KR100661702B1 - Turbo compressor - Google Patents

Abstract

A turbo compressor is provided to realize a compact turbo compressor by supplying a small-sized turbo machine maximizing the efficiencies of a motor and an inverter. A turbo compressor includes a machine section and a control section. The machine section includes a support section, a first compression section, a second compression section, and a cooling section. The control section includes an inverter, a display screen, a detection unit, a manipulation unit, a regulation unit, and a power supply unit. The regulation unit recognizes an input signal from the manipulation unit and logically calculates the input signal and transmits an output signal to the inverter and the display screen.

Description

Turbo Compressor

1 is a view showing the configuration of a conventional general turbomachine,

2 is a view showing the overall configuration of a turbocompressor according to the present invention,

3 is a cross-sectional view showing a first embodiment of a turbocompressor mechanical part according to the present invention;

4 is a cross-sectional view showing a second embodiment of the turbocompressor mechanical unit according to the present invention;

5 is a configuration conceptual view showing a third embodiment of the turbocompressor mechanical unit according to the present invention;

6 is a configuration conceptual view showing a fourth embodiment of the turbocompressor mechanical unit according to the present invention;

7 is a view showing the characteristics of the turbo compressor control unit according to the present invention,

8 shows a display screen and operation means of the turbo compressor control unit according to the present invention.

<Description of the code | symbol about the principal part of drawing>

1: mechanical part 2: control unit

3: exterior part 11: drive shaft

12: rotor 13: stator

14: heat sink fins 15, 65: intercooler

21, 71: casing 24, 74, 75: bearing housing

26: radial bearing 27: thrust bearing

31, 81: first impeller 32, 82: first diffuser

33, 83: first shroud 34, 84: first volute casing

35, 85: first air circulation passage 36, 86: second impeller

37, 87: second diffuser 38, 88: second shroud

39, 89: second volute casing 40, 90: second air circulation passage

41: air inlet 51: power supply means

52: display screen 53: control means

54: operating means 55: inverter

56: sensing means 61: first axis

62: first rotor 63: first stator

64: first heat sink fin 91: second axis

92: second rotor 93: second stator

94: second heat sink fin

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbo compressor that rotates at high speed, and more particularly, to the overall configuration of a turbo compressor, and more particularly to the characteristics of the mechanical part compression portion of each element of the turbo compressor that constitutes the product.

Fluid machines can be largely divided into volume machines and turbo machines.

A volumetric machine uses a piston or vane, such as a reciprocating type or a rotating type, by sucking and compressing a refrigerant and then discharging the refrigerant, where the fluid is sucked into a confined space. Is separated from the suction portion or the discharge portion, and during this time work is performed. On the other hand, the turbo machine is a method of sucking, compressing and discharging the fluid by the rotating element. That is, to increase the pressure in the continuously flowing fluid, it is classified into an axial flow machine when the fluid flows in the axial direction basically, and a centrifugal machine when the fluid flows in the radial direction.

Therefore, in general, in the case of a volumetric machine, the compression ratio is determined by appropriately adjusting the ratio of the suction volume and the discharge volume in order to obtain a desired discharge pressure, in which the overall size is limited within a certain range for the configuration. For example, in order to obtain a desired pressure and flow rate, the size of the suction chamber administration volume and the conditions at the time of discharge act as restrictions on use, and it is difficult to miniaturize because it is difficult to reduce the size.

Turbomachinery is divided into turbo blower and turbo compressor according to pressure and flow rate. A relatively low discharge pressure and a large flow rate are called turbo blowers, and a relatively high discharge pressure and a low flow rate are called turbo compressors.

Conventional volumetric compressors, such as reciprocating compressors and rotary compressors, obtain a pressure ratio by appropriately adjusting the ratio of the suction volume and the discharge volume in order to obtain a desired discharge pressure. However, turbomachines such as turbocompressors have a blade shape of a rotary impeller. Even if it is designed optimally, due to various factors such as workability, mass production, and durability, it is difficult to obtain a desired high pressure ratio with only one compression.

Therefore, it is the turbocompressor that performs the multi-stage compression to solve this problem.

However, this multi-stage compression is different from the case of using other fluids, when using the air as a refrigerant, since the temperature of the air itself rises very high, a separate method for cooling it is necessary.

In addition, if a jacket or intercooler for cooling is used, the overall size increases due to the installation space.

Therefore, it is necessary to study the configuration of the turbo compressor of the compact multi-stage compression method capable of efficient cooling.

