CN202628784U

CN202628784U - Radial and thrust combined bearing of turbo expander

Info

Publication number: CN202628784U
Application number: CN 201220246780
Authority: CN
Inventors: 郝群; 丁俊
Original assignee: Sichuan Air Separation Plant (group) Co Ltd
Current assignee: Sichuan Air Separation Plant (group) Co Ltd
Priority date: 2012-05-30
Filing date: 2012-05-30
Publication date: 2012-12-26
Anticipated expiration: 2022-05-30

Abstract

The utility model discloses a radial and thrust combined bearing of a turbo expander. The radial and thrust combined bearing comprises a thrust bearing part and a radial bearing part, wherein a radial molded line of the radial bearing part comprises two axial oil distributing grooves and two oil wedge surfaces; each oil wedge surface consists of two eccentric arcs; an upper bush and a lower bush are respectively staggered in opposite directions; the thrust bearing part comprises more than two thrust bushes; each bush is provided with an oil supply hole and consists of a bush oil distributing groove, a bush oil wedge surface, a supporting surface and an oil drainage groove; and inner sides of inner arc edges of the oil drainage grooves of the thrust bearing part are closed. The radial and thrust combined bearing is stable and reliable, the temperature of the bearing is greatly reduced, a bearing burning phenomenon is eliminated basically, requirements on high linear velocity can be met, vibration amplitude is quite low, the inner sides of the inner arc edges of the oil drainage grooves are closed so that oil circulation is smooth, requirements on high linear velocity and high axial load can be well met, and the application scope of the bearing is greatly widened.

Description

Turbo-expander is the thrust joint bearing radially

Technical field

The utility model relates to radially thrust joint bearing of a kind of turbo-expander.

Background technique

Turbo-expander is a kind of blade mechanism of high speed rotating; Be effective machinery of realizing obtaining the low temperature cold near adiabatic isentropic expansion process; Be the core machinery of cryogenic device; Also be widely used at the machinery of energy field as recovered energy simultaneously, it more needs reliable and stable mechanical property except that will having good thermal performance, aerodynamic performance; Especially big for enthalpy drop, pressure is high, high, big, the high-power decompressor of end thrust of rotating speed.And the most employing of domestic cryogenic turboexpander industry radial bearing is three oil film wedges or four oil film wedge forms; Original old bearing of my company promptly is the four oil film wedge bearings that adopt, thrust bearing with radially be integrated, be commonly called as radially thrust associating oil bearing; In order to keep bearing temperature stable at zone of reasonableness and bearing; In the 200 multiclass decompressors before new bearing exploitation, 95% above linear velocity all is controlled at below the 60m/s, has only the only a few linear velocity near 70m/s.

In the decompressor design of the big enthalpy drop of middle pressure, the reliability of bearing, stable most important, but enthalpy drop is big, rotating speed is high; The pressure medium height needs to reduce the consumption of blanket gas, and main shaft just needs longer seal section, and cantilever is just long; In order to guarantee that rotor has favorable rigidity, the axle journal of bearing is thick as much as possible, short, to obtain sufficiently high critical speed of rotation; Bearing axis speed will be very high like this, near 80m/s, is sizable test to the bearing capacity and the stability of bearing.My Company products enthalpy drop Hs=23.6Kcal/Kg, expansion wheel diameter D1=200mm, bearing journal d=59.78mm; The highest running speed Nmax=32900rpm, the impeller linear velocity reaches 345m/s, and bearing axis speed is up to 103m/s; Bearing axis speed is at 85-90 m/s during the proper functioning rotating speed, and the old bearing traditional for this parameter is difficult to meet the demands, so my company designs this novel bearing again; This bearing scene is stable; Bearing temperature significantly reduces than before, compared to before the middle-pressure expansion machine end thrust big, often the burn bearing problem also solves basically.

The radially molded lines of traditional bearing is as shown in Figure 1, is made up of four rectangle oil distributing slots, four segment bases circle, four sections oil film wedge faces, and basic circle and main shaft axle journal gap and Rp gap are to get corresponding value according to factors such as axle journal size, load, rotating speeds; Thrust bearing is as shown in Figure 2, forms 4 input oil groove by 6 lobe thrust oil film wedge faces; 6 radially direct grooves have the little oil groove that unloads on the top of distributing slot, be supporting plane between distributing slot and the oil film wedge face; The gradient of same thrust gap, oil film wedge face, the size of oil groove are got corresponding value according to the relevant design parameter, and during this bearing on-line velocity 60m/s left and right sides, bearing temperature is at 50-65 ℃; When reaching 70m/s, axle temperature will be very near in addition surpass alarming value, owing to reasons such as oil film wedge bearing capacitys; The wide footpath of bearing need be obtained higher, and the bearing wasted work is also high, so this bearing can't satisfy up to the performance requirement of 90m/s.

The model utility content

The purpose of the utility model is the deficiency to traditional bearing, provide a kind of turbo-expander radially-the thrust joint bearing.

