CN117167187A

CN117167187A - Nuclear power plant upper filling pump oil loop hydraulic motor

Info

Publication number: CN117167187A
Application number: CN202310993408.2A
Authority: CN
Inventors: 陈强; 许德忠; 于博; 姚正军; 刘星; 青晨; 车银辉
Original assignee: CGN Power Co Ltd; Suzhou Nuclear Power Research Institute Co Ltd; China Nuclear Power Operation Co Ltd
Current assignee: CGN Power Co Ltd; Suzhou Nuclear Power Research Institute Co Ltd; China Nuclear Power Operation Co Ltd
Priority date: 2023-08-08
Filing date: 2023-08-08
Publication date: 2023-12-05

Abstract

The invention discloses a hydraulic motor of an upper charge pump oil loop of a nuclear power plant, which comprises a shell, a first gear shaft, a second gear shaft and an output shaft; the first gear shaft and the second gear shaft are arranged in the shell, the second end of the output shaft is arranged in the shell, and the first end of the output shaft extends out of the shell; the first end of the first gear shaft is provided with an external spline, the second end of the output shaft is provided with an internal spline, and the external spline and the internal spline are mutually matched; the first gear shaft is provided with a first through groove which penetrates through the two axial ends of the first gear shaft, the second gear shaft is provided with a second through groove which penetrates through the two axial ends of the second gear shaft, the first through groove and the second through groove are communicated with an oil way in the shell, so that oil in the shell can enter into the outer spline and the inner spline part through the first through groove and the second through groove in a low-pressure state, the inner spline and the outer spline are subjected to full-oil lubrication, the abrasion coefficient is reduced, the micro-motion abrasion angle is isolated, and the service life of a hydraulic motor of an oil filling and pumping loop on the nuclear power plant is prolonged.

Description

Nuclear power plant upper filling pump oil loop hydraulic motor

Technical Field

The invention relates to the technical field of nuclear power, in particular to a hydraulic motor of an upper oil filling and pumping loop of a nuclear power plant.

Background

The hydraulic motor of the oil filling and pumping loop of the nuclear power plant is used for driving the cooler to reduce the temperature of lubricating oil of the lubricating loop. But the internal spline wear failure problem often occurs during actual operation. The inspection finds that the internal lubrication of the spline is poor, the full oil lubrication cannot be formed only by means of oil seepage from the part of the gear shaft sleeve, and the eccentric spline is overlapped under the poor lubrication condition to frequently wear.

Disclosure of Invention

The invention aims to solve the technical problem of providing a hydraulic motor of an upper charge pump oil loop of a nuclear power plant.

The technical scheme adopted for solving the technical problems is as follows: the hydraulic motor of the upper oil filling and pumping loop of the nuclear power plant is constructed, and the hydraulic motor comprises a shell, a first gear shaft, a second gear shaft and an output shaft;

the first gear shaft and the second gear shaft are installed in the shell, the second end of the output shaft is installed in the shell, and the first end of the output shaft extends out of the shell;

an external spline is arranged at the first end of the first gear shaft, an internal spline is arranged at the second end of the output shaft, and the external spline is matched with the internal spline;

the first gear shaft is provided with a first through groove penetrating through two axial ends of the first gear shaft, the second gear shaft is provided with a second through groove penetrating through two axial ends of the second gear shaft, and the first through groove and the second through groove are communicated with an oil way in the shell.

In some embodiments, the housing comprises a hollow shell, a first end cap, and a second end cap; the first end cover and the second end cover are respectively arranged at two axial ends of the hollow shell; the output shaft is arranged in the first end cover;

the first gear shaft and the second gear shaft are arranged in the hollow shell, and a first oil hole and a second oil hole are respectively formed in two opposite sides of the hollow shell in the circumferential direction;

the first oil hole, the inner cavity of the hollow shell and the second oil hole are matched with each other to form the oil circuit.

