JPS58160625A - Sliding unit of pump - Google Patents

Abstract

PURPOSE:To improve corrosion resistance, wear resistance, and seizure resistance oven in sea water including manganese slurry by using ceramics at one side and LAVES alloy at the other side of sliding members that slide with each other. CONSTITUTION:For either a casing side of a pump whose working fluid is slurry-mixed sea water or a sliding part which is situated between the nonrotating member fixed to the casing and rotating member such as impellers and is intruded by slurry-mixed sea water, a sliding member consisting of metal such as molybdenun, chromium, silicon, and cobalt at well as another sliding member that slides with the said sliding member and consists of ceramics such as Sic and Si3N4 are provided. With this contrivance, contact corrosion between a casing and impellers can be eliminated, and clearance corrosion between sliding parts during the non-operating period of a pump can also be prevented.

Description

[Detailed Description of the Invention] This IAf! A relates to a sliding member that is used in a liquid and for which no anti-friction agent can be used on the sliding surface of the sliding part, particularly a pump O sliding member that is used in seawater.

Hiro carbon and copper-based sintered materials are used in pumps that handle fresh water and oil fat, but if they are used with slurry or -0, they will wear out and cannot be used. The reality is that pumps that handle corrosive liquids such as seawater and seawater use stainless steel and BO materials with large gaps between the sliding parts to prevent seizures (this results in a large amount of leakage). ), which has the disadvantage of lower pump efficiency) 0 In addition, recent efforts have been made to collect marine JlO manganese nodules, but it is necessary to collect corrosive seawater mixed with ζO field slurry.
Items handled by IL Casing ring, impeller ring O
In addition to the sliding parts, the biggest problem is the combination of shaft seals.

Slurry is #10. If the diameter of the bearing gap is 0.4, the slurry will enter most of the bearing gap. This shaft seal part can be
I) OTM* is required as a bearing that has a small clearance on the sliding part and can also support the load at the ζ0 part. As a matter of fact, there is currently no such arrangement.The object of the present invention is to provide a sliding device suitable for sliding members in a seawater environment, such as liner rings in pumps and shaft sealing members.

In the present invention, one of the two sliding members K Mo , Or, I
A corrosion-resistant and wear-resistant material consisting of li and 00 or N1,
On the other hand, a ceramic material such as 810 or l1ijN4 is used.

Suitable materials for sliding parts used in seawater drawstrings include a low coefficient of friction, good wear resistance, no seizure even if slurry is mixed in, and resistance to potential difference corrosion and crevice corrosion. be. The inventors used the testing device shown in FIG. 1 to compare the results with a conventional combined sliding material. FIG. 1 is a longitudinal sectional view of the sliding testing device. In the figure, a shaft J is rotated by a hydraulic motor l via a torque meter 1, and a sleeve-shaped test piece S is fitted and fixed on the shaft s@i. When the ring-shaped test piece 4 is inserted into the bearing housing 4, the radial load applied in the direction of the arrow 4L/70 is applied to the holding member l of the bearing house 7 through the load cell t'Ik and the end of the ring. It can be conveyed to No. A hose 7, through which liquid is fed, is disposed on the bearing hub as indicated by the arrow in the figure. /411 is a rotating needle that determines the number of rotations of the axis J□.

The bearing house 7, the load cell t, the bearing house holding member //, the hose s, etc. on the side supporting the ring-shaped test piece 6 are supported by the test tank isz, and the test tank /j is vertically moved) It is supported by Vit. Therefore, the ring-shaped test piece 4 moves up and down, and the sleeve-shaped test piece j rotates, so that the liquid is sent into the bearing gap between them.

He invented this testing machine and a sliding member suitable for seawater containing manganese slurry, which will be described later.

In the present invention, one of the sliding members that slide on each other is made of ceramic 9B.
10, 81. ) I, etc., and the sliding member that slides against the ceramic O1m moving member is (a) at least nickel (cobal) with a weight of at least 100%, (b) molybdenum with a weight of xo-octopus, (C) (
When a) is cobalt, d/ri~J! The weight of chromium and (a) the weight of nickel is t-21 the weight of chromium and ((1) (1) the microstructure of the alloy is mainly raves (Iav・rephase). OII Isao to 10
(2) a Raves phase consisting of silicon in an amount sufficient such that the microstructure of the alloy consists of a Raves phase of at least 71% by weight; An alloy with (q/# public N
j4-da/41 is hereinafter simply referred to as Raves phase alloy).

#I/When the test is carried out using the rotating friction tester shown in the figure, Mo,
It has been found that the friction coefficient of the L-base or Fioo-base material, which has a raves phase consisting of Or, 81, decreases significantly when MaOJ is mixed. For example, when the mating material is stainless steel, the friction coefficient is 0, and from Octopus to 0. /J
decreases to However, if slurry is mixed in, ζonto
Even with combinations of materials, a tendency toward seizure appears under high loads. It was found that when ceramic was used as the partner material for the Eve phase alloy in seawater mixed with this slurry, the burning phenomenon completely disappeared, and it exhibited good friction resistance and wear characteristics.

