RU2810108C1 - Output shaft mechanical seal assembly - Google Patents

Abstract

FIELD: motor engineering.

SUBSTANCE: sealing devices for sealing output shafts, including in bearing units of various engines, compressors, gearboxes, drives, where increased requirements for lubrication, sealing and cooling of the output shaft are imposed. The output shaft mechanical seal assembly includes a cylindrical hollow body with its fastening elements and includes a main chamber configured to be filled with oil; inner and outer flange covers with lip seals are installed at the ends of this body. In direct contact with the flange covers there are roller bearings facing the inside of the cylindrical hollow body, through covers with chambers and holes configured to allow the shaft to pass through them. Next, lip seals are installed, fixed to the through covers. At the bottom of each through cover, as well as in the cylindrical hollow body, there are drain holes with pipelines connected to the corresponding float chambers, including a float sensor. Moreover on top there are air holes coaxially made, equipped with breathers. Each of the indicated float chambers by a pipe through a corresponding pump and return valve interacts with the oil receiver, which, accordingly, is connected through a pipe to an inlet hole made in the upper part of the cylindrical hollow body, through which oil flows into the main chamber.

EFFECT: increasing the reliability and durability of devices with high loads on the output shaft by ensuring its constant lubrication and cooling.

2 cl, 2 dwg

Description

The invention relates to mechanical engineering, namely to sealing devices for sealing output shafts, including in bearing units of various engines, compressors, gearboxes, drives and other devices and devices with an output rotation shaft, where increased requirements for lubrication, sealing and cooling are imposed output shaft.

It is known from patent RU 2758659 C1, 01.11.2021, a seal containing a labyrinth gap formed by combining a disk located on a shaft and rotating with the shaft with alternating annular projections and depressions on the end surface with a stationary disk with alternating annular projections and depressions in response to the movable disk. end surface, a housing with a drainage hole, while the labyrinth gap is made stepped due to the end protrusions of the movable disk decreasing in height from the center of the disk to the periphery and the end cavities of the fixed disk decreasing in depth from the center of the disk to the periphery, and in the fixed disk in its lower part a blind groove is made, aligned with the drainage hole in the body, and a number of holes extending from it in the radial direction to each of the labyrinth chambers.

The disadvantage of the known device is the inability to lubricate the output shaft, which does not allow the use of this device in high-speed and heavily loaded mechanisms and devices.

As the closest analogue, the solution WO 2019228729, 05.12.2019, revealing

- a shaft sealing device for sealing the annular gap between the shaft and the stator from the space for the process working fluid to the external environment;

- wherein the device for sealing the shaft contains a magnetic-fluidic shaft seal;

- moreover, on the side of the space for the process working fluid, the shaft sealing device contains an additional shaft seal next to the magnetic-fluid shaft seal;

- wherein the magnetic fluid shaft seal is located in the annular gap in the axial direction between the first shaft seal and the external environment;

- moreover, in the annular gap between the additional shaft seal and the magnetic-fluid shaft seal in the axial direction, a pressure outlet is provided, while,

- the device has a storage tank for magnetic fluid, in which the magnetic fluid is accumulated, and wherein the storage tank for magnetic fluid is connected by pipelines for supplying magnetic fluid to the magnetic fluid seal or removing it.

The disadvantage of the known device is the inability to keep the output shaft constantly immersed in a cooling-lubricating liquid (oil), the inability to adjust the oil level when it drops and when it circulates.

The objective of the proposed invention is to eliminate these disadvantages.

The technical result is to increase the reliability and durability of units and mechanisms of devices with high loads on the output shaft, ensuring its constant lubrication and cooling.

This result is ensured by the fact that the output shaft mechanical seal assembly includes,

a cylindrical hollow body with elements of its fastening and includes a main chamber configured to be filled with oil,

internal and external flange covers with lip seals are installed at the end ends of the cylindrical hollow body,

Rolling bearings are installed in direct contact with the flange covers, facing the inside of the cylindrical hollow body,

after the rolling bearings, on each side there are through covers with chambers and holes made with the possibility of the shaft passing through them,

after the through covers, lip seals are installed, fixed to the through covers,

at the bottom in each through cover, as well as in the cylindrical hollow body, there are lower drain holes with pipelines connected to the corresponding float chambers, including a float sensor,

on top of each through cover, as well as in the cylindrical hollow body, upper air holes equipped with breathers are made coaxially,

in this case, each of these float chambers interacts via a pipe through a corresponding pump and a check valve with an oil receiver, which, accordingly, is connected via a pipe to an inlet hole made in the upper part of the cylindrical hollow body, through which oil flows into the main chamber.

