UA123551U - PRESSURE RELEASE SYSTEM IN THE BEARING UNIT OF THE AXLE TURBO - Google Patents

Abstract

The pressure relief system in the axial turbine machine rotor bearing assembly has at least one pressure relief device (7) mounted on top of at least one bearing assembly (1) and coupled to its inner cavity, with no possibility of unloading this blade (8a) of the impeller (8) of the turbomachine placed between the fairing (3) and the shell of the diffuser (4), withdrawn into the air duct (5) formed between the wall of the housing of the turbomachine (6) and the walls of the fairing (3) with the shell d the infuser (4), in the cavity of which is housed another housing bearing assembly (2), and the housing bearing units (1 and 2) of the shaft are made with oil baths (2A and 1A). Oil baths (2a and 1a) of bearing housing housings (1 and 2) in the fairing cavity (3) and in the cavity of the diffuser shell (4) are connected to the drain pipelines (1b and 2b), which are hydraulically connected to the bath oil station ( 12) and connected to the gas pipeline (11), the channel of which is connected through a pressure relief device (7) in the cavity of the fairing (3) to the cavity of the housing of one bearing unit (1), and in the cavity of the shell of the diffuser (4), through the connecting pipe (11a), with the cavity of the housing of the other bearing assembly (2). The fairing cavity (3) is connected through an additional breather (13) installed therein. with the pipeline (14), with the air cavity of the oil station bath (12).

Description

The useful model belongs to mining engineering, namely to mine fan installations of the main ventilation, and can be used to equalize the pressure and stabilize the temperature regime of the bearing assemblies of the axial turbomachine.

As the closest analogue, the pressure relief system in the bearing unit of the rotor of the axial turbomachine was chosen, which contains an expansion chamber with inlet and outlet channels, connected by an inlet channel to the cavity of the housing of the bearing unit, installed inside the fairing of the turbomachine, and made with the possibility of heat removal from the cavity of the housing of the bearing unit in output channel. An ejector installed in the turbomachine outside its fairing is introduced into the system, while the expansion chamber is connected to the ejector cavity through the outlet channel and is installed between it and the bearing unit.

The disadvantages of the above system include the fact that the ejector effect of the pressure relief device extends only to one front bearing support located on the side of the fairing, which does not provide sufficient tightness, the second - the bearing support on the side of the diffuser, and the use of the pressure relief device is also on the second housing of the bearing assembly does not allow to distribute the pressure effectively at the same time so as to remove the load from the two housings of the bearing assemblies and reduce the leakage of oil to the outside due to their sealing.

The basis of a useful model is the following task:

To ensure the balance of pressure in both bearing assemblies of the rotor of the turbomachine with the pressure inside the fairing.

As a result of solving this problem, a technical result can be obtained, which consists in the elimination of lubricant leaks in the operating mode of the turbo machine from the housings of the bearing units due to the balance of pressure in their housings, with negative pressure inside the fairing.

Achieving the declared technical result provides the useful model with consumer properties: reducing the consumption of lubricant and reducing the wear of the bearing units of the turbo machine.

The claimed technical result is achieved due to the fact that in the system of pressure relief in the housing of the bearing assembly of the rotor of the axial turbomachine, which contains at least one pressure relief device (7), fixed from above on at least one housing

From the bearing unit (1) and connected to its inner cavity, with the possibility of unloading excess oil vapor pressure in it, while the blades (va) of the impeller (8) of the turbo machine, placed between the fairing (3) and the diffuser cover (4), are removed in the air channel (5) created between the wall of the turbo machine housing (6) and the walls of the fairing (3) with the diffuser cover (4), in the cavity of which another housing of the bearing assembly (2) is placed, and the housings of the bearing assemblies (1 and 2) of the shaft are made with oil baths (2а and Та), according to the useful model, oil baths (2а and Та) of the housings of the bearing units (1 and 2) in the cavity of the fairing (3) and in the cavity of the diffuser sleeve (4), connect to the drain pipelines ( 16 and 25), which are hydraulically connected to the bath of the oil station (12) and connected to the air pipeline (11), the channel of which is connected through the pressure relief device (7) in the cavity of the fairing (3) to the cavity of the housing of one bearing node (1), and in the cavity of the common thread is a diffuso ra (4), through the connecting pipe (1124), with the cavity of the housing of another bearing assembly (2), while the cavity of the fairing (3) should be connected, through the additional breather (13) installed in it, with the pipeline (14), with air cavity of the bath oil station (12).

The features listed above, different from the prototype, are necessary and sufficient in all cases covered by the scope of legal protection of the utility model.

In addition, it is proposed: - to hydraulically connect the drain pipelines (16 and 25) with the oil station bath (12) through the drain line (10) immersed in it. - install a drain filter (15) and an oil cooler (16) on the drain line (10) in front of the oil station bath (12). - install the oil cooler (16) on the main line (10) at the ratio Ne", where H is the distance between the oil cooler (16) and the oil level in the oil station bath (12), and n! - proportional to the pressure drop in the mine, the height of the liquid column in the drain line (10) immersed in the oil station bath (12).

The technical solution is explained by an example, the implementation of which is not the only possible one, but clearly demonstrates the possibility of achieving the technical result proposed by the new set of essential features.

The essence of the useful model is explained in the drawing, which shows the longitudinal section of the axial turbomachine and is conventionally marked: because 1 - the housing of the bearing unit;

1a - oil bath; 1r - drainage pipeline; 2 - housing of the bearing unit; 2a - oil bath; 2r - drainage pipeline;

C - fairing; 4 - common diffuser; 5 - air channel; 6 - turbo machine body; 7 - pressure relief device; 8 - the working wheel of the turbo machine; va - blades; 9 - shaft; 10 - drain main; 1ba - pipe; 11 - air pipeline; 11a - connecting pipe; 12 - oil station bath; 12a - oil mirror level; 13 - additional breather; 14 - pipeline; 15 - drain filter; 16 - oil cooler.

