KR101373070B1 - Gas compressor with high speed impeller and gas compressor system including the same - Google Patents

Abstract

A gas compression device and a gas compression system using an ultra-high speed rotating body are disclosed. According to an aspect of the present invention, there is provided a gas compression device comprising: a motor including a motor housing, a water film bearing installed in the motor housing, and a motor cooling unit configured to distribute coolant to a space inside the motor housing; An impeller housing having a rotating impeller, and an impeller housing cooling unit formed to form a gas compression chamber in which gas is compressed by the rotation of the impeller, the coolant being in direct contact with and flowing through the surface of the impeller, and in one aspect of the present invention, The gas compression system according to the present invention includes the above-described gas compression device, a water film bearing of the motor, the motor cooling unit, a cooling water supply unit for circulating cooling water in the impeller housing cooling unit, and a radiator for cooling the heated cooling water.

Description

Gas compressor with high speed impeller and gas compression system including same {Gas compressor with high speed impeller and gas compressor system including the same}

The present invention relates to a rotary gas compression device and a gas compression system including the same. More specifically, the gas compression device and the device comprising a motor for rotating the impeller at high speed to compress the gas at high temperature (100 ~ 150 ℃) and high pressure (1 ~ 3 bar_absolute air pressure) and increase the compression ratio The present invention relates to a gas compression system comprising a configuration for allowing the cooling of the gas to properly maintain the gas compression performance. Rotary gas compressors and systems comprising them may be applied to systems utilizing, for example, hot steam generated using thermal energy.

In general, a rotary gas compressor, ie a blade that rotates inside the centrifugal pump, is called an impeller. As the impeller rotates, kinetic energy is transmitted to a fluid such as gas, and centrifugal force such as gas generated by the kinetic energy is converted into pressure in the housing, thereby raising the pressure of the gas or the like. Therefore, the higher the rotational speed of the impeller, the higher the compression ratio of the gas. However, when the impeller rotates quickly, severe friction occurs in the bearing supporting the rotating shaft.

Bearings generally support the load of the rotating shaft and are means to keep the movement smooth. In addition to the high speed of machinery, the direct contact method has recently been developed and used indirect contact air foil bearings which inject a gas between the rotating shaft and the fixed body to form a constant dynamic pressure. Due to the presence of air in the foil between the rotating shaft and the bearing housing, the frictional resistance is remarkably small compared to other direct contact bearings, which enables high speed rotation and low power consumption.

Air foil bearings are used to radially support rotating shafts rotating at high speeds in turbomachines such as turbocompressors, turbocoolers and turbogenerators. The air foil bearing is provided so that elastic foils overlap each other inside the cylindrical housing, and a rotation shaft is rotatably provided inside the foil. When the rotating shaft is rotated at a high speed of about 20,000 RPM, dynamic pressure is generated in the space between the foil and the rotating shaft, and the foil is elastically deformed away from the rotating shaft by the dynamic pressure of the air, and an air gap between the rotating shaft and the foil ), The rotating shaft can rotate without direct friction with the foil.

In the configuration in which the impeller is installed on the rotating shaft of the motor to rotate, the air foil bearing is provided between the housing and the rotating shaft of the motor for smooth rotation of the rotating shaft connected to the rotor rotatably installed with respect to the stator of the motor. At this time, when the rotor and the rotating shaft rotates at a high speed, the rotating shaft may be heated and deformed by heat generated by friction and heat generated from the coil of the motor, as well as expand the rotating shaft and the air foil bearing, and the air density inside the bearing becomes low. Dynamic pressure falls. As a result, the air foil bearing cannot withstand the load of the rotating shaft, and the thermally expanded rotating shaft comes into direct contact with the friction surface of the air foil bearing, so that the rotating shaft does not rotate smoothly. If friction is intensified, thermal fusion of the rotating shaft and the foil bearing may occur. have.

In fact, if the rotational speed of the rotating shaft increases in the motor with the air foil bearing and rotates at a very high speed, the bearing capacity of the air foil bearing increases up to a certain rotational speed due to the increase in dynamic pressure, but if the rotational speed of the rotating shaft exceeds 50,000 RPM, Due to the heat generated from the and coils, the density of the air decreases, but the rotational shaft bearing capacity decreases.

