Device for balancing of high-speed rotor of a turbomachine

 

The device is designed for high-speed turbomachines (turbopump assemblies rocket engines, turbochargers, aircraft gas turbine engines). The device consists of a body and a lid, which is made of the internal reference cylindrical surface and the inner support ends. On the outer side in the housing and the cover is cylindrical mounting elements. The housing and the cover are connected by a connecting planes passing through the axis of the internal reference cylindrical surfaces. Balancing the rotor in its bearings mounted on the supporting cylindrical surfaces between the inner support ends. Between the inner bearing end face and the end face of the bearing has an elastic axial element. The housing and the cover are installed in the outer casing comprising a lower and an upper part that is connected on the mating surfaces. In an external enclosure coaxial cylindrical mounting body and the cover are external cylindrical mounting elements. In the housing, the cover and the outer casing is made channels for supplying and discharging lubricant. In an external enclosure installed sensors deflection of the rotor. Low-frequency balancing Roto is isolobodon rotors by eliminating axial and radial clearances in the bearings, secure attachment of the rotor and to improve the lubrication of its bearings in the high-frequency balancing. 4 C.p. f-crystals, 2 Il.

The invention relates to mechanical engineering and can be used in high-speed turbomachines (turbopump units rocket engines, turbochargers, aircraft gas turbine engines).

High technical characteristics of modern turbomachines can be achieved at high frequencies of rotation of the rotors. Vibrations caused by the operation of high-speed machines, create additional loads on structures, reducing the service life of the machines. In addition, vibrations have an adverse effect on the human body. One of the causes vibration of the turbomachine is the unbalance of the rotor. To reduce the unbalance of rotors produce their balance by correcting the mass. Ensuring a minimum degree of unbalance of rotors is an important task in all phases of technology development.

The rotors may be subjected to low-frequency or high-frequency balancing. Low-frequency balancing is performed when the rotational speed of the rotor is substantially lower operating speed and applies DL the s spins. High-speed balancing is performed over the entire range of operating frequencies of the rotor and is used for high-speed flexible rotors, the working speed which is greater than the first critical speed. In relation to the turbopump units LRE high-speed balancing is used for rotors operating at speeds over 30,000 rpm In the high-frequency balancing the rotor is installed in the device (the device), which is fixed in the supports of the balancing machine (stand). The residual unbalance of the rotor when the balancing is largely determined by the applied device for balancing.

A device for balancing a rotor, comprising a housing and support. Supports mounted on the connecting plane of the housing. The body is made of the internal reference of the cylindrical and end surfaces on which you will install your ball balancing the rotor. The rotor is mounted in the housing supports. On the casing is placed a cylindrical mounting elements, which he relies in support of the balancing machine. The installation elements are perpendicular to the axis of the cylindrical support surfaces (Leviticus M device has the following disadvantages.

Balancing the rotor can make a precessional movement within the radial clearance and axial vibrations within the axial clearance in the bearings. In the precessional motion of the rotor has an imbalance equal to the product of the mass of the rotor on the value of radial clearance in the bearings. Axial vibrations of the rotor increases the residual imbalance. These imbalances cannot be eliminated by correction of the rotor. During operation of the turbomachine unresolved imbalance creates dynamic loads on the rotor and its bearings, which increases vibroactivity and reduces the durability of the machine.

In the process of high-frequency balancing before adjusting his weight on the ball of the rotor can influence significant dynamic radial load imbalance. These loads are transmitted to the housing, the bearings and cylindrical mounting elements of the device. In the specified device is not reliable fastening of the rotor under the action of dynamic radial load imbalance. Not also ensures secure mounting and the device on the balancing machine. As a result of this high speed, the rotor cannot be ambulanceroid within the working range of custservice can only be achieved when the liquid lubricant. The known device does not contain structural elements that provide the liquid lubricant ball bearings, which limits the rotational speed of the rotor when it is balanced.

The device no sensor deflections of the rotor, which prevents in the process of high-frequency balancing to minimize deflections of the rotor.

The task of the invention is to remedy these disadvantages and improve the quality of balancing of high-speed rotors by eliminating axial and radial clearances in the bearings, and secure attachment of the rotor and improve lubrication of its bearings in the high-frequency balancing.

The problem is solved in that the device for balancing of high-speed rotor of a turbomachine, comprising a housing with an inner cylindrical support surfaces and ends, a connecting plane which has a support, and a cylindrical mounting elements according to the invention supports are made in the form of a cover, forming together with the case of General internal reference cylindrical surface and end faces, and a cylindrical mounting elements are made in the housing and the cover in alignment with their internal reference cylindrical-poverhnostnym anchor end and the ball bearing one of the pillars of the rotor elastic axial element.

To ensure the mounting of the rotor on the balancing stand with his high-frequency balancing the body and the cover placed in the outer casing, in which the coaxial cylindrical mounting body and the cover are external cylindrical mounting elements.

To ensure reliable lubrication of roller bearings, balancing rotor in the housing, the cover and the outer casing is made channels for supplying and discharging the lubrication of roller bearings.

In an external enclosure perpendicular to the axis of the outer cylindrical mounting elements installed sensors deflection of the rotor.

