KR100868267B1 - Turbo blower - Google Patents

Abstract

A turbo blower can prevent the compressed air from leaking between the impeller and the housing since the impeller is connected with the motor shaft so that the motor shaft and the impeller rotate together. A turbo blower includes a motor(10); an air suction scroll which is combined to the motor so that the air is inhaled into the motor; an impeller(50) which compresses the air inhaled through the air suction scroll and is connected to the shaft of the motor and rotates with the motor shaft, and is formed with the cylindrical storage space in the central part; a stationary shaft(70) which is inserted into the storage space of the impeller and fixed to support the impeller with a plurality of rolling bearings; an air discharge scroll(30) which is combined to an end of the stationary shaft and discharges the air compressed in the impeller; and a shroud(40) combined between the air suction scroll and the air discharge scroll while surrounding the impeller.

Description

Turbo blower {TURBO BLOWER}

The present invention relates to a turbo blower. More specifically, the present invention relates to a turbo blower that has a structure in which the impeller coupled to the outside of the central axis rotates without the central axis of the blower rotating, so that there is no pressure loss and the gap between the impeller and the shroud can be easily adjusted.

Turbo machines used to turn impellers, such as turbo blowers or turbo compressors, use high-speed rotors to achieve high output with low volume.

Such a high-speed rotating body is manufactured in such a way that a central rotary shaft coupled to a motor rotates directly while driving an impeller coupled to the rotary shaft. The rotating shaft rotates at the center is supported by a bearing at both ends of the rotating shaft and is directly coupled to the rotating shaft so that the impeller rotates together with the rotating shaft. These impellers can be compressed in a plurality of stages, for example, three stages are continuously coupled.

In the case of a multi-stage blower, the air is compressed once by the first impeller and then further compressed by the number of passes as it passes through the subsequent impeller one step at a time.

In the case of the conventional blower having the above structure, pressure leaks into the gap between the rotating impeller and the fixed housing, or compressed air leaks through the gap between the coupling shaft (eg, the bearing) between the rotating shaft and the air outlet. do.

When the compressed air is leaked, the pressure in the device is not only lost, but also the lubricant injected for driving the bearing is leaked. In addition, when the gas or the flammable gas is compressed, the harmful or flammable gas is leaked. It threatens worker safety.

In addition, in the case of the conventional blower, since compressed air usually leaks from the connection between the rotating part and the fixed fixing part, all of these connections must be sealed. In addition, the conventional blower has a structure in which the rotating shaft itself of the center is rotated relatively has a lot of parts to be relatively sealed and there is a problem that the manufacturing cost increases by increasing the parts for such sealing.

The first object of the present invention is to couple the impeller having a cylindrical space outside the central axis that does not rotate and to combine the impeller with the motor shaft to rotate the motor shaft and the impeller together so that the compressed air leaks between the impeller and the housing It is to provide a turbo blower to prevent the source.

It is a second object of the present invention to provide a turbo blower which is easy to adjust the gap between the rotating impeller and the fixed shroud.

It is a third object of the present invention to provide a turbo blower capable of integrating an air suction scroll and an air discharge scroll to reduce the number of parts and minimize the overall weight.

According to an embodiment of the present invention for achieving the first object 1) a motor; 2) an air suction scroll coupled to the motor to suck air in the motor side of the motor; 3) at least one impeller compresses the air sucked from the air suction scroll, is connected to the motor shaft of the motor, rotates together with the motor shaft, and has a cylindrical storage space formed at the center thereof; 4) a rotating shaft which is inserted into the storage space of the impeller and is fixed while supporting the impeller with a plurality of rolling bearings; 5) an air discharge scroll to discharge the compressed air from the impeller, and coupled to the end of the rotational shaft; 6) at least one shroud coupled between the air suction scroll and the air discharge scroll while surrounding the impeller; It provides a turbo blower comprising a.

The turbo blower is coupled to the rotating motor shaft and the motor shaft and the impeller rotating at the same time is coupled by a coupling and a spline. In more detail, the coupling is coupled to the outer surface of the motor shaft, the spline is coupled to the outer surface of the coupling and the impeller is continuously fixed to the side of the spline. And the outer surface of the coupling and the inner surface of the spline is coupled to the coupling surface is sealed by a sealing means such as a rubber ring, it is possible to fundamentally block the leakage of compressed air to the outside.

