CN220452503U

CN220452503U - Wear-resisting TC bearing

Info

Publication number: CN220452503U
Application number: CN202321438988.0U
Authority: CN
Inventors: 原国文; 原国明; 单薇宁; 原清华; 原泉; 原梦
Original assignee: Weifang Puqi Petroleum Machinery Co ltd
Current assignee: Weifang Puqi Petroleum Machinery Co ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2024-02-06
Anticipated expiration: 2033-06-07

Abstract

The utility model relates to the technical field of screw drilling tools, in particular to a wear-resistant TC bearing. The high-chromium cast iron bearing comprises a bearing moving coil, wherein a bearing static coil is sleeved outside the bearing moving coil, the bearing moving coil comprises a bearing moving steel body, and the outer surface of the bearing moving steel body is connected with the inner surface of cylindrical high-chromium cast iron; the bearing static ring comprises a bearing static steel body, wherein the inner surface of the bearing static steel body is connected with hard alloy, and the hard alloy is sleeved on the outer surface of the cylindrical high-chromium cast iron. The hard alloy on the outer wall of the bearing moving coil is replaced by high-chromium cast iron, so that the friction layer of the TC bearing is friction between the hard alloy and the high-chromium cast iron, the high-chromium cast iron can meet the hardness requirement of the TC bearing, and compared with the hard alloy, the hard alloy is small in hardness.

Description

Wear-resisting TC bearing

Technical Field

The utility model relates to the technical field of screw drilling tools, in particular to a wear-resistant TC bearing.

Background

Screw drilling tools are one of the most widely used downhole power tools in petroleum drilling. TC bearings are located in the drive section thereof and are critical components affecting the life of the screw drilling tool. The TC bearing is divided into an inner bearing sleeve and an outer bearing sleeve, which are also called a bearing moving ring and a bearing static ring; the inner shaft sleeve is matched with the transmission shaft and locked, the outer shaft sleeve is assembled with the casing of the underground power drilling tool, the inner shaft sleeve and the casing of the underground power drilling tool are matched to form a working surface, and the main function of the inner shaft sleeve is to transmit the torque and the rotating speed of the motor to the drill bit. During operation, the TC bearing is subjected to axial and radial forces of the universal bearing and the drill bit, and the inner hub tends to move eccentrically about the outer hub.

In the prior art, the outer wall of the bearing moving ring of the TC bearing and the inner wall of the bearing static ring are connected by hard alloy, namely the friction layer of the TC bearing is mainly the friction between the hard alloy and the hard alloy.

The prior art solutions described above have the following drawbacks: the friction coefficient between the hard alloy and the hard alloy is large, so that the friction force born by the hard alloy is large when the screw drilling tool is used, and the abrasion is rapid.

Disclosure of Invention

In view of the above-mentioned drawbacks, the present utility model provides a wear-resistant TC bearing, which aims to reduce friction loss by reducing the friction coefficient of the friction layer, thereby improving the service life of the TC bearing.

The utility model is realized by using the following technical scheme: the wear-resistant TC bearing comprises a bearing moving coil, wherein a bearing static coil is sleeved outside the bearing moving coil, the bearing moving coil comprises a bearing moving steel body, and the outer surface of the bearing moving steel body is connected with the inner surface of cylindrical high-chromium cast iron; the bearing static ring comprises a bearing static steel body, wherein the inner surface of the bearing static steel body is connected with hard alloy, and the hard alloy is sleeved on the outer surface of the cylindrical high-chromium cast iron.

Further, the cylindrical high-chromium cast iron is sleeved on the outer surface of the bearing movable steel body.

Further, the hardness of the high-chromium cast iron is 50HRC-60HRC, and the friction coefficient is 0.6.

Further, the cylindrical high-chromium cast iron is in interference fit with the bearing movable steel body.

Further, the inner surface of the cylindrical high-chromium cast iron is frosted.

