CN218407553U - Steam turbine and steam turbine set with damping structure - Google Patents

Abstract

The utility model relates to a steam turbine and a steam turbine set with a vibration damping structure, which comprises a bearing, a bearing bush cover and a vibration damping structure, wherein the bearing is positioned at the inner side of the bearing bush, the bearing bush cover is arranged at the outer side of the bearing bush, and a first threaded hole is arranged on the bearing bush cover; a first external thread is formed on the outer surface of the vibration reduction structure, the vibration reduction structure at least partially penetrates through the first threaded hole, the first external thread is in threaded connection with the first threaded hole, and one end, close to the bearing bush, of the vibration reduction structure abuts against the bearing bush. Through above-mentioned technical scheme, the one end that the damping structure of installing in first screwed hole is close to the axle bush supports and pushes up on the axle bush, can realize compressing tightly the axle bush, avoids or alleviates the too big problem of self-excited vibration of this axle bush to promote the stability of this axle bush in the operation process, and then promote the stability of setting at the inboard bearing of this axle bush in the operation process, reduce the shut down maintenance number of times to the steam turbine, reach the purpose that promotes steam turbine efficiency.

Description

Steam turbine and steam turbine set with damping structure

Technical Field

The disclosure relates to the technical field of steam turbines, in particular to a steam turbine with a vibration reduction structure and a steam turbine unit.

Background

In a steam turbine, a bearing shell is one of important components of a bearing, is a part of a sliding bearing, which is in contact with a shaft, and is generally supported by wear-resistant materials such as bronze, antifriction alloy and the like, and mainly has the functions of bearing acting force applied by a journal, keeping an oil film stable, enabling the bearing to work smoothly and reducing friction loss of the bearing. Among the prior art, at the bearing pivoted in-process of steam turbine, the problem of self-excited vibration often can take place for the axle bush, and the vibration of axle bush can drive the vibration of bearing, causes the influence to the normal operating of steam turbine, at this moment, just needs shut down the steam turbine group to carry out the inspection maintenance to the axle bush, and this will cause the influence to the efficiency of steam turbine.

SUMMERY OF THE UTILITY MODEL

The purpose of this disclosure is to provide a steam turbine and a steam turbine set with damping structure to solve the technical problem that exists in the correlation technique.

In order to achieve the above object, according to a first aspect of the present disclosure, a steam turbine with a damping structure is provided, including a bearing, a bearing shell cover, and a damping structure, where the bearing is located inside the bearing shell, the bearing shell cover is located outside the bearing shell, and a first threaded hole is opened in the bearing shell cover;

the outer surface of the vibration reduction structure is provided with a first external thread, the vibration reduction structure at least partially penetrates through the first threaded hole, the first external thread is in threaded connection with the first threaded hole, and one end, close to the bearing bush, of the vibration reduction structure abuts against the bearing bush.

Optionally, the damping structure includes the damping rod, the damping rod includes the body of rod and forms the portion of revolving on the body of rod, the body of rod includes polished rod section and screw rod section, the screw rod section is located the polished rod section with revolve between the portion of revolving, first external screw thread forms on the outer peripheral face of screw rod section.

Optionally, the length of the polished rod section is greater than the length of the screw section.

Optionally, the vibration reduction structure further includes a first nut, the first nut is screwed to the first external thread, and the first nut abuts against a side of the bearing shell cover away from the bearing shell.

Optionally, the vibration damping structure includes a vibration damping rod and a second nut, the vibration damping rod includes a screw portion and a screwing portion formed on the screw portion, a second external thread is formed on an outer peripheral surface of the screw portion, a second threaded hole is formed on the second nut, the second nut is sleeved on the screw portion, and the second external thread hole is connected with the external thread;

the second nut comprises a screwing section and a threaded section, and the first external thread is formed on the outer peripheral surface of the threaded section.

Optionally, the screwing segment has an abutting portion protruding beyond the threaded segment in a radial direction of the second nut, and the abutting portion abuts against a side of the bearing shell cover facing away from the bearing shell.