After the through covers, lip seals are additionally installed and fixed to the through covers.

A shut-off valve is installed on top of the oil receiver, connected via a pipeline to the end part of the cylindrical hollow body to create pressure from the end side.

We will consider the detailed design of the device taking into account the attached drawings, where

Fig. 1 - main view of the output shaft mechanical seal assembly;

Fig. 2 - example of device implementation;

Where is the position:

1 - cylindrical hollow body;

2 - main camera;

3 - flange cover;

4 - rolling bearing;

5 - through cover;

6 - camera;

7 - drain hole;

8 - air hole;

9 - breather;

10 - float sensor;

11 - float chamber;

12 - pump;

13 - check valve;

14 - inlet;

15 - oil receiver.

The output shaft mechanical seal assembly includes a cylindrical hollow housing 1 with elements for its fastening to the corresponding mating part of the mechanism/drive. The fastening elements are made, for example, in the form of an annular surface with holes for bolts, in the form of lugs, or in another way. The cylindrical hollow body 1 has a through hole for the shaft to pass through it, as well as for filling it with the corresponding elements. The cylindrical hollow body 1 is usually made of metal, preferably cast iron.

The central part of the cylindrical hollow body 1 includes a main chamber 2 configured to be filled with oil to maintain constant lubrication and cooling of the passing shaft.

At the end ends of the cylindrical hollow body 1, internal and external flange covers 3 with lip seals are installed (not indicated by a position in the figure). Flange covers 3 are fixed to the ends of the cylindrical hollow body 1, for example, with a screw connection. In addition, the specified flange covers 3 serve as a support for the rolling bearings 4 that follow them and are in direct contact with them, facing the inside of the cylindrical hollow housing 1. The rolling bearings 4 can be different, for example, ball, roller, needle and other bearings that provide easy rotation of the output shaft.

After the rolling bearings 4 in the proposed device, through covers 5 with holes made for the shaft to pass through them are installed on each side. Through covers 5 contain chambers 6, facing outward with their surface. These chambers 6 collect oil and discharge it into the float chambers 11, for which purpose lower drain holes 7 with pipelines connected to the corresponding float chambers 11 are made below in each through cover 5, as well as in the cylindrical hollow body 1.

The float chambers 11 include a float sensor 10 inside. The oil level float sensor 10 can have a different design, which is not limited in any way, but must provide constant measurement and monitoring of the oil level in the float chambers 11 and transmit a signal about its high level to the corresponding pump 12, which will be discussed in more detail below.

On top, in each through cover 5, as well as in the cylindrical hollow body 1, upper air holes 8 are coaxially made, equipped with breathers 9. Alternatively, one of the air holes 8 can be directed inside the end part of the cylindrical hollow body 1 (sealed device) to create of a given cavity pressure is higher or lower than atmospheric. Breather 9 is designed to maintain a given pressure inside the output shaft mechanical seal assembly.

After the through covers 5, sealing cuffs are installed (not indicated by a position in the figure), fixed to the specified through covers 5, for example, pressed by spacers or, as shown in figure 1, by means of two springs, one of their ends resting on the protrusion on the shaft, and the other - pressing the cuff, or the lip seals are part of the shaft structure, which is not the subject of protection of this application.

Each of the indicated float chambers 11 interacts with the oil receiver 15 through the pipe through the corresponding pump 12 and the check valve 13. When the float sensor 10 is triggered, the corresponding pump 12 is turned on and pumps oil through the pipeline into the oil receiver 15, while the check valve 13 prevents the reverse flow of oil from the specified oil receiver 15. The float sensor 10 also transmits a signal to stop pumping when the oil level in the float chambers 11 reaches a minimum value.

The oil receiver 15 is a container that receives oil and distributes it through some output node and according to a certain algorithm, which is not the scope of this application.

The oil receiver 15 is connected through a pipe to an inlet 14 made in the upper part of the cylindrical hollow body 1, through which oil cyclically flows into the main chamber 2.

In the oil receiver 15 there is a shut-off valve installed on top, configured to open and close it. The shut-off valve is connected by a pipeline to the end part of the cylindrical hollow body 1 to create pressure above or below atmospheric pressure, if this is necessary for a given mode and type of device.

The device works as follows.

The output shaft mechanical seal assembly is connected to the drive/mechanism through fastening elements, while the output shaft passes through a cylindrical hollow housing 1.

The cylindrical hollow body 1 includes a main chamber 2, which is completely filled with oil from the oil receiver 15 through the inlet 14 by means of pumps 12, which receive a signal from the oil level float sensor 10.