Here, in addition to the method in which the impeller itself is directly coupled to the coupling and the spline to rotate, it is also possible to insert a separate hollow shaft integrated with the spline, or combined with the spline to the impeller inner diameter to fix the impeller.

According to one embodiment of the present invention for achieving the second object of the present invention, a plurality of impellers are combined with a spline by means of a stud bolt, and then integrated, and then a shroud fixed with an impeller using a non-rotating shaft inserted into and fixed inside the impeller Provides a turbo blower that can adjust the gap between.

In addition, the embodiment of the present invention provides a turbo blower in which a cylindrical storage space is formed inside the rotating impeller and lubricating oil is inserted into the storage space. In this way, the lubricant is injected into the storage space inside the impeller, thereby providing a turbo blower that can be used permanently without resupplying the lubricant. To this end, an impeller cover and a washer are inserted between the end of the impeller and the stud bolt, and the inner diameter of the washer is made smaller than the inner diameter of the impeller cover, so that the washer serves as a guard to prevent leakage of lubricant.

In addition, the turbo blower according to the exemplary embodiment of the present invention has a contact surface between the fixed part and the rotating part and a contact surface between the fixed part and the fixed part are all sealed by a sealing means.

According to an exemplary embodiment of the present invention for achieving the third object, there is provided a turbo blower in which an air suction scroll and an air discharge scroll are integrally manufactured.

The turbo blower is made of one of the air suction scroll and the air discharge scroll to form an air suction discharge scroll, and the shroud and the impeller are built into the air suction discharge scroll inner surface. In addition, in the turbo blower in which the air intake and exhaust scroll is integrated, an intake pipe for sucking air and a discharge pipe for discharging the compressed air are positioned on the same plane, and a bypass is formed between the intake pipe and the discharge pipe so that surging is possible. The problem can be solved.

The turbo blower according to the present invention has an inner diameter support that serves to support the impeller by rolling bearings on the inner surface of the impeller rotating without the direct rotation shaft, which is the central axis, directly rotating. Since the present invention has such an inner diameter supporting structure, there is a technical effect to fundamentally prevent the compressed air from leaking, and also to make the sealing method simple and reliable.

And the present invention has such an inner diameter support, there is a technical effect that the rotating impeller can rotate while concentric with the motor shaft.

In addition, the present invention has a method of inserting and fixing the non-rotating shaft inside the impeller assembly, there is a technical effect that it is very easy to control the gap between the impeller and the shroud.

In addition, the diameter of the washer fixed to the stud bolt is reduced to have a technical effect of preventing the washer from leaking out the lubricant stored in the lubricant storage space during the operation of the turbo blower.

In addition, the turbo blower according to the present invention by combining the impeller by such a stud bolt, and by forming a cylindrical storage space in the center of the combined impeller, the impeller itself exhibits the technical effect of acting as a rotating body. . In addition, the storage space inside the impeller thus formed is injected and stored with lubricating oil to act as a space for storing lubricating oil during operation of the turbo blower.

The turbo blower according to the present invention facilitates the assembly of the impeller and easily solves the balance control problem of the rotating impeller by combining the motor and the impeller using a spline.

In addition, by allowing the impeller to be assembled in this way, the shroud and the impeller can be manufactured separately, resulting in lower manufacturing costs.

In addition, the turbo blower according to the present invention can reduce the number of parts by providing an embodiment to integrate the air suction scroll and the air discharge scroll, it is possible to minimize the overall weight of the turbo blower due to the integrated air suction discharge scroll There is an advantage.

In addition, the turbo blower according to the present invention has an advantage of easily forming a bypass in the space between the air suction pipe and the discharge pipe by solving the surging problem by integrating the air suction scroll and the air discharge scroll. have.

In addition, the turbo blower according to the present invention has an advantage of increasing the aerodynamic efficiency by installing a plurality of guide wings to form a horizontal expansion passage on the outer side of the cylinder of the shroud.

Hereinafter, embodiments of the turbo blower according to the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to the following embodiments. Therefore, those skilled in the art may implement the present invention in various other forms without departing from the technical spirit of the present invention.

Hereinafter, a turbo blower according to a first embodiment of the present invention will be described in detail.

1 is a front elevational view of a three-stage turbo blower according to a first embodiment of the present invention, in which a portion of a high speed rotor is cut, and FIG. 2 is a rotor of a three-stage turbo blower according to a first embodiment of the present invention. An enlarged cross-sectional view showing a part.