Air foil bearings can be applied to rotary gas compressors that compress high-temperature (100-150 ° C), high-pressure (1-3 bar_absolute air pressure) gases by high-speed impellers of more than 50,000 RPM (rpm). In this case, the density of the gas decreases due to a significant increase in the temperature of the gas due to the substantial heat of friction between the rotating shaft and the air foil bearing, so that the gas pressure for supporting the rotating body is weakened, thereby making it impossible to operate at high speed. In order to solve this problem, it is necessary to improve the bearing to maintain the dynamic pressure inside the bearing even at high speed of rotation.

In addition, since heat generated in the coil of the motor is transmitted to the bearing and adversely affects, a means for effectively cooling the stator and the coil portion that mainly generate heat in the motor is also required. On the other hand, the temperature is also accompanied by the process of compressing the gas by the impeller. If heat generated at this time is accumulated in the impeller housing or the like, the density of the compressed gas can be reduced, so that a means for cooling the impeller housing is also required.

In order to solve the above problems, the gas compression apparatus using an ultra-high speed rotating body according to the present invention, the rotating shaft having a rotor, a stator disposed around the rotor, and to support to rotate a portion of the rotating shaft A motor including a water film bearing; An impeller connected to the rotating shaft of the motor and integrally rotating with the rotating shaft; And an impeller housing installed on a side where the impeller outside the motor is installed to form a gas compression chamber through which the gas is compressed by the rotation of the impeller, and having an impeller housing cooling part formed so that the coolant contacts and flows directly on the surface thereof. .

Here, the motor includes a motor housing surrounding the stator; A motor cooling unit configured to distribute coolant to the remaining space except the rotating shaft, the water film bearing, and the stator in the motor housing; And by covering at least a portion of the stator surface, it may include a waterproof mold to block the coolant circulating in the motor cooling unit from touching the coil wound on the stator. The waterproof mold may be made of silicon.

The impeller housing cooling unit may include a trench structure in which an outer surface of the impeller housing is recessed toward the gas compression chamber.

On the other hand, the water film bearing, the bearing housing is provided with a fluid injection tube surrounding a portion of the rotating shaft, the fluid supply from the outer peripheral surface far from the rotating shaft to the inner peripheral surface facing the rotating shaft; And it may include a foil (foil) provided on the inner peripheral surface of the bearing housing. The foil includes a top foil; And a bump foil positioned between the top foil and the bearing housing. In addition, the gas compression device having such a water film bearing includes: a motor housing surrounding the stator; A first fluid supply port provided at one side of the motor housing; A second fluid supply port provided on an outer circumferential surface of the bearing housing so as to communicate with the fluid injection pipe; A connection pipe connecting the first fluid supply port and the second fluid supply port inside the motor housing; And a drain provided at one side of the motor housing to allow the fluid inside to be discharged to the outside.

According to one embodiment of the present invention, there is provided a gas compression device, comprising: a motor including a rotating shaft having a rotor, a stator disposed around the rotor, and a water film bearing for supporting a portion of the rotating shaft; An impeller connected to the rotating shaft of the motor and integrally rotating with the rotating shaft; And an impeller housing installed on a side where the impeller outside the motor is installed to form a gas compression chamber through which the gas is compressed by the rotation of the impeller, and having an impeller housing cooling part formed so that the coolant directly contacts and flows on the surface thereof. Wherein the motor comprises: a motor housing surrounding the stator; A motor cooling unit configured to distribute coolant to the remaining space except the rotating shaft, the water film bearing, and the stator in the motor housing; And a waterproof mold covering at least a portion of the stator surface to prevent the coolant circulating in the motor cooling unit from contacting the coil wound on the stator. A bearing housing having a fluid injection tube surrounding a portion and supplying a fluid from an outer circumferential surface far from the rotation shaft to an inner circumferential surface facing the rotation shaft; And it may include a foil (foil) provided on the inner peripheral surface of the bearing housing.

According to an aspect of the present invention, there is provided a gas compression system comprising: a motor including a motor housing, a water film bearing installed inside the motor housing, and a motor cooling unit configured to distribute coolant to a space inside the motor housing; A gas compression apparatus including an impeller housing having a rotating impeller and an impeller housing cooling unit formed to form a gas compression chamber in which gas is compressed by the rotation of the impeller, and the coolant directly contacts and flows on a surface thereof; A coolant supply unit configured to circulate a coolant to the water film bearing, the motor cooling unit, and the impeller housing cooling unit of the motor; And a radiator for cooling the heated cooling water.

Here, the cooling water having passed through the water film bearing or the motor cooling unit may be supplied to the impeller housing cooling unit, and the cooling water having passed through the impeller housing cooling unit may be cooled through a radiator.