Optionally, the damping structure is provided with a marking line, and when one end of the damping structure close to the bearing bush abuts against the bearing bush, the marking line is located in the first threaded hole.

Optionally, the number of the first threaded holes is two, the two first threaded holes are symmetrically arranged about a longitudinal center line of the bearing cap, and each first threaded hole is internally and threadedly connected with the vibration damping structure.

Optionally, an end surface of the vibration reduction structure close to the bearing bush is a flat surface.

According to a second aspect of the present disclosure, there is provided a steam turbine unit including the steam turbine having a vibration damping structure as described above.

Through the technical scheme, before the steam turbine operation, can install damping structure on the axle bush lid earlier, promptly, insert damping structure at least partially and establish first threaded hole, first external screw thread and first screw hole threaded connection through forming in damping structure's surface, so that this damping structure is close to the one end of axle bush and supports the top on the axle bush, realize compressing tightly the axle bush, avoid or alleviate the too big problem of self-excited vibration of this axle bush, thereby promote the stability of this axle bush in the operation process, and then promote the stability of setting at the inboard bearing of this axle bush in the operation process, reduce the shut down maintenance number of times to the steam turbine, reach the purpose that promotes steam turbine efficiency.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a partial perspective view of a steam turbine having a damping structure provided in accordance with an exemplary embodiment of the present disclosure, wherein the damping structure is disposed through a first threaded aperture;

FIG. 2 is a schematic, partially cross-sectional view of a steam turbine having a damping structure according to an exemplary embodiment of the present disclosure, wherein the damping structure is inserted into the first threaded hole, and one end of the damping structure near the bearing shell abuts against the bearing shell;

FIG. 3 is a schematic, partially cross-sectional view of a steam turbine having a damping structure according to an exemplary embodiment of the present disclosure, wherein the damping structure according to another embodiment of the present disclosure is inserted into the first threaded hole, and one end of the damping structure near the bearing shell abuts against the bearing shell;

FIG. 4 is a schematic cross-sectional view of a damping structure of a steam turbine having a damping structure provided in an exemplary embodiment of the present disclosure;

fig. 5 is a schematic cross-sectional view illustrating a damping structure of a steam turbine having a damping structure according to another exemplary embodiment of the present disclosure.

Description of the reference numerals

10-a bearing; 20-bearing bush; 30-a bearing bush cover; 40-a vibration-damping structure; 41-a shock-absorbing rod; 411-rod body; 4110-polished rod section; 4111-a screw section; 412-a screw-on portion; 413-a screw section; 42-a second nut; 420-a screw section; 421-thread section; 43-a first external thread; 44-a second external thread; 45-butting portion.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, "inner and outer" refer to the inner and outer sides of the outline of the corresponding structure, and "distal and proximal" refer to the distance from the corresponding structure. The above directional terms are merely for convenience in describing the present disclosure, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be taken as limiting the present disclosure. In addition, it is to be understood that the terms "first," "second," and the like are used for distinguishing one element from another, and are not necessarily order nor importance.

Although the problem of bearing bush vibration is solved in China at present, the common problem of the technology is that a counterweight device needs to be installed on a steam turbine unit to be shut down, or the steam turbine unit is shut down to fix the bearing bush, or the gap and the height of each bearing bush are balanced, so that the defect is shown, namely the steam turbine unit needs to be shut down, the capital cost in the starting and stopping processes of the steam turbine unit is increased, the part of profits of power generation production is reduced in the shutdown period, the scheduled check is possibly carried out because the steam turbine unit is not shut down, the power generation efficiency of the steam turbine unit is greatly influenced, even if the loss is borne, the reliability of effective treatment of the turbine bearing vibration cannot be increased even if the steam turbine unit is shut down, the main reason is that the generation of the turbine bearing vibration is complex, the influence factors are multiple, and the problem is difficult and serious.