1 and 2, the turbo blower 1 according to the first embodiment of the present invention includes a motor 10, an air suction scroll 20, an air discharge scroll 30, a shroud 40, and an impeller ( 50) and a non-rotating shaft 70.

A flange 11 is formed at the output side of the motor 10, and the air suction scroll 20 is coupled to the flange 11. And the rotational power of the motor 10 is output to the motor shaft 13, the coupling 15 is fixed to the motor shaft 13 by the key (16).

The coupling 15 is formed in a cylindrical shape, the outer surface of one end is formed with an outer gear 17 and a sealing groove 18 for sealing. The rubber ring 19 is inserted into the sealing groove 18.

The coupling 15 coupled to the motor shaft 13 is coupled to the cylindrical spline 12, and the inner gear 14 is formed on the inner surface of the spline so that the inner gear 14 is the outer gear 17 of the coupling. ) Is coupled to transmit the rotational force of the motor shaft 13 to the spline 12 one to one.

The side of the spline 12 has an overall shape of a disk shape and the impeller 50 having a cylindrical hollow portion in the center is coupled by the stud bolt (55). Therefore, the impeller 50 is directly connected to the spline, and the impeller 50 rotates together with the spline by the rotational force transmitted to the spline. The number of stud bolts 55 used herein is determined by the size of the turbo blower 1, and in this embodiment, the three impellers 50 are firmly fixed using six.

And the impeller 50 is determined by the individual number of the impeller fastened according to the compression stage of the turbo blower, in this embodiment illustrates a state in which the three impeller is coupled. The impeller 50 has a plurality of vanes 54 and vane arranged on one circumferential surface of the disc-shaped body to form a flow path for pressurizing the sucked air. In addition, the coupling ring 59 is inserted into the cylindrical inner diameter portion where the impeller 51 and the impeller 52 contact.

And the stud bolt 55 is formed with a screw end that is coupled to the spline (12). In addition, the other end of the stud bolt 55 is fastened to the stud nut 58, the impeller cover 56 and the washer 57 is inserted and fixed between the stud nut 58 and the impeller 53. The washer 57 serves as a barrier to prevent the lubricant stored in the lubricant storage space 71 from flowing out when the turbo blower 1 is operated. Therefore, in the present invention, the inner diameter of the washer 57 is made smaller than the inner diameter of the impeller cover 56 is used.

In the above, the impeller 50 itself has been described with respect to the method of forming a rotating body by combining with the spline 12, in addition to this coupling method is a separate hollow integrated with the spline 12, or combined with the spline 12 It is also possible to insert a shaft (not shown) into the impeller 50 to fix the impeller 50.

When the disk-shaped impeller 50 is coupled by the stud bolt 55 as described above, a cylindrical storage space 71 is formed inside the center of the impeller 50. This storage space 71 serves as a space for storing lubricating oil while the turbo blower 1 is operating.

In addition, the non-rotating shaft 70 is inserted into the internal storage space 71 of the impeller 50 via the rolling bearings 81 and 85.

The rolling bearing coupled to the non-rotating shaft 70 may use a ball bearing 81 or a roller bearing 85. In this embodiment, the roller bearing 85 is coupled to the motor side, and the opposite side is coupled to the ball bearing 81. To illustrate. The rolling bearings 81 and 85 used herein may employ a conventional bearing in which a ball or a roller is inserted between the outer ring and the inner ring, and the coupling method is also conventional, and thus detailed descriptions of the shape and the coupling method will be omitted. . However, the roller bearing 85 coupled in the direction of the motor shaft 13 is combined with two rollers. One is coupled to the inner diameter of the coupling 15 and the other is coupled to the inner diameter of the spline 12. At this time, in the case of the roller bearing 85 coupled to the motor side, the outer ring of the roller bearing 85 is fixed to the inner diameter of the coupling 15 assembled to the outer diameter of the motor shaft 13, the non-rotating shaft 70 The inner ring of the roller bearing 85 is fixed to the outer diameter of the non-rotating shaft 70 through the roller of the roller bearing 85 to be supported while being centered on the coupling 15. Therefore, the non-rotating shaft 70 is spaced apart from the motor shaft 13, but the rotation center is aligned with the motor shaft 13 by this coupling structure.