As is already known, conventional turbomachines have adopted a method using a large torque motor to realize a large capacity, or using a speed increase gear to a motor that rotates at a constant speed to increase the rotation speed. 1 is a view showing such a speed gear type turbomachine, and shows a turbomachine according to the prior art.

The conventional general turbo machine is to connect the shaft 102 to which the impeller 105 is connected to the drive shaft 101 by the gears 103 and 104, and the rotation of the rotor (not shown) connected to the drive shaft 101. When the rotational force is obtained, the rotation speed is increased by the gear ratio of the speed increase gear.

Therefore, even if the drive shaft does not rotate at high speed (usually tens of thousands of RPM or more), the impeller 105 rotates at high speed (usually tens of thousands of RPM or more), and passes through the diffuser 106 by the centrifugal force generated therefrom by the impeller. The compressed gas (Gas) is collected and discharged to the outside.

In this case, the bearing is a general sleeve bearing 107, and since an oil pump 108 is required because lubricant must be used here, waste lubricant is generated. Power loss due to mechanical loss occurs, so the efficiency of mechanical loss reaches about 10% of the required power.

In addition, it is necessary to start the high load about 6 to 10 times of the initial load, and the noise is severe. In terms of maintenance, the problem is that the overhaul of regular disassembly and maintenance is expensive.

Although the gearbox turbomachinery has the advantage of being able to rotate the impeller at high speed without increasing the torque of the motor and the motor itself, it does not significantly reduce the size of the overall system. Due to the problems listed, there was a problem in the industrial field.

In other words, by increasing the diameter of the motor to increase the torque of the motor, the overall size is increased, or even if a gearbox is installed to achieve high speed rotation, the turbomachinery needs to be spaced up due to the configuration of the gearbox. Has increased the overall size of.

As described above, the miniaturization of turbomachinery remains a problem that must be solved in the turbocompressor, which must be equipped with a configuration for multi-stage compression and a separate cooling facility in order to obtain high pressure.

In order to miniaturize such an urgent turbomachinery, attention has recently been focused on commercialization of a small turbomachinery employing an air bearing and an inverter suitable for high speed rotation.

The bearing consists of a journal bearing for supporting radial loads and a thrust bearing for supporting axial thrust, and in the present invention, air bearings have many advantages over conventional ball bearings, magnetic bearings and tilting pad bearings. Apply.

First of all, air bearings have semi-permanent characteristics compared to conventional ball bearings in terms of durability, and there is little need for maintenance or replacement unlike other bearings, and there are no accidents in case of sudden power failure. Better than tilting pad bearings.

In addition, the simple configuration and shape has many advantages over ball bearings or tilting pad bearings, which have a complex oil system.

In addition, air bearings are most suitable for turbomachines where high speed rotation is necessary for miniaturization, for the following reasons.

In machines such as compressors and turbines, the higher the speed, the higher the aerodynamic efficiency. Foil bearings, a form of air bearing, can increase in speed without a speed limit, and as the speed increases, the load bearing capacity increases.

In addition, at very high temperatures, it is generally impossible to use the lubricant as it is pressed. At very low temperatures, the viscosity of the lubricant increases, which leads to a significant increase in frictional losses. It is a great advantage to not be limited by.

The most decisive reason is to maintain a clearance of approximately 0.0005 inches or less for high speed rotations (for example, 2 inch diameter shafts driven at 36000 RPM). For a typical ball bearing, the temperature rise and centrifugal force alone will cause a difference of 0.002 inches. It can be concluded that structurally only foil bearings are suitable for high speed rotation.

The following shows the advantages of foil air bearings.

Compared with other bearing systems, the number of parts required to support the rotating body is small and the oil supply system is not required, so the reliability is excellent. An air film between the bearing and the shaft during operation prevents the wear of the foil. The bearing surface is in contact only at start and stop, at which time the coating on the foil surface suppresses wear.

Maintenance costs are reduced because there is less need to check or replace the lubricant.

It can be operated in working fluids other than air such as helium (He), xenon, refrigerant, liquid oxygen, liquid nitrogen, and the like.

However, despite the advantages of these air bearings for stable operation, the number of revolutions should be more than a certain RPM, in order to achieve the present invention by using an inverter, by increasing the number of revolutions early in the air bearing to be able to operate stably. .