According to the present invention, the water film foil bearing is applied to the rotating shaft of the motor and the rotating body, that is, the impeller, and effectively discharges the heat so that the heat generated from the motor does not affect the bearing, thereby making it possible to achieve high speed rotation of 50,000 RPM or more. have. In addition, by effectively cooling the impeller housing together with the ultra-fast rotation of the impeller, there is an effect of providing a high-temperature, high-pressure gas compressor that has a temperature of compressed gas, for example, water vapor up to 190 ° C., and an elevated pressure of the compressor body of 3 bar or more.

In addition, according to the present invention, to provide a gas compression system for efficiently and efficiently operating the gas compression device by circulating the cooling water efficiently to the water film bearing, the motor cooling unit and the impeller housing cooling unit of the gas compression device. It works.

1 is a cross-sectional view showing the inside of a gas compression apparatus according to an embodiment of the present invention.
Figure 2 is a perspective view showing the outside of the gas compression apparatus according to an embodiment of the present invention.
Figure 3 is a block diagram showing the configuration of a gas compression system according to an embodiment of the present invention.
4 is an enlarged view of the water film bearing portion of the gas compression apparatus according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view illustrating a cross section along AA of FIG. 4.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The technical idea of the present invention can be clearly understood through the examples. In addition, it is apparent to those skilled in the art that the present invention is not limited to the embodiments described below, but can be modified in various forms within the scope of the technical idea to which the present invention pertains. something to do.

1 is a cross-sectional view showing the inside of a gas compression device according to an embodiment of the present invention, Figure 2 is a perspective view showing the outside of the gas compression device according to an embodiment of the present invention. The gas compression device according to the present embodiment includes a rotary gas compression chamber 231 including a motor including the water film bearing 50 and an impeller 250 connected to the rotation shaft 150 of the motor. The motor includes a motor housing 110, a stator 130 installed inside the motor housing 110, and a rotor 140 installed at the center of the stator 130 to rotate the rotating shaft 150 by electromagnetic force. It includes. The rotary shaft 150 is supported to be rotated by at least one hydromechanical bearing 50. In this embodiment, the hydromechanical bearings 50 are installed at both ends of the rotary shaft 150, respectively.

The water film bearing 50 is provided with a bearing housing 10 surrounding a portion of the rotating shaft 150 with a predetermined gap with the rotating shaft 150, and the bearing housing 10 and the rotating shaft 150 In between is supplied a fluid for lubrication, for example water. The fluid is supplied from the outside of the motor, the second fluid supply port 20 is installed to be connected to the first fluid supply port 120 installed in the motor housing 110 and the fluid injection tube 12 inside the bearing housing 10. And the connection pipe 160 connecting them inside the motor. The motor housing 110 has a structure for sealing the internal space, the other side of the motor housing 110 is provided with a drain 170 for discharging the fluid. The connection pipe 160 connects the first fluid supply port 120 and the second fluid supply port 20 so that the fluid supplied from the outside through the first fluid supply port 120 is supplied to the second fluid supply port ( 20) to be delivered. The drain 170 allows the supplied fluid to be discharged to the outside of the motor housing 110 after passing through the water film bearing 50. At least one drain 170 may be provided, and a plurality of drains 170 may be provided as illustrated in the drawing.

When a fluid including water is supplied to the water film bearing 50 through the second fluid supply port 20, the fluid is transferred around the rotation shaft 150 through the fluid injection pipe 12. The rotating shaft 150 rotates at a very high speed by the rotational force of the motor, whereby the supplied fluid forms numerous fine droplets. Such fine droplets increase the density inside the water film bearing 50 including the rotational axis 150 to maintain high rigidity. Fluid is periodically or continuously supplied through the first fluid supply port 120, and the fluid circulated therein is discharged to the outside through the drain 170. In addition, the fine droplets also perform a function of cooling a structure such as a foil (not shown) provided in the rotary shaft 150 and the water film bearing 50, thereby preventing thermal expansion thereof, thereby allowing the rotary shaft 150 to operate at high speed. It can be operated smoothly even if it rotates.

As such, the high rigidity hydromechanical bearing 50 maintains high rigidity by increasing the density around the rotating shaft 150 even in a situation where the rotational speed of the rotating shaft 150 increases to exceed the limit speed of the conventional air foil bearing. It is possible to prevent problems such as heat fusion caused by overheating of the bearing internal structure such as foil and the rotating shaft. In addition, the water film bearing 50 may be applied to a case in which a high pressure is to be formed by ultra-high rotation, such as a steam compressor, by compressing a gas such as steam even by the rotation of the impeller 250 to secure bearing rigidity. In addition, the bearing width (distance between the left end and the right end of the bearing housing 10 in FIG. 1) and the length of the rotating shaft 150 can be sufficiently maintained compared to the conventional general air foil bearings. Therefore, the motor can be miniaturized.