The non-rotating shaft 70 of the embodiment according to the present invention is not directly connected to the motor shaft 13, but is fixed at a predetermined distance apart as shown in FIG. Therefore, the non-rotating shaft 70 of the present embodiment cannot receive the rotational force of the motor shaft 13 and is fixed without being rotated while the turbo blower 1 is being driven. In addition, since the non-rotating shaft 70 in the structure of the turbo blower according to the present embodiment serves to support the impeller 50 on the inner surface of the rotating impeller 50, an embodiment of the present invention can be named a turbo blower that is supported by the inner diameter. have.

On the other hand, the opposite end of the motor of the non-rotating shaft 70 is coupled to the shaft cover 90 by the shaft nut (75). The non-rotating shaft 70 is a screw is formed in one portion that is coupled to the shaft cover 90, the screw is formed in the next portion where the screw is formed so that the non-rotating shaft is sliding in the shaft cover 90 Not. Therefore, the non-rotating shaft 70 itself can be precisely moved in the axial direction by using the screw formed on the non-rotating shaft 70 and the portion where the screw is not formed. As such, when the non-rotating shaft 70 is moved in the axial direction, the gap between the impeller 50 and the shroud 40 is precisely adjusted. The method of adjusting the gap between the impeller 50 and the shroud 40 using the non-rotating shaft 70 will be described in detail as follows. That is, in the embodiment of the present invention, the rotating body rotating together with the impeller 50 becomes an assembly consisting of a spline 12, an impeller 50, a ball bearing outer ring 81, and an impeller cover 56. Since these rotating bodies depend on the ball of the ball bearing 81, a ball bearing outer ring is located in the ball center. On the other hand, the parts fixed to the non-rotating shaft 70 does not rotate is an assembly consisting of the non-rotating shaft 70 and the ball bearing inner ring 81 of the inner ring (81). Since these assemblies support the load of the rotating assembly using the balls of the ball bearing 81, the ball center is positioned at the center of the ball bearing inner ring. Accordingly, when the non-rotating shaft 70 is moved in the axial direction, the rotating assembly supported by the load of the ball bearing is also moved in the axial direction, so that the gap between the impeller 50 and the shroud 40 can be adjusted. At this time, the shaft nut 75 serves as a lock nut for fixing the precisely adjusted gap.

And the air exhaust scroll 30 is firmly fixed to the shaft cover 90 by a plurality of discharge nuts (31). Here, the contact surface of the non-rotating shaft 70 and the shaft cover 90 and the contact surface of the shaft cover 90 and the air discharge scroll 30 are completely sealed by a sealing means. Therefore, the contact surface between the rotating body (impeller) and the fixed body (the non-rotating shaft and the air outlet) is completely blocked from the inflow and outflow of air. Herein, the term "sealing means" refers to materials and components that restrict the entry and exit of air, both liquids and solids. Examples include liquid silicone gels, and solids such as rubber rings, rubber pads or gaskets. The sealing means to be described later is used in the same sense.

In addition, the shroud 40 fastened between the air suction scroll 20 and the air discharge scroll 30 has a contact surface to which they are fastened as a sealing means, so that the rotating body (impeller) and the fixed body (air suction scroll, air discharge) Completely block the air inflow between the scroll and shroud).

Here, the shroud 40 is coupled to the outer stud bolt 23 by using the outer flange formed on the air suction scroll 20 and the air discharge scroll 30, respectively. The number of external stud bolts 23 used to fasten the shroud 40 is used as many as can ensure a sufficient sealing between the shroud (40).

And the shape of the air suction scroll 20 and the air discharge scroll 30 is formed with a passage through which air flows, respectively, and the passage of the air flow is the same as that of a blower that is commonly used, so a detailed description thereof will be given. Omit. In addition, the shape of the shroud 40 is roughly formed in a double disk shape and a passage through which air flows is formed inside the double disk shape, and the direction of the air flow flows from the outside to the inside.

Here, the reason why the spline 12 is adopted as a coupling structure for connecting the motor shaft 13 and the rotating body (impeller) in the motor blower according to the embodiment of the present invention will be described.

In general, in the case of a high-speed rotating body, if the balance of the rotating body is exactly matched, the rotating body does not vibrate, thereby eliminating noise and increasing the compression efficiency of air. The balance problem of the rotating body can be solved by directly coupling the motor and the rotating body integrally. However, when directly coupling the motor and the rotating body in this way, it becomes very difficult to assemble each part. In addition, although the motor and the rotating body may be directly coupled by the shrink fit method, the shrinking of the entire rotating rotating body has technical problems.

