JPH0519711Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a refrigerator that compresses and liquefies a refrigerant such as fluorocarbon gas and cools objects to be cooled using the liquefied refrigerant.

``Prior Art'' Refrigerators that have been commonly used in the past use a turbo compressor to centrifugally compress a refrigerant such as fluorocarbon gas, which is vaporized by releasing cold energy, into a high-temperature, high-pressure gas. The high-pressure gas is cooled with cooling water to liquefy it, and the object to be cooled is cooled by the liquefied fluorocarbon gas thus obtained.

A hermetic motor is usually used as the drive source for the turbo compressor. This hermetic motor rotates at 3,000 revolutions per minute under a 50 Hz power supply, for example, but in order to centrifugally compress the fluorocarbon gas sufficiently by the turbo compressor, the turbo compressor fan must be rotated every minute.
It is necessary to rotate the motor 10,000 to 15,000 times, and the above hermetic motor cannot directly drive the turbo compressor due to the insufficient number of revolutions. Therefore, conventionally, a speed increasing gear is interposed between the hermetic motor and the turbo compressor to increase the speed.

In addition, in conventional refrigerators, the start control panel for the hermetic motor is installed separately from the hermetic motor, and this motor is cooled by supplying a portion of liquefied fluorocarbon gas. When cooling of the control panel is necessary, air cooling is performed using a blower, etc.

``Problem that the invention attempts to solve'' By the way, in the case of the above-mentioned refrigerator, the hermetic motor and the control panel are arranged separately, and the refrigerant passage system for cooling them is also separately provided. Therefore, it was difficult to reduce the size and weight of the entire refrigerator. At the same time, the speed increasing gear required to increase the rotational speed is relatively large in weight and volume, which hinders the reduction in size and weight of the device.

In addition, in order to operate the speed increasing gear smoothly,
This gear must always be kept moist with lubricating oil, which also poses a problem in that oil maintenance is time-consuming.

"Means for Solving Problems" The refrigerator of the present invention includes a compression pump that compresses refrigerant, an electric motor that drives the compression pump, and a control panel that controls the electric motor. In a refrigerator in which internal parts are cooled using the refrigerant, by inverter control,
A high-speed electric motor that rotates at a rotational speed sufficient to directly drive the compression pump, a sealed upper chamber that accommodates the high-speed electric motor, and a closed upper chamber that stores a liquid refrigerant and stores the refrigerant. a lower chamber that accommodates the inverter at a position below the liquid level of the cooling pump; a supply pipe that supplies refrigerant discharged from the cooling pump to the upper chamber; and a supply pipe that supplies the refrigerant vaporized in the upper chamber to the suction port of the compression pump. The gas exhaust pipe is characterized in that the upper chamber and the lower chamber are communicated with each other.

"Operation" According to the above configuration, the refrigerant from the supply pipe can be supplied to the upper chamber to cool the high-speed electric motor in the upper chamber. Furthermore, the refrigerant that has lost its cooling ability due to vaporization due to cooling the high-speed motor is returned to the compression pump via the gas exhaust pipe, and the liquid refrigerant that has cooling ability is moved downward by gravity. The liquid flows into the chamber and cools the inverter below the liquid level in the lower chamber. In addition, since the inverter is located below the liquid level of the refrigerant in the lower chamber, it will continue to be cooled even after the high-speed motor is stopped. The cooling capacity of the inverter is also maintained, and the possibility of accidents such as burnout can be reduced as much as possible.

"Embodiment" Hereinafter, a refrigerator according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 and FIG. 2 show the main parts of the refrigerator of the embodiment, and reference numeral 1 indicates an inverter control panel (control panel);
1a is a rectangular parallelepiped-shaped casing of an inverter control panel. A spiral compressor 2 (compression pump) for compressing front gas (refrigerant) to high temperature and high pressure is attached to the outer surface of the casing 1a. The vortex compressor 2 is connected to a vaporization chamber and a cooling chamber (not shown), and is configured to compress the vaporized fluorocarbon gas, which is deprived of cold heat in the vaporization chamber, to a high temperature and pressure, and then blows it out into the cooling chamber. In the cooling chamber, the high-temperature, high-pressure gas is cooled with cooling water or the like, converted into liquefied fluorocarbon gas, and sent to the vaporization chamber where the object to be cooled is cooled.

Inside the casing 1a of the control panel 1, a rectangular parallelepiped-shaped airtight casing 4 is housed in the center along with parts 3 constituting the control panel.

The inside of this airtight casing 4 is partitioned into two upper and lower chambers by a partition plate 5. A high-speed electric motor 6 to which power is supplied from the control panel 1 is housed in the upper chamber 4a of these two chambers. This high-speed electric motor 6 is configured to rotate at 10,000 to 15,000 revolutions per minute under inverter control by the control panel 1.
The compressor 2 can be directly driven at a sufficient rotational speed.

The rotating shaft 6a of the high-speed electric motor 6 passes through the airtight casing 4 and the control panel casing 1a in an airtight manner and protrudes to the outside.
A fan 2a of the compressor 2 is directly fixed.

