CN103557229A

CN103557229A - Design method of water lubrication step tile dynamic pressure thrust bearing

Info

Publication number: CN103557229A
Application number: CN201310500923.9A
Authority: CN
Inventors: 张远海; 朱挺; 尹忠慰; 张秀丽
Original assignee: SHENKE SLIDE BEARING Inc
Current assignee: SHENKE SLIDE BEARING Inc
Priority date: 2013-10-22
Filing date: 2013-10-22
Publication date: 2014-02-05

Abstract

The invention discloses a design method of a water lubrication step tile dynamic pressure thrust bearing. The design method comprises the following steps of (1) determining an inner diameter and an outer diameter of the thrust bearing according to an operating working condition and an installing size of the thrust bearing; (2) determining the number of thrust tiles according to the inner diameter and the outer diameter of the thrust bearing; (3) determining the shape and the size of a water tank; (4) determining positions and sizes of steps on the surfaces of the thrust tiles; and (5) determining the position of a water inlet. According to the method, aiming at the blank of a water lubrication bearing design, by researching a lubrication model of a common-size step tile dynamic pressure thrust bearing under the water lubrication working condition, and analyzing the influence on the bearing capacity of the bearing and the rigidity of a water film caused by the structure size and the operation working condition of the step tile thrust bearing, the most optimized design method is obtained, the water lubrication bearings with same sizes bear large load and are long in service life.

Description

A kind of design method of water lubrication ladder watt Hydrodynamic Thrust Bearings

Technical field:

The present invention relates to technical field of bearings, especially relate to a kind of design method of water lubrication ladder watt Hydrodynamic Thrust Bearings.

Background technique:

Hydraulic bearing is widely used in boats and ships, pump, water turbine, steam turbine and other industry equipments, because oil viscosity is large, can produce larger dynamic pressure bearing capacity, so hydraulic bearing is usingd oil conventionally as lubricant medium, but also therefore consumed a large amount of oil plants, the water environment pollution problem causing because of oil leak is also on the rise.

Water is wide, safe as a kind of source, free of contamination resource, makes water lubriucated bearing in recent years become the trend that bearing develops.Oil lubrication theory is comparatively ripe, has a large amount of design diagrams, formula to follow on mechanical design handbook.Because the ratio of viscosities oil of water is much smaller, the bearing capacity of water lubrication is much smaller than oil lubrication, and water meeting generation cavitation phenomenon under large negative pressure, so when carrying out the design of water lubriucated bearing, original design diagram is no longer applicable, need to find new design method.

As shown in Figure 1: ladder watt thrust-bearing (internal-and external diameter is respectively Di, Do) is comprised of a plurality of tanks 10 and ladder tile fragment 20, ladder tile fragment comprises two, and to have the tread 2a of height difference δ and the width of 2b(tread 2a and 2b be B, length is respectively L1 and L2), ladder surface can be made with coining method or aciding, simpler, easy to process than thrust bearings such as inclined-plane watt, spiral chutes.Its formation working surface that matches with Thrust ring 30, Thrust ring 30 can only rotate to high ladder surface 2b from low ladder surface 2a, and a ladder watt thrust-bearing is used for small size bearing.

For oil lubrication, by the method for numerical calculation or experimental simulation, a ladder watt Hydrodynamic Thrust Bearings has been done to large quantity research both at home and abroad, some design proposals have been proposed.But because complexity and the condition of computation model are limit, great majority research is all simplified thrust bearing pad, segmental pad is reduced to rectangle watt, the result so calculating and actually have a certain distance, therefore need to set up more real computation model for water lubrication ladder watt Hydrodynamic Thrust Bearings, consider the cavitation phenomenon of water, obtain the project organization of bearing optimum, make the moisture film rigidity of identical load lower bearing maximum.

Summary of the invention:

Object of the present invention provides a kind of design method of water lubrication ladder watt Hydrodynamic Thrust Bearings with regard to being the deficiency existing for prior art, it is simple in structure, easy to process, more easily applies.

For achieving the above object, the design method of a kind of water lubrication ladder watt Hydrodynamic Thrust Bearings of the present invention comprises the steps:

(1) according to the operating conditions of thrust-bearing and installation dimension, determine the inside/outside diameter size of thrust-bearing;

(2) according to the inside/outside diameter size of thrust-bearing, determine thrust pad quantity;

(3) determine tank shape and size;

(4) determine position and the size of thrust pad surface ladder;

(5) determine water inlet position.

As technique scheme preferably, described bearing outside diameter is of a size of 1.5～3 times of internal diameter.

As technique scheme preferably, described tile fragment quantity depends on bearing bore diameter, the condition that tile fragment number need be satisfied is that tile fragment breadth length ratio is not less than 1.

As technique scheme preferably, semicircle, triangle, rectangular or trapezoidal that described tank sectional shape seamlessly transits for band; Tank width accounts for 0.7～0.85 of thrust face by tank and calculates, and the tank degree of depth is 1～8mm; As axis horizontal, the tank degree of depth must be less than 0.5mm.