However, in this case, there is a difficulty in matching between the drive unit of the turbomachine and the control unit for controlling the same. For example, the inverter (Inverter) that controls the flow rate / pressure by adjusting the rotational speed of the motor is important for stability and reliability, by configuring a sequence circuit for matching the inverter and the motor, the motor and The efficiency of the inverter must be maximized. Otherwise, heat and noise can be generated as a result of losses.

In order to solve this problem, a reactor may be used, but an additional cost may be raised.

The present invention to solve the problems described above, by matching the inverter with the motor for the rotation speed control and the flow rate control in the turbo compressor applying a high speed motor and air bearing rotating at high speed, to maximize the efficiency of the motor and inverter It is an object of the present invention to provide a small turbo compressor of a multi-stage compression method of high efficiency, eco-friendliness, light weight and small size.

In order to achieve the above object, a turbo machine according to the present invention includes a drive part including a drive shaft, a stator having a rotor integrally pressed into the drive shaft, and an inner circumferential surface at regular intervals from the outer circumferential surface of the rotor; A support part configured to support the driving part, the casing capable of circulating air therein, an air bearing and a bearing housing; A first impeller connected to the drive shaft, a first air circulation passage through which air is circulated to the front suction side of the first impeller, a first diffuser installed on an outer circumferential surface of the rear side of the first impeller, and a first communicated with the first diffuser A first compression portion consisting of one shroud and a first volute casing; A second air circulation passage for circulating the air compressed in the first compression portion to the front suction side of the second impeller connected to the same drive shaft as the first impeller, a second diffuser installed on the rear outer circumferential surface of the second impeller; A second compression portion composed of a second shroud communicating with the second diffuser and a second volute casing; A cooling part including an air inlet formed at one side of the casing, an air circulation space in the casing, and a heat radiation fin formed at an outer side of the stator; An inverter for supplying a sufficient starting current to the mechanical part and the mechanical drive part, a display screen, sensing means for sensing pressure and temperature, operating means having a button, and a drive shaft rotation of the driving part. In order to control the number, the sensing means detects the movement state such as the pressure and temperature of the mechanical part, recognizes the input signal by the operation means, calculates it logically, and sends the output signal to the inverter and the display panel. Turbo compressor characterized in that composed of a control unit including an adjusting means and a power supply means.

The turbocompressor for a preferred embodiment of the present invention is characterized by a turbocompressor having a mechanical part and a control part as an exterior part including the inside thereof.

In addition, the outer portion of the turbocompressor for the further preferred embodiment of the present invention is characterized in that it comprises a noise blocking plate which is installed to block the noise of the air sucked.

Hereinafter, the configuration and operation of the turbocompressor according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing an embodiment of a turbo compressor of the multistage compression method according to the present invention.

As shown in FIG. 2, the turbocompressor according to the present invention is composed of a mechanical part 1, a control part 2, and an exterior part 3. The mechanical part 1 includes a driving part, a supporting part, a compression part, and It consists of a cooling part, the control unit 2 is composed of an inverter, adjusting means and other accessory circuits installed to control the drive shaft rotational speed of the drive part of the mechanical part. In addition, the exterior part 3 includes the mechanical part 1 and the control part 2 therein, and a means for blocking the noise of air sucked into the air inlet 41 of the mechanical part on one side of the exterior part. Thus, the noise blocking plate 301 is provided.

3 is a cross-sectional view of the mechanical part of the turbocompressor according to the first embodiment of the present invention, which shows an overall configuration in which the drive part / support part and the compression part are respectively combined in separate configurations, and the drive part is the drive shaft 11. And a motor composed of a rotor 12 and a stator 13, and a supporting portion is formed for their support and protection.

The support part consists of bearings 26, 27 and bearing housing 24, wherein the bearing is a multi-lobed foil air bearing, consisting of a journal bearing 26 and a thrust bearing 27.

In addition, the bearing housing 24 is fixed to the casing 21 for accommodating the bearing.

An air inlet 41 is installed on one side of the casing 21 surrounding the outside, which is one element of the support part, and on the other side, the first air after the sucked air cools the inside. It is to be discharged through the circulation passage (35).

By installing a heat dissipation fin 14 on the outer circumferential surface of the stator 13 in the turbomachine to facilitate heat exchange, the air sucked through the air inlet 41 is coiled by the heat dissipation fin 14 and the stator 13. Will be cooled directly.

In addition, the first compression portion composed of the first impeller 31, the first diffuser 32, the first shroud 33, and the first volute casing 34 is discharged through the first air circulation passage 35. The first stage of the compression process is performed by sucking the air to be increased or compressed by a predetermined pressure and then discharging the air to the second compression chamber through the second air circulation passage 40.