Further, a refrigerant supply pipe 7 and a gas discharge pipe 8 are penetrated into the upper chamber 4a of the airtight casing 4 from the outside of the control panel casing 1.

A part of the liquefied fluorocarbon gas in the vaporization chamber is supplied under pressure to the refrigerant supply pipe 7 by a refrigerant pump (not shown). The tip of the refrigerant pipe 7 is penetrated into the high-speed motor 6 so that the liquefied fluorocarbon gas can be introduced into the motor 6. Further, one end of a pipe 9 extending in the horizontal direction is connected to the refrigerant pipe 7 within the upper chamber 4a of the airtight casing 4. This pipe 9 has a plurality of horizontally oriented spray nozzles 10 attached to its side and is sealed at the other end, and liquefied fluorocarbon gas is sprayed into the upper chamber 4a from these spray nozzles 10. I'm starting to do that.

Four communication holes 11 are formed in the partition plate 5 between the upper chamber 4a and the lower chamber 4b. These communication holes 11... are for passing the refrigerant between the upper chamber 4a and the lower chamber 4b, and the liquefied refrigerant supplied to the upper chamber 4a passes through these communication holes 11... to the lower chamber 4b. The liquid flows in (see the arrow in the figure) and accumulates in the lower chamber 4b.

The lower chamber 4b of the airtight casing 4 accommodates a rectifier 12 and a reactor 13, which generate the largest amount of heat among the components of the control panel 1. The liquefied fluorocarbon gas accumulated in the lower chamber 4b is
The heat generated by these parts 12 and 13 vaporizes the gas, which enters the upper chamber 4a again through the communication holes 11 (see the chain arrow in the figure), and is introduced into the compressor 2 via the gas exhaust pipe 8 and the vaporization chamber, where it is liquefied again. It is becoming more and more common.

On the outer circumferential surface of the airtight casing 4, electronic components 14 that particularly need to be cooled among various components of the control panel are attached. These electronic components 14 are indirectly cooled by the liquefied fluorocarbon gas that is constantly sprinkled inside the airtight casing 4.

In the refrigerator having such a configuration, the high-speed electric motor 6 is housed in the casing 1a of the control panel 1, and these are cooled simultaneously by the refrigerant supply pipe 7 and the gas exhaust pipe 8.
Compared to a refrigerator in which a control panel and an electric motor are arranged separately and a refrigerant supply path is also provided separately, the entire refrigerator can be made smaller and lighter.

Furthermore, since the high-speed electric motor 6 controlled by an inverter is used as the electric motor, a rotational speed sufficient to drive the compressor 2 can be obtained without using a speed increasing gear. Therefore, the bulky and heavy speed increasing gear can be omitted, which also contributes to the miniaturization and weight reduction of the entire device.

Further, by eliminating the speed increasing gear, there is an advantage that the trouble of oil maintenance etc. can be saved and running costs can be reduced.

"Effects of the invention" The refrigerator of the invention has the following excellent effects.

Since the electric motor is housed within the casing of the control panel, these can be cooled simultaneously using the same refrigerant pipe and exhaust pipe, compared to refrigerators where these are placed separately and the refrigerant supply path is also provided separately. The entire device can be made smaller and lighter.

Since a high-speed electric motor controlled by an inverter is used as the electric motor, a rotational speed sufficient to drive the compression pump can be obtained without using a speed increasing gear. Therefore, the bulky and heavy speed increasing gear can be omitted, and the entire device can be made smaller and lighter. Furthermore, by eliminating the speed increasing gear, the effort of supplying oil to the speed increasing gear can be saved.

Since the upper chamber and the lower chamber are arranged one above the other, the inverter can be cooled by guiding the refrigerant, which has a liquid cooling capacity, to the lower chamber by gravity.

Since the inverter is located below the liquid level of the refrigerant, it will continue to be cooled even after the high-speed motor has stopped, so accidents such as burnout will be less likely to occur even in the event of an emergency stop due to overload, etc. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a main part of a refrigerator according to an embodiment of the present invention, and FIG. 2 is a side cross-sectional view of the same part. 1... Inverter control panel, 1a... (control panel) casing, 2... Volute compressor (compression pump), 3, 12, 13, 14... (control panel)
Parts, 6...High-speed electric motor.

Claims (1)

[Claims for Utility Model Registration] A compression pump that compresses a refrigerant, an electric motor that drives the compression pump, and a control panel that controls the electric motor; In a refrigerator configured to cool, the electric motor is controlled by an inverter,
It uses a high-speed electric motor that rotates at a rotation speed sufficient to directly drive the compression pump, and has a sealed upper chamber that accommodates the electric motor, and a lower side of the upper chamber that stores liquid refrigerant. A lower chamber that accommodates the inverter at a position below the liquid level of the refrigerant, a supply pipe that supplies the refrigerant projected from the cooling pump to the upper chamber, and a refrigerant vaporized in the upper chamber to the suction port of the compression pump. What is claimed is: 1. A refrigerator comprising: a gas exhaust pipe for supplying gas; and the upper chamber and the lower chamber communicate with each other.