JPS6081517A - Submersible bearing - Google Patents

Abstract

PURPOSE:To obtain stabilized sliding peculiarities even within both a liquid and gas, by arranging a segment made of a stationary side component made of ceramics of Si3N4 or SiC annularly on a circumferential surface of a rotary side component made of carbide alloy containing WC. CONSTITUTION:A shaft sleeve 21 made of carbide alloy containing tungsten carbide (WC) is sticked to a shaft 5' and a bearing 23 made of ceramics divided in a segmented state through a metal case 22 is fixed to a submersible bearing support 16. Each of ceramic pieces obtained by dividing in the segmented state is arranged annularly so that it is inserted into a fitting hole formed on the inside of the metal case 22 and an inner circumferential surface of each of the ceramic pieces is fixed to an external circumferential surface of the shaft sleeve 21 so that it is made into a state close to line contact. This ceramic piece is made of either Si3N4 or SiC.

Description

DETAILED DESCRIPTION OF THE INVENTION Regarding bearings, in particular, the spindle 7j is operated under non-lubricated conditions by being placed in gas during startup and stop, and is operated in water or slurry during steady operation. pump or dimple
This relates to underwater bearings used in lll pumps.

Conventionally, rubber bearings, lead bronze bearings, etc. have been used as underwater bearings for spindle pumps and oblique +f'+f+ pumps.

However, when starting these pumps, the submersible bearings are often placed in gas, making it difficult to start them in that state.

The reason is that both rubber bearings and metal bearings such as lead bronze.

When used underwater or lubricated with water or oil, it exhibits extremely stable sliding characteristics, but when used in gas, that is, under unlubricated conditions, the sliding parts generate intense heat and the bearing This is because the parts are quickly damaged. Therefore, in conventional pivot shaft pumps and oblique shaft pumps, in order to protect the submersible bearings from operation under non-lubricated conditions at the time of startup, there are measures such as supplying lubricating oil to the sliding parts of the bearings or injecting water into the bearing parts. had been adopted.

This water injection device for the bearing portion will be explained with reference to FIGS. 1 and 2.

Fig. 1 is a vertical 1υr side view of a conventional spindle pump equipped with a device for injecting water into the bearing part, where l is the outside water level, and the impeller is at the level where it is submerged in water at this outside water level l. The spindle pump is installed as shown. The drive motor 3 is installed on the ground for easy maintenance and inspection, and the rotation of the actual motor 3 is transmitted to the shafts, t, and P via a shaft coupling, which is connected to the tip of the shaft. Rotate the impeller. Note that B is an intermediate shaft joint that connects the shafts j and j'. By the rotation of the impeller λ, water is drawn from the suction pel 7, passes through the discharge bowl, the hanging pipe 10, and is discharged from the discharge el yytt.
It is discharged from. lko, /3 is the axis! , P and the upper underwater bearing/4' and the lower underwater bearing l! This is a protective tube that guides lubricating water to the tank. Still, the upper underwater bearing l≠ is supported by the underwater bearing support lB, and the lower underwater bearing is supported by the ribs /7, /7/.

FIG. 2 is an enlarged sectional view of the upper submersible bearing /4' in part A of FIG. The shaft 3 is fixed by a.
The rubber bearing 1 is fixed to the underwater bearing support 1 with a slight gap from the outer peripheral surface of the sleeve 1'. In addition, this rubber bearing l? The inner circumferential shape of the horizontal cross section is circular, and usually
There are several vertical grooves for sliding water. Above rubber bearing
Riha, axis! , the axis j caused by the rotation of J+,
The radial runout of the sleeve 3' is limited by bringing the outer circumferential surface of the sleeve it into sliding contact with the inner circumferential surface of the rubber bearing 1.

When the chamber shaft pump shown in FIGS. 1 and 2 starts up and operates normally, the water injection row 20 provided at the top is
Then, water was poured between the shafts r and sr and the protection tubes /-2 and /J, and the two underwater bearings, 1 upper underwater bearing /4' and lower underwater bearing /J, were lubricated and protected with water. There is. However, in a spindle pump, the length of the shafts s and sr can reach several tens of meters, and in this case, many submersible bearings are used.
The shaft between them is protected by a stomach tube. Therefore, there is a drawback that a large amount of equipment cost is required to protect the underwater bearing when the pump is started. In addition, the above figures 1 and 2
Although the explanation in the figure relates to a chamber shaft and an IF pump, the same problem also occurred in a diagonal shaft pump.

