled and liquefied.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 11 is the compressor 1 and the electric motor 9.
12 is a cooler that cools the refrigerant gas compressed by the compressor 1 until it becomes close to saturated gas, and one section of the conventional condenser is divided into two parts. It consists of
Reference numeral 13 is a conduit for guiding the refrigerant gas cooled by the cooler 12 to the electric motor 9, and 14 is a condenser, which is the other section of a conventional condenser divided into two parts. 15 is a conduit pipe that guides the refrigerant gas after cooling the electric motor 9 to the condenser 14, and 16 is a partition plate that partitions the cooler 12 and the condenser 14, completely blocking these two partitioned parts to make them airtight. ing. Therefore, the cooler 12 and the condenser 14 are formed from a single body separated by the partition plate 16. In addition, in the conventional example shown in FIG. 2, the suction pipe 8 is connected to the suction port 10 leading to the compressor 1 via an electric motor 9, but in FIG. , direct compressor 1
It is connected to an inlet 10 that leads to. Reference numeral 17 denotes a resistance pipe that connects the lower side of the cooler 12 and the lower side of the outflow side of the condenser 14, bypassing the partition plate 16. , providing suitable flow resistance for directing the liquefied gas in the cooler 12 to the condenser 14. Note that, similarly to FIG. 2, the flow of refrigerant gas is indicated by arrows in FIG.

Next, the operation will be explained. The refrigerant gas compressed by the compressor 1 passes through the discharge pipe 2 to the cooler 1.
2, and after being sufficiently cooled from superheated gas to close to saturated gas, it is sent into the compressor drive electric motor 9 through the conduction pipe 13 to cool off the heat generated by the coils, iron core, etc. inside the electric motor 9. After that, it is sent to the condenser 14 through the conduit pipe 15, where it is cooled and liquefied. Note that some of the refrigerant gas in the cooler 12 that has been liquefied in the cooler 12 is transferred to the resistance tube 1.
7 and is led directly into the condenser 14.

The refrigerant gas cooled and liquefied in the condenser 14 is depressurized by the expansion valve 6 and enters the evaporator 7, where it is evaporated and functions as a refrigeration system. The air is fed into the compressor 1 again through the suction port 10.

By doing this, most of the refrigerant gas that has been sufficiently cooled by the cooler 12 can be used for cooling the electric motor 9.
The ability to cool the motor 9 is greatly improved, and the electric motor 9 can be made smaller and lighter to produce the same output.

On the other hand, as mentioned above, the refrigerant gas after cooling the electric motor 9 moves through the condenser 14, the expansion valve 6, and the evaporator 7 in a predetermined circulation cycle, so the refrigerant gas that has moved to the evaporator 7 is There is no need to cool the electric motor 9, and all of it is used to cool the refrigeration system, further improving the capacity of the refrigeration system.

In the above embodiment, a water-cooled cooler 12 and a condenser 14 have been described, but instead of a water-cooled type in which cooling water is passed through the cooling pipe 4, an air-cooled type or other method may be used in which a cooling medium is passed through the cooling pipe 4. Even if the values are changed, the same effect as in the above embodiment can be obtained.

Further, in order to further improve the cooling effect of the electric motor 9, it is also possible to provide a blower for circulating refrigerant gas inside the electric motor 9.

〔Effect of the invention〕

As described above, according to the present invention, the cooling circulation system of the electric motor is changed so that the electric motor is cooled by the refrigerant gas sent out from the compressor and cooled by the cooler. The cooling capacity inside the motor increases without reducing the cooling capacity of the motor, making it possible to reduce the size and weight of the motor. Since the lower side and the lower side of the condenser outflow side are connected by a resistance pipe that bypasses the partition plate, the cooler and condenser are compact and can share the same cooling water, making manufacturing easier. In addition, since the resistance tube has an appropriate flow resistance, only the liquefied part of the refrigerant gas that is partially liquefied in the cooler can be sent directly to the condenser and used effectively, resulting in cooling. It has the effect of further increasing abilities.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG. 2 is a system diagram showing a conventional refrigeration system.
It is a figure equivalent figure. In the figure, 1... Compressor, 7... Evaporator, 9... Electric motor, 12... Cooler, 14... Condenser, 16... Partition plate, 17... Resistance tube. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A compressor that compresses refrigerant gas, a cooler that cools the refrigerant gas compressed by this compressor until it becomes close to saturated gas, and the interior is cooled by the refrigerant gas cooled by this cooler. a condenser that cools and liquefies the refrigerant gas that has cooled the inside of the motor; and an evaporator that evaporates the liquefied refrigerant gas that has been cooled by the condenser. The container and the condenser are formed from a single container body divided by a partition plate, and the lower side of the cooler and the lower side of the condenser outlet side are connected by a resistance pipe that bypasses the partition plate. Refrigeration equipment.