During operation of the device, oil from the main chamber 2 gradually flows into the chambers 6 of the through covers 5, and from there flows into the float chambers 11.

When the device operates inside the main chamber 2 and chambers 6 of the through covers 5, pressure will be established depending on the pressure in the device being sealed. For example, if the pressure in the device being sealed is higher than atmospheric pressure, then the pressure in the main chamber 2 and chambers 6 will correspond to the pressure in the device being sealed. If the pressure in the device being sealed is below atmospheric pressure, in the main chamber 2 and chambers 6 the pressure will correspond to atmospheric pressure. The pressure is equalized through breathers 9.

When the oil level in the float chambers 11 increases, the float sensor 10 is triggered and the oil from the float chambers 11 is pumped into the oil receiver 15, and from there it fills the main chamber 2 through the pipeline through the inlet 14. The cycle is repeated.

Example 1

The output shaft mechanical seal assembly includes:

- a cylindrical hollow body 1 with its fastening elements in the form of lugs,

- a cylindrical hollow body 1 includes a main chamber 2 configured to be filled with oil,

- internal and external flange covers 3 with lip seals are installed at the end ends of the cylindrical hollow body 1,

- in direct contact with the flange covers 3, rolling bearings 4 are installed, facing the inside of the cylindrical hollow body 1,

- after the rolling bearings 4, on each side there are through covers 5 with holes made for the shaft to pass through them, containing chambers 6,

- after the through covers, lip seals are installed, fixed to the through covers,

- at the bottom of each through cover 5, as well as in the cylindrical hollow body 1, there are lower drain holes 7 with pipelines connected to the corresponding float chambers 11, including a float sensor 10,

- on top of each through cover 5, also in the cylindrical hollow body 1, upper air holes 8 are coaxially made, equipped with breathers 9,

- each of the indicated float chambers 11 through the pipe through the corresponding pump 12 and check valve 13 interacts with the oil receiver 15, which, accordingly, through the pipe is connected to the inlet 14, through which oil flows into the main chamber 2.

Example 2

The output shaft mechanical seal assembly includes:

- a cylindrical hollow body 1 with its fastening elements in the form of mounting holes,

- a cylindrical hollow body 1 includes a main chamber 2 configured to be filled with oil,

- internal and external flange covers 3 with lip seals are installed at the end ends of the cylindrical hollow body 1,

- in direct contact with the flange covers 3, rolling bearings 4 are installed, facing the inside of the cylindrical hollow body 1,

- after the rolling bearings 4, on each side there are through covers 5 with holes made for the shaft to pass through them, containing chambers 6,

- after the through covers 5, lip seals are installed, fixed to the through covers 5,

- at the bottom of each through cover 5, as well as in the cylindrical hollow body 1, there are lower drain holes 7 with pipelines connected to the corresponding float chambers 11, including a float sensor 10,

- on top of each through cover 5, also in the cylindrical hollow body 1, upper air holes 8 are coaxially made, equipped with breathers 9,

- each of the indicated float chambers 11 through the pipe through the corresponding pump 12 and check valve 13 interacts with the oil receiver 15, which, accordingly, through the pipe is connected to the inlet 14, through which oil flows into the main chamber 2,

- in the oil receiver 15 there is a shut-off valve installed on top, connected by a pipeline to the end part of the cylindrical hollow body 1.

The proposed solution provides increased reliability and durability in units and mechanisms of devices with high loads on the output shaft, ensuring its constant lubrication and cooling.

Claims (2)

1. An output shaft mechanical seal assembly, characterized in that it contains a cylindrical hollow body with elements of its fastening and includes a main chamber configured to be filled with oil; inner and outer flange covers with lip seals are installed at the end ends of the cylindrical hollow body, in direct In contact with the flange covers, rolling bearings are installed facing the inside of the cylindrical hollow housing; after the rolling bearings, on each side there are through covers with chambers and holes made with the possibility of a shaft passing through them, at the bottom in each through cover, as well as in the cylindrical hollow housing lower drain holes are made with pipelines connected to the corresponding float chambers, including a float sensor, after the through covers, lip seals are installed, fixed to the through covers, on top of each through cover, as well as in the cylindrical hollow body, upper air holes equipped with breathers are made coaxially, in this case, each of these float chambers interacts via a pipe through a corresponding pump and a check valve with an oil receiver, which, accordingly, is connected via a pipe to an inlet hole made in the upper part of the cylindrical hollow body, through which oil flows into the main chamber. 2. The unit according to claim 1, characterized in that a shut-off valve is installed on top of the oil receiver, connected by a pipeline to the end part of the cylindrical hollow body to create pressure above or below atmospheric pressure.

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