Long-life bearing for low-temperature pump

Abstract

The utility model discloses a long-life bearing for a low-temperature pump. The long-life bearing comprises an outer ring, a retainer, an inner ring and a rolling body, the inner circular surface of the outer ring is provided with a raceway matched with the rolling body, and the rolling body is in contact with the outer circular surface of the inner ring; the retainer is in rolling fit with the inner circle face of the outer ring and the outer circle face of the inner ring, the upper end and the lower end of one side of the retainer are each provided with an annular protrusion, the outer circle face of the inner ring is provided with an annular groove matched with the annular protrusion, the inner circle face of the outer ring is provided with an open annular groove matched with the annular protrusion, and the open annular groove penetrates and extends to a roller path of the outer ring. The annular protrusions are arranged at the upper end and the lower end of one side of the retainer, the annular protrusions are correspondingly matched with the outer ring and the inner ring, the rolling bodies can be positioned, arrangement of a traditional inner ring raceway is reduced, machining and special process treatment of the raceway are not needed, abrasion of the traditional raceway is reduced, and the service life is prolonged. In addition, the retainer and the rolling body support the outer ring and the inner ring simultaneously, so that complex operation conditions can be met, and stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing technical field, concretely is a long life bearing for cryogenic pump. BACKGROUND

[0002] The cryogenic pump is widely used in the super low temperature medium conveying system of liquefied natural gas, liquid nitrogen, liquid oxygen and the like, and its operating environment has the characteristics of extremely low temperature, volatile medium and high sealing requirement. As one of the key components, the bearing plays an important role in supporting the rotor, bearing load and ensuring the stable operation of the shafting in the cryogenic pump.

[0003] The traditional rolling bearing often has the problems of short service life, unstable operation and frequent maintenance. In the traditional structure, the rolling elements are usually arranged at intervals by the retainer and roll with the raceways of the inner ring and the outer ring. However, in this structure, the raceway surface needs to be subjected to complex machining and heat treatment process to meet the wear resistance and hardness requirements, which not only increases the manufacturing cost, but also easily leads to bearing failure due to raceway wear during long-term use, thereby affecting the performance of the whole machine. In order to improve the stability and durability of the bearing, some existing technologies try to improve the retainer structure or use new materials, but these improvements have not fundamentally solved the problem of raceway wear, and the overall reliability and maintainability of the bearing under extreme working conditions have not been fully considered. Therefore, there is an urgent need for a bearing structure that is optimized in structure, easy to install and disassemble, suitable for complex working conditions and has a long service life to meet the application requirements of special equipment such as cryogenic pumps. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art, provide a long life bearing for cryogenic pump, reduce the wear of the traditional raceway, improve the service life, meet the complex operating conditions, improve the operating stability, and effectively solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a long life bearing for cryogenic pump, comprising an outer ring, a retainer, an inner ring and rolling elements; the inner circular surface of the outer ring is provided with a raceway adapted to the rolling elements, and the rolling elements are in contact with the outer circular surface of the inner ring; the retainer is in rolling contact with the inner circular surface of the outer ring and the outer circular surface of the inner ring, and the retainer is provided with annular protrusions on the upper and lower ends of one side; the outer circular surface of the inner ring is provided with an annular groove adapted to the annular protrusions; the inner circular surface of the outer ring is provided with an open annular groove adapted to the annular protrusions, and the open annular groove extends through the raceway of the outer ring.

[0006] Preferably, the open annular groove is arranged on the narrow section of the inner circular surface of the outer ring.

[0007] Preferably, one end of the inner ring protrudes from the outer ring, and the outer edge of the protruding end is provided with a drawing groove.

[0008] Preferably, the rolling elements are ceramic balls, and the rolling elements are rollingly mounted in the pockets of the cage.

[0009] Preferably, the cross section of the annular protrusion is semicircular.

[0010] Compared with the prior art, the utility model has the beneficial effects that: the annular protrusion is arranged on the upper and lower ends of one side of the cage, the annular protrusion is correspondingly matched with the outer ring and the inner ring, the rolling elements can be positioned, the setting of the traditional inner ring raceway is reduced, the raceway special process treatment is not needed, the traditional raceway wear is reduced, the service life is improved, in addition, the cage and the rolling elements support the outer ring and the inner ring simultaneously, complex operation conditions can be met, and the stability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 It is a structural schematic view of the utility model;

[0012] Fig. 2 It is a sectional view of the utility model;

[0013] Fig. 3 It is a local structure enlarged schematic view of the utility model.