Based on this, referring to fig. 1 to 5, according to a first aspect of the present disclosure, there is provided a steam turbine having a damping structure, including a bearing 10, a bearing shell 20, a bearing shell cover 30 and a damping structure 40, wherein the bearing 10 is located inside the bearing shell 20, the bearing shell cover 30 covers outside the bearing shell 20, and the bearing shell cover 30 is provided with a first threaded hole; a first external thread 43 is formed on the outer surface of the damping structure 40, the damping structure 40 at least partially penetrates through the first threaded hole, the first external thread 43 is in threaded connection with the first threaded hole, and one end of the damping structure 40 close to the bearing bush 20 abuts against the bearing bush 20.

Through the technical scheme, before the steam turbine operation, can install damping structure 40 on bearing bush lid 30 earlier, namely, insert damping structure 40 at least partially and establish in first threaded hole, at first external screw thread 43 and the first screw hole threaded connection through forming in damping structure 40's surface, so that this damping structure 40 is close to the one end of axle bush 20 and supports and push against on axle bush 20, realize compressing tightly axle bush 20, avoid or alleviate the too big problem of self-excited vibration of this axle bush 20, thereby promote the stability of this axle bush 20 in the operation, and then promote the stability of setting at the inboard bearing 10 of this axle bush 20 in the operation, reduce the shut down maintenance number of times to the steam turbine, reach the mesh that promotes steam turbine efficiency.

In order to facilitate the installation of the vibration damping structure 40 into the first threaded hole by the operator, in an embodiment provided by the present disclosure, as shown in fig. 2 and 4, the vibration damping structure 40 may alternatively include a vibration damping rod, the vibration damping rod may include a rod body 411 and a screwing portion 412 formed on the rod body 411, the rod body 411 includes a polished rod section 4110 and a screw section 4111, the screw section 4111 is located between the polished rod section 4110 and the screwing portion 412, and the first external thread 43 is formed on an outer circumferential surface of the screw section 4111. Like this, at the in-process of installing damping structure 40, can insert polished rod section 4110 to the threaded hole earlier, until the first external screw thread 43 that forms on screw rod section 4111 contacts with the internal thread in the first threaded hole, at this moment, twist through the portion 412 of twisting that forms on the body of rod 411 and twist to realize the threaded connection between this threaded section 421 and the first threaded hole, it can to press on axle bush 20 until the one end that above-mentioned polished rod section 4110 is close to axle bush 20.

It should be noted that the shape of the screw part 412 is not limited in the present disclosure, for example, the screw part 412 may be formed in a handle shape so that the operator can screw the rod part directly through the screw part 412, or the screw part 412 may be formed in a polygonal nut-shaped structure so that the operator can screw the rod part through a tool such as a wrench.

Alternatively, as shown in fig. 2, 4, polished rod section 4110 has a length greater than that of screw section 4111. Because the polished rod is not provided with the screw thread, the surface is smooth relatively for being provided with the screw rod section 4111 of first external screw thread 43, like this, at the in-process of assembling above-mentioned damping structure 40, be convenient for polished rod section 4110 more and enter into first threaded hole, through the length that increases polished rod section 4110, reduce the contact between screw rod section 4111 and the first threaded hole to be convenient for more to this damping structure 40's assembly.

Alternatively, it is understood that the length of the threaded segment 421 should be as short as possible, provided that the threaded segment 421 meets the installation requirements.

During operation of the steam turbine, the bearing 10, the bearing shell 20 and the bearing shell cover 30 all generate certain vibration conditions, and in order to improve the stability of the fit between the damping structure 40 and the first threaded hole, optionally, in an embodiment provided by the present disclosure, the damping structure 40 may further include a first nut (not shown) that is threadedly connected to the first external thread 43 and abuts against a side of the bearing shell cover 30 facing away from the bearing shell 20. Through setting up first nut, and first nut is connected in first external screw thread 43 and supports and leans on the one side that deviates from axle bush 20 at axle bush lid 30, like this, first nut can play the effect of secondary fastening to damping structure 40 to avoid this damping structure 40 to take place the condition not hard up, smooth silk under long-time vibration state, the influence is to the effect of supporting of axle bush 20.