As technique scheme preferably, described ladder position, tile fragment surface determines by the breadth length ratio of tile fragment, the water film thickness of tile fragment ladder height during according to operation determine, water film thickness by operating conditions and sizing calculate and obtain.

As technique scheme preferably, described water inlet position must near thrust-bearing internal diameter or in.

Beneficial effect of the present invention is: it is for the blank of water lubriucated bearing design, by the lubrication model of Commonly Used Size ladder watt Hydrodynamic Thrust Bearings under research water lubrication operating mode, analyze physical dimension, the impact of operating conditions on bearing load carrying capacity, moisture film rigidity of ladder watt thrust-bearing, obtained optimized design method, the water lubriucated bearing bearing load that makes same size is larger, longer service life.

Accompanying drawing explanation:

Below in conjunction with accompanying drawing, the present invention is described further:

Fig. 1 is the structural representation of ladder thrust-bearing;

Fig. 2 is the operation schematic diagram of ladder thrust-bearing;

Fig. 3 is that ladder thrust-bearing internal-and external diameter is selected design diagram;

Fig. 4 is one of tank sectional view of ladder thrust-bearing;

Fig. 5 be ladder thrust-bearing tank sectional view two;

Fig. 6 be ladder thrust-bearing tank sectional view three;

Fig. 7 be ladder thrust-bearing tank sectional view four;

Fig. 8 is the ladder Position Design chart of ladder thrust-bearing;

Fig. 9 is ladder thrust-bearing bearing capacity factor design diagram.

Embodiment:

Therefore the following stated, only for embodying the preferred embodiment of the principle of the invention, does not limit protection scope of the present invention.

Consult shown in Fig. 1～Fig. 7: the design method of a kind of water lubrication ladder watt Hydrodynamic Thrust Bearings of the present invention comprises the steps:

(1) operating conditions (rotating speed, load) and the installation dimension of clear and definite water lubricating thrust bearing application, with reference to the internal diameter of figure 2 selection bearings, bearing outside diameter size is generally 1.5～3 times of internal diameter size;

(2) according to determined thrust-bearing internal diameter, thrust pad number can be selected according to following table, and bearing size is larger, and tile fragment number should be more, to there is more tank to make bearing surface fully form dynamic pressure moisture film, reduces fretting wear;

Internal diameter (mm)	15-25	25-35	35-45	45-65	65-80	80-
							Tile fragment number	6	8	10	12	16	20

If not according to upper table, thrust pad number must meet thrust pad breadth length ratio and is not less than 1, i.e. B/L >=1.

(3) tank sectional shape, as shown in Fig. 3～Fig. 7, can be semicircle, triangle, rectangular or trapezoidal that band seamlessly transits; Tank width can account for thrust face ratio in tank and calculate and obtain, and this ratio is generally 0.7～0.85; The tank degree of depth is not designed to 1～8mm not etc. according to bearing size, and bearing is larger, and tank is darker; If but axis horizontal, tank must be less than 0.5mm, in order to avoid too much water releases and causes top bearing shell lack of water from bottom tank;

(4) position of tile fragment surface ladder is checked in by Fig. 8 according to tile fragment breadth length ratio, when tile fragment ladder height is designed to move 0.6～0.8 of water film thickness times, water film thickness can according to operating conditions and sizing calculate and to obtain, wherein loading ability of bearing coefficient is checked in by Fig. 9.

(5) determine water inlet position, water inlet position must near thrust-bearing internal diameter or in.

Claims

1. a design method for water lubrication ladder watt Hydrodynamic Thrust Bearings, is characterized in that comprising the steps:

(3) determine tank shape and size;

(4) determine position and the size of thrust pad surface ladder;

(5) determine water inlet position.

2. the design method of water lubrication ladder watt Hydrodynamic Thrust Bearings according to claim 1, is characterized in that: described bearing outside diameter is of a size of 1.5～3 times of internal diameter.

3. the design method of water lubrication ladder watt Hydrodynamic Thrust Bearings according to claim 1, is characterized in that: described tile fragment quantity depends on bearing bore diameter, and the condition that tile fragment number need be satisfied is that tile fragment breadth length ratio is not less than 1.

4. the design method of water lubrication ladder watt Hydrodynamic Thrust Bearings according to claim 1, is characterized in that: semicircle, triangle, rectangular or trapezoidal that described tank sectional shape seamlessly transits for band; Tank width accounts for 0.7～0.85 of thrust face by tank and calculates, and the tank degree of depth is 1～8mm; As axis horizontal, the tank degree of depth must be less than 0.5mm.

5. the design method of water lubrication ladder watt Hydrodynamic Thrust Bearings according to claim 1, it is characterized in that: described ladder position, tile fragment surface is determined by the breadth length ratio of tile fragment, tile fragment ladder height determines according to the water film thickness in when operation, water film thickness by operating conditions and sizing calculate and obtain.

6. the design method of water lubrication ladder watt Hydrodynamic Thrust Bearings according to claim 1, is characterized in that: described water inlet position must near thrust-bearing internal diameter or in.