Further, the outer surface of the bearing moving steel body is frosted at the contact part with the cylindrical high-chromium cast iron.

Further, the hard alloy is provided with a plurality of hard alloy blocks, and the hard alloy blocks are uniformly arranged on the inner surface of the bearing static steel body.

The utility model has the following technical effects:

the wear-resistant TC bearing is different from the prior art in that the hard alloy on the outer wall of the bearing moving coil is replaced by the high-chromium cast iron, so that the friction layer of the TC bearing is friction between the hard alloy and the high-chromium cast iron, the high-chromium cast iron can meet the hardness requirement of the TC bearing, and compared with the hard alloy, the hardness is small, in addition, the friction coefficient of the friction layer is reduced, the friction loss of the friction layer is reduced, and the service life of the TC bearing is prolonged.

A wear resistant TC bearing according to the present utility model is further described below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of a wear resistant TC bearing construction;

FIG. 2 is an isometric view of a bearing moving coil;

fig. 3 is an isometric view of a bearing stator ring.

In the figure: 1-bearing moving coil, 11-bearing moving steel body, 12-high chromium cast iron; 2-bearing static ring, 21-bearing static steel body and 22-hard alloy.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific examples described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1, the wear-resistant TC bearing comprises a bearing moving coil 1 and a bearing static coil 2, wherein the bearing static coil 2 is sleeved on the outer surface of the bearing moving coil 1, the bearing moving coil 1 is matched with a transmission shaft of a screw drilling tool and locked, the bearing static coil 2 is matched with a casing of the underground power drilling tool in a rotating way, a working surface is formed by the matching of the bearing moving coil 1 and the bearing static coil 2, and the main function is that the torque and the rotating speed of a motor are transmitted to a drill bit. During operation, the TC bearing is subjected to axial and radial forces from the universal bearing and the drill bit, and the inner hub tends to move eccentrically about the outer hub. The normal failure mode of the TC bearing is that the friction layer is eroded by sand-containing well fluid for a long time and the friction layer is worn, so the TC bearing has certain requirements on wear resistance and corrosion resistance.

As shown in fig. 2, the bearing moving coil 1 of the TC bearing comprises a bearing moving steel body 11, the outer surface of the bearing moving steel body 11 is sleeved with high-chromium cast iron 12, the high-chromium cast iron 12 is firstly manufactured into a cylinder shape when being processed, the diameter of the inner circle of the cylinder-shaped high-chromium cast iron 12 is smaller than that of the outer circle of the bearing moving steel body 11, then the cylinder-shaped high-chromium cast iron 12 is heated, the cylinder-shaped high-chromium cast iron 12 is expanded, then the high-chromium cast iron 12 can be sleeved on the bearing moving steel body 11, and then the cylinder-shaped high-chromium cast iron 12 is contracted when being cooled, so that the effect that the high-chromium cast iron 12 is firmly fixed on the bearing moving steel body 11 is achieved.

As a further explanation of this example, in which the inner surface of the above-mentioned cylindrical high-chromium cast iron 12 is frosted, the portion of the outer surface of the bearing movable steel body 11 in contact with the cylindrical high-chromium cast iron 12 is also frosted, and the degree of firmness of the cylindrical high-chromium cast iron 12 and the bearing movable steel body 11 is further increased by increasing the roughness of the friction surface between the cylindrical high-chromium cast iron 12 and the bearing movable steel body 11. Since the diameter of the outer ring of the bearing moving steel body 11 is larger than the diameter of the inner ring of the cylindrical high-chromium cast iron 12, the cylindrical high-chromium cast iron 12 is heat treated to be put on the bearing moving steel body 11, the cylindrical high-chromium cast iron 12 is heated to a temperature between 600 ℃ and 700 ℃, the cylindrical high-chromium cast iron 12 expands at this temperature, so that the cylindrical high-chromium cast iron 12 can be put on the bearing moving steel body 11, and the cylindrical high-chromium cast iron 12 gradually returns to its original shape, i.e., contracts from the expanded state and gradually returns to its original shape, but since the cylindrical high-chromium cast iron 12 is put on the bearing moving steel body 11 and the diameter of the inner ring thereof is smaller than the diameter of the outer ring of the bearing moving steel body 11, the cylindrical high-chromium cast iron 12 is fixed, and the heat generated in the operation of the TC bearing is up to about 120 ℃ without affecting the high-chromium cast iron 12. Wherein the hardness of the high-chromium cast iron 12 is between 50HRC and 60HRC, and the friction coefficient is 0.6.