In some embodiments, the first end cap is provided with a first cavity, a second cavity, and a first channel through which the first cavity and the second cavity communicate; the second end cover is provided with a third cavity, a fourth cavity and a second channel, and the third cavity is communicated with the inner cavity of the hollow shell through the second channel;

the first end of the first gear shaft extends into the first cavity, and the two axial ends of the first through groove are respectively communicated with the first cavity and the third cavity; and two ends of the second through groove are respectively communicated with the second cavity and the fourth cavity.

In some embodiments, the fourth cavity extends through the second end cap.

In some embodiments, the first gear shaft includes a first shaft body, and a first gear part is provided at a middle part of the first shaft body;

the second gear shaft comprises a second shaft body, and a second gear part is arranged in the middle of the second shaft body; the first gear portion intermeshes with the second gear portion.

In some embodiments, the nuclear power plant on-board pump oil circuit hydraulic motor further comprises a first sleeve and a second sleeve;

the first end of the first shaft body and the first end of the second shaft body are both installed in the first shaft sleeve, and the second end of the second shaft body are both installed in the second shaft sleeve.

In some embodiments, a first seal ring is fitted between the first sleeve and the first end cap;

a second sealing ring is matched between the second sleeve and the second end cover.

In some embodiments, the housing further comprises an outer cavity connected to a side of the first end cap facing away from the second end cap;

the outer cavity is provided with an installation cavity, the second end of the output shaft is installed in the installation cavity, and the first end of the output shaft penetrates through the outer cavity.

In some embodiments, a bearing is disposed in the mounting cavity, and the bearing is sleeved on a part of the periphery of the output shaft.

In some embodiments, the first through slot and the second through slot are both circular slots.

The implementation of the invention has the following beneficial effects: the hydraulic motor of the upper oil filling and pumping loop of the nuclear power plant comprises a shell, a first gear shaft, a second gear shaft and an output shaft; the first gear shaft and the second gear shaft are arranged in the shell, the second end of the output shaft is arranged in the shell, and the first end of the output shaft extends out of the shell; the first end of the first gear shaft is provided with an external spline, the second end of the output shaft is provided with an internal spline, and the external spline and the internal spline are mutually matched; the first gear shaft is provided with a first through groove which penetrates through the two axial ends of the first gear shaft, the second gear shaft is provided with a second through groove which penetrates through the two axial ends of the second gear shaft, the first through groove and the second through groove are communicated with an oil way in the shell, so that oil in the shell can enter into the outer spline and the inner spline part through the first through groove and the second through groove in a low-pressure state, the inner spline and the outer spline are subjected to full-oil lubrication, the abrasion coefficient is reduced, the micro-motion abrasion angle is isolated, and the service life of a hydraulic motor of an oil filling and pumping loop on the nuclear power plant is prolonged.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the following description will be given with reference to the accompanying drawings and examples, it being understood that the following drawings only illustrate some examples of the present invention and should not be construed as limiting the scope, and that other related drawings can be obtained from these drawings by those skilled in the art without the inventive effort. In the accompanying drawings:

FIG. 1 is a schematic diagram of a hydraulic motor of a charge pump circuit on a nuclear power plant in some embodiments of the invention;

FIG. 2 is an exploded view of the charge pump circuit hydraulic motor of the nuclear power plant shown in FIG. 1;

FIG. 3 is a second schematic diagram of a hydraulic motor of a charge pump circuit of a nuclear power plant in accordance with some embodiments of the present invention;

FIG. 4 is an exploded view of the charge pump circuit hydraulic motor of the nuclear power plant shown in FIG. 3;

FIG. 5 is a schematic illustration of a hydraulic motor with a hollow housing omitted from a charge pump circuit in a nuclear power plant in accordance with some embodiments of the present invention;

FIG. 6 is one of the cross-sectional views of a hydraulic motor of a charge pump circuit on a nuclear power plant in some embodiments of the invention;

FIG. 7 is a second cross-sectional view of a charge pump circuit hydraulic motor on a nuclear power plant in some embodiments of the invention;

fig. 8 is a comparison of good and poor spline lubrication of a hydraulic motor of a charge pump oil circuit in a nuclear power plant in some embodiments of the invention.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present invention.