In another embodiment provided by the present disclosure, the stability of the engagement of the damping structure 40 with the first threaded hole may also be improved by welding, and specifically, after the damping structure 40 is screwed in place, the portion of the damping structure 40 protruding from the pad cover 30 may be welded to the pad cover 30, so as to avoid the situation that the damping structure 40 is loosened with respect to the pad cover 30.

The disclosure does not limit the specific structure and shape of the damping structure 40, for example, in another embodiment provided by the disclosure, as shown in fig. 3 and 5, the damping structure 40 may alternatively include a damping rod and a second nut 42, the damping rod includes a screw portion 413 and a screwing portion 412 formed on the screw portion 413, a second external thread 44 is formed on the outer circumferential surface of the screw portion 413, a second threaded hole is formed on the second nut 42, the second nut 42 is sleeved on the screw portion 413, and the second external thread is connected with the external thread; the second nut 42 includes a screw thread section 420 and a screw thread section 421, and a first external thread 43 is formed on an outer circumferential surface of the screw thread section 421. Thus, when the damping structure 40 is assembled, the second nut may be installed into the first threaded hole first, that is, the threaded section 421 of the second nut is screwed into the first threaded hole by the screwing section 420, and then the screw part 413 of the damping rod is screwed into the second threaded hole of the second nut 42 by the screwing part 412 of the damping rod until one end of the damping rod close to the axle bush 20 abuts against the axle bush 20. Moreover, by the above arrangement, in the process of adjusting the pressure applied to the bearing bush 20 by the damping rod, the second nut 42 and the first threaded hole are not required to be adjusted in cooperation, and only the damping rod screwed in the second threaded hole of the second nut 42 is required to be screwed, so that the problem that the first threaded hole is slippery and damaged due to repeated screwing of the damping structure 40 can be avoided, and even if the second threaded hole of the second nut 42 is damaged, the second nut 42 can be directly replaced without punching the bearing bush cover 30 or replacing the bearing bush cover 30.

Alternatively, as shown in fig. 3 and 5, the screw segment 420 has an abutting portion 45 protruding from the screw segment 421 in the radial direction of the second nut 42, and the abutting portion 45 abuts against a side of the bearing bush cover 30 facing away from the bearing bush 20. In this way, in the process of screwing the second nut 42, after the second nut 42 is screwed in place, the abutting portion 45 abuts against one side of the bearing bush cover 30 away from the bearing bush 20, at this time, the second nut 42 cannot be screwed continuously, that is, at this time, the second nut 42 and the bearing bush cover 30 are kept in a relatively fixed state, so that the situation that the second nut 42 rotates along with the damping rod in the subsequent process of screwing the damping rod into the second threaded hole can be avoided, and the damping rod can be adjusted more conveniently.

Optionally, the damping structure 40 is provided with a mark line, and the mark line is located in the first threaded hole when one end of the damping structure 40 close to the bearing shell 20 abuts against the bearing shell 20. Specifically, before screwing the vibration damping structure 40, the length of the vibration damping structure 40 to be inserted into the first threaded hole may be calculated in advance according to the distance between the bearing bush cover 30 and the bearing bush 20, and then the identification line is marked at the corresponding position of the vibration damping structure 40, so that when the identification line on the vibration damping structure 40 enters the first threaded hole during screwing the vibration damping structure 40, the identification line represents that the vibration damping structure 40 has been screwed to a proper abutting position, and the problem that the bearing bush 20 cannot be pressed due to too small pressure applied to the bearing bush 20 by the vibration damping structure 40 or the bearing bush 20 is damaged due to too large pressure applied to the bearing bush 20 by the vibration damping structure 40 is avoided.

In order to further enhance the vibration damping effect of the vibration damping structure 40 on the bearing shell 20, optionally, in an exemplary embodiment provided by the present disclosure, as shown in fig. 1, the number of the first threaded holes may be two, two first threaded holes are symmetrically arranged about the longitudinal center line of the bearing shell cover 30, and the vibration damping structure 40 is threadedly connected in each first threaded hole. The two first threaded holes are symmetrical about the longitudinal center line of the bearing bush cover 30, so that when the damping structures 40 are installed in the corresponding first threaded holes, the two damping structures 40 can apply pressure to the bearing bush 20 from different positions, the contact area between the two damping structures and the bearing bush 20 is increased, the bearing bush 20 can be stressed more uniformly, and the stability of the bearing bush 20 can be further improved.