The purpose of the utility model realizes through following technical proposals:

A kind of turbo-expander is the thrust joint bearing radially; Comprise thrust bearing part and radial bearing part; The radially molded lines of said radial bearing part comprises 2 axial oil distributing slots, 2 sections oil film wedge faces; Said oil film wedge face is made up of two sections eccentric arcs, the tile fragment setting of staggering round about respectively up and down, and tile fragment is a dislocation type oil bearing; Said thrust bearing partly comprises two above thrust pads, and each tile fragment is provided with oil supply hole, tile fragment by tile fragment oil distributing slot, tile fragment oil film wedge face, supporting surface, unload oil groove and form; The inboard sealing in the interior circular arc limit of unloading oil groove of said thrust bearing, said cylindrical segmental arc of unloading oil groove are full open-type and unload oil groove with outside large circle and connect.

As optimal way, on bearing body, be evenly equipped with 3 dovetail grooves that are used for the make-up a bearing alloy.

As optimal way, said thrust bearing partly comprises 5 thrust pads.

As optimal way, the axial oil distributing slot of said radial bearing part is a rectangle oil distributing slot.

The beneficial effect of the utility model: this bearing is reliable and stable, and bearing temperature significantly reduces, compared to before the middle-pressure expansion machine end thrust big; Often the burn bearing problem also solves basically, can satisfy the high linear speed requirement, and vibration values is very little; The more favourable oil circulation of the inboard sealing in interior circular arc limit of unloading oil groove is unobstructed, operates lack of standardizationly the user, and the speed of for example going up and down is too fast; Operate too quickly, when interlocking stops, the axial force rapid change of rotor and when urgency, oil pumps such as power failure quit work, during the of short duration fuel feeding of oily accumulator; Can both guarantee to have guaranteed the Security of unit, well satisfy the requirement of high linear speed, high thrust load not by tile kilning; Widened bearing Applicable scope greatly, reserved very large space to the design of rotor system.

Description of drawings

Fig. 1 is the radially molded lines of traditional bearing.

Fig. 2 is traditional thrust bearing structure schematic representation.

Fig. 3 is the C-C unfolded drawing among Fig. 2.

Fig. 4 is the monnolithic case figure of the utility model.

Fig. 5 is the right elevation of Fig. 4.

Fig. 6 is the left view of Fig. 4.

Fig. 7 is that the A-A of Fig. 4 is to view.

Fig. 8 is the thrust bearing structure schematic representation of the utility model.

Fig. 9 is the B-B unfolded drawing of Fig. 8.

Among the figure, 1 is the thrust bearing part, and 2 is the radial bearing part, and 3 is the axial oil distributing slot, and 4 is dovetail groove, and 5 is the oil film wedge face, and 6 is oil supply hole, and 7 is tile fragment oil distributing slot, and 8 is tile fragment oil film wedge face, and 9 is supporting surface, and 10 for unloading oil groove.

Embodiment

Below in conjunction with specific embodiment and accompanying drawing the utility model is further described.

As shown in the figure; A kind of turbo-expander is the thrust joint bearing radially; Comprise thrust bearing part 1 and radial bearing part 2, the radially molded lines of said radial bearing part comprises 3,2 sections oil film wedge faces 5 of 2 axial oil distributing slots, and said oil film wedge face 5 is made up of two sections eccentric arcs; The tile fragment setting of staggering round about respectively up and down, tile fragment is a dislocation type oil bearing; Said thrust bearing part 1 comprises two above thrust pads, and each tile fragment is provided with oil supply hole 6, tile fragment by tile fragment oil distributing slot 7, tile fragment oil film wedge face 8, supporting surface 9, unload oil groove 10 and form, the said oil groove 10 that unloads is provided with unloading port; The inboard sealing in the interior circular arc limit of unloading oil groove 10 of said thrust bearing, said cylindrical segmental arc of unloading oil groove 10 are full open-type and unload oil groove with outside large circle and connect.

On bearing body, be evenly equipped with 3 dovetail grooves 4 that are used for the make-up a bearing alloy.

Said thrust bearing partly comprises 5 thrust pads.

The axial oil distributing slot 3 of said radial bearing part is a rectangle oil distributing slot.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.

Claims

1. turbo-expander thrust joint bearing radially; Comprise thrust bearing part (1) and radial bearing part (2); It is characterized in that: the radially molded lines of said radial bearing part comprises 2 axial oil distributing slots (3), 2 sections oil film wedge faces (5); Said oil film wedge face (5) is made up of two sections eccentric arcs, the tile fragment setting of staggering round about respectively up and down, and tile fragment is a dislocation type oil bearing; Said thrust bearing part (1) comprises two above thrust pads, and each tile fragment is provided with oil supply hole (6), tile fragment by tile fragment oil distributing slot (7), tile fragment oil film wedge face (8), supporting surface (9), unload oil groove (10) and form; The inboard sealing in the interior circular arc limit of unloading oil groove (10) of said thrust bearing, said cylindrical segmental arc of unloading oil groove (10) are full open-type and unload oil groove with outside large circle and connect.

2. turbo-expander as claimed in claim 1 is the thrust joint bearing radially, it is characterized in that: on bearing body, be evenly equipped with 3 dovetail grooves (4) that are used for the make-up a bearing alloy.

3. turbo-expander as claimed in claim 1 is the thrust joint bearing radially, it is characterized in that: said thrust bearing partly comprises 5 thrust pads.

4. turbo-expander as claimed in claim 1 is the thrust joint bearing radially, it is characterized in that: the axial oil distributing slot (3) of said radial bearing part is rectangle oil distributing slot.