As shown in fig. 3, the bearing static ring 2 of the TC bearing includes a bearing static steel body 21, and a plurality of cemented carbides 22 uniformly arranged are connected to the inner surface of the bearing static steel body 21, and the bearing static ring 2 is in the prior art and will not be described in detail herein.

As a further explanation of this embodiment, the bearing stator 2 is sleeved on the outer surface of the bearing rotor 1, the further cemented carbide 22 is sleeved on the outer surface of the cylindrical high-chromium cast iron 12 to form a friction layer, the cylindrical high-chromium cast iron 12 and the cemented carbide 22 are soft and hard, so that the wear resistance of the friction layer can be increased, and in addition, the friction coefficient of the friction layer is reduced due to the relatively smaller friction coefficient of the cylindrical high-chromium cast iron 12, so that the stress of the friction layer is reduced.

In summary, in this example, the hard alloy 22 of the bearing moving coil 1 in the prior art is replaced by the cylindrical high-chromium cast iron 12 with the friction coefficient and hardness smaller than those of the hard alloy 22, so that the friction loss of the friction layer is reduced, and the service life of the TC bearing is further prolonged. In addition, when the cylindrical high-chromium cast iron 12 is severely worn and needs to be replaced, the cylindrical high-chromium cast iron 12 can be expanded and falls off through the heat treatment, and only the new cylindrical high-chromium cast iron 12 needs to be replaced, and the whole bearing moving coil 1 does not need to be replaced, so that the cost is saved.

Of course, the present utility model is capable of other various embodiments and its several details are capable of modification and variation in light of the present utility model, as will be apparent to those skilled in the art, without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. The wear-resistant TC bearing is characterized by comprising a bearing moving coil (1), wherein a bearing static coil (2) is sleeved outside the bearing moving coil (1), the bearing moving coil (1) comprises a bearing moving steel body (11), and the outer surface of the bearing moving steel body (11) is connected with the inner surface of a cylindrical high-chromium cast iron (12); the bearing static ring (2) comprises a bearing static steel body (21), wherein the inner surface of the bearing static steel body (21) is connected with a hard alloy (22), and the hard alloy (22) is sleeved on the outer surface of the cylindrical high-chromium cast iron (12).

2. The wear-resistant TC bearing according to claim 1, characterized in that said cylindrical high chromium cast iron (12) is sleeved on the outer surface of said bearing moving steel body (11).

3. The wear resistant TC bearing according to claim 2, wherein said high chromium cast iron (12) has a hardness of 50HRC-60HRC and a coefficient of friction of 0.6.

4. A wear resistant TC bearing according to claim 3, characterised in that said cylindrical high chromium cast iron (12) is in interference fit with said bearing moving steel body (11).

5. The wear resistant TC bearing of claim 4, wherein an inner surface of said cylindrical high chromium cast iron (12) is frosted.

6. The wear-resistant TC bearing according to claim 5, characterized in that a portion of an outer surface of said bearing moving steel body (11) in contact with said cylindrical high-chromium cast iron (12) is frosted.

7. The wear resistant TC bearing according to claim 1, characterized in that said cemented carbide (22) has a number of pieces, said number of pieces of cemented carbide (22) being uniformly arranged on the inner surface of said bearing static steel body (21).