It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present invention and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

Referring to fig. 1 to 4, the present invention shows a hydraulic motor of a charge pump oil circuit of a nuclear power plant, which includes a housing 10, a first gear shaft 20, a second gear shaft 30, and an output shaft 40. The first gear shaft 20 and the second gear shaft 30 are mounted in the housing 10, the second end of the output shaft 40 is mounted in the housing 10 and the first end of the output shaft 40 extends out of the housing 10. The first gear shaft 20 is provided at a first end with external splines 23 and the output shaft 40 is provided at a second end with internal splines 41, the external splines 23 being intermeshed with the internal splines 41. The first gear shaft 20 has a first through groove 20a penetrating through both axial ends thereof, and the second gear shaft 30 has a second through groove 30a penetrating through both axial ends thereof, both the first through groove 20a and the second through groove 30a communicating with an oil passage in the housing 10. The oil in the shell 10 can enter the parts of the external spline 23 and the internal spline 41 through the first through groove 20a and the second through groove 30a under the low pressure state, and the external spline 23 and the internal spline 41 are subjected to full oil lubrication, so that the abrasion coefficient is reduced, oxygen is isolated, the fretting abrasion angle is reduced, and the service life of the hydraulic motor of the oil filling loop of the nuclear power plant is prolonged.

In some embodiments, the housing 10 includes a hollow shell 11, a first end cap 12, and a second end cap 13; the first end cover 12 and the second end cover 13 are respectively installed at two axial ends of the hollow shell 11, and can be connected and fixed through fastening bolts and the like; the output shaft 40 is mounted in the first end cap 12.

The first gear shaft 20 and the second gear shaft 30 are mounted in the hollow housing 11, and the first oil hole 111 and the second oil hole 112 are provided at opposite sides of the hollow housing 11 in the circumferential direction, respectively.

Wherein, the first oil hole 111, the inner cavity of the hollow shell 11 and the second oil hole 112 are mutually matched to form an oil path.

As shown in fig. 5 and 7, the first oil hole 111 may be connected to an oil inlet pipe, the second oil hole 112 may be connected to an oil outlet pipe, and in a normal use state, high pressure oil enters the inner cavity of the hollow housing 11 from the oil inlet pipe and the first oil hole 111, drives the first gear shaft 20 and the second gear shaft 30 to rotate, so as to drive the output shaft 40 to rotate, and oil in the hollow housing 11 is discharged from the second oil hole 112 and the oil outlet pipe and sequentially circulated, thereby maintaining the rotation of the output shaft 40.

As shown in connection with fig. 6, in some embodiments, the first end cap 12 is provided with a first cavity 121, a second cavity 122, and a first passage 123, the first cavity 121 and the second cavity 122 being in communication through the first passage 123; the second end cover 13 is provided with a third cavity 131, a fourth cavity 132 and a second channel 133, and the third cavity 131 is communicated with the inner cavity of the hollow shell 11 through the second channel 133.

The first end of the first gear shaft 20 extends into the first cavity 121, and the two axial ends of the first through groove 20a are respectively communicated with the first cavity 121 and the third cavity 131; both ends of the second through groove 30a communicate with the second chamber 122 and the fourth chamber 132, respectively.

Preferably, the fourth chamber 132 penetrates the second end cap 13 to form an oil drain port.