The system of pressure relief in the housings of bearing assemblies of the rotor of an axial turbomachine is shown on the example of a mine axial turbomachine.

In the presented system, an air channel (5) is formed between the wall of the turbo machine body (b) and the walls of the fairing (3) (coke) and the diffuser cover (4). The blades (va) of the impeller of the turbo machine (8), which is fixed on the shaft (9), are placed in the air channel, while the housing of the bearing unit (1) of the shaft (9) is placed in the cavity of the fairing

(3), and the housing of the bearing unit (2) of the shaft (9) is placed in the diffuser (4).

The cavity of the housing of the bearing assembly (1) is connected to the cavity of the fairing (3) by a pressure relief device (7), which is represented in the drawing in the form of a breather.

The oil baths (Ta and 2a) of the housings of the bearing units (1 and 2) are connected to the oil station bath (12) through drain pipes (15 and 25) connected to the drain line (10).

An additional breather (13) is placed in the inner cavity of the fairing (3), the pipeline (14) of which is introduced into the air cavity of the bath oil station (12).

The drain pipelines (165 and 25) are connected to each other by an air pipeline (11), which is also connected to the internal cavities of the housings of the bearing units (1 and 2), respectively, through a pressure relief device (7) (soap) and a connecting pipe (114).

In the operating mode, when the impeller (8) rotates, the air flow in the air channel (5), through the gap between the impeller and the wall of the fairing (3), creates negative pressure in the cavity of the fairing (3), while the negative pressure zone is in the cavity of the diffuser sleeve (4) is significantly less than in the closed cavity of the fairing (3), and accordingly, the load on the bearing seals is less, when the oil vapor pressure is created in the housing of the bearing unit (2). Thus, through the air pipeline (11), the pressure in the housing of the bearing assembly (1) is reduced by distributing it to the housing of the bearing assembly (2), while the pressure relief in the air pipeline (11) is also carried out due to the pressure relief device (7) (represented in the form of a breather or an ejector system), through which the channel of the air pipeline (11) is connected to the cavity of the bearing unit (1).

The connection of the gas pipeline (11) with the device for pressure relief (7) also allows you to exclude the closing of the drain hole of the oil baths (1a and 2a) during pressure equalization.

In addition, the negative pressure in the cavity of the fairing (3) is equalized with the pressure in the housings of the bearing units (1 and 2) connected to the air pipeline (11), due to the connection of the internal volume of the fairing (3) through the additional breather (13) installed in it ), connected by a pipeline (14) to the air cavity of the bath oil station (12).

Thus, the negative pressure in the fairing (3) through the additional breather (13) through the pipeline (14) is transferred to the bath of the oil station (12), and then from there through the drain line (10), the nozzle of which is immersed below the oil mirror (12a), and drain pipelines (165 and 25) enters the cavities of the housings of the bearing units (1 and 2), as a result of which the pressure drop inside the fairing (3) and in the cavities of the housings of the bearing units (1 and 2) is equalized.

To maintain a stable temperature in the bath oil station (12) and the housings of the bearing units (1 and 2) in the drain line (10), it is possible to additionally install an oil cooler (16) (drawing) at a distance H from the oil mirror (12a), which exceeds the height of the liquid column and proportional to the magnitude of the pressure drop in the mine.

Source of information: 1. Patent of the Russian Federation for the utility model Mo 165579 "System of pressure relief in the bearing unit of the rotor of axial turbomachines!".

Claims (2)

USEFUL MODEL FORMULA 1. The pressure relief system in the housing of the bearing unit of the rotor of the axial turbomachine, which contains at least one pressure relief device (7), fixed from above on at least one housing of the bearing unit (1) and connected to its internal cavity, with the possibility of relieving excess pressure in it of oil vapor, while the blades (right) of the impeller (8) of the turbomachine, placed between the fairing (3) and the diffuser cover (4), are led into the air channel (5) formed between the wall of the turbomachine body (6) and the walls of the fairing (3) ) with a diffuser cover (4), in the cavity of which another housing of the bearing assembly (2) is placed, and the housings of the bearing assemblies (1 and 2) of the shaft are made with oil baths (2a and Ta), which differs in that the oil baths (2a and And) the housings of the bearing assemblies (1 and 2) in the cavity of the fairing (3) and in the cavity of the diffuser sleeve (4) are connected to the drain pipelines (15 and 26), which are hydraulically connected to the tank of the oil station (12) and connected to gas of the pipeline (11), the channel of which is connected through a device for pressure relief (7) in the cavity of the fairing (3) with the cavity of the body of one bearing assembly (1), and in the cavity of the diffuser sleeve (4) through the connecting pipe ( 112), with the cavity of the housing of another bearing unit (2), while the cavity of the fairing (3) is connected, through the additional breather (13) installed in it, with the pipeline (14), with the air cavity of the oil station bath (12). From 2. The system according to claim 1, which differs in that the drain pipelines (156 and 20) are hydraulically connected to the oil station bath (12) through the drain line (10), the nozzle (1b0a) of which is immersed in the oil station bath (12) below level of the oil mirror (12a). Z. The system according to p. 2, which differs in that a drain filter (15) and an oil cooler (16) are installed on the drain line (10) in front of the oil station bath (12). 4. The system according to claim 1, which differs in that the oil cooler (16) is installed on the drain line (10) at the ratio Ne»y, where Н is the distance between the oil cooler (16) and the oil level in the oil station bath (12), and n - the height of the liquid column in the pipeline (10) inside the oil station bath (12) is proportional to the pressure drop in the mine.