CN210460772U - Turbo machine and mechanical axial displacement protection device thereof - Google Patents

Abstract

The utility model discloses a turbo machine and mechanical type axial displacement protection device thereof, the device and the coaxial and relative bearing frame that is fixed in the rotor of rotor, include: the bearing seat comprises a shell, a bearing seat and a bearing seat, wherein an accommodating cavity which is opened towards one side of the bearing seat is formed in the shell, the opening of the accommodating cavity is fixed on the bearing seat, and a first oil hole communicated with an oil source is formed in the side wall of the shell; the sleeve is provided with a cavity and sleeved in the accommodating cavity, a second oil hole is formed in the side wall of the sleeve, which is close to one end of the bearing seat, the second oil hole is communicated with the bearing seat, and a third oil hole communicated with the first oil hole is formed in the side wall of one end, which is far away from the bearing seat, of the sleeve; the sliding component is provided with a cavity, is sleeved in the sleeve, and one end of the sliding component close to the bearing seat is in smooth contact with the end surface of the rotor; a plurality of fourth oil holes are formed in the side wall of the sliding part, and are correspondingly formed in two sides of the second oil hole; the device may trigger a turbomachine shutdown when the axial displacement occurs or exceeds a threshold value.

Description

Turbo machine and mechanical axial displacement protection device thereof

Technical Field

The utility model relates to a mechanical type axial displacement protection device, the device can be applied to among the high-speed rotatory turbomachinery such as steam turbine, compressor and air-blower, belong to the partly of unit safety protection system.

Background

In the running process of the turbo machinery, axial acting force (hereinafter referred to as axial force) can be generated due to the interaction of the rotor and fluid, the axial acting force can increase the load of a thrust bearing, the rotor can possibly move in the opposite direction of the acting force of the fluid to cause axial displacement, the service life of equipment bearings, sealing parts and the like is reduced, even the equipment bearings, the sealing parts and the like are directly damaged, and the impeller and a partition plate with relatively small dynamic and static gaps are greatly damaged. In the prior art, the following two solutions are generally adopted to solve the problem:

one is to provide a corresponding balance thrust to counteract the axial force, thereby avoiding the occurrence of axial displacement; specifically, a differential pressure type thrust balancing device is adopted to offset most of thrust, a certain amount of residual axial force is kept, and the load of a thrust bearing is reduced, so that the generation of axial displacement is reduced; for example, chinese patent application publication No. CN1749573A discloses a differential pressure type thrust balancing device for a rotary fluid machine, which adjusts the pressure difference between the front and the rear of a balancing disk by adjusting the flow rate flowing through a fluid passage, thereby adjusting the balancing thrust according to the axial force.

The other is to stop the equipment when the axial displacement occurs so as to avoid the damage of the axial displacement to the equipment in the continuous operation process of the equipment; the specific working principle is as follows: when the axial displacement or the movement is overlarge during the operation of the steam turbine, the mechanical axial displacement protection device triggers the quick closing valve and the regulating steam valve to be quickly closed through releasing quick closing oil (E) so as to force the unit to be emergently stopped. At present, only an electronic axial displacement alarm device is usually arranged in turbomachinery, and an electronic alarm tripping device in the industrial field has certain risks, so that once the axial displacement is too large, a thrust bearing can be burnt, and the impeller and the partition plate with relatively small dynamic and static gaps are greatly damaged.

In summary, the existing technical scheme can reduce the possibility of occurrence of axial displacement to a certain extent, but after the occurrence of the axial displacement, the shutdown protection device has certain technical defects, and cannot fundamentally avoid damage to equipment caused by the axial displacement.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem, the utility model discloses a first aim at: a mechanical axial displacement protection device is provided that triggers a turbomachine shutdown when an axial displacement occurs or exceeds a threshold value, thereby avoiding damage to the turbomachine from the axial displacement.

The utility model discloses a second aim at: a turbo machine applying the mechanical axial displacement protection device is provided.