The oil (such as lubricating oil) in the hollow shell 11 enters the third cavity 131 from the second channel 133, then enters the first through groove 20a from the third cavity 131, flows from the first through groove 20a to the first cavity 121, performs full oil lubrication on the external spline 23 and the internal spline 41, flows from the first cavity 121 into the first channel 123 to the second cavity 122, flows from the second cavity 122 to the fourth cavity 132 through the second through groove 30a to form a lubrication circuit, finally, the oil can be discharged from the fourth cavity 132, the fourth cavity 132 can be connected with an oil return pipeline, the oil return pipeline can be connected with an oil tank, the oil extraction amount is small, and the working efficiency of a hydraulic motor of a pump oil charging circuit on a nuclear power plant can not be reduced.

As shown in fig. 2 and 4, the first gear shaft 20 includes a first shaft body 21, and a first gear portion 22 is provided at a middle portion of the first shaft body 21. The second gear shaft 30 includes a second shaft body 31, and a second gear portion 32 is provided at a middle portion of the second shaft body 31. The first gear portion 22 intermeshes with the second gear portion 32.

Further, the hydraulic motor of the oil filling and pumping circuit of the nuclear power plant further comprises a first shaft sleeve 50 and a second shaft sleeve 60.

The first end of the first shaft body 21 and the first end of the second shaft body 31 are both mounted in the first shaft sleeve 50, and the second end of the second shaft body 31 are both mounted in the second shaft sleeve 60.

For example, the first shaft sleeve 50 may include a first sleeve body 51 and a second sleeve body 52 connected to each other, the first end of the first shaft body 21 is inserted into the first sleeve body 51, and the first end of the second shaft body 31 is inserted into the second sleeve body 52.

The second sleeve 60 may include a third sleeve body 61 and a fourth sleeve body 62 connected to each other, the second end of the first shaft body 21 is inserted into the third sleeve body 61, and the second end of the second shaft body 31 is inserted into the fourth sleeve body 62.

Further, a first seal ring 70 is fitted between the first sleeve 50 and the first end cap 12; a second seal ring 80 is fitted between the second sleeve 60 and the second end cap 13.

As shown in fig. 2, the first sleeve body 51 is provided with a first annular groove 511 and a first groove 512 on the side facing the first end cap 12, the first groove 512 communicates with the first annular groove 511, the second sleeve body 52 is provided with a second annular groove 521 and a second groove 522 on the side facing the first end cap 12, and the second groove 522 communicates with the second annular groove 521. The first annular groove 511 communicates with the second annular groove 521 through a first connection groove 513.

The first seal ring 70 includes a first annular portion 71 and a second annular portion 72, the first annular portion 71 and the second annular portion 72 are connected by a first connecting portion 73, at least one first protrusion 711 is provided on the first annular portion 71, and at least one second protrusion 721 is provided on the second annular portion 72.

The first annular portion 71 is embedded in the first annular groove 511, the second annular portion 72 is embedded in the second annular groove 521, the first connecting portion 73 is embedded in the first connecting groove 513, the first protruding portion 711 is embedded in the first groove 512, and the second protruding portion 721 is embedded in the second groove 522.

This form of mating provides for better spacing of the first seal ring 70 and good assembly stability.

As shown in fig. 4, the third sleeve body 61 is provided with a third annular groove 611 and a third groove 612 on the side facing the second end cover 13, the third groove 612 is communicated with the third annular groove 611, the fourth sleeve body 62 is provided with a fourth annular groove 621 and a fourth groove 622 on the side facing the second end cover 13, and the fourth groove 622 is communicated with the fourth annular groove 621. The third annular groove 611 communicates with the fourth annular groove 621 through the second connecting groove 613.

The second seal ring 80 includes a third annular portion 81 and a fourth annular portion 82, the third annular portion 81 and the fourth annular portion 82 are connected by a second connecting portion 83, at least one third protrusion 811 is provided on the third annular portion 81, and at least one fourth protrusion 821 is provided on the fourth annular portion 82.

Wherein, the third annular portion 81 is embedded in the third annular groove 611, the fourth annular portion 82 is embedded in the fourth annular groove 621, the second connecting portion 83 is embedded in the second connecting groove 613, the third protruding portion 811 is embedded in the third groove 612, and the fourth protruding portion 821 is embedded in the fourth groove 622.

