CN111998005A - Cooling and flushing structure of water lubrication thrust bearing - Google Patents

Abstract

The invention discloses a cooling and flushing structure for a water-lubricated thrust bearing, belonging to the technical field of fluid machinery. and the main impeller; the auxiliary shaft, the auxiliary impeller, the rolling bearing, the main impeller and the thrust plate are assembled into a whole, and are symmetrically installed on the main shaft through the key, and are positioned using the shaft sleeve and the shaft step of the main shaft; the thrust bearing has The through hole connects the area I and the area II, the peripheral area of the auxiliary impeller is the area I, and the right area of the thrust bearing is the area II; the main impeller is located in the thrust disc. The structure of the present invention can utilize the excess pressure energy generated when the thrust disc is used as an auxiliary impeller, strengthen the cooling and heat exchange of the thrust bearing, enhance the heat exchange effect in the thrust disc area, prolong the service life of the thrust bearing, and thus improve the operation reliability of the unit. , reducing maintenance costs.

Description

A cooling flushing structure for water lubricated thrust bearing

technical field

The invention relates to the technical field of fluid machinery, in particular to a cooling and flushing structure for a water-lubricated thrust bearing.

Background technique

In high-speed pump units such as mining high-speed emergency pumps, wet motors are used to ensure the reliability of the motors. In the wet motor, a wedge-shaped water film is formed between the thrust disc and the thrust bearing to balance the axial force of the unit. Due to the complex working conditions of the unit, the thrust bearing generates serious heat. Under the existing unit structure, the cooling of the thrust bearing is not sufficient. In the long run, the thrust bearing will be damaged, which will affect the normal operation of the entire pump unit.

At the same time, in order to further reduce the overall length of the unit, the thrust plate is generally used to open radial holes as auxiliary impellers to provide the internal circulation power source of the motor. In order to ensure the balance effect of the axial force, the outer diameter of the thrust bearing and the thrust plate is generally larger, so that a large lift can be generated in the radial hole of the thrust plate. Consumption is wasted and does not meet the requirements of energy saving and environmental protection.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a cooling and flushing structure for a water-lubricated thrust bearing, which can utilize the excess pressure energy generated when the thrust disc is used as an auxiliary impeller to enhance the cooling and heat exchange of the thrust bearing, and enhance the heat exchange effect in the thrust disc area, extending the The service life of the thrust bearing. Thereby, the operation reliability of the unit is improved, and the maintenance cost is reduced.

The invention is a cooling and flushing structure for a water-lubricated thrust bearing, comprising: a main shaft, a thrust disc, a thrust bearing and an auxiliary shaft; the auxiliary shaft is installed with an auxiliary impeller, a rolling bearing and a main impeller in order from left to right in the horizontal position; the auxiliary shaft , Auxiliary impeller, rolling bearing, main impeller and thrust plate are assembled into a whole, and are symmetrically installed on the main shaft through keys, and are positioned by the shaft sleeve and the shaft step of the main shaft; the thrust bearing has a through hole, and the through hole is connected to the area I and area II, the peripheral area of the auxiliary impeller is area I, and the area to the right of the thrust bearing is area II; the main impeller is located in the thrust disc.

The thrust bearing is tightly connected with the thrust bearing press cover, and the thrust bearing press cover is fixedly connected with the motor wall. The above three are fixed parts. The thrust bearing is composed of a plurality of bearing bushes, a channel is arranged between the bearing bushes, a through hole is arranged inside, one end of the through hole is connected to the area I, and one end of the through hole is connected to the area II.

The thrust plate is a whole which is tightly connected by the left thrust plate and the right thrust plate. The left thrust plate is provided with an axial through hole, and the axial through hole is provided with a step; the position corresponding to the axial through hole is provided. A radial through hole is opened on the right thrust plate. The main impeller is located in the radial through hole of the right thrust plate. One end of the through hole in the thrust bearing in the region I faces the impeller outlet of the auxiliary impeller.

The rolling bearing is positioned using the shaft step of the auxiliary shaft and the step in the axial through hole of the left thrust plate.

After the assembly is completed, the thrust plate is located on the left side of the thrust bearing as a whole, and there is a gap between the surface of the thrust plate and the thrust bearing.

During the working process of the unit, the motor cavity is filled with coolant. The left thrust disc and the right thrust disc are assembled to form a whole, the right thrust disc has a radial through hole, and the main impeller is in the radial through hole. During the working process of the unit, the left thrust plate and the right thrust plate rotate with the main shaft at high speed. Due to the pumping effect, the liquid in the motor cavity will flow into the bottom of the radial through hole of the right thrust plate. After flowing into the radial through hole, the liquid impacts the blades of the main impeller, pushing the main impeller to rotate. After the main impeller rotates, it drives the auxiliary shaft and the auxiliary impeller to rotate together. After the auxiliary impeller rotates, on the one hand, the cooling liquid at the outlet of the auxiliary impeller can have high-pressure energy, thereby overcoming the resistance along the path and the local resistance in the through hole of the thrust bearing, forming the flow between the area I and the area II, and in the flow process, the thrust is negatively affected. The bearing dissipates heat; on the other hand, during the rotation of the auxiliary impeller, the heat accumulation between the regions II can also be reduced, which can achieve a better heat dissipation effect.