In view of the above, one aspect of the present invention is to provide a mechanical axial displacement protection device, which is fixed to a bearing seat of a rotor coaxially and oppositely to the rotor;

the mechanical axial displacement protection device comprises:

the bearing seat is provided with a lubricating oil passage, and the lubricating oil passage is communicated with the lubricating oil passage; a first oil hole communicated with the quick-closing oil way is formed in the side wall of the shell;

the sleeve is provided with a cavity, the sleeve is arranged in the accommodating cavity, a second oil hole is formed in the side wall of one end, close to the bearing seat, of the sleeve, the second oil hole is communicated with the through hole of the bearing seat, and a third oil hole communicated with the first oil hole is formed in the side wall of one end, far away from the bearing seat, of the sleeve;

the sliding component is provided with a cavity, is arranged in the cavity of the sleeve and can move along the axial direction, and the cavity of the sliding component is communicated with the cavity of the sleeve; one end of the sliding component close to the bearing seat is abutted against the end face of the rotor, so that the sliding component can move along with the rotor in the axial direction; a plurality of fourth oil holes communicated with the cavity of the sliding part are formed in the side wall of the sliding part, and the plurality of fourth oil holes are correspondingly formed in the left side and the right side of the second oil hole, so that when the axial displacement of the sliding part moving along with the rotor exceeds a threshold value, at least one fourth oil hole is communicated with the second oil hole;

the oil in the quick-closing oil way enters a cavity of the sliding part through the first oil hole and the third oil hole, when the axial displacement of the rotor is smaller than the distance between the second oil hole and the fourth oil hole, the second oil hole is not communicated with the fourth oil hole, and the oil pressure in the sliding part is kept unchanged; when the axial displacement of the rotor is larger than the distance between the second oil hole and the fourth oil hole, the second oil hole is communicated with the fourth oil hole, so that oil in the sliding part is discharged to the lubricating oil way through the fourth oil hole, the second oil hole and the through holes in the bearing seat, the oil pressure in the quick-closing oil way is reduced, and the stopping action is triggered.

Preferably, one end of the sliding component, which is far away from the bearing seat, is abutted against one end of the sleeve, which is far away from the bearing seat, through an elastic component; and after the rotor returns, the elastic component drives the sliding component to return.

Preferably, an adjusting nut for adjusting the axial position of the sleeve is arranged at one end of the shell, which is far away from the bearing seat, one end of the adjusting nut is arranged outside the shell, and the other end of the adjusting nut penetrates through the shell and is in threaded connection with one end of the sleeve, which is far away from the bearing seat; the axial relative position of the sleeve and the sliding component is adjusted through the adjusting nut, so that the positive and negative thresholds of the axial displacement are adjusted.

Preferably, a cushion block is arranged between the adjusting nut and the shell, and the adjusting nut penetrates through the cushion block and the shell in sequence and then is connected to one end, far away from the bearing block, of the sleeve.

Preferably, a first annular groove with a width dimension larger than the radial dimension of the first oil hole is formed in the inner wall of the housing corresponding to the first oil hole, so that the third oil hole is always communicated with the first oil hole;

or the longitudinal section of the first oil hole is T-shaped from inside to outside, and the inner aperture of the first oil hole is larger than that of the third oil hole, so that the third oil hole is always communicated with the first oil hole when the axial position of the sleeve changes.

Preferably, a second annular groove is formed in an inner wall of the housing at the opening end of the accommodating chamber, and the second annular groove is communicated with the second oil hole and the bearing seat, so that the second oil hole is always communicated with the bearing seat.

Preferably, circumferential positions of the housing, the sleeve, and the sliding member are relatively fixed such that the fourth oil hole and the second oil hole at least partially overlap when an axial displacement of the sliding member exceeds a threshold value.

Preferably, a first pin hole is formed in the side wall of the housing, a second pin hole coaxial with the first pin hole is formed in the side wall of the sleeve, a waist hole extending in the axial direction is formed in the side wall of the sliding part, and an anti-rotation pin penetrates through the first pin hole, the second pin hole and the waist hole.

Preferably, the sleeve is integrally formed with the housing.