On the other hand, the motor housing 110 is provided with a motor cooling unit 210 which is a space through which the coolant flows, and the motor housing 110 is made of an agent for supplying cooling water to the motor cooling unit 210 from the outside. 1 Cooling water inlet 180 may be provided. Since the stator 130 includes a coil through which electricity flows, a waterproof mold 200 is disposed between the coil of the stator 130 and the motor cooling unit 210 to block a short circuit. The waterproof mold 200 may completely surround the stator 130 or may surround other portions of the stator 130 except for a portion where the coil and the motor housing 110 contact each other. The waterproof mold 200 may be made of an elastic material such as rubber and may be in close contact with the inner wall of the motor housing 110 to prevent the cooling water from flowing into the coil side, such as rubber packing. Since a lot of heat is generated in the coil of the stator 130 during the operation of the motor, the waterproof mold 200 is formed of a material that is heat resistant and relatively high in thermal conductivity, such as silicon rubber or epoxy resin. Can be.

The motor cooling unit 210 may be connected to the drain 170 described above. The coolant injected through the first coolant inlet 180 rotates inside the motor cooler 210 and cools the stator 130, and together with the fluid discharged from the water film bearing 50, the drain 170. Can be discharged through. Unlike the present embodiment, of course, a separate cooling water outlet may be provided in the motor housing. Cooling water may flow into the gap between the stator 130 and the rotor 140 as well as the motor cooling unit 210. In this case, the surface of the rotor 140 in which the introduced cooling water rotates at a high speed. In contact with the water droplets may be formed to assist the function of the water film bearing 50.

Meanwhile, an impeller housing 230 forming a gas compression chamber 231 is disposed at the impeller 250 connected to the rotation shaft 150. The impeller housing 230 is provided with an impeller housing cooling unit 240 which is a space through which coolant flows. The impeller housing cooling part 240 may be disposed in a ring shape along the periphery of the impeller 250. The impeller housing cooling unit 240 may be formed, for example, in a cover covered with a trench formed outside the impeller housing 230, and a second injecting cooling water into the impeller housing cooling unit 240 from the outside. It may be connected to the cooling water inlet 190 and the impeller housing drain 179 for discharging the cooling water.

Looking at the flow of the bearing fluid and the coolant in the gas compression apparatus according to this embodiment with reference to Figure 2, the bearing fluid is injected (Bin) through the first fluid supply port (120), the first coolant inlet ( Cooling water is injected through 180 (Min). The bearing fluid and the coolant joined in the motor housing 110 are discharged to the outside of the motor through the drain 170. Here, the bearing fluid and the cooling water may be the same fluid, and may be water or a fluid mainly composed of water. Meanwhile, the coolant injected through the second coolant inlet 180 (Hin) cools the impeller housing 230 and the gas therein and is discharged to the impeller housing drain 179 (Hout).

Figure 3 is a block diagram showing the configuration of a gas compression system according to an embodiment of the present invention. The gas compression system according to the present embodiment includes a gas compression device according to the embodiment of FIGS. 1 and 2 described above, and includes the water film bearing 50, the motor cooling unit 210, and the impeller housing cooling unit ( Cooling water circulation system including a cooling water supply unit 270 for supplying the cooling water to 240, and a radiator 260 for radiating the cooling water absorbing heat therefrom. Here, assuming that the bearing fluid and the coolant are the same fluid, the same will be described as the coolant. First, the cooling water supply unit 270 supplies cooling water to the water film bearing 50 and the motor cooling unit 210. Cooling water that has formed fine droplets in the water film bearing 50 is combined with the cooling water in the motor cooling unit 210 inside the motor and discharged to the outside of the motor through the drain.

In this case, the cooling water supply unit 270 may supply the cooling water at different pressures and flow rates to the water film bearing 50 and the motor cooling unit 210, respectively. Cooling water can also be supplied at different flow rates at the same pressure. For example, the water film bearing 50 side may be injected with 0.1 to 10 liters of water per minute at an absolute pressure of 2 to 6 bar, which may be smoothly applied according to the rotational speed of the motor in the water film bearing 50. Can be adjusted to occur. The cooling water of an appropriate flow rate may be injected into the motor cooling unit 210 according to the capacity of the motor cooling unit 210 and the amount of heat generated by the motor in a supply pressure range of a general water supply.