The beneficial effects of the present invention are as follows: the cooling and flushing structure of the water-lubricated thrust bearing provided by the present invention utilizes the excess pressure energy generated by the thrust disc in the wet motor as an auxiliary impeller, thereby ensuring the cooling of the thrust bearing in the wet motor unit, and at the same time It also brings a better heat dissipation effect to the area near the thrust plate, prolongs the service life of the thrust bearing and the thrust plate, thus improves the operation reliability of the unit and reduces the maintenance cost; and the thrust plate is used as an auxiliary impeller when used. The excess pressure energy generated meets the requirements of energy saving and environmental protection.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention. in,

1. Main shaft; 2. Key; 3. Bushing pin; 4. Bushing, 5. Thrust bearing, 6. Thrust bearing gland; 7. Bearing pin; 8. Gland pin; 9. Motor wall; 10. Auxiliary Shaft; 11, pin of auxiliary impeller; 12, auxiliary impeller; 13, rolling bearing; 14, pin of thrust disc; 15, left thrust disc; 16, right thrust disc; 17, pin of main impeller; 18, main impeller;

101. Thrust bearing through hole; 102, axial through hole; 103, radial through hole.

FIG. 2 is an enlarged schematic view of the area A in FIG. 1 .

Figure 3 is a schematic diagram of the left thrust plate.

Figure 4 is a schematic diagram of the right thrust plate.

Figure 5 is a schematic diagram of a thrust bearing.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

Example 1

As shown in Figures 1-2, a cooling and flushing structure for a water-lubricated thrust bearing of the present invention includes: a main shaft 1, a thrust disc, a thrust bearing 5 and an auxiliary shaft 10; the auxiliary shaft 10 is installed in sequence from left to right in the horizontal position Auxiliary impeller 12, rolling bearing 13 and main impeller 18; the auxiliary shaft 10, auxiliary impeller 12, rolling bearing 13, main impeller 18 and thrust plate are assembled into a whole, and are symmetrically installed on the main shaft 1 through the key 2, using the bushing 4 and the axis step positioning of spindle 1;

The thrust plate is installed on the main shaft 1, and forms a water film with the thrust bearing 5 to balance the axial force;

A through hole 101 is opened in the thrust bearing 5, the through hole connects the area I and the area II, the peripheral area of the auxiliary impeller 12 is the area I, and the right area of the thrust bearing 5 is the area II.

The thrust disc is a whole formed by the left thrust disc 15 and the right thrust disc 16 being fastened and connected by the thrust disc pin 14. The left thrust disc 15 is provided with an axial through hole 102, and the axial through hole 102 is provided with an axial through hole 102. Steps; a radial through hole 103 is opened on the right thrust disk 16 at the position corresponding to the axial through hole of the left thrust disk 15 .

The main impeller 18 is located in the radial through hole 103 of the right thrust plate 16 .

Example 2

The assembly structure of the cooling flushing structure of the water lubricated thrust bearing of the present invention:

As shown in FIG. 2 , in the horizontal direction of the auxiliary shaft 10, from right to left, the rolling bearing 13 is assembled on the auxiliary shaft 10, and the left end of the rolling bearing 13 is positioned with the second-stage right shaft stage of the auxiliary shaft 10 (the auxiliary shaft 10 starts from the right in the horizontal direction). second axis step).

In the horizontal direction, from left to right, the auxiliary shaft 10 and the rolling bearing 13 that has completed the positioning of the left end are installed into the assembly ring groove of the left thrust plate 15 from left to right, and the rolling bearing 13 and the left thrust plate 15 are assembled in the ring groove to complete the positioning and fixing of the right end.

In the horizontal direction, from right to left, the main impeller 18 is installed on the auxiliary shaft 10, and the right end of the main impeller 18 is positioned with the first right shaft step of the auxiliary shaft 10 (the first shaft step from the right in the horizontal direction of the auxiliary shaft 10). Then, the main impeller 18 is fixed on the auxiliary shaft 10 using the main impeller pin 17 .

In the horizontal direction, from left to right, the left thrust disc 15 and the right thrust disc 16 are fastened with the thrust disc pin 14 to complete the fastening connection.

In the horizontal direction, from left to right, install the auxiliary impeller 12 on the auxiliary shaft 10. The right end of the auxiliary impeller 12 is positioned with the first left shaft step of the auxiliary shaft 10 (the first shaft step from the left in the horizontal direction of the auxiliary shaft 10). After that, the auxiliary impeller 12 is fixed to the auxiliary shaft 10 using the auxiliary impeller pin 11 .