It is an object of the present invention to eliminate the drawbacks of the prior art described above, to provide a submersible bearing that is used in both liquid and gas, and to have stable sliding characteristics under both usage conditions. To provide a submersible bearing that is easy to use, especially as a submersible bearing for a pivot shaft pump and a tilted shaft pump.
The submersible bearing part is placed in gas when the pump is started, so it can be started under non-lubricated conditions, and it shows good sliding characteristics even during steady operation after startup, and can only be used in fresh water. Another object of the present invention is to provide an underwater bearing that exhibits stable sliding characteristics even in a liquid with good conductivity such as seawater or in a slurry liquid.

In order to achieve this object, the present invention makes the rotating side member made of a cemented carbide containing tungsten carbide (WO), and the stationary side member made of silicon nitride (813N4) or silicon carbide (813N4).
They are each made of the ceramic of i0), and the ceramics are divided into segments and arranged and attached in an annular manner around the circumference (1) of the stationary side member.

Hereinafter, the present invention will be explained in detail with reference to Examples.

First, to explain the materials used for the rotating and stationary sides of submersible bearings, which is one of the features of the present invention. For example, combinations such as "thumb bearing - stainless steel shaft sleeve" or "carbon-containing Teflon (simplified name) bearing - stainless steel shaft sleeve" have excellent sliding characteristics in fresh water. However, it cannot be used at all under non-lubricated conditions, and [Carzen bearings or steel alloy bearings containing steel alloys - stainless steel shaft sleeves]
In this combination, when the underwater bearing part is immersed in a slurry liquid containing silica sand or alumina particles, the sliding surface is quickly damaged, and the result is not necessarily satisfactory.

Therefore, the present inventors used a testing device to examine the sliding characteristics of radial bearings and a bean dregs pump as shown in Figure V, which does not have a radial bearing. We investigated the sliding characteristics under various usage environments such as seawater conditions or seawater conditions containing slurry, and found that the above-mentioned monthly bearing used in the underwater bearing of the present invention is the most excellent. Table 1 shows the data obtained as a result of the sliding test.

Pk-8 Figure 3 is also a diagram showing the sliding properties of the bearing, with the horizontal axis representing the operating time and the vertical axis representing the coefficient of friction.

Sliding speed λ, j%/S, and surface pressure are rubber bearings - Stainless steel SUS 3o Hiro. 3 kgf/ca (
(represented by the symbol x), silicon nitride ceramic bearing - cemented carbide (Y O% WC) K) A C is A7 kg f/
67 kg f / cyA (present invention 2) and ≠ 2 kg f / c++! (λ' of the present invention), respectively.

As is clear from Table 7 and FIG. 3, the enclosed side member and fixed side member of the underwater bearing of the present invention are made of cemented carbide (particularly containing tungsten carbide) and silicon nitride ceramics or silicon carbide ceramics, respectively. The sliding behavior is extremely stable even in air, fresh water, and Sno 97L containing silica sand and alumina particles! 11Il
Characteristic? It can be seen that this is what is indicated.

Note that in the present invention, the nitride or silicon carbide ceramics constituting the fixed (111) member are easy to install and are used for sliding movement on the fixed side due to mechanical properties such as tensile strength, brittleness, and coefficient of linear expansion. Therefore, it is preferable to use it as the sliding member of the bearing 11, which is the fixed part, and it is preferable to use the other cemented carbide as the sliding member of the shaft side, which is the one-turn side member. desirable.

In addition, the cemented carbide used in the tests shown in Table 1 and Figure 3 is as follows.

It corresponds to JIS Hzrot aB3.

Tungsten carbide (WC) with Og '44 or higher
Cemented carbide alloys containing the same material have good and consistent sliding and f properties as shown in the table and Figure iA3.

Next, implementation 1+11 of the underwater bearing of the present invention using the above-mentioned bearing material]・)? ]l-% ≠ figure or iJ4 A
This will be explained with reference to Figure 0.

Fig. 7 is a vertical 1 analysis diagram when the conventional standing lino 1 pon f shown in Fig. 7 is used with the underwater #l + receiver of the present invention. g-/, z, /J, water inlet 20
The sweat device surface and lower submersible bearing/JF supporting rib 17, etc., which are not shown in the figure, were not provided because they were defective.
It has a rich FTF structure.