Cooling water discharged through the drain of the motor housing is transferred and supplied to the impeller housing cooling unit 240 again. At this time, the cooling water may be transferred by the discharge pressure from the drain, or if necessary, the cooling water may be transferred using a pump and injected into the impeller housing cooling unit 240. Since the operating temperature of the motor is relatively lower than the operating temperature of the impeller housing, sufficient cooling effect can be obtained even if the coolant discharged through the motor cooling unit 210 is injected into the impeller housing cooling unit 240. And cooling water can be utilized efficiently.

The gas inside the impeller housing is very high in temperature, and heat is further generated due to compression of the gas by the impeller, friction between the gas and the impeller, and the like. For example, the temperature of the steam whose pressure is increased by about 1 bar by the impeller may reach 190 ° C or more. Therefore, since the coolant passing through the impeller housing cooler 240 also has a high temperature, the coolant may be recycled by being cooled again through the radiator 260 and then sent to the coolant supply unit 270. The radiator 260 is a device for lowering the temperature of the cooling water by dissipating heat to the outside, an air-cooled cooling tower or a water-cooled cooling tower may be applied.

4 is an enlarged view of an extract of a water film bearing portion of a gas compression apparatus according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating the A-A cross section of FIG. 4. 4 shows a cross section parallel to the longitudinal direction of the rotary shaft, and FIG. 5 shows a cross section perpendicular to the longitudinal direction of the rotary shaft.

4 and 5, the hydromechanical bearing according to the embodiment of the present invention includes a bearing housing 10, a fluid supply port 20, and a foil 30. Herein, the fluid may be any liquid as long as it is a liquid having a higher density than air as well as water or a liquid mainly composed of water. However, in the present embodiment, it is preferable to apply the same fluid to the bearing fluid and the cooling water.

The bearing housing 10 is a part forming the outer shape of the water film bearing, and the foil 30 and the rotation shaft 150 are inserted therein. The bearing housing 10 has a fluid injection tube 12 and a housing coupling portion 14. The fluid injection tube 12 communicates with an end portion of the fluid supply port 20 provided at one side of the bearing housing 10 and injects the fluid supplied through the fluid supply port 20 in the direction of the foil 30. . The housing coupling portion 14 serves to fix the water film bearing to the motor housing 110. The fluid supply port 20 is provided at one side of the bearing housing 10 so that the end portion communicates with the fluid injection tube 12.

The foil 30 is provided on the inner circumferential surface of the bearing housing 10 and is spaced apart from the rotation shaft 150 by a predetermined interval to form a gap between the rotation shaft 150. In one example, the foil 30 may be composed of a top foil 32 and a bump foil 34 as shown in FIG. 5. Such bump type foil bearings are easily damped by friction between the bump foil 34 and the bearing housing 10 or the bump foil 34 and the top foil 32 when the rotating shaft 150 starts and stops. In operation, the rigidity of the spring supporting the rotating shaft 150 has a very excellent characteristic.

When fluid, including water, is supplied through the fluid supply port 20, the fluid is delivered to the rotation shaft 150 through the fluid injection tube 12. The rotating shaft 150 rotates at an extremely high speed, and when a fluid is supplied, it rotates to form a large number of fine droplets. At this time, unlike the water droplets, the fine droplets have a high density because liquid molecules form agglomerates. Since fluids, including water, have a very high density compared to air, when these fine droplets are sprayed on the rotational shaft 150 and the foil 30, the temperature of the bearing including the foil 30 is decreased and the density is increased to increase the high rigidity. To maintain.

In addition, by performing the cooling function of the foil 30 and the rotating shaft 150 with less liquid molecules, it is possible to prevent the thermal expansion of the foil 30 and the rotating shaft 150 to be smoothly started even if the rotating shaft 150 rotates at a very high speed. To help.

As with general air foil bearings, cooling with air alone is difficult to prevent the degradation of rigidity due to density reduction due to thermal expansion of the bearing and the rotating shaft. However, the water film bearing according to the present invention forms a water screen by droplets between the foil 30 and the rotating shaft 150 so that cooling by air can be added to cooling by air, thereby providing rigidity of the bearing. Can be maximized.