This form of mating provides better spacing of the second seal ring 80 and good assembly stability.

As shown in fig. 2 and 6, in some embodiments, the housing 10 further includes an outer cavity 14, and the outer cavity 14 is connected to a side of the first end cap 12 facing away from the second end cap 13, and may be fastened in a threaded connection; the outer cavity 14 has a mounting cavity 141, the second end of the output shaft 40 is mounted in the mounting cavity 141, and the first end of the output shaft 40 is disposed through the outer cavity 14. The bearing 90 is provided in the mounting chamber 141, and the bearing 90 is fitted around a part of the outer periphery of the output shaft 40.

As shown in fig. 2, a boss portion 125 is disposed on a side of the first end cap 12 facing the outer cavity 14, the boss portion 125 may be in communication with the first cavity 121, and a limiting groove is disposed on an outer periphery of the boss portion 125 for a third sealing ring 100 to be sleeved therein. The boss 125 extends into the mounting cavity 141, and the outer periphery of the third seal ring 100 abuts against the inner wall surface of the mounting cavity 141, thereby achieving a sealing effect.

As shown in fig. 2 and 4, preferably, the side of the hollow housing 11 facing the first end cap 12 is provided with a protruding column 113, and the side of the first end cap 12 facing the hollow housing 11 is provided with a slot 124, which are inserted and fixed. The plurality of the protruding columns 113 may be disposed in the slots 124.

In some embodiments, the first through groove 20a and the second through groove 30a are circular grooves, and the inner diameters of the two grooves may be equal.

The hydraulic motor in the related art only considers the upper limit of the high pressure, and the problem of oil circulation in the low pressure working condition is ignored. The typical oil pressure of the hydraulic motor of the charge pump circuit in the nuclear power plant is 280bar, but there may be a case where the oil pressure is 30bar during operation, at this time, circulation of the lubricating oil in the hydraulic motor of the charge pump circuit in the nuclear power plant is blocked, the first gear shaft 20 has a first through groove 20a penetrating through both axial ends thereof, the second gear shaft 30 has a second through groove 30a penetrating through both axial ends thereof, and both the first through groove 20a and the second through groove 30a are communicated with the oil passage in the housing 10. The oil in the shell 10 can enter the parts of the external spline 23 and the internal spline 41 through the first through groove 20a and the second through groove 30a under the low pressure state, and the external spline 23 and the internal spline 41 are subjected to full oil lubrication, so that the abrasion coefficient is reduced, oxygen is isolated, the fretting abrasion angle is reduced, and the service life of the hydraulic motor of the oil filling loop of the nuclear power plant is prolonged. The oil mass of the lubricating loop is less, the working efficiency of the motor is not affected, the abrasion failure risk can be reduced, the loss caused by equipment outage is reduced, and the industrial practicability is high.

The mechanical field often uses the Archard formula for wear calculation. The data shows that the coefficient of wear between steel lacking lubrication and the coefficient of friction between lubricated steel and steel can be reduced by the order of 10-6.

In addition, according to the theory of fretting wear by materialization, oxidation wear is sent in the fretting wear process, and enough lubricating oil can isolate oxygen in the air, so that the wear acceleration effect caused by corrosion is reduced, and as shown in fig. 8, under the condition of good lubricating effect, the wear of the external spline 23 and the internal spline 41 is greatly reduced.