Moreover, the in-water bearings at the top and bottom parts/41. /, t.

You can see that it is extremely smaller than the conventional one.

The reason why the underwater bearing can be made smaller by using all the connections of the present invention as described above is as shown in Fig. 3. a
This is because it is possible to make Xiqin as small as 1 tian (1 tian) because it can produce 1 blood even in 1 tian (more than 70 times the size of rice).

Figure 45 is an enlarged sectional view of the submersible bearing part Q in part B of Figure j, and the shaft j'C' (is the shaft sleeve 2 made of cemented carbide made of tungsten carbide). The submersible bearing support 2 has a ceramic +iQn bearing 23 that is divided into segments attached to the underwater bearing support 2 through a metal case 22. !II 1'i &J has been done.

A piece of Tani ceramics divided into segments,
Metal case! One of the pieces formed in a circle of λ will be dazzled into the sleeping hole.The inner circumferential surface of the C ceramic piece will be in line contact with the outer circumferential surface of the shaft sleeve 2. It is installed so that it is in a similar state. Incidentally, this attachment is done by baking the surface or using a glue, and the valley ceramic piece is firmly fixed to the metal case 22.

Figures Aa to 6C are cross-sectional views along the line Vl-Vl in Figure g4j, where the valley segment piece supports the ttIC in water.
It is clearly shown that the metal case of 2.2 is arranged with 1 VC array in 11111 of 2.2.

That is, the figure shows an example in which each segment piece is composed of a curved circular rod-shaped body, 23a, and a circular segment piece, 23a, between these tlJi.
a is.

Gold, 4 cases, pre-marked on the inside of 22 +'i,'+'
tr: J that slides on the outer circumferential surface of the shaft sleeve 2/ within the arc-shaped shell through hole 2a that is spaced apart and drilled in the axial direction.
fli 'rj-'Y *I + remaining money・1. I'
r: It is damaged or cannot be fixed with adhesive.

Further, Fig. <b> shows an embodiment in which the valley segment piece is constituted by a rod-shaped body with a trapezoidal cross section, zJblx.

Each of these segment pieces 23b is 4? hA case 22
Among them, the rono [
Surrounding (dovetail) ifi hole! The same 7d is applied by 1tC sintering or adhesive in the glue b.

Similarly, the diagram shows an embodiment in which the valley segment pieces are made of rod-shaped bodies 2.3c with a rectangular cross section, and each of these segment pieces 2EC is spaced apart inside the metal case 2.2. A rectangular through hole with a rectangular surface of 11 is provided in the ql+ direction across the 15-jis 1liil+ sleeve, and the outer circumferential surface of the 15-jis 1liil+ sleeve is 2/. The tangential surface t is formed with an arcuate cross section.

According to the valley embodiments labeled 7J in these Figures 1a to 6C, iL is an underwater bearing support/, <VC metal case, 2. ! 7' Ceramics d
ll'll Uke 23 purple, divided into segments and gold kJi
Case 2. ! The circumferential surface of K J, L (arranged in the shape of V and J is 9
Since it is in the 1.1 digit, the lower 1 self has more effects and effects.

Since the contact between the ceramic piece and 111111 can be made in a state close to that of the line, the heat generation can be reduced during air operation. This was not possible with conventional bearing materials because the fused surface was small and the local rotation pressure was very small, and it was made possible for the first time with Hongenmei VC. Ta.

(This is because pumped water flows through the relatively wide gaps between the seven ceramic pieces, which are divided into segments.

Foreign matter in the handling liquid flows in the axial direction, reducing the amount of foreign matter caught in the sliding surface, and in combination with the previous bearing constituent material, the wear resistance is further improved.

011) When a ceramic bearing for a large shaft diameter is manufactured in one piece, the material is likely to be non-uniform, and the bearing is inevitably poor in 1D width, resulting in a large number of blanks, and as a result, it becomes commercially expensive. 71) By dividing the ceramic into segments as in the present invention, the ceramic itself can be small and can be applied to large shaft shafts. r F can be written.