10-bearing housing 20-second fluid supply port
30-foil 50-water bearing
110-motor housing 120-first fluid inlet
130-Stator 140-Rotor
150-axis of rotation 160-connector
170-Drain 210-Motor Cooling Unit
180-First coolant inlet 190-Second coolant inlet

Claims (10)

A rotating shaft having a rotor, a stator disposed around the rotor, and a part of the rotating shaft are supported to rotate, and a fluid is enclosed from the outer circumferential surface surrounding the portion of the rotating shaft to an inner circumferential surface facing the rotating shaft. A motor including a bearing housing including a fluid injection pipe to supply and a water film bearing including a foil provided on an inner circumferential surface of the bearing housing;
An impeller connected to the rotating shaft of the motor and integrally rotating with the rotating shaft; And
And an impeller housing having an impeller housing cooling unit installed on a side where the impeller outside the motor is installed to form a gas compression chamber in which gas is compressed by the rotation of the impeller, and having a coolant contacting and circulating the coolant directly on the surface thereof.
Gas compression device using an ultra high speed rotor. The method of claim 1,
The motor includes:
A motor housing surrounding the stator;
A motor cooling unit configured to distribute coolant to the remaining space except the rotating shaft, the water film bearing, and the stator in the motor housing; And
Covering at least a portion of the surface of the stator, characterized in that it comprises a waterproof mold, which prevents the coolant flowing in the motor cooling unit from touching the coil wound on the stator, gas compression apparatus using an ultra-high speed rotating body. 3. The method of claim 2,
The waterproof mold is a gas compression device using an ultra-high speed rotating body, characterized in that made of silicon. The method of claim 1,
The impeller housing cooling unit is a gas compression device using an ultra-high speed rotating body, characterized in that the outer surface of the impeller housing includes a trench structure toward the gas compression chamber. delete The method of claim 1,
The foil is,
Top foil; And
And a bump foil positioned between the top foil and the bearing housing. The method of claim 1,
A motor housing surrounding the stator;
A first fluid supply port provided at one side of the motor housing;
A second fluid supply port provided on an outer circumferential surface of the bearing housing so as to communicate with the fluid injection pipe;
A connection pipe connecting the first fluid supply port and the second fluid supply port inside the motor housing; And
And a drain provided at one side of the motor housing to allow the fluid inside to be discharged to the outside. A motor including a rotating shaft having a rotor, a stator disposed around the rotor, and a water film bearing for supporting a portion of the rotating shaft to rotate;
An impeller connected to the rotating shaft of the motor and integrally rotating with the rotating shaft; And
An impeller housing having an impeller housing cooling unit installed on a side where the impeller outside the motor is installed to form a gas compression chamber in which gas is compressed by rotation of the impeller, and having a coolant contacting and circulating the coolant directly on the surface thereof;
Here, the motor,
A motor housing surrounding the stator; A motor cooling unit configured to distribute coolant to the remaining space except the rotating shaft, the water film bearing, and the stator in the motor housing; And a waterproof mold covering at least a portion of the stator surface to block the coolant circulating in the motor cooling unit from touching the coil wound on the stator.
The water film bearing,
A bearing housing surrounding a portion of the rotating shaft and having a fluid injection tube for supplying a fluid from an outer circumferential surface far from the rotating shaft to an inner circumferential surface facing the rotating shaft; And characterized in that it comprises a foil (foil) provided on the inner peripheral surface of the bearing housing,
Gas compression device using an ultra high speed rotor. A motor housing, a rotating shaft having a rotor inside the motor housing, a stator disposed around the rotor, and a portion of the rotating shaft to be rotatable, surrounding a portion of the rotating shaft and extending from an outer circumferential surface away from the rotating shaft. A water film bearing including a bearing housing having a fluid injection tube for supplying a fluid to an inner circumferential surface facing the rotating shaft, and a foil provided on an inner circumferential surface of the bearing housing, and configured to distribute coolant to a space inside the motor housing. An impeller housing cooling unit formed of a motor including a motor cooling unit, an impeller connected to the motor to rotate, and a gas compression chamber in which gas is compressed by the rotation of the impeller, and the coolant is in direct contact with and flows through the surface of the impeller A gas compression device comprising an impeller housing having;
A coolant supply unit configured to circulate a coolant to the water film bearing, the motor cooling unit, and the impeller housing cooling unit of the motor; And
A radiator for cooling the heated coolant,
Gas compression system using ultra high speed rotor. The method of claim 9,
And supplying cooling water having passed through the water film bearing or the motor cooling unit to the impeller housing cooling unit, and cooling the cooling water having passed through the impeller housing cooling unit through a radiator.

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