The utility model discloses a mechanical type axial displacement protection device, including as above arbitrary any, on the bearing frame of this mechanical type axial displacement protection device's one end passed through the bolt fastening in rotor, the oil circuit was closed to the other end and turbomachinery's speed, when the axial displacement of the rotor among the turbomachinery exceeded the threshold value, this mechanical type axial displacement protection device triggered this speed and closed the fluid transfer passage between fluid source and the turbomachinery to trigger and shut down the action.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model adopts the mechanical axial displacement protection device, compared with the electronic alarm tripping device, the mechanical axial displacement protection device has higher stability in structure and performance;

when axial displacement appears or exceeds a threshold value, the device can trigger the turbine machinery to stop through a mechanical structure, the axial displacement threshold value is controllable, the reaction is accurate, and damage of the axial displacement to the turbine machinery can be effectively avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

Fig. 1 is a schematic structural diagram of a mechanical axial displacement protection system according to an embodiment of the present invention;

fig. 2 is a schematic view of a partial cross-sectional structure of a mechanical axial displacement protection device according to an embodiment of the present invention.

100. A turbomachine; 200. a source of oil; 300. a fluid source;

1. a rotor; 2. a bearing seat; 3. a mechanical axial displacement protection device; 4. quickly closing an oil way; 6. a fluid delivery channel; 7. a throttling member;

31. a housing; 32. a sleeve; 33. a sliding member; 34. a first bolt; 35. an anti-backup pin; 36. adjusting the nut; 37. a fixing pin; 38. cushion blocks; 39. a second bolt;

311. a first oil hole; 312. a first annular groove; 313. a second annular groove; 314. a seal ring;

321. a second oil hole; 322. a third oil hole;

331. a fourth oil hole; 332. an elastic member; 333. a waist hole;

41. a first valve; 42. the first valve controls the oil cylinder; 43. a second valve; 44. a third valve;

51. a flow regulating valve; 52. a speed regulator; 53. an oil-operated machine; 54. the flow control valve controls the oil cylinder.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Furthermore, in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The invention will be further explained with reference to the following embodiments and drawings:

as shown in fig. 1, a mechanical axial displacement protection system includes a mechanical axial displacement protection device 3 and a quick-closing oil passage 4;

the mechanical axial displacement protection device 3 is fixed on a bearing seat 2 of the rotor 1 of the turbomachine 100 opposite to and coaxially with the rotor 1, and the bearing seat 2 is provided with a through hole which is communicated with a lubricating oil path; the mechanical axial displacement protection device comprises a first oil hole 311 communicated with a quick-closing oil way 4 and an oil drainage channel which can be communicated with a through hole of a bearing seat 2 according to the position change condition: when the axial displacement of the rotor 1 is lower than the threshold value, the oil drainage channel is not communicated with the bearing seat 2, and the oil pressure in the mechanical axial displacement protection device 3 and the quick-closing oil way 4 is kept unchanged; when the axial displacement of the rotor 1 exceeds a threshold value, the oil drainage channel is communicated with the bearing seat 2, and oil in the mechanical axial displacement protection device 3 is drained to a lubricating oil way through the oil drainage channel and a through hole of the bearing seat 2, so that the internal oil pressure is quickly reduced;

the quick-closing oil path 4 comprises a first valve 41 and a first valve 41 control cylinder, wherein a control end of the first valve 41 control cylinder is communicated with the first oil hole 311 of the mechanical axial displacement protection device 3, an action end of the first valve 41 control cylinder is connected with the first valve 41, and the first valve 41 is arranged on a fluid conveying channel 6 connecting the fluid source 300 and the turbine machine 100; when the oil pressure in the mechanical axial displacement protection device is reduced, the speed-closing oil passage 4 controls to close the first valve 41, so that the fluid delivery passage 6 of the fluid source 300 is closed.

As a preferred embodiment, referring to fig. 2, the mechanical axial displacement protection device 3 is fixed to the bearing housing 2 of the rotor 1 coaxially and oppositely to the rotor 1, and comprises:

a housing 31, wherein an accommodating cavity which is open to one side of the bearing seat 2 is formed in the housing 31, the open end of the accommodating cavity is fixed on the bearing seat 2, and a through hole is formed in the bearing seat 2 and is communicated with a lubricating oil path; a first oil hole 311 communicated with the quick-closing oil passage 4 is formed in the side wall of the shell 31;

a sleeve 32 with a cavity, the sleeve 32 is arranged in the accommodating cavity, a second oil hole 321 is arranged on the side wall of one end of the sleeve 32 close to the bearing seat 2, the second oil hole 321 is communicated with the through hole of the bearing seat 2, and a third oil hole 322 communicated with the first oil hole 311 is arranged on the side wall of one end of the sleeve 32 far away from the bearing seat 2;