Therefore, when combining the motor and the rotating body (impeller) using the spline as in the embodiment of the present invention, it is possible to solve the problem of assembly of the rotating body (impeller) and the balance of the rotating body (impeller) at the same time. In addition, the spline has the advantage of being able to efficiently transmit power with only a few gears or grooves, and at the same time, it is a component that requires a high degree of precision, thereby significantly reducing manufacturing costs.

Hereinafter, a method of operating the turbo blower 1 and a flow of compressed air according to the above-described embodiment will be described.

First, when the motor 10 is operated, the rotational force output from the motor is transmitted to the impeller 50 by the coupling 15 and the spline 12 directly connected to the motor shaft 13. At this time, the three impeller 50 is fixed integrally by the stud bolt 55 is rotated together. And while the impeller 50 rotates, the non-rotating shaft 70 which supports the impeller 50 by the rolling bearings 81 and 85 is fixed without rotation.

As described above, when the motor 10 is operated, external air flows in through the air suction scroll 20 and proceeds in the direction of the arrow of FIG. 1. The air introduced into the air suction scroll 20 flows into the center of the first impeller 51 and is compressed while rotating along a wing formed in a bent manner on one side of the impeller 51 to be outside the first impeller 51. To the side. The first compressed air discharged to the outside of the first impeller 51 is introduced into the outer inlet of the first shroud 43 and then introduced into the center of the second impeller 52 through the inner outlet. Compressed air introduced in this way is compressed once more each time passing through the subsequent impeller (52, 53) and then flows into the air discharge scroll 30 to the outside along the inner passage of the air discharge scroll (30) Compressed air is discharged.

Here, the reason why the compressed air does not leak to the outside while the air is compressed in the turbo blower according to the embodiment of the present invention will be described. One of the reasons that the compressed air does not leak to the outside in the embodiment of the present invention is because the air suction scroll 20 is installed to the motor 10 side, another reason is to configure a rotating body (impeller) having an inner diameter support Because.

First, the reason according to the position of the air suction scroll 20 will be described. If the position of the air suction scroll 20 is installed on the opposite side of the motor 10 (the position of the air discharge scroll 30 in FIG. 1), the air discharge scroll 30 should be installed on the rotating motor shaft 13. something to do. However, since the part where the rotating motor shaft 13 and the air discharge scroll 30 are coupled is a position where the rotating part and the fixed part are in contact, it becomes very difficult to seal this part. Furthermore, if the air discharge scroll 30 is installed on the rotating motor shaft 13, the motor shaft 13 and the air discharge scroll are passed due to the increased pressure of the air having a higher pressure while passing through the multi-stage impeller 50. The possibility of being discharged to the outside through the portion where 30 is coupled becomes very high.

However, when the air suction scroll 20 is installed on the motor shaft 13 as in the embodiment of the present invention, the air flowing into the air suction scroll 20 for the first time is not compressed, and the motor shaft 13 rotates. There is no need to fundamentally consider the problem of air leakage through the position where the fixed air suction scroll 20 is coupled.

Next, explain the reason for the inner diameter support. As described above, in the exemplary embodiment of the present invention, the shroud 40 fastened between the air suction scroll 20 and the air discharge scroll 30 has all the contact surfaces to which these parts are fastened so that the rotating body (impeller) and Air inflow and out between the fixtures (air intake scroll, air exhaust scroll, shroud) is completely enclosed. Therefore, hereinafter, looks at the problem of air leakage through the contact surface between the rotating impeller 50 and the fixed rotating shaft 70 and the rolling bearings 81 and 85 supporting them.

Compressed air gradually increasing in pressure while passing through the third stage impeller 50 will pass through the third impeller 53 and be discharged to the air discharge scroll 30. However, a portion of the compressed air, as indicated by the arrows in FIG. 2, has a shaft cover 90 and an impeller cover 56 along the gap formed between the side walls of the third impeller 53 and the air discharge scroll 30. After passing through the space formed between the through ball bearing 81 will be introduced into the inner space (71).

However, as described above, the contact surface of the non-rotating shaft 70 and the shaft cover 90 and the contact surface of the shaft cover 90 and the air discharge scroll 30 are completely sealed, so that compressed air is directed toward the shaft cover 90. It cannot be leaked. Then, the possibility that the compressed air introduced into the inner space 71 leaks in the direction of the motor shaft 13 will be described. However, the rubber ring 19 is coupled between the coupling 15 and the spline 12, and the motor shaft 13, the coupling 15, the spline 12, and the impellers 51, 52, and 53 are integrally formed. Since the compressed air introduced into the inner space 71 is leaked in the direction of the motor shaft 13, there is no possibility of rotating.