The air discharged through the second air circulation passage 40 includes the second impeller 36, the second diffuser 37, and the second shroud 38 connected to the same drive shaft 11 as the first impeller 31. And the second compressed portion consisting of the second volute casing 39 are discharged at a desired final pressure and flow rate.

That is, while the power generated by the induced current of the rotor 12 and the stator 13 of the drive portion is transmitted to the first impeller 31 through the drive shaft 11, the impeller is rotated and thereby The suctioned air has a positive pressure inside the impeller and at the same time has a centrifugal force through the first diffuser 32, the kinetic energy is led to the rise of the pressure head by the centrifugal force, the compressed high-temperature high-pressure air is the first volute casings Collected from the 34 and discharged to the second impeller 36, the positive pressure rises inside the second impeller 36 and at the same time has a centrifugal force and passes through the second diffuser 37 to move by the centrifugal force. The high temperature and high pressure air, in which energy leads to an increase in the pressure head and is compressed to a desired pressure, is collected in the second volute casings 39 to end the multistage compression.

In addition, the heat of the compressed portion, which becomes high temperature due to the compressed and discharged high-temperature air, is blocked by the seal surface, thereby preventing heat from being transferred into the casing 21 through the bearing housing 24.

In addition, an intercooler 15 is installed on the second air circulation passage 40 as a heat exchanger for lowering the temperature of the first stage compressed air.

7 is a view showing a sequence configuration diagram of the control unit of the turbocompressor according to the present invention, the power supply means 51, the display screen 52, the adjusting means 53, the operation means 54, the inverter 55 and Sensing means 56 or the like.

The inverter 55 is used for the following reasons. In order to reduce the variable capacity and power cost, the speed needs to be changed, and it is a means to change the frequency of the motor supply power for the variable speed.

In the case of turbomachines employing air bearings, the shorter time is usually within a few seconds, since the shorter the time for the rotor 12 of the motor to reach the critical speed that can be supported by the air bearing 26, the better. The motor is designed in consideration of electrical and mechanical characteristics such as starting characteristics to reach a limit rotational speed capable of supporting the rotor 12 at the time of supplying sufficient starting current to the motor. Since the inverter 55 plays a role, the inverter becomes an important means of the system for controlling the mechanical part.

Therefore, the inverter should be free from electrical and mechanical problems, and should be able to perform its function smoothly with various control components for the control.

In addition, the control unit recognizes the input signal detected through the sensing means 56, which is a sensor for detecting the operating pressure and temperature of the mechanical part, and the state input by the operation means 54 having a button and logically calculates the input signal. And an adjusting means 53 for transmitting an output signal to the inverter 55 and the display screen 52.

8 shows a display screen and an operation means, which is one of the turbomachine control units according to the present invention, in one embodiment, wherein the motor and the rotor 12 and the stator 13 of the driving portion of the mechanical part in real time through the display screen. By showing the status of) clearly, you can switch the screen by using the cursor buttons to perform the control smoothly.

It displays the initial screen and the respective discharge pressure, discharge air temperature, intake air temperature, and if necessary, displays the filter 302 exchange pressure. When the filter exchange pressure is reached, a buzzer sounds and the system stops. In addition, it displays differential pressure, motor current, power supply voltage, and also displays reservation time, total operation time, current operation time, and total operation frequency.

In addition, a message is displayed when an error occurs through the display screen. Each error includes an inverter error, a motor error, a controller error as a control means, and a power supply error as a power supply means.

The operation of the operation means is performed by various buttons. For example, in the case of the present invention, as an embodiment, the movement input button 54-1, the on / off operation key 54-1 (Run button), the stop button 54-5 (Stop button), the reset button (54-6: Reset button), each feature is as follows.

The movement of the movement input button 54-1 may be moved to each mode by using the left and right cursor buttons and the value may be changed by using the up and down cursor buttons. Press and hold the Enter button to change the operation mode. At this time, the selected operation mode will blink.

If the buzzer or beacon is activated when an error occurs, press and hold the reset / buzzer stop button once to stop the buzzer or the beacon and return to the normal mode. do.

In addition, when an emergency occurs, the emergency stop button 54-3 may be operated like the stop button 54-5.