a slide member 33 having a cavity, the slide member 33 being mounted in the cavity of the sleeve 32 so as to be movable in the axial direction, and the cavity of the slide member 33 being communicated with the cavity of the sleeve 32; one end of the sliding component 33 close to the bearing seat 2 is abutted against the end face of the rotor 1, so that the sliding component can move along with the rotor 1 along the axial direction; a plurality of fourth oil holes 331 communicating with the cavity of the sliding member 33 are formed in the side wall of the sliding member 33, and the plurality of fourth oil holes 331 are correspondingly formed at the left and right sides of the second oil hole 321, so that at least one fourth oil hole 331 communicates with the second oil hole 321 when the axial displacement of the sliding member 33 moving with the rotor 1 exceeds a threshold value;

the oil in the quick-closing oil path 4 enters the cavity of the sliding part 33 through the first oil hole 311 and the third oil hole 322, and when the axial displacement of the rotor 1 is smaller than the distance between the second oil hole 321 and the fourth oil hole 331, the second oil hole 321 is not communicated with the fourth oil hole 331, and the oil pressure in the sliding part 33 is kept unchanged; when the axial displacement of the rotor 1 is greater than the distance between the second oil hole 321 and the fourth oil hole 331, the second oil hole 321 is communicated with the fourth oil hole 331, so that the oil in the sliding part 33 is discharged to the lubricating oil path through the fourth oil hole 331, the second oil hole 321 and the through holes in the bearing seat 2, the oil pressure in the quick-closing oil path 4 is reduced, and the stopping action is triggered.

As a preferred embodiment, the end of the sliding member 33 away from the bearing seat 2 is abutted against the end of the sleeve 32 away from the bearing seat 2 through an elastic member 332; when the rotor 1 returns, the elastic member 332 drives the sliding member 33 to return.

As a preferred embodiment, in order to avoid the axial error caused by long-term use, or in some cases, in consideration of setting different values for the positive and negative thresholds of the axial displacement, the sleeve 32 is configured to be axially adjustable, so that the axial distance between the second oil hole 321 and the fourth oil holes 331 on both sides thereof is adjusted by finely adjusting the axial position of the sleeve 32, thereby achieving the setting of the positive and negative thresholds of the axial displacement. Specifically, the scheme may be: an adjusting nut 36 for adjusting the axial position of the sleeve 32 is arranged at one end of the shell 31 far away from the bearing seat 2, one end of the adjusting nut 36 is arranged outside the shell 31, and the other end of the adjusting nut 36 penetrates through the shell 31 and is in threaded connection with one end of the sleeve 32 far away from the bearing seat 2; the axial relative position of the sleeve 32 and the sliding member 33 is adjusted by the adjusting nut 36, and the positive and negative thresholds of the axial displacement are adjusted.

In a preferred embodiment, a spacer 38 is disposed between the adjusting nut 36 and the housing 31, and the adjusting nut 36 penetrates the spacer 38 and the housing 31 in sequence and is connected to an end of the sleeve 32 away from the bearing seat 2.

As a preferred embodiment, a first annular groove 312 having a width dimension larger than the radial dimension of the first oil hole 311 is formed in the inner wall of the housing 31 corresponding to the first oil hole 311, so that the third oil hole 322 is always communicated with the first oil hole 311;

alternatively, in another preferred embodiment, the first oil hole 311 may be configured as follows: the longitudinal section of the oil hole is T-shaped from inside to outside, and the inner bore diameter of the first oil hole 311 is larger than that of the third oil hole 322, so that the third oil hole 322 is always communicated with the first oil hole 311 when the axial position of the sleeve 32 changes.

As a preferred embodiment, a second annular groove 313 is provided on the inner wall of the housing 31 at the open end of the receiving chamber, and the second annular groove 313 communicates with the second oil hole 321 and the bearing housing 2, so that the second oil hole 321 communicates with the bearing housing 2 at all times.