Therefore, in the case of a turbo blower having an inner diameter supporting structure as in the embodiment of the present invention, the internal space 71 of the impellers 51, 52, and 53 is completely sealed so that the compressed air does not leak to the outside.

Next, the assembly of the turbo blower according to the first embodiment of the present invention will be described.

First, the air suction scroll 20 is assembled to the flange 11 of the motor 10. Then, the coupling 15 is fixed to the motor shaft 13 using the key 16 and the spline 12 is coupled to the outside of the coupling 15.

Next, the impeller 50 and the shroud 52 are sequentially coupled using the stud bolt 55, and then the non-rotating shaft 70 and the rolling bearings 81 and 85 are coupled to the internal space 71 of the impeller 50. Make one intermediate assembly.

This intermediate assembly is fastened to the spline 12 using a stud bolt 55.

Then, the air exhaust scroll 30 is coupled to the outer surface of the intermediate assembly, and the external stud bolts 23 are fastened to the outer flange portions formed in the air suction scroll 20 and the air exhaust scroll 30, respectively.

Then, the shaft cover 90 is inserted into the non-rotating shaft 70 and the shaft cover 90 is fixed to the air discharge scroll 30 using the discharge nut 31.

The gap between the blade of the impeller 50 and the fixed shroud 40 rotating in the assembled state is precisely adjusted using the non-rotating shaft 70. This method of adjusting the spacing is made by setting the size of the screw thread formed on the non-rotating shaft 70 in advance, and then can be precisely controlled by adjusting the rotation angle of the non-rotating shaft 70.

Then, the shaft nut 75 is fastened to the end of the non-rotating shaft 70 to complete the assembly of the turbo blower 1.

Next will be described a lubricant supply method of the turbo blower according to an embodiment of the present invention.

Turbo blower according to an embodiment of the present invention can be used continuously without recharging by supplying a single lubricating oil because the method of embedding the lubricating oil in the storage space 71 in advance.

As the lubricant used, a highly viscous lubricant such as grease oil can be used.

If the turbo blower 1 is operated while grease oil is injected into the storage space 71, the impeller 50 rotates at a high speed. The grease oil is supplied to the rolling bearings 81 and 85 and the remaining grease oil is in close contact with the inner wall of the inner space 71 by centrifugal force. In such a state, the grease oil in close contact with the inner wall of the inner space 71 no longer leaks to the outside by the washer 57. (Since the inner diameter of the washer 57 is smaller than the inner diameter of the impeller cover 56, it functions as a lubricant leakage preventing jaw.)

And suppose that the turbo blower 1 is to stop the rotation. If it stops momentarily, there is a possibility that the lubricant may leak out due to the pressure difference. However, the high-speed rotor will stop slowly due to inertia to rotate, even if the power supply is turned off. Centrifugal force and air compression force will be inversely proportional, so no leakage of lubricant due to the stop of rotation will occur. will be.

In addition, since the storage space 71 is completely sealed as described above, it can be seen that there is almost no flow of air in the storage space. Therefore, since the grease oil stored in the storage space 71 may be regarded as not substantially subjected to a change in temperature, the problem of deterioration of the grease oil is negligible and can be ignored.

Therefore, the turbo blower according to an embodiment of the present invention can use the lubricant semi-permanently.

Hereinafter, a turbo blower according to a second embodiment of the present invention will be described.

When comparing the second embodiment of the present invention with the first embodiment, the same point is that the air suction scroll is provided in the motor side direction, and that the rotating body supports the inner diameter. In addition, the difference between the two embodiments is that the air suction scroll and the air discharge scroll are integrally manufactured as one body instead of separately manufactured. As described above, since the second embodiment integrally manufactures the air suction scroll and the air discharge scroll, a part of the parts necessary to secure the assemblability are manufactured differently from the first embodiment.

In the second embodiment of the present invention, the number of parts can be reduced by integrating the air suction scroll and the air discharge scroll, thereby minimizing the overall weight of the turbo blower. In addition, in this embodiment, by integrating the air suction scroll and the air discharge scroll, there is an advantage that a bypass (by pass) that can solve a surging problem can be easily formed in the space between the air inlet and the outlet.