That is, all the power switch on the operation means, the on / off operation key to the on position to press the operation button (54-4) to operate the turbomachine, press the stop button (54-5) It will stop working. In case of emergency, press the emergency stop button (54-3) to stop the operation.After removing the hazard, turn the emergency stop (54-3) clockwise to release it, and press the reset button (54-6) to normal operation. Will switch to the mode. When the operation is stopped for a long time, the on / off operation key may be placed in the off position and the power may be adjusted to the off state.

A second embodiment of the turbocompressor according to the present invention includes a first rotor and a second shaft, a first rotor and a second rotor integrally press-fitted to the first shaft and the second shaft, respectively, and the first rotation. A driving portion composed of each of the first stator and the second stator having an inner circumferential surface at regular intervals from the outer circumferential surface of the electron and the second rotor; A support part configured to support the driving part, the casing capable of circulating air therein, an air bearing and a bearing housing; A first impeller connected to the first shaft, a first air circulation passage through which air is circulated to the front suction side of the first impeller, a first diffuser provided on a rear outer circumferential surface of the first impeller, and the first diffuser are in communication with each other. A first compression portion composed of a first shroud and a first volute casing; A second air circulation passage for circulating the air compressed by the first compression portion to the front suction side of the second impeller connected to the second shaft, a second diffuser installed on the rear outer circumferential surface of the second impeller, and the second diffuser A second compression portion configured to communicate with the second shroud and a second volute casing; An air inlet formed at one side of the casing, an air circulation space in the casing, first and second heat dissipation fins respectively formed on the outside of the first stator and the second stator, and air compressed on the second air circulation passage And a cooling part comprising a heat exchanger configured to perform heat exchange with the inverter, an inverter for supplying sufficient starting current to the driving part of the mechanical part, a display surface, sensing means for sensing pressure and temperature, and a button. In order to control the driving means and the drive shaft rotational speed of the drive portion, the sensing means for detecting the operating state such as the pressure and temperature of the mechanical portion, and recognizes the input signal by the operation means to logically calculate this And a control unit including a control means and a power supply means for transmitting an output signal to the inverter and the display screen. Characterized in that configured.

4 is a cross-sectional view of the mechanical part of the turbocompressor according to the second embodiment of the present invention, and shows an overall configuration in which the driving part / support part and the compression part are respectively combined in separate configurations, and the driving part is formed on the first shaft ( 61 and a motor composed of a second shaft 91 and a first rotor 62, a second rotor 92, a first stator 63, and a second stator 93, and their support and Supports are formed for protection.

The support part consists of bearings 26, 27 and bearing housings 74, 75, wherein the bearing is a multi-foil foil bearing, consisting of a journal bearing 26 and a thrust bearing 27.

In addition, the bearing housings 74 and 75 are fixed to the casing 71 for accommodating the bearings.

An air inlet 41 is installed on one side of the casing 71 surrounding the outside, which is an element of the support part, and on the other side, the first air after the sucked air cools the inside. It is to be discharged through the circulation passage (85).

The air inlet 41 is provided on the outer circumferential surfaces of the first stator 63 and the second stator 93 in the turbomachine by installing the first heat dissipation fin 64 and the second heat dissipation fin 94 to facilitate heat exchange. Air sucked in directly cools the radiating fins and the coils of the stators.

In addition, the first compression portion composed of the first impeller 81, the first diffuser 82, the first shroud 83, and the first volute casing 84 is discharged through the first air circulation passage 85. The first stage of the compression process is performed by inhaling the air to be increased or compressed by a predetermined pressure, and then discharging the air to the second compression chamber through the second air circulation passage 90.

Air passing through the second air circulation passage 90 is connected to the second shaft 91, the second impeller 86, the second diffuser 87, the second shroud 88 and the second volute casing In the second compression part constituted by 89, discharge is performed at a desired final pressure and flow rate.

That is, while the power generated by the first rotor 62 and the induced current of the first stator 63 of the drive portion is transmitted to the first impeller 81 through the first shaft 61, The impeller rotates and the air sucked by this increases the static pressure inside the impeller and at the same time passes through the first diffuser 82 with the centrifugal force, the kinetic energy leads to the rise of the pressure head by the centrifugal force, and the compressed hot air is compressed. Is collected in the first volute casings 84 and is discharged back to the second impeller 86, again in the same principle, inducing currents of the second rotor 92 and the second stator 93. As the power generated by the second impeller 86 is transmitted through the second shaft 91, the second impeller 86 rotates, thereby causing the air compressed and sucked in the first stage to be transferred to the second impeller 86. Positive pressure rises inside the impeller 86 and at the same time centrifugal force With air of the compressed high-temperature and pressure while passing through the second diffuser (87) to a pressure movement energy by the centrifugal force, the desired leads to the increase of the pressure head is finished the collected multi-stage compression in the second route the casing of unit 89 to view.