It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. The hydraulic motor of the upper oil filling and pumping loop of the nuclear power plant is characterized by comprising a shell (10), a first gear shaft (20), a second gear shaft (30) and an output shaft (40);

the first gear shaft (20) and the second gear shaft (30) are installed in the shell (10), the second end of the output shaft (40) is installed in the shell (10), and the first end of the output shaft (40) extends out of the shell (10);

an external spline (23) is arranged at the first end of the first gear shaft (20), an internal spline (41) is arranged at the second end of the output shaft (40), and the external spline (23) is matched with the internal spline (41);

the first gear shaft (20) is provided with a first through groove (20 a) penetrating through two axial ends of the first gear shaft, the second gear shaft (30) is provided with a second through groove (30 a) penetrating through two axial ends of the second gear shaft, and the first through groove (20 a) and the second through groove (30 a) are communicated with an oil way in the shell (10).

2. The nuclear power plant oil up-fill circuit hydraulic motor of claim 1, wherein the housing (10) comprises a hollow shell (11), a first end cap (12) and a second end cap (13); the first end cover (12) and the second end cover (13) are respectively arranged at two axial ends of the hollow shell (11); the output shaft (40) is mounted in the first end cap (12);

the first gear shaft (20) and the second gear shaft (30) are installed in the hollow shell (11), and a first oil hole (111) and a second oil hole (112) are respectively formed in two opposite sides of the hollow shell (11) in the circumferential direction;

the first oil hole (111), the inner cavity of the hollow shell (11) and the second oil hole (112) are mutually matched to form the oil way.

3. The nuclear power plant oil up-fill circuit hydraulic motor of claim 2 wherein the first end cap (12) is provided with a first cavity (121), a second cavity (122) and a first passage (123), the first cavity (121) and the second cavity (122) being in communication through the first passage (123); a third cavity (131), a fourth cavity (132) and a second channel (133) are arranged on the second end cover (13), and the third cavity (131) is communicated with the inner cavity of the hollow shell (11) through the second channel (133);

the first end of the first gear shaft (20) stretches into the first cavity (121), and the two axial ends of the first through groove (20 a) are respectively communicated with the first cavity (121) and the third cavity (131); both ends of the second through groove (30 a) are respectively communicated with the second cavity (122) and the fourth cavity (132).

4. A nuclear power plant oil up-fill circuit hydraulic motor according to claim 3, characterized in that the fourth cavity (132) extends through the second end cap (13).

5. The hydraulic motor of a nuclear power plant oil charging and pumping circuit according to claim 4, wherein the first gear shaft (20) comprises a first shaft body (21), and a first gear portion (22) is arranged in the middle of the first shaft body (21);

the second gear shaft (30) comprises a second shaft body (31), and a second gear part (32) is arranged in the middle of the second shaft body (31); the first gear portion (22) intermeshes with the second gear portion (32).

6. The nuclear power plant charge pump oil circuit hydraulic motor of claim 5, further comprising a first bushing (50) and a second bushing (60);

the first end of the first shaft body (21) and the first end of the second shaft body (31) are both installed in the first shaft sleeve (50), and the second end of the second shaft body (31) are both installed in the second shaft sleeve (60).

7. The hydraulic motor of a nuclear power plant oil charging and pumping circuit according to claim 6, wherein a first seal ring (70) is fitted between the first sleeve (50) and the first end cap (12);

a second sealing ring (80) is matched between the second shaft sleeve (60) and the second end cover (13).

8. The hydraulic motor of a charge pump circuit on a nuclear power plant according to any one of claims 2 to 7, characterized in that the housing (10) further comprises an outer cavity (14), the outer cavity (14) being connected to a side of the first end cap (12) facing away from the second end cap (13);

the outer cavity (14) is provided with an installation cavity (141), the second end of the output shaft (40) is installed in the installation cavity (141), and the first end of the output shaft (40) penetrates through the outer cavity (14).

9. The hydraulic motor of a nuclear power plant oil charging and pumping circuit according to claim 8, wherein a bearing (90) is arranged in the installation cavity (141), and the bearing (90) is sleeved on a part of the periphery of the output shaft (40).

10. The hydraulic motor of a charge pump circuit of a nuclear power plant according to any one of claims 1 to 7, wherein the first through slot (20 a) and the second through slot (30 a) are both circular slots.