For example, “s”* is pressure-pressure sintered to the counterpart material of Raves phase alloy.
If # is used, 0.1% 810. The coefficient of friction in seawater is 0. Figure 1 shows a comparison with the results for conventionally used sliding members. In Figure 1, the test time is shown on the horizontal axis, and when the test time has decreased by 3j, fresh water is supplied by 3j.
- Na0j There is also O″r! when changed to water.

As shown in 11JII, it is shown that the coefficient of friction can be extremely lowered in seawater even when the material combination lζ is in fresh water. In Figure 1, no manganese slurry is mixed, so this effect is less likely to affect the sliding member. This effect is believed to be due to the combination of wood types, seawater, or components in the seawater.These effects were first clarified by the inventors.
Next, when we look at the slurry mixed with seawater, it is as shown in Table 1. , 1itio sintered under normal pressure and one of the Raves phase alloys, known as Tribaloy 〒t00 (product 4). (grains a max. 0.7) was tested, and the friction coefficient remained unchanged compared to just seawater. When looking at ceramic versus ceramic, the friction coefficient did not change between fresh water and seawater. If seawater is mixed with slurry, the coefficient of friction will increase.Next, stainless steel BUBJI 4 vs. ceramic fii
, II, , When looking at one 810r, there is a difference between fresh water and seawater (the friction coefficient increases in slurry-containing seawater). The coefficient of friction increases in seawater mixed with slurry (more than 0).As is clear, the combination of Raves Sokaikin and ceramics causes a significant decrease in the coefficient of friction in seawater (even in clean water), and manganese Even in seawater mixed with slurry, the coefficient of friction is the same as in seawater. On the other hand, in the case of a sliding member that combines other O# species that have been improved, the coefficient of friction is unchanged in fresh water and seawater, but the coefficient of friction increases in O seawater mixed with manganese slurry.

2nd II Hiro slurry pumped into seawater g: A combination of various sliding members O indicates the sliding characteristics.
O Seizure resistance, expressed as distance (m) x load (kgf), ranges from low seizing frequency to high to OK, 6%, no seizing at all, and jV & numerical competition - 1 Large degree of seizing steel. The one with the same excellent corrosion resistance as O and 1 is I, and the one with the worst O is 3, and the O arranged in between is
Although a wide variety of sliding members were tested, the following are representative ones: The Raves phase alloy V8 ceramic has the best wear resistance. i.e. for ceramic-to-ceramic combinations.
The seizure resistance is excellent (Redict), and there was no seizure during the test, and the same is true for ceramic vs. ceramic. Between similar metals OW# poor castability Ctoha14knowledget)Ctochi&), R#j/41
8 peel tlJI4 is the worst. □ The gap between the sliding parts is 1''t'll.) In the Raves phase alloy V8 ceramic, it is possible to have a straight bullet of 40 and the diameter is 4Qμt. It has been found that when the angle is lower than the second level, the size of the hooked sea bream becomes larger.

When it comes to ceramic versus ceramic, it is difficult to minimize the bearing clearance during manufacturing. In terms of corrosion resistance, Raves Sogankin V8 Ceramic is one of the best. ~ As a result of the above, in order to use it in sea ice containing manganese slurry, it must have excellent corrosion resistance, and stainless steel vs. stainless steel. Combinations of stellite to stellite cannot be used; stainless steel to gunmetal, stainless steel to ceramic, ceramic to ceramic, and raves to ceramic can be used (for corrosion resistance).

Once we were satisfied with the corrosion resistance, we then looked at the seizure resistance and found that stainless steel versus ceramic could be used. Next, from the viewpoint of wear resistance, the combination of ceramic and gunmetal is not satisfactory due to its durability.Then, the residual O becomes ceramic to ceramic and ceramic to Raves phase alloy.However, the coefficient of friction is ♂We have shown that the IBS phase alloy vs. ceramic is extremely superior), and the bearing gap is small (0 or more).We have specifically developed the proposed @O combination sliding member for a pump that pumps seawater containing manganese slurry. By using a sliding device that uses the original @O1 combination sliding member, we obtained the following effects. By applying it to the impeller ring, it has become possible to reduce this Ichinoseki to less than the conventional 0/lo (in other words, it has been possible to increase pump efficiency). In addition, it was possible to completely prevent crevice corrosion between the sliding parts when the pump stopped operating. It is possible to develop a pump that is sufficiently durable by applying materials such as a 1knt shaft seal part, and a bearing plate that also holds the load by applying the same function. , it has become possible to develop a 6-axis seal part O. Compared to conventional O sliding members, the coefficient of friction is '/J.

1k), power O was reduced, and energy was saved.

A simple explanation - Figure 1 is a longitudinal sectional view of the one-turn friction tester O, and Figure 1 is a line between lines showing the friction characteristics of the assembled sliding member related to the present invention.

I... Sleeve-shaped test piece 1... Ring-shaped test piece Patent applicant: Ebara Corporation Daihojin Part Arai Figure 2 IIζ cavity clearing and closing (minl

Claims (1)

[Claims] l Molybdenum, chromium, , metal material O made of silicon and cobalt slides against sliding surface member and # sliding surface member! 10, 81. Mf-f'tD sliding device comprising a sliding surface member made of ceramic material such as )f, etc.