Hereinafter, a turbo blower according to a second embodiment of the present invention will be described in more detail.

3 is a front elevational view of a two-stage turbo blower according to a second exemplary embodiment of the present invention, and a part of the high-speed rotating body is partially cut, and FIG. 5 is a perspective view showing a partial cross-sectional view of a two-stage turbo blower according to a second embodiment.

The second embodiment of the present invention is also substantially the same as the basic structure of the first embodiment because it supports the inner diameter and the air suction scroll is installed in the motor direction. Therefore, in the description of the second embodiment, detailed descriptions of the same parts as in the first embodiment will be omitted, and the description will be mainly focused on different points.

The turbo blower 100 of the second embodiment includes a motor 110, an air suction exhaust scroll 120, a shroud 140, an impeller 151, 152, and a non-rotating shaft 170.

In the second embodiment, the power output from the motor 110 is transmitted to the impellers 151 and 152 through the motor shaft 113, the coupling 115, and the spline 112 so that they rotate integrally. As described above, the non-rotating shaft 170 supporting the impellers 151 and 152 by the rolling bearings 181 and 185 is fixed without rotating while the rotating body (motor shaft, coupling, spline and impeller) rotates. As described above, the rotating body and the fixed body of the second embodiment are the same as the first embodiment, and their coupling structure is also the same as the first embodiment.

In the second embodiment, the air intake and exhaust scroll 120 is integrally manufactured such that the intake pipe 121 for sucking air and the discharge pipe 123 for discharging the compressed air are positioned on the same plane. In addition, a bypass 125 is formed between the intake pipe 121 and the discharge pipe 123 of the air intake and exhaust scroll 120. The bypass 125 serves to solve the surging problem by re-suctioning the pressurized air discharged into the discharge pipe 125 to the intake pipe 121.

And the direction opposite to the motor 110 of the air intake exhaust scroll 121 is large enough to open the shroud 140, the shaft cover 190 is fastened to this open portion.

On the other hand, the shroud 140 in the second embodiment is provided with a plurality of guide vanes 149 which form a horizontal diffuser on the outer side of the cylinder. The guide blade 149 of the shroud serves to guide the first compressed air compressed in the impeller 151 in the rotational direction of the impeller 152 in advance to reduce the inflow loss to the next compression stage. . And the shroud 140 is inserted and fixed between the impeller (151, 152) in the case of a multi-stage and inserted into the rear of the impeller (151) in the case of a single stage.

Next, the assembly of the turbo blower according to the second embodiment of the present invention will be described.

First, the air intake exhaust scroll 120 is assembled to the flange 111 of the motor 110. Then, the coupling 115 is fixed to the motor shaft 113 using the key 116 and the spline 112 is coupled to the outside of the coupling 115.

Next, insert the intermediate assembly in which the non-rotating shaft 170 and the rolling bearing 185 are coupled to the internal storage space 171 of the impeller 151 for the first stage compression into the open portion of the air intake exhaust scroll 120. do.

Then, the shroud 140 is inserted into the outside of the impeller 151, and then the shroud 140 is fastened by using a plurality of bolts 149 on one side of the air intake and exhaust scroll 120. At this time, the contact surface of the shroud 140 and the air suction exhaust scroll 120 is all closed by a sealing means.

Then, the impeller 152 for two-stage compression outside the shroud 140 is inserted into the non-rotating shaft 170 together with the ball bearing 181. Then, the impellers 151 and 152 and the spline 112 are fastened by using the stud bolt 155. At this time, a washer 157 and an impeller cover 156 are inserted into and fastened between the stud bolt 155 and the impeller 152.

Next, the impellers 151 and 152 are fixed using the stud nut 158.

Then, the shaft cover 190 is put on the outside of the non-rotating shaft 170, and the shaft cover 190 is fastened using a plurality of bolts 131 to the open side of the air intake and exhaust scroll 120. At this time, the contact surface of the shaft cover 190 and the air suction exhaust scroll 120 and the contact surface of the non-rotating shaft 170 and the shaft cover 190 are all sealed by a sealing means.

The gap between the blades of the impellers 151 and 152 rotating in the assembled state and the fixed shroud 140 is precisely adjusted using the non-rotating shaft 170. After the adjustment is completed as described above, the shaft nut 175 is fastened to the end of the non-rotating shaft 170.