In Fig.1 shows a device without external enclosure, and Fig.2 device with an outer housing, where 1 - body; 2 - cover; 3, 4 - internal reference cylindrical surface; 5, 6 - internal reference end; 7, 8 - cylindrical mounting element; 9, 19 - connecting plane; 10 - balancing the rotor; 11, 12 - ball; 13 - elastic axial element;
14 - support ring;
15 - disc springs;
16 - the outer casing;
17 - the lower part of the outer case;
18 - top of the outer casing;
20, 21 to the outer cylindrical mounting element;
22, 23 feeds a supply of lubricant;
24, 25 - channel drain grease;
26, the cover 2, which made the internal reference cylindrical surface 3, 4 and the internal reference end faces 5, 6. On the outer side in the housing 1 and the cover 2 is made of a cylindrical mounting elements 7, 8. The housing 1 and cover 2 are connected on the mating surfaces 9, passing through the axis of the inner cylindrical support surfaces 3, 4. Balancing the rotor 10 with its ball bearings 11, 12 is mounted on the cylindrical support surfaces 3, 4 between the internal reference end faces 5, 6. Between the internal reference end face 6 and the end face of the bearing 12 has an elastic axial element 13 consisting of a support ring 14 and the Belleville springs 15.

The housing 1 and the cover 2 is installed in the outer casing 16 (Fig.2) including the bottom 17 and top 18 of its parts, interconnected by connecting planes 19. In an external enclosure 16 coaxial cylindrical mounting body 1 and the cover 2 has an external cylindrical mounting elements 20, 21.

In case 1, the cover 2 and the outer casing 16 provided with channels for supplying lubricant 22, 23. In the housing 1 and the lower part 17 of the outer case is made channels draining the lubricant 24, 25. On both sides of each bearing is made gap-type seals 26, 27, 28, 29. Balancedue exnem housing 16 is installed sensors trough 31, 32 of the rotor.

Low-frequency balance is produced without external housing 16 (Fig.1). Balancing the rotor is installed in the housing 1 and secured therein by a cover 2. The housing 1 together with the cover 2 and a balancing rotor mounted on a balancing machine for cylindrical mounting elements 7, 8.

When high-frequency balancing the outer casing 16 (Fig.2) together with the housing 1, a cover 2 and a balancing rotor mounted on a balancing machine for external cylindrical mounting elements 20, 21.

In the process of balancing the force of the Belleville springs 15 is betrayed to the bearing 12 through the support ring 14, resulting in a balancing of the rotor 10 is shifted in the axial direction up to the stop in the inner abutment end face 5 and the two ball bearings 11, 12 have the same axial force equal to the force of the Belleville springs 15 elastic thrust element 13. Under the influence of this force in the bearings 11, 12 is fixed axis, and hence the radial clearance. Due to this, when balancing the possibility of precession of the rotor within the radial clearance existing in a ball in the free state in an assembled for balancing the rotor before installing the of vibration of the rotor.

For "hard" rotors low-frequency balancing is the final operation prior to Assembly, for example, are measured. The absence of precession of the rotor provides the minimal residual imbalance at low frequency balancing and reduces the dynamic loads acting on the bearings during operation of the turbomachine.

For flexible rotors preliminary low-frequency balancing is a preparatory operation before balancing. Preliminary low-frequency balancing provides lower initial loads on the bearings to a level safe for the health of the rotor and systems balancing stand in the high-frequency balancing of the rotor to the correction of its mass. The application of a composite outer housing 16 consisting of a bottom 17 and a top 18 parts, allows high-frequency balancing without disassembly and reassembly of the rotor after the preliminary low frequency its balancing. The absence of precession of the rotor provides a minimum load on the bearings, and the minimal deflections after high-frequency balancing, which improves the working conditions of the rotor structure of the turbomachine and increases its debt is key to its bearings, and its minimum deflections. The deflections of the rotor during high-frequency balancing is controlled by the deflection sensors 31, 32.

To ensure reliable long-term operation of the rotor in the high-frequency balancing the ball is fed to the lubrication channels for supplying lubricant 22, 23. After the ball bearings grease drained through the drain grease 24, 25. Gap-type seals 26, 27, 28, 29 limit the leakage of lubricant from the cavity of ball bearings.

The proposed device for the balancing of high-speed rotor of the turbomachine has the following advantages.

1. Excluded precession and its associated rotor imbalance, both at low and at high frequency the balance, which improves the working conditions of the rotor structure of the turbomachine and increases its durability.

2. After a preliminary low-frequency balancing the rotor without disassembly and re-Assembly is subjected to high-frequency balancing. This provides low initial dynamic loads during high-frequency balancing to correct its mass. This provides high quality and low complexity high-frequency balancing.

The practical use of the proposed able="text-align:center; margin-top:2mm;">
Claims

1. Device for balancing of high-speed rotor of a turbomachine, comprising a housing with an inner cylindrical support surfaces and ends, a connecting plane which has a support, and a cylindrical mounting elements, characterized in that the support is made in the form of a cover, forming together with the case of General internal reference cylindrical surface and end faces, and a cylindrical mounting elements are made in the housing and the cover in alignment with their internal reference cylindrical surfaces.

2. Device for balancing of high-speed rotor of the turbomachine under item 1, characterized in that between the inner abutment end and the ball bearing one of the pillars of the rotor elastic axial element.

3. Device for balancing of high-speed rotor of the turbomachine under item 1, characterized in that the housing and the cover are placed in the outer casing, in which a coaxial cylindrical mounting body and the cover are external cylindrical mounting elements.

4. Device for balancing the rotor high-speed are measured in points. 1 and 3, characterized in that the housing cover and the outer housing wyprawki rotor high-speed are measured in points. 1 and 3, characterized in that in an external enclosure perpendicular to the axis of the outer cylindrical mounting elements installed sensors deflection of the rotor.

 

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