In order to further increase the pressing effect of the damping structure 40 on the bearing shell 20, in an embodiment provided by the present disclosure, the end surface of the damping structure 40 close to the bearing shell 20 may be a straight surface. The end surface of the damping structure 40 is formed as a flat surface, and a contact area between the damping structure and the bearing shell 20 can be increased in a process of pressing the bearing shell 20, so that stability of the bearing shell 20 is improved.

In another embodiment provided by the present disclosure, a groove may be formed on an end surface of the damping structure 40 close to the bearing shell 20, so that an edge of the groove can contact with the bearing shell 20 during the process of pressing the bearing shell 20, thereby increasing a contact surface with the bearing shell 20 and reducing the requirement for machining accuracy of the end surface of the damping structure 40.

According to a second aspect of the present disclosure, there is provided a steam turbine unit including the steam turbine having the vibration damping structure as above. The steam turbine set has all the technical characteristics of the steam turbine with the vibration reduction structure, and the details of the disclosure are not repeated.

The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A steam turbine with a vibration damping structure is characterized by comprising a bearing, a bearing bush cover and the vibration damping structure, wherein the bearing is positioned on the inner side of the bearing bush, the bearing bush cover is arranged on the outer side of the bearing bush, and a first threaded hole is formed in the bearing bush cover;

a first external thread is formed on the outer surface of the vibration reduction structure, the vibration reduction structure at least partially penetrates through the first threaded hole, the first external thread is in threaded connection with the first threaded hole, and one end, close to the bearing bush, of the vibration reduction structure abuts against the bearing bush.

2. The steam turbine having a vibration damping structure according to claim 1, wherein the vibration damping structure includes a vibration damping rod including a rod body and a screw portion formed on the rod body, the rod body includes a polished rod section and a screw section, the screw section is located between the polished rod section and the screw portion, and the first external thread is formed on an outer circumferential surface of the screw section.

3. The steam turbine having a vibration damping structure according to claim 2, wherein the length of the polished rod section is greater than the length of the screw section.

4. The steam turbine having a damping structure according to claim 2, further comprising a first nut, wherein the first nut is screwed to the first external thread, and wherein the first nut abuts against a side of the bearing shell cover facing away from the bearing shell.

5. The steam turbine having a vibration damping structure according to claim 1, wherein the vibration damping structure includes a vibration damping rod and a second nut, the vibration damping rod includes a screw portion and a screw portion formed on the screw portion, a second external thread is formed on an outer circumferential surface of the screw portion, a second threaded hole is formed on the second nut, the second nut is fitted around the screw portion, and the second external thread hole is connected to the external thread;

the second nut comprises a screwing section and a thread section, and the first external thread is formed on the outer peripheral surface of the thread section.

6. The steam turbine according to claim 5, wherein the screw segment has an abutting portion that protrudes from the screw segment in a radial direction of the second nut, and abuts against a side of the bearing shell cover that faces away from the bearing shell.

7. The steam turbine according to any of claims 1 to 6, wherein the damping structure is provided with a marking, and the marking is located in the first threaded hole when one end of the damping structure close to the bearing shell abuts against the bearing shell.

8. The steam turbine having a vibration damping structure according to any one of claims 1 to 6, wherein the number of the first threaded holes is two, two of the first threaded holes are symmetrically provided about a longitudinal center line of the shoe cover, and the vibration damping structure is threadedly connected in each of the first threaded holes.

9. The steam turbine according to any of claims 1 to 6, wherein the end surface of the damping structure adjacent to the bearing shell is a flat surface.

10. A steam turbine plant, characterized by comprising a steam turbine having a vibration damping structure according to any one of claims 1 to 9.

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