The turbo blower 100 according to the second embodiment of the present invention as described above is substantially the same as the operation method, the flow of compressed air and the lubricating oil supply of the first embodiment described above, so a detailed description thereof will be omitted. .

Although the turbo blower has been described with reference to the preferred embodiments of the present invention as described above, those skilled in the art will appreciate that the present invention is within the scope without departing from the spirit and scope of the invention as set forth in the claims below. It will be understood that various modifications and changes can be made.

1 is a front elevational view showing a three-stage turbo blower according to a first embodiment of the present invention, with a part of a high speed rotating body cut away.

2 is an enlarged cross-sectional view illustrating a rotor part of the three-stage turbo blower according to the first exemplary embodiment of the present invention.

3 is a front elevational view of a two-stage turbo blower according to a second exemplary embodiment of the present invention, with a part of the high-speed rotating body cut away.

4 is an enlarged cross-sectional view illustrating a rotor part of a two-stage turbo blower according to a second exemplary embodiment of the present invention.

5 is a perspective view showing a partial cross-sectional view of a two-stage turbo blower according to a second embodiment.

Claims (14)

motor; An air suction scroll coupled to the motor such that air is sucked in the motor side of the motor; At least one impeller compressing the air sucked from the air suction scroll, connected to the motor shaft of the motor, rotating together with the motor shaft, and having a cylindrical storage space formed at a center thereof; A rotating shaft which is inserted into a storage space of the impeller and is fixed while supporting the impeller with a plurality of rolling bearings; An air discharge scroll which discharges compressed air from the impeller and is coupled to the end of the non-rotating shaft; And At least one shroud coupled between the air suction scroll and the air discharge scroll while surrounding the impeller; Turbo blower that includes. The turbo blower of claim 1, wherein a coupling is coupled to an outer surface of the motor shaft, a spline is coupled to an outer surface of the coupling, and the spline and the impeller are side coupled. According to claim 2, The rolling bearing is fixed to the non-rotating shaft is a roller bearing on the motor side and a ball bearing on the opposite side, the outer ring is fixed to the inner diameter of the coupling, the roller bearing, Turbo blower whose inner ring is fixed to outer diameter. 4. The turbo blower of claim 3 wherein the spline and the impeller are coupled by a plurality of stud bolts. The turbo blower of claim 1, wherein the motor shaft and the impeller are coupled by a hollow fiber shaft integral with the spline or formed separately from the spline. 5. The turbo blower of claim 4, wherein a gap between the impeller and the shroud is controlled by the non-rotating shaft. The turbo blower of claim 6, wherein lubricating oil is inserted into the storage space of the impeller. 8. The turbo blower of claim 7, wherein an impeller cover and a washer are inserted between the impeller and the end of the stud bolt and the inner diameter of the washer is smaller than the inner diameter of the impeller cover. The turbo blower of claim 8, wherein a mating surface between the outer surface of the coupling and the inner surface of the spline is sealed by a sealing means. 10. The non-rotating shaft and the shaft of the non-rotating shaft in the opposite end of the motor cover is coupled, the shaft cover is coupled to the air exhaust scroll, the non-rotating shaft and the shaft And a contact surface of the cover, the contact surface of the shaft cover and the air discharge scroll, the contact surface of the air discharge scroll and the shroud, and the contact surface of the shroud and the air suction scroll are all sealed by a sealing means. 10. The method according to any one of claims 1 to 9, wherein the air suction scroll and the air discharge scroll are integrally formed to form an air suction discharge scroll, and the shroud is formed on the inner surface of the air suction discharge scroll. Turbo blower located between or in the rear. 12. The air intake exhaust scroll of claim 11, wherein an intake pipe for sucking air and a discharge pipe for discharging compressed air are positioned on the same plane, and a bypass is formed between the intake pipe and the discharge pipe of the air intake exhaust scroll. Turbo blower. 13. The turbo blower of claim 12, wherein the shroud is provided with a plurality of guide vanes that form a horizontal enlarged flow path on an outer side of the cylinder. According to claim 12 or 13, wherein the end of the non-rotating shaft in the opposite direction of the motor is coupled to the shaft cover, the shaft cover is coupled to the air suction exhaust scroll, the contact surface of the non-rotating shaft and the shaft cover, And a contact surface of the shaft cover and the air intake exhaust scroll and a contact surface of the air intake exhaust scroll and the shroud are hermetically sealed by a sealing means.

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