In addition, the heat of the compressed portion, which becomes a high temperature due to the compressed and discharged high-temperature air, is blocked by the seal surface, thereby preventing heat from being transferred into the casing 71 through the bearing housings 74 and 75. do.

In addition, in order to further implement the present invention, an intercooler 65 is installed on the second air circulation passage 90 as a heat exchanger for lowering the temperature of the first stage compressed air.

The configuration, features, and operation principle of the control unit and the exterior unit of the turbocompressor according to the second embodiment of the present invention are the same as the first embodiment described above, and thus redundant descriptions thereof will be omitted.

5 and 6 are conceptual views showing still another possible example of the present invention, and may be referred to as an application of the first and second embodiments.

Therefore, the above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of application of the present invention is not limited thereto, and may be appropriately changed within the scope of the same idea.

As described above, in the present invention, in the multi-stage compression type turbocompressor to which the high speed motor and the air bearing are applied, the inverter for the rotation speed control and the flow rate control is matched with the motor, thereby maximizing the efficiency of the motor and the inverter. Miniaturization of the turbo compressor was realized by supplying a small turbocharger.

Claims (2)

A drive portion comprising a drive shaft, a rotor integrally press-fitted to the drive shaft, and a stator having an inner circumferential surface at regular intervals from the outer circumference of the rotor; A support part for supporting the drive part, the support part including a casing capable of circulating air therein, an air bearing and a bearing housing; A first impeller connected to the drive shaft, a first air circulation passage for circulating air to the front suction side of the first impeller, a first diffuser installed on a rear outer circumferential surface of the first impeller, and a first communicator communicating with the first diffuser A first compression portion consisting of one shroud and a first volute casing; A second air circulation passage for circulating the air compressed in the first compression portion to the front suction side of the second impeller connected to the same drive shaft as the first impeller, a second diffuser installed on the rear outer circumferential surface of the second impeller; A second compression portion composed of a second shroud communicating with the second diffuser and a second volute casing; And a cooling unit including an air inlet formed at one side of the casing, an air circulation space in the casing, a heat dissipation fin formed at an outer side of the stator, and a heat exchanger configured to perform heat exchange with air compressed on the second air circulation passage. Mechanical Department, An inverter for supplying a sufficient starting current to the driving part of the machine, a display screen, sensing means for sensing pressure and temperature, operating means including a button, and for controlling the drive shaft rotational speed of the driving part; Control means and power for sensing the operating state such as pressure and temperature of the machine unit through the sensing means, and recognizes the input signal by the operation means to logically calculate it and send the output signal to the inverter and the display screen Turbo compressor comprising a control unit including a supply means. The first and second shafts, and the first rotor and the second rotor integrally pressed into the first and second shafts, respectively, and a constant distance from the outer peripheral surface of the first rotor and the second rotor A driving portion composed of each of the first stator and the second stator having an inner circumferential surface thereof; A support part configured to support the driving part, the casing capable of circulating air therein, an air bearing and a bearing housing; A first impeller connected to the first shaft, a first air circulation passage through which air is circulated to the front suction side of the first impeller, a first diffuser installed on an outer circumferential surface of the rear side of the first impeller, and the first diffuser are in communication with each other. A first compression portion composed of a first shroud and a first volute casing; A second air circulation passage for circulating the air compressed by the first compression portion to the front suction side of the second impeller connected to the second shaft, a second diffuser installed on the rear outer circumferential surface of the second impeller, and the second diffuser A second compression portion configured to communicate with the second shroud and a second volute casing; An air inlet formed at one side of the casing, an air circulation space in the casing, first heat dissipation fins and second heat dissipation fins respectively formed on the outer side of the first stator and the second stator, and compressed on the second air circulation passage A mechanical part comprising a cooling part configured of a heat exchanger configured to perform heat exchange with air; An inverter for supplying a sufficient starting current to the driving part of the machine, a display screen, sensing means for sensing pressure and temperature, operating means including a button, and for controlling the drive shaft rotational speed of the driving part; Control means and power supply for sensing the operating state such as pressure and temperature of the mechanical unit through the sensing means, recognizes the input signal by the operation means and logically calculates it and then sends the output signal to the inverter and the display screen Turbo compressor comprising a control unit including means.

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