In the horizontal direction, from right to left, assemble the assembled auxiliary shaft 10, left thrust disc 15, right thrust disc 16, main impeller 18, and auxiliary impeller 12 to the main shaft 1, and use the shaft step of the main shaft 1 to locate the left end.

In the horizontal direction, from right to left, assemble the bushing 4 to the main shaft 1, and use the bushing pin 3 to fasten the connection.

In the horizontal direction, from right to left, assemble the thrust bearing gland 6 to the motor wall 9, and use the gland pins 8 to fasten the connection. In the horizontal direction, from left to right, assemble the thrust bearing 5 to the thrust bearing gland 6, using the bearing The pin 7 makes a tight connection.

Assemble the main shaft 1 and all the fittings on the main shaft 1 and the thrust bearing 5 to complete the assembly.

The thrust bearing 5 is composed of a plurality of bearing pads, and a plurality of channels are opened in the bearing pads, which connect the central area of the bearing pad and the outer edge area of the bearing pad.

The working principle of the present invention: During the working process of the unit, the motor cavity is filled with cooling liquid. After the left thrust disc 15 and the right thrust disc 16 are assembled, they form a whole. The right thrust disc 16 has a radial through hole 103 , and the main impeller 18 is in the radial through hole 103 . During the operation of the unit, the left thrust plate 15 and the right thrust plate 16 rotate with the main shaft 1 at high speed. Due to the pumping effect, the liquid in the motor cavity will flow into the bottom of the radial through hole 103 of the right thrust plate 16 . After flowing into the radial through hole 103 , the liquid impacts the blades of the main impeller 18 and pushes the main impeller 18 to rotate. After the main impeller 18 rotates, the auxiliary shaft 10 and the auxiliary impeller 12 are driven to rotate together. After the auxiliary impeller 12 rotates, on the one hand, the cooling liquid at the outlet of the auxiliary impeller 12 can have high pressure energy, so as to overcome the resistance along the path and the local resistance in the through hole 101 of the thrust bearing 5, and form the flow between the region I and the region II. During the process, the thrust bearing 5 is dissipated; on the other hand, during the rotation of the auxiliary impeller 12, the heat accumulation between the regions II can also be reduced, and a better heat dissipation effect can be achieved.

The cooling and flushing structure of the water-lubricated thrust bearing provided by the present invention utilizes the excess pressure energy generated by the thrust disk in the wet motor as the auxiliary impeller, so as to ensure the cooling of the thrust bearing in the wet motor unit, and at the same time, it also reduces the pressure on the attachment area of the thrust disk. It has better heat dissipation effect and prolongs the service life of thrust bearing and thrust plate, thus improving the operation reliability of the unit and reducing the maintenance cost. And the excess pressure energy generated when the thrust disc is used as an auxiliary impeller is used to achieve the requirements of energy saving and environmental protection.

Claims (5)

1. A cooling and flushing structure for a water lubricated thrust bearing comprising: the device comprises a main shaft (1), a thrust disc, a thrust bearing (5), an auxiliary shaft (10), an auxiliary impeller (12), a rolling bearing (13) and a main impeller (18); an auxiliary impeller (12), a rolling bearing (13) and a main impeller (18) are sequentially arranged from left to right on the horizontal position of the auxiliary shaft (10); the auxiliary shaft (10), the auxiliary impeller (12), the rolling bearing (13), the main impeller (18) and the thrust disc are assembled into a whole, are symmetrically arranged on the main shaft (1) through the key (2), and are positioned by using the shaft sleeve (4) and the shaft step of the main shaft (1); a through hole (101) is formed in the thrust bearing (5), the through hole (101) is communicated with the area I and the area II, the peripheral area of the auxiliary impeller (12) is the area I, and the area on the right side of the thrust bearing (5) is the area II; the main impeller (18) is located within the thrust disc.

2. The cooling and flushing structure of the water-lubricated thrust bearing, as recited in claim 1, characterized in that the thrust disk is a whole formed by fastening and connecting a left thrust disk (15) and a right thrust disk (16) by a thrust disk pin (14), the left thrust disk (15) is provided with an axial through hole (102), and the axial through hole (102) is provided with steps; a radial through hole (103) is arranged on the right thrust disc (16) corresponding to the axial through hole (102) of the left thrust disc (15).

3. A cooling and flushing arrangement for a water lubricated thrust bearing as claimed in claim 2, in which the main impeller (18) is located in a radial through hole (103) in the right thrust disc (16).

4. A cooling and flushing arrangement for a water lubricated thrust bearing as claimed in claim 2, characterized in that said rolling bearing (13) is positioned using the axial step of the auxiliary shaft (10) and the step in the axial through hole (102) of the left thrust disk (15).

5. The cooling and flushing structure of a water-lubricated thrust bearing as claimed in claim 1, wherein the end of the through hole (101) in the region i faces the impeller outlet of the sub-impeller (12).

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