In addition to the above-mentioned effects, in the unimplemented example shown in Figure 414Aa, each ceramic piece 23a is shaped into a cup-shaped body with a circular cross section, so it is easy to etch and is easy to manufacture.
``LJ'' is the easiest, and there is no fear that the valley ceramic pieces are radially inward and loose.Similarly, in the embodiment shown in Fig. 6b, each ceramic piece is placed in a dovetail hole with a face plate. Because of this, there is no risk of the ceramic pieces coming loose in the same direction, and since each of the broken ceramic pieces has a wide bottom surface, it has the effect of providing rounded support. In contrast to the above two examples, the ceramic piece has a shape that allows it to easily come off p;lf, but the contact layer t
This makes the soil easier to assemble (compared to the AB diagram when fixing with an ill).

The above describes an example in which the submersible bearing of a vertical shaft pump is applied to the submersible bearing of a vertical shaft pump.However, the same effect is achieved when applied to a diagonal shaft pump. Of course, you can also use it as a +In+father.

3/This is a bearing device for a rotating body supported by a rotating body, and it can also be used for underwater bearings used in liquids and bodies. 1
), ceramics are also dedicated to a fixed amount of qIlt+1lill in terms of purchase of 1,000 pachinko, etc.

Furthermore, 1 revolution + 11117jlf month? Of course, it is sufficient that the entire component is made of tungsten carbide.

As explained above, Ippon Taromei can be used underwater in liquids and gases! 1 rotation 11i1 in I'llll receiver
Made of carbide 8-karat gold made of one-piece ketungsten carbide.

The fixed elongated parts are each made of ceramics such as anodized silicon or layered silicon, and the ceramics are divided into segments and attached to the peripheral surface of the fixed side shrine in a root-like manner. Because I do.

With conventional submersible bearings, it is impossible to start with low smoothness, that is, even when starting in gas (igi !
Under conditions of injury, of course, ll@, silica sand-
Even when sliding in slurry water made of alumina particles, it maintains good sliding properties, so it is disease-free! & and fl
I't'iy condition is a condition in which the stock reversals -F or J4+3 is suitable for a glue that can be operated in an abrasive handling liquid, and it is very close. Since both ceramics have insulating properties, they are used to protect sliding parts that operate in liquids, so that they can be surrounded by corrosion-resistant parts. It also protects the material.Since it can also be used for high surface pressure loading, the entire ceramic can be divided into segments and the contact with @11 can be made as close as possible.

Fever when driving in the air? Since the gap between each divided ceramic piece can be used as a passage for foreign matter in the liquid being handled, the sliding surface is not only contaminated and the abrasion resistance is improved, but also the ceramic Since it is divided, it can be applied to doll bearings for each station, and there is no need to integrally mold it into ceramics, resulting in lower costs.

[Brief explanation of the drawing]

Figure 1 shows a conventional axle pump, )↓(11; li side view,
Figure 1 is an enlarged section of part A in Figure 1.
is a diagram showing the pulsation characteristics of the bearing, FIG. FIGS. Aa to 6C show different embodiments at the Vl--Vl line break 1 of FIG. j'...rotating shaft, /A...1ill support 21.
...Shaft sleeve, 23...Ceramics. , 2Ja, , 2Jb, 23c...ceramic pieces.

Claims (1)

[Claims] 1. In an underwater bearing used in liquid and gas, the rotating side member is made of a cemented carbide containing tungsten carbide (WO), and the stationary side member is made of silicon nitride 1t (SlaN).
n) or silicon carbide (Sin) ceramics, and is characterized in that the core ceramics are divided into segments and arranged and attached in an annular manner 1 m around the stationary side member. 2. In underwater bearings that are operated under non-lubricated conditions with the underwater bearing part placed in gas during startup and stop, the shaft part is made of cemented carbide coated with tungsten carbide, and the bearing side member is made of tungsten carbide. Each of the ceramics is made of silicon or silicon carbide, and the ceramics are divided into segments and arranged in an annular manner on the circumferential surface of the bearing side phase. :1' Submersible bearing described in J1. 3. The underwater bearing according to claim 1, wherein each ceramic piece divided into segments is formed to have a circular cross section. ≠ The underwater bearing according to claim 1, wherein each ceramic piece divided into segments is formed into a trapezoidal cross section. The underwater bearing according to claim 1, wherein each ceramic piece divided into segments is formed into a rectangular cross section.