As a preferred embodiment, in order to prevent the axial displacement of the sliding member 33 due to the change of the relative circumferential position between the sliding member 33 and the sleeve 32 and/or the housing 31, which results in the axial displacement of the sliding member 33, and the axial displacement of the second oil hole 321 and the fourth oil hole 331 being misaligned and unable to communicate with each other, the present embodiment fixes the circumferential relative positions of the housing 31, the sleeve 32, and the sliding member 33, such that the fourth oil hole 331 and the second oil hole 321 communicate with each other when the axial displacement of the sliding member 33 is greater than the distance between the fourth oil hole 331 and the second oil hole 321.

In a preferred embodiment, the side wall of the housing 31 is provided with a first pin hole, the side wall of the sleeve 32 is provided with a second pin hole coaxial with the first pin hole, particularly, the side wall of the sliding member 33 is provided with a waist hole 333 extending along the axial direction, and an anti-rotation pin is penetrated and fixed among the first pin hole, the second pin hole and the waist hole 333, and at the same time, the part adopts the structure of the waist hole 333 extending along the axial direction, so that the sleeve 32 is not limited to move axially within the threshold range.

In a preferred embodiment, the housing 31 is detachable, such as comprising an upper housing 31 and a lower housing 31, the upper housing 31 and the lower housing 31 are fastened to form a receiving cavity, so that the sleeve 32 and the sliding member 33 can be replaced according to actual conditions, for example, when the difference between the positive and negative thresholds of the axial displacement needs to be reduced or increased as a whole, the sleeve 32 with the second oil hole 321 having a corresponding diameter and/or the sliding member 33 with the corresponding distance between the two fourth oil holes 331 can be replaced. Of course, the housing 31 may also be a structure detachable from left and right, or a structure detachable from front and back, and the like, which is not limited in the present application.

As a preferred embodiment, the sliding member 33 comprises a spool valve.

Of course, in other preferred embodiments, the sleeve 32 is integrally formed with the housing 31.

As a preferred embodiment, one end of the housing 31 near the bearing housing 2 is fixed to the bearing housing 2 by a first screw.

In a preferred embodiment, the sleeve 32 is integrally formed with the housing 31.

As a preferred embodiment, the quick-closing oil circuit 4 further includes a second valve 43 disposed between a control end of the control cylinder of the first valve 41 and the first oil hole 311, and before the turbo machine 100 is started, the second valve 43 is opened first to ensure that the control cylinder of the first valve 41 controls the first valve 41 to open, so that the fluid delivery passage 6 between the fluid source 300 and the control device of the turbo machine 100 is opened.

As a preferred embodiment, as shown in fig. 1, the quick-closing oil path 4 further includes a third valve 44 disposed between the other control end of the first valve 41 control cylinder and the first oil hole 311, wherein the second valve 43 is opened before the start of the turbo machine 100, the third valve 44 is opened after the first valve 41 control cylinder opens the first valve 41, the first valve 41 control cylinder is pressurized, and the second valve 43 is closed after the oil pressure in the quick-closing oil path 4 is stabilized.

As a preferred embodiment, the mechanical axial displacement protection system further comprises a flow regulating valve 51 and a control part of the flow regulating valve 51, the flow regulating valve 51 is disposed on the fluid conveying passage 6 between the fluid source 300 and the turbomachine 100, and the control part of the flow regulating valve 51 is disposed between the flow regulating valve 51 and the first oil hole 311 of the mechanical axial displacement protection device 3; when the oil pressure in the mechanical axial displacement protection device is reduced, the control component of the flow regulating valve 51 controls to close the flow regulating valve 51, so that the fluid conveying channel 6 is closed.

In a preferred embodiment, the control component of the flow regulating valve 51 includes a governor 52, a servomotor 53 and a flow regulating valve 51 control cylinder, the governor 52 is connected to the first oil hole 311, the servomotor 53 and the flow regulating valve 51 control cylinder, respectively, the servomotor 53 and the flow regulating valve 51 control cylinder are both connected to the flow regulating valve 51, and when the oil pressure in the mechanical axial displacement protection device decreases, the governor 52 controls the operation of the servomotor 53 and the flow regulating valve 51 control cylinder to close the flow regulating valve 51.

As a preferred embodiment, the first oil hole 311 of the mechanical axial displacement protection device 3 is further communicated with the oil source 200, and a throttling part 7 is arranged between the oil source 200 and the first oil hole 311, preferably, the throttling part 7 comprises a throttling valve.