[0014] In the drawing: 1 outer ring, 1.1 open ring groove, 2 cage, 2.1 annular protrusion, 3 inner ring, 3.1 drawing groove, 4 rolling element. DETAILED DESCRIPTION

[0015] The utility model can be explained in detail through the following examples, the purpose of the utility model is to protect all technical improvements within the scope of the utility model, and in the description of the utility model, it should be understood that, if the orientation or position relationship indicated by terms such as "upper", "lower", "front", "rear", "left" and "right" is only corresponding to the drawings of the application, in order to facilitate the description of the utility model, and not indicate or imply that the indicated device or element must have a particular orientation.

[0016] Please refer to Figs. 1-3 The utility model provides the following technical scheme:

[0017] Example 1: a long-life bearing for a cryogenic pump, comprising an outer ring 1, a cage 2, an inner ring 3 and a rolling element 4; the inner circular surface of the outer ring 1 is provided with a raceway matched with the rolling element 4, and the rolling element 4 is in contact with the outer circular surface of the inner ring 3; the cage 2 is rollingly matched with the inner circular surface of the outer ring 1 and the outer circular surface of the inner ring 3, one side of the cage 2 is provided with annular protrusions 2.1 on the upper and lower ends, the outer circular surface of the inner ring 3 is provided with annular grooves matched with the annular protrusions 2.1, and the inner circular surface of the outer ring 1 is provided with open ring grooves 1.1 matched with the annular protrusions 2.1, and the open ring grooves 1.1 extend through to the raceway of the outer ring 1;

[0018] It can be understood that the upper and lower ends of one side of the retainer 2 are provided with annular protrusions 2.1, which are matched with the outer ring 1 and the inner ring 2, can position the rolling body 4, reduce the setting of the traditional inner ring 3 raceway, do not need to be processed and special process treatment to the raceway, reduce the wear of the traditional raceway, improve the service life, in addition, the retainer 2 and the rolling body 4 support the outer ring 1 and the inner ring 3 at the same time, can meet the complex operating conditions, improve the operation stability; the open ring groove 1.1 is straight through the raceway of the outer ring 1, which is convenient to withdraw.

[0019] It should be noted that the open ring groove 1.1 is arranged on the inner circular surface narrow section of the outer ring 1.

[0020] Embodiment 2: Different from embodiment 1, one end of the inner ring 3 protrudes from the outer ring 1, and the outer edge of the protruding end is provided with a drawing groove 3.1, which facilitates the pulling out of the inner ring 3 and is convenient to operate.

[0021] Embodiment 3: Different from embodiment 1, the rolling body 4 is a ceramic ball, and the rolling body 4 is rollingly installed in the pocket of the retainer 2; the cross section of the annular protrusion 2.1 is semicircular.

[0022] The part not described in the utility model is the prior art, for those skilled in the art, obviously, the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and all changes falling within the meaning and scope of equivalent elements are intended to be included in the content of the utility model.

Claims

1. A long-life bearing for a cryogenic pump, comprising an outer ring (1), a cage (2), an inner ring (3) and rolling elements (4); characterized in that: The inner circular surface of the outer ring (1) is provided with a raceway matched with the rolling body (4), and the rolling body (4) is in contact with the outer circular surface of the inner ring (3); the retainer (2) is in rolling fit with the inner circular surface of the outer ring (1) and the outer circular surface of the inner ring (3), and the retainer (2) is provided with annular protrusions (2.1) on the upper and lower ends of one side; the outer circular surface of the inner ring (3) is provided with annular grooves matched with the annular protrusions (2.1), and the inner circular surface of the outer ring (1) is provided with open annular grooves (1.1) matched with the annular protrusions (2.1), and the open annular grooves (1.1) extend through the raceway of the outer ring (1).

2. A long-life bearing for a cryopump as defined in claim 1, characterized in that: The open annular groove (1.1) is arranged on the narrow section of the inner circular surface of the outer ring (1).

3. A long-life bearing for a cryopump as defined in claim 1, characterized in that: One end of the inner ring (3) protrudes from the outer ring (1), and the outer edge of the protruding end is provided with a pulling groove (3.1).

4. A long-life bearing for a cryopump as defined in claim 1, characterized in that: The rolling body (4) is a ceramic ball, and the rolling body (4) is rollingly installed in the pocket of the retainer (2).

5. A long-life bearing for a cryopump as defined in claim 1, characterized in that: The cross section of the annular protrusion (2.1) is semicircular.

Images