In the above structure, as shown in fig. 2, the sliding member 33 is slidable in the axial direction in the sleeve 32 fitted into the housing 31, and one end of the sliding member 33 close to the bearing housing 2 is in smooth contact with the end surface of the rotor 1 rotating at a high speed close to the bearing housing 2. The shell 31 is fixed on the bearing seat 2 by a first bolt 34 and is positioned by a taper pin, and a sealing ring 314 is additionally arranged between the shell 31 and the bearing seat 2 in order to ensure the tightness of the assembly between the shell 31 and the bearing seat 2.

Referring to fig. 2, in a normal state, the speed-closing control oil enters the speed-closing oil control chamber B of the device from the port P, enters the inner chamber C through the third oil hole 322 of the sleeve 32, and selectively communicates with the bearing housing 2 through the fourth oil hole 331. The distance between the fourth oil hole 331 and the second oil hole 321 is the set value of the axial displacement.

The sliding member 33 is tightly pressed against the end face of the rotor 1 by the elastic member 332, and the speed-closing control oil passage has a stable oil pressure. When the axial displacement of the rotor 1 of the turbomachine 100 changes, the sliding part 33 moves in the positive direction or the negative direction along with the rotor 1, when the axial displacement exceeds a threshold value (a design protection value), oil passages of oil drainage passages are communicated, the quick-closing control oil in the sliding part 33 is drained to the bearing seat 2 through the oil drainage passages, the oil pressure drops rapidly, and the quick-closing valve and the steam regulating valve are closed, so that the emergency stop of the turbine is realized.

When the unit is reset, the sliding part 33 is tightly pressed on the end surface of the rotor 1 by the elastic part 332 again, so that the speed-closing control oil path has stable oil pressure, and the normal work of the turbo machine 100 is ensured.

The present embodiment further provides a turbomachine 100 based on the above-mentioned mechanical axial displacement protection device and system, where the turbomachine 100 includes the mechanical axial displacement protection system as described above, and one end of the mechanical axial displacement protection system is fixed to the bearing seat 2 of the rotor 1 through a bolt, and when the axial displacement of the rotor 1 in the turbomachine 100 exceeds a threshold value, the mechanical axial displacement protection system controls the turbomachine 100 to stop.

In summary, the mechanical axial displacement protection device has higher stability in structure and performance compared with an electronic alarm tripping device; in addition, the axial displacement protection threshold value of the mechanical axial displacement protection system can be adjusted by changing the axial distance between the second oil hole and the fourth oil holes on the left side and the right side, so that the mechanical axial displacement protection system allows smaller axial displacement, and the turbine machine is prevented from being frequently stopped due to over sensitivity; normally, the axial distance between the second oil hole and the fourth oil holes on the left and right sides can be realized by replacing the sliding part or the sleeve;

when axial displacement appears or exceeds a threshold value, the system can trigger the turbine machinery to stop through a mechanical structure, the axial displacement threshold value is controllable, the reaction is accurate, and damage of the axial displacement to the turbine machinery can be effectively avoided.

Further, it should be noted that:

in the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the spirit and scope of the present invention, and that any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.

Claims (10)

1. A mechanical axial displacement protection device is characterized in that the mechanical axial displacement protection device is coaxially and oppositely fixed on a bearing seat (2) of a rotor (1) with the rotor (1);

the mechanical axial displacement protection device comprises:

the bearing seat comprises a shell (31), wherein an accommodating cavity which is opened towards one side of the bearing seat (2) is formed in the shell (31), the opening end of the accommodating cavity is fixed on the bearing seat (2), and a through hole is formed in the bearing seat (2) and is communicated with a lubricating oil path; a first oil hole (311) communicated with the quick-closing oil way (4) is formed in the side wall of the shell (31);

the sleeve (32) is provided with a cavity, the sleeve (32) is arranged in the accommodating cavity, a second oil hole (321) is formed in the side wall of one end, close to the bearing seat (2), of the sleeve (32), the second oil hole (321) is communicated with the through hole in the bearing seat (2), and a third oil hole (322) communicated with the first oil hole (311) is formed in the side wall of one end, far away from the bearing seat (2), of the sleeve (32);

a sliding member (33) having a cavity, the sliding member (33) being mounted in the cavity of the sleeve (32) so as to be movable in the axial direction, and the cavity of the sliding member (33) being in communication with the cavity of the sleeve (32); one end of the sliding component (33) close to the bearing seat (2) is abutted against the end face of the rotor (1), so that the sliding component can move along the axial direction along with the rotor (1); a plurality of fourth oil holes (331) communicated with the cavity of the sliding part (33) are formed in the side wall of the sliding part (33), and the plurality of fourth oil holes (331) are correspondingly formed in the left side and the right side of the second oil hole (321), so that when the axial displacement of the sliding part (33) along with the movement of the rotor (1) exceeds a threshold value, at least one fourth oil hole (331) is communicated with the second oil hole (321);

oil in the quick-closing oil passage (4) enters a cavity of the sliding part (33) through the first oil hole (311) and the third oil hole (322), when the axial displacement of the rotor (1) is smaller than the distance between the second oil hole (321) and the fourth oil hole (331), the second oil hole (321) is not communicated with the fourth oil hole (331), and the oil pressure in the sliding part (33) is kept unchanged; when the axial displacement of the rotor (1) is larger than the distance between the second oil hole (321) and the fourth oil hole (331), the second oil hole (321) is communicated with the fourth oil hole (331), so that oil in the sliding part (33) is released to a lubricating oil path through the fourth oil hole (331), the second oil hole (321) and through holes in the bearing seat (2), and the oil pressure in the quick closing oil path (4) is reduced to trigger the stop action.

2. A mechanical axial displacement protection device according to claim 1, characterized in that the end of the sliding member (33) remote from the bearing seat (2) is urged against the end of the sleeve (32) remote from the bearing seat (2) by means of an elastic member (332); when the rotor returns, the elastic component (332) drives the sliding component (33) to return.

3. A mechanical axial displacement protection device according to claim 2, wherein an adjusting nut (36) for adjusting the axial position of the sleeve (32) is arranged at one end of the housing (31) away from the bearing seat (2), one end of the adjusting nut (36) is arranged outside the housing, and the other end of the adjusting nut (36) penetrates through the housing (31) and is in threaded connection with one end of the sleeve (32) away from the bearing seat (2); the relative axial position of the sleeve (32) and the sliding member (33) is adjusted by the adjusting nut (36), and the positive and negative thresholds of the axial displacement are adjusted.

4. A mechanical axial displacement protection device according to claim 3, characterized in that a spacer (38) is arranged between the adjusting nut (36) and the housing (31), and the adjusting nut (36) is connected to one end of the sleeve (32) away from the bearing seat (2) after sequentially penetrating through the spacer (38) and the housing (31).

5. A mechanical axial displacement protector according to claim 2, characterized in that the inner wall of the housing (31) corresponding to the first oil hole (311) is provided with a first annular groove (312) having a width dimension greater than the radial dimension of the first oil hole (311) so that the third oil hole (322) is always in communication with the first oil hole (311);

or the longitudinal section of the first oil hole (311) is T-shaped from inside to outside, the inner aperture of the first oil hole (311) is larger than the aperture of the third oil hole (322), so that the third oil hole (322) is always communicated with the first oil hole (311) when the axial position of the sleeve (32) changes.

6. A mechanical axial displacement protector according to claim 5 characterized in that the inner wall of the housing (31) at the open end of the receiving cavity is provided with a second annular groove (313), the second annular groove (313) communicating with the second oil hole (321) and the bearing seat (2), so that the second oil hole (321) is always in communication with the bearing seat (2).

7. A mechanical axial displacement protection device according to claim 6, wherein the circumferential positions of the housing (31), the sleeve (32) and the sliding member (33) are relatively fixed, such that the fourth oil hole (331) communicates with the second oil hole (321) when the axial displacement of the sliding member (33) exceeds a threshold value.

8. A mechanical axial displacement protector according to claim 7 characterised in that the housing (31) is provided with a first pin hole in the side wall, the sleeve (32) is provided with a second pin hole in the side wall coaxial with the first pin hole, the slide member (33) is provided with an axially extending waist hole (333) in the side wall, and an anti-rotation pin extends through the first pin hole, the second pin hole and the waist hole (333).

9. A mechanical axial displacement protection device according to claim 1, wherein the sleeve (32) is integrally formed with the housing (31).

10. A turbomachine comprising a mechanical axial displacement protection device according to any one of claims 1 to 9.

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